WO2022191097A1 - 光ファイバ着色心線、光ファイバリボン、単心ファイバの集合体ケーブル、光ファイバリボンケーブル、およびこれらの製造方法 - Google Patents
光ファイバ着色心線、光ファイバリボン、単心ファイバの集合体ケーブル、光ファイバリボンケーブル、およびこれらの製造方法 Download PDFInfo
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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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4482—Code or colour marking
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/1065—Multiple coatings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/06—Glass compositions containing silica with more than 90% silica by weight, e.g. quartz
-
- 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/448—Ribbon cables
-
- 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
Definitions
- the present invention relates to an optical fiber colored core wire, an optical fiber ribbon, an aggregate cable of single-core fibers, an optical fiber ribbon cable, and a method for manufacturing these.
- JP 2005-162522 A Japanese Patent Publication No. 2002-524581 WO2018/062364 WO2018/062365
- the primary layer is hardened to near the saturation Young's modulus, the Young's modulus becomes high, which may cause the problem that microbend loss cannot be effectively suppressed.
- an optical fiber bare wire a primary layer formed of a first ultraviolet curable resin covering the optical fiber bare wire, and a second ultraviolet curable resin covering the primary layer and a secondary layer, wherein the Young's modulus of the primary layer is less than 70% of the saturated Young's modulus of the primary layer, and the saturated Young's modulus of the primary layer is 0.85 MPa or less.
- An optical fiber colored core wire is provided.
- the method wherein after manufacturing the optical fiber colored core wire, the Young's modulus of the primary layer is less than 70% of the saturated Young's modulus of the primary layer, and the saturated Young's modulus of the primary layer is 0.5%.
- a method for manufacturing an optical fiber colored cord characterized in that the strength is 85 MPa or less.
- a colored optical fiber core wire in which a primary layer having a sufficiently low Young's modulus is realized and microbend loss can be effectively suppressed.
- FIG. 1 is a cross-sectional view of an optical fiber colored core wire according to a first embodiment
- FIG. 1 is a schematic diagram of a manufacturing apparatus used in a method for manufacturing a colored optical fiber cord according to a first embodiment
- FIG. 4 is a flow chart of a method for manufacturing a colored optical fiber core wire according to the first embodiment
- FIG. 5 is a cross-sectional view of an optical fiber ribbon according to a second embodiment
- FIG. 10 is a schematic diagram of a manufacturing apparatus used in the method for manufacturing an optical fiber ribbon according to the second embodiment
- 6 is a flow chart of a method for manufacturing an optical fiber ribbon according to the second embodiment
- FIG. 10 is a diagram showing micro bend loss according to an example and a comparative example
- FIG. 1 is a cross-sectional view of a colored optical fiber cord 1 according to the first embodiment.
- the colored optical fiber core wire 1 includes an optical fiber bare wire 2, a primary layer 3 coated on the outer periphery of the optical fiber bare wire 2, a secondary layer 4 coated on the outer periphery of the primary layer 3, and an outer periphery of the secondary layer 4. and a colored layer 5 coated with.
- the optical fiber bare wire 2 is coated with three coating layers, ie, a primary layer 3 , a secondary layer 4 and a colored layer 5 .
- the fiber before the colored layer 5 is formed is called an optical fiber strand.
- the bare optical fiber 2 is made of, for example, quartz-based glass or the like, and transmits light.
- the primary layer 3, the secondary layer 4 and the colored layer 5 are each formed by curing an ultraviolet curable resin by irradiating ultraviolet rays.
- the ultraviolet curable resin is not particularly limited as long as it can be polymerized by irradiation with ultraviolet rays.
- the UV curable resin is polymerizable by, for example, photoradical polymerization. UV curable resins are polymerized and It is an ultraviolet curable resin having a polymerizable unsaturated group such as a curable ethylenically unsaturated group, and preferably has at least two polymerizable unsaturated groups.
- Examples of the polymerizable unsaturated group in the ultraviolet curable resin include groups having unsaturated double bonds such as vinyl groups, allyl groups, acryloyl groups, and methacryloyl groups, groups having unsaturated triple bonds such as propargyl groups, and the like. mentioned. Among these, an acryloyl group and a methacryloyl group are preferable in terms of polymerizability.
- the UV-curable resin may be a monomer, an oligomer, or a polymer that initiates polymerization and cures upon irradiation with UV rays, but is preferably an oligomer.
- the oligomer is a polymer with a degree of polymerization of 2-100.
- (meth)acrylate means one or both of acrylate and methacrylate.
- Polyether-based urethane (meth)acrylate is a polyether segment, (meth)acrylate and urethane bond, such as a reaction product of a polyol having a polyether skeleton, an organic polyisocyanate compound, and a hydroxyalkyl (meth)acrylate. It is a compound having Further, the polyester urethane (meth)acrylate is a polyol having a polyester skeleton, a polyester segment, a (meth)acrylate and a urethane bond, such as a reaction product of an organic polyisocyanate compound and a hydroxyalkyl (meth)acrylate. is a compound.
- the UV-curable resin may contain, for example, diluent monomers, photosensitizers, chain transfer agents and various additives in addition to oligomers and photopolymerization initiators.
- diluent monomers for example, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, poly(meth)acrylates are used as diluent monomers.
- the diluting monomer means a monomer for diluting the ultraviolet curable resin.
- the primary layer 3 is preferably a soft layer having a Young's modulus of 0.60 MPa or less, and has the function of buffering the external force applied to the bare optical fiber 2 .
- the primary layer 3 preferably has a Young's modulus of less than 70% with respect to the saturated Young's modulus.
- the secondary layer 4 is preferably a hard layer having a Young's modulus of 500 MPa or more, and has a function of protecting the bare optical fiber 2 and the primary layer 3 from external force.
- the colored layer 5 is colored for identifying the colored optical fiber 1 .
- the optical fiber colored core wire 1 is not limited to the configuration shown in FIG.
- the bare optical fiber 2 may be coated with four or more layers.
- an optical fiber without the colored layer 5 may be used.
- the colored secondary layer 4 may be the outermost layer of the colored optical fiber 1 .
- the secondary layer 4 is colored, the secondary layer 4 is colored by adding a coloring agent mixed with a pigment, a lubricant, or the like to the secondary layer 4 .
- the content of the coloring agent in the colored secondary layer 4 can be appropriately determined depending on the content of the pigment contained in the coloring agent, the type of other components such as the ultraviolet curable resin, and the like.
- the diameter of the bare optical fiber 2 is 80 ⁇ m or more and 150 ⁇ m or less, preferably 124 ⁇ m or more and 126 ⁇ m or less.
- the thickness of the primary layer 3 may be 5 ⁇ m or more and 60 ⁇ m or less.
- the thickness of the secondary layer 4 may be 5 ⁇ m or more and 60 ⁇ m or less.
- the thickness of the colored layer 5 can be about several ⁇ m.
- FIG. 2 is a schematic diagram of a manufacturing apparatus 10 used in the manufacturing method of the colored optical fiber 1 according to the first embodiment.
- the manufacturing apparatus 10 has a heating device 20 , a primary layer coating device 30 , a secondary layer coating device 40 , a colored layer coating device 50 , guide rollers 60 , 61 , 62 , a bobbin 70 and a winding device 71 .
- the manufacturing apparatus 10 is an apparatus for manufacturing the colored optical fiber 1 from the optical fiber preform 6 .
- the optical fiber preform 6 is made of, for example, silica-based glass, and is manufactured by a known method such as the VAD method, the OVD method, the MCVD method, or the like.
- the heating device 20 has a heater 21 .
- the heater 21 can be any heat source such as tape heaters, ribbon heaters, rubber heaters, oven heaters, ceramic heaters, halogen heaters.
- the end portion of the optical fiber preform 6 is heated by a heater 21 arranged around the optical fiber preform 6 to be melted and drawn to draw out the bare optical fiber 2 .
- a primary layer coating device 30 is provided below the heating device 20 .
- the primary layer coating device 30 has a resin coating device 31 and an ultraviolet irradiation device 32 .
- a coating material for the primary layer 3 (also referred to as a first ultraviolet curable resin) is held in the resin coating device 31 .
- the bare optical fiber 2 pulled out from the optical fiber preform 6 is coated with a first ultraviolet curable resin by a resin coating device 31 .
- An ultraviolet irradiation device 32 is provided below the resin coating device 31 .
- the ultraviolet irradiation device 32 includes any ultraviolet light source such as a metal halide lamp, a mercury lamp, or a UV-LED.
- a first ultraviolet curable resin is applied to the bare optical fiber 2 by a resin coating device 31, and the bare optical fiber 2 enters an ultraviolet irradiation device 32, where the first ultraviolet curable resin is irradiated with ultraviolet rays.
- the first UV-curable resin which is mainly composed of UV-curable resin, is cured to form the primary layer 3 .
- a secondary layer coating device 40 is provided below the primary layer coating device 30 .
- the secondary layer coating device 40 has a resin coating device 41 and an ultraviolet irradiation device 42 .
- the resin coating device 41 holds a coating material (also referred to as a second ultraviolet curable resin) for the secondary layer 4 .
- the primary layer 3 is coated with a second ultraviolet curable resin by a resin coating device 41 .
- An ultraviolet irradiation device 42 is provided below the resin coating device 41 .
- the ultraviolet irradiation device 42 can have a configuration similar to that of the ultraviolet irradiation device 32 .
- the bare optical fiber 2 enters an ultraviolet irradiation device 42, and the second ultraviolet curing resin is irradiated with ultraviolet rays.
- the second UV-curable resin which is mainly composed of UV-curable resin, is cured to form the secondary layer 4 .
- the bare optical fiber 2 is guided by guide rollers 60 provided below the secondary layer coating device 40 and wound onto a bobbin 70 .
- the bare optical fiber 2 coated with the primary layer 3 and the secondary layer 4 is once wound around a bobbin, and then the colored layer 5 is formed again.
- the resin coating device 31 may be configured to separately hold the first ultraviolet curable resin and the second ultraviolet curable resin. In this case, the resin coating device 31 applies the first ultraviolet curable resin to the bare optical fiber 2, and then applies the second ultraviolet curable resin on the first ultraviolet curable resin.
- the ultraviolet irradiation device 32 irradiates the first ultraviolet-curable resin and the second ultraviolet-curable resin applied to the bare optical fiber 2 with ultraviolet rays to form the primary layer 3 and the secondary layer 4 . In this case, the manufacturing apparatus 10 does not necessarily need to have the secondary layer coating apparatus 40 .
- the bare optical fiber 2 wound around the bobbin 70 is guided by the guide rollers 61 and enters the colored layer coating device 50 .
- the colored layer coating device 50 has a resin coating device 51 and an ultraviolet irradiation device 52 .
- a coating material for the colored layer 5 (also referred to as a third ultraviolet curable resin) is held in the resin coating device 51 .
- the optical fiber bare wire 2 coated with the primary layer 3 and the secondary layer 4 is coated with a third ultraviolet curing resin by a resin coating device 51 .
- An ultraviolet irradiation device 52 is provided below the resin coating device 51 .
- the ultraviolet irradiation device 52 can be configured similarly to the ultraviolet irradiation devices 32 and 42 .
- the optical fiber bare wire 2 with the third ultraviolet curable resin applied to the outer periphery of the secondary layer 4 enters the ultraviolet irradiation device 52, and the optical fiber bare wire 2 is irradiated with ultraviolet rays.
- the third ultraviolet curable resin containing ultraviolet curable resin as a main component is cured to form the colored layer 5 .
- the primary layer 3 , the secondary layer 4 and the colored layer 5 are coated on the bare optical fiber 2 to form the colored optical fiber 1 .
- the colored optical fiber 1 is guided by a guide roller 62 provided below the colored layer coating device 50 and wound up by a winding device 71 .
- FIG. 3 is a flow chart of the manufacturing method of the optical fiber colored core wire 1 according to the first embodiment.
- the user installs the optical fiber preform 6 in the manufacturing apparatus 10 (step S101).
- the heater 21 provided in the heating device 20 heats the optical fiber preform 6 to start drawing the bare optical fiber 2 (step S102).
- the primary layer coating device 30 applies a first ultraviolet curable resin around the drawn optical fiber bare wire 2, irradiates the first ultraviolet curable resin with ultraviolet rays, and forms the primary layer 3 (step S103). .
- the secondary layer coating device 40 applies a second ultraviolet curable resin around the primary layer 3 and irradiates the second ultraviolet curable resin with ultraviolet rays to form the secondary layer 4 (step S104).
- An optical fiber strand is obtained by the above.
- the colored layer coating device 50 applies a third ultraviolet curable resin containing an ultraviolet curable resin around the secondary layer 4 and irradiates the third ultraviolet curable resin with ultraviolet rays to form the colored layer 5 . (Step S105).
- the optical fiber colored core wire 1 is obtained by coating the colored layer 5 around the optical fiber strand.
- the step of forming the primary layer 3 does not necessarily require irradiation with ultraviolet rays.
- the primary layer 3 can be cured by UV irradiation in the step of forming the secondary layer 4 (step S104) or the step of forming the colored layer 5 (step S105).
- irradiation of ultraviolet rays includes the step of forming the primary layer 3 (step S103), the step of forming the secondary layer 4 (step S104), and the step of forming the colored layer 5 (step S105). ). Therefore, after the primary layer 3 is formed, the primary layer 3 is irradiated with ultraviolet rays even in the formation of the secondary layer 4 and the colored layer 5, and the primary layer 3 can be cured. More specifically, the ultraviolet rays that have passed through the secondary layer 4 and the colored layer 5 are absorbed by the primary layer 3, and the hardening of the primary layer 3 can proceed further. If the primary layer 3 is excessively hardened, the Young's modulus of the primary layer 3 becomes high, and it becomes difficult for the primary layer 3 to sufficiently absorb the external force applied to the bare optical fiber 2 . This can result in microbend loss.
- hardening of the primary layer 3 is suppressed while the Young's modulus of the primary layer 3 is made lower than the saturated Young's modulus, thereby effectively avoiding microbend loss.
- a method for suppressing hardening of the primary layer 3 will be described below.
- the primary layer 3 is cured by polymerizing the ultraviolet curable resin contained in the first ultraviolet curable resin. Further, a part of the low-molecular-weight component contained in the first ultraviolet-curing resin volatilizes under high-temperature conditions after, for example, the drawing step (step S102).
- the first ultraviolet-curing resin By irradiating the first ultraviolet-curing resin with ultraviolet rays while the first ultraviolet-curing resin is at a high temperature, polymerization and volatilization of the first ultraviolet-curing resin proceed at the same time.
- the simultaneous progress of polymerization and volatilization of the first ultraviolet curable resin suppresses the polymerization of the first ultraviolet curable resin. That is, by irradiating the first ultraviolet curable resin with ultraviolet rays under the condition that the first ultraviolet curable resin is at a high temperature, it is possible to suppress the progress of curing of the primary layer 3 and keep the Young's modulus of the primary layer 3 low. can.
- volatilization of the first UV-curable resin changes the composition of the first UV-curable resin, thereby suppressing curing of the primary layer 3 .
- the composition of the primary layer 3 is changed so that the progress of curing is suppressed. That is, even when the optical fiber colored core wire 1 is irradiated with additional ultraviolet rays, the hardening of the primary layer 3 can be suppressed.
- As a method of increasing the temperature of the first ultraviolet curable resin for example, shortening the period from the end of the drawing step (step S102) to the start of the step of covering the primary layer 3 (step S103). In this case, since the first ultraviolet curable resin is applied around the bare optical fiber 2 at a relatively high temperature, the first ultraviolet curable resin is irradiated with ultraviolet rays while the first ultraviolet curable resin is at a high temperature. be able to.
- the method of suppressing the progress of hardening of the primary layer 3 is not limited to the method of heating the first ultraviolet curable resin to a high temperature.
- Other methods include, for example, a method of adjusting the amount of additives contained in the first ultraviolet-curing resin, a method of adjusting the amount of ultraviolet rays to be irradiated, and the like. By arbitrarily selecting or combining these methods, settings can be appropriately made so as to obtain the primary layer 3 having the required Young's modulus.
- the Young's modulus of the primary layer 3 is desirably set to less than 70% with respect to the saturated Young's modulus.
- an optical fiber ribbon made up of the colored optical fiber core wire according to the first embodiment will be described.
- the application example of the colored optical fiber core wire according to the first embodiment is not limited to the form of an optical fiber ribbon. and may take the form of a fiber optic ribbon cable in which the fiber optic ribbon is enclosed by a sheath.
- FIG. 4 is a cross-sectional view of the optical fiber ribbon 100 according to the second embodiment.
- the optical fiber ribbon 100 is configured by bundling a plurality of colored optical fiber core wires 1 into a belt shape with an adhesive layer 101 interposed therebetween.
- the adhesive layer 101 is formed by curing a coating material containing an ultraviolet curable resin by irradiating it with ultraviolet rays.
- the ultraviolet curable resin forming the adhesive layer 101 is composed of the same resin as the ultraviolet curable resin forming the primary layer 3 , the secondary layer 4 and the colored layer 5 .
- the colored optical fiber core wires 1 can be bundled at a high density.
- the optical fiber ribbon 100 is not limited to the configuration shown in FIG. Further, it may take the form of an optical fiber ribbon cable in which the optical fiber ribbon 100 is accommodated by a sheath, or may take an intermittent bonding structure in which the colored optical fiber core wire 1 is intermittently bonded in the longitudinal direction.
- FIG. 5 is a schematic diagram of a ribbon forming apparatus 80 used in the method for manufacturing the optical fiber ribbon 100 according to the second embodiment.
- the ribbon forming device 80 holds the coating material of the adhesive layer 101 (also referred to as a fourth ultraviolet curable resin).
- the ribboning device 80 is also provided with an ultraviolet light source similar to the ultraviolet light sources provided in the ultraviolet irradiation devices 32 , 42 and 52 .
- a plurality of prepared colored optical fiber core wires 1 enter a ribbon forming device 80 and are coated with a fourth ultraviolet curable resin.
- the colored optical fiber cord 1 coated with the fourth ultraviolet curable resin is bundled together with a plurality of other colored optical fiber cords 1 coated with the fourth ultraviolet curable resin.
- the plurality of bundled colored optical fibers 1 are irradiated with ultraviolet light from an ultraviolet light source provided in the ribbon forming device 80 .
- the fourth UV-curable resin which is mainly composed of UV-curable resin, is cured to form the adhesive layer 101 .
- a plurality of colored optical fiber core wires 1 arranged in parallel are connected via an adhesive layer 101 .
- the optical fiber ribbon 100 is formed from the colored optical fiber core wire 1 .
- FIG. 6 is a flow chart of the method for manufacturing the optical fiber ribbon 100 according to the second embodiment. Steps S101 to S105 are the same as in the first embodiment.
- a step of ribbonizing the colored optical fiber 1 is performed. That is, after the colored layer 5 is formed in step S105, the ribbon forming device 80 applies the fourth ultraviolet curable resin to the plurality of prepared optical fiber colored core wires 1, and irradiates the fourth ultraviolet curable resin with ultraviolet rays. to connect a plurality of colored optical fibers 1 (step S106). Thereby, the optical fiber ribbon 100 is manufactured.
- the colored optical fiber core wire 1 is irradiated with ultraviolet rays. Further, the colored optical fiber 1 can suppress the hardening of the primary layer 3 even when additional UV irradiation is performed after manufacturing. Therefore, hardening of the primary layer 3 due to irradiation with ultraviolet rays can be suppressed even in the ribbon-forming process of the colored optical fiber 1 . Therefore, it is possible to prevent the primary layer 3 from being ultraviolet-cured to near the saturation Young's modulus, and obtain the optical fiber ribbon 100 including the primary layer 3 having a sufficiently low Young's modulus.
- Table 1 shows the evaluation of the Young's modulus of the primary layer and the microbend loss in the examples and comparative examples of the colored optical fiber or optical fiber ribbon. That is, Table 1 shows the saturated Young's modulus (MPa), Young's modulus (MPa), Young's modulus/saturated Young's modulus (%), and Young's modulus after additional UV irradiation of the primary layer in Examples 1 to 6 and Comparative Examples 1 to 4.
- microbend loss As a value.
- the transmission loss of the optical fiber in state B does not include the microbend loss, and is considered to be the transmission loss inherent in the optical fiber itself.
- This measuring method is similar to the fixed diameter drum method specified in JIS C6823:2010. This measurement method is also called a sandpaper method. In this measurement method, the transmission loss is measured at a wavelength of 1550 nm, so the microbend loss below is also the value at the wavelength of 1550 nm.
- an effective core cross-sectional area can be used as an indicator of the likelihood of occurrence of microbend loss in an optical fiber.
- the effective core cross-sectional area is represented by the following formula (1).
- (Effective core cross-sectional area) ( ⁇ k/4)*(MFD) 2 (Formula 1)
- the effective core area is a value at a wavelength of 1550 nm
- MFD is a mode field diameter ( ⁇ m)
- k is a constant.
- the effective core cross-sectional area represents the area of the portion of the cross section orthogonal to the axis of the bare optical fiber 2 through which light having a predetermined intensity passes.
- the colored optical fiber core wire 1 has the primary layer 3 capable of effectively buffering the external force applied to the colored optical fiber core wire 1 . Therefore, the external force applied to the bare optical fiber 2 can be sufficiently reduced by sufficiently buffering the external force applied to the colored optical fiber 1 by the primary layer 3 . As a result, even when the effective core area of the bare optical fiber 2 is large, the microbend loss of the optical fiber can be effectively suppressed.
- the colored optical fibers 1 of Examples 1 to 6 and Comparative Examples 1 to 4 preferably have an effective core cross-sectional area of 100 ⁇ m 2 or more and 160 ⁇ m 2 or less, for example, 120 ⁇ m 2 or more and 160 ⁇ m 2 or less. As a result, the colored optical fiber 1 capable of suppressing the nonlinear optical effect caused by the light in the bare optical fiber 2 can be obtained.
- the “saturated Young's modulus” in Table 1 is the Young's modulus when the first ultraviolet curable resin is formed into a film and completely cured by irradiating ultraviolet rays using a mercury lamp, UV-LED, etc. at room temperature. be.
- Young's modulus in Table 1 is the ISM (In Situ Modulus) of the colored optical fiber 1 or the primary layer 3 of the optical fiber ribbon 100 .
- ISM In situ Modulus
- the primary layer and secondary layer in the middle portion of the sample optical fiber were stripped by a length of several millimeters, and then one end of the optical fiber with the coating layer formed thereon was attached with an adhesive.
- a load F is applied to the other end of the optical fiber on which the coating layer is formed while being fixed on the slide glass.
- the displacement .delta. of the primary layer at the boundary between the portion where the coating layer is stripped off and the portion where the coating is formed is read with a microscope.
- a graph of displacement ⁇ versus load F is created by setting the load F to 10, 20, 30, 50 and 70 gf (ie 98, 196, 294, 490 and 686 mN sequentially).
- the primary elastic modulus is calculated using the slope obtained from the graph and the following formula (2). Since the calculated primary elastic modulus corresponds to the so-called ISM, it is hereinafter appropriately referred to as P-ISM.
- P-ISM the drawing speed and the illuminance of ultraviolet rays were controlled in order to adjust the P-ISM.
- the unit of P-ISM is [MPa].
- F/ ⁇ is the slope indicated by the graph of displacement ( ⁇ ) [ ⁇ m] against load (F) [gf]
- l is the sample length (for example, 10 mm)
- DP/DG is the outer diameter of the primary layer (DP) [ ⁇ m ] and the outer diameter (DG) [ ⁇ m] of the clad portion of the optical fiber. Therefore, when calculating P-ISM using the above formula from the used F, ⁇ , and l, it is necessary to perform a predetermined unit conversion.
- the outer diameter of the primary layer and the outer diameter of the clad portion can be measured by observing the cross section of the optical fiber cut by the fiber cutter with a microscope.
- “Young's modulus after additional UV irradiation” in Table 1 means that the colored core wire 1 or optical fiber ribbon after production is additionally irradiated with ultraviolet rays at 1000 mW/cm 2 and 500 mJ/cm 2 using a D bulb.
- “Young's modulus change” is the value of the amount of change from "Young's modulus” to "Young's modulus after additional UV irradiation”.
- Evaluation 1 indicates whether or not the adhesion between the bare optical fiber 2 and the primary layer 3 is maintained when a load of 70 gf is applied to the primary layer 3 during ISM measurement. If the primary layer 3 is held by the optical fiber bare wire 2 when a load of 70 gf is applied to the primary layer 3, evaluation 1 is judged to be good (OK), and the primary layer 3 is separated from the optical fiber bare wire 2. Evaluation 1 is judged to be defective (NG). Evaluation 1 can be used as an index for determining whether the primary layer 3 can hold the bare optical fiber 2 at least.
- Evaluation 2 indicates whether the microbend loss in the colored optical fiber 1 or the optical fiber ribbon 100 before additional irradiation with ultraviolet rays satisfies the standard (0.15 dB/km or less).
- Evaluation 3 indicates whether or not the microbend loss in the colored optical fiber 1 or the optical fiber ribbon 100 after additional irradiation with ultraviolet rays satisfies the standard (0.15 dB/km or less). .
- Evaluations 2 and 3 are judged to be good (OK) when the microbend loss meets the criteria, and evaluations 2 and 3 are judged to be bad (NG) when the microbend loss does not meet the criteria.
- “Curing speed” in Table 1 represents the ratio of the Young's modulus to the saturated Young's modulus when the first ultraviolet curable resin is formed into a film and cured at room temperature at 50 mJ/cm 2 using a mercury lamp. A value between 0 and 1.
- Example 1 the first ultraviolet curable resin with a saturated Young's modulus of 0.85 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 1 reaches 0.54 MPa, and the ratio of Young's modulus to the saturated Young's modulus is 63.5%, and the ratio is 38% or more and less than 70%. Met.
- the Young's modulus after the additional UV irradiation was 0.55 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 64.7%.
- the ratio of Young's modulus change to saturated Young's modulus was 1.2%, and the ratio was less than 27%.
- the cure speed was 0.84.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- Example 2 the first UV curable resin with a saturated Young's modulus of 0.79 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 2 reaches 0.54 MPa, the ratio of Young's modulus to the saturated Young's modulus is 68.4%, and the ratio is 38% or more and less than 70%. Met.
- the Young's modulus after the additional UV irradiation was 0.55 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 69.6%.
- the ratio of Young's modulus change to saturated Young's modulus was 1.3%, and the ratio was less than 27%.
- the cure rate was 0.82.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- Example 3 the first UV curable resin with a saturated Young's modulus of 0.75 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 3 reaches 0.29 MPa, and the ratio of Young's modulus to the saturated Young's modulus is 38.8%, and the ratio is 38% or more and less than 70%.
- Met The Young's modulus after the additional UV irradiation was 0.49 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 65.6%.
- the ratio of Young's modulus change to saturated Young's modulus was 26.8%, and the ratio was less than 27%.
- the cure speed was 0.33.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- Example 4 the first UV curable resin with a saturated Young's modulus of 0.51 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 4 reaches 0.33 MPa, and the ratio of Young's modulus to the saturated Young's modulus is 64.3%, and the ratio is 38% or more and less than 70%. Met.
- the Young's modulus after the additional UV irradiation was 0.35 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 68.2%.
- the ratio of Young's modulus change to saturated Young's modulus was 3.9%, and the ratio was less than 27%.
- the cure rate was 0.83.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- Example 5 the first UV curable resin with a saturated Young's modulus of 0.35 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 5 reaches 0.21 MPa, and the ratio of Young's modulus to the saturated Young's modulus is 59.9%, and the ratio is 38% or more and less than 70%. Met.
- the Young's modulus after the additional UV irradiation was 0.22 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 62.7%.
- the ratio of Young's modulus change to saturated Young's modulus was 2.9%, and the ratio was less than 27%.
- the cure rate was 0.75.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- Example 6 the first UV curable resin with a saturated Young's modulus of 0.30 MPa was used.
- the first UV curable resin is UV cured until the Young's modulus of Example 6 reaches 0.13 MPa, and the ratio of Young's modulus to the saturated Young's modulus is 43.4%, which is 38% or more and less than 70%. Met.
- the Young's modulus after the additional UV irradiation was 0.19 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 63.4%.
- the ratio of Young's modulus change to saturated Young's modulus was 20.0% and the ratio was less than 27%.
- the cure speed was 0.67.
- the primary layer 3 When a load was applied to the primary layer 3, the primary layer 3 was held by the bare optical fiber 2, and the evaluation 1 was good (OK).
- the microbend loss before and after the additional ultraviolet irradiation was 0.15 dB/km or less, and both evaluations 2 and 3 were good (OK).
- the first UV curable resin with a saturated Young's modulus of 1.30 MPa was used.
- the first UV-curable resin was UV-cured until the Young's modulus of Comparative Example 1 reached 0.95 MPa, and the ratio of Young's modulus to the saturated Young's modulus was 73.3%.
- the Young's modulus after the additional UV irradiation was 1.29 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 99.1%.
- the ratio of Young's modulus change to saturated Young's modulus was 25.8% and the cure rate was 0.53.
- the first UV curable resin with a saturated Young's modulus of 0.71 MPa was used.
- the first UV-curable resin was UV-cured until the Young's modulus of Comparative Example 2 reached 0.25 MPa, and the ratio of Young's modulus to the saturated Young's modulus was 35.0%.
- the Young's modulus after the additional UV irradiation was 0.52 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 73.3%.
- the ratio of Young's modulus change to saturated Young's modulus was 38.3% and the cure rate was 0.23.
- the first ultraviolet curable resin with a saturated Young's modulus of 0.40 MPa was used.
- the first UV-curable resin was UV-cured until the Young's modulus of Comparative Example 3 reached 0.12 MPa, and the ratio of the Young's modulus to the saturated Young's modulus was 30.0%.
- the Young's modulus after the additional UV irradiation was 0.36 MPa, and the ratio of the Young's modulus after the additional UV irradiation to the saturation Young's modulus was 90.0%.
- the ratio of Young's modulus change to saturated Young's modulus was 60.0% and the cure rate was 0.60.
- Comparative Example 4 the first UV curable resin with a saturated Young's modulus of 0.30 MPa was used.
- the first UV-curable resin was UV-cured until the Young's modulus of Comparative Example 4 reached 0.08 MPa, and the ratio of Young's modulus to the saturated Young's modulus was 26.7%.
- the cure speed was 0.67.
- the primary layer 3 was separated from the bare optical fiber 2, and the evaluation 1 was NG (defective).
- FIG. 7 is an example of a diagram showing the relationship between the ratio (%) of Young's modulus to the saturation Young's modulus, the ratio (%) of Young's modulus after additional UV irradiation to the saturation Young's modulus, and microbend loss (dB/km). be.
- the ratio of Young's modulus to saturation Young's modulus is less than 70%, the microbend loss of the colored optical fiber 1 is 0.15 dB/km or less. . Therefore, it is preferred that the ratio of Young's modulus to saturation Young's modulus is less than 70%.
- the primary layer 3 preferably has a relatively low saturation Young's modulus of, for example, 0.85 MPa or less. Thereby, a primary layer 3 having a sufficiently low Young's modulus can be obtained.
- the ratio of Young's modulus to saturated Young's modulus is preferably 38% or more and less than 70%.
- the primary layer 3 is exposed to high temperatures in the drawing process, the curing reaction due to additional UV irradiation can be suppressed. As a result, the hardening of the primary layer 3 is suppressed, and the hardening of the primary layer 3 to near the saturation Young's modulus can be prevented.
- the ratio of the Young's modulus after additional UV irradiation to the saturated Young's modulus is less than 70%, the ratio of the change in Young's modulus before and after additional UV irradiation to the saturated Young's modulus is less than 27%, and the curing speed is 0 0.33 or more is preferable.
- the manufactured colored optical fiber 1 or optical fiber ribbon 100 is irradiated with additional ultraviolet rays, it is possible to suppress microbend loss due to hardening of the primary layer 3 .
- optical fiber colored core wire optical fiber bare wire 3 primary layer 4 secondary layer 5 colored layer
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Abstract
Description
図1は、第1実施形態に係る光ファイバ着色心線1の断面図である。光ファイバ着色心線1は、光ファイバ裸線2と、光ファイバ裸線2の外周に被膜されたプライマリ層3と、プライマリ層3の外周に被覆されたセカンダリ層4と、セカンダリ層4の外周に被覆された着色層5とを備える。光ファイバ裸線2は、プライマリ層3、セカンダリ層4及び着色層5の3層の被覆層により被覆される。着色層5が形成される前のファイバは光ファイバ素線と称される。
本発明の第2実施形態による光ファイバリボン、光ファイバリボンの製造装置及び製造方法について説明する。第1実施形態による光ファイバ着色心線1、光ファイバ着色心線1の製造装置10及び製造方法と同様の構成要素には同一の符号を付し、説明を省略し或いは簡潔にする。
(有効コア断面積)=(πk/4)*(MFD)2 ・・・(式1)
ここで、有効コア断面積は、波長1550nmにおける値であり、MFDはモードフィールド径(μm)、kは定数である。有効コア断面積は、光ファイバ裸線2の軸に直交する断面のうち、所定の強度を有する光が通過する部分の面積を表す。一般的に、光ファイバ裸線2の有効コア断面積が大きくなるほど、光ファイバ裸線2の断面における光学的閉じ込めが弱くなる。すなわち、光ファイバ裸線2の有効コア断面積が大きい場合、光ファイバ裸線2に加わる外力によって光ファイバ裸線2内の光が漏出しやすくなる。このため、光ファイバ裸線2の有効コア断面積が大きくなると、光ファイバ着色心線1のマイクロベンドロスが生じやすくなる。
P-ISM=(3F/δ)*(1/2πl)*ln(DP/DG) ・・・(式2)
2 光ファイバ裸線
3 プライマリ層
4 セカンダリ層
5 着色層
Claims (15)
- 光ファイバ裸線と、
前記光ファイバ裸線を覆う第1紫外線硬化型樹脂により形成されたプライマリ層と、
前記プライマリ層を覆う第2紫外線硬化型樹脂により形成されたセカンダリ層と、
を備え、
前記プライマリ層のヤング率が前記プライマリ層の飽和ヤング率に対して70%未満であり、
前記プライマリ層の飽和ヤング率が0.85MPa以下であることを特徴とする光ファイバ着色心線。 - 前記プライマリ層のヤング率が前記プライマリ層の飽和ヤング率に対して38%以上であることを特徴とする請求項1に記載の光ファイバ着色心線。
- 前記プライマリ層のヤング率が0.13MPa以上、0.60MPa以下であることを特徴とする請求項1または2に記載の光ファイバ着色心線。
- 前記プライマリ層に紫外線を追加照射した後のヤング率が前記プライマリ層の飽和ヤング率に対して70%未満であることを特徴とする請求項1乃至3のいずれか1項に記載の光ファイバ着色心線。
- 前記プライマリ層に紫外線を照射する前後におけるヤング率の変化量が、前記プライマリ層の飽和ヤング率に対して27%未満であることを特徴とする請求項1乃至4のいずれか1項に記載の光ファイバ着色心線。
- 前記光ファイバ裸線の軸に平行な方向で70gfの荷重を前記プライマリ層に加えた際、前記光ファイバ裸線と前記プライマリ層との密着が保持されることを特徴とする請求項1乃至5のいずれか1項に記載の光ファイバ着色心線。
- 前記第1紫外線硬化型樹脂は、50mJ/cm2の紫外線の照射によって、飽和ヤング率に対して33%以上のヤング率まで紫外線硬化されることを特徴とする請求項1乃至6のいずれか1項に記載の光ファイバ着色心線。
- 請求項1乃至7のいずれか1項に記載の複数の光ファイバ着色心線を備え、
前記複数の光ファイバ着色心線を連結する接着層を備えることを特徴とする光ファイバリボン。 - 請求項1乃至7のいずれか1項に記載の複数の光ファイバ着色心線を備え、
前記複数の光ファイバ着色心線を内部に収容するシースを備えることを特徴とする単心ファイバの集合体ケーブル。 - 請求項8に記載の光ファイバリボンと、
前記光ファイバリボンを収容するシースとを備えることを特徴とする光ファイバリボンケーブル。 - 光ファイバ母材から光ファイバ裸線を線引きする工程と、
前記光ファイバ裸線の周囲に第1紫外線硬化型樹脂を塗布し、プライマリ層を形成する工程と、
前記プライマリ層の周囲に第2紫外線硬化型樹脂を塗布し、前記第2紫外線硬化型樹脂に紫外線を照射してセカンダリ層を形成する工程とを備えた光ファイバ着色心線の製造方法であって、
前記光ファイバ着色心線の製造後において、
前記プライマリ層のヤング率が、前記プライマリ層の飽和ヤング率に対して70%未満であり、
前記プライマリ層の飽和ヤング率が0.85MPa以下であることを特徴とする光ファイバ着色心線の製造方法。 - 前記プライマリ層を形成する工程において、前記第1紫外線硬化型樹脂に紫外線を照射することを特徴とする請求項11に記載の光ファイバ着色心線の製造方法。
- 前記セカンダリ層の周囲に第3紫外線硬化型樹脂を塗布し、前記第3紫外線硬化型樹脂に紫外線を照射して着色層を形成する工程をさらに備えることを特徴とする請求項11または12に記載の光ファイバ着色心線の製造方法。
- 前記セカンダリ層が着色されることを特徴とする請求項11または12に記載の光ファイバ着色心線の製造方法。
- 請求項11乃至14のいずれか1項に記載の光ファイバ着色心線を複数用意する工程と、
前記複数の光ファイバ着色心線に第4紫外線硬化型樹脂を塗布し、前記第4紫外線硬化型樹脂に紫外線を照射して前記複数の光ファイバ着色心線を連結する工程とを備えることを特徴とする光ファイバリボンの製造方法。
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