CN1717605A - Optical fiber ribbon and optical fiber cable using the same - Google Patents
Optical fiber ribbon and optical fiber cable using the same Download PDFInfo
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- CN1717605A CN1717605A CN 200380104221 CN200380104221A CN1717605A CN 1717605 A CN1717605 A CN 1717605A CN 200380104221 CN200380104221 CN 200380104221 CN 200380104221 A CN200380104221 A CN 200380104221A CN 1717605 A CN1717605 A CN 1717605A
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
A plurality of optical fibers are arranged in parallel and peripheries of the plurality of these optical fibers are integrally formed using a sheath. Here, the sheath is formed over the entire length of optical fiber ribbons and a flat portion of the sheath is formed substantially parallel to a common tangent of the neighboring optical fibers. A maximum value of a thickness of the optical fiber ribbons is set to a value which is larger than an outer diameter of the optical fibers by 40 mu m or less. Due to such a constitution, it is possible to easily branch the optical fibers from the integrally formed optical fiber ribbons.
Description
Technical field
The present invention relates to the optical cable of fibre ribbon and use fibre ribbon.
Background technology
For by making multifiber be integrated into the fibre ribbon that band shape forms, for example can be listed below.
In uncensored Jap.P. publication Sho.61 (1986)-73112, a kind of banded optical unit 1105 is disclosed, wherein, as shown in figure 39, banded optical unit 1105 is configured to: the many coating optic fibres 1103 that are arranged in parallel are to form the optical fibre set zoarium, wherein, every coating optic fibre 1103 comprises the overlay 1102 of wound fiber 1101, and overlay 1102 is made by ultraviolet curable resin; And the protective seam of being made by ultraviolet curable resin 1104 forms with state integral body on the optical fibre set zoarium that protective seam 1104 does not adhere on the overlay 1102.This banded optical unit 1105 is characterised in that: the external diameter of supposing coating optic fibre 1103 is X, the quantity that forms the coating optic fibre 1103 of optical fibre set zoarium is n, the thickness and the width of banded optical unit 1105 are H and L, concern 1.1≤H/X≤1.45,1.0＜L/nx≤1.08 below setting up.
In uncensored Japanese Utility Model publication Hei.4 (1992)-75304, shown in Figure 40 A and Figure 40 B, in fibre ribbon, on the outermost of every coating optic fibre, form color layer, and outside coating optic fibre whole, place and form whole overlay.Coating optic fibre 1201 is included in the optical fiber 1202 at its center, and, the periphery that first overlay of being made by ultraviolet curing resin 1203 and second overlay 1204 are coated in optical fiber 1202 successively, and further, on around second overlay 1204, form color layer 1205 by applying the colored ink of making by ultraviolet curable resin.Many (be generally 4n (n is 2,3 ...) root, be 8 in this embodiment) optical fiber 1202 is arranged in parallel with a row.Between each coating optic fibre 1201 that is arranged in parallel, fill whole overlay 1206 in the determined gap, so that coating optic fibre 1201 becomes integral body, and, whole overlay 1206 is for example made by being coated to the coating optic fibre 1201 outer ultraviolet curable resins of placing, and thickness h=10 μ m or littler.Figure 40 A is the planimetric map of above-mentioned fibre ribbon.Clear illustrating peeled off whole overlay 1206 in a longitudinal direction off and in Figure 40 A, thereby, form the part 1207 at intermittence that does not have overlay and expose coating optic fibre 1201.That is to say, alternately arrange to keep overlay 1206 coating part 1208 and above-mentioned intermittence layer.Figure 40 B illustrates the xsect of the part that constitutes above-mentioned coating part 1208.
Further, in uncensored Jap.P. publication Sho.63 (1985)-13008, as shown in figure 41, in fibre ribbon 2100, coating optic fibre 2101 is made of glass fibre 2101a and primary coating layers (cushion) 2101b, wherein, glass fibre 2101a constitutes the nuclear core, and primary coating layers 2101b places formation at glass fibre 2101a outer.As the belt many coating optic fibres 2101 that are arranged in parallel, and, on the length direction of belt, form resin adhesion section 2102 with fixed intervals.For example, resin adhesion section 2102 is formed by the ultraviolet curable resin such as Epocryl, PBAA ester resin, silicone acrylate resin.
Further, in USP4147407, as shown in figure 42, fibre ribbon 2110 forms: the duplex coating that is made of main coating 2112 and assistant coating 2113 is coated to the outside of every glass fibre 2111, thereby forms optical fiber 2114.Tie up many such optical fiber 2114, and, melt the assistant coating 2113 that was once solidifying with solvent, thereby form public coating by mutual fusing.
Further, in accepted Jap.P. publication Sho.63 (1988)-2085, as shown in figure 43, fibre ribbon 2120 is constructed optical fiber 2123 by form coating 2122 on the outside of glass fibre 2121, and vertically connects rove as reinforcing glass fiber 2124 on the both sides of optical fiber 2123.Then, obtain banded entangled object 2126 by weaving these as the reinforcing glass fiber 2124 of warp with as the glass fibre 2125 of parallel, and entangled object 2126 is injected into thermosetting resin 2127, and is set at semi-cured state.In the case, be connected to reinforcing glass fiber 2124 on optical fiber 2123 both sides by the glass fibre 2125 that constitutes parallel and fastening as the optical fiber 2123 of warp.
In recent years, along with the requirement to optical communication system increases day by day, generally use conduit, mast to wait the optical cable of installing and using above-mentioned fibre ribbon, wherein, fibre ribbon constitutes optical transmission path.
Generally speaking, for the optical cable that is installed in communication trunk such as conduit and the mast, generally used trough of belt type optical cable (for example referring to the composite catalog of fiber cable network wiring system, SumitomoDenki Kogyo, Co., Ltd.2002 issues August, the 9th page).
Figure 44 illustrates the example of the trough of belt type optical cable of correlation technique.
As shown in figure 44, in the trough of belt type optical cable 3050 of correlation technique, have tensile strength body 3051, in spacer 3052, hold a plurality of fibre ribbons 3060 in the formed groove 3053 at the center of spacer 3052.Optical cable 3050 is 100 core pattern optical cables, and is wherein, stacked and hold five 4-fiber optic bands 3060 in each of five grooves 3053.Further, each groove 3053 is in they direction spiralizations in state lower edge of layout parallel to each other along the longitudinal.Replacedly, also have n optical cable, wherein, each groove 3053 keeps their states of layout parallel to each other in the vertical simultaneously in a circumferential direction to replace reverse mode spiralization.Usually, wherein the spacer along the grooving of a direction spirality is called unidirectional distortion spacer, and is called the SZ spacer with the spacer of alternately reverse manner spirality grooving.
Further, come off from groove 3053, around spacer 3052, twine pressure coil 3054 for preventing fibre ribbon 3060, simultaneously, at the outer side covers plastic sheath 3055 of pressure coil 3054.
Tensile strength body 3051 is for preventing that tensile strength is directly delivered to the tensile strength body that fibre ribbon 3060 is provided with when tensile strength affacts on the optical cable 3050, and, for example use steel wire as the tensile strength body.
Fibre ribbon 3060 is arranged as: the optical fiber of the 4 external diameter 250 μ m that are arranged in parallel is so that they contact with each other, and all optical fiber cover and form band shape with ultraviolet curable resin.For the profile of fibre ribbon 3060, for example, its thickness is about 0.3mm-0.4mm, and its width is about 1.1mm.5 fibre ribbons 3060 that are contained in the groove 3053 are stacked with mutually tight state of contact.
Further, for another configuration that is installed in the optical cable in communication trunk such as conduit, the mast etc., receiving optical fiber band in the tubular elongate body.For example, for loose thimble tube optical cable, open following optical cable (referring to the proceeding of the 51st IWCS (international electric wire forum), 22-25 page or leaf).
As shown in figure 45,6 12-fiber optic bands 4102 and being contained in the sleeve pipe 4103 interweave, and 4 such sleeve pipes 4103 twist around center tensile strength body 4104 together to replace reverse mode in a longitudinal direction, add upper jacket 4105 on these sleeve pipes 4103.Wherein, every fibre ribbon 4102 all comprises 12-fiber optic 4101 jointly.
Although do not describe the detailed structure of 12-fiber optic band 4102 in detail,, usually, the coating optic fibre of the external diameter 250 μ m that are arranged in parallel, and all coating optic fibres cover with ultraviolet curable resin.Thereby with band shape formation fibre ribbon.For the physical dimension of shoestring, for example, its thickness is about 0.3mm-0.4mm, and its width is about 3.1mm.
For the optical cable that is used for such as application such as FTTH (Fiber to the home), can enumerate from overhead wiring cable distribute and the lead-in cable of introducing each root or multifiber (for example, the composite catalog of fiber cable network wiring system, Sumitomo Denki Kogyo, Co., Ltd.2002 issues August, the 13rd page).Optical cable example as lead-in cable shown in Figure 46.
As shown in figure 46, correlation technique optical cable 5100 is configured to make componentry 5107 to be connected by neck part 5105 with cable messenger part 5108.
In componentry 5107, optical fiber 5101 and two sheath 5103 coverings that tensile strength body 5102 usefulness are made by thermoplastic resin.Form optical fiber 5101 by the periphery with ultraviolet curable resin cover glass fiber, wherein, the external diameter of optical fiber 5101 for example is 250 μ m.For tensile strength body 5102, use the linear body of making by steel or fibre reinforced plastics (FRP), wherein, form the cross-sectional profiles of tensile strength body 5102 with circle.By with common optical fiber 5101 and the tensile strength bodies 5102 of covering of sheath 5103, be added to external force on the optical cable 5100 such as pulling force etc. and bear, so that protection optical fiber 5101 is not subjected to the external force effect by tensile strength body 5102.
Further, in the periphery of componentry 5107, form two notches 5104, so that notch 5104 is towards optical fiber 5101.It is in order to make taking-up optical fiber 5101 easy, wherein, when taking out optical fiber 5101, to form otch in the part between two notches 5104 of sheath 5103, and tear these parts that notch 5104 is set.
Cable messenger part 5108 is configured to have the intensity that supports overhead optical cable 5100, and forms cable messenger part 5108 by covering the Support Level of being made by steel, FRP etc. 5106 with sheath 5103.
Further, use the resin identical, with componentry 5107 and cable messenger part 5108 whole formation neck parts 5105 with the used sheath of componentry 5107 and cable messenger part 5,108 5103.
Although the optical cable 5100 that has an optical fiber 5104 this illustrate, but in the lead-in cable of correlation technique, the lead-in cable that has two optical fiber that are arranged in parallel, perhaps, as shown in figure 47, there is the lead-in cable that comprises fibre ribbon 5101a, wherein, produces fibre ribbon 5101a by making multifiber form band shape.
The fibre ribbon 5101a that is arranged in parallel and forms correlation technique with the state that contacts with each other by the optical fiber that makes 4 external diameter 250 μ m, and, whole optical fiber covered with ultraviolet curable resin with band shape.The physical dimension of fibre ribbon is: its thickness is about 0.3mm-0.4mm, and its width is about 1.1mm.
Here, at the above-mentioned optical cable in the communication trunk of being installed in shown in Figure 44 and Figure 45, for from cell base station to fibres of giving out light such as subscriber's side buildingss, such situation is arranged, wherein, pull out the fibre ribbon that holds, and any optical fiber of pulling out in the fibre ribbon is connected with the optical fiber of subscriber's side.
In correlation technique trough of belt type optical cable shown in Figure 44, at first, peel off the sheath and the pressure coil of certain-length from the arbitrary portion of installation optical cable, subsequently, from groove, pull out the fibre ribbon of hope.Then, from the fibre ribbon of pulling out, tell the optical fiber of appointment, and be connected to the optical fiber of subscriber's side.
Further,, at first, peel off the sheath of certain-length, pull out the sleeve pipe of hope from the arbitrary portion of installation optical cable for correlation technique shown in Figure 45 pine thimble tube optical cable, subsequently, except that the coating of Decanning, so that pull out the fibre ribbon of hope.Then, from the fibre ribbon of pulling out, tell the optical fiber of appointment, and be connected to the optical fiber of subscriber's side.
Further, for optical cable shown in Figure 46 5100, when optical cable 5100 from the overhead dwelling house that is incorporated into when inner, it is unnecessary that the cable messenger part 5108 that is used to support overhead optical cable becomes, thereby, tear neck part 5105, so that separate elements part 5107 and cable messenger part 5108.Then, the optical cable that only is made of componentry 5107 connects up at premises.
For optical cable 5100a shown in Figure 47, after premises is to optical cable 5100 wiring, take out coating optic fibre band 5101a, and any optical fiber among the fibre ribbon 5101a of taking out is connected to the optical fiber of subscriber's side.
In the case, at first, tear sheath 5103, so that take out fibre ribbon 5101a at the arbitrary portion of wiring optical cable 5100a.Then, from the fibre ribbon 5101a that takes out, tell the optical fiber of hope, and be connected to the optical fiber of subscriber's side.
Because the optical cable of wiring comprises the optical fiber of transmitting optical signal, therefore, requirement is suppressing to tell the operation (so-called charged branch operation) that is not used as the optical fiber of transmission path from the center section of fibre ribbon when transmission quality descends, wherein, in described fibre ribbon, a part of optical fiber is as transmission path.Correspondingly, when telling desirable optical fiber, more and more need a kind of branching method that is called intermediate column branch, in the method, the cutting optical fibre band just can not told desirable optical fiber from the center section of taking-up fibre ribbon.
Yet, for the fibre ribbon in being contained in the correlation technique optical cable, be difficult to remove the resin that covers multifiber, and particularly, under existing situation, be difficult to by in multifiber, selecting an optical fiber to carry out intermediate column branch.
For example, when attempting to use sand paper or scraping off resin, might damage or cut off optical fiber such as the instrument of planer.
In the case, in correlation technique, can not carry out intermediate column branch, thereby for telling desirable optical fiber, cutting integral body forms whole multifibers of fibre ribbon, and tells simple optical fiber from the cutting part of fibre ribbon subsequently.Correspondingly, can not be under user mode (being electriferous state) carry out charged branch operation to comprising as the fibre ribbon of the optical fiber of transmission path.
Further, when the cutting optical fibre band, except the optical fiber that also connects at cutting part, other optical fiber can not be used as transmission path, thereby, increase the cost of constructing optical communication networks.
Further, recently, in information communication, needed the high speed signal of long Distance Transmission high data density day by day, and, required to reduce the polarisation mode dispersion (PMD) of optical fiber, wherein, PMD is the factor of the long Distance Transmission of restriction.Yet, shown in Figure 45 in sleeve pipe in the optical cable of receiving optical fiber band, fibre ribbon twists in sleeve pipe, and further, sleeve pipe is around the tensile strength body distortion at center, thereby fibre ribbon is out of shape in sleeve pipe, thereby cause following defective:, thereby increase PMD because of optical fiber produces birefringence from the stress that resin receives.
Summary of the invention
Correspondingly, the purpose of this invention is to provide a kind of like this fibre ribbon, wherein, form fibre ribbon by making multifiber become integral body safely, in the fiber optic tap operation, tell optical fiber easily, and, the increase of fiber transmission attenuation when carrying out charged branch, suppressed.
Another object of the present invention provides a kind ofly can carry out the optical cable of intermediate column branch to the fibre ribbon that is contained in the optical cable.
Another purpose of the present invention provides a kind of like this optical cable, wherein, easily the fibre ribbon that is contained in the optical cable is realized intermediate column branch, and reduces PMD simultaneously.
In order to realize above purpose, adopt following means.According to the present invention, a kind of fibre ribbon is provided, comprising:
The multifiber that is arranged in parallel; And
Make multifiber become whole resin on whole length of optical fiber, optical fiber and resin are in the state of optical fiber and the mutual tight adhesion of resin,
Wherein, the maximum thickness of supposing fibre ribbon is that the external diameter of T (μ m) and optical fiber is d (μ m), opening relationships T≤d+40 (μ m).
In having the fibre ribbon of this structure, when making optical cable or installation work, sheath does not separate with optical fiber, because the mutual tight adhesion of optical fiber and sheath.Further, when need be,, in sheath, produce the crack, peel off sheath because sheath is thinner from the part branch optical fiber except the end of fibre ribbon, thereby, easily to fiber optic tap.And then, when during as the fibre ribbon branch untapped optical fiber of transmission path (so-called charged branch operation), suppressing the increase of fiber transmission attenuation from the some of them optical fiber installed.
In fibre ribbon, preferably, make multifiber become integral body by the entire circumference that covers the multifiber that is in the state of being arranged in parallel with resin.
Further, recess correspondingly forms recessed portion in resin and between the adjacent fiber.
According to fibre ribbon, for example, when making optical cable or installation work, in sheath, do not produce the crack, thereby optical fiber integrates reliably, and optical fiber does not separate with this structure.Further,, peel off sheath from the recessed portion of sheath easily when needs during from the fibre ribbon branch optical fiber, and thereby can be to fiber optic tap.Further, when charged branch operation, can suppress the increase of fiber transmission attenuation.
In order to realize above purpose, fibre ribbon according to the present invention comprises:
The multifiber that under the state that optical fiber contacts with each other, is arranged in parallel; And
Make multifiber become whole resin by the entire circumference that covers multifiber,
Wherein, form resin on whole length of fibre ribbon, simultaneously, be arranged in the common tangent that resin in the recessed portion is no more than adjacent fiber, wherein, recessed portion forms between adjacent fiber.
According to the fibre ribbon with this structure, owing to cover the common tangent that the recessed portion of the sheath of recess between the optical fiber is no more than adjacent fiber, therefore, according to the shape of recess between the optical fiber, the recessed portion of sheath becomes darker.Because sheath can be made thinlyyer at the thickness of recess office, therefore, peels off sheath easily, thereby, when optical fiber is carried out branch, but branch optical fiber.
Further, in order to realize above purpose, optical cable according to the present invention has one or more fibre ribbon, and described fibre ribbon comprises: the multifiber that is arranged in parallel; And on whole length of optical fiber, make multifiber become whole resin, optical fiber and resin are in the state of optical fiber and the mutual tight adhesion of resin,
Wherein, the maximum thickness of supposing fibre ribbon is that the external diameter of T (μ m) and optical fiber is d (μ m), opening relationships T≤d+40 (μ m).
Fibre ribbon can be configured to: make multifiber become integral body by the entire circumference that covers the multifiber that is in the state of being arranged in parallel with resin.Further, recess correspondingly forms recessed portion in the resin of fibre ribbon and between the adjacent fiber.
According to optical cable with this structure, compare with correlation technique thickness, it is thinner to make multifiber become the thickness of whole resin, thereby carries out the intermediate column branch operation easily.Thereby, can from optical cable, take out and be connected the optical fiber of not carrying out intermediate column branch in the fibre ribbon in other parts, thereby might effectively utilize the multifiber that is contained in the optical cable.
Above-mentioned optical cable further comprises spacer, wherein, described spacer have be roughly columniform plastics prolate body and therein pericardium draw together the tensile strength body,
Wherein, on the peripheral surface of prolate body, form the roughly groove of spirality, and, in the groove inner stacks and hold one or more fibre ribbon.
Further, above-mentioned optical cable further comprises:
Be roughly columniform extension tubing, in extension tubing, hold one or more fibre ribbon with overlapped way.
Above-mentioned optical cable also further comprises:
Be used to cover the sheath of one or more fibre ribbon.
And then in order to realize above purpose, optical cable according to the present invention has one or more fibre ribbon, and described fibre ribbon comprises: the multifiber that is arranged in parallel under the state that optical fiber contacts with each other; And make multifiber become whole resin by the entire circumference that covers multifiber,
Wherein, form resin on whole length of fibre ribbon, simultaneously, be arranged in the common tangent that resin in the recessed portion is no more than adjacent fiber, wherein, recessed portion forms between adjacent fiber.
According to optical cable with this structure, compare with correlation technique thickness, it is thinner to make multifiber become the thickness of whole resin, thereby carries out the intermediate column branch operation easily.Thereby, can from optical cable, take out and be connected the optical fiber of not carrying out intermediate column branch in the fibre ribbon in other parts, thereby might effectively utilize the multifiber that is contained in the optical cable.
Description of drawings
Figure 1A is the viewgraph of cross-section according to the fibre ribbon of first embodiment of the invention;
Figure 1B is the skeleton view according to the fibre ribbon of first embodiment of the invention;
Fig. 2 A-2C is the synoptic diagram that illustrates according to the branching method of the fibre ribbon of first embodiment of the invention;
Fig. 3 is the viewgraph of cross-section that the state that each optical fiber unshapeliness of fibre ribbon arranges is shown;
Fig. 4 is sheath and the Young modulus of optical fiber and the key diagram of cross-sectional area that is used to explain fibre ribbon;
Fig. 5 is the key diagram that is used to explain the method for adhesion strength between measuring optical fiber and the sheath;
Fig. 6 is the key diagram that is used to explain the method for adhesion strength between measuring optical fiber and the sheath;
Fig. 7 is the key diagram that illustrates according to the manufacture method of the fibre ribbon of first embodiment of the invention;
Fig. 8 is the viewgraph of cross-section of nozzle;
Fig. 9 is the viewgraph of cross-section of mould;
Figure 10 is the viewgraph of cross-section according to another fibre ribbon of first embodiment of the invention;
Figure 11 A is the viewgraph of cross-section according to the fibre ribbon of second embodiment of the invention;
Figure 11 B is the skeleton view according to the fibre ribbon of second embodiment of the invention;
Figure 12 A-12C illustrates the synoptic diagram according to the branching method of the fibre ribbon of second embodiment of the invention;
Figure 13 A is the viewgraph of cross-section according to another fibre ribbon of second embodiment of the invention;
Figure 13 B is the skeleton view according to another fibre ribbon of second embodiment of the invention;
Figure 14 is the viewgraph of cross-section according to another fibre ribbon that is in deflected condition of second embodiment of the invention;
Figure 15 is the key diagram that illustrates according to the manufacture method of the fibre ribbon of second embodiment of the invention;
Figure 16 is the viewgraph of cross-section of nozzle;
Figure 17 is the viewgraph of cross-section of mould;
Figure 18 is the key diagram that illustrates according to the manufacture method of another fibre ribbon of second embodiment of the invention;
Figure 19 is the viewgraph of cross-section of mould;
Figure 20 is the viewgraph of cross-section according to the optical cable of first embodiment of the invention;
Figure 21 A and 21B are the synoptic diagram that the intermediate column branch testing method of fibre ribbon is shown;
Figure 22 is the synoptic diagram that the discrete testing method of fibre ribbon is shown;
Figure 23 illustrates the synoptic diagram of the fibre ribbon of optical cable being carried out the method for intermediate column branch operation test;
Figure 24 is the viewgraph of cross-section that illustrates according to another optical cable of first embodiment of the invention;
Figure 25 illustrates the viewgraph of cross-section that is contained in the fibre ribbon in the optical cable shown in Figure 24;
Figure 26 A is the viewgraph of cross-section that illustrates according to the optical cable of second embodiment of the invention;
The side view that Figure 26 B is an optical cable shown in Figure 26 A under the state that optical cable covers without sheath and pressure coil;
Figure 27 A is the viewgraph of cross-section according to another optical cable of second embodiment of the invention;
Figure 27 B is the viewgraph of cross-section of the fibre ribbon of optical cable shown in Figure 27 A;
Figure 28 is the viewgraph of cross-section according to another optical cable of second embodiment of the invention;
Figure 29 is the viewgraph of cross-section according to the optical cable of third embodiment of the invention;
Figure 30 A and 30B are the synoptic diagram that the intermediate column branch testing method of fibre ribbon in the optical cable is shown;
Figure 31 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 32 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 33 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 34 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 35 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 36 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 37 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 38 is the viewgraph of cross-section according to another optical cable of third embodiment of the invention;
Figure 39 is for being illustrated in the viewgraph of cross-section of the correlation technique fibre ribbon of describing among the uncensored Jap.P. publication Sho.61 (1986)-73112;
Figure 40 is for being illustrated in the viewgraph of cross-section of the correlation technique fibre ribbon of describing among the uncensored Japanese Utility Model publication Hei.4 (1992)-75304;
Figure 41 is for being illustrated in the viewgraph of cross-section of the correlation technique fibre ribbon of describing among the uncensored Jap.P. publication Sho.63 (1985)-13008;
Figure 42 is the viewgraph of cross-section that is illustrated in the correlation technique fibre ribbon of describing among the USP4147407;
Figure 43 is the viewgraph of cross-section that is illustrated in the correlation technique fibre ribbon of describing among the Jap.P. publication Sho.63 (1988)-2085 that has accepted;
Figure 44 is the viewgraph of cross-section of the example of correlation technique optical cable.
Figure 45 is the viewgraph of cross-section of the example of correlation technique optical cable.
Figure 46 is the viewgraph of cross-section of the example of correlation technique optical cable.
Figure 47 is the viewgraph of cross-section of the example of correlation technique optical cable.
Embodiment
Below in conjunction with detailed embodiment, fibre ribbon manufacture method and the optical cable of explaining according to fibre ribbon of the present invention of accompanying drawing.
Figure 1A is the viewgraph of cross-section that illustrates according to fibre ribbon first embodiment of the present invention, and Figure 1B is the skeleton view of fibre ribbon.By many (in this embodiment, for example the being 4) optical fiber 11 that are arranged in parallel, and by place outside the optical fiber 11 that is arranged in parallel at these whole and on whole length of optical fiber 11 coating sheath 12, and form fibre ribbon 10.Sheath 12 closely adheres on the optical fiber 11.
In fibre ribbon according to the present invention, shown in Figure 1A, optical fiber contacts with each other.Here, " contacting with each other " comprises following situation: have the interval that is equal to or less than 10 μ m between the adjacent fiber of fibre ribbon, as foozle.When the optical fiber that comprises in the fibre ribbon contacts with each other, the easy branch of fibre ribbon.Even when optical fiber does not contact mutually, as long as the interval between the adjacent fiber of fibre ribbon is equal to or less than 10 μ m, formation sheath and the amount of resin of clamp-oning between the optical fiber are just less, thereby, carry out branch easily.Optical fiber 11 is made of glass fibre 13, protective finish 14 and color layer, and wherein, glass fibre 13 is formed the periphery of protective finish 14 cover glass fibers 13, and the periphery 15 of color layer covering protection coating 14 by nuclear core 13a and covering 13b.Further, peripheral 15 can constitute the auxiliary protection film, and form the color layer that thickness is approximately 1 μ m-10 μ m on peripheral 15.Further, on around the glass fibre 13, form the film like carbon-coating by coating.Here, preferred fiber 11 meets the G652 of regulation in ITU-T (International Telecommunications Union (ITU)-telecommunication standardization sector).
In this fibre ribbon 10, at the periphery of 4 optical fiber 11 that are arranged in parallel coating ultraviolet curable resin, as sheath 12.For the material of sheath 12, except ultraviolet curable resin, can use thermoplastic resin, thermosetting resin etc.
The sheath 12 that covers optical fiber 11 is formed by straight portion 18, and in the zone that optical fiber 11,11 is arranged in parallel, straight portion 18 is parallel with the common tangent S2 that optical fiber 11,11 forms basically.When the wall thickness t of the sheath 12 of fibre ribbon 10 makes hour, even by using mould 27 shown in Figure 9 on optical fiber 11, to apply the resin that is used to form sheath 12 when forming sheath 12, following situation is also arranged: on the sheath 12 of fibre ribbon 10, produce small recess, thereby sheath 12 is consistent with the profile of optical fiber 11.Straight portion 18 according to the present invention comprises this situation.When from fibre ribbon 10 branch optical fibers 11, by the sheath 12 that operator's manual operations or use separating tool are peeled off straight portion 18, easy branch optical fiber 11.For fibre ribbon according to the present invention, the viewpoint that loss increases when realizing favourable branch's operability and suppress charged branch has confirmed that the thickness of the sheath of fibre ribbon has had some influences.
Table 1 illustrates the relation between optical fiber outside diameter d, fibre ribbon maximum ga(u)ge T and the jacket thickness t.This table is used to assess branch's character of fibre ribbon, loose coiling PMD and optical cable PMD.Here, jacket thickness t is the wall thickness of the sheath outside the common tangent S2 of each optical fiber of fibre ribbon.
[table 1]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness (μ m) | Branch's character | Pine coiling PMD | Optical cable PMD |
| 250 | 290 | 20 | All right | All right | All right |
| 250 | 280 | 15 | Good | All right | All right |
| 250 | 270 | 10 | Good | Good | Good |
| 250 | 260 | 5 | Good | Good | Good |
In table 1, as shown in Figure 1, fibre diameter refers to the outside diameter d of optical fiber 11, and tape thickness refers to the maximum ga(u)ge T of fibre ribbon 10, and jacket thickness is the length t between the straight portion 18 of the common tangent S2 of optical fiber 11 and sheath 12.The optical fiber external diameter of fibre ribbon shown in the table 1 is 250 μ m.
Branch's character shown in the table 1 is illustrated in and suppresses that loss increases to 1.0dB or the easy degree of branch when the center section of fibre ribbon is branched off into each optical fiber littler the time." good " expression can surpass 2 minutes and carry out branch in time within 3 minutes, and " all right " be then represented and can carry out branch above in 3 minutes and time within 5 minutes.When branch's character be evaluated as " good " or " all right " time, the loss increase during branch is equal to or less than 1.0dB, thereby, can carry out charged branch.
Fibre ribbon shown in the table 1 shows the relation of T≤d+40 (μ m), thereby all fibre ribbons show the branch's character that is better than " all right ", wherein, loss increase during by setting branch is equal to or less than 1.0dB, can carry out intermediate column branch within 5 minutes.That is to say, can within 5 minutes, carry out charged branch.For the correlation technique fibre ribbon, the loss during branch increases above 1.0dB, perhaps, even separable optical fiber, but the correlation technique fibre ribbon also requires to surpass 5 minutes preset time, thereby, consider from real viewpoint, can not carry out charged branch.According to the fibre ribbon shown in the table 1, as long as tape thickness is equal to or less than 280 μ m, charged branch just can be carried out in promptly satisfied T≤+ 30 (μ m) that concern in 3 minutes.
For above-mentioned charged branch, explain an example of branching method.Shown in Fig. 2 A, fibre ribbon 10 is clipped between the upper shell 61 and lower house 62 of branch's instrument 60, wherein, makes the wire rod 63 that forms in the upright mode straight portion 18 near the sheath 12 of fibre ribbon 10 on these upper and lower casings 61,62.Fig. 2 B illustrates the xsect of this structure.Further, by branch's instrument 60 is pressed to fibre ribbon 10, shown in Fig. 2 C, wire rod 63 deflections, and the sharp angle of the end of deflection wire rod 63 contacts strongly with the straight portion 18 of the sheath 12 of fibre ribbon 10.
By being gone up at the longitudinal direction (the left and right direction among Fig. 2 C) of fibre ribbon 10, moves by branch's instrument 60 relative to fibre ribbon 10, promptly, by the fibre ribbons 10 that rub with branch's instrument 60, on straight portion 18, form crackle, perhaps use the terminal released part sheath of wire rod 63, thereby, make optical fiber 11 branches.In removable branch instrument 60 and the fibre ribbon 10 any or all.Wire rod 63 is resilient, thereby, when wire rod 63 is pressed to the straight portion of fibre ribbon, wire rod 63 deflections, and the angle part of the end of wire rod 63 contacts with straight portion 18.By mobile branch instrument 60 or fibre ribbon 10 under this state, wire rod 63 (flexible part) cracks on straight portion 18, or peels off straight portion 18.
By using branch's instrument 60 fibre ribbon 10 that repeats to rub, peel off the interface between the sheath 12 of the color layer 15 of optical fiber 11 and straight portion 18.When further repeating to rub, scrape off straight portion 18 on optical fiber 11 central shafts or under part, and produce the crack, subsequently, concentrate and crackle that development forms in straight portion 18 by pressure, thereby, peel off straight portion 18.In this way, the sheath 12 of fibre ribbon 10 breaks, and fibre ribbon 10 is branched off into each optical fiber.
Press to the power of fibre ribbon 10 by regulating resilient material 63, the loss variable quantity of light signal when branch becomes and is equal to or less than 1.0dB.Further, according to bifurcation approach, this variable quantity of loss can be reduced to the value that is equal to or less than 0.5dB.Correspondingly, even when fibre ribbon comprises alive circuit, can even not make fibre ribbon branch in a flash with not cutting off alive circuit yet.
Branch's character of fibre ribbon shown in the review table 1, jacket thickness is more little, just might have better branch character.Although when jacket thickness t is 20 μ m, being evaluated as of branch's character " all right ",, when jacket thickness t is equal to or less than 15 μ m, being evaluated as of branch's character " good ".That is to say that the thickness of the straight portion 18 of sheath 12 is more little, just the easy more sheath 12 of peeling off.
In an identical manner, check the assessment of loose coiling PMD and optical cable PMD.Pine coiling PMD is the polarisation mode dispersion under the state that twines fibre ribbon with round-shaped loosely, and optical cable PMD then is the polarisation mode dispersion when fibre ribbon forms optical cable.For the assessment of loose coiling PMD and optical cable PMD, symbol " good " represents that they are value 0.05＜PMD≤0.1 (ps/km
1/2) situation, and symbol " all right " represents that they are value 0.1＜PMD≤0.2 (ps/km
1/2) situation.For the assessment of loose coiling PMD or optical cable PMD shown in the table 1,, when jacket thickness is 10 μ m, 5 μ m, be evaluated as " good " although when jacket thickness is 20 μ m and 15 μ m, be evaluated as " all right ".
That is to say, when tape thickness when concerning T≤d+20 (μ m), for this jacket thickness, loose coiling PMD and optical cable PMD be for well, and branch's character is also for well.When the jacket thickness of fibre ribbon approached, optical fiber did not separate, and the easy deflection of fibre ribbon or crooked easily.Thereby, easy curved fiber band under loose coiling state, and further, easy curvature bending fibre ribbon along the optical cable slit.
Further think: thinner by making sheath, the curing shrinkage internal stress in the time of can making integrated optical fiber is less, and can improve PMD.
Further, although not shown in the table 1,, that is,, might advantageously guarantee the unseparated fibre ribbon integrality of optical fiber when fibre ribbon forms optical cable for the fibre ribbon of thickness above d+40 (μ m) for the fibre ribbon of thickness greater than 290 μ m.Yet this needs long time when carrying out branch, thereby it is favourable making the maximum ga(u)ge of fibre ribbon be equal to or less than d+40 μ m.In the case, to be equal to or less than 20 μ m be favourable to jacket thickness t.This means in Fig. 1, sheath equates it is favourable in the thickness t of part on the optical fiber substantially with the thickness t of sheath part under optical fiber.In the case, the nuclear core 13a of optical fiber 11 almost is positioned at the center of fibre ribbon 10 thickness directions, thereby when fibre ribbon was connected to each other, the position of the nuclear core of two fibre ribbons was aligned with each other basically, thereby junction loss is less.
[table 2]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness (μ m) | Branch's character | Pine coiling PMD | | |
| 125 | 165 | 20 | All right | All right | All right | |
| 125 | 155 | 15 | Good | All right | All right | |
| 125 | 145 | 10 | | Good | Good | |
| 125 | 35 | 5 | Good | Good | Good |
Table 2 illustrates the relation between optical fiber outside diameter d, fibre ribbon maximum ga(u)ge T and the jacket thickness t of the fibre ribbon that uses external diameter 125 μ m optical fiber.The explanation of the explanation of branch's character of jacket thickness, fibre ribbon, loose coiling PMD and optical cable PMD and evaluation symbol " good " and symbol " all right " is similar to associative list 1 explanation, thereby omits these explanations at this.
When tape thickness is 165 μ m, set up the relation of T≤d+40 μ m, and being evaluated as of branch's character " all right ".This means, in the time might carrying out calmly, can carry out charged branch.Further, be equal to or less than the situation of 155 μ m, that is, set up the relation of T≤d+30 μ m for tape thickness, being evaluated as of branch's character " good ", and, can in 2 or 3 minutes, advantageously carry out charged branch.
Although not shown in the table 2, but, the fibre ribbon that surpasses 165 μ m for tape thickness, promptly for the fibre diameter that is equal to or greater than d+40 μ m, when not increasing fibre loss, carry out the required time lengthening (for example, above 5 minutes) of branch, thereby it is favourable that tape thickness T is equal to or less than d+40 μ m.Correspondingly, in the mode identical with table 1, it is favourable that jacket thickness t is equal to or less than 15 μ m.
When loose coiling PMD in review table 2 and optical cable PMD,, when jacket thickness is 10 μ m, 5 μ m, be evaluated as " good " although when jacket thickness is 20 μ m and 15 μ m, be evaluated as " all right ".When the straight portion of sheath and sheath is thin, the easy deflection of fibre ribbon or crooked easily, thereby optical fiber does not separate, and fibre ribbon forms loose coiling state easily, and further, fibre ribbon is consistent with the curvature of optical cable slit easily.Further, when sheath forms thinly, think to reduce curing shrinkage internal stress when integrated optical fiber, thereby, PMD can be improved.Consider the PMD of optical fiber, the relation of T≤d+20 (μ m) is favourable.
When making fibre ribbon, as shown in Figure 3, the situation that has each optical fiber 11A, 11B, 11C, 11D not to line up at grade.In the drawings, sheath 12 has the thickness of hope at optical fiber 11A, 11D place, but optical fiber 11B, 11C skew, thereby sheath is at optical fiber 11B, the futureless thickness in 11C place.For the thickness of sheath 12 at optical fiber 11B place, this thickness ratio wishes that thickness is thinner on last straight portion 18U, but this thickness ratio wishes that thickness is thicker on following straight portion 18L.On the other hand, for optical fiber 11C, sheath 12 is made thicklyer on last straight portion 18U, is then making thinlyyer on the straight portion 18L down.In this fibre ribbon, wish in the zone of jacket thickness not obtaining, the ratio between maximal value and the minimum value, promptly to be equal to or less than 3 in thinner side be favourable to the maximum/minimum of jacket thickness.
That is to say that in fibre ribbon shown in Figure 3, the thickness t L of the thinner sheath of the following straight portion 18L of optical fiber 11C has maximal value, and, the thickness t S of the thinner sheath of the last straight portion 18U of optical fiber 11B has minimum value, wherein, sets up the relation of tL/tS≤3.As long as set up the relation of tL/tS≤3, just can prevent the scrambling (anisotropy of stress) of sheath, this scrambling is the reason of PMD variation.Although fibre ribbon shown in Figure 3 uses 4 optical fiber, be not limited to this quantity.That is to say, for the fibre ribbon that uses multifiber, when jacket thickness when wishing the thickness skew, obtain the maximal value and the minimum value of the thickness of thinner side sheath respectively.If the maximal value of the thickness of thinner side sheath and the ratio between the minimum value are equal to or less than 3, just can correctly use fibre ribbon.
When making fibre ribbon, when solidifying sheath, produce cure shrinkage.Such trend is arranged: along with the Young modulus of sheath increases, so cure shrinkage and the stress that acts on the optical fiber also increases.Further, when producing strain in the glass fibre at optical fiber, PMD might increase, and the recruitment of PMD depends on that the coating (color layer, protective seam etc.) by glass fibre arrives the size of the stress of glass fibre.Correspondingly, ratio between the Young modulus of the Young modulus by setting sheath and the product of cross-sectional area and optical fiber and the product of cross-sectional area (below be called ES product than) is the value in wishing scope, or, just can reduce PMD for being equal to or less than the value of desired value.
[table 3]
| Glass diameter (μ m) | 125 | 125 | 125 | 125 | 125 | 80 | 80 | 80 | 80 |
| External diameter (μ m) | 250 | 250 | 250 | 250 | 250 | 125 | 125 | 125 | 125 |
| Tape thickness (μ m) | 290 | 275 | 270 | 290 | 275 | 165 | 165 | 150 | 145 |
| The Young modulus of sheath (MPa) | 900 | 900 | 900 | 1200 | 1200 | 900 | 1200 | 1200 | 1200 |
| ES product ratio | 0.023 | 0.019 | 0.018 | 0.031 | 0.026 | 0.02 | 0.027 | 0.021 | 0.019 |
| Pine coiling PMD | Good | Very good | Very good | All right | Good | Very good | Good | Good | Very good |
Table 3 illustrates the ES product ratio of the fibre ribbon that uses diameter 250 μ m and 125 μ m optical fiber and the relation between the loose coiling PMD.Glass diameter in the table 3 is represented the external diameter of glass fibre part, and external diameter is represented the external diameter of optical fiber, and tape thickness is represented the maximum ga(u)ge of fibre ribbon.ES product ratio is the ratio between the sum of products of the Young modulus E of the product of the Young modulus E of sheath (resin) 12 and cross-sectional area S and each optical fiber 11 and cross-sectional area S.
That is to say, as shown in Figure 4, in the xsect of fibre ribbon 10, (for example by two straight lines, dotted line X shown in Figure 4, Y) in the interior zone of Que Dinging, wherein, described straight line be connected two adjacent fiber 11b, the straight line quadrature at each center of 11c also passes this two optical fiber 11b, each center of 11c, suppose sheath 12U, the cross-sectional area of 12L is S1, the Young modulus of these sheaths is E1, optical fiber 11b, the cross-sectional area sum of 11c is S2, and, optical fiber 11b, the Young modulus of 11c is E2, by formula ES product than=(E1 * S1)/(E2 * S2), can obtain ES product ratio.Here, (E2 * S2) refers to constitute the ES sum of products of each material of optical fiber to the ES product of optical fiber 11b, 11c.That is to say that the ES product of optical fiber 11 shown in Figure 1 refers to constitute each Young modulus of nuclear core 13a, covering 13b, diaphragm 14 and color layer 15 of optical fiber 11 and the ES sum of products of cross-sectional area.
By coating first and second protective finish on the glass fibre of making by nuclear core covering, and further by placing the coating color layer at the outer of second protective finish, and be configured for the optical fiber of table 3 example illustrated.For the Young modulus of this optical fiber, the Young modulus of glass fibre is 73000 (MPa), and the Young modulus of main protection coating 1 is 1 (MPa), and the Young modulus of auxiliary protection coating 1 is 700 (MPa), and the Young modulus of color layer is 1500 (MPa).
For the assessment of loose coiling PMD in the table 3, " very good " expression polarisation mode dispersion (PMD) is equal to or less than 0.05 (ps/km
1/2), " good " expression polarisation mode dispersion (PMD) is at 0.05＜PMD≤0.1 (ps/km
1/2) scope in, and " all right " expression polarisation mode dispersion (PMD) at 0.1≤PMD≤0.2 (ps/km
1/2) scope in.When ES product ratio is 0.031, being evaluated as of loose coiling PMD " all right ".As long as the ES product is than in the scope of 0.026-0.021, assessment is " good " just, and, when ES product ratio becomes when being equal to or less than 0.020, be evaluated as " very good ".In fibre ribbon according to the present invention, when ES product ratio is equal to or less than 0.026, obtains loose coiling PMD and be equal to or less than 0.1 (ps/km
1/2) favourable outcome.Further, when ES product ratio was equal to or less than 0.020, obtaining loose coiling PMD was 0.5 (ps/km
1/2) more favourable outcome.For the optical fiber of external diameter 250 μ m, as long as set up the relation of T≤d+25 μ m, the ES product is equal to or less than 0.019 than just becoming, thereby loose coiling PMD becomes highly beneficial.Further, for the optical fiber of external diameter 125 μ m, as long as set up the relation of T≤d+25 μ m, the ES product is equal to or less than 0.021 than just becoming, thereby loose coiling PMD becomes favourable.Further, comprise that by use Young modulus is equal to or greater than the optical fiber of the sheath of 200MPa, each fibre ribbon just is not separated into each optical fiber, thereby, can reduce jacket thickness.Further, in the time can reducing jacket thickness, peel off sheath easily, thereby, charged branch carried out easily.Further, easy curved fiber band, thereby, increase loose coiling PMD.When fibre ribbon had multilayer (n layer) sheath, the ES product that can use each layer was than the E1 * S1 of sum as fibre ribbon.
In fibre ribbon according to the present invention, it is favourable that the mode field diameter (MFD) that defines according to Petermann-I under wavelength 1.55 μ m is equal to or less than 10 μ m, and MFD is that 8 μ m are more favourable.Utilize this little MFD, can suppress the macrobending loss of optical fiber.Further, the sheath of fibre ribbon thin and crooked easily (deflection easily), thereby when active side pressure on fibre ribbon, the macrobending loss that can suppress to cause because of wall pressure increases.
Simultaneously, to be equal to or less than 1.26 μ m be favourable to the cable cut-off wavelength of the glass fibre of optical fiber.LP when cable cut-off wavelength is illustrated in 22m length
11The cutoff wavelength of pattern and be the value littler than 2m cutoff wavelength.
Further, in fibre ribbon according to the present invention, the loss that the adhesion strength between optical fiber and the sheath influences sometimes when carrying out charged branch increases and hot line job efficient.For the adhesion strength between optical fiber 11 and the sheath 12, consider to prevent that loss from increasing and branch's operability that the adhesion strength of each root optical fiber is favourable within scope 0.245 (mN)-2.45 (mN).When above-mentioned adhesion strength than above-mentioned scope more hour, cause following situation: sheath 12 breaks when forming optical cable, and optical fiber 11 is disconnected from each other.On the other hand, when adhesion strength during greater than above-mentioned scope, branch's character descends.
Adhesion strength between measuring optical fiber and the sheath by the following method.As shown in Figure 5, shrink the blade C of cutter and a side contacts of fibre ribbon 10, and in this blade incision fibre ribbon 10, the interface between this blade arrival optical fiber and sheath.Towards the end moving blade of fibre ribbon 10, peel off the sheath on fibre ribbon one side by in a longitudinal direction.Peel off the sheath 12 on the opposition side of fibre ribbon 10 ends, and fold back with hand.As shown in Figure 6, the optical fiber 11 that its sheath is stripped from is fixed by lower chuck 50L, and the end of backfolding sheath 12 is clamped with upper chuck 50U.Distance setting between upper and lower chuck 50U, the 50L is about 40mm.Upper chuck 50U and lower chuck 50L are that the speed with 200mm/ minute moves 50mm on 180 ° the direction making relative angle between them, thereby, peel off sheath 12.
4 values altogether that constitute by maximal value, minimum value, second maximal value and second minimum value from sample of measured value, obtain their mean value, and then, the value that mean value is obtained divided by the quantity of included optical fiber in the fibre ribbon is as the adhesion strength of each fibre ribbon.
In fibre ribbon 10 according to the present invention, when fundamental purpose of the present invention is to make optical fiber 11 being kept perfectly property and when not disconnected from each other, it is favourable that jacket thickness is equal to or greater than 0.5 μ m.In the case, the maximum ga(u)ge T of fibre ribbon 10 becomes T 〉=optical fiber outside diameter d+1 (μ m).
In addition, in some cases, according to the character of the sheath 12 of fibre ribbon 10, the loss during the charged branch of these property effects increases and branch operation efficient.Preferably as the yield point stress of sheath material character in the scope of 20MPa-45MPa.This is because carry out easily branch operation, and can be suppressed at the loss when carrying out charged branch.According to JISK7113, under 50mm/ minute draw speed, measure the yield point stress of No. 2 sample.When yield point stress during less than 20MPa, following situation appears: the assembling optical fiber band with the step that forms optical cable in, each optical fiber separates because of the external force that affacts on the optical fiber, thereby, can not form optical fiber.On the other hand, when yield point stress surpasses 45MPa, be difficult to make sheath to break, thereby, the intermediate column branch that is difficult to carry out fibre ribbon.Can regulate yield point stress by the material that changes sheath.When ultraviolet curable resin is used as sheath material, by increasing oligomer concentrations and passing through to increase urethane groups concentration or two key concentration, the yield point stress increase.Further, for sheath material, also can use the monomer that comprises polar group such as-vinyl-pyrrolidone, N-vinyl-caprolactam etc.
Available following mode is measured Young modulus E.At first, the resin that is used to form sheath 12 by use is prepared plate.Then, form the sample of No. 2 dumbbell of JIS that defines by use in JIS K7113, distance is drop-down this plate of condition of 1mm/ minute for 25mm and draw speed between graticule.Here, calculate the stretching secant Young's modulus based on the pulling strengrth when 2.5% extends.
Understand according to experiment, when the Young modulus of sheath 12 surpassed 1200MPa, sheath 12 was too hard, and when the thickness of sheath 12 greatly time the, branch's properties deterioration of optical fiber 11.On the other hand, when the Young modulus of sheath 12 was equal to or less than 200MPa, sheath 12 was too soft and rupture in next makes the step of optical cable, thereby, the state that can not be kept perfectly.Correspondingly, the Young modulus of sheath 12 is set at and is equal to or less than 1200MPa and is favourable greater than 200MPa.
Further, branch is with integrated also relevant with the breaking elongation of the resin that forms sheath 12.When length growth rate is equal to or less than 60%, optical fiber 11 easy branches.Yet when length growth rate was equal to or less than 10%, optical fiber broke in the process of next manufacturing optical cable, thereby the state that can not be kept perfectly.Correspondingly, breaking elongation is equal to or less than 60% and be favourable greater than 10%.
Further, can measure tension fracture elongation rate in the following manner.At first, the resin that is used to form sheath 12 by use is prepared plate.Then, when being when by stretching No. 2 sample of JIS that defines in JIS K7113 being broken under 50mm/ minute the condition at draw speed, based on the ratio of elongation of this sample and obtain tension fracture elongation rate (%).
For the blending of the ultraviolet curable resin of preparing to have above-mentioned Young modulus, the addition of molecular weight that can be by reducing oligomer or the bisphenol a diacrylate by increasing bi-functional monomer such as oxirane modification etc., and increase Young modulus.
Further, in the blending of carrying out resin so that resin when having above-mentioned breaking elongation, by increasing molecular weight such as glycol in the oligomer of PTMG etc., or the addition of the bisphenol a diacrylate by reducing bi-functional monomer such as oxirane modification etc., breaking elongation might be increased.
Even when satisfying this condition, when the loss when optical fiber 11 branches was big, optical cable was not suitable as product.That is to say, when the loss increase when branch becomes greater than 1.0dB, might interrupt communication.Correspondingly, to be equal to or less than the fibre ribbon of 1.0dB be the fibre ribbon that can be used for charged branch in the loss increase during branch, and thereby be preferred.More preferably the loss during branch is equal to or less than 0.5dB.
At this, for example, following execution is pressed in the measurement to loss when optical fiber 11 branches.An end face of fibre ribbon 10 is connected to light source, and the other end of fibre ribbon 10 is connected to optical receiver.Then, incide on the optical fiber 11 from the light of the wavelength 1.55 μ m of light emitted, and monitor the power (for example, being converted to the waveform of voltage) that receiver received.When the interference that produces because of branch causes loss, power attenuation, thereby, can calculate loss based on this damping capacity.
Further, for the glass fibre 13 of optical fiber 11, the macrobending loss when wavelength 1.55 μ m and bending diameter 15mm is set at the value that is equal to or less than the 0.1dB/ circle.By before enclosing around windings optical fiber such as metal bar tens and the difference of loss afterwards obtain macrobending loss divided by the number of turns.
As mentioned above, fibre ribbon 10 of the present invention has the following advantages: the polarisation mode dispersion (PMD) under the loose coiling state becomes and is equal to or less than 0.2 (ps/km
1/2).Further, fibre ribbon 10 of the present invention also has the following advantages: the PMD that constitutes the optical fiber of fibre ribbon after fibre ribbon forms optical cable becomes 0.2ps/km
1/2Because it is thinner to cover optical fiber 11, the sheath 12 of 11A, 12A, thereby fibre ribbon is crooked easily.Correspondingly, even when fibre ribbon forms with loose coiling state, do not act on too much external force yet, and can reduce PMD.Because the long Distance Transmission of PMD influence, therefore, but show the fibre ribbon executive chairman Distance Transmission of little PMD.Polarisation mode dispersion (PMD) under the more preferably loose coiling state is equal to or less than 0.1ps/km
1/2
On the other hand, for the correlation technique banded structure, usually, it is the sheath coating covering of 25-40 μ m that all optical fiber are all used thickness.It is believed that when coating is solidified, keep stress etc. and the strain that produces in optical fiber, wherein, described stress produces because of cure shrinkage, thereby, polarisation mode dispersion increased.
Here, for the method for after fibre ribbon forms optical cable, measuring polarisation mode dispersion (PMD), can enumerate reference test method (RTM) and alternately testing method (ATM).For RTM, can enumerate Jones-matrix (JME) method or Poincare spheroid (PS) method.On the other hand, for ATM, can enumerate polarized state (SOP) method, interference technique, fixed analyzer (FA) method etc.Under loose coiling state, use the polarisation mode dispersion of the optical fiber of said method measuring optical fiber band, wherein, preferred maximum is equal to or less than 0.2ps/km
1/2, and more preferably maximal value is equal to or less than 0.1ps/km
1/2
Below, explain manufacture method according to fibre ribbon of the present invention.
Fig. 7 is the key diagram that illustrates according to the manufacture method of fibre ribbon 10 of the present invention.In feeding mechanism 100 inside, arrange spool 21a-21d, unsteady roller 22a-22d and guide roller 23. Optical fiber 11a, 11b, 11c, 11d are wrapped in respectively on spool 21a, 21b, 21c, the 21d.These optical fiber are corresponding with the optical fiber of explaining in conjunction with fibre ribbon shown in Figure 1 11.Here, although make an explanation according to the example that uses 4 optical fiber to make fibre ribbon, the quantity of optical fiber is unrestricted.
Send optical fiber 11a, 11b, 11c, 11d to from spool 21a, 21b, 21c, 21d respectively, and unsteady roller 22a, 22b, 22c, 22d act on the tension force of tens gf on optical fiber 11a, 11b, 11c, 11d.As optical fiber 11a, 11b, when 11c, 11d pass through guide roller 23, on arrayed surface, arrange optical fiber 11a, 11b, 11c, 11d.Further, optical fiber 11a, 11b, 11c, 11d further assemble by overhead guide roller 24, and are fed to applying device 26.Applying device 26 comprises nozzle 25, mould 27.The optical fiber 11a-11d that is fed to applying device 26 is by nozzle 25 guiding.
As shown in Figure 8, nozzle 25 has oval wire hole 25a.For the size of wire hole 25a, the quantity of supposing optical fiber 11 is N (is 4 at this), and width W n and thickness T n just use following formulate respectively.
External diameter * the N+0.03 to 0.08mm of Wn=optical fiber
When fiber arrangement must contact with each other, preferably set the external diameter * N+0.03 to 0.05mm of Wn=optical fiber.
Thickness T n is preferably set to the external diameter of formula Tn=optical fiber+0.005 and represents to 0.01mm.
In applying device 26, arrange mould 27 shown in Figure 9.Mould 27 is provided with the slotted eye 27a that passes each optical fiber 11a, 11b, 11c, 11d.
The height H of the hole 27a of preferred mold 27 is set at external diameter+0.005 of H=optical fiber to 0.05mm.Further, the width W d of the hole 27a of mould 27 is set at Wd=H * N.Here, because mould 27 is made specially by the line electrodischarge machining, therefore, it is bigger than linear diameter at least that H becomes.The H minimum is about 0.05 to 0.08mm.Further, for the hole 27a that prevents mould 27 when optical fiber 11 contacts with hole 27a damages optical fiber 11, for example, peripheral part and the corner portions located of setting the hole 27a of mould 27 are smooth curved shape such as R (circle).The size design of the hole 27a of mould 27 must be corresponding with the thickness of the external diameter of optical fiber and sheath.The maximum ga(u)ge of supposing fibre ribbon is T, might make the fibre ribbon with thickness T, and wherein, thickness T adopts the value such as T≤d+40 (μ m), T≤d+20 (μ m).In mould 27 shown in Figure 9, when hole 27a is formed by arcuate section 50a and straight line portion 50b, can be on straight line portion 50b application of resin equably, thereby fibre ribbon and resin-coated variation in thickness can not interrupted.Correspondingly, preferably adopt this structure.Because the sheath according to fibre ribbon of the present invention has little thickness, thereby the gap between optical fiber and the mould is less.For preventing that resin from interrupting, be fixed value perhaps in order to set tape thickness, the viscosity of preferred resin under application temperature is in the scope of 1000Pas-20000Pas.
At optical fiber 11a, 11b, when 11c, 11d arrive applying device 26,4 optical fiber 11a, 11b, 11c, 11d in one plane are arranged in parallel with the state that they contact with each other, wherein, around optical fiber 11a, 11b, 11c, 11d, apply ultraviolet curable resin.Provide ultraviolet curable resin from pressure resin container 28.For 4 optical fiber 11a, 11b, 11c, the 11d of coating ultraviolet curable resin, with ultraviolet lamp 29 irradiation ultraviolet radiations, so that ultraviolet curable resin is solidified.The ultraviolet curable resin that solidifies forms sheath 12, thereby, can form 4-fiber optic band 10.
By the fibre ribbon 10 that solidifies from ultraviolet lamp 29 irradiation ultraviolet radiations by guide roller 30, loosen capstan winch 31 and the Winding Tension Controlling roller 32 that floats and be fed to collecting device 33.In collecting device 33, fibre ribbon 10 is wound on the spool 33b by angle sheave 33a.The winding tension of whole fibre ribbon is set at tens gf-hundreds of gf.
As mentioned above, according to the method for making fibre ribbon, these optical fiber that under the state that 4 optical fiber 11a, 11b, 11c, 11d contact with each other, are arranged in parallel, and, on the outside of optical fiber 11a, 11b, 11c, 11d, form sheath 12, so that these optical fiber become integral body.Since the maximal value of ribbon thickness be set at from fibre diameter in scope than the value of the big 40mm of fibre ribbon diameter, therefore, each optical fiber 11 easy branches (charged branch).
Be not limited to the foregoing description according to fibre ribbon of the present invention and manufacture method thereof, can make suitable modification and improvement.
The modification of the fibre ribbon according to first embodiment of the invention shown in Figure 10.In fibre ribbon 10A shown in Figure 10, use resin 12aA adjacent optical fiber 11A of whole formation on whole length.Resin 12aA forms to such an extent that make resin 12aA fill recess between the optical fiber 11A, and adjacent optical fiber 11A is adhered to each other.Further, the maximum ga(u)ge of fibre ribbon 10 is set the outside diameter d that thickness for this reason is no more than optical fiber 11A.For this reason, the maximum ga(u)ge T of fibre ribbon 10 sets to such an extent that equal the outside diameter d of optical fiber 11A.
Below, explain fibre ribbon and manufacture method thereof in conjunction with the accompanying drawings in detail according to second embodiment of the invention.
Figure 11 A is the viewgraph of cross-section that illustrates according to fibre ribbon second embodiment of the present invention, and Figure 11 B is the skeleton view of fibre ribbon.By many (in this embodiment, for example the being 4) optical fiber 111 that are arranged in parallel, and, outside these optical fiber that are arranged in parallel 111 whole, place and the whole length at optical fiber 111 on coating sheath 112, and form fibre ribbon 110.In fibre ribbon according to the present invention, shown in Figure 11 A, optical fiber contacts with each other.Here, " contacting with each other " comprises following situation: have the interval that is equal to or less than 10 μ m between the adjacent fiber of fibre ribbon, as foozle.The situation that contacts with each other for the optical fiber that relatively is included in the fibre ribbon and be included in the situation that the optical fiber in the fibre ribbon does not contact with each other, when optical fiber contacts with each other, the easy branch of fibre ribbon.Even when optical fiber does not contact mutually, as long as the interval between the adjacent fiber of fibre ribbon is equal to or less than 10 μ m, form sheath and clamp-on the amount of the resin between the optical fiber just less, thereby, carry out branch easily.Optical fiber 111 is made of glass fibre 113, protective finish 114 and color layer, and wherein, glass fibre 113 is formed the periphery of protective finish 114 cover glass fibers 113, and the periphery 115 of color layer covering protection coating 114 by nuclear core 113a and covering 113b.Further, peripheral 115 can constitute the auxiliary protection film, and form the color layer that thickness is approximately 1 μ m-10 μ m on peripheral 115.Further, on around the glass fibre 113, form the film like carbon-coating by coating.Here, preferred fiber 111 meets the G652 of regulation in ITU-T (International Telecommunications Union (ITU)-telecommunication standardization sector).
In this fibre ribbon 110, at the periphery of 4 optical fiber 111 that are arranged in parallel coating ultraviolet curable resin, as sheath 112.For the material of sheath 112, except ultraviolet curable resin, also can use thermoplastic resin, thermosetting resin etc.
In covering the sheath 112 of optical fiber 111, in sheath 112, form with adjacent fiber 111,111 between the consistent recessed portion 116 of the recess that forms.
When peeling off sheath 112 from fibre ribbon 110 and make optical fiber 111 branches, the recessed portion 116 that forms in sheath 112 is effective.When carrying out the branch operation of optical fiber 111, the manual operations by the operator or branch's instrument and in sheath 112, produce the crack or delaminate, thereby, peel off sheath 112 easily.
Consider that the loss when realizing favourable branch's operability and suppressing charged branch increases, and has confirmed that in fibre ribbon according to the present invention there is fixing scope in jacket thickness.
Table 4 illustrates the relation between the degree of depth Y of optical fiber outside diameter d, fibre ribbon maximum ga(u)ge T, jacket thickness t and sheath recessed portion.This table is used to show branch's character of fibre ribbon, loose coiling PMD and optical cable PMD.Here, jacket thickness t is the wall thickness of the sheath outside the common tangent of each optical fiber of fibre ribbon.
[table 4]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness t (μ m) | The degree of depth Y of sheath recessed portion (μ m) | Ratio (T-d)/2Y | At the tape thickness g of recessed portion (μ m) | Ratio g/d | Branch's character | Pine coiling PMD | Optical cable PMD |
| 250 | 290 | 20.0 | 1 | 20.00 | 288 | 1.152 | All right | All right | All right |
| 250 | 290 | 20.0 | 2 | 10.00 | 286 | 1.144 | All right | All right | All right |
| 250 | 290 | 20.0 | 5 | 4.00 | 280 | 1.120 | Good | Good | All right |
| 250 | 290 | 20.0 | 10 | 2.00 | 270 | 1.080 | Good | Good | All right |
| 250 | 290 | 20.0 | 20 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
| 250 | 280 | 15.0 | 1 | 15.00 | 278 | 1.112 | Good | All right | All right |
| 250 | 280 | 15.0 | 2 | 7.50 | 276 | 1.104 | Good | All right | All right |
| 250 | 280 | 15.0 | 5 | 3.00 | 270 | 1.080 | Very good | Good | All right |
| 250 | 280 | 15.0 | 10 | 1.50 | 260 | 1.040 | Very good | Good | All right |
| 250 | 270 | 10.0 | 1 | 10.00 | 268 | 1.072 | Good | Good | Good |
| 250 | 270 | 10.0 | 2 | 5.00 | 266 | 1.064 | Good | Good | Good |
| 250 | 270 | 10.0 | 5 | 2.00 | 260 | 1.040 | Very good | Good | Good |
| 250 | 270 | 10.0 | 10 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
| 250 | 260 | 5.0 | 1 | 5.00 | 258 | 1.032 | Good | Good | Good |
| 250 | 260 | 5.0 | 2 | 2.50 | 256 | 1.024 | Very good | Good | Good |
| 250 | 260 | 5.0 | 5 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
In table 4, shown in Figure 11 A, fibre diameter refers to the outside diameter d of optical fiber 111, and tape thickness is the maximum ga(u)ge T of fibre ribbon 110, and jacket thickness is the length t between the common tangent S2 of the common tangent S1 of sheath 112 and optical fiber 111, and can obtain by formula t=(T-d)/2.The degree of depth of sheath recessed portion is the length Y between the bottom 117 of recessed portion 116 of the common tangent S1 of sheath 112 and sheath 112.The optical fiber external diameter of fibre ribbon shown in the table 4 is 250 μ m.
Branch's character shown in the table 4 is illustrated in and suppresses that loss increases to 1.0dB or the easy degree of branch when the center section of fibre ribbon is branched off into each optical fiber littler the time." very good " expression can be carried out branch in 2 minutes." good " expression can surpass 2 minutes and carry out branch in time within 3 minutes, and " all right " be then represented and can carry out branch above in 3 minutes and time within 5 minutes.The fact that loss increase during branch is equal to or less than 1.0dB means can carry out charged branch.
Fibre ribbon shown in the table 4 shows the relation of T≤d+40 (μ m), thereby all fibre ribbons show the branch's character that is better than " all right ", wherein, loss increase during by setting branch is equal to or less than 1.0dB, can carry out intermediate column branch within 5 minutes.That is to say, can within 5 minutes, carry out charged branch.For the correlation technique fibre ribbon, the loss increment during branch surpasses 1.0dB, perhaps, even separable optical fiber, but the correlation technique fibre ribbon also requires to surpass 5 minutes preset time, thereby, consider from real viewpoint, can not carry out charged branch.
For above-mentioned charged branch, explain an example of branching method.Shown in Figure 12 A, fibre ribbon 110 is clipped in going up basis 161 and down between the basis 162, wherein, making at the sheath 112 of these wire rods 163 that forms in upright mode on upper and lower basic 161,162 near fibre ribbon 110 of branch's instrument 160.Figure 12 B illustrates the xsect of this structure.Further, by branch's instrument 160 is pressed to fibre ribbon 110, shown in Figure 12 C, wire rod 163 deflections, and the sharp angle of the end of deflection wire rod 163 contacts strongly with the sheath 112 of fibre ribbon 110.
By being gone up at the longitudinal direction (the left and right direction among Figure 12 C) of fibre ribbon 110, moves by branch's instrument 160 relative to fibre ribbon 110, promptly, by the fibre ribbons 110 that rub with branch's instrument 160, on sheath 112, form crackle, perhaps peel off sheath 112 with the end of wire rod 163, thereby, make optical fiber 111 branches.In removable branch instrument 160 and the fibre ribbon 110 any or all.Wire rod 163 is resilient, thereby, when wire rod 163 is pressed to the sheath 112 of fibre ribbon 110, wire rod 163 deflections, and the angle part of the end of wire rod 163 contacts with sheath 112.By mobile branch instrument 160 or fibre ribbon 110 under this state, wire rod 163 (flexible part) cracks on sheath 112, or peels off sheath 112.By the fibre ribbon 110 that repeats to rub with branch's instrument 160, peel off the color layer 115 of optical fiber 111 and the interface between the sheath 112.When further repeating to rub, scrape off sheath 112 on optical fiber 111 central shafts or under part, and produce the crack, subsequently, the crack is concentrated by pressure and is developed into the recessed portion 116 of sheath 112, thereby, peel off sheath 112.In this way, the sheath 112 of fibre ribbon 110 breaks, and fibre ribbon 110 is branched off into each optical fiber.
Press to the power of fibre ribbon 110 by regulating resilient material 163, the loss variable quantity of light signal when branch becomes and is equal to or less than 1.0dB.Further, according to bifurcation approach, this variable quantity of loss can be reduced to the value that is equal to or less than 0.5dB.Correspondingly, even fibre ribbon comprises alive circuit, can even not make fibre ribbon branch in a flash with not cutting off alive circuit yet.
Branch's character of fibre ribbon in the review table 4, jacket thickness is more little, just might have better branch character, even the degree of depth of sheath recessed portion less also be like this.Although at jacket thickness t is under the situation of 20 μ m, when the degree of depth Y of sheath recessed portion is 20 μ m, being evaluated as of branch's character " very good ".On the other hand, be equal to or less than at jacket thickness t under the situation of 15 μ m, when the degree of depth Y of sheath recessed portion is equal to or greater than 5 μ m, being evaluated as of branch's character " very good ".Correspondingly, if jacket thickness t is equal to or less than 15 μ m, even when the degree of depth of the recessed portion of sheath 112 is more shallow, also might obtain extremely beneficial branch's character.In other words, when the maximum ga(u)ge T of optical fiber is T≤d+30,, just might have extremely outstanding branch's character as long as there is shallow recessed portion.
When tape thickness was 290 μ m, if the value of ratio (the T-d)/2Y between the degree of depth Y of jacket thickness ((T-d)/2) and sheath recessed portion is equal to or less than 4, the assessment of branch's character just became " very good " or " good ", thereby, can strengthen branch's character.
In an identical manner, check the assessment of loose coiling PMD and optical cable PMD.Pine coiling PMD is the polarisation mode dispersion under the state that twines fibre ribbon with round-shaped loosely, and optical cable PMD is the polarisation mode dispersion when fibre ribbon forms optical cable.For the assessment of loose coiling PMD and optical cable PMD, symbol " very good " represents that they are value 0.05 (ps/km
1/2) or littler situation, " good " expression polarisation mode dispersion is value 0.05＜PMD≤0.1 (ps/km
1/2) situation, and symbol " all right " expression polarisation mode dispersion is value 0.1＜PMD≤0.2 (ps/km
1/2) situation.For loose coiling PMD, ratio (the T-d)/2Y between the degree of depth of jacket thickness and sheath recessed portion is 4 or more hour, is evaluated as " very good " or " good ", thereby is favourable.On the contrary, when ratio (T-d)/2Y greater than 4 the time, when tape thickness is 290 μ m, be evaluated as " all right ".In optical cable PMD, if the difference of tape thickness and fibre diameter is 30 μ m or bigger, when (T-d)/2Y is 1 or more hour, assessment be " good " just, and, when (T-d)/2Y greater than 1 the time, assessment is " all right " just.When the difference of tape thickness and fibre diameter is 20 μ m or more hour, be evaluated as " good ".
Although not shown in the table 4,, that is,, might advantageously guarantee the integrality of fibre ribbon for the fibre ribbon of thickness above d+40 (μ m) for the fibre ribbon of thickness greater than 290 μ m.Yet this needs long time when carrying out branch, thereby it is favourable making the maximum ga(u)ge of fibre ribbon be equal to or less than d+40 μ m.In the case, to be equal to or less than 20 μ m be favourable to jacket thickness t.This means in Figure 11 A, sheath equates it is favourable in the thickness t of part on the optical fiber substantially with the thickness t of sheath part under optical fiber.In the case, the nuclear core 113a of optical fiber 111 almost is positioned at the center of fibre ribbon 110 thickness directions, thereby when fibre ribbon was connected to each other, the position of the nuclear core of two fibre ribbons was aligned with each other basically, thereby junction loss is less.
Below, explain the assessment of branch's character when the tape thickness of fibre ribbon is 280 (μ m), 270 (μ m), 260 (μ m).Tape thickness at fibre ribbon is under the situation of 280 (μ m), 270 (μ m) and 260 (μ m), as long as ratio (the T-d)/2Y between the degree of depth of jacket thickness and sheath recessed portion is 4 or littler, assessment is " good " or " very good " just.Thereby branch's character is favourable.
[table 5]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness t (μ m) | The degree of depth Y of sheath recessed portion (μ m) | Ratio (T-d)/2Y | At the tape thickness g of recessed portion (μ m) | Ratio g/d | Branch's character | Pine coiling PMD | Optical cable PMD |
| 125 | 165 | 20.0 | 1 | 20.00 | 163 | 1.304 | All right | All right | All right |
| 125 | 165 | 20.0 | 2 | 10.00 | 161 | 1.288 | All right | All right | All right |
| 125 | 165 | 20.0 | 5 | 4.00 | 155 | 1.240 | Good | Good | All right |
| 125 | 165 | 20.0 | 10 | 2.00 | 145 | 1.160 | Good | Good | All right |
| 125 | 165 | 20.0 | 20 | 1.00 | 125 | 1.000 | Very good | Very good | Good |
| 125 | 155 | 15.0 | 1 | 15.00 | 153 | 1.224 | Good | All right | All right |
| 125 | 155 | 15.0 | 2 | 7.50 | 151 | 1.208 | Good | All right | All right |
| 125 | 155 | 15.0 | 5 | 3.00 | 145 | 1.160 | Very good | Good | All right |
| 125 | 155 | 15.0 | 10 | 1.50 | 135 | 1.080 | Very good | Good | All right |
| 125 | 145 | 10.0 | 1 | 10.00 | 143 | 1.144 | Good | Good | Good |
| 125 | 145 | 10.0 | 2 | 5.00 | 141 | 1.128 | Good | Good | Good |
| 125 | 145 | 10.0 | 5 | 2.00 | 135 | 1.080 | Very good | Good | Good |
| 125 | 145 | 10.0 | 10 | 1.00 | 125 | 1.000 | Very good | Very good | Good |
| 125 | 135 | 5.0 | 1 | 5.00 | 133 | 1.064 | Good | Good | Good |
| 125 | 135 | 5.0 | 2 | 2.50 | 131 | 1.048 | Very good | Good | Good |
| 125 | 135 | 5.0 | 5 | 1.00 | 125 | 1.000 | Very good | Very good | Good |
Table 5 illustrates the relation between the degree of depth Y of the thickness t of optical fiber outside diameter d, fibre ribbon maximum ga(u)ge T, sheath of the fibre ribbon that uses external diameter 125 μ m optical fiber and sheath recessed portion.The explanation of the explanation of branch's character of the degree of depth of jacket thickness, sheath recessed portion, fibre ribbon, loose coiling PMD and optical cable PMD and evaluation symbol " very good ", symbol " good " and symbol " all right " is similar to associative list 4 explanations, thereby omits these explanations at this.
When tape thickness is 165 μ m, set up the relation of T≤d+40 μ m, and the assessment of branch's character is better than " all right ".This means and to carry out charged branch.
Although not shown in the table 5, but, the fibre ribbon that surpasses 165 μ m for tape thickness, promptly for the fibre diameter that is equal to or greater than d+40 μ m, when not increasing fibre loss, carry out the required time lengthening (for example, above 5 minutes) of branch, thereby it is favourable that tape thickness T is equal to or less than fibre diameter d+40 μ m.Correspondingly, in the mode identical with table 4, it is favourable that jacket thickness t is equal to or less than 20 μ m.
The degree of depth Y of the jacket thickness t shown in the review table 5, sheath recessed portion and branch's character of fibre ribbon, t is more little for jacket thickness, even when the degree of depth Y of sheath recessed portion is more shallow, also might obtain extremely beneficial branch's character.In the jacket wall thickness t is that the degree of depth Y of 20 μ m and sheath recessed portion is under the situation of 20 μ m, and is that the degree of depth Y of 15 μ m and sheath recessed portion is equal to or greater than under the situation of 5 μ m in the jacket wall thickness t, and the assessment of branch's character becomes " very good ".Correspondingly, be 15 μ m or littler by setting jacket thickness t, that is,,, also can carry out branch operation at short notice even the recessed portion of sheath is more shallow as long as set up the relation of T≤fiber outside diameter d+30 μ m.
In table 5, when the jacket wall thickness t was equal to or less than 15 μ m, if the value of ratio (T-d)/2Y is 4 or littler, the assessment of branch's character was " very good " just, and, this means and can carry out branch operation at short notice.
Figure 13 A is the viewgraph of cross-section according to another fibre ribbon of second embodiment of the invention, and Figure 13 B then is the skeleton view of fibre ribbon.The basic structure of fibre ribbon 110 is roughly the same shown in the basic structure of fibre ribbon 110A and Figure 11 A, thereby, identical construction between them is not made an explanation.
The sheath 112A that covers optical fiber 111A periphery has and the consistent concave shape of the formed recess of adjacent fiber 111A, 111A.The recessed portion 116A of sheath has the concave shape darker than situation shown in Figure 11 A.
Examination: by be arranged in parallel multifiber with prevent separating of when making fibre ribbon optical fiber by make them become integral body with sheath, when carrying out the fitting operation of fibre ribbon, prevent to peel off (becoming the reason that optical fiber separates) the perhaps increase of loss or reduce in favourable branch operation or charged branching process.As a result, recessed portion 116A is preferably formed to recessed portion 116A and is no more than the formed common tangent S2A of adjacent fiber 111A, 111A.That is it is favourable, forming recessed portion 116A on than the position of common tangent S2A inside.
[table 6]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness t (μ m) | The degree of depth Y of sheath recessed portion (μ m) | Ratio (T-d)/2Y | At the tape thickness g of recessed portion (μ m) | Ratio g/d | Branch's character | Pine coiling PMD | Optical cable PMD |
| 250 | 290 | 20.0 | 20 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
| 250 | 290 | 20.0 | 30 | 0.67 | 230 | 0.920 | Very good | Very good | Good |
| 250 | 290 | 20.0 | 40 | 0.50 | 210 | 0.840 | Very good | Very good | Good |
| 250 | 290 | 20.0 | 50 | 0.40 | 190 | 0.760 | Very good | Very good | Very good |
| 250 | 290 | 20.0 | 60 | 0.33 | 170 | 0.680 | Very good | Very good | Very good |
| 250 | 280 | 15.0 | 20 | 0.75 | 240 | 0.960 | Very good | Very good | Good |
| 250 | 280 | 15.0 | 30 | 0.50 | 220 | 0.880 | Very good | Very good | Good |
| 250 | 280 | 15.0 | 40 | 0.38 | 200 | 0.800 | Very good | Very good | Very good |
| 250 | 280 | 15.0 | 50 | 0.30 | 180 | 0.720 | Very good | Very good | Very good |
| 250 | 280 | 15.0 | 60 | 0.25 | 160 | 0.640 | Very good | Very good | Very good |
| 250 | 270 | 10.0 | 10 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
[table 6] (continuing)
| 250 | 270 | 10.0 | 20 | 0.50 | 230 | 0.920 | Very good | Very good | Good |
| 250 | 270 | 10.0 | 30 | 0.33 | 210 | 0.840 | Very good | Very good | Good |
| 250 | 270 | 10.0 | 40 | 0.25 | 190 | 0.760 | Very good | Very good | Very good |
| 250 | 270 | 10.0 | 50 | 0.20 | 170 | 0.680 | Very good | Very good | Very good |
| 250 | 270 | 10.0 | 100 | 0.10 | 70 | 0.280 | Very good | Very good | Very good |
| 250 | 260 | 5.0 | 5 | 1.00 | 250 | 1.000 | Very good | Very good | Good |
| 250 | 260 | 5.0 | 10 | 0.50 | 240 | 0.960 | Very good | Very good | Good |
| 250 | 260 | 5.0 | 20 | 0.25 | 220 | 0.880 | Very good | Very good | Good |
| 250 | 260 | 5.0 | 30 | 0.17 | 200 | 0.800 | Very good | Very good | Very good |
| 250 | 260 | 5.0 | 40 | 0.13 | 188 | 0.720 | Very good | Very good | Very good |
| 250 | 260 | 5.0 | 50 | 0.10 | 160 | 0.640 | Very good | Very good | Very good |
| 250 | 260 | 5.0 | 100 | 0.05 | 60 | 0.240 | Very good | Very good | Very good |
Table 6 is illustrated in the relation between the tape thickness g of the degree of depth Y of the fibre diameter d shown in Figure 13 A, tape thickness T, jacket thickness t, sheath recessed portion and recessed portion, and, branch's character, loose coiling PMD and the optical cable PMD of expression fibre ribbon.In the table 6 assessment " very good " relevant with optical cable PMD and " good " with branch character, loose coiling PMD basically with table 4 in used identical of assessment, thereby omit its explanation.
Distance between common tangent S2A, the S2A of adjacent fiber 111A, 111A can be set at the outside diameter d of optical fiber, and wherein, if the g/d of ratio shown in the table 6 is equal to or less than 1.0, the recessed portion 116A that forms in sheath 112 just is no more than the common tangent S2A of optical fiber.Shown in viewgraph of cross-section 13A, recessed portion 116A is positioned at the inboard (central axis direction of optical fiber) of common tangent S2A, the S2A of optical fiber 111A.
Fibre ribbon shown in the table 6 shows ratio g/d≤1.0, thereby fibre ribbon is no more than the common tangent of optical fiber.The assessment of examination branch character, all fibre ribbons all show assessment " very good ".In the case, owing to the recessed portion 116A that forms sheath 112A along the formed recess of optical fiber 111A, 111A dearly, therefore, the thickness of the recessed portion 116A of sheath 112A can reduce, thereby optical fiber 111A is branch more easily.
Examine the assessment of loose coiling PMD, all fibre ribbons all show " very good ", thereby loose coiling PMD is extremely beneficial.For these optical fiber, owing to make thinlyyer, be no more than common tangent at the sheath at recessed portion 116A place, therefore, optical fiber is crooked easily in a longitudinal direction, and recessed portion is darker.On the other hand, as shown in figure 14, optical fiber is easy deflection on Width, thereby, when forming fibre ribbon 110A, do not have too much masterpiece to use on the fibre ribbon, thereby think that loose coiling PMD can strengthen with loose coiling state.Further, along the periphery of optical fiber 111A, the sheath 112A of fibre ribbon 110A is with circular approximate, thereby, can reduce the anisotropy of the curing shrinkage internal stress of the sheath that when making fibre ribbon, takes place, thereby think that the PMD of fibre ribbon can strengthen under loose coiling state.
The assessment of examination optical cable PMD, when ratio g/d was equal to or less than 0.8, optical cable PMD became and is lower than 0.5 (ps/km
1/2) value, thereby, obtain extremely beneficial optical cable PMD characteristic.When ratio g/d is equal to or less than 0.8, for the sheath 112A of fibre ribbon 110A, make extremely thinly, thereby fibre ribbon 110A is crooked in a longitudinal direction along the groove shape of groove easily, and crooked on Width easily at the sheath at recessed portion 116A place.Correspondingly, even twist fibre ribbon when fibre ribbon forms optical cable, fibre ribbon is also crooked, thereby, can discharge the stress that produces because of distortion, think that thus optical cable PMD can strengthen.
[table 7]
| Fibre diameter d (μ m) | Tape thickness T (μ m) | Jacket thickness t (μ m) | The degree of depth Y of sheath recessed portion (μ m) | Ratio (T-d)/2Y | At the tape thickness g of recessed portion (μ m) | Ratio g/d | Branch's character | Pine coiling PMD | | |
| 125 | 165 | 20.0 | 20 | 1.00 | 125 | 1.000 | Very good | Very | Good | |
| 125 | 165 | 20.0 | 30 | 0.7 | 105 | 0.840 | Very good | Very | Good | |
| 125 | 165 | 20.0 | 40 | 0.5 | 85 | 0.680 | Very good | Very good | Very good | |
| 125 | 165 | 20.0 | 50 | 0.4 | 65 | 0.520 | Very good | Very good | Very good | |
| 125 | 165 | 20.0 | 60 | 0.3 | 45 | 0.360 | Very good | Very good | Very good | |
| 125 | 155 | 15.0 | 20 | 0.8 | 115 | 0.920 | Very good | Very | Good | |
| 125 | 155 | 15.0 | 30 | 0.5 | 95 | 0.760 | Very good | Very good | Very good | |
| 125 | 155 | 15.0 | 40 | 0.4 | 75 | 0.600 | Very good | Very good | Very good | |
| 125 | 155 | 15.0 | 50 | 0.3 | 55 | 0.440 | Very good | Very good | Very good | |
| 125 | 155 | 15.0 | 60 | 0.3 | 35 | 0.280 | Very good | Very good | Very good | |
| 125 | 145 | 10.0 | 10 | 1.00 | 125 | 1.000 | Very good | Very good | Good |
[table 7] (continuing)
| 125 | 145 | 10.0 | 20 | 0.5 | 105 | 0.840 | Very good | Very | Good | |
| 125 | 145 | 10.0 | 30 | 0.3 | 85 | 0.680 | Very good | Very good | Very good | |
| 125 | 145 | 10.0 | 40 | 0.3 | 65 | 0.520 | Very good | Very good | Very good | |
| 125 | 145 | 10.0 | 50 | 0.2 | 45 | 0.360 | Very good | Very good | Very good | |
| 125 | 145 | 10.0 | 60 | 0.2 | 25 | 0.200 | Very good | Very good | Very good | |
| 125 | 135 | 5.0 | 5 | 1.00 | 125 | 1.000 | Very good | Very | Good | |
| 125 | 135 | 5.0 | 10 | 0.5 | 115 | 0.920 | Very good | Very | Good | |
| 125 | 135 | 5.0 | 20 | 0.3 | 95 | 0.760 | Very good | Very good | Very good | |
| 125 | 135 | 5.0 | 30 | 0.2 | 75 | 0.600 | Very good | Very good | Very good | |
| 125 | 135 | 5.0 | 40 | 0.1 | 55 | 0.440 | Very good | Very good | Very good | |
| 125 | 135 | 5.0 | 50 | 0.1 | 35 | 0.280 | Very good | Very good | Very good | |
| 125 | 135 | 5.0 | 60 | 0.1 | 15 | 0.120 | Very good | Very good | Very good |
Table 7 illustrates the relation between the tape thickness g of the degree of depth Y of fibre diameter d, tape thickness T, jacket thickness t, sheath recessed portion of the fibre ribbon that uses external diameter 125 μ m optical fiber and recessed portion.Used basic identical in explanation of the explanation of branch's character of the degree of depth of jacket thickness, sheath recessed portion, fibre ribbon, loose coiling PMD and optical cable PMD and assessment " very good ", " good " and " all right " and the table 4, thereby omit its explanation.
At jacket thickness is in arbitrary fibre ribbon of 20 (μ m), 15 (μ m), 10 (μ m) and 5 (μ m), if ratio g/d is equal to or less than 1.0, the assessment of branch's character and loose coiling PMD just becomes " very good ", if and ratio g/d is equal to or less than 0.8, the assessment of optical cable PMD just also becomes " very good ".Cause the factor of this assessment identical with the factor shown in the table 6.
Although not shown in the table 7, but, the fibre ribbon that surpasses 165 μ m for tape thickness, promptly for the fibre diameter that is equal to or greater than d+40 μ m, when not increasing fibre loss, carry out the required time lengthening (for example, above 5 minutes) of branch, thereby it is favourable that tape thickness T is equal to or less than fibre diameter d+40 μ m.
[table 8]
| Thickness g (μ m) | 200 | 160 | 120 | 80 |
| Branch's character | Good | Good | Good | Good |
| Stranding | Good | Good | Good | Good |
| Optical fiber external diameter 250 μ m | ||||
Table 8 illustrates and is illustrated in the fibre ribbon similar to fibre ribbon shown in Figure 13 A, when the optical fiber outside diameter d is 250 μ m, and the form of the relation between thickness g, branch's character and the stranding (integrality) of recessed portion 116A place fibre ribbon.Stranding in form " good " expression: although twist fibre ribbon when making optical fiber cabling by assembling optical fiber, fibre ribbon is not separated into each optical fiber because of twisting stress.Carry out the assessment of branch's character in the mode identical with table 4-7.As shown in Table, when the thickness g at the fibre ribbon at recessed portion 116A place was 80 μ m-200 μ m, it all was favourable that branch's character and band form.Here, form consideration from band, the thickness g that preferably guarantees fibre ribbon is 40 μ m or bigger.
Shown in Figure 11 A and Figure 13 A, in fibre ribbon according to the present invention, wish to form the recessed portion of sheath with smooth curve shape R.This be because when the recessed portion 116A of sheath 112A when the shape of fibre ribbon has sharp-pointed end, stress concentrates on the recessed portion end, thereby, tend to be easy to generate and break and the crack.
Further, in fibre ribbon according to the present invention, the loss that the adhesion strength between optical fiber and the sheath influences sometimes when carrying out charged branch increases and hot line job efficient.For the adhesion strength between optical fiber 111,111A and sheath 112, the 112A, consider to prevent that loss from increasing and branch's operability that the adhesion strength of each root optical fiber is favourable within scope 0.245 (mN)-2.45 (mN).When above-mentioned adhesion strength than above-mentioned scope more hour, cause following situation: sheath 112,112A break when forming optical cable, and optical fiber 111,111A are disconnected from each other.On the other hand, when adhesion strength during greater than above-mentioned scope, branch's character descends.
By the said method measuring optical fiber explained in conjunction with Fig. 5 and Fig. 6 and the adhesion strength between the sheath.
In fibre ribbon 110 according to the present invention, 110A, when fundamental purpose of the present invention is to make optical fiber 111, being kept perfectly property of 111A and when not disconnected from each other, it is favourable that the thickness of sheath 112,112A is equal to or greater than 1 μ m.In the case, the maximum ga(u)ge T of fibre ribbon 110,110A becomes T 〉=optical fiber outside diameter d+1 (μ m).
In addition, in some cases, according to the sheath 112 of fibre ribbon 110,110A, the character of 112A, the loss of these property effects when charged branch increases and branch operation efficient.Preferably as the yield point stress of sheath material character in the scope of 20MPa-45MPa.This is because carry out easily branch operation, and can be suppressed at the loss when carrying out charged branch.When yield point stress during less than 20MPa, forming by the assembling optical fiber band in the step of optical cable, because of the external force of effect makes each optical fiber separated from one another, thereby appearance can not be carried out the situation of stranding.On the other hand, when yield point stress surpasses 40MPa, be difficult to make sheath to break, thereby, the intermediate column branch that is difficult to carry out fibre ribbon.
Branch's character according to fibre ribbon of the present invention is also relevant with the physical property of sheath with the integrality band.For example, for sheath 112,112A with big Young modulus, even when or jacket thickness t littler at the thickness g of recessed portion 116,116A place fibre ribbon 110,110A than hour, also might guarantee enough constraining forces, so that optical fiber is complete.Consider from branch character, when Young modulus is big, preferably reduce the thickness g of fibre ribbon 110,110A or at the jacket thickness t at recessed portion 116,116A place.
According to experiment, should be understood that when the Young modulus of sheath 112,112A surpasses 1000MPa, if at the thickness g of recessed portion 116,116A place fibre ribbon 110,110A is 40 μ m or bigger, sheath 112,112A are just too hard, thereby branch's character of optical fiber 111,111A descends.On the other hand, find: when the Young modulus of sheath 112,112A is equal to or less than 100MPa, sheath 12 is too soft, and in the next step of making optical cable, rupture, unless the thickness g at recessed portion 116,116A place fibre ribbon 110,110A is set at 200 μ m or bigger, thereby state can not be kept perfectly.Correspondingly, the Young modulus of sheath 112,112A is set to such an extent that to be equal to or less than 1000MPa be favourable.Yet the Young modulus of preferred sheath 112,112A is greater than 100MPa.
Further, branch is also relevant with the breaking elongation of the resin that is used to form sheath 112,112A with integrality.When length growth rate is equal to or less than 35%, optical fiber 111, the easy branch of 111A.Yet when length growth rate was equal to or less than 10%, in next process of making optical cable, optical fiber broke, thereby state can not be kept perfectly.Correspondingly, breaking elongation is equal to or less than 35% and to be equal to or greater than 10% be favourable.
In order to prepare the ultraviolet curable resin that blending has above-mentioned Young modulus, the addition of molecular weight that can be by reducing oligomer or the bisphenol a diacrylate by increasing bi-functional monomer such as oxirane modification etc., and increase Young modulus.
Further, in the blending of carrying out resin so that resin when having above-mentioned breaking elongation, by increasing the molecular weight of glycol in the oligomer such as PTMG etc., or the addition of the bisphenol a diacrylate by reducing bi-functional monomer such as oxirane modification etc., breaking elongation might be increased.
Even when satisfying this condition, when the loss when in optical fiber 111,111A branch was big, optical cable was not suitable as product.That is to say, when the loss increase when branch becomes greater than 1.0dB, might interrupt communication.Correspondingly, to be equal to or less than the fibre ribbon of 1.0dB be the fibre ribbon that can be used for charged branch in the loss increase during branch, and thereby be preferred.More preferably the loss during branch is equal to or less than 0.5dB.
At this, with the identical mode of being explained in conjunction with the above-mentioned first embodiment fibre ribbon of measurement, carry out the measurement and the loss when optical fiber 111,111A branch of stretching breaking elongation in yield point stress, Young modulus and position and measure.
It is favourable that the mode field diameter that optical fiber 111,111A define according to Petermann-I under wavelength 1.55 μ m is equal to or less than 10 μ m.Simultaneously, to be equal to or less than 1.26 μ m be favourable to the cable cut-off wavelength of the glass fibre 113 of optical fiber 111,111A, 113A.LP when cable cut-off wavelength is illustrated in 22m length
11The cutoff wavelength of pattern and be the value littler than 2m cutoff wavelength.
Further, for glass fibre 113, the 113A of optical fiber 111,111A, the macrobending loss when wavelength 1.55 μ m and bending diameter 15mm is set at the value that is equal to or less than the 0.1dB/ circle.By before enclosing around windings optical fiber such as metal bar tens and the difference of loss afterwards obtain macrobending loss divided by the number of turns.
As mentioned above, fibre ribbon 110 of the present invention, 110A have the following advantages: the polarisation mode dispersion (PMD) under the loose coiling state becomes and is equal to or less than 0.2ps/km
1/2Further, fibre ribbon 10 of the present invention also has the following advantages: the PMD that constitutes the optical fiber of fibre ribbon after optical fiber 111,111A form optical cable becomes 0.2ps/km
1/2Because it is thinner to cover optical fiber 111, the sheath 112 of 111A, 112A, thereby fibre ribbon is crooked easily.Owing to have recessed portion 116,116A, therefore, fibre ribbon is crooked easily on Width, and the anisotropy of the curing shrinkage internal stress of sheath is also less.Correspondingly, even when fibre ribbon forms with loose coiling state, do not act on too much external force yet, and can reduce PMD.Because the long Distance Transmission of PMD influence, therefore, but show the fibre ribbon executive chairman Distance Transmission of little PMD.
On the other hand,, it has been generally acknowledged that it is the sheath coating covering of 25-40 μ m that all optical fiber are all used thickness for the correlation technique banded structure.It is believed that when coating is solidified, keep stress etc. and the strain that causes in optical fiber, wherein, described stress produces because of cure shrinkage, thereby, polarisation mode dispersion increased.
Here, for the method for after fibre ribbon forms optical cable, measuring polarisation mode dispersion (PMD), can enumerate reference test method (RTM) and alternately testing method (ATM).For RTM, can enumerate Jones-matrix (JME) method or Poincare spheroid (PS) method.On the other hand, for ATM, can enumerate polarized state (SOP) method, interference technique, fixed analyzer (FA) method etc.Under loose coiling state, use the polarisation mode dispersion of the optical fiber of said method measuring optical fiber band, wherein, preferred maximum is equal to or less than 0.2ps/km
1/2
Below, explain manufacture method according to fibre ribbon of the present invention.
Figure 15 is the key diagram that illustrates according to the manufacture method of fibre ribbon 110 of the present invention, 110A.In feeding mechanism 100 inside, arrange spool 121a-121d, unsteady roller 122a-122d and guide roller 123. Optical fiber 111a, 111b, 111c, 111d are wrapped in respectively on spool 121a, 121b, 121c, the 121d.These optical fiber are corresponding with the optical fiber 111, the 111A that explain in conjunction with fibre ribbon shown in Figure 11 A and the 13A.Here, although make an explanation according to the example that uses 4 optical fiber to make fibre ribbon, the quantity of optical fiber is not limited to 4.
Send optical fiber 111a, 111b, 111c, 111d to from spool 121a, 121b, 121c, 121d respectively, and unsteady roller 122a, 122b, 122c, 122d act on the tension force of tens gf on optical fiber 111a, 111b, 111c, 111d.As optical fiber 111a, 111b, when 111c, 111d pass through guide roller 123, on an arrayed surface, arrange optical fiber 111a, 111b, 111c, 111d.Further, optical fiber 111a, 111b, 111c, 111d further assemble by overhead guide roller 124, and are fed to applying device 126.Applying device 126 comprises nozzle 125, mould 127.The optical fiber 111a-111d that is fed to applying device 126 is guided by nozzle 125, and is set at desirable layout.
As shown in figure 16, nozzle 125 has oval wire hole 125a.For the size of wire hole 125a, the quantity of supposing optical fiber 111,111A is N (is 4 at this), and width W n and thickness T n use following formulate respectively.
External diameter * the N+0.03 to 0.08mm of Wn=optical fiber
When fiber arrangement must contact with each other, preferably set the external diameter * N+0.03 to 0.05mm of Wn=optical fiber.
Thickness T n is preferably set to the external diameter of formula Tn=optical fiber+0.005 and represents to 0.01mm.
In applying device 126, arrange mould 127 shown in Figure 17.Mould 127 is provided with the slotted eye 127a that passes 4 optical fiber 111a, 111b, 111c, 111d with the way of contact.
The diameter Dd of the hole 127a of preferred mold 127 is set at external diameter+0.005 of Dd=optical fiber to 0.05mm.Further, the width W d of the hole 127a of mould 127 is set at Wd=Dd * N.The outshot 127b that forms between adjacent fiber 111,111A is corresponding with recessed portion 116 and the recessed portion 116A among Figure 13 A among Figure 11 A.The end of preferred outshot 127b is set to such an extent that satisfy formula (T-d)/2/Y≤4.0.Further, in Figure 13 A, outshot 127b always is positioned at the inside of the common tangent S2A of adjacent fiber 111A.More specifically, the distance L d between the end of outshot 127b is corresponding at the thickness g of sheath recess office with fibre ribbon.Based on fibre ribbon in the design of the thickness g of sheath recess office and setpoint distance Ld, as for the value, the value that is equal to or less than 1.0d that are equal to or less than 200 μ m, be equal to or less than 0.8d (value of optical fiber external diameter-0.05mm), or the like.
Here, because mould 127 is made specially by the line electrodischarge machining, therefore, it is bigger than linear diameter at least that distance L d becomes.Distance L d minimum is about 0.05 to 0.08mm.Further, in addition when optical fiber 111 contacts with outshot 127b, for the end that prevents outshot 127b damages optical fiber 111, for example, with the end of smooth curve shape such as R (circle) formation outshot 127b.When forming outshot 127b terminal towards the inner outstanding bowed shape of band, radius of curvature R is preferably about 0.02-0.05mm.
At optical fiber 111a, 111b, when 111c, 111d arrive applying device 126,4 optical fiber 111a, 111b, 111c, 111d in one plane are arranged in parallel with the state that they contact with each other, wherein, around optical fiber 111a, 111b, 111c, 111d, apply ultraviolet curable resin.Provide ultraviolet curable resin from pressure resin container 128.In order on 4 optical fiber 111a, 111b, 111c, 111d, to apply ultraviolet curable resin, with ultraviolet lamp 129 irradiation ultraviolet radiations, so that ultraviolet curable resin is solidified.The ultraviolet curable resin that solidifies forms sheath 112,112A, thereby, form 4-fiber optic band 110,110A.
By the fibre ribbon 110 that solidifies from ultraviolet lamp 129 irradiation ultraviolet radiations by guide roller 130, loosen capstan winch 131 and the Winding Tension Controlling roller 132 that floats and be fed to collecting device 133.In collecting device 133, fibre ribbon 110,110A are wound on the spool 133b by angle sheave 133a.At this, the winding tension of whole fibre ribbon is set at tens gf-hundreds of gf.
As mentioned above, according to the method for making fibre ribbon, these optical fiber that under the state that 4 optical fiber 111a, 111b, 111c, 111d contact with each other, are arranged in parallel, and, on the outside of optical fiber 111a, 111b, 111c, 111d, form sheath 112,112A, so that these optical fiber become integral body.Between adjacent fiber 111,111A, form recessed portion 116,116A.Since the maximal value of ribbon thickness be set at from fibre diameter in scope than the value of the big 40mm of fibre ribbon diameter, therefore, each optical fiber 111 easy branches (charged branch).When fibre ribbon 110,110A satisfy relevant formula (T-d)/2/Y≤4.0, can further strengthen branch's character.When sheath 112A formed to such an extent that make recessed portion 116A be no more than the common tangent of adjacent fiber 111, PMD strengthened.
Here, in the said method of making fibre ribbon, make an explanation at the situation that 4 optical fiber 111a, 111b, 111c, 111d are arranged in parallel and integral body forms oversheath 112,112A on the outside of these optical fiber.Except these structures, also might apply ultraviolet curable resin respectively separately to 4 optical fiber 111a, 111b, 111c, 111d, subsequently, 4 optical fiber 111a, 111b, 111c, 111d arrange adjacent to each otherly, then solidify sheath 112,112A.
That is to say, as shown in figure 18, make 4 optical fiber 111a, 111b, 111c, 111d by applying device 126.Applying device 126 uses mould 140 shown in Figure 19.In mould 140, arrange wire hole 140a separately, and ultraviolet curable resin is coated to respectively on each optical fiber 111a, 111b, 111c, the 111d.Subsequently, use is arranged on the guide roller that is used to assemble 141 in ultraviolet lamp 129 downstreams, 4 optical fiber 111a, 111b, 111c, 111d become row adjacent to each other in ultraviolet lamp 129 internal placement, and pass through irradiation ultraviolet radiation and whole these optical fiber that form.Here, the resin extruded between the adjacent fiber is around optical fiber, thereby optical fiber contacts with each other.Be coated to amount of resin on each optical fiber by adjusting, between adjacent fiber 111,111A, form recessed portion 116,116A, subsequently, cured resin.
For other structure,, and omit their explanation because they are identical with the structure of explaining in conjunction with Figure 15, thereby indicate the parts of same function with identical symbol.
In addition, in making the method for fibre ribbon, in the mode identical with said circumstances, fibre ribbon 110,110A dispose to such an extent that make each optical fiber 111, the easy branch of 111A.Further, they show less PMD.
Here, be not limited to the foregoing description, can make suitable modification and improvement according to fibre ribbon of the present invention and manufacture method thereof.
(experiment)
Below explain and have several particular experiment of the fibre ribbon of constructing shown in Figure 13 A.Use each all to have 250 μ m external diameters and comprise protective finish 114A and 4 optical fiber of color layer 115A as optical fiber 111A, make fibre ribbon 110A.For carrying material, use ultraviolet curable resin.For ultraviolet curable resin, for example use with based on the oligomer of urethane acrylate resin as the basis, wherein, this oligomer for example is the multipolymer of PTMG (poly-tetramethylene ethylene glycol), TDI (cresylene diisocyanate) and HEA (hydroxy acrylic acid ethyl ester).For the diluting monomer that is used for the carrying material resin, use the bisphenol a diacrylate of interpolation-vinyl-pyrrolidone, ethylene oxide,1,2-epoxyethane modification and the resin of the light parent material of Irugacure 184 conducts.Change Young modulus and length growth rate by changing resin and resinous blending method.
It is that 1.04mm and thickness T n are the shape of 0.260mm that used nozzle 125 forms width W n by machining.It is that 0.260mm, width W d are that 1.04mm, distance L d are that 0.08-0.20mm and fibre ribbon are the shape of designated value at the thickness g of recessed portion 116A that mould 127 forms aperture Dd by machining.
Table 9 illustrates the first to the 11 result of experiment that satisfies above-mentioned various conditions.Here, the method that the manufacture method of first to the tenth experiment adopts associative list 4 to be explained, wherein, 4 optical fiber 111a, 111b, 111c, 111d are arranged in parallel toward each other, and under this state on these optical fiber common application of resin so that optical fiber becomes integral body.On the other hand, the 11 experiment is adopted in conjunction with the method that Figure 18 explained, wherein, resin is coated on each root of 4 optical fiber 111a, 111b, 111c, 111d, subsequently, and assembling optical fiber and become integral body.
[table 9]
| Sequence number | Thickness g between the optical fiber (μ m) | Thickness t (μ m) | The Young modulus of carrying material (MPa) | The length growth rate of carrying material (%) | Branch's character | The integrality of stranding | Loss during branch increases (dB) |
| Embodiment 1 | 150 | 5 | 200 | 25 | Good | Good | 0.2 |
| | 200 | ↑ | ↑ | ↑ | Good | Good | ↑ |
| Embodiment 3 | 80 | ↑ | ↑ | ↑ | Good | Good | ↑ |
| Embodiment 4 | 150 | 2 | ↑ | ↑ | Good | Good | ↑ |
| Embodiment 5 | ↑ | 10 | ↑ | ↑ | Good | Good | ↑ |
| Embodiment 6 | ↑ | 5 | 800 | ↑ | Good | Good | ↑ |
| Embodiment 7 | ↑ | ↑ | 500 | ↑ | Good | Good | ↑ |
| Embodiment 8 | ↑ | ↑ | 200 | 12 | Good | Good | ↑ |
| Embodiment 9 | ↑ | ↑ | ↑ | 30 | Good | Good | ↑ |
| | ↑ | ↑ | 200 | 25 | Good | Good | 0.05 |
| | ↑ | ↑ | ↑ | ↑ | ↑ | ↑ | 0.2 |
As shown in table 9, should be understood that in all experiments, when forming optical cable, might obtain the favourable outcome of branch's character and integrality.
Further, in first experiment, during the PMD of measuring optical fiber, PMD is 0.04ps/km after forming optical cable
1/2
Here, to the 9th experiment, using the mode field diameter under its 1.55 mum wavelength is that 9.8 μ m and cable cut-off wavelength are the optical fiber of 1.2 μ m in first experiment.In the tenth experiment, the mode field diameter of used optical fiber under 1.55 mum wavelengths is 7.6 μ m, and cable cut-off wavelength is 1.2 μ m.In the case, should be understood that loss in the time of further to reduce branch.
Explain the optical cable of use below in conjunction with Figure 20-Figure 38 according to fibre ribbon of the present invention.
At first, in conjunction with the optical cable of Figure 20-Figure 25 explanation according to first embodiment of the invention.
As shown in figure 20, in the fibre ribbon 201 of this embodiment, in spacer 203, hold a plurality of fibre ribbons 210 in the formed groove 204, wherein, have tensile strength body 202 in the central authorities of spacer 203.Optical cable 201 is 200 core pattern optical cables, and is wherein, stacked and hold 5 4-fiber optic bands 210 in each of ten grooves 204.Further, in a circumferential direction with ten grooves 204 of reverse manner spiralization alternately, keep the state that they are arranged in parallel in a longitudinal direction simultaneously.That is to say that spacer 203 is the SZ spacer.Further, the lay of groove 204 is 500mm.Here, the external diameter of spacer 203 for example is 12mm.
Further, come off from groove 204, around spacer 203, twine pressure coil 205, simultaneously, on the outside of pressure coil 205, form the sheath of making by plastics (as tygon) 206 for preventing fibre ribbon 210.The external diameter of sheath 206 for example is 16mm.
Further, tensile strength body 202 is for preventing that tensile strength is directly delivered to the tensile strength body that fibre ribbon 210 is provided with when tensile strength affacts on the optical cable 201, and for example, steel wire is as tensile strength body 202.
Because optical cable 201 has the periodically direction of reverse twist of groove 204, thereby, might easy reverse part take out fibre ribbon 210 by the arbitrary portion of removing sheath 206 and pressure coil 205 from groove 204.Correspondingly, using the optical cable 201 of SZ spacer is the structure that is suitable for intermediate column branch.
Here, explain the pattern that is contained in the fibre ribbon 210 in the groove 204.
For fibre ribbon 210, for example can use the fibre ribbon 210 shown in Figure 1A.That is to say that shown in Figure 1A, fibre ribbon 210 is configured to: many (for example the being 4 in this embodiment) optical fiber 11 that are arranged in parallel, and sheath 12 whole whole peripheries of the optical fiber 11 that is arranged in parallel and the whole length of optical fiber 11 of covering that are formed from a resin.
Further, because the sheath 12 that fibre ribbon 210 usefulness are formed from a resin covers optical fiber 11 on whole length of optical fiber 11, therefore, fibre ribbon 210 provides following structure: by disconnecting in any position or removing sheath 12, easily from any part branch simple optical fiber.
Further, for glass fibre 13, it is favourable that the mode field diameter (MFD) that defines according to Petermann-I under wavelength 1.55 μ m is equal to or less than 10 μ m.More preferably mode field diameter (MFD) is equal to or less than 8 μ m.
By reducing mode field diameter, might reduce microbending loss and macrobending loss.Correspondingly, the loss that might suppress to cause because of external force increases, and wherein, described external force is that fibre ribbon 210 bears in groove.Further, even, therefore, might carry out charged branch easily owing to loss increase when optical fiber 11 is crooked with small-bend radius is also less.
Utilization has the fibre ribbon 210 of thin sheath 12, might obtain optical cable 201 with low cost, in this optical cable, in high data density and mechanical property that the correlation technique optical cable that guarantees employing SZ spacer is had, be very easy on center section, take out fibre ribbons from fibre ribbon 210.
In this way, because the thickness t of the sheath 12 of fibre ribbon 210 is less, therefore, sheath 12 is peeled off in the manual operations by the operator or use branch's instrument to produce the crack and delaminate easily.Correspondingly, by peeling off sheath 12, make optical fiber 11 branches easily from fibre ribbon 210.That is to say that fibre ribbon 210 adopts the structure that can realize the intermediate column branch operation easily.
For above-mentioned intermediate column branching method, use the branching method of having explained in conjunction with Fig. 2 A-Fig. 2 C.
Here, shown in the table 10 because of the thickness of sheath 12 different in this operating process the relation between operability and the charged loss increase of intermediate column branch operation.Further, in table 10, be illustrated in the state polarisation mode dispersion (PMD) down of receiving optical fiber in the SZ spacer in the optical cable 201 and the separating experiment result who represents optical fiber integrality intensity.Here, the outside diameter d of the optical fiber in the fibre ribbon shown in the table 10 is 250 μ m.Further, the Young modulus of the resin of formation sheath 12 is 900MPa.
[table 10]
| Tape thickness T (μ m) | 250 | 251 | 260 | 270 | 275 | 280 | 290 | 300 | 310 | 320 |
| Jacket thickness t (μ m) | 0.0 | 0.5 | 5 | 10 | 12.5 | 15 | 20 | 25 | 30 | 35 |
| Intermediate column branch | Very good | Very good | Good | Good | Good | Good | All right | Bad | Bad | Bad |
| Charged loss increases | Good | Good | Good | Good | Good | All right | All right | Bad | Bad | Bad |
| SZ optical cable PMD | Good | Good | Good | Good | Good | All right | All right | All right | All right | All right |
| Being with or without optical fiber separates | Bad | Good | Good | Good | Good | Good | Good | Good | Good | Good |
Here, jacket thickness t is that 0.0 fibre ribbon represents that resin does not as shown in figure 10 cover the fibre ribbon of whole optical fiber in the table 10.
The branch of intermediate column shown in the table 10 character represents when the center section of fibre ribbon branches into each optical fiber, remains 1.0dB or the easy degree of branch more hour in the loss increase.For assessment level used in this instructions, " very good " means and can carry out branch within 2 minutes, " good " means and can surpass 2 minutes and carry out branch in running time in 3 minutes, and " all right " be then represented and can carry out branch above within 3 minutes and running time in 5 minutes.Further, " bad " expression branch need surpass 5 minutes average operating time.
Here, the fact that is equal to or less than 1.0dB of the loss increase during branch means and can carry out charged branch.
At this, explain and the relevant test of intermediate column branch character.
At first, shown in Figure 21 A, for fibre ribbon 210, under the state of the sheath that keeps the about 1m of length, the light source 220 that the light of permission wavelength 1.55 μ m incides among the first optical fiber 11a is connected to optical fiber 11a at an end of fibre ribbon 210, simultaneously, storage oscilloscope 222 and optical receiver 221 are connected to optical fiber 11a on the opposite side of fibre ribbon 210.Under this state, the light of wavelength 1.55 μ m incides on the first optical fiber 11a from light source 220.Incident light is sent to the opposite side of optical fiber 11a, and is received by receiver 221.Receive the reception light quantity of light with suitable number of times observation post by storage oscilloscope 222.
Then, shown in Figure 21 B, continue at the light of light source 220 to carry out the intermediate column branch of fibre ribbon 210 under the state of incident.That is to say that the first optical fiber 11a branches into single optical fiber (charged branch) from fibre ribbon 210 under electriferous state.Here, measure the loss recruitment (increment) that causes because of intermediate column branch by storage oscilloscope 222.
The length setting that carries out the fibre ribbon 210 of intermediate column branch is 50cm.Further, according to the step of being explained in conjunction with Fig. 2 A-2C, be used to carry out the method for intermediate column branch.
In the fibre ribbon shown in the table 10, the fibre ribbon that the intermediate column branch list reveals assessment " very good ", " good " and " all right " has 290 μ m or littler tape thickness, promptly satisfies T≤d+40 (μ m).All these fibre ribbons all can be finished intermediate column branch in 5 minutes, the loss increase during simultaneously branch is restricted to 1.0dB or littler.That is, might in 5 minutes, carry out charged branch.
On the contrary, for the correlation technique fibre ribbon with big jacket thickness, wherein, jacket thickness exceeds 40 μ m than the outside diameter d of optical fiber, and intermediate column branch character shows as " bad ".That is to say that the loss increment during branch surpasses 1.0dB, perhaps, even but branch optical fiber, but branch operation requires to surpass 5 minutes preset time, thereby, consider from real viewpoint, can not carry out charged branch.
Charged loss increase shown in the table 10 is illustrated in the loss recruitment (increment) that produces in the intermediate column branch operation process.For the assessment level in this instructions, " very good " means that the loss increase is no more than 0.1dB in the branch operation process, " good " means that the loss increase is no more than 0.5dB in the branch operation process, and " all right " means that then the loss increase is no more than 1.0dB in the branch operation process.Further, " bad " means that the added value of loss in the branch operation process surpasses 1.0dB.
In fibre ribbon shown in the table 10, the fibre ribbon that charged loss increases to assessment " good " and " all right " has 290 μ m or littler tape thickness, promptly satisfies T≤d+40 (μ m).All these charged fibre ribbons can be finished intermediate column branch, and the loss when limiting branch simultaneously increases to 1.0dB or littler.Particularly, be 275 μ m or littler fibre ribbon for tape thickness T, promptly for the fibre ribbon that satisfies T≤d+25 (μ m), charged loss increase shows as " good ", thereby the loss increase can further be suppressed to be lower level.Correspondingly, these optical fiber are preferred.
On the contrary, exceed the correlation technique fibre ribbon of 40 μ m for its tape thickness T than optical fiber outside diameter d, charged loss increase shows as " bad ".Further, in the branch operation process, the added value of loss surpasses 1.0dB.
The optical cable of SZ shown in the table 10 PMD represents to be in fibre ribbon 210 as shown in figure 20 and is contained in link polarisation mode dispersion in the state in the groove 204.Here, the link polarisation mode dispersion is represented the maximal value of the PMD that produces when the value of the polarisation mode dispersion (PMD) that is contained in all optical fiber 11 in the optical cable 201 being carried out a large amount of equivalent optical cable of statistical treatment parallel-series.Here, carry out statistical treatment based on Central Limit Theorem.Further, the length at optical cable 201 is to carry out the measurement of PMD under 1000m or longer and the condition of use based on the measuring equipment (6000B that is made by Suntec Inc) of interference technique.
For the assessment level in this instructions, " very good " means that link polarisation mode dispersion (PMD) is equal to or less than 0.05 (ps/km
1/2), " good " means that the link polarisation mode dispersion surpasses 0.05 (ps/km
1/2) and be equal to or less than 0.1 (ps/km
1/2), " all right " means that the link polarisation mode dispersion surpasses 0.1 (ps/km
1/2) and be equal to or less than 0.2 (ps/km
1/2), and " bad " means that the link polarisation mode dispersion surpasses 0.2 (ps/km
1/2).
In trough of belt type optical cable, fibre ribbon is arranged in the groove with overlapped way, thereby, produce the stress of fixed-direction, and in optical fiber, produce birefringence.Further, also because the cure shrinkage of the sheath of fibre ribbon also is easy to generate birefringence.The sheath of fibre ribbon (resin) shrinks about 5% because of the curing when it is made.Because this cure shrinkage, external force acts on the optical fiber, and produces stress in the inside of optical fiber.Yet fibre ribbon has on Width the shape of cross section of being widened, thereby, stress Width be different on thickness direction.Particularly, on the Width of the sheath on the ribbon thickness direction, form continuously at fibre ribbon with respect to fiber arrangement, thereby, when the thickness of the sheath on these parts is big, the stress that produces on Width increases, thereby the stress difference on Width and the thickness direction increases.
In this way, in trough of belt type optical cable, PMD increases easily.Particularly, for the optical cable that uses the SZ spacer, because the opposing slot shape, optical fiber is with the mode bending of complexity.Thereby, observe the trend that PMD increases easily.
In this embodiment, use the jacket thickness fibre ribbon thinner than correlation technique fibre ribbon, the birefringence that produces because of cure shrinkage can be suppressed to extremely little value.Correspondingly, the optical cable of this embodiment can suppress to be lower level to PMD.
In fibre ribbon shown in the table 10, when optical cable satisfied T≤d+25 (μ m), SZ optical cable PMD became " good ", thereby, should be understood that this optical cable is particularly advantageous.
Optical fiber shown in the table 10 separates and whether has the result who represents discrete testing, and this result represents the intensity of optical fiber integrality.
In this discrete testing, as shown in figure 22, the fibre ribbon 210 that constitutes tested object is wound on loose winding bobbin 224, and fibre ribbon 210 is sent into from loose winding bobbin 224, and is wound on the coiling bobbin 225, and, in the process of passing through, external force action on fibre ribbon 210.On fibre ribbon 210, apply fixedly tension force by constituting floating drum and weight of heavy loading component 226, and simultaneously, use the bar of two diameter 3mm on opposite direction, fibre ribbon 210 to be carried out the minor diameter bending, thereby produce the external force that affacts on the fibre ribbon 210.
For in this instructions, separating relevant assessment level with optical fiber, " good " means between optical fiber and sheath (resin) and do not separate, and fibre ribbon remains integral form in a longitudinal direction, and " bad " then means and cause part disconnected from each other between optical fiber and the sheath (resin).
In fibre ribbon shown in the table 10, when fibre ribbon satisfies when concerning T 〉=d+1 (μ m), the separation that does not produce fibre ribbon, thereby optical cable is favourable.That is to say discovery: when the thickness t of sheath was equal to or greater than 0.5 μ m, optical cable had enough intensity, so that each optical fiber becomes integral body.
In fibre ribbon shown in the table 10, satisfy and to concern that the fibre ribbon (referring to Figure 10) of T=d produces separating part in separating experiment.Yet, considering the external force that when making optical cable, in production line, reduces to affact on the fibre ribbon as squeezing the fact of drawing, might avoid the defective that band separates taking place in that optical fiber is formed in the manufacturing step of optical cable.Further, for satisfying the fibre ribbon that concerns T=d, owing in by the part on the ribbon thickness direction of each fiber optic hub, remove sheath basically, therefore, on the Width of fibre ribbon, peel off each optical fiber easily, thereby, compare with having the fibre ribbon that covers the shape of whole optical fiber with sheath, can more successfully carry out intermediate column branch.
For fibre ribbon 10A shown in Figure 10, wherein, resin 12aA does not cover whole optical fiber 11A, only uses the adhesion strength between resin 12aA and the optical fiber and makes each optical fiber 11A become integral body.On the contrary, for fibre ribbon shown in Figure 1A 10, intactly cover whole optical fiber 11 with the resin that constitutes sheath 12, thereby, the adhesion strength between resin and optical fiber, fibre ribbon 10 keeps whole fibre ribbons 10 to become the state of integral body because of the power that is tending towards keeping sheath 12 self shape easily.
Further, in above-mentioned fibre ribbon (referring to Figure 1A), by the ratio between the sum of products of the Young modulus E of the product of the Young modulus E of sheath (resin) and cross-sectional area S and each optical fiber 11 and cross-sectional area S is set at suitable value, can reduce PMD.Along with the Young modulus increase of the resin that constitutes sheath 12 and the thickness of sheath 12 increase, the stress intensity that acts on the optical fiber 11 when sheath 12 produces cure shrinkage increases.At this, the reason that causes PMD to increase is the strain that produces in the glass fibre 13 of optical fiber 11.Based on determining the strain size by the stress intensity of overlay arrival glass fibre 13 and the Young modulus of glass fibre 13, wherein, described overlay comprises main protection coating 14, auxiliary protection coating 15 and color layer.
Then, when the thickness T of fibre ribbon 210 not simultaneously, that is, and when the thickness of sheath 12 not simultaneously, Young modulus at sheath 12 is respectively under each condition of 700MPa, 900MPa, 1200MPa and 1500MPa, the ES product ratio of examination sheath 12 and optical fiber 11 and the relation between the SZ optical cable PMD.
Here, glass fibre 13 has the Young modulus of 73000MPa and the external diameter of 125 μ m.Main protection coating 14 has the Young modulus of 1MPa and the external diameter of 200 μ m.Auxiliary protection coating 15 has the Young modulus of 700MPa and the external diameter of 240 μ m.Color layer has the Young modulus of 1500MPa and the external diameter of 250 μ m.
Shown in the table 11 when the Young modulus of sheath 12 is 700MPa the ES product than and SZ optical cable PMD between relation.
[table 11]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 10.264 | 10.789 | 12.014 | 12.889 | 13.764 | 14.639 | 16.389 |
| ES product ratio | 0.0113 | 0.0118 | 0.0132 | 0.0141 | 0.0151 | 0.160 | 0.0180 |
| SZ optical cable PMD | Good | Good | Good | Good | Good | All right | All right |
Shown in the table 12 when the Young modulus of sheath 12 is 900MPa the ES product than and SZ optical cable PMD between relation.
[table 12]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 13.196 | 13.871 | 15.446 | 16.571 | 17.696 | 18.821 | 21.071 |
| ES product ratio | 0.0145 | 0.0152 | 0.0169 | 0.0182 | 0.0194 | 0.0206 | 0.0231 |
| SZ optical cable PMD | Good | Good | Good | Good | Good | All right | All right |
Shown in the table 13 when the Young modulus of sheath 12 is 1200MPa the ES product than and SZ optical cable PMD between relation.
[table 13]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 17.595 | 18.495 | 20.595 | 22.095 | 23.595 | 25.095 | 28.095 |
| ES product ratio | 0.0193 | 0.0203 | 0.0226 | 0.0242 | 0.0259 | 0.0275 | 0.0308 |
| SZ optical cable PMD | Good | All right | All right | All right | All right | Bad | Bad |
Shown in the table 14 when the Young modulus of sheath 12 is 1500MPa the ES product than and SZ optical cable PMD between relation.
[table 14]
| Tape thickness T (μ M) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 21.994 | 23.119 | 25.744 | 27.619 | 29.494 | 31.369 | 35.119 |
| ES product ratio | 0.0241 | 0.0253 | 0.0282 | 0.0303 | 0.0323 | 0.0344 | 0.0385 |
| SZ optical cable PMD | All right | All right | Bad | Bad | Bad | Bad | Bad |
Here, the optical fiber ES product shown in the table 11-table 14 be the zone that constitutes by glass fibre 13, main protection coating 14, auxiliary protection coating 15 and color layer each ES product and, and resin ES product is the ES product of sheath 12.ES product ratio can be expressed as " resin ES product/optical fiber ES product ".
As show as shown in the 11-table 14, SZ optical cable PMD obtains the condition of " good " or " all right ", that is and, the link PMD that is contained in whole fibers of the optical fiber in the optical cable with SZ spacer is 0.2 (ps/km
1/2) condition be the ES product than for being equal to or less than the situation of 0.026 value.Further, SZ optical cable PMD obtains the condition of " very good ", that is, the link PMD that is contained in whole fibers of the optical fiber in the optical cable with SZ spacer is 0.1 (ps/km
1/2) condition be the ES product than for being equal to or less than the situation of 0.020 value.
In this way, be set at designated value, might suppress to be lower level to the PMD of optical fiber 11 by ES product ratio sheath 12 and optical fiber 11.
Further, for being contained in, can enumerate the fibre ribbon 110 shown in Figure 11 A according to the fibre ribbon in the optical cable of first embodiment of the invention 210.That is to say that for fibre ribbon 210, in sheath 12, and the recess that forms as one man forms recessed portion 16 between the adjacent fiber 111,111.In the sheath 12 that covers optical fiber 111, recessed portion 116 comprises base section 117, and wherein, base section 117 is the parts with maximum recess.
As mentioned above, from reducing the viewpoint of PMD, the thickness of the sheath that forms on around the optical fiber 111 is preferably less, and more preferably the thickness of sheath 12 is about 0.5 μ m.Yet, when reality is made this fibre ribbon, preferably guarantee a certain size thickness.Reason is, when attempting to make the resin that constitutes sheath thin, might the part application of resin (this phenomenon is called " resin deficiency ") not.Correspondingly, for optical fiber 111, being preferably formed thickness is 2.5 μ m or bigger sheath.In the case, for reducing the amount of resin on the ribbon thickness direction and guaranteeing the jacket thickness of appointment simultaneously, can reduce the sheath that between the recess of adjacent fiber, forms.The part that is easy to take place the resin deficiency is that the optical fiber external diameter has peaked part on the ribbon thickness direction, thereby the minimizing of amount of resin does not hinder the reliable coating of resin between the adjacent fiber.
Correspondingly, the formation of recessed portion 116A shown in Figure 11 A can suppress the increase of PMD, prevents the resin deficiency simultaneously.
Further, the recessed portion 116 that forms in sheath 112 is being effective by peeling off sheath 112 from fibre ribbon 210 during to optical fiber 111 branches.The quantity of the part that sheath 112 approaches is big more, the just fracture of easy more generation sheath 112, thereby, carry out branch operation easily.Further, owing to carry out branch operation easily, in the branch operation process, can make the external force that affacts on the optical fiber less, thereby charged branch loss increase can be suppressed to minimum.
In fibre ribbon 110 shown in Figure 11 A, the degree of depth Y of recessed portion 116 sets shortlyer than the distance between the common tangent S2 of the common tangent S1 of sheath 112 and each optical fiber 111.That is to say that recessed portion 116 forms to such an extent that make the location arrangements of base section 117 outside the common tangent S2 of each optical fiber 111.
Further, might use fibre ribbon 110A shown in Figure 13 A, wherein, fibre ribbon 110A changes another embodiment that the structure of fibre ribbon 110 shown in Figure 11 A obtains by the part.
In Figure 13 A, the sheath 112A that covers optical fiber 111A periphery form with adjacent fiber 111A between consistent being recessed into or bellows-shaped of institute's recess that forms.In the case, the recessed portion 116A that forms in sheath makes deeplyer than recessed portion shown in Figure 11 A 116.That is to say that fibre ribbon 110A forms to such an extent that make the base section 117A of recessed portion 116A be positioned at the inboard of the common tangent S2A of optical fiber 111A.
Here, during the receiving optical fiber band,, different in groove shown in Figure 20 to the distance at spacer center at the optical fiber of fiber bandwidth degree direction end with between the optical fiber of last fibre ribbon inside.Correspondingly, be contained at optical fiber under the state of spiral slot inside,, between end optical fiber and internal optical fiber, produce length difference in the inside of groove, thereby, stress in optical fiber, produced.This stress applies anisotropic stress with the stress that produces by optical fiber in the curved slot to glass fibre, thereby, produce birefringence, and this becomes the reason that PMD increases.
On the contrary, in fibre ribbon 110A shown in Figure 13 A, in sheath, form recessed portion, thereby as shown in figure 14, fibre ribbon 110A is easy deflection on Width.Correspondingly, when fibre ribbon 110A is contained in the groove, fibre ribbon 110A is not applied excessive power, thereby, solve the length difference that between end optical fiber and internal optical fiber, produces in the inside of groove, think thus and can improve optical cable PMD.Further, the sheath 112A of fibre ribbon 110A is approximately circular along the periphery of optical fiber 111A, thereby the anisotropy of the curing shrinkage internal stress among the sheath 112A that can reduce to take place when making fibre ribbon 110A is thought the PMD of the fibre ribbon 110A that can further reduce to be in the optical cable state thus.At this, this advantageous effects also obtains by fibre ribbon shown in Figure 11 A 110, and the fibre ribbon 110A with darker recessed portion can show advantageous effects more significantly.
Here, for the degree of depth of the recessed portion that in sheath shown in Figure 11 and Figure 13 A, forms, examination: by being arranged in parallel multifiber and by they being become prevent when integral body is made fibre ribbon optical fiber from separating; Prevent that when carrying out the fitting operation of fibre ribbon sheath from peeling off (becoming the reason that optical fiber separates); The perhaps increase of loss or reduce in favourable branch operation or charged branching process.As a result, find that recessed portion forms to such an extent that to make recessed portion be no more than the common tangent that is formed by adjacent fiber be preferred.That is to say, find than common tangent more a side of the inside to form recessed portion be favourable.
Following specific explanations examination result.
Be set at the situation of 270 μ m, 280 μ m and 290 μ m for the thickness T (μ m) of fibre ribbon, calculate asynchronous ratio t/Y of degree of depth Y (μ m) and ratio g/d when recessed portion, and, examine the intermediate column branch character under the various situations, charged loss increase and SZ optical cable PMD, wherein, ratio t/Y is the thickness t (μ m) of sheath and the ratio of the degree of depth Y (μ m) of recessed portion, and ratio g/d is that fibre ribbon is at the ratio of the thickness g of recess office (μ m) with the outside diameter d (μ m) of optical fiber.
Shown in the table 15 when the thickness T of fibre ribbon is 270 μ m intermediate column branch character, charged loss increase and SZ optical cable PMD between relation.Here, the ratio in form (T-d)/2Y is the equivalence value of t/Y.
[table 15]
| Tape thickness T (μ m) | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 |
| Jacket thickness t (μ m) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| (T-d)/ | 10 | 5 | 2 | 1 | 0.5 | 0.333 | 0.25 | 0.2 | 0.1 |
| Ratio (g/d) | 1.072 | 1.064 | 1.04 | 1 | 0.92 | 0.84 | 0.76 | 0.68 | 0.28 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | Good | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good |
| SZ optical cable PMD | Good | Good | Good | Good | Good | Good | Very good | Very good | Very good |
Shown in the table 16 when the thickness T of fibre ribbon is 280 μ m intermediate column branch character, charged loss increase and SZ optical cable PMD between relation.
[table 16]
| Tape thickness T (μ m) | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 |
| Jacket thickness t (μ m) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/ | 15 | 7.5 | 3 | 1.5 | 0.75 | 0.5 | 0.375 | 0.3 | 0.15 |
| Ratio (g/d) | 1.112 | 1.104 | 1.08 | 1.04 | 0.96 | 0.88 | 0.8 | 0.72 | 0.32 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | Good | Very good | Very good | Very good | Very good | Very good |
| SZ optical cable PMD | All right | All right | All right | All right | Good | Good | Very good | Very good | Very good |
Shown in the table 17 when the thickness T of fibre ribbon is 290 μ m intermediate column branch character, charged loss increase and SZ optical cable PMD between relation.
[table 17]
| Tape thickness T (μ m) | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 |
| Jacket thickness t (μ m) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/2Y | 20 | 10 | 4 | 2 | 1 | 0.667 | 0.5 | 0.4 | 0.2 |
| Ratio (g/d) | 1.152 | 1.144 | 1.12 | 1.08 | 1 | 0.92 | 0.84 | 0.76 | 0.36 |
| Intermediate column branch character | All right | All right | Good | Good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | All right | All right | All right | All right | All right | All right |
| SZ optical cable PMD | All right | All right | All right | All right | Good | Good | Good | Very good | Very good |
As show shown in the 15-table 17, intermediate column branch character, charged loss increase and any of SZ optical cable PMD in, the degree of depth Y of recessed portion is big more, just obtains favourable more result.
Further, when the thickness T of fibre ribbon is 270 μ m or 280 μ m, that is, when the thickness T of fibre ribbon satisfies T≤d+30 (μ m), increase, might obtain particularly advantageous result for intermediate column branch character, charged loss.Reason is: when the branch instrument that uses shown in Figure 12 A-Figure 12 C, because the advantageous effects of recessed portion is improved branch's character than the fibre ribbon that only reduces jacket thickness.For example, though when as shown in table 10, when tape thickness T is set at 270 μ m, being evaluated as of intermediate column branch character " good ", still, when shown in table 16, when the degree of depth Y that tape thickness is set at 280 μ m and recessed portion is set at 5 μ m, being evaluated as of intermediate column branch character " very good ", thereby, can confirm the advantageous effects of recessed portion.
Further, pay close attention to intermediate column branch character, especially the value with ratio (T-d)/2Y is relevant to should be understood that intermediate column branch character.For example, when ratio (T-d)/when 2Y is equal to or less than 4, might obtain favourable intermediate column branch character.
Further, pay close attention to SZ optical cable PMD, especially the value with ratio g/d is relevant to should be understood that SZ optical cable PMD.For example, when ratio g/d is equal to or less than 1.0, that is, in the time of within base section is positioned at common tangent, might obtains significant PMD and suppress effect, reduce amount of resin simultaneously fully.
When ratio g/d was equal to or less than 1.0, sheath was thinner, be arranged in outside the common tangent to prevent base section, thereby, sheath is crooked in a longitudinal direction easily, and simultaneously, recessed portion is darker, thereby, be easy to generate deflection shown in Figure 14, think thus and can suppress optical cable PMD effectively.
Further, when ratio g/d is equal to or less than 0.8, can further effectively be suppressed at optical fiber and be contained in PMD under the state in the spacer.
In the general coating of optical fiber, around glass fibre, cover main protection coating with low Young modulus, and, with the periphery of auxiliary protection coating with high Young's modulus and color layer covering main protection coating.The external diameter of main protection coating further, approximately is 0.8 times of thickness of optical fiber outside diameter d.Then, when the resin in the recessed portion had been no more than in the scope of main protection coating, sheath was easily deformable, thereby, be easy to generate deflection shown in Figure 14.Correspondingly, can further suppress PMD.
In fibre ribbon, wish to form the recessed portion of sheath with level and smooth curved shape R with recessed portion shown in Figure 11 A and Figure 13 A.This be because: for example, when the base section of recessed portion when the shape of fibre ribbon forms with sharp shape, stress concentrates on the base section of recessed portion, thereby, be easy to generate fracture and crackle.
Further, at the fibre ribbon that is used for optical cable of the present invention shown in Figure 1A, Figure 10, Figure 11 A and Figure 13 A, the loss that the adhesion strength between optical fiber and the sheath influences when carrying out charged branch sometimes increases and hot line job efficient.For the adhesion strength of optical fiber and sheath (resin), consider to prevent that loss from increasing and branch's operability that the adhesion strength of every optical fiber is favourable in the scope of 0.245 (mN)-2.45 (mN).When above-mentioned adhesion strength than above-mentioned scope more hour, can cause following situation: sheath fracture when forming optical cable, and optical fiber is disconnected from each other.On the other hand, when adhesion strength was bigger than above-mentioned scope, branch's character descended.
Here, use is above in conjunction with Fig. 5 and the method measuring optical fiber of Fig. 6 explanation and the adhesion strength between the sheath.
In the used fibre ribbon of the present invention, when fundamental purpose of the present invention is a being kept perfectly property of optical fiber and when not separating mutually, it is favourable that the thickness of sheath is equal to or greater than 0.5 μ m.In the case, the maximum ga(u)ge T of fibre ribbon becomes T 〉=optical fiber outside diameter d+1 (μ m).
In addition, in some cases, according to the character of the sheath of fibre ribbon, the loss during the charged branch of these property effects increases and branch operation efficient.Preferably as the yield point stress of sheath material character in the scope of 20MPa-45MPa.This is because carry out easily branch operation, and can be suppressed at the loss when carrying out charged branch.According to JIS K7113, under 50mm/ minute draw speed, measure the yield point stress of No. 2 sample.When yield point stress during less than 20MPa, following situation appears: the assembling optical fiber band with the step that forms optical cable in, each optical fiber separates because of the external force that affacts on the optical fiber, thereby, can not form optical fiber.On the other hand, when yield point stress surpasses 45MPa, be difficult to make sheath to break, thereby, the intermediate column branch that is difficult to carry out fibre ribbon.
Further, in this embodiment, for optical cable 201 shown in Figure 20, loss value when measuring wavelength 1.55 μ m and polarisation mode dispersion (PMD) value.Further, measure the increase (increment) of loss when carrying out intermediate column branch.
Here, fibre ribbon is the fibre ribbon 110A shown in Figure 13 A as used herein, and the thickness T of fibre ribbon 110A is 260 μ m.The outside diameter d of fibre ribbon 110A is 250 μ m.Further, the thickness t of sheath is 5 μ m, and the degree of depth Y of recessed portion is 30 μ m.The thickness g of fibre ribbon in the recess office is 200 μ m.
Yet, in being integrated into the optical fiber of fibre ribbon, from the optical fiber that meets G652, select 100 fibers, and 100 remaining fibers have the mode field diameter that is equal to or less than 10 μ m.
For the loss value that is in the optical fiber under the state that is contained in the optical cable 201, the optical fiber that meets G652 shows the maximal value of 0.23dB/km and the mean value of 0.21dB/km, simultaneously, its mode field diameter is that 10 μ m or littler optical fiber show the maximal value of 0.21dB/km and the mean value of 0.20dB/km.
Further, for the polarisation mode dispersion value, the optical fiber that meets G652 has 0.025 (ps/km
1/2) mean value, 0.020 (ps/km
1/2) standard deviation and 0.046 (ps/km
1/2) link PMD, simultaneously, its mode field diameter is that 10 μ m or littler optical fiber have 0.022 (ps/km
1/2) mean value, 0.018 (ps/km
1/2) standard deviation and 0.042 (ps/km
1/2) link PMD.
In this way, for loss after optical fiber forms optical cable and PMD, its mode field diameter is that 10 μ m or littler optical fiber show more favourable characteristic.
Further, as mentioned above, adopt the optical cable of SZ spacer to show favourable intermediate column branch character.Correspondingly, in many cases, this optical cable is as in the subscriber-system communication path that is connected between radio station and the ordinary subscribers.Correspondingly, in many cases, adopt the length of optical cable of SZ spacer shorter than the optical cable of the relay system that is used to connect the radio station, and the longest be tens km.Yet, when from the radio station when a subscriber distributes an optical fiber, under the bigger situation of subscriber's quantity, it is essential that the optical cable that can hold a large amount of optical fiber becomes, thereby optic cable diameter becomes large-sized.This situation is disadvantageous when optical cable is installed in pipeline.Correspondingly, wavelength division multiplexed (WDM) technology of signal of the many subscribers of stack is effectively in an optical fiber, and, but need a kind of optical cable of high-speed transfer signal strongly.
With the same in situation according to optical cable of the present invention, when link PMD is equal to or less than 0.2 (ps/km1/2), be under the situation of 400Gbps in transfer rate, but transmission range become 156km, thereby, might guarantee enough amount of communications to the subscriber system.
Further, be equal to or less than 0.1 (ps/km when linking PMD
1/2) time, be under the situation of 40Gbps in transfer rate, but transmission range become 625km, and, be under the situation of 80Gbps in transfer rate, but transmission range becomes 156km, thereby be preferred.
Here, explain by carrying out the method that loss is measured by intermediate column branch in conjunction with Figure 23 from optical cable.
At first, as shown in figure 23, in fibre ribbon arbitrarily, the light source 220 that allows the light of wavelength 1.55 μ m to incide among the first optical fiber 11a is connected to optical fiber 11a at an end of optical cable 201, simultaneously, optical receiver 221 is connected optical fiber 11a with storage oscilloscope 222 on the opposite side of optical cable 201.Under this state, the light of wavelength 1.55 μ m incides on the first optical fiber 11a from light source 220.Incident light is sent to the opposite side of optical fiber 11a, and is received by receiver 221.Receive the reception light quantity of light with suitable number of times observation post by storage oscilloscope 222.
Then, light at light source 220 continues under the state of incident, remove the length of sheath and the about 500mm of pressure coil at the center section of optical cable 201, spacer 203 bending in distortion, and, take out fibre ribbon 10c from groove, wherein, fibre ribbon 10c comprises by the optical fiber 11a of light source 220 incident lights.Then, fibre ribbon 10c branches into a plurality of simple optical fibers, and cuts the 4th optical fiber 11b.Here, carry out the method that is used for fibre ribbon 10c branch according to above step in conjunction with Fig. 2 A-2C explanation.
By range of observation is to remove sheath until the step of finishing the operation of using storage oscilloscope 222 from optical cable 201, and carries out the measurement of loss.
As a result, for the optical fiber that meets G652, unidentified 1.0dB or bigger loss increase, and simultaneously, are equal to or less than the optical fiber of 10 μ m for its mode field diameter, and unidentified 0.5dB or bigger loss increase.
Further, the mode with identical with above-mentioned optical cable 201 experimentizes to another pattern according to optical cable of the present invention.
Although optical cable 201 shown in Figure 20 is the optical cables with SZ spacer, but, for having the 200-fibrous type optical cable (not shown in FIG.) of the spacer of distortion in one direction, loss value when measuring wavelength 1.55 μ m and polarisation mode dispersion (PMD) value.Further, measure the recruitment (increment) of loss when carrying out intermediate column branch.
Optical cable as experimental subjects is substantially equal to its xsect optical cable 201 as shown in figure 20, and wherein, the diameter of spacer is that the diameter of 12mm and sheath is 16mm.Be arranged in central authorities the tensile strength body make by steel wire, and, ten grooves under the state of layout parallel to each other, spiralization in one direction in a longitudinal direction.The direction of twist of groove is that a left side is turned round, and lay is 500mm.
Here, fibre ribbon equals the fibre ribbon of above-mentioned optical cable 201 as used herein.Yet whole 200 optical fiber are formed by the optical fiber that meets G652.
For the loss value under the state of optical fiber in being contained in optical cable 201, optical fiber shows the maximal value of 0.22dB/km and the mean value of 0.20dB/km.Further, for the polarisation mode dispersion value, mean value is 0.027 (ps/km
1/2), standard deviation is 0.021 (ps/km
1/2), and link PMD is 0.048 (ps/km
1/2).
Further, in the similar intermediate column branches experiment of basic and above-mentioned optical cable 201, unidentified 1.0dB or bigger loss increase.
Further, the mode with identical with above-mentioned optical cable 201 experimentizes to another pattern according to optical cable of the present invention shown in Figure 24.
Although optical cable 201 shown in Figure 20 is the 200-fiber optic cables with SZ spacer,, optical cable shown in Figure 24 is to have the 1000-fiber optic cable 201a of the groove of distortion in one direction.For optical cable 201a, loss value when measuring wavelength 1.55 μ m and polarisation mode dispersion (PMD) value.Further, measure the recruitment (increment) of loss when carrying out intermediate column branch.
In the optical cable 201a as experimental subjects, the diameter of spacer 203a is that the external diameter of 23mm and sheath 206d is 28mm.Be arranged in central authorities the tensile strength body make by seven helically twisted steel wire 202a, and, 13 groove 204a under the state of layout parallel to each other, spiralization in one direction in a longitudinal direction.In 13 groove 204a, in each groove of 12 grooves, hold ten fibre ribbon 210d with overlapped way, simultaneously, in forming the littler groove 204a of residue of the degree of depth, hold five fibre ribbon 210d with overlapped way.The direction of twist of groove 204a is that a left side is turned round, and lay is 500mm.
Here, each the fibre ribbon 210d that is contained among the optical cable 210a is 8-fiber optic band 210d shown in Figure 25.Make this 8-fiber optic band 210d by changing the 4-fiber optic band 110A shown in Figure 13 A.Further, in the 1000-fiber optic of holding, the 500-fiber optic is formed by the optical fiber that meets G652, and remaining 500-fiber optic is formed by the optical fiber that mode field diameter is equal to or less than 10 μ m.
For the loss value under the state of optical fiber in being contained in optical cable 201a, the optical fiber that meets G652 shows the maximal value of 0.22dB/km and the mean value of 0.20dB/km, simultaneously, its mode field diameter optical fiber of being equal to or less than 10 μ m shows the maximal value of 0.21dB/km and the mean value of 0.19dB/km.
Further, for the polarisation mode dispersion value, the optical fiber that meets G652 shows 0.020 (ps/km
1/2) mean value, 0.015 (ps/km
1/2) standard deviation and 0.042 (ps/km
1/2) link PMD, simultaneously, the optical fiber that its mode field diameter is equal to or less than 10 μ m shows 0.026 (ps/km
1/2) mean value, 0.018 (ps/km
1/2) standard deviation and 0.044 (ps/km
1/2) link PMD.
Further, in basic and above-mentioned optical cable 201 similar intermediate column branches test (yet, it is 750mm that sheath 6d removes length), for the optical fiber that meets G652, unidentified 1.0dB or bigger loss increase, simultaneously, be equal to or less than the optical fiber of 10 μ m for its mode field diameter, unidentified 0.5dB or bigger loss increase.
In this way, the loss that increases during column branch between in commission is that 1.0dB or littler optical cable can advantageously be carried out intermediate column branch under electriferous state, might only correctly take out the optical fiber of wishing by branch, and use other optical fiber in the downstream.Correspondingly, might effectively utilize the whole optical fiber that are contained in the optical cable.Correspondingly, the constructions cost of communication line can be controlled in reduced levels.
Further, even when using unbranched optical fiber to carry out high-speed communication, even perhaps when executive communication in the less zone of dynamic range, also the loss that can increase when carrying out intermediate column branch is to take out the optical fiber of wishing 0.5dB or the littler optical cable.Correspondingly, the degree of freedom in the time of can significantly increasing the design optical communication system.
Below, explain optical cable in conjunction with the accompanying drawings in detail according to second embodiment of the invention.
Figure 26 A is the viewgraph of cross-section according to the optical cable of second embodiment of the invention, and Figure 26 B then is its side view.Shown in Figure 26 A, this loose thimble tube optical cable 301 by the about 250 μ m of the external diameter that is arranged in parallel four optical fiber and by covering optical fiber with band shape with ultraviolet curable resin, and form 4-fiber optic band 310.This 4-fiber optic band 310 has the width of 1.1mm and the thickness of 0.27mm.Stacked 4 such fibre ribbons 310 are to form duplexer 309.Duplexer 309 is contained in the pipe 308 that plastics make, simultaneously with the 1000mm lay along a direction distortion duplexer 309, wherein, pipe 308 is made by polybutylene-terephthalate (PBT), and external diameter 2.6mm, internal diameter 1.8mm.In the pipe 308 that plastics are made, fill oily jelly 307.
Shown in Figure 26 B, 6 the pipe 308 be wrapped in tensile strength body 306 around on, wherein, tensile strength body 306 has the external diameter of 2.6mm and is for example made by G-FRP, thereby, by periodically repetitive reverse part, center section and hop twist (SZ distortion) pipe 308 with the 500mm spacing.Then, nylon rope 305 is wrapped on the pipe 308 and pushes down them simultaneously, subsequently, twines the not pressure coil 304 (referring to Figure 26 A) of braiding.Then, made by tygon in the 304 outside formation of pressure coil and thickness is the sheath 303 of 1.5mm.Correspondingly, this optical cable 301 has 96 fibers, and external diameter 10mm.Further, in pressure coil 304 inside, fill water absorbing agent 302.
In optical cable 301, pipe 308 direction of twist is periodically put upside down, thereby, by the arbitrary portion of cutting sheath 303 and pressure coil 304, the reverse part taking-up fibre ribbon 310 of the pipe of might be easily making from plastics 308.Correspondingly, adopting the loose thimble tube optical cable 301 of SZ distortion is the structure that is suitable for intermediate column branch.Although the loose thimble tube optical cable 301 that adopts the SZ distortion is made an explanation, the distortion mode is not limited to the SZ distortion.For example, the present invention also can be applicable to adopt the loose thimble tube optical cable of unidirectional distortion.
In the fibre ribbon 310 in being contained in pipe 308, with with the identical mode of the above-mentioned first embodiment optical cable, for example shown in Figure 1A, be arranged in parallel many (in this embodiment, for example be 4) optical fiber 11, then, outside these optical fiber that are arranged in parallel 11 whole, place and the whole length at optical fiber 11 on cover the sheath 12 that forms by resin.For detailed structure and the feature relevant, omit the detailed description of described structure and feature with fibre ribbon 310.
Fibre ribbon 310 forms to such an extent that make the thickness of sheath 12 littler than the jacket thickness of correlation technique fibre ribbon.Here, when the maximum thickness of fibre ribbon 310 is the external diameter of T (μ m) and optical fiber 11 when being d (μ m), obtain the thickness t of sheath 12 by equation t=(T-d)/2.In fibre ribbon 310, the thickness t of sheath 12 is set to such an extent that set up the relation of T≤d+40 (μ m), that is, the thickness t of sheath 12 becomes and is equal to or less than 20 μ m.
Utilization has the fibre ribbon 310 of thin sheath 12, can further strengthen the high data density of correlation technique pine thimble tube optical cable, and simultaneously, might obtain to be very easy to the optical cable 301 that partly takes out fibre ribbon from the centre and guarantee engineering properties simultaneously.
In this way, in fibre ribbon 310, because the thickness t of sheath 12 is less, therefore, the manual operations by the operator or branch's instrument and produce the crack or delaminate on sheath are peeled off sheath 12 easily.Correspondingly, by peeling off sheath 12 from fibre ribbon 310, optical fiber 11 easy branches.That is to say that fibre ribbon 310 adopts the structure of carrying out the intermediate column branch operation easily.
Further, carry out the method that is used to carry out intermediate column branch according to the above step of having explained in conjunction with Fig. 2 A-2C.
Here, in the operability of the intermediate column branch that causes owing to the difference of the thickness t of sheath 12 shown in the table 18 relation between charged loss increases in the operating process therewith.Further, in table 18, be illustrated in optical fiber and be contained in state polarisation mode dispersion (loose tube cable PMD) down in the optical cable 301 and the separating experiment result who represents optical fiber integrality intensity.Here, the optical fiber outside diameter d in the fibre ribbon shown in the table 18 is 250 μ m.Further, the Young modulus of the resin of formation sheath 12 is 900MPa.
[table 18]
| Tape thickness T (μ m) | 250 | 251 | 260 | 270 | 275 | 280 | 290 | 300 | 310 | 320 |
| Jacket thickness t (μ m) | 0.0 | 0.5 | 5 | 10 | 12.5 | 15 | 20 | 25 | 30 | 35 |
| Intermediate column branch character | Very good | Very good | Good | Good | Good | Good | All right | Bad | Bad | Bad |
| Charged loss increases | Good | Good | Good | Good | Good | All right | All right | Bad | Bad | Bad |
| Loose tube cable PMD | Good | Good | Good | Good | Good | All right | All right | All right | All right | All right |
| Having or do not have optical fiber separates | Bad | Good | Good | Good | Good | Good | Good | Good | Good | Good |
Here, jacket thickness t is that 0.0 fibre ribbon represents that as shown in figure 10 resin does not cover the fibre ribbon of whole optical fiber in the table 18.
The branch of intermediate column shown in the table 18 character represents when the center section of fibre ribbon branches into each optical fiber, remains 1.0dB or the easy degree of branch more hour in the loss that increases.For the assessment level that in this instructions, uses, " very good " means and can carry out branch in 2 minutes, " good " means and can surpass 2 minutes and carry out branch in running time in 3 minutes, and " all right " be then represented and can carry out branch above within 3 minutes and running time in 5 minutes.Further, " bad " expression branch need surpass 5 minutes average operating time.
Here, the fact that is equal to or less than 1.0dB of the loss increase during branch means and can carry out charged branch.
Here, in above step, carry out intermediate column branch property experiment in conjunction with Figure 21 A and 21B explanation.
In the fibre ribbon shown in the table 18, the fibre ribbon that intermediate column branch character shows assessment " very good ", " good " and " all right " has 290 μ m or littler tape thickness, promptly satisfies T≤d+40 (μ m).All these fibre ribbons can be finished intermediate column branch in 5 minutes, the loss when limiting branch simultaneously increases to 1.0dB or littler.That is to say, might in 5 minutes, carry out charged branch.
On the contrary, for the correlation technique fibre ribbon with big jacket thickness, wherein, jacket thickness exceeds 40 μ m than the outside diameter d of optical fiber, and intermediate column branch character shows as " bad ".That is to say that the loss during branch increases above 1.0dB, perhaps, even but branch optical fiber, but branch operation requires to surpass 5 minutes preset time, thereby, consider from real viewpoint, can not carry out charged branch.
Charged loss increase shown in the table 18 is illustrated in the recruitment (increment) of the loss that produces in the intermediate column branch operation process.For the assessment level in this instructions, " very good " means that the loss increase is no more than 0.1dB in the branch operation process, " good " means that the loss increase is no more than 0.5dB in the branch operation process, and " all right " means that then the loss increase is no more than 1.0dB in the branch operation process.Further, " bad " means that the added value of loss in the branch operation process surpasses 1.0dB.
In fibre ribbon shown in the table 18, the fibre ribbon that charged loss increase shows assessment " good " and " all right " has 290 μ m or littler tape thickness, promptly satisfies T≤d+40 (μ m).All these charged fibre ribbons can be finished intermediate column branch, and the loss when limiting branch simultaneously increases to 1.0dB or littler.Particularly, be 275 μ m or littler fibre ribbon for tape thickness T, that is, for the fibre ribbon that satisfies T≤d+25 (μ m), charged loss increase shows as " good ", thereby the loss increase can further be suppressed to lower level.Correspondingly, these optical fiber are preferred.
On the contrary, exceed 40 μ m than optical fiber outside diameter d and have the correlation technique fibre ribbon of jacket thickness greatly for its tape thickness T, charged loss increase shows as " bad ", and in the branch operation process, the added value of loss surpasses 1.0dB.
The PMD of loose tube cable shown in the table 18 represents to be in fibre ribbon 310 shown in Figure 26 A and is contained in link polarisation mode dispersion under the state in the loose tube cable.Here, the link polarisation mode dispersion is represented the maximal value of the PMD that produces when the value of the polarisation mode dispersion (PMD) that is contained in all optical fiber 11 in the optical cable 301 being carried out a large amount of equivalent optical cable of statistical treatment parallel-series.Here, carry out statistical treatment based on Central Limit Theorem.Further, the length at optical cable 301 is to carry out the measurement of PMD under 1000m or longer and the condition of use based on the measuring equipment (6000B that is made by SuntecInc) of interference technique.
For the assessment level in this instructions, " very good " means that link polarisation mode dispersion (link PMD) is equal to or less than 0.05 (ps/km
1/2), " good " means that the link polarisation mode dispersion surpasses 0.05 (ps/km
1/2) and be equal to or less than 0.1 (ps/km
1/2), " all right " means that the link polarisation mode dispersion surpasses 0.1 (ps/km
1/2) and be equal to or less than 0.2 (ps/km
1/2), and " bad " means that the link polarisation mode dispersion surpasses 0.2 (ps/km
1/2).
In loose thimble tube optical cable, fibre ribbon is arranged in the pipe with overlapped way, thereby, produce the stress of fixed-direction, and in optical fiber, produce birefringence.Further, also because the cure shrinkage of the sheath of fibre ribbon also is easy to generate birefringence.The sheath of fibre ribbon (resin) shrinks about 5% because of the curing when it is made.Because this cure shrinkage, external force acts on the optical fiber, and produces stress in the inside of optical fiber.Yet fibre ribbon has on Width the shape of cross section of being widened, thereby, stress Width be different on thickness direction.Particularly, with respect to optical fiber, the sheath that is arranged on the ribbon thickness direction forms on the Width of fibre ribbon continuously, thereby when the thickness of the sheath on these parts was big, the stress that produces on Width increased, thereby the stress difference on Width and the thickness direction increases.
In this way, in the loose thimble tube optical cable of receiving optical fiber band, PMD increases easily.Particularly, when with SZ form twisted tube, because reverse shape, fibre ribbon is with the mode bending of complexity.Thereby, observe the trend that PMD increases easily.
In this embodiment, use the jacket thickness fibre ribbon thinner than correlation technique fibre ribbon, the birefringence that produces because of cure shrinkage can be suppressed to extremely little value.Correspondingly, the optical cable of this embodiment can suppress to be lower level to PMD.
In optical cable shown in the table 18, when optical cable satisfied T≤d+25 (μ m), loose tube cable PMD became " good ", thereby, should be understood that this optical cable is particularly advantageous.
Optical fiber shown in the table 18 separates and whether has the result who represents discrete testing, and this result represents the intensity of optical fiber integrality.
Carry out this discrete testing according to above step in conjunction with Figure 22 explanation.
For in this instructions, separating relevant assessment level with optical fiber, " good " means between optical fiber and sheath (resin) and do not separate, and fibre ribbon remains integral form in a longitudinal direction, and " bad " then means and cause part disconnected from each other between optical fiber and the sheath (resin).
In fibre ribbon shown in the table 18, when fibre ribbon satisfies when concerning T 〉=d+1 (μ m), the separation that does not produce fibre ribbon, thereby optical cable is favourable.That is to say discovery: when the thickness t of sheath was equal to or greater than 0.5 μ m, optical cable had enough intensity, so that each optical fiber becomes integral body.
In fibre ribbon shown in the table 18, satisfy and to concern that the fibre ribbon (referring to Figure 10) of T=d produces separating part in separating experiment.Yet, considering the external force that when making optical cable, in production line, reduces to affact on the fibre ribbon as squeezing the fact of drawing, might avoid the defective that band separates taking place in that optical fiber is formed in the manufacturing step of optical cable.Further, for satisfying the fibre ribbon that concerns T=d, owing in by the part on the ribbon thickness direction of each fiber optic hub, remove sheath substantially, therefore, on the Width of fibre ribbon, peel off each optical fiber easily, thereby, compare with having the fibre ribbon that covers the shape of whole optical fiber with sheath, can more successfully carry out intermediate column branch.
For fibre ribbon 10A shown in Figure 10, wherein, resin 12aA does not cover whole optical fiber 11A, only uses the adhesion strength between resin 12aA and the optical fiber and makes each optical fiber 11A become integral body.On the contrary, for fibre ribbon shown in Figure 1A 10, intactly cover whole optical fiber 11 with the resin that constitutes sheath 12, thereby, the adhesion strength between resin and optical fiber, fibre ribbon 10 is easily because of being tending towards keeping the power of sheath 12 shapes to keep whole fibre ribbons 10 to become whole state.
Further, in above-mentioned fibre ribbon (referring to Figure 1A),, can reduce PMD by the ratio between the sum of products of the Young modulus E of the product of the Young modulus E of sheath (resin) and cross-sectional area S and each optical fiber 11 and cross-sectional area S is set at appropriate value.Along with the Young modulus increase of the resin that constitutes sheath 12 and the thickness of sheath 12 increase, the stress intensity that acts on the optical fiber 11 when sheath 12 produces cure shrinkage increases.Here, the reason that causes PMD to increase is the strain that produces in the glass fibre 13 of optical fiber 11.Based on determining the strain size by the stress intensity of overlay arrival glass fibre 13 and the Young modulus of glass fibre 13, wherein, described overlay comprises main protection coating 14, auxiliary protection coating 15 and color layer.
Then, when the thickness of fibre ribbon 310 not simultaneously, that is, and when the thickness of sheath 12 not simultaneously, Young modulus at sheath 12 is respectively under each condition of 700MPa, 900MPa, 1200MPa and 1500MPa, the ES product ratio of examination sheath 12 and optical fiber 11 and the relation between the loose tube cable PMD.
Here, glass fibre 13 has the Young modulus of 73000MPa and the external diameter of 125 μ m.Main protection coating 14 has the Young modulus of 1MPa and the external diameter of 200 μ m.Auxiliary protection coating 15 has the Young modulus of 700MPa and the external diameter of 240 μ m.Color layer has the Young modulus of 1500MPa and the external diameter of 250 μ m.
Shown in the table 19 when the Young modulus of sheath 12 is 700MPa the ES product than and loose tube cable PMD between relation.
[table 19]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 10.264 | 10.789 | 12.014 | 12.889 | 13.764 | 14.639 | 16.389 |
| ES product ratio | 0.0113 | 0.0118 | 0.0132 | 0.0141 | 0.0151 | 0.160 | 0.0180 |
| Loose tube cable PMD | Good | Good | Good | Good | Good | All right | All right |
Shown in the table 20 when the Young modulus of sheath 12 is 900MPa the ES product than and loose tube cable PMD between relation.
[table 20]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 13.196 | 13.871 | 15.446 | 16.571 | 17.696 | 18.821 | 21.071 |
| ES product ratio | 0.0145 | 0.0152 | 0.0169 | 0.0182 | 0.0194 | 0.0206 | 0.0231 |
| Loose tube cable PMD | Good | Good | Good | Good | Good | All right | All right |
Shown in the table 21 when the Young modulus of sheath 12 is 1200MPa the ES product than and loose tube cable PMD between relation.
[table 21]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 17.595 | 18.495 | 20.595 | 22.095 | 23.595 | 25.095 | 28.095 |
| ES product ratio | 0.0193 | 0.0203 | 0.0226 | 0.0242 | 0.0259 | 0.0275 | 0.0308 |
| Loose tube cable PMD | Good | All right | All right | All right | All right | Bad | Bad |
Shown in the table 22 when the Young modulus of sheath 12 is 1500MPa the ES product than and loose tube cable PMD between relation.
[table 22]
| Tape thickness T (μ m) | 255 | 258 | 265 | 270 | 274 | 280 | 290 |
| The optical fiber ES sum of products (N) | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 | 912.2 |
| Resin ES product (N) | 21.994 | 23.119 | 25.744 | 27.619 | 29.494 | 31.369 | 35.119 |
| ES product ratio | 0.0241 | 0.0253 | 0.0282 | 0.0303 | 0.0323 | 0.0344 | 0.0385 |
| Loose tube cable PMD | All right | All right | Bad | Bad | Bad | Bad | Bad |
Here, the optical fiber ES product shown in the table 19-table 22 be the zone that constitutes by glass fibre 13, main protection coating 14, auxiliary protection coating 15 and color layer each ES product and, and resin ES product is the ES product of sheath 12.ES product ratio can be expressed as " resin ES product/optical fiber ES product ".
As show as shown in the 19-table 22, loose tube cable PMD obtains the condition of " good " or " all right ", that is and, the link PMD that is contained in whole fibers of the optical fiber in the loose thimble tube optical cable is 0.2 (ps/km
1/2) or littler condition be the ES product than for being equal to or less than the situation of 0.026 value.Further, loose tube cable PMD obtains the condition of " good ", that is, the link PMD that is contained in whole fibers of the optical fiber in the loose thimble tube optical cable is 0.1 (ps/km
1/2) or littler condition be the ES product than for being equal to or less than the situation of 0.020 value.
In this way, be set at designated value, might suppress to be lower level to the PMD of optical fiber 11 by ES product ratio sheath 12 and optical fiber 11.
Further, for another preference pattern that is contained in according to the fibre ribbon in the optical cable of second embodiment of the invention, can enumerate the fibre ribbon shown in Figure 11 A.That is to say that shown in Figure 11 A, for fibre ribbon 310, in the sheath 112 that covers optical fiber 111, and the recess that forms as one man forms recessed portion 116 between the adjacent fiber 111,111.Recessed portion 116 comprises base section 117, and wherein, base section 117 is the parts with maximum recess.Further, can enumerate the fibre ribbon 110A shown in Figure 13 A, fibre ribbon 110A constitutes another pattern that the structure by fibre ribbon 110 shown in local modification Figure 11 A obtains.Omission is to the detailed explanation of the detailed structure and the feature of fibre ribbon 310.
Here, in pipe shown in Figure 26 A during the receiving optical fiber band, because stacked fibre ribbon is therefore, at the optical fiber of fiber bandwidth degree direction end with between the optical fiber of last fibre ribbon inside, different to the distance of twisting center in the inner distortion of pipe.Correspondingly, between end optical fiber and internal optical fiber, produce length difference, thereby, stress in optical fiber, produced.This stress applies anisotropic stress to glass fibre, thereby, produce birefringence, and this becomes the reason that PMD increases.
On the contrary, in fibre ribbon 110A shown in Figure 13 A, in sheath, form recessed portion, thereby as shown in figure 14, fibre ribbon 110A is easy deflection on Width.Correspondingly, when fibre ribbon 110A is contained in the pipe, fibre ribbon 110A is not applied excessive power, thereby, solve the length difference that between end optical fiber and internal optical fiber, produces in the inside of pipe, think thus and can improve optical cable PMD.Further, the sheath 112A of fibre ribbon 110A is approximately circular along the periphery of optical fiber 111A, thereby the anisotropy of the curing shrinkage internal stress among the sheath 112A that can reduce to take place when making fibre ribbon 110A is thought the PMD of the fibre ribbon 110A that can further reduce to be in the optical cable state thus.At this, this advantageous effects also obtains by fibre ribbon shown in Figure 11 A 110, and the fibre ribbon 110A with darker recessed portion can show advantageous effects more significantly.
Here, for the degree of depth of the recessed portion that in sheath shown in Figure 11 and Figure 13 A, forms, examination: by being arranged in parallel multifiber and by they being become prevent when integral body is made fibre ribbon optical fiber from separating; When carrying out the fitting operation of fibre ribbon, prevent to peel off (becoming the reason that optical fiber separates); The perhaps increase of loss or reduce in favourable branch operation or charged branching process.As a result, find that recessed portion is preferably formed to such an extent that make recessed portion be no more than the common tangent that is formed by adjacent fiber.That is to say, find than common tangent more a side of the inside to form recessed portion be favourable.
Following specific explanations examination result.
Be set at the situation of 270 μ m, 280 μ m and 290 μ m for the thickness T (μ m) of fibre ribbon, calculate asynchronous ratio t/Y of degree of depth Y (μ m) and ratio g/d when recessed portion, and, examine the intermediate column branch character under the various situations, charged loss increase and loose tube cable PMD, wherein, ratio t/Y is the thickness t (μ m) of sheath and the ratio of the degree of depth Y (μ m) of recessed portion, and ratio g/d is that fibre ribbon is at the ratio of the thickness g of recess office (μ m) with the outside diameter d (μ m) of optical fiber.
Shown in the table 23 when the thickness T of fibre ribbon is 270 μ m the relation between intermediate column branch character, charged loss increase and the loose tube cable PMD.Here, the ratio in the form (T-d)/2Y is the equivalence value of t/Y.
[table 23]
| Tape thickness T (μ m) | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 |
| Jacket thickness t (μ m) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/ | 10 | 5 | 2 | 1 | 0.5 | 0.333 | 0.25 | 0.2 | 0.1 |
| Ratio g/d | 1.072 | 1.064 | 1.04 | 1 | 0.92 | 0.84 | 0.76 | 0.68 | 0.28 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | Good | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good |
| Loose tube cable PMD | Good | Good | Good | Good | Good | Good | Very good | Very good | Very good |
Shown in the table 24 when the thickness T of fibre ribbon is 280 μ m the relation between intermediate column branch character, charged loss increase and the loose tube cable PMD.
[table 24]
| Tape thickness T (μ m) | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 |
| Jacket thickness t (μ m) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/ | 15 | 7.5 | 3 | 1.5 | 0.75 | 0.5 | 0.375 | 0.3 | 0.15 |
| Ratio g/d | 1.112 | 1.104 | 1.08 | 1.04 | 0.96 | 0.88 | 0.8 | 0.72 | 0.32 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | Good | Very good | Very good | Very good | Very good | Very good |
| Loose tube cable PMD | All right | All right | All right | All right | Good | Good | Very good | Very good | Very good |
Shown in the table 25 when the thickness T of fibre ribbon is 290 μ m the relation between intermediate column branch character, charged loss increase and the loose tube cable PMD.
[table 25]
| Tape thickness T (μ m) | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 |
| Jacket thickness t (μ m) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/2Y | 20 | 10 | 4 | 2 | 1 | 0.667 | 0.5 | 0.4 | 0.2 |
| Ratio g/d | 1.152 | 1.144 | 1.12 | 1.08 | 1 | 0.92 | 0.84 | 0.76 | 0.36 |
| Intermediate column branch character | All right | All right | Good | Good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | All right | All right | All right | All right | All right | All right |
| Loose tube cable PMD | All right | All right | All right | All right | Good | Good | Good | Very good | Very good |
As show shown in the 23-table 25, intermediate column branch character, charged loss increase and any of SD optical cable PMD in, the degree of depth Y of recessed portion is big more, just obtains favourable more result.
Further, when the thickness T of fibre ribbon is 270 μ m or 280 μ m, that is, when the thickness T of fibre ribbon satisfies T≤d+30 (μ m), increase, might obtain particularly advantageous result for intermediate column branch character, charged loss.Reason is: when the branch instrument that uses shown in Figure 12 A-Figure 12 C, because the advantageous effects of recessed portion is improved branch's character than the fibre ribbon that only reduces jacket thickness.For example, though when shown in table 23, when tape thickness T is set at 270 μ m, being evaluated as of intermediate column branch character " good ", still, when shown in table 24, when the degree of depth Y that tape thickness is set at 280 μ m and recessed portion is set at 5 μ m, being evaluated as of intermediate column branch character " very good ", thereby, can confirm the advantageous effects of recessed portion.
Further, pay close attention to intermediate column branch character, especially the value with ratio (T-d)/2Y is relevant to should be understood that intermediate column branch character.For example, when ratio (T-d)/when 2Y is equal to or less than 4.0, might obtain favourable intermediate column branch character.
Further, pay close attention to loose tube cable PMD, especially the value with ratio g/d is relevant to should be understood that loose tube cable PMD.For example, when ratio g/d is equal to or less than 1, that is, when within the common tangent of base section at optical fiber, might obtains significant PMD and suppress effect, reduce amount of resin simultaneously fully.
When ratio g/d was equal to or less than 1.0, sheath was thinner, be arranged in outside the common tangent to prevent base section, thereby, sheath is crooked in a longitudinal direction easily, and simultaneously, recessed portion is darker, thereby, be easy to generate deflection shown in Figure 14, think thus and can suppress optical cable PMD effectively.
Further, when ratio g/d is equal to or less than 0.8, can further effectively be suppressed at optical fiber and be contained in PMD under the state in the loose tube cable.
In the general coating of optical fiber, around glass fibre, cover main protection coating with low Young modulus, and, with the periphery of auxiliary protection coating with high Young's modulus and color layer covering main protection coating.Further, being of uniform thickness of the external diameter of main protection coating and optical fiber outside diameter d is big, is about 0.8 times.Then, when the resin in the recessed portion had been no more than in the scope of main protection coating, the thickness of sheath was easily deformable, thereby, be easy to generate deflection shown in Figure 14.Correspondingly, can further suppress PMD.
In fibre ribbon, wish to form the recessed portion of sheath with level and smooth curved shape R with recessed portion shown in Figure 11 A and Figure 13 A.This be because: for example, when the base section of recessed portion when the shape of fibre ribbon forms with sharp shape, stress concentrates on the base section of recessed portion, thereby, be easy to generate fracture and crackle.
Further, at the fibre ribbon that is used for optical cable of the present invention shown in Figure 1A, Figure 10, Figure 11 A and Figure 13 A, the loss that the adhesion strength between optical fiber and the sheath influences when carrying out charged branch sometimes increases and hot line job efficient.For the adhesion strength of optical fiber and sheath (resin), consider to prevent that loss from increasing and branch's operability that the adhesion strength of every optical fiber is favourable in the scope of 0.245 (mN)-2.45 (mN).When above-mentioned adhesion strength than above-mentioned scope more hour, can cause following situation: sheath fracture when forming optical cable, and optical fiber is disconnected from each other.On the other hand, when adhesion strength was bigger than above-mentioned scope, branch's character descended.
Here, use is above in conjunction with Fig. 5 and the method measuring optical fiber of Fig. 6 explanation and the adhesion strength between the sheath.
In the used fibre ribbon of the present invention, when fundamental purpose of the present invention is a being kept perfectly property of optical fiber and when not separating mutually, it is favourable that the thickness of sheath is equal to or greater than 0.5 μ m.In the case, the maximum ga(u)ge T of fibre ribbon becomes T 〉=optical fiber outside diameter d+1 (μ m).
In addition, in some cases, according to the character of the sheath of fibre ribbon, the loss of these property effects when charged branch increases and hot line job efficient.Preferably as the yield point stress of sheath material character in the scope of 20MPa-45MPa.This is because carry out easily branch operation, and can be suppressed at the loss when carrying out charged branch.According to JIS K7113, under 50mm/ minute draw speed, measure the yield point stress of No. 2 sample.When yield point stress during less than 20MPa, following situation appears: the assembling optical fiber band with the step that forms optical cable in, each optical fiber separates because of the external force that affacts on the optical fiber, thereby, can not form optical cable.On the other hand, when yield point stress surpasses 45MPa, be difficult to make sheath to break, thereby, the intermediate column branch that is difficult to carry out fibre ribbon.
Further, in this embodiment, for optical cable 301 shown in Figure 26 A, loss value when measuring wavelength 1.55 μ m and polarisation mode dispersion (PMD) value.Further, the loss of measuring when carrying out intermediate column branch increases (increment).
Here, fibre ribbon is the fibre ribbon 110A shown in Figure 13 A as used herein, and the thickness T of fibre ribbon is 270 μ m.The outside diameter d of fibre ribbon 110A is 250 μ m.Further, the thickness t of sheath is 10 μ m, and the degree of depth Y of recessed portion is 40 μ m.The thickness g of fibre ribbon in the recess office is 190 μ m.Yet, in being integrated into the optical fiber of fibre ribbon, from the optical fiber that meets G652, select 48 fibers, and 48 remaining fibers have the mode field diameter that is equal to or less than 10 μ m.
For the loss value that is in the optical fiber under the state that is contained in the optical cable 301, the optical fiber that meets G652 shows the maximal value of 0.23dB/km and the mean value of 0.21dB/km, simultaneously, its mode field diameter is that 10 μ m or littler optical fiber show the maximal value of 0.21dB/km and the mean value of 0.20dB/km.
Further, for the polarisation mode dispersion value, the optical fiber that meets G652 has 0.024 (ps/km
1/2) mean value, 0.020 (ps/km
1/2) standard deviation and 0.045 (ps/km
1/2) link PMD, simultaneously, its mode field diameter is that 10 μ m or littler optical fiber have 0.023 (ps/km
1/2) mean value, 0.019 (ps/km
1/2) standard deviation and 0.043 (ps/km
1/2) link PMD.
In this way, form optical cable loss and PMD afterwards for optical fiber, its mode field diameter is that 10 μ m or littler optical fiber show more favourable characteristic.
Further, as mentioned above, in pipe, merge fibre ribbon and pipe is twisted into the optical cable of SZ or comprises that the optical cable that is positioned at its center and non-warping single pipe shows favourable intermediate column branch character.Correspondingly, when this optical cable as the subscriber who is connected between radio station and the ordinary subscribers-system communication path the time, in many cases, the length of optical cable is shorter than the optical cable of the relay system that is used to connect the radio station, and the longest be tens km.Yet, when from the radio station when a subscriber distributes an optical fiber, under the bigger situation of subscriber's quantity, it is essential that the optical cable that can hold a large amount of optical fiber becomes, thereby optic cable diameter becomes large-sized.This situation is disadvantageous when optical cable is installed in pipeline.Correspondingly, wavelength division multiplexed (WDM) technology of signal of the many subscribers of stack is effectively in an optical fiber, and, but need a kind of optical cable of high-speed transfer signal strongly.
With the same in the situation according to optical cable of the present invention, PMD is equal to or less than 0.2 (ps/km when link
1/2) time, be under the situation of 400Gbps in transfer rate, but transmission range become 156km, thereby, might guarantee enough amount of communications to the subscriber system.
Further, be equal to or less than 0.1 (ps/km when linking PMD
1/2) time, be under the situation of 40Gbps in transfer rate, but transmission range become 625km, and, be under the situation of 80Gbps in transfer rate, but transmission range becomes 156km, thereby be preferred.
Here, explain by carrying out the method that loss is measured by intermediate column branch in conjunction with Figure 23 from optical cable.
At first, as shown in figure 23, in any fibre ribbon in pipe, the light source 220 that the light of permission wavelength 1.55 μ m incides among the first optical fiber 11a is connected to optical fiber 11a in a side of optical cable 301, simultaneously, optical receiver 221 is connected optical fiber 11a with storage oscilloscope 222 on the opposite side of optical cable 301.Under this state, the light of wavelength 1.55 μ m incides on the first optical fiber 11a from light source 220.Incident light is sent to the opposite side of optical fiber 11a, and is received by receiver 221.Receive the reception light quantity of light with suitable number of times observation post by storage oscilloscope 222.
Then, the light at light source 220 continues under the state of incident the length of removing sheath and the about 500mm of pressure coil at the center section of optical cable 301.Utilize the reverse part of distortion and take out the pipe that comprises optical fiber 11a, wherein, the light of light source incides on the optical fiber 11a.Further, the use pipe cutter is removed the pipe coating on the center section, and takes out fibre ribbon 10c.Then, fibre ribbon 10c branches into a plurality of simple optical fibers, and cuts the 4th optical fiber 11b.Here, carry out the method that is used for fibre ribbon 10c branch according to above step in conjunction with Fig. 2 A-2C explanation.
By range of observation is to remove sheath until the step of finishing the operation of using storage oscilloscope 222 from optical cable 301, and carries out the measurement of loss.
As a result, for the recruitment of loss in the operating process, the value of the unidentified 1.0dB of being equal to or greater than in meeting the optical fiber of G652 simultaneously, is equal to or less than in the optical fiber of 10 μ m the unidentified value that is equal to or greater than 0.5dB in its mode field diameter.
Below, explain the center cast optical cable that constitutes according to another modification of second embodiment of the invention.Here, with parts are identical in the aforementioned loose thimble tube optical cable 301 parts with identical symbolic representation, and omit the repetition of explanation of these parts.Figure 27 A is its type for merging fibre ribbon at a pipe that is positioned at the optical cable center and filling the viewgraph of cross-section of the optical cable of jelly at pipe, and Figure 27 B is the viewgraph of cross-section of 24-fiber optic band, and Figure 28 then is the viewgraph of cross-section of the optical cable of filling yarn types.
Be configured in filling jelly type optical cable 301A shown in Figure 27 A: these optical fiber are arranged in parallel under the state that 24 optical fiber that meet G652 and external diameter 250 μ m contact with each other, optical fiber covers with ultraviolet curable resin, so that form the 24-fiber optic band shown in Figure 27 B, and, stacked 18 such fibre ribbon 310d are to form duplexer 309A.Here, 24-fiber optic band has the thickness T of width and the 270 μ m of 6.1mm, and the thickness t of its sheath is 10 μ m simultaneously.Further, the degree of depth Y of recessed portion is 40 μ m, and the thickness g of fibre ribbon 310d in the recess office is 190 μ m.By twisting duplexer 309A along a direction with the 1000mm lay, in the plastic tube 308A that makes by polybutylene-terephthalate (PBT), hold duplexer 309A, wherein, plastic tube 308A has the external diameter of 14mm and the internal diameter of 10mm.Then, in plastic tube 308A, fill jelly 307A.
Connect tensile strength body 306A (as, the G-FRP of external diameter 1.5mm) in the outside of plastic tube 308A, thereby three tensile strength body 306A extend in a longitudinal direction on left and right each side.Forming the thickness of being made by tygon on the outside of said structure is the sheath 303A of 2.5mm.Here, along tensile strength body 306A be arranged in parallel be used to tear sheath 303A tear rope 305A.Because this structure, optical cable has favorable properties, thereby the loss after forming optical cable when wavelength 1.55 μ m is 0.25dB/km, and link PMD is 0.05ps/km
1/2Further, in the mode identical with above-mentioned optical cable 301, the loss that increases in the experiment of intermediate column branch can be suppressed to 1.0dB or littler.
Further, as shown in figure 28, fill yarn types optical cable 301B and form duplexer 309B by stacked 6 4-fiber optic bands that have recessed portion as shown in FIG. 13A.4-fiber optic band has the thickness T of 270 μ m and the jacket thickness t of 10 μ m.Further, the degree of depth Y of recessed portion is 30 μ m, and the thickness g of fibre ribbon in the recess office is 210 μ m.Duplexer 309B twist along a direction with the yarn 322 that constitutes filling material, and they all cover with tygon with tensile strength body 306, peanut-shaped Support Level 323 etc.Although the filling yarn types optical cable that adopts unidirectional distortion is made an explanation, modification is not limited to unidirectional distortion, and can be applicable to adopt the optical cable of SZ direction distortion.Here, in the inside of sheath 303B, be provided for tearing the 305B that restricts that tears of sheath 303B.Because this structure, optical cable has favorable properties, thereby the loss after forming optical cable when wavelength 1.55 μ m is 0.25dB/km, and link PMD is 0.1ps/km
1/2Or it is littler.Further, in the mode identical with above-mentioned optical cable 301, for the optical fiber that meets G652, the loss that increases in the experiment of intermediate column branch can be suppressed to 1.0dB or littler, and be 10 μ m or littler optical fiber for its mode field diameter, the loss of increase can be suppressed to 0.5dB or littler.
In this way, in commission between during column branch loss increase to 1.0dB or littler optical cable can advantageously be carried out intermediate column branch under electriferous state, might only correctly take out the optical fiber of wishing by branch, and use other optical fiber in the downstream.Correspondingly, might effectively utilize the whole optical fiber that are contained in the optical cable.Correspondingly, the constructions cost of communication line can be controlled in reduced levels.
Further, even when using unbranched optical fiber to carry out high-speed communication, even perhaps when executive communication in the less zone of dynamic range, also can be when carrying out intermediate column branch loss increase to the optical fiber that takes out hope 0.5dB or the littler optical cable.Correspondingly, the degree of freedom in the time of can significantly increasing the design optical communication system.
In conjunction with the optical cable of Figure 29-Figure 38 explanation according to third embodiment of the invention.
In componentry 409, fibre ribbon 410 is arranged in the center of componentry 409, forms them by using sheath 403 covering fibre ribbons 410 and two tensile strength bodies 402 of being made by thermoplastic resin.Fibre ribbon 410 and two tensile strength body 402 usefulness sheaths 403 cover, thereby they are adhered to one another.For thermoplastic resin, suitably use tygon or the PVC that does not fire.
With the common plane of fibre ribbon 410 in two the tensile strength bodies 402 that are arranged in parallel, thereby, between two tensile strength bodies 402, arrange fibre ribbon 410.
Further, preferably the adhesion layer (not shown in FIG.) is set outer the placing of the tensile strength body of making by glass FRP 402.In the case, tensile strength body 402 and sheath 403 are strong mutually adheres to.For the material of adhesion layer, suitably use tygon.
In this way, by covering fibre ribbon 410 and tensile strength body 402 together, tensile strength body 402 bears external force such as the pulling force that affacts on the componentry 409, so that protection fibre ribbon 410 is not influenced by external force.
Further, in the periphery of componentry 409, form two notches 404, make these notches 404 towards fibre ribbon 410.It is for the ease of removing fibre ribbon 410 that notch 404 is set.When taking out fibre ribbon 410, in sheath 403, forming otch between two notches 404, and tearing 403.
Further, in neck part 406, componentry 409 and cable messenger part 408 are by resin whole form identical with the sheath 403 of componentry 409 and cable messenger part 408.In this neck part 406, when resolution element part 409 and cable messenger part 408, tear componentry 409 and cable messenger part 408 with hand or finger easily.
For being contained in, can enumerate the fibre ribbon similar 10 to the fibre ribbon of above-mentioned first and second embodiment according to the fibre ribbon in the optical cable of the present invention 410.That is to say, shown in Figure 1A, for example, in fibre ribbon 410, many (in this embodiment, for example being 4) optical fiber 11 are arranged in parallel, and, outside these optical fiber that are arranged in parallel 11 whole, place and the whole length at optical fiber 11 on whole coating sheath 12.Omission is to the detailed explanation of the detailed structure and the feature of fibre ribbon 410.
In the fibre ribbon 410 of this embodiment, the thickness setting of sheath 12 must be littler than the thickness of the sheath 12 of the fibre ribbon that has used in correlation technique.Here, the maximum thickness of supposing fibre ribbon 410 is that the external diameter of T (μ m) and optical fiber 11 is d (μ m), can calculate the thickness t of sheath 12 based on formula t=(T-d)/2.In fibre ribbon 410, the thickness t of sheath 12 is set to such an extent that this thickness satisfies T≤d+40 (μ m), that is, the thickness t of sheath 12 becomes and is equal to or less than 20 μ m.
Utilization has the fibre ribbon 410 of thin sheath 12, can obtain to be very easy to take out the optical cable 401 of intermediate fibres band with low cost.
In this way, in fibre ribbon 410, because the thickness t of sheath 12 is less, therefore, the manual operations by the operator or use branch's instrument to produce the crack in sheath 12 or delaminate begins to peel off sheath 12 easily.Correspondingly, by peeling off sheath 12 from fibre ribbon 410, optical fiber 11 easy branches.That is to say that fibre ribbon 410 has the structure of being convenient to carry out the intermediate column branch operation.
Further, be used to carry out the method for intermediate column branch according to the above step execution of having explained in conjunction with Fig. 2 A-2C.
Here, the relation between branch's operability when carrying out intermediate column branch shown in the table 26 and charged loss increase, this relation is difference along with the difference of the thickness t of sheath 12.Further, table 26 illustrates the separating experiment result of expression optical fiber integrality intensity.Here, the optical fiber outside diameter d of fibre ribbon shown in the table 26 is 250 μ m.Further, the Young modulus of the resin of formation sheath 12 is 900MPa.
[table 26]
| Tape thickness T (μ m) | 250 | 251 | 260 | 270 | 275 | 280 | 290 | 300 | 310 | 320 |
| Tape tree fat thickness t (μ m) | 0.0 | 0.5 | 5 | 10 | 12.5 | 15 | 20 | 25 | 30 | 35 |
| Intermediate column branch character | Very good | Very good | Good | Good | Good | Good | All right | Bad | Bad | Bad |
| Charged loss increases | Good | Good | Good | Good | Good | All right | All right | Bad | Bad | Bad |
| Having or do not have optical fiber separates | Bad | Good | Good | Good | Good | Good | Good | Good | Good | Good |
Here, jacket thickness t is that 0.0 fibre ribbon represents that as shown in figure 10 resin does not cover the fibre ribbon of whole optical fiber in the table 26.
When the branch of intermediate column shown in the table 26 character is illustrated in and suppresses loss and increase to the value that is equal to or less than 1.0dB, the center section of fibre ribbon is branched into the easy degree of each optical fiber.For the assessment level that in this instructions, uses, " very good " expression on average can be carried out branch in 2 minutes, " good " expression on average can surpass 2 minutes and carrying out branch in 3 minutes, and " all right " then represented on average can surpass 3 minutes and carried out branch within 5 minutes.Further, " bad " expression branch operation on average needed above 5 minutes.
Further, when the loss increase when branch is equal to or less than 1.0dB, means and to carry out charged branch.
Here, explain and the relevant experiment of intermediate column branch character.
At first, shown in Figure 30 A, the sheath at fibre ribbon 410 two ends is removed about 1m at each end, then, takes out fibre ribbon 410.Secondly, the two ends of fibre ribbon 410 are separated into single fiber respectively, and the light source 420 that is used to launch 1.55 mum wavelength light is connected to the optical fiber 11a of principal fiber on a side, and optical receiver 421 and storage oscilloscope 422 are connected to the optical fiber 11a of principal fiber on opposite side.Under this state, the light of wavelength 1.55 μ m is launched from light source 420, and incides on the optical fiber 11a of principal fiber.Incident light is sent to the opposite side of optical fiber 11a, and is received by optical receiver 421.Receive the amount of light with suitable number of times observation post by storage oscilloscope 422.
Then, shown in Figure 30 B, continue at the light of light source 420 under the state of incident, utilize the notch on the center section of optical cable 401 and remove sheath 50cm.Take out fibre ribbon 410, and carry out the intermediate column branch of fibre ribbon 410.That is to say, be under the state of electriferous state that fibre ribbon 410 branches into simple optical fiber (charged branch) at the first optical fiber 11a.At this moment, measure the loss recruitment (increment) that causes because of intermediate column branch by storage oscilloscope 422.
At this, the length setting that is used for the part of intermediate column branch is 40cm.Further, according to the above step of being explained in conjunction with Fig. 2 A-2C, be used to carry out the method for intermediate column branch.
In the fibre ribbon shown in the table 26, the fibre ribbon that intermediate column branches into " very good ", " good " or " all right " has the tape thickness that is equal to or less than 290 μ m, i.e. T≤d+40 (μ m).In each such fibre ribbon, all can in 5 minutes, carry out intermediate column branch, the loss increase during simultaneously branch is restricted to the value that is equal to or less than 1.0dB.That is, can in 5 minutes, carry out charged branch.
On the other hand, for the correlation technique fibre ribbon with thicker sheath, wherein, tape thickness T exceeds 40 μ m than optical fiber outside diameter d, being evaluated as of intermediate column branch character " bad ".Loss during branch increases above 1.0dB, and perhaps, even can carry out branch, but branch surpasses 5 minutes at the required time, thereby, in fact can not carry out charged branch.
Charged loss increase shown in the table 26 is the loss recruitment that produces in intermediate column branch operation process.For the assessment level in this instructions, " very good " is illustrated in that the loss increase is no more than 0.1dB in the branch operation process, " good " is illustrated in that the loss increase is no more than 0.5dB in the branch operation process, and " all right " is illustrated in then that the loss increase is no more than 1.0dB in the branch operation process.Further, " bad " is illustrated in the recruitment of loss in the branch operation process above 1.0dB.
In fibre ribbon shown in the table 26, the fibre ribbon that its charged loss increases to " very good ", " good " or " all right " has the tape thickness T that is equal to or less than 290 μ m, i.e. T≤d+40 (μ m).In each such fibre ribbon, can chargedly carry out intermediate column branch, the loss when limiting branch simultaneously increases to the value that is equal to or less than 1.0dB.In these fibre ribbons, it is that the fibre ribbon of T≤d+25 (μ m) is preferred that tape thickness T is equal to or less than 275 μ m because charged loss increase be evaluated as " good ", and the recruitment of loss is further suppressed to be lower level.
On the other hand, for the correlation technique fibre ribbon with thicker resin, wherein, tape thickness T exceeds 40 μ m than optical fiber outside diameter d, increases relevant being evaluated as " bad " with charged loss, and the recruitment of loss surpasses 1.0dB in the branch operation process.
Optical fiber shown in the table 26 separates and whether has the result who represents separating experiment, and this result represents the intensity of optical fiber integrality.
At this, carry out separating experiment according to step shown in Figure 22.
For being used to assess the criterion that optical fiber separates in this instructions, " good " is illustrated in and do not separate between optical fiber and the resin and fibre ribbon remains whole formation in the longitudinal direction, and " bad " then represent the zone of generation optical fiber and resin isolation.
In fibre ribbon shown in the table 26, when thickness T satisfies T 〉=d+1 (μ m), do not produce the separation between the fibre ribbon, thereby be favourable.That is to say, should be understood that when the thickness t of resin is equal to or greater than 0.5 μ m, can obtain to keep each optical fiber to become whole sufficient intensity mutually.
In fibre ribbon shown in the table 26, when thickness T is assumed to be T=d (referring to Figure 10), although in this separating experiment, produce separated region, but, wait to control as squeezing to draw by the external force that in optical cable production line, reduces to affact on the fibre ribbon, can avoid in the optical cable manufacture process such as the defective that produces the band separation.Further, be assumed to be in this fibre ribbon of T=d in thickness T, because in by the zone on the ribbon thickness direction of each fiber optic hub, it is discontinuous that sheath is actually, therefore, each optical fiber separates on the Width of fibre ribbon easily, thereby, compare with the fibre ribbon that is configured to cover with sheath whole optical fiber, intermediate column branch character is favourable.
Further, do not cover among the fibre ribbon 10A of whole optical fiber 11A, only use the adhesion strength between resin 12aA and the optical fiber and make that each optical fiber 11A is whole to be formed at resin 12aA shown in Figure 10.On the other hand, for fibre ribbon shown in Figure 1A 10, owing to intactly cover whole optical fiber 11 with the resin that constitutes sheath 12, therefore, not only by the adhesion strength between resin and the optical fiber, and, so as to attempting to keep the intensity of himself shape, keep whole fibre ribbons 10 to become whole state by sheath 12 easily.
Below, explain another preference pattern that is contained in according to the fibre ribbon in the optical cable of third embodiment of the invention.
Shown in Figure 11 A, in fibre ribbon 410, for the sheath 112 that covers optical fiber 141, each recess that forms correspondingly forms each recessed portion 116 in sheath and between the adjacent fiber 111,111.Form base section 117 in recessed portion 116, wherein, base section 117 is the parts with maximum recess.For detailed formation and the feature relevant, omit in detail and explain with fibre ribbon 410b.
As mentioned above, from reducing the viewpoint that charged loss increases, the thickness of the sheath that forms on around the optical fiber 111 is preferred less to be favourable, and more preferably the thickness of sheath 12 is about 0.5 μ m.Yet, when reality is made this fibre ribbon, preferably guarantee a certain size thickness.Reason is, when attempting to make the resin that constitutes sheath thin, might the part application of resin (this phenomenon is called " resin deficiency ") not.Correspondingly, for optical fiber 111, being preferably formed thickness is 2.5 μ m or bigger sheath.In the case, for reducing the amount of resin on the ribbon thickness direction and guaranteeing the resin thickness of appointment simultaneously, can reduce the resin that between the recess of adjacent fiber, forms.The part that the resin deficiency takes place is that the optical fiber external diameter has peaked part on the ribbon thickness direction, thereby the minimizing of amount of resin does not hinder the reliable coating of resin between the adjacent fiber.
Correspondingly, the charged loss that the formation of recessed portion 116 shown in Figure 11 A can be suppressed at when carrying out intermediate column branch increases, and prevents the resin deficiency simultaneously.
Further, for the fibre ribbon that is contained in this embodiment optical cable, can enumerate the fibre ribbon 110A shown in Figure 13 A, fibre ribbon 110A is the pattern that the formation by fibre ribbon 110 shown in local modification Figure 11 A obtains.
Here, for the degree of depth of the recessed portion that in Figure 11 A and resin shown in Figure 13, forms, examination: by being arranged in parallel multifiber and by they being become prevent when integral body is made fibre ribbon optical fiber from separating; When carrying out the fitting operation of fibre ribbon, prevent to peel off (becoming the reason that optical fiber separates); The perhaps increase of loss or reduce in favourable branch operation or charged branching process.As a result, recessed portion is preferably formed to such an extent that make recessed portion be no more than the common tangent that is formed by adjacent fiber.That is to say, than common tangent more a side of the inside to form recessed portion be favourable.
Following specific explanations examination result.
Be set at the situation of 270 μ m, 280 μ m and 290 μ m for the thickness T (μ m) of fibre ribbon, calculate asynchronous ratio t/Y of degree of depth Y (μ m) and ratio g/d when recessed portion, and, intermediate column branch character and the charged loss examined under the various situations increase, wherein, ratio t/Y is the thickness t (μ m) of resin and the ratio of the degree of depth Y (μ m) of recessed portion, and ratio g/d is that fibre ribbon is at the ratio of the thickness g of recess office (μ m) with the outside diameter d (μ m) of optical fiber.
Relation between intermediate column branch's character and charged loss increase when the thickness T of fibre ribbon is 270 μ m shown in the table 27.Here, the ratio in the form (T-d)/2Y is the value identical with t/Y.
[table 27]
| Tape thickness T (μ m) | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 | 270 |
| Dai Shu Bi thickness t (μ m) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/ | 10 | 5 | 2 | 1 | 0.5 | 0.333 | 0.25 | 0.2 | 0.1 |
| Ratio g/d | 1.072 | 1.064 | 1.04 | 1 | 0.92 | 0.84 | 0.76 | 0.68 | 0.28 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | Good | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good |
Relation between intermediate column branch's character and charged loss increase when the thickness T of fibre ribbon is 280 μ m shown in the table 28.
[table 28]
| Tape thickness T (μ m) | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 | 280 |
| Dai Shu Bi thickness t (μ m) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| The recessed degree of depth Y of army (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/ | 15 | 7.5 | 3 | 1.5 | 0.75 | 0.5 | 0.375 | 0.3 | 0.15 |
| Ratio g/d | 1.112 | 1.104 | 1.08 | 1.04 | 0.96 | 0.88 | 0.8 | 0.72 | 0.32 |
| Intermediate column branch character | Good | Good | Very good | Very good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | All right | Good | Good | Very good | Very good | Very good |
Relation between intermediate column branch's character and charged loss increase when the thickness T of fibre ribbon is 290 μ m shown in the table 29.
[table 29]
| Tape thickness T (μ m) | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 | 290 |
| Tape tree fat thickness t (μ m) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Recessed portion degree of depth Y (μ m) | 1 | 2 | 5 | 10 | 20 | 30 | 40 | 50 | 100 |
| Ratio (T-d)/2Y | 20 | 10 | 4 | 2 | 1 | 0.667 | 0.5 | 0.4 | 0.2 |
| Ratio g/d | 1.152 | 1.144 | 1.12 | 1.08 | 1 | 0.92 | 0.84 | 0.76 | 0.36 |
| Intermediate column branch character | All right | All right | Good | Good | Very good | Very good | Very good | Very good | Very good |
| Charged loss increases | All right | All right | All right | All right | All right | All right | All right | Good | Good |
As show shown in the 27-table 29, increasing both for intermediate column branch character and charged loss, the degree of depth Y of recessed portion is big more, just obtains good more result.
Further, when the thickness T of fibre ribbon is 270 μ m or 280 μ m when being T≤d+30 (μ m), the advantageous particularly as a result that charged loss increases.Can think this be because: when the branch instrument that uses shown in Figure 12 A-Figure 12 C,, improve branch's character because the advantageous effects of recessed portion is compared with the fibre ribbon that resin only forms thinly.For example, though when shown in table 27, when tape thickness T is 270 μ m, intermediate column branch character is " good ", still, and when shown in table 29, tape thickness is that the degree of depth Y of 280 μ m and recessed portion is when being set at 5 μ m, intermediate column branch character is " very good ", correspondingly, confirms the advantageous effects of recessed portion.
Further, should be understood that the intermediate column branch character especially value with ratio (T-d)/2Y is relevant when paying close attention to intermediate column branch character.For example, when ratio (T-d)/when 2Y is equal to or less than 4.0, intermediate column branch character is for well.
Further, when ratio g/d is equal to or less than 1.0, promptly when the base section of recessed portion is positioned at optical fiber common tangent inboard, intermediate column branch character is for well, and charged loss increases step-down, and, when ratio g/d is equal to or less than 1.0, further obtain favourable effect.
Forming shown in Figure 11 A or Figure 13 A in the fibre ribbon of recessed portion, it is favourable forming recessed portion with level and smooth curved shape R.For example, this be because: when the base section of recessed portion had the sharp shape consistent with the fibre ribbon shape, stress concentrated on base section, thereby, be easy to generate crackle and fracture.
Further, shown in Figure 1A, Figure 10, Figure 11 A and Figure 13 A, in optical cable of the present invention in the used fibre ribbon, the loss that the adhesion strength between optical fiber and the sheath (resin) influences when carrying out charged branch sometimes increases and hot line job efficient.For the adhesion strength of optical fiber and resin, consider to prevent that loss from increasing and branch's operability that the adhesion strength of every optical fiber is favourable in the scope of 0.245 (mN)-2.45 (mN).When above-mentioned adhesion strength than above-mentioned scope more hour, cause following situation sometimes: sheath (resin) fracture when forming optical cable, and optical fiber is disconnected from each other.Further, when above-mentioned adhesion strength was bigger than above-mentioned zone, branch's character descended.
By above method measuring optical fiber of explaining in conjunction with Fig. 5 and Fig. 6 and the adhesion strength between the resin.
In the used fibre ribbon of the present invention, when fundamental purpose of the present invention is a being kept perfectly property of optical fiber and when not separating mutually, it is favourable that the thickness of resin is equal to or greater than 0.5 μ m.In the case, the maximum ga(u)ge T of fibre ribbon becomes T 〉=optical fiber outside diameter d+1 (μ m).
Loss when further, the resin properties of fibre ribbon also influences charged branch sometimes increases or branch operation efficient.For the material character of resin, yield point stress is favourable in the scope of 20MPa-45MPa, and, carry out branch operation easily, and can be suppressed at the loss when carrying out charged branch.According to JIS K7113, under 50mm/ minute draw speed, measure the yield point stress of No. 2 sample.When yield point stress during less than 20MPa, occur following situation sometimes: fibre ribbon is formed in the step of optical cable, and each optical fiber separates because of the external force that affacts on the optical fiber, thereby fibre ribbon can not form optical cable.When yield point stress surpasses 45MPa, be difficult to make the resin fracture, thereby, the intermediate column branch that is difficult to carry out fibre ribbon.
Further, at this,, measure the loss value under the usual terms of wavelength 1.55 μ m and the loss recruitment of intermediate column branch for optical cable 401 shown in Figure 29.
Here, used in this embodiment optical cable 401 has the overall width of 6.0mm, the thickness of 2.0mm, and simultaneously, Support Level 7 and tensile strength complete 402 are made by steel wire.
Further, used in this embodiment fibre ribbon is the fibre ribbon 110A shown in Figure 13 A, and the thickness T of fibre ribbon 110A is 270 μ m.The outside diameter d of optical fiber 11 is 250 μ m.Further, the thickness t of resin is 10 μ m, and the degree of depth of recessed portion is 50 μ m.Yet, form the optical fiber of fibre ribbon for integral body, the situation of using the optical fiber that meets G652 is provided and uses mode field diameter to be equal to or less than the situation of the optical fiber of 10 μ m, and, the measurement result of each situation of comparison is provided.
For the loss value of optical fiber under the condition that covers optical fiber at the cable jacket 403 that is used as optical cable 401, when use met the optical fiber of G652, maximal value was that 0.22dB/km and mean value are 0.20dB/km.When using mode field diameter to be equal to or less than the optical fiber of 10 μ m, maximal value is that 0.21dB/km and mean value are 0.19dB/km.
In this way, for the fiber transmission attenuation under the state that forms optical cable at optical fiber, the optical fiber that mode field diameter is equal to or less than 10 μ m shows especially favorable properties.
Further, according to the method shown in Figure 30 A-30B, optical cable is carried out intermediate column branch, so that measure its loss.
Remove sheath 403 beginnings until the operation of finishing the intermediate column branch that uses storage oscilloscope 422 by observing, measure loss from optical cable 401.
As a result, for the loss recruitment in the operating process, use meet G652 optical fiber situation and use mode field diameter to be equal to or less than in the situation of optical fiber of 10 μ m, can not discern the value that is equal to or greater than 0.1dB.
In this way, the waste that increases during column branch in commission is that the optical cable that is equal to or less than the value of 1.0dB can advantageously be carried out intermediate column branch under charged condition, thereby, can be suitably branch and take out the optical fiber of wishing only, and use other optical fiber in the downstream.Correspondingly, effectively utilize the whole optical fiber that are contained in the optical cable.Correspondingly, the constructions cost of communication line can be controlled in reduced levels.
Further, even when carrying out high-speed communication by unbranched optical fiber, even perhaps when executive communication in the less zone of dynamic range, also the loss that can increase when carrying out intermediate column branch is suppressed to the optical cable of the value that is equal to or less than 0.5dB branch and takes out the optical fiber of wishing.Correspondingly, the flexibility ratio in the time of can significantly increasing the design optical communication networks.
Below, explain optical cable according to another pattern of the present invention.
In optical cable shown in Figure 33 432, cover fibre ribbon 410 and two tensile strength bodies 402 with the sheath 403a that is roughly circular contour.Also in sheath 403a, form two notches 404.
In optical cable shown in Figure 34 433, with sheath 403b covering fibre ribbon 410 and two tensile strength bodies 402 of circular contour.Although in sheath 403b, do not form notch, two of being used to tear sheath 403b are installed in adjacent fibre ribbon 410 tear rope 434.When taking out fibre ribbon 410, these are torn rope 434 and move sheath 403b outside to by the mutual opposite steering handle in edge, can tear sheath 403b.
Optical cable 435 shown in Figure 35 is made of fibre ribbon 410, two tensile strength bodies 402 and sheath 403.Two notches 404 that in sheath 403, form not form on the zone identical on the thickness direction and not on fibre ribbon 410 Widths in be formed centrally, but the end on fibre ribbon 410 Widths forms each notch 404.In this way, by forming two notches 404 in asymmetric position,, take out fibre ribbon easily because of this structure when when these notches 404 are torn sheath 403.
In optical cable shown in Figure 36 436, with optical cable 431 shown in Figure 32 similarly, cover two fibre ribbons 410 and two tensile strength bodies 402 together with sheath 403.Yet two fibre ribbons 410 are contained in the collection hole 437 that forms in sheath 403, and not exclusively contact with sheath 403.That is to say, between fibre ribbon 410 and sheath 403, the inner chamber 438 in collection hole 437 is installed.In the case, when optical cable 436 bendings or distortion, because fibre ribbon 410 always is not out of shape with sheath 403, therefore, the loss increase can be suppressed to reduced levels.Further, when when tearing sheath 403 from notch 404 and take out fibre ribbon 410, the friction force that causes because of the sheath displacement does not directly affact on the fibre ribbon 410, thereby, can prevent that undesirable fibre ribbon 410 from separating.
Further, with optical cable 439 shown in Figure 37 similarly, can spacer 440 be installed in collection with fibre ribbon 410 in the hole 437.Here, spacer 440 is for example for reducing the spacer of frictional resistance between fibre ribbon 410 and the sheath 403, as oil, talcum powder etc., perhaps can be the fibrous type yarn that is formed by the polypropylene with tensile strength body function etc.
Further, with optical cable 441 shown in Figure 38 similarly, do not form the collection hole, but banded medium 440a can be installed, wherein, medium 440a is arranged to place medium 440a along fibre ribbon 410.
As explained above, for optical cable according to the present invention, the example of various aspects can be shown.
At this,, except the fibre ribbon 10 that illustrates in the drawings, can use above-mentioned fibre ribbon 10A, 110,110A for the fibre ribbon of optical cable 430,431,432,433,435,436,439,441.
Further, for the resin that covers the cable jacket on the fibre ribbon, can use thermoplastic resin.Further, in order to reduce weight or character is torn in raising when taking out fibre ribbon, sheathing resin can foam.
In this article, fibre ribbon as shown in figure 13 according to the present invention is not limited to satisfy and concerns T≤d+40 (μ m), and, be arranged in the common tangent that sheath in the recessed portion is no more than adjacent fiber, wherein, recessed portion forms between adjacent fiber.
In having this fibre ribbon of this structure, when branch optical fiber from integrally formed fibre ribbon, possible branch optical fiber easily is because cover the common tangent that the sheath of recessed portion between the optical fiber is no more than optical fiber.
As explained above, in fibre ribbon according to the present invention, when forming fibre ribbon in optical cable, fibre ribbon can keep not separating mutually, and, the easy branch of each optical fiber.
As explained above, by optical cable according to the present invention, be easy to the fibre ribbon that is contained in the optical cable is carried out intermediate column branch.
As explained above,, be easy to the fibre ribbon that is contained in the optical cable is carried out intermediate column branch by optical cable according to the present invention, and, PMD can be reduced.
Claims (51)
1. fibre ribbon comprises:
The multifiber that is arranged in parallel; And
Make multifiber become whole resin on whole length of optical fiber, optical fiber and resin are in the state of optical fiber and the mutual tight adhesion of resin,
Wherein, the maximum thickness of supposing fibre ribbon is that the external diameter of T (μ m) and optical fiber is d (μ m), opening relationships T≤d+40 (μ m).
2. fibre ribbon as claimed in claim 1 wherein, makes multifiber become integral body by the entire circumference that covers the multifiber that is in the state of being arranged in parallel with resin.
3. fibre ribbon as claimed in claim 2, wherein, opening relationships T≤d+20 (μ m).
4. fibre ribbon as claimed in claim 2, wherein, in the xsect of fibre ribbon, in the interior zone of determining by following two straight lines, wherein, the straight line quadrature at described two straight lines and each center that is connected two adjacent fibers and pass each centers of two adjacent fibers respectively
Suppose that Young modulus is that E and cross-sectional area are S, the ES product of resin is equal to or less than 0.031 with the ratio of the ES product of optical fiber, and the Young modulus of resin is equal to or greater than 200MPa.
5. fibre ribbon as claimed in claim 4, wherein, in the xsect of fibre ribbon, in the interior zone of determining by following two straight lines, wherein, the straight line quadrature at described two straight lines and each center that is connected two adjacent fibers and pass each centers of two adjacent fibers respectively
Suppose that Young modulus is that E and cross-sectional area are S, the ES product of resin is set at 0.026 or littler with the ratio of the ES product of optical fiber.
6. fibre ribbon as claimed in claim 2, wherein, recess correspondingly forms recessed portion in resin and between the adjacent fiber.
7. fibre ribbon as claimed in claim 6, wherein, the degree of depth of supposing recessed portion is Y (μ m), opening relationships (T-d)/2Y≤4.0.
8. fibre ribbon as claimed in claim 6, wherein, multifiber contacts with each other.
9. fibre ribbon as claimed in claim 6 wherein, supposes that the thickness of fibre ribbon in resin recess office is g, opening relationships g≤d (μ m).
10. fibre ribbon as claimed in claim 9, wherein, opening relationships g≤0.8d (μ m).
11. fibre ribbon as claimed in claim 6, wherein, the macrobending loss of the optical fiber of bending diameter 15 (mm) under wavelength 1.55 (μ m) is equal to or less than 0.1 (dB/ circle).
12. as claim 2 or 6 described fibre ribbons, wherein, for each root optical fiber, the adhesion strength between optical fiber and the resin at 0.245 (mN) to the scope of 2.45 (mN).
13. as claim 2 or 6 described fibre ribbons, wherein, the yield point stress of resin at 20 (MPa) to the scope of 45 (MPa).
14. as claim 2 or 6 described fibre ribbons, wherein, when the loss that increases during from the fibre ribbon branch optical fiber under electriferous state is equal to or less than 1.0 (dB).
15. as claim 2 or 6 described fibre ribbons, wherein, optical fiber is equal to or less than 10 (μ m) based on the mode field diameter of Petermann-I definition when wavelength 1.55 (μ m).
16. as claim 2 or 6 described fibre ribbons, wherein, the polarisation mode dispersion that is in the fibre ribbon in the loose coiling state is equal to or less than 0.2 (ps/km
1/2).
17. a fibre ribbon comprises:
The multifiber that under the state that optical fiber contacts with each other, is arranged in parallel; And
Make multifiber become whole resin by the entire circumference that covers multifiber,
Wherein, form resin on whole length of fibre ribbon, simultaneously, be arranged in the common tangent that resin in the recessed portion is no more than adjacent fiber, wherein, recessed portion forms between adjacent fiber.
18. the optical cable with one or more fibre ribbon, described fibre ribbon comprises the multifiber that is arranged in parallel; And on whole length of optical fiber, make multifiber become whole resin, optical fiber and resin are in the state of optical fiber and the mutual tight adhesion of resin,
Wherein, the maximum thickness of supposing fibre ribbon is that the external diameter of T (μ m) and optical fiber is d (μ m), opening relationships T≤d+40 (μ m).
19. optical cable as claimed in claim 18, wherein, fibre ribbon is configured to: make multifiber become integral body by the entire circumference that covers the multifiber that is in the state of being arranged in parallel with resin.
20. optical cable as claimed in claim 19, wherein, recess correspondingly forms recessed portion in the resin of fibre ribbon and between the adjacent fiber.
21. optical cable as claimed in claim 20, wherein, fibre ribbon is configured to: the degree of depth of supposing recessed portion is Y (μ m), opening relationships (T-d)/2Y≤4.0.
22. optical cable as claimed in claim 21, wherein, fibre ribbon is configured to: suppose that the thickness of fibre ribbon in the recess office is g, opening relationships g≤d (μ m).
23. optical cable as claimed in claim 22, wherein, fibre ribbon is configured to: opening relationships g≤0.8d.
24., further comprise as claim 19 or 20 described optical cables:
Spacer, wherein, described spacer have be roughly columniform plastics prolate body and therein pericardium draw together the tensile strength body,
Wherein, on the peripheral surface of prolate body, form the roughly groove of spirality, and, in the groove inner stacks and hold one or more fibre ribbon.
25. optical cable as claimed in claim 24, wherein, along the longitudinal direction spirality grooving in one direction of spacer.
26. optical cable as claimed in claim 25, wherein, in all optical fiber in being contained in groove, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.05 (ps/km
1/2).
27. optical cable as claimed in claim 24, wherein, groove is spiralization in the following manner: the hand of spiral of groove is alternately reverse along the longitudinal direction of spacer.
28. optical cable as claimed in claim 27, wherein, in all optical fiber in being contained in groove, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.2 (ps/km
1/2).
29., further comprise as claim 19 or 20 described optical cables:
Be roughly columniform extension tubing, in extension tubing, hold one or more fibre ribbon with overlapped way.
30. optical cable as claimed in claim 29 wherein, is contained in one or more fibre ribbon that is roughly in the columniform extension tubing with the colloidal cpd covering.
31. optical cable as claimed in claim 30, wherein, in being contained in all optical fiber that are roughly in the columniform extension tubing, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.05 (ps/km
1/2).
32. optical cable as claimed in claim 29 wherein, is contained in one or more fibre ribbon that is roughly in the columniform extension tubing with the yarn covering.
33. optical cable as claimed in claim 32, wherein, in being contained in all optical fiber that are roughly in the columniform extension tubing, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.2 (ps/km
1/2).
34. optical cable as claimed in claim 29, wherein, holding the columniform extension tubing of being roughly of one or more fibre ribbon twists in the following manner: on the longitudinal direction of tensile strength body, it is alternately reverse around the direction of twist of tensile strength body to be roughly columniform extension tubing.
35. optical cable as claimed in claim 34, wherein, in being contained in all optical fiber that are roughly in the columniform extension tubing, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.2 (ps/km
1/2).
36. optical cable as claimed in claim 29 wherein, holds the columniform extension tubing of being roughly of one or more fibre ribbon and twists around the tensile strength body in the direction in the longitudinal direction upper edge of tensile strength body.
37. optical cable as claimed in claim 36, wherein, in being contained in all optical fiber that are roughly in the columniform extension tubing, the link polarisation mode dispersion of any wavelength in scope 1.26 (μ m)-1.65 (μ m) is equal to or less than 0.2 (ps/km
1/2).
38., further comprise as claim 19 or 20 described optical cables:
Be used to cover the sheath of one or more fibre ribbon.
39. optical cable as claimed in claim 38, wherein, one or more fibre ribbon and sheath are adhered to one another.
40. optical cable as claimed in claim 38 wherein, forms the clearance between one or more fibre ribbon and sheath.
41. optical cable as claimed in claim 38, wherein, spacer is arranged between one or more fibre ribbon and the sheath.
42. as claim 19 or 20 described optical cables, wherein, fibre ribbon is configured to: in the xsect of fibre ribbon, in the interior zone of determining by following two straight lines, wherein, the straight line quadrature at described two straight lines and each center that is connected two adjacent fibers also passes each centers of two adjacent fibers respectively
Suppose that Young modulus is that E and cross-sectional area are S, the ratio of the ES product of resin and the ES sum of products of optical fiber is equal to or less than 0.026.
43. optical cable as claimed in claim 42, wherein, fibre ribbon is configured to: in the xsect of fibre ribbon, in the interior zone of determining by following two straight lines, wherein, the straight line quadrature at described two straight lines and each center that is connected two adjacent fibers also passes each centers of two adjacent fibers respectively
The ratio of the ES product of resin and the ES sum of products of optical fiber is equal to or less than 0.020.
44. as claim 19 or 20 described optical cables, wherein, fibre ribbon is configured to: for each root optical fiber, the adhesion strength between optical fiber and the resin at 0.245 (mN) to the scope of 2.45 (mN).
45. as claim 19 or 20 described optical cables, wherein, fibre ribbon is configured to: the yield point stress of resin at 20 (MPa) to the scope of 45 (MPa).
46. as claim 19 or 20 described optical cables, wherein, fiber configuration is: optical fiber is equal to or less than 10 (μ m) based on the mode field diameter of Petermann-I definition when wavelength 1.55 (μ m).
47. as claim 19 or 20 described optical cables, wherein, fibre ribbon is configured to: when the loss that increases during from the fibre ribbon branch optical fiber under electriferous state is equal to or less than 1.0 (dB).
48. as claim 2 or 6 described fibre ribbons, wherein, the macrobending loss of the optical fiber of bending diameter 15 (mm) under wavelength 1.55 (μ m) is equal to or less than 0.1 (dB/ circle).
49. as claim 19 or 20 described optical cables, wherein, multifiber contacts with each other.
50. as claim 19 or 20 described optical cables, wherein, the macrobending loss of the optical fiber of bending diameter 15 (mm) under wavelength 1.55 (μ m) is equal to or less than 0.1 (dB/ circle).
51. the optical cable with one or more fibre ribbon, described fibre ribbon comprises: the multifiber that is arranged in parallel under the state that optical fiber contacts with each other; And make multifiber become whole resin by the entire circumference that covers multifiber,
Wherein, form resin on whole length of fibre ribbon, simultaneously, be arranged in the common tangent that resin in the recessed portion is no more than adjacent fiber, wherein, recessed portion forms between adjacent fiber.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP323074/2002 | 2002-11-06 | ||
| JP2002323074 | 2002-11-06 | ||
| JP129269/2003 | 2003-05-07 | ||
| JP154941/2003 | 2003-05-30 | ||
| JP189779/2003 | 2003-07-01 | ||
| JP193162/2003 | 2003-07-07 | ||
| JP205809/2003 | 2003-08-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1717605A true CN1717605A (en) | 2006-01-04 |
| CN100516955C CN100516955C (en) | 2009-07-22 |
Family
ID=35822563
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801042213A Expired - Lifetime CN100516955C (en) | 2002-11-06 | 2003-11-06 | Optical fiber ribbon and optical fiber cable using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100516955C (en) |
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| CN101512404B (en) * | 2007-08-22 | 2012-10-10 | 古河电气工业株式会社 | Fiber-optical zonal core thread |
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| CN105518498A (en) * | 2013-07-26 | 2016-04-20 | 康宁光电通信有限责任公司 | Fiber Optic Ribbon |
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| CN1005654B (en) * | 1984-11-29 | 1989-11-01 | 菲利浦光灯制造公司 | Optical flat type cable, method of manufacturing same and an optical cable composed of several flat type cable |
| NO914353L (en) * | 1991-11-07 | 1993-05-10 | Alcatel Stk As | FIBEROPTIC CABLE |
| FR2693560A1 (en) * | 1992-07-10 | 1994-01-14 | Alcatel Cable | Cylindrical fibre=optic cable with fibres arranged around central core - binds fibres together in flexible resin which is then rolled up into cylindrical cable form incorporating cord to rip open resin to re-form ribbon |
| JPH07113915A (en) * | 1993-10-20 | 1995-05-02 | Sumitomo Electric Ind Ltd | Separating tool for multifiber coated optical fiber ribbon |
| US5457762A (en) * | 1994-06-13 | 1995-10-10 | Siecor Corporation | Fiber optic ribbon |
| US5717805A (en) * | 1996-06-12 | 1998-02-10 | Alcatel Na Cable Systems, Inc. | Stress concentrations in an optical fiber ribbon to facilitate separation of ribbon matrix material |
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| CN101512404B (en) * | 2007-08-22 | 2012-10-10 | 古河电气工业株式会社 | Fiber-optical zonal core thread |
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| CN105518498A (en) * | 2013-07-26 | 2016-04-20 | 康宁光电通信有限责任公司 | Fiber Optic Ribbon |
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| CN106054330B (en) * | 2015-04-01 | 2019-10-22 | 住友电气工业株式会社 | Optical cable |
| CN107209337B (en) * | 2015-04-07 | 2020-05-22 | 株式会社藤仓 | Loose tube, loose tube type optical fiber cable, method for separating single core of optical fiber ribbon of loose tube, method for manufacturing loose tube, and method for collecting a plurality of optical fibers |
| CN107209337A (en) * | 2015-04-07 | 2017-09-26 | 株式会社藤仓 | Loose tube, Loose tube type fiber optic cables, the single separation method of the fibre ribbon of Loose tube, the collection line method of the manufacture method of Loose tube and multifiber |
| CN109642998A (en) * | 2016-07-27 | 2019-04-16 | 普睿司曼股份公司 | Flexible optical fibre band |
| CN109642998B (en) * | 2016-07-27 | 2020-05-15 | 普睿司曼股份公司 | Flexible optical fiber ribbon |
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| CN116594133B (en) * | 2023-07-17 | 2023-09-19 | 江苏永鼎股份有限公司 | Optical fiber ribbon cable with foldable parts |
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| CN100516955C (en) | 2009-07-22 |
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