CN1697990A - Coated optical fiber and coated optical fiber with connector - Google Patents
Coated optical fiber and coated optical fiber with connector Download PDFInfo
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- CN1697990A CN1697990A CN 200480000527 CN200480000527A CN1697990A CN 1697990 A CN1697990 A CN 1697990A CN 200480000527 CN200480000527 CN 200480000527 CN 200480000527 A CN200480000527 A CN 200480000527A CN 1697990 A CN1697990 A CN 1697990A
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
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Abstract
An object of the present invention is to provide a buffered optical fiber, which excels in environmental characteristics and mechanical characteristics and has high flame retardancy and excels in optical transmission characteristics, and to provide a buffered optical fiber, which is terminated with a connector and uses this buffered optical fiber. The buffered optical fiber of the invention is provided with a second coating layer on an outer peripheral surface of an optical fiber produced by providing a first coating layer on an outer peripheral surface of a glass fiber. A second resin composition constituting the second coating layer comprises 100 to 250 weight parts of metal hydroxide and 10 to 100 weight parts of a nitrogen-based flame retardant material per 100 weight parts of the base polymer. Further, the second resin composition does not contain halogenated materials.
Description
＜technical field 〉
The present invention relates to clad optical fiber and connector mounted clad optical fiber.
＜background technology 〉
By containing silica glass as its key component with have to apply on the neighboring of glass fibre of external diameter of 125 μ m and film as the thermosetting silicon resin of first coat, the external diameter of such first coat becomes 400 μ m, on the neighboring of first coat, apply polyamide thermoplastic resin then, produce clad optical fiber as second coat.This clad optical fiber has been used for optics rope or analog (prior art 1: referring to patent documentation 1).
By the way, this optics rope is usually through configuration design, makes the pulling strengrth line be configured in fibre-optic periphery and is provided at the periphery of optical fiber and pulling strengrth line by the cortex that Polyvinylchloride or analog are made.This optics rope is used for the wiring of optical communication device etc.
Simultaneously, in recent years,, when rope and cable are burned, require not worry to produce harmful gas such as hydrogen chloride gas according to the requirement that reduces carrying capacity of environment.
By forming twisted pair wire and then this twisted pair wire be made insulator core pair twist that bundle obtains and the paired cable of unscreened and twisting by applying whole foreskin manufacturing thereon is known as the cable that does not produce harmful gas and have anti-flammability with the insulator insulated conductor.In this cable, fire retardant is added in the outside surface at least of insulator and whole foreskin.Phosphorus compound, hydrated metal compound and metal-oxide compound are exemplified as fire retardant (prior art 2: referring to patent documentation 2).
Patent documentation 1:JP-A-62-99708.
Patent documentation 2:JP-A-8-138454.
Yet, even according to prior art, the clad optical fiber that does not have acquisition that environment is had less load and has anti-flammability.
＜of the present invention open
The invention solves the problems referred to above.The purpose of this invention is to provide has less load and has anti-flammability and the clad optical fiber of the light-transfer characteristic of excellence environment.
Provide second coat on the fibre-optic external peripheral surface that will provide first coat to produce on by external peripheral surface according to clad optical fiber of the present invention at glass fibre.Second resin combination that constitutes second coat contains the metal hydroxides of base resin and 100-250 weight portion and the nitrogen type flame retardant of 10-100 weight portion, this base resin of per 100 weight portions.In addition, second resin combination does not contain halogen.
More preferably, this base resin is to be made of amorphous resin.
More preferably, second resin combination contains, as this base resin, be selected from following a kind of component: the one matter of polystyrene type resin, the elastomeric one matter of polystyrene type, the potpourri of polystyrene type resin and polyphenylene oxide, and the potpourri of polystyrene type elastic body and polyphenylene oxide.
More preferably, this polystyrene type resin or the elastomeric part of this polystyrene type are carried out sour modification.
More preferably, second coat is to be formed by two or more coats.
More preferably, clad optical fiber is equal to or less than 0.2dB/km in the textural amount (dB/km) that requires following defined loss to change:
The amount that loss changes: the quantity variance between variation of the maximum loss on the loss amount and lowest loss variation that produces in exposure test heat cycle is (by dB/km, under 1.55 mum wavelengths and just comprise the loss amount that after on-test, produces), this test remain under (40) ℃ 0.5 hour by temperature wherein by repetition and wherein temperature remain in and the heat cycle of forming in 0.5 hour under 85 ℃ carry out.
More preferably, the linear expansion coefficient of second resin combination is equal to or less than 4.0 * 10
-4(1/K).
More preferably, be equal to or less than 150 μ m as following defined processing distortion.
Processing distortion: the distance between the end face of the end face of glass fibre and second coat under 120 ℃ temperature in 168 hours the clad optical fiber of thermal treatment.
More preferably, clad optical fiber is the resin bed of ultraviolet-curing through configuration designing requirement first coat, cut off (cut) and do not allow the summit (apex) of the face of cutting off reach glass fibre in direction from second coat to glass fibre, when the resin bed of ultraviolet-curing and second coat separate when extracting glass fibre out from glass fibre, " separating and the ratio of length with the length of second coat that separates of the covering piece middle-ultraviolet lamp curable resin layer of removing " is 15% to 85%.
More preferably, internal layer and skin are to provide as second coat on fibre-optic external peripheral surface on away from fibre-optic direction at these layers one by one.In addition, adjust internal layer, the nitrogen type flame retardant that requires to add the metal hydroxides of 100-250 weight portion therein and be lower than 100 weight portions, the polystyrene type thermoplastic resin of per 100 weight portions, polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials.
More preferably, internal layer and skin are to provide as second coat on fibre-optic external peripheral surface on away from fibre-optic direction at these layers one by one.In addition, adjust skin, the nitrogen type flame retardant that requires to add the metal hydroxides of 100-250 weight portion therein and be lower than 100 weight portions, the polystyrene type thermoplastic resin of per 100 weight portions, polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials.
More preferably, clad optical fiber is extracted the resin bed of ultraviolet-curing out and the power of second coat is equal to or less than 2.5kgf in textural requirement from glass fibre.
In addition, connector mounted clad optical fiber according to the present invention is through adjusting, (it has the part exposure of predetermined length by allowing apart from the end of this glass fibre according to clad optical fiber of the present invention in requirement, therefore the end face that has glass fibre expose portion and coating, carry out configuration design) be connected to the connector of introducing lasso, this lasso has the cavity so that can hold the glass fibre expose portion, with the end face that coats near the butt joint end face of this lasso so that hold the glass fibre expose portion with a kind of state, the glass fibre expose portion in the cavity is not being applied distortion power under this state.
The summary of＜accompanying drawing 〉
Fig. 1 is the schematic cross sectional views according to the clad optical fiber of embodiment of the present invention.
Fig. 2 is the diagrammatic sketch of explanation according to the manufacturing of the clad optical fiber of this embodiment of the present invention.
Fig. 3 (A) is the schematic cross sectional views according to the clad optical fiber of embodiment of the present invention, and Fig. 3 (B) is the fibre-optic schematic cross sectional views according to embodiment of the present invention.
Fig. 4 is the diagrammatic sketch of explanation according to the manufacturing of the clad optical fiber of embodiment of the present invention.
Fig. 5 (A), 5 (B) and 5 (C) are the diagrammatic sketch of removing that has illustrated according to the coat of the clad optical fiber of embodiment of the present invention.
Fig. 6 is the diagrammatic sketch of explanation according to the manufacturing of the connector mounted clad optical fiber of embodiment of the present invention.
Fig. 7 (A) and 7 (B) have shown that the coat of the coat that is used to remove clad optical fiber removes the diagrammatic sketch of instrument.
Fig. 8 is the diagrammatic sketch that has illustrated for the method for the flame retardant test of the clad optical fiber of embodiment.
By the way, among the reference number in the accompanying drawings, reference number 10 and 50 expression clad optical fibers, reference number 11 and 51 expression glass fibre, reference number 12 and 52 expressions, first coat, reference number 13 and 53 expression optical fibers, reference number 54 expression internal layers, reference number 55 expressions are outer, reference number 16 and 56 expressions, second coat, reference character 56A represents to coat end face, reference number 17 expression lassos, and reference character 17A represents the cavity, reference character 17B represents the butt joint end face of lasso, reference character 17C represents the unlimited end face of lasso, reference number 18 expression connectors and the connector mounted clad optical fiber of reference number 19 expressions.
＜implement optimal mode of the present invention 〉
Describe embodiment of the present invention in detail below with reference to accompanying drawing.
As shown in the schematic cross sectional views of Fig. 1, provide second coat 16 on the external peripheral surface of optical fiber 13 according to the clad optical fiber 10 of embodiment of the present invention, wherein first coat 12 is provided on the external peripheral surface of glass fibre 11.
Therefore, the base resin of second resin combination (back is called second resin) is the resin that does not contain halogen.Therefore, second resin has the performance that does not produce toxic gas when burning.
Preferably, second resin is noncrystalline resin.Therefore, clad optical fiber 10 can more steadily and surely form, so that performance is excellent on light-transfer characteristic.
By the way, if second resin is a crystalline resin, then the orientation of material itself can strengthen.Especially when when the optical fiber of resin extruded one-tenth high-speed cruising is made clad optical fiber, second resin is easy to provide the processing distortion for glass fibre when making clad optical fiber.Therefore, clad optical fiber tends to have poor light-transfer characteristic.In this case, in order to reduce the generation of processing distortion, need carry out another kind of technology to optical fiber, as annealing in process.
More preferably, second resin combination contains, as second resin, be selected from following a kind of component: the one matter of polystyrene type resin, the elastomeric one matter of polystyrene type, the potpourri of polystyrene type resin and polyphenylene oxide, and the potpourri of polystyrene type elastic body and polyphenylene oxide.
Preferably, second resin combination contains the polystyrene type thermoplastic resin as second resin.Therefore, especially, the thermotolerance of second coat is enhanced.In addition, the cohesive between employed second resin combination and epoxy type adhesive becomes favourable, when being connected in connector.
By rubber components such as styrene butadiene rubbers can be exemplified as the polystyrene type thermoplastic resin as the high-impact polystyrene (HIPS) that farmland or analog are scattered in the polystyrene to be obtained subtly.Therefore, can stably obtain to have the clad optical fiber of excellent light-transfer characteristic.
In addition, preferably, second resin combination contains polystyrene type elastic body and the polyphenylene oxide as second resin.Therefore, thermotolerance and anti-flammability are enhanced.
Have polystyrene hard segment and diene polymer soft segment such as polybutadiene, in the middle of the segmented copolymer of hydrogenated butadiene polymer and polyisoprene or ethylene-propylene rubber, styrene-butadiene-styrene block copolymer (SBS) with polybutadiene soft segment, styrene-different the eleventh of the twelve Earthly Branches diene-styrene block copolymer (SIS) with different the eleventh of the twelve Earthly Branches diene soft segment, by styrene-(ethene-butylene)-styrene block copolymer (SEBS) that SBS hydrogenation is obtained, with the styrene with ethylene-propylene rubber flexible segment-(ethylene-propylene)-styrene block copolymer (SEPS), be exemplified as the polystyrene type elastic body.Simultaneously, styrene-ethylene-butylene-alkene crystalline copolymer (SEBC), it is the segmented copolymer of polystyrene and crystalline polyolefin, is exemplified as the polystyrene type elastic body.
Preferably, in second resin, the weight ratio of polystyrene type elastic body and polyphenylene oxide normally 8: 2-2: 8.
In addition, in second resin, the elastomeric part of polystyrene type resin or polystyrene type can be carried out sour modification.By the way, this expression phrase " carries out sour modification " and is meant the part of polystyrene type resin or the elastomeric molecular skeleton of polystyrene type and handled by organic acid such as maleic acid.
In addition, only be and the situation of prior art 1 similar polyphenylene oxide that because the increase of extrusion pressure, this resin can not be extruded for second resin.Therefore, the defective outward appearance of clad optical fiber can take place.In addition, clad optical fiber has the characteristic (according to this characteristic, even senior light-transfer characteristic is kept when temperature variation) that poor heatproof degree changes.Therefore, this processing distortion tends to improve.
Second resin combination contains second resin of metal hydroxides/per 100 weight portions of second resin and 100-250 weight portion.Magnesium hydroxide and aluminium hydroxide preferable examples are metal hydroxides.
Because the content of metal hydroxides is equal to or higher than second resin of 100 weight portions/per 100 weight portions, this anti-flammability is enhanced.In addition, because that the content of metal hydroxides is equal to or less than second resin of 250 weight portions/per 100 weight portions is the same, the processing characteristics of extruding of second resin combination is guaranteed.Therefore, this has solved the problem of outward appearance.
Second resin combination contains second resin of nitrogen type flame retardant/per 100 weight portions of second resin and 10-100 weight portion.
The nitrogen based flameproofing is not limited to specific fire retardant, as long as the nitrogen based flameproofing does not have halogen group.Melamine cyanurate, melamine derivative, three (beta-cyano ethyl) isocyanuric acid ester etc. can be enumerated as the nitrogen based flameproofing.Clad optical fiber with high flame retardant can obtain by using this type of nitrogen based flameproofing.In addition, the generation of toxic gas and polyphosphoric acid can reduce when the burning clad optical fiber.Therefore, can obtain environment is had the clad optical fiber of less load.
When the content of this nitrogen based flameproofing was lower than second resin of 10 weight portions/per 100 weight portions, anti-flammability did not show fully.On the contrary, when the content of nitrogen based flameproofing surpasses second resin of 100 weight portions/per 100 weight portions, on the surface of clad optical fiber, produce defective outward appearance.
As mentioned above, through adjusting, require second coat to add the nitrogen type flame retardant of the metal hydroxides of 100-250 weight portion and 10-100 weight portion in second resin of 100 weight portions according to clad optical fiber according to the present invention.Constitute for this, the metal hydroxides of demonstration heat absorptivity is added in second resin and has the nitrogen type flame retardant that reduces effect of combustion and also is added in second resin when burning.Therefore, can demonstrate high anti-flammability.In addition, the nitrogen type flame retardant that will be lower than the metal hydroxides of 250 weight portions and be lower than 100 weight portions joins in second resin.Therefore, when making clad optical fiber, can advantageously carry out fibre-optic coating by resin combination being extruded into optical fiber.
Preferably, the Young modulus of second coat 16 is 100MPa-800MPa under 25 ℃ temperature.By the way, Young modulus is according to JIS K7113, the result who uses test piece No.2 to measure.
Preferably, the type and the content of second resin by regulate constituting second resin combination, the type of nitrogen type flame retardant and content, and the type of following adjuvant and content, the Young modulus of second coat 16 is set in the above-mentioned scope.
According to application requirements, second resin combination can contain hindered amine as light stabilizer (HALS), oxidation inhibitor (sulphur type oxidation inhibitor or the like), lubricant, antioxidant etc.LA-52 (by Asahi DenkaCo., Ltd. makes for four (1,2,2,6,6-pentamethyl 4-piperidyl) 1,2,3,4-butane tetracarboxylic acid esters) is exemplified as this light stabilizer.Seenox 412S (pentaerythrite four (3-lauryl thiopropionate)) or analog are exemplified as sulphur type oxidation inhibitor.Moisture resistance and the thermotolerance that the use of light stabilizer and sulphur type oxidation inhibitor strengthens this light stability and second coat is enhanced, so light stabilizer and sulphur type oxidation inhibitor are preferred.
Additionally, by with known plastifier, softening agent, Rubber Softener, processing oil, extending oil, and compounding ingredient as crosslinking chemical, join in second resin as adjuvant, the Young modulus of second coat 16 can be set in the above-mentioned scope.Paraffin oil, non-aromatics Rubber Softener etc. can be enumerated as Rubber Softener.
Preferably, second resin combination is by mixing its each formation that becomes to assign to.By using known melt mixer, as Banbury mixer, the pressure kneader, or the mixer of twin shaft mixes each composition.
Preferably, the optical fiber 13 that is used for according to clad optical fiber 10 of the present invention is the ultraviolet curing resin layers that provide on the external peripheral surface of glass fibre 11 as first coat 12.Particularly, have the optical fiber of the external diameter (Dp) of 0.240mm-0.260mm, it is by producing for the glass fibre 11 with 0.125mm external diameter applies the ultraviolet curing resin layer, and preferable examples is an optical fiber 13.Glass fibre 11 contains silica glass as major component.Quilts such as urea alkane acrylate resin generally believe it is the resin of ultraviolet curing resin layer 12.These resins can use ad lib.In addition, internal layer and outer layer (having double-decker) and the painted outermost layer that constitutes by the physical property value differs from one another are known as ultraviolet curing resin layer 12.These layers also can use ad lib.
Preferably, the Young modulus of the first ultraviolet curing resin layer is set to 0.5MPa-2MPa, and the Young modulus that the Young modulus of the second ultraviolet curing resin layer is set to 5MPa-1500MPa and painted layer is set to 500MPa-1500MPa.
For this Young modulus of solid line, preferably by mixing urea alkane acrylate, it is by PTMEG, isophorone diisocyanate and hydroxymethyl acrylate react each other and obtain, with the N-caprolactam, isobornyl acrylate, the nonanediol acrylate, with the nonylphenol acrylate, they are polymerization unsaturated monomer and Lucirin TPO, its (being made by BASFcorporation) is a light trigger, with four { methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl) acrylate } methane, γ-Qiu Jibingjisanjiayangjiguiwan and 2,2,6,6-tetramethyl-4-piperidyl alcohols, they are as other adjuvant, to its radiation ultraviolet light, make the resin of the first ultraviolet curing resin layer then.
Preferably, by mixing urea alkane acrylate, it is by polyoxypropyleneglycol, toluene diisocyanate and hydroxyethyl acrylate are reacted each other and are obtained, with the N-caprolactam, with tristane dimethanol acrylate, they are polymerization unsaturated monomers, with Lucirin TPO, its (being made by BASF corporation) and Irgacure 184 (by Ciba SpecialtyChemicals Inc.) are light triggers, with four-{ methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl) acrylate } methane, it is as another kind of adjuvant, to its radiation ultraviolet light, make the resin of the second ultraviolet curing resin layer then.
In addition, this painted layer forms the ultraviolet curing resin layer usually.By hybrid epoxidized acrylate, it is reacted by bisphenol-A and (methyl) acrylic acid 2-hydroxybutyl ester and obtains, and/or urea alkane acrylate, it is by polyoxypropyleneglycol, toluene diisocyanate and hydroxyethyl acrylate are reacted and are obtained, and bisphenol-A-oxirane-modification acrylate, trimethylolpropane tris hydroxyethyl (methyl) acrylate, with the silicone acrylate, they are as polymkeric substance unsaturated monomer and benzophenone and benzoin ethers, and both are as light trigger, with four-{ methylene-3-(3-5-di-t-butyl-4-hydroxyphenyl) acrylate } methane, it is used as another kind of adjuvant, and to its radiation ultraviolet light, makes painted layer.
Therefore, the first ultraviolet curing resin layer is set at flexible layer, and the second ultraviolet curing resin layer is set at solid layer.Therefore, the side pressure that optical fiber 13 is accepted (external pressure of accepting from the external peripheral surface of optical fiber 13, the especially pressure of accepting before second resin bed 16 is provided on the optical fiber 13) is absorbed by the second ultraviolet curing resin layer.When this pressure can't allow the second ultraviolet curing resin layer fully absorb too greatly, therefore this pressure can have been reduced because glass fibre 11 is accepted the caused optical transmission loss of pressure by first ultraviolet curing resin layer buffering.
The preferred size that constitutes the layer of optical fiber 13 is as described below:
The external diameter of glass fibre 11: 125 μ m.
Be included in the external diameter of the concentricity part of the first ultraviolet curing resin layer: 200 μ m always.
Be included in the external diameter of the concentricity part of the second ultraviolet curing resin layer: 245 μ m always.
Be included in the external diameter of the concentricity part of dyed layer: 255 μ m always.
The diameter (Ds) that wherein always is included in the concentricity part of second clad 16 can be exemplified as form according to the clad optical fiber 10 of embodiment of the present invention for a kind of form of 0.8mm-1.0mm.
Clad optical fiber 10 preferred being applied on the optical fiber 13 by second resin combination that will constitute second coat 16 according to embodiment of the present invention are made, and this is described hereinafter.
That is to say, as shown in Figure 2, optical fiber 13 unwinding and be supplied to extruder 33 from the bobbin winder bracket 31 by tenslator 32.By the way, this extruder 33 has the holding portion 33A that held second resin combination and can second resin combination be applied over crosshead 33C on the neighboring of optical fiber 13 by extruding second resin combination.Preferably, when second resin combination was in molten state, second resin combination was applied on the neighboring of optical fiber 13.Usually, this extruder 33 has the well heater (not shown) in the precalculated position.
Therefore subsequently, the composition of extruding from extruder 33 is directed to cooling water tank 34, cools off and solidifies this external coating 16.Therefore, formed clad optical fiber 10.Then, clad optical fiber 10 is wrapped in by tenslator 35 and furls on the dish 36.
In the clad optical fiber 10 according to this embodiment, second coat 16 can have form that second coat 16 wherein is made of single coat or the form be made up of two or more coats of second coat 16 wherein.Fig. 3 (A) has shown that second coat wherein comprises the schematic cross sectional views of the clad optical fiber 50 of two or more coats.
As shown in Fig. 3 (A), in the clad optical fiber 50 according to embodiment of the present invention, internal layer 54 and outer 55 is provided on the external peripheral surface of this optical fiber 53 that first coat 52 is provided on the neighboring of glass fibre 51 as second coat 56 on away from the direction of glass fibre 51 at these one by one.By the way, as shown in the schematic cross sectional views in Fig. 3 B, first coat 52 provides the first ultraviolet curing resin layer 52A, and the second ultraviolet curing resin layer 52B and dyed layer 52C are arranged on the direction of these layers away from glass fibre 51 one by one.
In second coat 56, two resin combinations that constitute internal layer 54 and outer 55 separately totally belong to second resin combination.Second resin combination that is used for this second coat 56 contains base resin (constituting internal layer and outer field resin), this base resin with the metal hydroxides of 100-250 weight portion and the nitrogen type flame retardant of 10-100 weight portion/per 100 weight portions, do not contain halogen, be similar to second resin combination (Fig. 1) that is used for above-mentioned second coat 16.Adjuvant, as hindered amine as light stabilizer (HALS), oxidation inhibitor (sulphur type oxidation inhibitor or analog), lubricant, antioxidants etc. can add in the base resin.
Preferably, in clad optical fiber 50, this internal layer 54 uses the polystyrene type thermoplastic resin, polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials is as base resin.Preferably, internal layer 54 requires the metal hydroxides of 100-250 weight portion and the base resin 100 of this internal layer 54 of formation of nitrogen type flame retardant/per 100 weight portions that are lower than 100 weight portions are added in this base resin through adjusting.
Preferably, outer 55 use the polystyrene type thermoplastic resin, polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials is as base resin.Preferably, outer 55 through adjusting, and requires the metal hydroxides of 100-250 weight portion and the base resin 100 of this skin 55 of formation of nitrogen type flame retardant/per 100 weight portions that are lower than 100 weight portions are added in this base resin.
Preferably, in coating fiber glass core 50 according to embodiment of the present invention, the Young modulus of internal layer 54 be 1MPa-100MPa (more preferably, 5MPa-50MPa).Preferably, in coating fiber glass core 50 according to embodiment of the present invention, outer 55 Young modulus be 200MPa-1500MPa (more preferably, 250MPa-1000MPa).Preferably, the external diameter (Dp) that always is included in the concentricity part of internal layer 54 is 0.3mm φ-0.7mm φ (more preferably, 0.35mm φ-0.60mm φ).Preferably, the external diameter (Ds) that always is included in outer 55 concentricity part is 0.75mm φ-1.0mm φ (more preferably 0.85mm φ-0.95mm φ).By the way, the Young modulus of internal layer 54 and skin 55 is preferably regulated according to the type and the interpolation of the compound that constitutes internal layer 54 and outer 55.
Therefore, the first ultraviolet curing resin layer is set at flexible layer, and the second ultraviolet curing resin layer is set at solid layer.Therefore, the side pressure accepted of optical fiber 50 (external pressure of accepting from the external peripheral surface of optical fiber 50) is absorbed by outer 55.Can't allow outer 55 fully to absorb the time, therefore this pressure can have been reduced because pressure is accepted caused optical transmission loss by glass fibre 51 by internal layer 54 bufferings even when this pressure is too big.
More preferably, the Young modulus of the second ultraviolet curing resin layer 52B is 5MPa-600MPa.When the Young modulus of the second ultraviolet curing resin layer 52B was lower than 5MPa, this external pressure was difficult to absorb.Glass fibre is damaged easily.On the other hand, when Young modulus surpassed 600MPa, the cutter that coat is removed instrument 20 (below will describe) was difficult to cut among the second ultraviolet curing resin layer 52B.Therefore, first coat 52 is difficult to divest from clad optical fiber.
As shown in Fig. 3 (B), clad optical fiber 50 according to embodiment of the present invention designs through configuration, require first coat 52 to provide the first ultraviolet curing resin layer 52A, the second ultraviolet curing resin layer 52B and dyed layer 52C, these are arranged on these directions away from glass fibre 51 therein.In order to obtain this clad optical fiber 50, usually at first on the neighboring of glass fibre 51, provide the first ultraviolet thermoset resin layer 52A and the second ultraviolet thermoset resin layer 52B and then by using resin to apply equipment and ultraviolet radiation apparatus provides dyed layer 52C thereon.Therefore, preferably obtain optical fiber 53.
By will being exemplified as the dye compositions that constitutes this dyed layer 52C as the composition that the pigment (organic pigment or analog) of colorant and known pigment dispersing agent add in the ultraviolet-curable resin composition to be obtained.In addition, dye compositions can preferably contain other curable oligomers, and as epoxy resin (methyl) acrylate, urea alkane acrylate, or ester type acrylate are as oligomer.
The preferred size that constitutes the layer of optical fiber 53 is as described below:
The external diameter of glass fibre 51 (Dg): 125 μ m.
Be included in the external diameter (Du1) of the concentricity part of the first ultraviolet curing resin layer 52A: 200 μ m always.
Be included in the external diameter (Du2) of the concentricity part of the second ultraviolet curing resin layer 52B: 245 μ m always.
Be included in the external diameter (Dc) of the concentricity part of dyed layer 52C: 255 μ m always.
Subsequently, second coat 56 is applied on the neighboring of the optical fiber 53 that obtains in the above described manner.Therefore, preferably produce clad optical fiber 50.
That is to say, as shown in Figure 4, the unwinding and be fed to extruder 63 from the bobbin winder bracket 61 of this optical fiber 53 by tenslator 62.By the way, extruder 63 has the first holding portion 63A that has held the composition that is used for internal layer 54, the second holding portion 63B that has held the composition that is used for skin 55, with crosshead 63C, composition that the latter can be by sequentially extruding internal layer 54 and outer 55 composition and second coat 56 is applied on the neighboring of optical fiber 53.Preferably, when composition was in molten state, the composition of the composition of internal layer 54 and skin 55 was applied on the neighboring of optical fiber 53.Usually, this extruder 63 has the well heater (not shown) in the precalculated position.
Therefore subsequently, the composition of extruding from extruder 63 is directed to cooling water tank 64, cools off and solidifies second coat 56.Therefore, formed clad optical fiber 50.
Preferably, the amounts (dB/km) that defined loss changed below clad optical fiber 10 and 50 required on constituting are equal to or less than 0.2dB/km and more preferably, and the amount of loss variation is equal to or less than 0.1dB/km:
The amount that loss changes: the maximum loss on the loss amount that produces in test heat cycle changes with lowest loss and changes (in dB/km, under the wavelength of 1.55 μ m and just comprise the loss amount that after on-test, produces) between quantity variance, this test remain under (40) ℃ 0.5 hour by temperature wherein by repetition and wherein temperature remain in and the heat cycle of forming in 0.5 hour under 85 ℃ carry out.
In order to satisfy and the relevant condition of test heat cycle, preferably, first resin combination that constitutes first coat contains first resin and second coat be made up of ultraviolet curing resin and has single layer structure.By the way, first resin is meant the resin of first resin combination.
In addition, when the clad optical fiber process is adjusted, requiring first resin is the silicon resin composition, second coat is the resin combination that contains polyphenylene oxide, the external diameter that always is included in the concentricity part of first coat is 0.4mm, when the external diameter that always is included in the concentricity part of second coat is 0.8mm, be similar to prior art 1, the linear expansion coefficient difference between first coat and second coat is achieved.This is because the big thickness of first coat causes.Therefore, when the clad optical fiber according to prior art 1 had experienced unexpected variation on temperature, uneven stress was in glass fibre.Therefore, glass fibre easily twists.The amount that loss changes in test heat cycle is greatly.Therefore, for the clad optical fiber of prior art 1, loss will increase because of temperature variation.
In addition, in order to meet and the relevant condition of test heat cycle, preferably, the linear expansion coefficient of second resin combination is equal to or less than 4.0 * 10
-4(1/K).By the way, this linear expansion coefficient is by solidifying the linear expansion coefficient of formed of second resin combination.
When the linear expansion coefficient of second resin combination surpasses 4.0 * 10
-4In the time of (1/K), because variation of temperature, the expansion of second resin combination or the amount of contraction can increase.Therefore, in glass fibre, produce stress and tiny bending.Therefore, the amount of loss variation tends to surpass 0.2dB/km.
Further preferably, require on constituting according to the clad optical fiber 10 of embodiment of the present invention and 50 below defined processing distortion be equal to or less than 150 μ m:
Processing distortion: the distance between the end face of the end face of glass fibre and second coat in 168 hours the clad optical fiber of thermal treatment under 120 ℃ temperature.
Owing to set the processing distortion in above-mentioned scope, the thermal stress of extruding-putting on the glass fibre (with first coat) in the moulding process is little.Therefore, can estimate, even when owing to reasons such as tests heat cycle temperature being changed, the degeneration on characteristic as the increase owing to the caused loss of temperature variation, is little.Simultaneously, owing to set the processing distortion in above-mentioned scope, the amount of relative motion is little on the length direction between glass fibre and the coat.Therefore, the performance that clad optical fiber of the present invention stretches out in piston-like (by for a long time clad optical fiber being applied the unexpected variation of temperature, the performance that first coat that comprises glass fibre stretches out from the end face of second coat) is excellent.
By the way, are cable (or electric wires) according to the equipment of prior art 2, the latter adds fire retardant (non-nitrogen type flame retardant is to estimate to use) to through adjusting the outside surface at least and the whole foreskin of the insulator that covers conductor.Patent documentation 2 has been described the material according to the insulator of prior art 2, and it contains polyphenylene oxide, and low density polyethylene and SEBS are as resin Composition.Even for the situation of power cable, the end face of conductor can stretch out (this phenomenon is called as " outstanding (protrusion) " sometimes) from the end face of insulator.
Yet, even when " giving prominence to " takes place, for example, when this cable when its end face is connected on another communication means, the conduction fault can not take place.Yet when clad optical fiber is connected on another communication means when " give prominence to " takes place with its end face, unintentional stress is applied in glass fibre, light-transfer characteristic decline as a result and can break at worst case lower-glass fiber.
Therefore, even on the insulator according to prior art 2 is applied over according to the clad optical fiber of prior art 1 time, be that according to the insulator of prior art 2 and difference the former insulator does not comprise nitrogen type flame retardant according to the insulator of the clad optical fiber of embodiment of the present invention.Therefore, the clad optical fiber according to embodiment of the present invention can't obtain from prior art.In addition, those technician of the prior art can not think usually: the insulator according to prior art 2 that causes the problem of fibre-optic " giving prominence to " is applied on the clad optical fiber according to embodiment of the present invention.
Above-mentioned condition, wherein " linear expansion coefficient of second resin combination is set at and is equal to or less than 4.0 * 10
-4(1/K) " and wherein " defined processing distortion is set at and is equal to or less than 150 μ m " is by allowing second resin combination that second resin combination contains metal hydroxides/per 100 weight portions of 100-250 weight portion reach.
In order to make the connector mounted clad optical fiber according to embodiment of the present invention, preferably, first resin combination that constitutes first coat contains first resin that is made of ultraviolet curing resin.In addition, use clad optical fiber, its second coat has double-decker.Below describe clad optical fiber, it is equipped with connector, makes by using clad optical fiber 50, and its second coat has and comprises two or more layers structure.
At first, by using coat to remove the end that instrument 20 (referring to Fig. 7) is processed clad optical fiber 50.That is, clad optical fiber 50 remains on coat and removes among the V-shaped groove 23a of instrument 20.Then, the part of clad optical fiber 50, it is positioned at the distance apart from the about 30mm-100mm of end of this clad optical fiber 50, is tightened up instrument 24 and clamps.Subsequently, tabular leverage component 21a, 21b is close to each other and carry out one and cut off.By the way, as shown in Fig. 5 (A), coat is removed instrument 20 through the configurations design, requires when tabular leverage component 21a and 21b do not contact with each other, and the cutting edge 22A of cutter 22 (corresponding to the summit of cutting off) can not arrive glass fibre.Therefore, glass fibre 51 is not damaged.In addition, second coat 56 prescinds for certain.
Subsequently, this cutter is along the direction motion at the arrow shown in Fig. 5 (A).Then, first coat 52 separates with glass fibre 51 with second coat 56, thereby pulls out from glass fibre.Second coat 56 fully cuts off.Therefore, second coat is removed with cutter 22.On the contrary, first coat 52 does not fully cut off (summit of cutting off is arranged in first coat 52).Even when cutter 22 motion, first coat 52 temporarily is stretched therefore.A part that closely adheres to first coat 52 on the glass fibre 51 is not with cutter 22 motions (referring to Fig. 5 (b)).In this time, second coat 56 slides on first coat 52.In addition, the part of first coat 52, it be positioned at cutter 22 near, therefore be compressed.Then, when coat was removed instrument 20 and further moved, first coat 52 was torn.Therefore, first coat 52 ' is compressed by the separation of this coat and the fragment removed.Therefore, in the length (referring to Fig. 5 (C)) on the pull-out direction of second coat 56 ' of being shorter in length than on the pull-out direction of first coat 52 '.
Preferably,, require through the configurations design according to the clad optical fiber 50 of embodiment of the present invention " in the separation of coat with remove the length (L of first coat 52 ' in the fragment
Uv) divided by the length (L of second coat 56 ' that separates
SH) " (below be expressed as " L
Uv/ L
SH") be 15%-85%.By the way, the situation that does not wherein have the ultraviolet curing resin layer to be present in the resin bed of this separation is defined as " L
Uv/ L
SH=0% ".Wherein equal the situation of the length on the pull-out direction in resin coating layer, be defined as " L in the length on the pull-out direction of ultraviolet curing resin layer
Uv/ L
SH"=100% ".Therefore, the sliding of first coat 52 ' on second coat 56 ' suitably regulated.Therefore, first coat 52 residual on glass fibre usually can not cause.In addition, the destruction of glass fibre 51 is seldom taken place.Because there be not the residual of ultraviolet curing resin layer, optical link loss when being connected on the clad optical fiber, connector is arranged seldom.
By use coat remove instrument 20 closed this tabular lever 21a with 21b so that separate the needed power of compound coat (it is by obtaining at first coat, 52 increases, second coat 56) normally about 2kgf from glass fibre 51.The speed that first coat 52 and second coat 56 are removed from glass fibre is about 500mm/min.Remove instrument 20 to pull out the power of first coat 52 and second coat 56 are pullout forces (drawing-out force) by removing coat at this moment.
In order to set L
Uv/ L
SHAt 15%-85%, preferably, the friction factor between dyed layer 52C (outermost layer of first coat 52) and internal layer 54 is adjusted to 0.2-0.5.
Regulate the type of the compound that constitutes these layers and the method for interpolation and can be enumerated as the method for friction factor in above-mentioned scope that is set between dyed layer 52c and the internal layer 54.Regulate the method for above-mentioned friction factor preferably enumerates by interpolation release agent in dyed layer 52c or internal layer 54.
The dyed layer 52c that contains release agent preferably obtains by using in the dyed layer composition, adds the silica-based acrylate as the part of reactive diluent monomer therein.Additionally, silicone oil can be used as release agent and is added in the coloured composition.
In addition, silicon compound as silicone oil and release agent silicon (varnish coating, rubber mold), can be enumerated as the release agent that is added in the internal layer 54.In order to obtain the friction factor in above-mentioned scope, usually, the release agent in the range of resin of this internal layer 54 of formation of 5-10 weight portion/per 100 weight portions is added in the resin that constitutes this internal layer.
In this case, more particularly, consider the Young modulus of internal layer 54 and outer 55, preferably, the composition of internal layer 54 and skin 55 is set as follows.
Internal layer: the polyolefin-type thermoplastic resin of per 100 weight portions contains the metal hydroxides of 100-250 weight portion and is lower than the nitrogen type flame retardant of 100 weight portions.
Outer: the polyolefin-type thermoplastic resin of per 100 weight portions and/or thermoplastic elastomer resin contain the metal hydroxides of 100-250 weight portion and are lower than the nitrogen type flame retardant of 100 weight portions.
In addition, preferably, be equal to or less than 2.5kgf at the pullout forces of pulling out first coat 52 and second coat 56 from glass fibre 51.Therefore, first coat 52 and second coat 56 can easily (not felt big load power) and pulled out from glass fibre, therefore expose glass fibre 51 by using coat to remove instrument 20.According to the present invention, this pullout forces is defined in the power (that is, drawing this coat to remove the power of instrument 20) that applies on the direction of pulling out resin bed.
In order to set this pullout forces for being equal to or less than 2.5kgf, this setting value can be by improving the technology (shape of screw rod of material (it has excellent Extrusion Flow under molten state) and minimizing extrusion pressure, the shape at mouthful mould tip) adjusts, as described in the narration of embodiment.
Connector mounted clad optical fiber according to embodiment of the present invention is then described.
The clad optical fiber 50 of terminal formed coating end face 56A that can be by will having glass fibre expose portion 51A and processing clad optical fiber 50 according to the connector mounted clad optical fiber 19 (referring to Fig. 6) of embodiment of the present invention be connected on the connector 18 and makes, and this connector has been introduced has empty 17A so that can hold the lasso 17 of glass fibre expose portion 51A.More particularly, allow coat end face 56A near the butt joint end face 17B of lasso so that be contained among the empty 17A by glass fibre expose portion 51A with a kind of state, in this state, glass fibre expose portion 51A is not applied distortion power.Usually, clad optical fiber 50 and this connector 18 are connected to each other to keep this state by tightening up the utensil (not shown).Therefore, connector mounted clad optical fiber 19 is not because the caused loss of distortion.
Subsequently, the unlimited end face 17C of the end face 51B of glass fibre and lasso is processed to required shape, for example by polishing (grounded).By the way, flat surface, sphere and curved surface can be listed as the surface that the unlimited end face 17C by the end face 51B of glass fibre and lasso is formed, and suitably select according to the technical specification of connector mounted clad optical fiber 19.
For connector mounted clad optical fiber 19, in glass fibre expose portion 11A, there be not the residual of ultraviolet curing resin layer 12.Therefore, glass fibre expose portion 51A is contained among the empty 17A.The end face 56A that coats is caused the butt joint end face 17B near lasso.In addition, the center of the end face 51B of glass fibre exists on desired location.Therefore, for connector mounted clad optical fiber core 19, do not have because the caused junction loss of skew of the position of glass fibre.Therefore, connector mounted clad optical fiber core 19 is excellent on light-transfer characteristic.
In addition, clad optical fiber 19 uses are according to the wired clad optical fiber 50 of embodiment of the present invention.Therefore, connector mounted clad optical fiber 19 is refractabilitys.Even when burning, do not produce toxic gas.
＜embodiment 〉
Below, by enumerating embodiment and the comparative example describes the present invention in detail.Yet, the invention is not restricted to these embodiment.
[embodiment 1-3]
(manufacturing of second resin combination)
Metal oxide and nitrogen type flame retardant are added in second resin of 100 weight portions, according at the composition described in the table 1.Preparation is used for embodiment 1, second resin combination among 2-1 to 2-3 and the 3-1 to 3-2.By use the twin shaft mixer (the screw rod external diameter: 45mm φ, L/D=32) and cut off the lines of drawing and produce pellet and obtain second resin combination.
(manufacturing of clad optical fiber)
Optical fiber uses to have to be provided at and contains the optical fiber of silica glass as the ultraviolet curing resin layer (urea alkane acrylate resin layer) on the neighboring (external diameter is 125 μ m) of the glass fibre of key component.The ultraviolet curing resin layer has three-decker, comprising the first ultraviolet curing resin layer, and the second ultraviolet curing resin layer, and dyed layer.The external diameter that always is included in the concentricity part of the first ultraviolet curing resin layer is 200 μ m.The external diameter that always is included in the concentricity part of the second ultraviolet curing resin layer is 245 μ m.The external diameter that always is included in the concentricity part of dyed layer is 255 μ m.The Young modulus of the first ultraviolet curing resin layer is 1MPa (under 25 ℃).The Young modulus of the second ultraviolet curing resin layer is 400MPa (under 25 ℃).The Young modulus of dyed layer is 1100MPa (under 25 ℃).According to embodiment 1, the clad optical fiber of 2-1 to 2-3 and 3-1 to 3-3 is by providing second resin bed to make (outer diameter D s:0.9mm) according to said method on this fibre-optic neighboring.Therefore, (external diameter of screw rod: 40nm φ L/D=25) is used as the extruder that optical fiber applies second coat here to the single shaft extruder.This extruder is connected to crosshead (corresponding to crosshead 33C)
[embodiment 4]
(manufacturing of second resin combination)
By according in second resin that metal hydroxides and nitrogen type flame retardant is added to 100 weight portions at the composition described in the table 2 and carry out and the similar method of embodiment 1-3 method therefor, prepare second resin combination that is used for embodiment 4-1 and 4-2.
(manufacturing of clad optical fiber)
According to embodiment 1-3 in the similar method of method therefor, this optical fiber uses to have at a kind of optical fiber that the ultraviolet curing resin layer (urea alkane acrylate resin layer) that provides on the neighboring (external diameter is 125 μ m) of silica glass as the glass fibre of key component is provided.The ultraviolet curing resin layer has three-decker, comprising the first ultraviolet curing resin layer, and the second ultraviolet curing resin layer, and dyed layer.The external diameter that always is included in the concentricity part of the first ultraviolet curing resin layer is 200 μ m.The external diameter that always is included in the concentricity part of the second ultraviolet curing resin layer is 245 μ m.The external diameter that always is included in the concentricity part of dyed layer is 255 μ m.The Young modulus of the first ultraviolet curing resin layer is 1MPa (under 25 ℃).The Young modulus of the second ultraviolet curing resin layer is 400MPa (under 25 ℃).The Young modulus of dyed layer is 1100MPa (under 25 ℃).Subsequently, this internal layer and this skin, they have at the composition described in the table 2, and (external diameter of screw rod: 40nm φ L/D=25) is provided on this fibre-optic neighboring, as shown in Figure 4 by using biaxial extruder.Therefore, made clad optical fiber (outer diameter D s:0.9mm) according to this embodiment 4-1 and 4-2.
[comparative example 1 and 2]
According to the similar method of embodiment 1-3 method therefor, produce clad optical fiber according to comparative example 1 and 2.The composition of described second resin combination and the eigenwert of clad optical fiber are described in the table 1.
Table 1: high flame retardant 0.9mm φ clad optical fiber
| Second resin combination | Embodiment 1 | Embodiment 2-1 | Embodiment 2-2 | Embodiment 2-3 | Embodiment 3-1 | Embodiment 3-2 | Comparative Examples 1 | Comparative Examples 2 |
| Base polymer (weight portion) | ||||||||
| 1. PPPE (polyphenylene oxide) | ??35 | ??40 | ??40 | ??40 | ??35 | ??35 | ??35 | ??35 |
| 2. PS type elastic body I | ??65 | ??60 | ??60 | ??60 | ??30 | ??65 | ??65 | |
| 3. PS type elastic body II | ??65 | ??35 | ||||||
| 4. PS type elastic body III | ||||||||
| 5. PS type elastic body IV | ||||||||
| 6. PS type elastic body V | ||||||||
| 7. PS type elastic body VI | ||||||||
| Crosslinking coagent | ||||||||
| The interpolation of metal hydroxides | ??200 | ??200 | ??250 | ??150 | ??180 | ??150 | ??200 | ??200 |
| Silicon type lubricant | ??2 | ??2 | ??2 | ??2 | ??2 | ??2 | ??2 | ??2 |
| Nitrogen type flame retardant | ??10 | ??25 | ??25 | ??25 | ??100 | ??25 | ??5 | ??120 |
| The clad optical fiber physical property | ||||||||
| Linear expansion coefficient (* 10 -4)[1/K] | ??1.3 | ??1.4 | ??1.4 | ??1.5 | ??1.3 | ??1.3 | ??1.3 | ??1.2 |
| Young modulus [Mpa] | ??275 | ??250 | ??270 | ??235 | ??280 | ??270 | ??270 | ??290 |
| The optical fiber characteristic | ||||||||
| The processing distortion (120 ℃ * 168hr) [μ m/m] | ??120 | ??115 | ??100 | ??140 | ??105 | ??110 | ??135 | ??90 |
| Optical transmission loss characteristic (room temperature) [dB/km] | ??0.197 | ??0.197 | ??0.204 | ??0.205 | ??0.198 | ??0.194 | ??0.205 | ??0.202 |
| The performance that the heatproof degree changes | ??0.05 | ??0.06 | ??0.04 | ??0.08 | ??0.05 | ??0.05 | ??0.06 | ??0.04 |
| ??Δα(-40-85℃)[dB/km] | ||||||||
| Outstanding amount (μ m/m) | ??80 | ??80 | ??65 | ??90 | ??100 | ??60 | ||
| Outward appearance | ??○ | ??○ | ??○ | ??○ | ??○ | ?○ | ??○ | ??× |
| Anti-flammability (UL1581 burning test) | ??○ | ??○ | ??○ | ??○ | ??○ | ?○ | ??× | ??○ |
Note: the type of PS type elastic body I:SEBS (S/EB=3.5/6.5), the type (S/EB/MAH=3.5/6/0.5) of PS type elastic body II:SEBS
The type (S/EB=1.0/9.0) of PS type elastic body III:SEBS,
The type (S/EB/MAH=1.0/8.0/0.5) of PS type elastic body IV:SEBS,
The type (S/EB=9.0/1.0) of PS type elastic body V:SEBS,
The type (S/EB/MAH=8.0/1.5/0.5) of PS type elastic body VI:SEBS,
MAH: copolymer-maleic anhydride
Table 2: high flame retardant 0.9mm φ clad optical fiber
| Second resin combination | Embodiment 4-1 | Embodiment 4-2 | ||
| Internal layer | Outer | Internal layer | Outer | |
| Base polymer (weight portion) | ||||
| 1. PPPE (polyphenylene oxide) | ??20 | ??80 | ??25 | ??85 |
| 2. PS type elastic body I | ||||
| 3. PS type elastic body II | ||||
| 4. PS type elastic body III | ??79 | |||
| 5. PS type elastic body IV | ??74 | |||
| 6. PS type elastic body V | ??20 | |||
| 7. PS type elastic body VI | ??15 | |||
| Crosslinking coagent | ??1 | ??1 | ||
| The interpolation of metal hydroxides | ??240 | ??240 | ??250 | ??150 |
| Silicon type lubricant | ??2 | ??2 | ||
| Nitrogen type flame retardant | ??30 | ??30 | ??20 | ??30 |
| Auxiliary agent | ||||
| The clad optical fiber physical property | ||||
| Linear expansion coefficient (* 10 -4)[1/K] | ??1.8 | ??1.1 | ??1.7 | ??1.2 |
| Young modulus [Mpa] | ??120 | ??850 | ??150 | ??700 |
| The optical fiber characteristic | ||||
| The processing distortion (120 ℃ * 168hr) [μ m/m] | ??150 | ??150 | ??145 | ??145 |
| Optical transmission loss characteristic (room temperature) [dB/km] | ???????0.195 | ?????????0.186 | ||
| The performance Δ α (40-85 ℃) [dB/km] that the heatproof degree changes | ???????0.06 | ?????????0.06 | ||
| Outstanding amount (μ m/m) | ??- | ??- | ??- | ??- |
| Outward appearance | ??○ | ??○ | ??○ | ??○ |
| Anti-flammability (UL1581 burning test) | ??○ | ??○ | ??○ | ??○ |
| ??L uv/L SH(％) | ????????80 | ??????????85 | ||
The method of measuring the linear expansion coefficient of second resin combination is as follows with the method for measuring Young modulus.
(linear expansion coefficient)
The state of test film (by solidifying formed of second resin combination) is regulated according to JIS K7100.Then, this test film is by using the temperature range interscan to 100 ℃ in (60) ℃ at the TMA (Thermo-Mechanical-Analyzer) described in the JIS K 7197.Therefore, according to specifying measurement (on average) linear expansion coefficient of JIS K 7197.
(Young modulus)
Second resin combination relevant with embodiment and comparative example utilizes known device to melt and mediates, and this device is by biaxial kneader/extruder, pressure kneader, Banbury mixer, compositions such as roller.Therefore, formed membranaceous object with about 300 μ m thickness.Subsequently, resemble the test film (according to JIS K 7113) of No 2 types of dumbbell with this membranoid substance system appearance shape.Young modulus is defined as by using this test specimen and carrying out tension test as 2.5mm and pulling rate under as 1mm/ minute condition in the distance between the bench mark and measure it.
The evaluation of clad optical fiber is following to be carried out.
[processing distortion]
In heat-treating at this clad optical fiber under 168 hours the condition of heating under 120 ℃ the temperature, the latter has adjusted so that the end face of glass fibre, first coat and second coat flushes each other at clad optical fiber.After heat treated finishing, " distance between the end face of the end face of glass fibre and second coat " measured as the processing distortion.
[optical transmission loss characteristic]
By using OTDR measurement mechanism (wavelength: 1.55 μ m) measure the amount (dB) that (under 23 ℃ temperature) measures the loss of clad optical fiber.The loss of per unit length is expressed as " initial loss " (dB/km).Along with the value step-down of initial loss, clad optical fiber is significantly more excellent on light-transfer characteristic.
[performance that the heatproof degree changes (, keeping the performance of light-transfer characteristic)] regardless of temperature variation
By repeat by temperature wherein remain under (40) ℃ 0.5 hour and wherein temperature remain on the heat cycle of forming in 0.5 hour under 85 ℃, repeatedly carry out (number of times: 5) exposure test heat cycle for clad optical fiber.In exposure test heat cycle, measure amount (the dB) (wavelength: 1.55 μ m) of loss by continuous monitoring.Be expressed as the amount (dB/km) that loss changes in the number change between highest loss variation and lowest loss variation on the loss amount.The value step-down of the amount that changes along with loss, clad optical fiber is significantly more excellent on the performance that the heatproof degree changes.
[outstanding amount (piston-like is stretched out performance)]
Changing the exposure test of describing in the narration of performance heat cycle at the heatproof degree carries out 200 times for clad optical fiber.Therefore, measure the outstanding amount (distance between the end face of the end face of glass fibre and second coat) of glass fibre.Its evaluation result is described in the table 2.Along with outstanding quantitative change is low, clad optical fiber is significantly more excellent on the performance that piston-like is stretched out.
[outward appearance of clad optical fiber]
Observe the outward appearance of examining clad optical fiber and investigating clad optical fiber with feel feel clad optical fiber by using.If clad optical fiber has satisfied " roughness of surface configuration " or " the protrusion exotic that has the size of about 10 μ m-100 μ m separately " all non-existent condition, the outward appearance of then judging clad optical fiber is good (zero).On the contrary, if clad optical fiber does not satisfy this type of condition, the outward appearance of then judging clad optical fiber is bad (*).
[anti-flammability]
Test for the anti-flammability of clad optical fiber according to standard UL1581 VW-1.
That is, as shown in Figure 8, at first, the top with clad optical fiber 10 (or 50) of predetermined length is caught by grip portion 84, and the base section of clad optical fiber 10 is caught by another grip portion 85.What therefore, these optical fiber 10 process settings made it vertically is vertical direction.Absorbability cotton 83 is placed under the bottom of clad optical fiber 10.Kraft 81 usefulness pastes adhere to a shade below the place of the grip portion 84 of clad optical fiber 10.Subsequently, burner flame is ejected into a position by burner 82, and this position is than kraft 81 low 254mm (in 5 circulations, each circulates by forming 15 seconds burning time and 15 seconds fall time).By the way, should to require the length of internal flame be that the length of 40mm and flame envelope is 125mm to this burner flame.If clad optical fiber has satisfied the condition that " fire of expansion does not arrive kraft 81 " and " hanging from above of coat " (it will cause cotton 83 burnings of absorbability) do not taken place, then to be determined be acceptable to this clad optical fiber.If clad optical fiber does not satisfy this type of condition, then to be determined be unacceptable to this clad optical fiber.
[L
uv/L
SH????(％)]
(" JR-22 " is by Sumitomo Electric Industries to remove instrument relevant " coat remover JR-22 " by use with the coat shown in Fig. 7, Ltd. the trade name of the coat remover of Zhi Zaoing), remove resin bed from the part (it has the 30mm length apart from the end of this clad optical fiber) of clad optical fiber.By the way, the situation that does not wherein have the ultraviolet curing resin layer to be present in the resin bed of this separation is defined as " L
Uv/ L
SH=0% ".Wherein the situation that equals the length on the pull-out direction in resin coating layer in the length on the pull-out direction of ultraviolet curing resin layer is defined as " L
Uv/ L
SH"=100% ".By the way, pullout forces (kgf) by setting pull out speed be 500m/ minute measured.The pullout forces of the clad optical fiber of each of embodiment 4-1 and 4-2 is equal to or less than 2.5kgf.
Clad optical fiber according to this embodiment is excellent on outward appearance and anti-flammability.On the other hand, be poor on anti-flammability according to comparative example 1 clad optical fiber, because the content of nitrogen type flame retardant is too little.In addition, be poor in appearance according to comparative example 2 clad optical fiber, because the content of nitrogen type flame retardant is too big.
By the way, constitute according to each second resin combination in the middle of second coat of embodiment and comparative example's clad optical fiber and do not contain halogen and phosphorus.Therefore, the load for environment is little.That is, when second resin burnt, the generation of toxic gas can reduce.In addition, phosphate compounds flows in the rivers and lakes.Therefore, river and lake become the condition of eutrophication, and the pollution in river and lake as a result can not worsen.
Industrial applicibility
As mentioned above, the present invention can provide the clad optical fiber core, it is little and has high anti-flammability the load of environment, with the decline that reduces light-transfer characteristic, even when connector is connected on the clad optical fiber, and also can be provided at connector mounted clad optical fiber excellent on environmental characteristics, mechanical property and the light-transfer characteristic.
Claims (13)
1. clad optical fiber, second coat that provides on by the external peripheral surface at glass fibre on the fibre-optic external peripheral surface that first coat produces is provided for it.
Second resin combination that wherein constitutes second coat contains the metal hydroxides of base resin and 100-250 weight portion and the nitrogen type flame retardant of 10-100 weight portion, this base resin of per 100 weight portions,
Wherein second resin combination does not contain halogen.
2. according to the clad optical fiber of claim 1, wherein base resin is made of noncrystalline resin.
3. according to the clad optical fiber of claim 1 or 2, wherein second resin combination contains as the following a kind of component of being selected from of base resin: the one matter of polystyrene type resin, the elastomeric one matter of polystyrene type, the potpourri of polystyrene type resin and polyphenylene oxide, and the potpourri of polystyrene type elastic body and polyphenylene oxide.
4. according to the clad optical fiber of claim 3, wherein the elastomeric part of polystyrene type resin or polystyrene type is carried out sour modification.
5. according to one clad optical fiber among the claim 1-4, wherein second coat is formed by two or more coats.
6. according to one clad optical fiber among the claim 1-5, wherein clad optical fiber is equal to or less than 0.2dB/km through the amount (dB/km) that requires loss to change after constituting, should
The amount that loss changes comprises: in exposure test heat cycle, produce in the loss amount (by dB/km, under the wavelength of 1.55 μ m and comprised the loss amount that just after test, produces) on maximum loss change with the lowest loss variation between quantity variance, this test remain under (40) ℃ 0.5 hour by temperature wherein by repetition and wherein temperature remain in and the heat cycle of forming in 0.5 hour under 85 ℃ carry out.
7. according to one clad optical fiber among the claim 1-6, wherein the linear expansion coefficient of second resin combination is equal to or less than 4.0 * 10
-4(1/K).
8. according to one clad optical fiber among the claim 1-7, wherein processing is turned round and is equal to or less than 150 μ m, should
The processing distortion comprises: the distance between the end face of the end face of glass fibre and second coat in 168 hours the clad optical fiber of thermal treatment under 120 ℃ temperature.
9. according to the clad optical fiber of claim 5, wherein clad optical fiber is the resin bed of ultraviolet-curing through configuration designing requirement first coat, cut off and do not allow the summit of the face of cutting off arrive glass fibre in direction from second coat to glass fibre, when the resin bed of ultraviolet-curing and second coat separate when extracting glass fibre out from glass fibre, " separating and the ratio of length with the length of second coat that separates of the covering piece middle-ultraviolet lamp curable resin layer of removing " is 15% to 85%.
10. according to the clad optical fiber of claim 9, wherein internal layer and skin one by one therein these the layer away from being provided on the fibre-optic external peripheral surface as second coat on the fibre-optic direction, this internal layer is through adjusting the polystyrene type thermoplastic resin that requires to add the metal hydroxides of 100-250 weight portion therein and be lower than nitrogen type flame retardant/per 100 weight portions of 100 weight portions, the polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials.
11. clad optical fiber according to claim 9, wherein internal layer and skin one by one therein these the layer away from being provided on the fibre-optic external peripheral surface as second coat on the fibre-optic direction, add the metal hydroxides and the polystyrene type thermoplastic resin that is lower than nitrogen type flame retardant/per 100 weight portions of 100 weight portions of 100-250 weight portion with its ectomesoderm therein through adjusting requirement, the polyolefin-type thermoplastic resin, or polyphenylene oxide, or the hybrid resin of these materials.
12. according to the clad optical fiber of claim 9, it requires the pullout forces when pulling out the ultraviolet curing resin layer and second coat from glass fibre to be equal to or less than 2.5kgf on constituting.
13. connector mounted clad optical fiber, its requires according to one clad optical fiber among the claim 1-12-it carries out configuration and design-be connected to the connector of introducing lasso by allowing end apart from this glass fibre have the part of predetermined length to expose the end face that therefore has glass fibre expose portion and coating through adjusting the back, this lasso has the cavity so that can hold the glass fibre expose portion, with the end face that coats near the butt joint end face of this lasso so that hold the glass fibre expose portion with a kind of state, the glass fibre expose portion in the cavity is not being applied distortion power under this state.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP43338/2003 | 2003-02-20 | ||
| JP2003043338A JP3912531B2 (en) | 2003-02-20 | 2003-02-20 | Coated optical fiber |
| JP44074/2003 | 2003-02-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1697990A true CN1697990A (en) | 2005-11-16 |
| CN100378483C CN100378483C (en) | 2008-04-02 |
Family
ID=33112072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800005279A Expired - Fee Related CN100378483C (en) | 2003-02-20 | 2004-02-19 | Coated optical fiber and coated optical fiber with connector |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3912531B2 (en) |
| CN (1) | CN100378483C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101988980A (en) * | 2009-07-30 | 2011-03-23 | 日立电线株式会社 | Optical fiber, tape-like optical fiber and optical module using the same |
| CN102120695A (en) * | 2010-10-13 | 2011-07-13 | 成都亨通光通信有限公司 | Optical fiber provided with fire retardant coating |
| CN101836267B (en) * | 2008-10-28 | 2012-02-29 | 住友电气工业株式会社 | Halogen-free flame-retardant insulating electric wire |
| CN102667558A (en) * | 2009-12-21 | 2012-09-12 | 住友电气工业株式会社 | Optical fiber holder and method for holding optical fiber core |
| CN109642999A (en) * | 2016-06-13 | 2019-04-16 | 住友电气工业株式会社 | Connectorized fiber optic cabling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4730281B2 (en) * | 2006-10-24 | 2011-07-20 | 日立電線株式会社 | Optical fiber coated wire |
| US20140133812A1 (en) * | 2011-06-14 | 2014-05-15 | Mitsubishi Rayon Co., Ltd. | Composition for jacketing optical fiber and optical fiber cable |
| EP2977806B1 (en) | 2013-03-22 | 2016-11-16 | Mitsubishi Rayon Co., Ltd. | Optical-fiber cable |
| EP3851890A4 (en) | 2018-09-13 | 2022-06-08 | Furukawa Electric Co., Ltd. | Optical fiber core wire and optical fiber cable |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19648799A1 (en) * | 1996-11-26 | 1998-05-28 | Basf Ag | Halogen-free, flame-retardant polystyrene molding compounds |
| JP2002088253A (en) * | 2000-09-14 | 2002-03-27 | Asahi Kasei Corp | Non-halogen flame-retardant polymer molded body |
| JP4715981B2 (en) * | 2001-01-22 | 2011-07-06 | 住友電気工業株式会社 | Flame retardant optical fiber ribbon |
-
2003
- 2003-02-20 JP JP2003043338A patent/JP3912531B2/en not_active Expired - Fee Related
-
2004
- 2004-02-19 CN CNB2004800005279A patent/CN100378483C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101836267B (en) * | 2008-10-28 | 2012-02-29 | 住友电气工业株式会社 | Halogen-free flame-retardant insulating electric wire |
| CN101988980A (en) * | 2009-07-30 | 2011-03-23 | 日立电线株式会社 | Optical fiber, tape-like optical fiber and optical module using the same |
| CN101988980B (en) * | 2009-07-30 | 2014-05-21 | 日立金属株式会社 | Optical module |
| CN102667558A (en) * | 2009-12-21 | 2012-09-12 | 住友电气工业株式会社 | Optical fiber holder and method for holding optical fiber core |
| CN102667558B (en) * | 2009-12-21 | 2014-04-09 | 住友电气工业株式会社 | Optical fiber holder and method for holding optical fiber core |
| US8861920B2 (en) | 2009-12-21 | 2014-10-14 | Sumitomo Electric Industries, Ltd. | Optical fiber holder and method for holding coated optical fiber |
| CN102120695A (en) * | 2010-10-13 | 2011-07-13 | 成都亨通光通信有限公司 | Optical fiber provided with fire retardant coating |
| CN109642999A (en) * | 2016-06-13 | 2019-04-16 | 住友电气工业株式会社 | Connectorized fiber optic cabling |
| CN109642999B (en) * | 2016-06-13 | 2020-07-28 | 住友电气工业株式会社 | Optical fiber cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004264369A (en) | 2004-09-24 |
| CN100378483C (en) | 2008-04-02 |
| JP3912531B2 (en) | 2007-05-09 |
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