CN105676344B - Optical fiber, optical cable, communication device, and lighting fixture - Google Patents
Optical fiber, optical cable, communication device, and lighting fixture Download PDFInfo
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- CN105676344B CN105676344B CN201510809824.8A CN201510809824A CN105676344B CN 105676344 B CN105676344 B CN 105676344B CN 201510809824 A CN201510809824 A CN 201510809824A CN 105676344 B CN105676344 B CN 105676344B
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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
- G02B6/02033—Core or cladding made from organic material, e.g. polymeric material
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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
- G02B6/02042—Multicore optical fibres
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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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The present invention relates to an optical fiber, an optical cable, a communication device, and a lighting fixture, and provides an optical fiber having heat resistance, low transmission loss, and excellent bendability. The optical fiber has a core and at least 1 sheath, wherein the sheath is made of a material containing a fluorine-based resin, the fluorine-based resin contains at least 1 selected from the group consisting of vinylidene fluoride units, tetrafluoroethylene units and hexafluoropropylene units, and the chromaticity coordinate x of light leaking from the side surface when light is transmitted from a halogen lamp is set to x not more than 0.34.
Description
Technical Field
The invention relates to an optical fiber, an optical cable, a communication apparatus, and a lighting fixture.
Background
Optical fibers are used in a wide variety of applications such as optical transmission, lighting equipment, decoration, and displays. Glass-based optical fibers have excellent optical transmission properties over a wide wavelength range, and have problems such as poor processability and poor mechanical properties. On the other hand, the plastic optical fiber has a structure in which the outer periphery of a core made of a highly transparent resin such as polymethyl methacrylate is covered with a sheath made of a resin having a lower refractive index than the core and having high transparency. Therefore, it has characteristics such as flexibility and processability superior to those of glass-based optical fibers.
As a material constituting the sheath, a fluorine-based resin containing a vinylidene fluoride unit and a fluorinated alkyl methacrylate unit is often used in view of excellent transparency, moist heat resistance, mechanical properties, and adhesion to polymethyl methacrylate and having a lower refractive index than polymethyl methacrylate.
For example, patent document 1 discloses a plastic optical fiber using a fluorine resin containing vinylidene fluoride units, tetrafluoroethylene units, and hexafluoropropylene units as a material constituting a sheath. Patent document 2 discloses a plastic optical fiber using a fluorine-based resin containing a fluorinated alkyl methacrylate unit as a material constituting a sheath.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 11-095044
Patent document 2: japanese laid-open patent publication No. 2002-105134
Disclosure of Invention
Problems to be solved by the invention
The fluororesin disclosed in patent document 1, which contains vinylidene fluoride units, tetrafluoroethylene units and hexafluoropropylene units, generally contains sulfur atoms. It has been found through studies by the present inventors that if a large amount of sulfur atoms is contained, the transmission loss of the optical fiber, particularly the transmission loss of the optical fiber in the short wavelength region of 400nm to 600nm, is significantly increased.
Further, the fluorine-based resin containing a fluorinated alkyl methacrylate unit disclosed in patent document 2 is hard and therefore is liable to crack, and this crack causes light leakage in the optical fiber and may increase the transmission loss.
Accordingly, an object of the present invention is to provide an optical fiber having heat resistance, low transmission loss, and excellent bendability.
Means for solving the problems
The present invention relates to an optical fiber having a core and at least 1 sheath, wherein the material constituting the sheath comprises a fluorine-based resin, the fluorine-based resin comprises at least 1 selected from the group consisting of vinylidene fluoride units, tetrafluoroethylene units and hexafluoropropylene units, and the chromaticity coordinate x of light leaking from the side surface when light is transmitted using a halogen lamp as a light source is set to x.ltoreq.0.34.
The present invention also relates to an optical cable having a coating layer on the outer periphery of the optical fiber.
Further, the present invention relates to a communication apparatus and a lighting fixture including the above optical fiber.
ADVANTAGEOUS EFFECTS OF INVENTION
The optical fiber of the present invention is heat resistant, has low transmission loss, and is excellent in bendability.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of a step-index type optical fiber as an example of an optical fiber of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of a multi-core optical fiber as an example of the optical fiber of the present invention.
Description of the symbols
10 optical fiber
11 core
12 sheath
12a sheath (innermost layer)
12b sheath (outermost layer)
12c sheath (sea).
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the configurations shown in these drawings.
(optical fiber)
The optical fiber of the present invention has a core and a sheath composed of at least 1 layer surrounding the outer periphery of the core. Examples of the type of the optical fiber include a step-index optical fiber, a multimode step-index optical fiber, a graded-index optical fiber, and a multicore optical fiber. Among these optical fibers, a step-index optical fiber is preferable because it is thermally stable, easy and inexpensive to manufacture, and capable of realizing communication over a longer distance.
The step-index optical fiber totally reflects light at an interface between a core and a sheath and propagates the light in the core.
Fig. 1 shows a cross-sectional structure of an example of a step-index optical fiber 10. Fig. 1(a) shows a case where the sheath is composed of 1 layer, and the sheath 12 surrounds the outer periphery of the core 11. Fig. 1(b) shows a case where the sheath is composed of 2 layers, and the innermost sheath 12a surrounds the outer periphery of the core 11, and the outermost sheath 12b surrounds the outer periphery of the innermost sheath 12 a.
The multi-core optical fiber totally reflects light at an interface between a core and a sheath and propagates light in a plurality of cores.
Fig. 2 shows a cross-sectional structure of an example of the multicore fiber. In the example shown in fig. 2(a), 1 sheath (sea) 12c surrounds the plurality of cores 11 to form a multi-core optical fiber. In the example shown in fig. 2(b), the plurality of cores 11 each have a sheath 12 on the outer periphery thereof, and further 1 sheath (sea portion) 12c surrounds the plurality of sheaths 12 to constitute a multi-core optical fiber.
(core)
The material (core material) constituting the core is not particularly limited as long as it is a resin having high transparency, and may be appropriately selected depending on the purpose of use and the like.
Examples of the resin having high transparency include acrylic resins, styrene resins, and carbonate resins. These resins may be used alone in 1 kind, or may be used in combination in 2 or more kinds. Among these resins, acrylic resins are preferable from the viewpoint of reducing the transmission loss of the optical fiber.
Examples of the acrylic resin include a methyl methacrylate homopolymer (PMMA), a copolymer containing 50 mass% or more of a methyl methacrylate unit (methyl methacrylate copolymer), and the like. These acrylic resins may be used alone in 1 kind, or may be used in combination in 2 or more kinds. Of these acrylic resins, methyl methacrylate homopolymers and copolymers containing 50 mass% or more of methyl methacrylate units are preferable in terms of excellent optical properties, mechanical properties, heat resistance and transparency. The methyl methacrylate copolymer is preferably a copolymer containing 60 mass% or more of methyl methacrylate units, and more preferably a copolymer containing 70 mass% or more of methyl methacrylate units. It is particularly preferred that the core material is a methyl methacrylate homopolymer.
The core material can be produced by a known polymerization method. Examples of the polymerization method for producing the core material include a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, a solution polymerization method, and the like. Among these polymerization methods, the bulk polymerization method or the solution polymerization method is preferable from the viewpoint of suppressing the incorporation of foreign substances.
(sheath)
The sheath forms at least 1 layer at the periphery of the core. The sheath may be formed of 1 layer as shown in fig. 1(a), or may be formed of 2 or more layers as shown in fig. 1 (b). From the viewpoint of reducing light attenuation, the sheath is preferably 1 to 3 layers. Further, the sheath is more preferably 1 layer in view of simplification of the manufacturing equipment and excellent productivity.
The material (sheath material) constituting the sheath is a fluorine-based resin containing at least 1 selected from the group consisting of a vinylidene fluoride (VDF) unit, a Tetrafluoroethylene (TFE) unit, and a Hexafluoropropylene (HFP) unit.
By using the fluorine-based resin as the sheath material, the attenuation of light at the interface between the core and the sheath can be reduced. As a result, the transmission loss is reduced, and the flexibility is high, and the sheath is less likely to crack, so that an optical fiber having excellent heat resistance and bendability can be obtained.
When the sheath is composed of 2 or more layers, at least the outermost layer (for example, 12b in fig. 1 (b)) is preferably composed of the above-mentioned fluororesin, and more preferably, the entire layers of the sheath are composed of the above-mentioned fluororesin.
Examples of the fluorine-based resin include a VDF homopolymer, a VDF/TFE copolymer, a VDF/TFE/HFP copolymer, a VDF/TFE/HFP/(perfluoro) alkyl vinyl ether copolymer, a VDF/hexafluoroacetone copolymer, a VDF/TFE/hexafluoroacetone copolymer, an ethylene/VDF/TFE/HFP copolymer, an ethylene/TFE/HFP copolymer, and a VDF/trifluoroethylene copolymer. These fluorine-based resins may be used alone in 1 kind, or 2 or more kinds may be used in combination. Among these fluorine-based resins, VDF/TFE copolymers, VDF/TFE/HFP copolymers, VDF/HFP copolymers, ethylene/VDF/TFE/HFP copolymers, and ethylene/TFE/HFP copolymers are preferable, and VDF/TFE/HFP copolymers, and VDF/HFP copolymers are more preferable, from the viewpoint of excellent flexibility, impact resistance, transparency, and chemical resistance, and low price.
The content ratio of the VDF unit, the TFE unit, and the HFP unit in total is preferably 50 to 100 mass%, more preferably 70 to 100 mass% of the fluorine-based resin in terms of excellent bendability.
In the case of using a VDF/TFE copolymer as the fluorine-based resin from the viewpoint of processability and reduction in transmission loss of the optical fiber, the VDF unit is preferably 65 to 85 mass%, the TFE unit is preferably 15 to 35 mass%, the VDF unit is more preferably 77 to 83 mass%, and the TFE unit is preferably 17 to 23 mass% in 100 mass% of the copolymer.
In view of processability and reduction in transmission loss of an optical fiber, when a VDF/HFP copolymer is used as the fluorine-based resin, the VDF unit is preferably 70 to 90 mass%, the HFP unit is preferably 10 to 30 mass%, the VDF unit is more preferably 82 to 88 mass%, and the HFP unit is 12 to 18 mass% in 100 mass% of the copolymer.
The fluorine-based resin can be produced by a known method.
(color coordinates)
The chromaticity coordinate x of the light leaking from the side surface when the light is transmitted by using the halogen lamp as the light source of the optical fiber of the invention is x less than or equal to 0.34, preferably x less than or equal to 0.31. The chromaticity coordinate x can be adjusted to the above range by adjusting the content of the sulfur atom in the fluorine-based resin, for example.
In the present specification, chromaticity coordinate x is defined as: the value of the wavelength spectrum of light which is transmitted to an optical fiber using a halogen lamp as a light source and leaks from the side surface of the optical fiber was measured using a spectral photometer, and the value calculated in accordance with JIS Z8701-1995 was calculated from the obtained value of the wavelength spectrum.
The X-ray intensity derived from sulfur in the fluorine-based resin is preferably 0.6kcps or less, more preferably 0.5kcps or less, further preferably 0.4kcps or less, and particularly preferably 0.3kcps or less, from the viewpoint of reducing the attenuation of light at the interface between the core and the sheath and reducing the transmission loss of the optical fiber.
In the present specification, the X-ray intensity of the sulfur element source is defined as: the obtained value was measured by fluorescent X-ray analysis in accordance with JIS K0119.
The content of sulfur atoms in the fluorine-based resin is preferably 50ppm or less, more preferably 40ppm or less, further preferably 30ppm or less, and particularly preferably 20ppm or less, from the viewpoints of obtaining chromaticity coordinates within the above range, reducing the attenuation of light at the interface between the core and the sheath, and reducing the transmission loss of the optical fiber.
In the present specification, the content of sulfur atoms is defined as: a value calculated from the value of the X-ray intensity.
The refractive index of the core material and the sheath material is not particularly limited as long as the refractive index of the sheath material is lower than that of the core material. From the viewpoint of increasing the numerical aperture relative to the maximum angle at which light can propagate, the refractive index of the core material is preferably 1.45 to 1.55 and the refractive index of the sheath material is 1.35 to 1.51, more preferably the refractive index of the core material is 1.46 to 1.53 and the refractive index of the sheath material is 1.37 to 1.49, still more preferably the refractive index of the core material is 1.47 to 1.51 and the refractive index of the sheath material is 1.39 to 1.47.
In the present specification, the refractive index is: the values obtained were determined at 25 ℃ using sodium D-ray.
(Molding)
The optical fiber can be molded using a known molding method. Examples of the molding method include a melt spinning method. The optical fiber formed by the melt spinning method can be formed by, for example, melting the core material and the sheath material separately and performing composite spinning.
The diameter of the optical fiber is preferably 0.01mm to 5.0mm, more preferably 0.05mm to 4.0mm, and even more preferably 0.1mm to 3.0mm, from the viewpoint of reducing the transmission loss of the optical fiber and of improving the workability of the optical fiber.
The diameter of the core with respect to the diameter of the optical fiber is preferably 70% to 99.8%, more preferably 80% to 99.4%, and even more preferably 90% to 99%, from the viewpoint of reducing the transmission loss of the optical fiber, the coupling efficiency with the optical element, and the tolerance to the optical axis shift.
The thickness of the sheath with respect to the diameter of the optical fiber is preferably 0.1% to 15%, more preferably 0.3% to 10%, and even more preferably 0.5% to 5%, from the viewpoint of reducing the transmission loss of the optical fiber, the coupling efficiency with the optical element, and the tolerance to the optical axis shift.
When the sheath is composed of 2 layers, the thicknesses of the innermost sheath (12 a in fig. 1 (b)) and the outermost sheath (12 b in fig. 1 (b)) can be appropriately set.
When the sheath is composed of 2 layers, the ratio of the thickness of the outermost layer to the thickness of the innermost layer is preferably 0.5 to 5, more preferably 1 to 4, and even more preferably 1.2 to 3, from the viewpoint of reducing the transmission loss of the optical fiber.
(post-treatment)
From the viewpoint of improving mechanical properties, the optical fiber is preferably subjected to a heat drawing treatment. The conditions for the heat-drawing treatment may be set appropriately according to the material of the optical fiber, and may be continuous or batch-wise.
When the optical fiber is used in an environment with a large temperature difference, the optical fiber is preferably annealed to suppress the loosening. The conditions of the annealing treatment may be set as appropriate depending on the material of the optical fiber, and may be continuous or batch-wise.
In order to reduce the transmission loss of the optical fiber, the optical fiber may be subjected to a wet heat treatment or a warm water treatment. The conditions for the wet heat treatment and the hot water treatment may be set as appropriate depending on the material of the optical fiber, and may be continuous or batch-wise.
The optical fiber may be subjected to a wet heat treatment or a warm water treatment, and then dried. The conditions of the drying treatment may be set appropriately according to the material of the optical fiber, and may be continuous or batch-wise.
(Transmission loss)
The optical fiber of the present invention preferably has a transmission loss of 350dB/km or less, more preferably 300dB/km or less, as measured by a 25m-1m cut-off method using light having a wavelength of 400nm and a Numerical Aperture (NA) of 0.1.
In addition, in the present specification, the cutoff method of 25m-1m is determined in accordance with IEC 60793-1-40: 2001. Specifically, a 25m optical fiber was set in a measuring apparatus to measure the output power P2Thereafter, the optical fiber was cut to a back-cut length (1 m from the incident end), and the output power P was measured1The optical transmission loss is calculated by using the following formula (1).
[ number 1]
(maintenance ratio of quantity of light wound)
The optical fiber of the present invention is manufactured in a manner according to IEC 60794-1: in the cable bending test in 1993, the retention of the amount of light of winding is preferably 50% or more, more preferably 70% or more when the cylinder has a diameter of 10mm and is wound several times 10 times.
In addition, in the present specification, the cable bending test is performed in accordance with IEC 60794-1: 1993. Specifically, a 10m optical fiber was set in a measuring apparatus to measure the output power P3Thereafter, the optical fiber was gradually wound around a cylinder having a diameter of 10mm 10 times at the same speed, and the output P was measured4The light quantity retention rate is calculated by using the following formula (2).
Wrap light quantity retention (%) - (P)3/P4)×100 (2)
(coating layer)
The optical fiber of the present invention can be used as an optical cable by providing a coating layer on the outer circumference as required.
Examples of the material constituting the coating layer include olefin resins such as polyethylene resins and polypropylene resins; chlorine resins such as vinyl chloride resins and chlorinated polyethylene resins; a fluororesin; a urethane resin; a styrene resin; polyamide resins, and the like. These materials constituting the coating layer may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The coating layer may be 1 layer or 2 or more layers.
(use)
The optical fiber of the present invention is heat-resistant, has low transmission loss and excellent flexibility, and therefore can be used for, for example, communication equipment, lighting equipment, decorations, displays, and the like, and is particularly suitable for use in communication equipment.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
(X-ray intensity of sulfur source)
The X-ray intensity of the sulfur source was measured for the fluorine-based resins constituting the sheath materials used in the examples and comparative examples. Specifically, according to JIS K0119, a fluorine-based resin dried in vacuum was press-molded at 25 ℃ to prepare a sample, and the X-ray intensity of a sulfur source was measured by fluorescent X-ray analysis (machine type name "ZSX 100 e", manufactured by Shikoku corporation).
The range to be measured is Na (sodium) to U (uranium) in the periodic table.
(content of sulfur atom)
The content of sulfur atoms in the fluorine-based resin constituting the sheath material used in the examples and comparative examples was calculated from the value of the X-ray intensity.
(Transmission loss)
The optical fibers obtained in examples and comparative examples were measured for transmission loss (initial transmission loss and transmission loss after dry heat treatment) before and after dry heat treatment at a temperature of 70 ℃ and a relative humidity of 10% or less for 1000 hours by a 25m-1m cut-off method using light having a wavelength of 400nm, a wavelength of 650nm, and a Numerical Aperture (NA) of 0.1.
In addition, the cut-off method of 25m-1m was determined in accordance with IEC 60793-1-40: 2001. Specifically, a 25m optical fiber was set in a measuring apparatus to measure the output power P2Thereafter, the optical fiber was cut to a back-cut length (1 m from the incident end), and the output power P was measured1The transmission loss of light is calculated by using the above equation (1).
(color coordinates)
The optical fibers obtained in examples and comparative examples were wound around a wire at 1500m, and the value of the wavelength spectrum of light leaking from the side surface of the optical fiber, which was transmitted to the optical fiber by using a halogen lamp (trade name "JCR 12V100W 10H", manufactured by kawasaki electric corporation, 12V, 100W) as a light source, was measured using a spectrophotometer (trade name "PMA-11", manufactured by hamamatsu photonics corporation). From the obtained value of the wavelength spectrum, the chromaticity coordinate x was calculated in accordance with JIS Z8701-1995.
(maintenance ratio of quantity of light wound)
With respect to the optical fibers obtained in examples and comparative examples, the optical fibers were prepared in accordance with IEC 60794-1: 1993, cable bending test to measure the amount of light retention by winding. Specifically, a 10m optical fiber was set in a measuring apparatus to measure the output power P3Thereafter, the optical fiber was gradually wound around a cylinder having a diameter of 10mm 10 times at the same speed, and the output P was measured4The light quantity retention rate is calculated by using the above formula (2).
(Material)
In examples and comparative examples, the following resins were used as the core material or the sheath material.
Resin A: PMMA (refractive index 1.49)
Resin B: VDF/TFE copolymer (molar ratio 80/20, refractive index 1.40)
Resin C: VDF/HEP copolymer (molar ratio 85/15, refractive index 1.40)
Resin D: 2- (Perfluorooctyl) ethyl methacrylate/2, 2, 2-trifluoroethyl methacrylate/methyl methacrylate/methacrylic acid copolymer (molar ratio 39/51/9/1, refractive index 1.40)
The X-ray intensity of the sulfur source and the content of sulfur atoms were different between the examples and comparative examples, and are shown in table 1.
[ example 1]
The molten resins A and B were fed to a 220 ℃ spinneret. Then, a resin A as a core material and a resin B as a sheath material (X-ray intensity of sulfur element source: 0.05kcps, content of sulfur atom: 4ppm, hereinafter referred to as resin B1) were spun using a 2-layer concentric composite spinning nozzle, and the spun fibers were drawn 2-fold in the fiber axis direction in a hot air heating furnace at 140 ℃ to obtain optical fibers having a core diameter of 990 μm, a sheath thickness of 5 μm, and a diameter of 1 mm.
The evaluation results of the obtained optical fiber are shown in table 1.
Examples 2 to 5 and comparative examples 1 to 4
Optical fibers were obtained in the same manner as in example 1, except that the resin of the sheath material was changed as shown in table 1.
The evaluation results of the obtained optical fiber are shown in table 1. In the table, all of B2 to B4, C1 to C3, D1, and D2 represent resins B, C or D, and they refer to resins having different sulfur atom contents.
[ Table 1]
As shown in table 1, it is understood that the optical fibers of the present invention obtained in examples 1 to 5 have low transmission loss and excellent bendability. Further, it is found that the transmission loss at a wavelength of 400nm at an optical time having a numerical aperture of 0.1 can be 350dB/km or less after the dry heat treatment.
On the other hand, as a result of the optical fibers obtained in comparative examples 1, 2 and 4, since the chromaticity coordinate x was outside the range of the present invention, the transmission loss was large and the thermal stability of the transmission loss was also poor. In addition, as a result of the optical fibers obtained in comparative examples 3 and 4, since the fluorine-based resin of the sheath material was out of the range of the present invention, the bendability was poor.
Industrial applicability
The optical fiber of the present invention has low transmission loss and excellent heat resistance and flexibility, and therefore can be used for, for example, communication equipment, lighting equipment, decorations, displays, and the like, and is particularly suitable for use in communication equipment.
Claims (13)
1. An optical fiber having a core and at least 1 sheath,
the material constituting the sheath contains a fluorine-based resin,
the fluorine-based resin contains at least 1 selected from the group consisting of vinylidene fluoride units, tetrafluoroethylene units and hexafluoropropylene units,
the chromaticity coordinate x of the light leaking from the side surface when the light is transmitted by using the halogen lamp as the light source is less than or equal to 0.34,
the content of sulfur atoms in the fluorine-based resin is 30ppm or less, as calculated from the value of X-ray intensity of sulfur-derived elements measured by fluorescent X-ray analysis in accordance with JIS K0119.
2. The optical fiber of claim 1, said chromaticity coordinate x being x ≦ 0.31.
3. The optical fiber according to claim 1, wherein the fluorine-based resin has an X-ray intensity of 0.6kcps or less derived from sulfur element as measured by fluorescent X-ray analysis in accordance with JIS K0119.
4. The optical fiber according to claim 1, wherein the fluorine-based resin has an X-ray intensity of 0.3kcps or less derived from sulfur element as measured by fluorescent X-ray analysis in accordance with JIS K0119.
5. The optical fiber according to claim 1, wherein a content of the sulfur atom in the fluorine-based resin is 20ppm or less.
6. The optical fiber according to claim 1, wherein the fluorine-based resin contains 70 to 90 mass% of vinylidene fluoride units and 10 to 30 mass% of hexafluoropropylene units.
7. The optical fiber according to claim 2, wherein the fluorine-based resin contains 70 to 90 mass% of vinylidene fluoride units and 10 to 30 mass% of hexafluoropropylene units.
8. The optical fiber according to claim 1, wherein the fluorine-based resin contains 82 to 88 mass% of vinylidene fluoride units and 12 to 18 mass% of hexafluoropropylene units.
9. The optical fiber according to claim 1, wherein the transmission loss measured by a 25m-1m truncation method using light having a wavelength of 400nm and a numerical aperture of 0.1 is 350dB/km or less.
10. The optical fiber of claim 1, further comprising, in a fiber according to IEC 60794-1: in the cable bending test in 1993, the retention of the amount of light to be wound is 50% or more when the diameter of the cylinder is 10mm and the cylinder is wound several times.
11. An optical cable having a coating layer on the outer periphery of the optical fiber according to any one of claims 1 to 10.
12. A communication device comprising the optical fiber of any one of claims 1 to 10.
13. A lighting device comprising the optical fiber according to any one of claims 1 to 10.
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| JP7320337B2 (en) * | 2016-11-02 | 2023-08-03 | 旭化成株式会社 | heat resistant plastic fiber optic cable |
| CN110869828A (en) * | 2017-08-31 | 2020-03-06 | 旭化成株式会社 | Plastic optical fiber, plastic optical fiber cable with connector, optical communication system, and plastic optical fiber sensor |
| CN110133797B (en) * | 2019-05-30 | 2020-07-28 | 山东光韵智能科技有限公司 | Visible light three-layer wavy-lined colorful optical fiber and manufacturing method thereof |
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| JP2000011720A (en) * | 1998-06-24 | 2000-01-14 | Mitsubishi Rayon Co Ltd | Light transmission device |
| JP2002105134A (en) * | 2000-09-27 | 2002-04-10 | Mitsubishi Rayon Co Ltd | Polymer for optical fiber sheath material, plastic optical fiber using the same, optical fiber cable and optical fiber cable with plug |
| CN102077123A (en) * | 2008-05-16 | 2011-05-25 | 3M创新有限公司 | Side lighting optical fiber |
| JP2012198424A (en) * | 2011-03-22 | 2012-10-18 | Asahi Kasei E-Materials Corp | Multi-core plastic optical fiber strand and cable |
| CN103814319A (en) * | 2011-09-14 | 2014-05-21 | 三菱丽阳株式会社 | Plastic optical fiber cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6623674B2 (en) | 2019-12-25 |
| JP2016110083A (en) | 2016-06-20 |
| CN105676344A (en) | 2016-06-15 |
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