CN100392451C - Optical fiber coupler and process and device for producing the same - Google Patents
Optical fiber coupler and process and device for producing the same Download PDFInfo
- Publication number
- CN100392451C CN100392451C CNB2004800365109A CN200480036510A CN100392451C CN 100392451 C CN100392451 C CN 100392451C CN B2004800365109 A CNB2004800365109 A CN B2004800365109A CN 200480036510 A CN200480036510 A CN 200480036510A CN 100392451 C CN100392451 C CN 100392451C
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- fiber
- mentioned
- linearity
- optically
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A conventional optical fiber coupler requires a preprocessing process or different optical fibers having strictly uniform characteristics. The inventive optical fiber coupler is a 1x2 wide band optical fiber coupler for branching or coupling propagating lights between an optical fiber (1a) and an optical fiber (1b). Both optical fibers (1a, 1b) are identical single-mode optical fibers available on the market as a standard type. An optical coupling part (21) of the optical fiber coupler is formed by fusing and elongating the optical fibers (1a, 1b) with a part of the optical fiber (1b) kept wound around the optical fiber (1a). Winding amount of the optical fiber (1b) with respect to the optical fiber (1a) is adjusted such that the difference in length between both optical fibers (1a, 1b) at the optical coupling part (21) is equal to the minimum possible length required for substantially equalizing the degrees of coupling of propagating lights at the optical fibers (1a, 1b).
Description
Technical field
The present invention relates in optical communication system or light sensing system etc., be used for light signal branch, be coupled, close fiber coupler and the manufacture method and the manufacturing installation of partial wave etc., relate in particular to the optical branch coupling mechanism (optical fiber splitter) of optical fiber coupled mode.
Background technology
In optical communication system,, there is the light that adopts a plurality of wavelength to carry out the wavelength multichannel communication multiple telecommunication mode of information transmit-receive for carrying out jumbo communication.In the optical communication system of wavelength multichannel communication multiple telecommunication mode, the fiber coupler that is used for optical monitoring signal, distribution etc., the light signal of a plurality of each wavelength is carried out branch comparably, just the branching ratio of each wavelength light, coupling ratio (right hereinafter referred to as optocoupler) can be not the key factor on the system and arranging because of wavelength difference changes.The fiber coupler that this kind wavelength characteristic is level and smooth, except that optical communication system, its scope of application is extensive, also is fit closely parts as the application in light sensing system etc.Therefore, the various less fiber couplers of wavelength interdependence that are used for being used in this optical communication system have been proposed.
For example shown in the patent documentation 1, for the broadband optical fiber coupler (1 * 2 fiber coupler or 2 * 2 fiber couplers) of 2 branches, be that to have transmission between each optical fiber poor by making, reduce the wavelength interdependence.When optically-coupled portion had different transmissions, optocoupler was combined into incomplete coupling, maximum degree of coupling less than 100%.Therefore, the difference by the control transmission constant can be controlled at the maximum degree of coupling of optically-coupled portion below 50%, and its result can realize being close to uniform branching ratio in broadband.Want to give difference to transmission, in optically-coupled portion, the external diameter of each optical fiber, core diameter, specific refractivity poor (cut-off) etc. must have otherness.
As broadband concrete grammar, can make transmission have difference by feat of same fibre is imposed pre-service, or use originally with regard to different optical fiber in optically-coupled portion.As the former example, wherein 1 heating in 2 identical optical fiber is made its stretching, and after forming the small diameter part with awl (taper) part, add the small diameter part of 1 optical fiber of hot-stretch at this, with the two optical fiber prestretched method (stretching) that stretches of welding in addition with reference to patent documentation 2 and patent documentation 3; Perhaps, for wherein 1 in 2 identical optical fiber, after the adulterant that makes core is adjusted index distribution through thermal diffusion, the core diffusion method (with reference to patent documentation 4) that two fused fiber splices are stretched, or etching method, polishing etc.As the latter's example, then be to use at external diameter, core diameter, the poor different optical fiber such as (cut-off) of specific refractivity.In addition, also can resemble shown in the patent documentation 5 the in addition former approach that stretches of welding and the combination of latter's method of the part of 2 optical fiber that the specific refractivity difference is different.
These methods, can change branching ratio by the asymmetry between control optical fiber, so not only can make 50: 50 etc. branch's fiber coupler, also can make resembling: 90: 10 do not wait branch's fiber coupler, be applied in the making of tap coupling mechanism (tap coupler) etc.
If be limited to 50: 50 etc. branch's fiber coupler, then not necessarily need be for broadband and give that transmission is had is poor.For example, can impose welding, stretching to 3 optical fiber side by side, and realize optical fiber with central authorities be input terminal, with 2 optical fiber at two ends be lead-out terminal 1 * 2 broadband, etc. branch's fiber coupler.
This formation also applicable multiple-limb, etc. branch's fiber coupler { 1 * N (N＞2) }, lean against around 1 input optical fibre symmetric offset spread N bar output optical fibre and after in addition welding stretches, just can make 1 * N broadband, etc. branch's fiber coupler.So, in this formation, just will use (N+1) bar optical fiber.In addition, in the case, be to avoid increasing some extra losses on the principle because of wavelength.
For fear of this loss, must 1 * N broadband, etc. in branch's fiber coupler, also import the asymmetry between optical fiber.Thereby, the solution that has proposed, the prestretching pulling method shown in the patent documentation 6 for example, be not wait branch's fiber coupler similarly with 2 branches are wide band, in identical many optical fiber 1, formation has the small diameter part of tapering part, carries out welding between other same fibre of small diameter part and stretches not having; Or, to many optical fiber provide equal tension on one side, is twined on one side and welding stretches, so that in the tapering formation asymmetry (with reference to patent documentation 7) of the welding stretched portion of fiber coupler
No. 2711351 communique of (patent documentation 1) Jap.P.
(patent documentation 2) special fair 6-040167 communique
No. 2645458 communique of (patent documentation 3) patent
No. 2958179 communique of (patent documentation 4) patent
No. 2848832 communique of (patent documentation 5) patent
The instructions that No. the 5751873rd, (patent documentation 6) United States Patent (USP).
The instructions that No. the 5883992nd, (patent documentation 7) United States Patent (USP).
Yet shown in patent documentation 1～4 described broadband method, when giving the transmission difference to same fibre by pre-service, being not only has increased pretreatment process, and the control good and the bad of this pretreatment procedure may be the key reason that reduces yield rate.Just the broadband character of branching ratio is extremely sensitive for treatment capacity (tapering shape, etch quantity, amount of grinding etc.), can't be revised after welding stretches.
Have again, as described in patent documentation 5 etc., use external diameter, core diameter, specific refractivity poor (cut-off) to wait, must order each optical fiber especially with strict integrity property from beginning broadband method with regard to different optical fiber, extremely uneconomical.Even obtained each optical fiber that this kind has strict integrity property, want to have a real non-easy thing of each parameter in the length direction strictness of optical fiber.Therefore, above-mentioned broadband method may be when producing fiber coupler, becomes the reason of deterioration fiber coupler or reduction yield rate.
As described in the broadband method of patent documentation 6, when using N bar optical fiber to make 1 * N wideband coupler, must impose stretch processing as pretreatment process to several optical fiber again.Use the method for N+1 bar optical fiber, as mentioned above, on principle, can increase the wavelength interdependence of extra loss as 1 * N fiber coupler.In addition, because branching ratio is branch such as to be limited to, therefore, can't make and not wait branch's fiber coupler etc. is its shortcoming.Moreover, as described in the broadband method of patent documentation 7, import the method in asymmetric tapering at 1 * N fiber coupler, the tapering must be required longer than reality, except what increase the total length of fiber coupler, its shortcoming still has the controlled problem of asymmetry tapering shape, is the main cause that reduces yield rate.
Summary of the invention
The present invention finishes in order to address the above problem, a kind of fiber coupler is provided, have the transmission that makes an optical fiber and be optically coupled to the optically-coupled portion of other one or more optical fiber, it is characterized in that: one or more optical fiber of this optical fiber and other, be by the pre-service that transmission is each other changed, and the identical optical fiber of transmission constitute.The optical fiber of this optical fiber and this other one or more is different in the length of optically-coupled portion, and the length of this optically-coupled portion is the right minimum length about equally of transmission optocoupler that makes each optical fiber at least two specific wavelengths.
According to this formation, for example, in part or all of optically-coupled portion, rely on a fiber configuration be in line shape or roughly linearity, make other one or more fiber configuration become S shape, just can make the length difference of each optical fiber, between each optical fiber of optically-coupled portion, import asymmetry with this way in optically-coupled portion.
Therefore, need not correctly use so that give the transmission of same optical fiber and produce poor pre-service, just can import asymmetry.In addition, because asymmetry controlled in the length of optically-coupled portion by each optical fiber, so, revise in the time of can stretching in the welding of each optical fiber of optically-coupled portion.Thereby, and pre-service amount sensitivity, the traditional fiber coupling mechanism that can't revise transmission when welding stretches are compared, the effect that improves yield rate can be arranged.
In addition, owing to need not prepare the strict complete different fiber of characteristic, so help economy.Moreover, owing to must not possess various parameters scrupulously at the length direction of optical fiber, thus can be in production the characteristic of deterioration fiber coupler, can not cause decrease in yield yet.
By each optical fiber of control at the length difference of optically-coupled portion, obtainable be not limited in 50: 50 etc. branching ratio, and can obtain any branching ratio.Therefore, not only applicable at 1 * 2 fiber coupler that does not wait branch, the also applicable fiber coupler that does not wait branch at 1 general * N.Moreover can not resemble broadband those problems that run into of tradition, just, when using N+1 bar optical fiber, will increase the problem of the wavelength interdependence of extra loss on the principle in order to obtain branch's fiber coupler such as 1 * N broadband.Moreover, can make the output input usefulness of an optical fiber dual-purpose, so can use the N bar optical fiber that reduces 1 to obtain the wide band fiber coupler of 1 * N at flashlight.For avoiding the problems referred to above, such when branch's fiber couplers such as 1 * N broadband use asymmetric tapering to be used for importing asymmetry, do not have the controlled problem of asymmetric tapering shape yet, become the reason that yield rate reduces.In addition, as when using asymmetric tapering to import asymmetry, can obtain branching ratio is wide band fiber coupler, and need not make the tapering be longer than actual required above length.
In addition, feature of the present invention is that also one or more optical fiber of an optical fiber and other is made of same optical fiber.
According to this formation, even if under the situation of using same optical fiber, differ from one another in the length of optically-coupled portion, just need not have difference in each optical fiber chien shih transmission by making each optical fiber, can be easily with asymmetry lead-in light coupling part.
Therefore, even if under the situation of using same optical fiber, also can obtain branching ratio easily is wide band above-mentioned fiber coupler.
In addition, method of making fiber optical couplers of the present invention, be to comprise the alignment process that many optical fiber are arranged each other, with the welding in addition of respectively this optical fiber that will arrange in this alignment process, stretch and the welding stretching process of formation optically-coupled portion, it is characterized in that: these many optical fiber are to be made of pre-service and the identical optical fiber of transmission that the transmission that does not all make in arbitrary optical fiber each other changes, this alignment process, be included in this optically-coupled portion, will at least 1 fiber configuration be in line shape or linearity roughly, the winding working procedure of around it, twining other optical fiber more than 1.
According to this formation, be wrapped in the linearity or the twining amount of other optical fiber of linearity optical fiber roughly by change, can adjust the length difference of each optical fiber in optically-coupled portion.
Therefore, be wrapped in the linearity or the twining amount of other optical fiber of linearity optical fiber roughly, can control the asymmetry between each optical fiber, easily obtain the fiber coupler that branching ratio has the broadband character of being wanted by change.
In addition, the present invention is in winding working procedure, all provides tension force to this optical fiber of many, and to being configured to the linearity or the tension force that optical fiber provided of linearity roughly, greater than the tension force that other optical fiber provided that is wrapped in this optical fiber.
According to this formation, utilization is provided than the linearity of hightension or the tension force of linearity optical fiber roughly, around this optical fiber, twine other optical fiber that are provided than small tension receiving coil, like this, just can with linearity or roughly linearity optical fiber be subjected to being wrapped in the bending that strength caused of other optical fiber around its, be suppressed at minimum level.
Therefore, linearity or roughly linearity optical fiber around when twining other optical fiber, can avoid because of linearity or roughly the linearity optical fiber twining amount that causes other optical fiber that bends can not keep constant situation.Just, other optical fiber to linearity or roughly the twining amount of linearity optical fiber can keep necessarily realizing the winding state of tool reproducibility easily.Therefore, make the complete fiber coupler of broadband character of branching ratio easily, improve yield rate.
In addition, fiber coupler manufacturing apparatus of the present invention, be to comprise the arrange agencie that many optical fiber are arranged each other, with each optical fiber that this arrange agencie is arranged welding in addition, stretching and form the welding drawing mechanism of optically-coupled portion, it is characterized in that: winding mechanism is to be configured to linearity or roughly around at least 1 optical fiber of linearity, to twine other optical fiber more than 1; And tension force provides mechanism all to provide tension force to this optical fiber of many, and will remain greater than the tension force that other optical fiber was provided that is wrapped in this optical fiber linearity or the tension force that provides of the optical fiber of linearity roughly are provided.
Constitute according to this, other optical fiber are wrapped in linearity or roughly around the linearity optical fiber by winding mechanism.When carrying out this winding, provide mechanism to provide set tension force by tension force to each optical fiber, in view of the above, linearity or roughly linearity optical fiber can not be subjected to being wrapped in the strength of other optical fiber around it and bend, other optical fiber to linearity or roughly the twining amount of linearity optical fiber can keep necessarily.
Therefore, can provide a kind of by its length difference, easily control asymmetrical fiber coupler manufacturing apparatus between optical fiber in the optically-coupled portion.
According to this invention, as previously mentioned, need not correctly carry out having the pre-service of difference in advance for the transmission that makes same optical fiber, and need not prepare the rigorous complete different fiber of characteristic, can be with asymmetry lead-in light coupling part, thus the broadband optical fiber coupler that the wavelength interdependence is low, fiduciary level is high of optical branch ratio can be obtained with low price.Can realize the fiber coupler of 1 * N of any branching ratio with N bar optical fiber.
Again, the manufacture method of fiber coupler provided by the present invention and manufacturing installation thereof, can control asymmetry between each optical fiber to the twining amount of an optical fiber by changing other optical fiber, make the photo-coupler that branching ratio has desirable broadband character with good productivity.
Description of drawings
Shown in Figure 1 is the stereographic map that the summary around the optically-coupled portion of fiber coupler of the 1st embodiment of the present invention constitutes;
Shown in Figure 2 is the side view that the optical fiber of fiber coupler before welding stretches shown in Figure 1 twines state;
Shown in Figure 3 is the wavelength of fiber coupler shown in Figure 1 and the chart of the relation of inserting loss;
Shown in Figure 4 is planimetric map and the outboard profile that the summary of optical fiber maintaining body in the fiber coupler manufacturing apparatus of the present invention's the 1st embodiment and heating arrangements constitutes;
Shown in Figure 5 is the preceding stereographic map that reaches the summary when twining of winding that constitutes the optical fiber rotating mechanism of fiber coupler manufacturing apparatus shown in Figure 4;
Shown in Figure 6 is the chart of the right relation of the optocoupler of the welding stretching time of optically-coupled portion of fiber coupler shown in Figure 1 and each optical fiber;
Shown in Figure 7 is the stereographic map of the summary formation of fiber coupler around optically-coupled portion of other embodiments of the present invention.
Shown in Figure 8 is the outboard profile that the optical fiber of fiber coupler shown in Figure 7 before welding stretches twines state.
Shown in Figure 9 is the sectional view of optically-coupled portion before adding hot-stretch of fiber coupler shown in Figure 7;
Shown in Figure 10 is the wavelength and the graph of a relation that inserts loss of fiber coupler shown in Figure 7.
Embodiment
Below, just be used to implement preferred implementation of the present invention and describe.
Shown in Figure 1 is the stereographic map of 2a around the optically-coupled portion of fiber coupler of the 1st embodiment of the present invention.
This fiber coupler is in order to will transmit light tension type 1 * 2 broadband optical fiber coupler of welding of branch in addition between optical fiber 1a and optical fiber 1b.Article two, optical fiber 1a, 1b are the standard form of selling on the market and identical single-mode fiber.Article two, the external diameter of optical fiber 1a, 1b and guided wave road parameter are identical, all do not have they are carried out prestretched and etching etc. in order to import anisotropic pre-service.Each optical fiber 1a, 1b for example are the flashlights of a plurality of wavelength such as transmission wavelength 1.31um and 1.55um, carry out the wavelength multichannel communication multiple telecommunication.
This fiber coupler has and is used between optical fiber 1a and optical fiber 1b, transmission light is carried out the optically-coupled portion 21 of branch.As shown in Figure 2, to be parts of making optical fiber 1b be wrapped in the linear pattern or the optical fiber 1a of type configuration linearly roughly with S shape in optically-coupled portion 21, and in this case in addition welding stretch and constitute.Therefore, optical fiber 1a, the 1b in optically-coupled portion 21 has different length.Optical fiber 1b is wrapped in the twining amount on the optical fiber 1a, is adjusted to two optical fiber 1a, the 1b length difference in optically-coupled portion 21, and in employed specific 2 wavelength 1.31um of wavelength multichannel communication multiple telecommunication and 1.55um, the transmission optocoupler of each optical fiber 1a, 1b is about equally right.
Figure 3 shows that the wavelength characteristic of fiber coupler, the transverse axis representation signal light wavelength [um] of this figure, the insertion loss [Db] on vertical axis represent signal road.The output wavelength characteristic of optical fiber 1a when family curve A represents by optical fiber 1a input optical signal, family curve B represents the output wavelength characteristic of optical fiber 1b.As shown in Figure 2, fiber coupler is about 50: 50 in the branching ratio of wavelength 1.31um and 1.55um two wavelength under the situation of inserting the about 3dB of loss, possessed the branch's characteristics such as broadband that can use at above-mentioned two wavelength.This branching ratio, can rely on and change the twining amount that optical fiber 1b is wrapped in optical fiber 1a, controlled with high finished product rate, even beyond the reciprocity branch optical fiber coupling mechanism, for example, two wavelength, the branching ratio that is used in wavelength 1.31um and 1.55um is 95: 51 * 2 when not waiting branch's fiber coupler (5% tap coupling mechanism), also can make it easily.
Then, the fiber coupler manufacturing apparatus that is used for making this fiber coupler is described.
Shown in Fig. 4 (a) and (b) the optical fiber maintaining body of fiber coupler manufacturing apparatus and the planimetric map and the outboard profile of heating arrangements 3.
The optical fiber maintaining body of fiber coupler manufacturing apparatus and heating arrangements 3 have a pair of stretching microscope carrier 4a, 4b, between this is to stretching microscope carrier 4a, 4b, are provided with the blowtorch microscope carrier 6 that loads little blowtorch 5.Little blowtorch 5 can rely on blowtorch microscope carrier 6 to move between stretching microscope carrier 4a, 4b, is used for the optically-coupled portion 21 of optical fiber 1a, 1b is heated.Stretching microscope carrier 4a, 4b can move freely on set rectilinear orbit, the optical fiber 1a, the 1b that stretch and be heated fusion.Stretching microscope carrier 4a, 4b have constituted the heating drawing mechanism together with little blowtorch 5, make optical fiber 1a and the optical fiber 1b that is wrapped on the optical fiber 1a form optically-coupled portion 21 by the welding stretching.
In addition, end on stretching microscope carrier 4a is provided with fiber clamp 7, is used for controlling the end of optical fiber 1a, 1b, on two stretching microscope carrier 4a, 4b, be provided with optical fiber holder 8a, 8b and be used for making optical fiber 1b to be wrapped in optical fiber rotating mechanism 9a, 9b on the optical fiber 1a.On stretching microscope carrier 4b, be provided with fiber guides device 10a, 10b.Fiber guides device 10a, 10b go up and can make each optical fiber 1a, 1b rotation roller freely to be constituted by being configured in stretching microscope carrier 4b.In addition,, be provided with fiber support cylinder 11a, 11b with fiber guides device 10a, 10b collocation, on optical fiber 1a, the 1b that is supported by fiber support cylinder 11a, 11b, be fixed with hammer 12a, 12b respectively in the right side of stretching microscope carrier 4b.
In the present embodiment, the weight of hammer 12a is 30g, and the weight of hammer 12b is 25g.Hammer 12a, 12b constitute the mechanism that tension force is provided together with above-mentioned fiber clamp 7, and it offers and is configured to linearity or the tension force of the optical fiber 1a of linearity roughly, is greater than and offers the tension force that is wrapped in the optical fiber 1b on this optical fiber 1a.
The tension force that hammer 12a, 12b produce is passed to optical fiber 1a, the 1b that is positioned at the left side smoothly by fiber clamp 7.Fiber support cylinder 11a, 11b are made of pulley, when the tension direction of hammer 12a, 12b changes, tension force can be passed to optical fiber 1a, 1b smoothly, and can avoid optical fiber 1a, 1b that overbend takes place, fiber clamp 7, fiber guides device 10a, 10b and fiber support cylinder 11a, 11b constitute arrange agencie together, are used for optical fiber 1a, a 1b to be arranged in each other on stretching microscope carrier 4a, the 4b.
Optical fiber rotating mechanism 9a, be located at the substantial middle portion of stretching microscope carrier 4a, optical fiber rotating mechanism 9b is located at the substantial middle portion of stretching microscope carrier 4b.The structure of these optical fiber rotating mechanisms 9a, 9b comprises a pair of matrix 91 respectively, remains on pair of cylindrical rotary body 92 on each matrix 91 freely with rotation shown in Fig. 5 (a) and (b).Each rotary body 92 that is configured face-to-face is to be driven by the rotary drive mechanism that does not show on figure, each other rotation inversely.As shown in the figure, the formation of rotary body 92 is in the axle center consistent location of following as the spinning movement center, formation is used for for the interspersed benchmark inserting hole 93 of optical fiber 1a, and certain distance forms being used for for the interspersed rotation inserting hole 94 of optical fiber 1b along the axle center opening in the abaxial.
Above-mentioned optical fiber holder 8a, 8b are configured to other optical fiber 1b is wrapped in optical fiber 1a winding mechanism on every side with optical fiber rotating mechanism 9a, 9b.
Then, just used the manufacture method of the fiber coupler of this manufacturing installation to describe.
At first, remove the optical fiber 1a as optical fiber coupling part 21, the coat of 1b, and this part is configured in the middle position of stretching microscope carrier 4a, 4b, in this case, control the end of optical fiber 1a, 1b with fiber clamp 7.Then, shown in Fig. 5 (a), an optical fiber 1a intert is constituted the benchmark inserting hole 93 of the rotary body 92 of optical fiber rotating mechanism 9a, 9b, and rotation inserting hole 94 that will the interspersed rotary body 92 of an other optical fiber 1b.And lean on fiber guides device 10a, 10b and fiber support cylinder 11a, 11b that optical fiber 1a, 1b are supported on stretching microscope carrier 4a, the 4b.By like this, as shown in Figure 4, two optical fiber 1a, 1b are arranged on stretching microscope carrier 4a, the 4b.At this moment, optical fiber holder 8a, 8b keep open, and purpose is that the tension force that transmits from hammer 12a, 12b can be applied on optical fiber 1a, the 1b that is positioned at the right side by fiber clamp 7.
Afterwards, hammer 12a, 12b are installed in the other end of each optical fiber 1a, 1b respectively.After hammer 12a, 12b are installed,, will pass to optical fiber 1a, 1b smoothly by the tension force that hammer 12a, 12b produce, for each optical fiber 1a, 1b provide opposite tension force by constituting each roller of fiber guides device 10a, 10b and fiber support cylinder 11a, 11b.
In this state, the rotary body 92 that makes two optical fiber rotating mechanism 9a, 9b is approximately simultaneously toward the reverse directions rotation or only make wherein that a side rotates.The optical fiber 1a of the benchmark inserting hole 93 of interspersed rotary body 92 is because be located at the center of the turning axle of rotary body 92, even under the situation of rotary body 92 rotations, also can not revolve round the sun.On the other hand, intert the optical fiber 1b of rotation inserting hole 94, can be along with the spinning movement of rotary body 92, be the center rotation with the axle of rotary body 92.Along with this rotation, shown in Fig. 5 (b), the position that is removed coat of the optical fiber 1b of the optically-coupled portion 21 between two optical fiber rotating mechanism 9a, 9b is wrapped in and is configured to linearity or the position that is removed coat of the optical fiber 1b of the optically-coupled portion 21 of linearity roughly.At this moment, be added in the tension force of optical fiber 1a, be greater than the tension force that is added in optical fiber 1b, so can not cause the bending of optical fiber 1a because of the revolution of optical fiber 1b.
In the present embodiment, make the rotary body 92 of optical fiber rotating mechanism 9b approximately rotate 260 degree.The numerical value of this rotation amount is to try to achieve according to the maximum degree of coupling of the transmission light of optical fiber 1a, 1b and the relation of rotation angle.Yet, this numerical value is relative value, depending primarily on the structure (structure of optical fiber rotating mechanism and installation site, blowtorch structure etc.), manufacturing conditions (offering tension force size, welding degree, tension shape of optical fiber etc.) of optical fiber kind, manufacturing installation, is not an absolute value.In addition, in the present embodiment, only make optical fiber rotating mechanism 9b rotation, but when rotation amount is big, also can make both sides' reverse rotation of optical fiber rotating mechanism 9a, 9b.
Then, control and maintain each optical fiber 1a, 1b with optical fiber holder 8a, 8b, after little blowtorch 5 igniting, with blowtorch microscope carrier 6 little blowtorch 5 is moved to preposition, after making its welding for the position heating that is removed coat of optically-coupled portion 21, stretching microscope carrier 4a, 4b are slowly stretched to the left and right, continue heating on one side, stop to add hot-stretch in set place and form optically-coupled portion 21.Then, the both sides of optically-coupled portion 21 are fixed on substrate after, its integral body is removed from manufacturing installation, encapsulate, and finish the making of photo-coupler.
Shown in Figure 6 is the input wavelength of heating stretching time (representing with transverse axis) and the optical fiber 1a of optical fiber 1a, 1b when being the flashlight of 1.31um and 1.55um, the graph of a relation of optocoupler separately right (representing with the longitudinal axis).In the present embodiment, be when the right arrival at first of the optocoupler of two wavelength consistent (the A point among the figure), stop to add hot-stretch.Therefore, through the above-mentioned welding formed optically-coupled portion 21 that stretches, wherein the length difference to two optical fiber 1a, 1b is configured in employed two specific wavelength 1.31um of wavelength multichannel communication multiple telecommunication and 1.55um the right minimum length that reaches about equally of the transmission optocoupler of each optical fiber 1a, 1b.
Fiber coupler according to above-described present embodiment, optical fiber 1b is wrapped in be configured to the linearity or the optical fiber 1a of linearity roughly, only rely on each optical fiber 1a, 1b length difference, just can make between each optical fiber 1a, 1b of optically-coupled portion 21 to have asymmetry in optically-coupled portion 21.
Therefore, must not resemble the pre-service that the transmission that is used for making same fibre the traditional method in advance exactly has difference, just can import asymmetry.Because asymmetry is controlled in the length of optically-coupled portion 21 by each optical fiber 1a, 1b, therefore can when stretching, the welding of optically-coupled portion 21 be revised again at each optical fiber 1a, 1b.Thereby and in pre-service amount sensitivity, the traditional fiber coupler that can't revise transmission when welding stretches are compared, the fiber coupler of present embodiment has the effect that improves yield rate.
In addition, according to the fiber coupler of present embodiment, must not prepare out to control scrupulously the different fiber of each characteristic, so help considering of cost face as conventional practice.In addition, owing to must strictly not possess each parameter in the direction of optical fiber 1a, 1b, thereby the characteristic of fiber coupler can deterioration when producing, and can not cause the reduction of yield rate.
In addition,, control each optical fiber 1a, 1b length difference in optically-coupled portion 21 by changing the twining amount of optical fiber 1b to optical fiber 1a, prepared fiber coupler, be not limited in 50: 50 etc. branching ratio, and can obtain branching ratio arbitrarily.Be not only 1 * 2 the fiber coupler that does not wait branch, 1 general * N does not wait the fiber coupler of branch can be made of the same manner yet.Moreover,, also can not use the broadband of N+1 bar optical fiber, the problem that the wavelength interdependence of generation extra loss increases on principle as tradition for obtaining branch's fiber couplers such as 1 * N is wide band.Can obtain 1 * N broadband optical fiber coupler with few 1 N bar optical fiber.In addition, can be for fear of this problem yet, and such as to 1 * N broadband, etc. branch's fiber coupler to import asymmetry with asymmetric tapering such, the shape control in asymmetric tapering becomes problem, and becomes the situation of the essential factor that yield rate reduces.
In addition, the fiber coupler of present embodiment, can will not increase size and realize the broadband of branching ratio as using asymmetric tapering to import the situation of asymmetry at the fine coupling mechanism of the wide band five equilibrium luminous intensity distribution of 1 * N, also being unlikely becomes the reason that causes yield rate to reduce.Therefore, must not make the tapering than actual required also long, just can obtain branching ratio is wide band fiber coupler.
In addition, though present embodiment is to be described by the situation that same fibre 1a, 1b constitute with regard to fiber coupler, its formation needn't adopt same fibre can not, promptly also can use different fiber to constitute fiber coupler.That is to say no matter use same fibre 1a, 1b or use different fiber, rely on to make the length difference of each optical fiber, like this, promptly need not possess difference, and can easily asymmetry be imported optical fiber coupling part 21 in each optical fiber chien shih transmission in optically-coupled portion 21.Therefore, even use different fiber, also can make branching ratio easily is wide band above-mentioned fiber coupler.
In addition, the manufacture method of the fiber coupler of present embodiment, as previously mentioned, make in the alignment process that optical fiber 1a, 1b arrange each other, comprise and 1 optical fiber 1a is configured to linearity or roughly behind the linearity, around it, twine another root optical fiber 1b identical, and make each optical fiber 1a, 1b in the different coiling operation of the length of optically-coupled portion 21 with this optical fiber 1a.Therefore, be installed in the weight of hammer 12a, 12b on optical fiber 1a, the 1b or constitute the rotation amount of the rotary body 92 of optical fiber rotating mechanism 9a, 9b, change the twining amount of optical fiber 1b, just can adjust each optical fiber 1a, 1b length difference in optically-coupled portion 21 to optical fiber 1a by adjustment.Therefore,, just can control the asymmetry between each optical fiber 1a, 1b, make the fiber coupler that branching ratio is desirable broadband character easily by changing the twining amount of optical fiber 1b to optical fiber 1a.
In addition, the manufacture method of the fiber coupler of present embodiment, as previously mentioned, in the winding working procedure, to linearity or the tension force that provided of the optical fiber 1a of linearity roughly are provided, the tension force that is provided greater than the optical fiber 1b that is wrapped in this optical fiber 1a, therefore, can utilize the tension force that is provided the bigger optical fiber 1a of tension force, around this optical fiber 1a, twine the optical fiber 1b that is provided than small tension receiving coil, rely on this, optical fiber 1a can be not crooked because of bearing the stress that is wrapped in its optical fiber 1b on every side.Therefore, with optical fiber 1b be wrapped in optical fiber 1a around the time, can prevent from can not be maintained quantitatively because of the optical fiber 1a twining amount that causes optical fiber 1b that bends.Just, optical fiber 1b can keep constant to the twining amount of optical fiber 1a, the winding state that can realize having repeatability.Therefore, can make the complete fiber coupler of broadband character of branching ratio easily, improve yield rate.
The manufacturing installation of the fiber coupler of present embodiment, as previously mentioned, possess: the optical fiber 1b identical with optical fiber 1a is wrapped in is configured to linearity or the winding mechanism around the optical fiber 1a of linearity roughly, and make the tension force of the tension force that the tension force that offers optical fiber 1a provided greater than the optical fiber 1b that is wrapped in this optical fiber 1a that mechanism is provided.Therefore, when by winding mechanism optical fiber 1b is wrapped in optical fiber 1a around when, rely on tension force to provide mechanism to provide prescribed tension to each optical fiber 1a, 1b, optical fiber 1a promptly can be not crooked because of bearing the strength that is wrapped in its optical fiber 1b on every side, and optical fiber 1b can keep certain to the twining amount of optical fiber 1a.Therefore, the fiber coupler manufacturing apparatus that is provided can be controlled the asymmetry between optical fiber 1a, 1b in the optically-coupled portion 21 easily by the length difference of optical fiber 1a, 1b.
The 2nd embodiment of fiber coupler of the present invention then, is described.
Shown in Figure 7 is the stereographic map of 2b around the optically-coupled portion of tension type 1 * 4 broadband optical fiber coupler of welding of present embodiment.
2b around the optically-coupled portion of fiber coupler, be optical fiber 1a with the linearity that is positioned at the center as the dual-purpose optical fiber of input and output, other optical fiber 1b, 1c, the 1d that is wrapped in optical fiber 1a with spirality then is the optical fiber as the output special use.The same with the 1st embodiment, each optical fiber 1a～1d also is the standard form of selling on the market and identical single-mode fiber.In the 2nd embodiment, can use different fiber to constitute fiber coupler similarly.The optically-coupled portion 22 of fiber coupler, it constitutes as shown in Figure 8, is that a part at other 3 optical fiber 1b, 1c, 1d is wrapped in linearity or roughly under the state of the optical fiber 1a of linearity configuration, and in addition welding stretches and forms.Therefore, differ from one another at the optical fiber 1a of optically-coupled portion 22 and the length of other optical fiber 1b～1d.Optical fiber 1b, 1c, 1d are to the twining amount of optical fiber 1a, be to be adjusted at the optical fiber 1a of optically-coupled portion 22 and the length difference of other optical fiber 1b～1d, in employed two specific wavelength 1.31um of wavelength multichannel communication multiple telecommunication and 1.55um, the right length about equally of the transmission optocoupler of each optical fiber 1a, 1b, 1c, 1d.
The manufacturing installation of this fiber coupler, though it is identical substantially with the formation of the fiber coupler manufacturing apparatus of the 1st embodiment, but in optical fiber rotating mechanism 9a, 9b, except that opening the benchmark inserting hole 93 of rotation center, also be provided with 3 rotation inserting holes 94 that are symmetrical in rotation center, and become the formation of in amounting to 4 holes, inserting optical fiber 1a, 1b, 1c, 1d respectively.As the mechanism of tension force being provided for optical fiber 1a～1d, be to possess 4 mechanisms independent of each other (fiber guides device 10a～10d, fiber support cylinder 11a～11d), 3 hammer 12b～12d are arranged outside hammer 12a in addition, be installed in the end of each optical fiber 1a, 1b, 1c, 1d respectively.At this moment, the weight that is applied to the hammer 12a of optical fiber 1a for example is about 35g, and the weight that is applied to hammer 12b～12d of other optical fiber 1b～1d then is about 20g respectively.As previously mentioned, bigger than the tension force that offers other 3 optical fiber 1b, 1c, 1d owing to offer the tension force of optical fiber 1a, so present embodiment, also can ensure the rectilinearity of optical fiber 1a with high finished product rate.
Provide such tension force on one side, Yi Bian as shown in Figure 8, optical fiber 1b, 1c, 1d are wrapped on the optical fiber 1a twist.Present embodiment, be make rotating mechanism 9a, 9b each other each retrograde rotation 270 degree twine.This rotation amount is identical with the 1st embodiment, is the relation according to the rotation angle and the maximum degree of coupling, makes the length difference of each optical fiber 1a, 1b, 1c, 1d, can reach the right value about equally of transmission optocoupler of each optical fiber 1a, 1b, 1c, 1d.This numerical value is the relative value of the structure that depends primarily on optical fiber kind, manufacturing installation, manufacturing conditions etc. too, is not to be absolute value, so suitable change can not constitute obstacle yet.The optimum value of rotation angle is the value that depends primarily on branches, and for example, if when 1 * 8 fiber coupler, its rotating condition ought to be different fully.The rotation amount of optical fiber rotating mechanism needn't equate can not, also can only make rotating mechanism 9a or rotating mechanism 9b the rotation.
Shown in Figure 9 is the cross-sectional configuration of the optically-coupled portion of fiber coupler.
Among this figure, the position configuration of output special optic fibre 1b, 1c, 1d is in the position with respect to the dual-purpose optical fiber 1a symmetry of output input, yet, give all optical fiber 1a, 1b, 1c, when 1d provides certain force of strain, the trace skew of the relative position between this output special optic fibre 1b, 1c, 1d will be the crooked main cause of coiling (coiling of S shape) of optical fiber 1a that causes being positioned at the center.Therefore, in this case,, want to obtain the wideband branching characteristic with high finished product rate, and be not easy by the asymmetry of optically-coupled portion 22 with the asymmetry of the structure in the not easy-to-use good precision control optically-coupled portion 22.
With respect to this point, in the present embodiment, offer the tension force of optical fiber 1a, greater than the tension force that offers other optical fiber 1b, 1c, 1d, so can not cause the bending of optical fiber 1a because of the revolution of optical fiber 1b, 1c, 1d.Thus, as the method for twining optical fiber 1b, 1c, 1d, to many optical fiber 1a, 1b, 1c, different hammer 12a, 12b, 12c, the 12d of 1d impost, utilize the tension force of the optical fiber 1a of having heavier hammer 12a to come twisted fiber 1b, 1c, 1d, whereby, just can make with lighter hammer 12b, 12c, optical fiber 1b, the 1c of 12d, 1d and be wrapped in around the optical fiber 1a of heavier hammer 12a.By means of the winding method that has utilized this principle, the winding state with repeatability just can be realized easily, and can reproduce branching ratio easily.So, be positioned at the tension force that the optical fiber 1a at center is provided, just make the twining amount of optical fiber 1b, 1c, 1d keep certain by increasing, yield rate improve and repeatability splendid.
The cross-sectional configuration of the optically-coupled portion of fiber coupler shown in Figure 9, the rely on asymmetric tapering disclosed with patent documentation 7 reaches 1 * 4 broadband fiber coupler, has similar formation (with reference to Fig. 1 of the document).Yet as the records of 61～63 row on 55～57 row on the 4th hurdle of the document or the 7th hurdle, identical to 4 tension force that optical fiber applied, therefore, although clearly record in the document, the optical fiber at center is very big in the possibility that length direction bends.Just, the optical fiber 1a at center wants to keep the probability of linearity shown in Figure 8 to decline to a great extent.Therefore, in this case, can not guarantee the asymmetry between optical fiber 1a and the optical fiber 1b～1d.Therefore, the fiber coupler of the document is to import the broadband that asymmetry is guaranteed characteristic in the tapering.Optical fiber rotating mechanism shown in the document, its effect only is that 4 optical fiber are in contact with one another, and from the document, and can't find out providing differential tension to import the intention of asymmetry between optical fiber.
Shown in Figure 10 is that the transverse axis of this figure is represented signal light wavelength [um] with the wavelength characteristic figure of the fiber coupler after the also process encapsulation of present embodiment made, and the longitudinal axis is then represented the insertion loss [dB] of signal path.Family curve A represents the output wavelength characteristic of optical fiber 1a, and family curve B, C, D represent the output wavelength characteristic of optical fiber 1b, 1c, 1d.As shown in the drawing, fiber coupler 2b is in the branching ratio of wavelength 1.31um and 1.55um two wavelength, branch such as is roughly under the situation of inserting the about 6dB of loss, has the branch's characteristic such as wide band that can use under these two kinds of wavelength.This branching ratio can be controlled with high finished product rate by changing the twining amount of optical fiber 1b～1d to optical fiber 1a, wants 1 * 4 of branching ratio not wait branch's fiber coupler and can make easily.
Thereby, fiber coupler according to present embodiment, needn't be as the tension type fiber coupler of traditional welding, carry out for pre-service such as the prestretched that imports asymmetry, etchings, also needn't use the optical fiber of a plurality of kinds, can when forming optically-coupled portion 22, import asymmetrical configuration with 4 identical optical fiber 1a, 1b, 1c, 1d, obtain branch's characteristics such as wide band thus.
Prepared like this fiber coupler, such as mentioned above, just obtain under wavelength 1.31um and 1.55um two wavelength branch's characteristics such as available broadband, but the high finished product rate ground control branching ratio just of the twining amount by changing optical fiber 1b.
In addition, in the respective embodiments described above, be to use hammer 12a～12d that load-carrying is imposed on optical fiber 1a～1d, but also can utilize other such as spring force, magnetic force etc.Though this example as heating source, also can be used other heating means with little blowtorch 5, for example uses electric heater, discharge, the CO of pottery etc.
2Methods such as laser heat.
Utilizability on the industry
Though in the above-mentioned embodiment, the situation that fiber coupler of the present invention is applied in 1 * 2 fiber coupler and 1 * 4 fiber coupler has been described, but the present invention also can be applied in for example other general 1 * N fiber couplers such as 1 * 3 fiber coupler, 1 * 8 fiber coupler.The present invention is being applied under the situation of such fiber coupler, also can obtaining the effect same with above-mentioned embodiment.
Claims (6)
1. a fiber coupler has the optically-coupled portion that the transmission that makes an optical fiber is optically coupled to other one or more optical fiber, it is characterized in that:
An above-mentioned optical fiber and above-mentioned other one or more optical fiber, the identical optical fiber of pre-service, transmission that is changed by the transmission that does not all make in arbitrary optical fiber each other constitutes, an above-mentioned optical fiber and above-mentioned other one or more optical fiber differ from one another in the length of above-mentioned optically-coupled portion, and the length of this optically-coupled portion is the degree of coupling minimum length about equally of the transmission light that makes above-mentioned each optical fiber at least two specific wavelengths.
2. fiber coupler according to claim 1 is characterized in that:
In above-mentioned optically-coupled portion, an above-mentioned optical fiber is configured to linearity or linearity roughly, and above-mentioned other one or more optical fiber coil with respect to an above-mentioned optical fiber S shape.
3. fiber coupler according to claim 1 is characterized in that:
In above-mentioned optically-coupled portion, above-mentioned other one or more optical fiber are configured to linearity or linearity roughly, and an above-mentioned optical fiber is with respect to above-mentioned other one or more optical fiber S shapes coilings.
4. the manufacture method of a fiber coupler comprises the alignment process that many optical fiber are arranged each other; With the welding in addition of above-mentioned each optical fiber that will in this alignment process, be arranged, stretching and form the welding stretching process of optically-coupled portion, it is characterized in that:
Above-mentioned many optical fiber, the identical optical fiber of pre-service, transmission that is changed by the transmission that does not all make in arbitrary optical fiber each other constitutes;
Above-mentioned alignment process comprises winding working procedure, its in above-mentioned optically-coupled portion, at least one fiber configuration is in line shape or linearity roughly, and around it, twine other optical fiber of one or more.
5. the manufacture method of fiber coupler according to claim 4 is characterized in that:
In above-mentioned winding working procedure, all provide tension force to above-mentioned many optical fiber, and to being configured to the linearity or the tension force that above-mentioned optical fiber provided of linearity roughly, greater than to being wrapped in the tension force that other optical fiber provided on this optical fiber.
6. a fiber coupler manufacturing apparatus comprises the arrange agencie that many optical fiber are arranged each other; With above-mentioned each optical fiber welding in addition that will arrange with this arrange agencie, stretching and form the welding drawing mechanism of optical fiber coupling part, it is characterized in that possessing:
Winding mechanism is being configured to linearity or is roughly twining other optical fiber of one or more around at least one optical fiber of linearity;
Tension force provides mechanism, all provides tension force to above-mentioned many optical fiber, and to be configured to linearity or roughly the tension force that above-mentioned optical fiber provided of linearity be retained as greater than to being wrapped in the tension force that other optical fiber provided on this optical fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003409729A JP3974106B2 (en) | 2003-12-09 | 2003-12-09 | Broadband optical fiber coupler, manufacturing method thereof, and manufacturing apparatus thereof |
| JP409729/2003 | 2003-12-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1890589A CN1890589A (en) | 2007-01-03 |
| CN100392451C true CN100392451C (en) | 2008-06-04 |
Family
ID=34674906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800365109A Expired - Fee Related CN100392451C (en) | 2003-12-09 | 2004-11-18 | Optical fiber coupler and process and device for producing the same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3974106B2 (en) |
| CN (1) | CN100392451C (en) |
| TW (1) | TW200527020A (en) |
| WO (1) | WO2005057260A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5205004B2 (en) * | 2007-07-27 | 2013-06-05 | 富士フイルム株式会社 | Fabrication method of optical fiber bundle and optical fiber type combiner module |
| JP6182521B2 (en) * | 2013-12-05 | 2017-08-16 | 古河電気工業株式会社 | Optical fiber laser equipment |
| CN109655973B (en) * | 2019-01-07 | 2024-02-20 | 浙江大学 | 2 x 2 single-mode fiber directional coupler with continuously adjustable light splitting ratio |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5058979A (en) * | 1989-06-22 | 1991-10-22 | Fujikura Ltd. | Optical fiber coupler and a fabrication method for the same |
| US5069518A (en) * | 1989-07-31 | 1991-12-03 | Japan Aviation Electronics Industry Limited | Method of fabricating a fiber optic coupler |
| JPH0777623A (en) * | 1993-06-30 | 1995-03-20 | Shin Etsu Chem Co Ltd | Production of optical fiber coupler |
| JPH07181340A (en) * | 1993-12-24 | 1995-07-21 | Shin Etsu Chem Co Ltd | Manufacture of wide band optical fiber coupler |
| US5764830A (en) * | 1996-11-13 | 1998-06-09 | E-Tek Dynamics, Inc. | 1×N and N×N fiber optic couplers |
-
2003
- 2003-12-09 JP JP2003409729A patent/JP3974106B2/en not_active Expired - Fee Related
-
2004
- 2004-11-18 WO PCT/JP2004/017148 patent/WO2005057260A1/en active Application Filing
- 2004-11-18 CN CNB2004800365109A patent/CN100392451C/en not_active Expired - Fee Related
- 2004-11-24 TW TW93136088A patent/TW200527020A/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5058979A (en) * | 1989-06-22 | 1991-10-22 | Fujikura Ltd. | Optical fiber coupler and a fabrication method for the same |
| US5069518A (en) * | 1989-07-31 | 1991-12-03 | Japan Aviation Electronics Industry Limited | Method of fabricating a fiber optic coupler |
| JPH0777623A (en) * | 1993-06-30 | 1995-03-20 | Shin Etsu Chem Co Ltd | Production of optical fiber coupler |
| JPH07181340A (en) * | 1993-12-24 | 1995-07-21 | Shin Etsu Chem Co Ltd | Manufacture of wide band optical fiber coupler |
| US5764830A (en) * | 1996-11-13 | 1998-06-09 | E-Tek Dynamics, Inc. | 1×N and N×N fiber optic couplers |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3974106B2 (en) | 2007-09-12 |
| JP2005172972A (en) | 2005-06-30 |
| CN1890589A (en) | 2007-01-03 |
| WO2005057260A1 (en) | 2005-06-23 |
| TW200527020A (en) | 2005-08-16 |
| TWI344556B (en) | 2011-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6990278B2 (en) | Mode multiplexing optical coupling device | |
| JPS63108311A (en) | Manufacture of single mode evanescent wave photocoupler | |
| CN1359474A (en) | Multicore and multimode dispersion managed fibers | |
| EP0749025B1 (en) | Process for producing an optical fiber coupler | |
| CN102213790B (en) | Be convenient to panda type polarization-preserving fiber and the manufacture method thereof of coiling | |
| EP0532698A1 (en) | Fiber optic power splitter | |
| CN100392451C (en) | Optical fiber coupler and process and device for producing the same | |
| CA1299411C (en) | Asymmetric fibre optic couplers and their fabrication | |
| US6363190B1 (en) | Polarization insensitive fused fiber coupler method and apparatus | |
| US6731842B2 (en) | Microbend fused fiber coupler method and apparatus | |
| CN202141828U (en) | Panda type polarization maintaining fiber easy for winding | |
| CN109655973B (en) | 2 x 2 single-mode fiber directional coupler with continuously adjustable light splitting ratio | |
| CA2190044C (en) | Broadband coupler | |
| AU742142B2 (en) | 1xN fiber optic coupler/splitter | |
| JPS6165204A (en) | Optical star coupler and its manufacture | |
| CN1172958A (en) | Mach-zehnder interferometric devices with composite fibers | |
| JP2879367B2 (en) | Optical branching coupler and method of manufacturing the same | |
| JPH0467106A (en) | Optical fiber parameter converting and connecting element and production thereof | |
| JP3101958B2 (en) | Broadband coupler and method of manufacturing the same | |
| JP2879266B2 (en) | Broadband optical fiber coupler | |
| JPS60189706A (en) | Branching device for multicore optical fiber | |
| JP2958179B2 (en) | Optical fiber coupler and manufacturing method thereof | |
| JPH07181340A (en) | Manufacture of wide band optical fiber coupler | |
| JPH0667057A (en) | Optical fiber coupler maintaining plane of polarization | |
| JPH11337763A (en) | Polarization maintaining optical fiber aligning device and manufacturing equipment of polarization maintaining optical fiber coupler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080604 Termination date: 20171118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |