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WO2025094697A1 - Fibre optique en plastique à âmes multiples, câble de communication optique et système de communication optique - Google Patents

Fibre optique en plastique à âmes multiples, câble de communication optique et système de communication optique Download PDF

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Publication number
WO2025094697A1
WO2025094697A1 PCT/JP2024/037112 JP2024037112W WO2025094697A1 WO 2025094697 A1 WO2025094697 A1 WO 2025094697A1 JP 2024037112 W JP2024037112 W JP 2024037112W WO 2025094697 A1 WO2025094697 A1 WO 2025094697A1
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WIPO (PCT)
Prior art keywords
core
optical fiber
plastic optical
refractive index
cladding
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Application number
PCT/JP2024/037112
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English (en)
Japanese (ja)
Inventor
暁人 伊藤
徹 岡沢
正裕 吉岡
秀和 國枝
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Toray Industries Inc
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Toray Industries Inc
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Publication of WO2025094697A1 publication Critical patent/WO2025094697A1/fr
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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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers

Definitions

  • the present invention relates to a multi-core plastic optical fiber, an optical communication cable, and an optical communication system.
  • Plastic optical fibers are lightweight and easy to bend, and are used in a wide range of fields, including decorative lighting, medical applications, in-vehicle lighting, various sensors, and communications.
  • Single-core plastic optical fiber which has one core in the fiber, has the disadvantage that bending loss occurs and the light retention rate decreases when the fiber is bent excessively.
  • multi-core plastic optical fiber which has multiple cores, can reduce the light transmission loss when the fiber is bent.
  • Patent Document 1 discloses an invention for an optical fiber sensor characterized by comprising one or more multi-core plastic optical fibers having a length of 50 cm to 5 m, which are manufactured by a composite spinning method so that 7 to 10,000 core fibers made of a transparent core resin with a high refractive index, a first sheath layer made of a transparent first sheath resin having a refractive index lower than that of the core resin and surrounding each of the core fibers, and a second sheath layer made of a second sheath resin composition in which a coloring substance is dispersed in a second sheath resin having a refractive index lower than that of the first sheath resin and surrounding the outside of each of the first sheath layers, are bundled into a fiber-like shape, a light-emitting element, and a light-receiving element.
  • Patent Document 2 also discloses an invention for a plastic optical fiber having a first sheath, a first core forming a first sea portion inside the first sheath, and a first island portion formed inside the first core, at least the outer periphery of which has a lower refractive index than the first sea portion, and the first core contains a polymethyl methacrylate resin.
  • the optical fiber described in Patent Document 1 has the problem that signal light leaks between cores (crosstalk), degrading the transmission bandwidth.
  • the optical fiber described in Patent Document 2 basically transmits signal light only through the first core, so there is an issue that the amount of information that can be sent through a single fiber is small.
  • the present invention aims to overcome the problems of the conventional technology and provide a multi-core plastic optical fiber, optical communication cable, and optical communication system with a wide transmission bandwidth.
  • the refractive index of the cladding (N2) is lower than the refractive index of the core (N1),
  • the refractive index (N3) of the sea portion is higher than the refractive index (N2) of the cladding portion.
  • Multicore plastic optical fiber (2) The multi-core plastic optical fiber according to (1) above, wherein N3 is equal to or greater than N1.
  • An optical communication cable comprising the multi-core plastic optical fiber according to any one of (1) to (8) above.
  • the present invention makes it possible to provide a multi-core plastic optical fiber with a wide transmission bandwidth.
  • the multi-core plastic optical fiber of the present invention has a cross-sectional shape consisting of two or more island portions and a sea portion surrounding the island portions.
  • Each of the islands consists of a core and a cladding surrounding it.
  • the core is a transmission portion that directly propagates the signal light and plays a role in efficiently transmitting the signal light.
  • the resin in the resin composition that forms the core is preferably a material that is translucent and has low transmission loss, and examples of such materials include acrylic resin, modified polycarbonate resin, cycloolefin resin, styrene resin, and olefin resin such as polymethylpentene. Among these resins, acrylic resin, which has low transmission loss characteristics, is preferred.
  • acrylic acid esters examples include alkyl acrylates such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, aryl acrylates such as phenyl acrylate, and cycloalkyl acrylates such as cyclohexyl acrylate and norbornenyl acrylate.
  • alkyl acrylates such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate
  • aryl acrylates such as phenyl acrylate
  • cycloalkyl acrylates such as cyclohexyl acrylate and norbornenyl acrylate.
  • acrylic resins include sodium polyacrylate resins, polyacrylonitrile resins, and polyacrylamide resins.
  • modified polycarbonate resin examples include polycarbonate resins substituted with lower alkyl groups or trifluoromethyl groups and having an average molecular weight of 10,000 to 200,000.
  • cycloolefin resin examples include cycloolefin polymers such as addition copolymers of ring-opening metathesis polymerization polymers and ethylene, and hydrogenated ring-opening metathesis polymerization polymers, as well as cycloolefin copolymers such as ethylene-2-norbornene.
  • the resin composition constituting the core may be appropriately added with dopants that increase the refractive index, such as germanium, phosphorus, tin, boron, etc., or fluorine-based dopants that decrease the refractive index, such as fluorine-based materials such as magnesium fluoride.
  • dopants that increase the refractive index such as germanium, phosphorus, tin, boron, etc.
  • fluorine-based dopants that decrease the refractive index such as fluorine-based materials such as magnesium fluoride.
  • the refractive index (N1) of the core is preferably 1.45 or more and 1.60 or less.
  • N1 1.45 or more, and more preferably 1.48 or more the refractive index difference with the cladding can be increased, and the rate at which signal light leaks into the sea portion can be reduced.
  • N1 1.60 or less, and more preferably 1.52 or less the refractive index difference with the cladding can be suppressed, and the number of modes of propagating light can be reduced, thereby expanding the transmission bandwidth.
  • the refractive index can be measured in accordance with JIS K 7142:2014 using an Abbe refractometer at room temperature of 25°C for a 20 mm x 8 mm x 1.4 mm test piece. If it is difficult to extract a core and measure the refractive index directly, the core can be heated at 210°C for 5 minutes using a press molding machine, then cooled to room temperature to produce a test piece molded to 20 mm x 8 mm x 1.4 mm, and the refractive index can be measured. If the composition of the core is known, a test piece can be similarly produced from the known composition and the refractive index can be measured.
  • the cross-sectional shape of the core is preferably a perfect circle rather than a polygon, as it is more uniform and has fewer irregularities, and in order to transmit signal light over long distances, it is preferable that the cross-sectional shape of the core extends uniformly and straight, with as little cylindricity as possible.
  • cylindricity is an index that indicates the degree of deviation from a geometrically correct true cylinder in accordance with JIS B0621:1984.
  • the average inner diameter of the core is preferably 5 to 100 ⁇ m.
  • the average inner diameter 5 ⁇ m or more By making the average inner diameter 5 ⁇ m or more, more preferably 20 ⁇ m or more, and even more preferably 30 ⁇ m or more, it is possible to perform stable spinning processing, stabilize the cross-sectional shape of the core, and improve the light transmittance of the core, thereby improving the propagation efficiency and making long-distance transmission more effective.
  • the average radius 100 ⁇ m or less more preferably 60 ⁇ m or less, and even more preferably 40 ⁇ m or less, it is possible to expand the transmission band.
  • the cladding protects the core from external environmental factors and reduces the rate at which signal light propagating through the core is reflected at the cladding interface and leaks into the sea portion.
  • the resins constituting the clad may be, for example, acrylic resins and other resins that are the same as those constituting the core, as well as fluororesins such as vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymers, vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether copolymers, vinylidene fluoride/trifluoroethylene copolymers, fluorinated acrylic ester polymers, polyperfluorobutyl methacrylate, polyperfluoroisopropyl methacrylate, and polyhexafluoro2-propyl methacrylate.
  • fluororesins such as vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymers, vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene/perfluor
  • the cladding may be doped with a dopant, such as a fluorine-based material such as magnesium fluoride, in order to adjust the refractive index.
  • a dopant such as a fluorine-based material such as magnesium fluoride
  • the cladding may also contain a coloring material. By adding a coloring material to the cladding, the amount of signal light leaking into the sea can be reduced.
  • the content (mass %) of the coloring substance in the cladding is preferably smaller than the content (mass %) of the coloring substance in the sea. If the content (mass %) of the coloring substance in the cladding is greater than the content (mass %) of the coloring substance in the sea, the melt viscosity of the resin composition when forming the cladding increases, and it may be difficult to form the cladding to the desired dimensions unless the extrusion stress is increased, or the extrusion stress may deform the core or sea.
  • the content (mass %) of the coloring substance in the cladding is preferably smaller than the content (mass %) of the coloring substance in the sea. Specifically, the content is preferably less than 3 mass %.
  • the refractive index (N2) of the cladding is preferably 1.35 or more, and more preferably 1.38 or more, the difference in refractive index with the core is small, and the number of modes of propagating light is reduced, allowing the transmission bandwidth to be expanded.
  • N2 is preferably 1.50 or less, and more preferably 1.42 or less, the proportion of signal light propagating through the core that is reflected at the cladding interface and leaks into the sea can be reduced.
  • N2 can be measured in the same way as N1. If it is difficult to collect the clad and directly measure its refractive index, the collected clad can be heated at 210°C for 5 minutes in a press molding machine, then cooled to room temperature to produce a test piece measuring 20 mm x 8 mm x 1.4 mm, and the refractive index can be measured. Also, if the composition of the clad is known, a test piece can be similarly produced from the known composition and the refractive index can be measured.
  • the refractive index of the cladding (N2) must be lower than the refractive index of the core (N1).
  • N2 lower than N1
  • the difference between N1 and N2 0.02 or more, and more preferably 0.05 or more
  • the proportion of signal light propagating through the core that is reflected at the cladding interface and leaks into the sea can be reduced.
  • the difference between N1 and N2 preferably 0.20 or less, and more preferably 0.09 or less, the number of modes of propagating light can be reduced and the transmission bandwidth can be expanded.
  • the claddings surround the cores in a one-to-one correspondence, and each cladding is independent of the other claddings.
  • one core and the cladding surrounding it form the island portions that are independent of each other. This structure makes it possible to prevent light leaking from one core from crosstalking to other cores through the cladding.
  • the thickness of the cladding is preferably 1/20 to 1/3 times the inner diameter of the cross section of the core, and more preferably 1/10 to 1/3 times.
  • the multi-core plastic optical fiber of the present invention has two or more island portions per fiber.
  • the cores of each island portion can propagate separate light, so that it is possible to realize a large communication capacity per fiber.
  • the number of island portions preferably 10,000 or less, more preferably 5,000 or less, even more preferably 3,000 or less, and even more preferably 1,000 or less, it is possible to prevent the inner diameter of the core from being too small, perform stable spinning processing, stabilize the cross-sectional shape of the core, and more effectively improve long-distance transmission.
  • the cores of the island portion are preferably arranged in a square lattice pattern.
  • the cores in a square lattice pattern it is possible to correspond one-to-one with the arrangement of the light sources, and it is possible to increase the inner diameter of the cores and improve the light transmittance of the optical fiber.
  • the cores being arranged in a square lattice pattern means that the cores are regularly arranged in a lattice pattern, with equal intervals between each other.
  • the sea portion serves to protect the multiple island portions from external environmental factors, and also serves to prevent signal light propagating through an island portion from leaking into the sea portion from reaching other adjacent cores.
  • the resin composition constituting the sea portion may be, for example, acrylic resin, modified polycarbonate resin, cycloolefin resin, styrene resin, olefin resin such as polymethylpentene, or other thermoplastic polymers, which are used in the core, or fluororesins such as vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer, vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether copolymer, vinylidene fluoride/trifluoroethylene copolymer, acrylic acid fluorinated ester polymer, polyperfluorobutyl methacrylate, polyperfluoroisopropyl methacrylate, or polyhexafluoro2-propyl methacrylate, which are used in the cladding.
  • fluororesins such as vinylidene fluoride/tetrafluoroethylene/
  • the sea portion may contain a coloring material.
  • a coloring material in the sea portion, the multi-core plastic optical fiber of the present invention can reduce noise such as crosstalk because when separate light is propagated to each core, the light leaking from each core is less likely to reach adjacent cores.
  • the coloring material contained in the sea component has the function of blocking the signal light from reaching other adjacent cores over the entire range of the signal light's wavelength. Therefore, if the signal light's wavelength range is outside the visible light range, it is sufficient that the blocking function is only present for wavelengths within that range, and does not necessarily mean coloring in visible light. For example, if the signal light is infrared laser light, it may be transparent in the visible light range as long as it has the blocking function over the entire infrared range, and such infrared absorbing agents are also included in the category of the coloring material.
  • coloring materials in black, white, or gray that can perform the blocking function over the entire range of visible light
  • specific coloring materials include carbon black, lead oxide, titanium oxide, and organic pigments.
  • Organic dyes can also be used, but if they are migratory, they will migrate from the sea to the core if left for a long period of time, significantly reducing the transmission efficiency of the core, so it is necessary to select a material with low migration properties.
  • Carbon black is preferable from the standpoint of material cost and workability.
  • the average primary particle size of the carbon black is preferably 0.1 to 10 ⁇ m.
  • the particle size 0.1 ⁇ m or more it is possible to prevent the melt viscosity of the sea resin composition from increasing over time due to aggregation during long-term spinning processing.
  • the particle size 10 ⁇ m or less it is possible to prevent clogging at the narrowest point of the sea portion.
  • the content of the coloring material relative to the entire resin composition constituting the sea portion depends on the properties of the coloring material, but when the coloring material is carbon black with an average primary particle size of 0.1 to 10 ⁇ m, the content of the carbon black in the sea portion is preferably 0.3 to 5 mass%. By making the content 0.3 mass% or more, it is possible to effectively reduce noise such as crosstalk. In addition, by making the content 5 mass% or less, it is possible to prevent the melt viscosity of the resin composition in the sea portion from increasing suddenly.
  • the refractive index (N3) of the sea portion is preferably 1.40 or more, and more preferably 1.48 or more, the difference in refractive index with the cladding becomes large, and the transmission bandwidth can be expanded by preventing leaked signal light from reaching other adjacent cores.
  • N3 is preferably 1.70 or less, and more preferably 1.60 or less, the transparency of the sea portion is improved, and the translucency of the multi-core plastic optical fiber as a whole can be improved.
  • N3 can be measured in the same way as N1 and N2. If it is difficult to collect the sea part and measure the refractive index directly, the collected sea part can be heated at 210°C for 5 minutes in a press molding machine, then cooled to room temperature to prepare a test piece measuring 20 mm x 8 mm x 1.4 mm, and the refractive index can be measured. If the composition of the sea part is known, a test piece can be prepared in the same way from the known composition, and the refractive index can be measured.
  • the refractive index of the sea portion (N3) must be higher than the refractive index of the cladding (N2).
  • N3 higher than N2, and preferably making the difference between N3 and N2 0.05 or more, and more preferably 0.10 or more, signal light leaking from an island is reflected at the sea/cladding interface and does not enter other islands, preventing crosstalk and expanding the transmission bandwidth.
  • the refractive index of the sea (N3) is equal to or greater than the refractive index of the core (N1).
  • the average transmittance of the sea portion at wavelengths of 400 to 700 nm is lower than the average transmittance of the core at wavelengths of 400 to 700 nm. In this way, the signal that has passed through the sea is not transmitted as noise, and transmission efficiency can be improved.
  • means for adjusting these average transmittances include the aforementioned coloring substances and adjusting the transparency of the material.
  • the sea part is the outermost layer.
  • the signal light leaking into the sea part is attenuated and lost on the fiber surface, and the leaked signal light can be prevented from reaching other adjacent cores.
  • the cross section of the multi-core plastic optical fiber of the present invention is preferably circular from the viewpoint of handling, and its diameter is preferably 0.2 mm to 10 mm. If the diameter is 0.2 mm or more, it has a suitable rigidity and is easy to handle, and if it is 10 mm or less, it has a suitable flexibility and is easy to handle.
  • a method for producing the multi-core plastic optical fiber of the present invention for example, a method of continuously molding each of the resin compositions constituting the core, the cladding, and the sea part into a predetermined shape can be mentioned.
  • the continuous molding method it is preferable to form by a composite spinning method using an extrusion die. Unlike other resin molding dies, the extrusion die does not cool and solidify any of the resin compositions inside the extrusion die, and the resin composition constituting the core, the resin composition constituting the cladding, and the resin composition constituting the sea part are extruded from the core discharge part, the cladding discharge part, and the sea part discharge part, respectively, and then cooled and solidified to be molded into a predetermined shape.
  • the extrusion die is not particularly limited as long as it can form the multi-core plastic optical fiber of the present invention, but it is preferable to arrange a plurality of sea component discharge parts so as to surround the outer circumference of the core discharge part and the clad discharge part.
  • a plurality of sea component discharge parts so as to surround the outer circumference of the core discharge part and the clad discharge part.
  • each core outlet part will continue to be the same as the cross-sectional shape of each core outlet part as it cools and solidifies, and the cross-sectional shape of each core outlet part will continue to be reflected as is in the cross-sectional shape of the core. If the cross-sectional shape of each core outlet part is processed into a perfect circle with extremely high precision, it will be possible to form a multi-core plastic optical fiber with a perfect cylindrical shape with very little deformation of the core.
  • the shape of the clad discharge portion may be a ring shape with an inner diameter the same as the inner diameter of the clad and an outer diameter the same as the outer diameter of the clad, or an inner diameter slightly larger than the inner diameter of the clad and an outer diameter slightly smaller than the outer diameter of the clad.
  • it may be formed with the same width as the width of the clad in the former case, or a ring shape with a width slightly narrower than the width of the clad in the latter case.
  • the clad discharge portion may be formed as multiple spots at equal intervals on the centerline circle of the ring-shaped clad.
  • the timing of the discharge of the resin compositions constituting the core, clad, and sea portions is preferably as simultaneous as possible, and even if there is a difference, it is preferable that the timing is less than one second, which is substantially the same as when the resin compositions are discharged simultaneously.
  • the amount of each resin composition discharged is preferably such that the extrusion stress caused by the resin composition constituting the sea discharged from the sea discharge portion surrounded by each core, which is applied to the resin composition constituting each core, and conversely, the extrusion stress caused by the resin composition constituting each core discharged from each core discharge portion, which is applied to the resin composition constituting each sea, is the same at every location, and these stresses continue to cancel each other out, so that the cross-sectional shape of the core can be maintained as a perfect circle.
  • the multi-core plastic optical fiber or the optical communication cable of the present invention can be suitably used in an optical communication system.
  • the optical communication system of the present invention uses the multi-core plastic optical fiber or the optical communication cable of the present invention and performs spatial multiplexing communication using multiple signal beams, thereby enabling large-capacity communication.
  • a network analyzer (MS46122B manufactured by Anritsu) was connected to a VCSEL laser with a wavelength of 670 nm and an O/E converter (SPA-2_650 nm manufactured by Graviton).
  • SPA-2_650 nm manufactured by Graviton
  • the multi-core plastic optical fiber in each example and comparative example was cut into two pieces with lengths of 30 m and 1 m, respectively, and both end faces were mirror-polished using an abrasive sheet.
  • the light emitted from the VCSEL laser was collimated to a width of 2 mm, and was focused on one core of the multi-core plastic optical fiber using an objective lens with a numerical aperture (NA) of 0.3 and a pupil diameter of 10 mm.
  • NA numerical aperture
  • the other side of the optical fiber was connected to an O/E converter.
  • the frequency was swept from 0 GHz to 2 GHz, and the transmission characteristic (S21) was measured at 0.1 GHz intervals.
  • the measurement value at 1 m was subtracted from the measurement value at 30 m to create a difference profile. In the profile, the frequency at the point where the transmission characteristic at 0 GHz was reduced by 3 dB was measured as the transmission band.
  • Example 1 A resin composition A for the core, B for the cladding, and C for the sea portion were prepared, and each of them was poured into a spinning pack incorporating an extrusion die, melted at 250°C, and then polymer flows were discharged from each discharge portion to obtain a multi-core plastic optical fiber.
  • the extrusion die used had distribution holes for a core discharge portion, a cladding discharge portion surrounding the core, and a sea discharge portion surrounding the island portion.
  • the number of cores was 64, closely packed, and the number of cores per independent cladding region was 1.
  • the obtained optical fiber had a core diameter of 40 ⁇ m, a core center distance of 50 ⁇ m, and a cladding thickness of 3.0 ⁇ m.
  • Table 1 The results of the evaluation by the above-mentioned method are shown in Table 1.
  • Example 2 An optical fiber was produced in the same manner as in Example 1, except that the resin composition constituting the sea portion was changed to B.
  • the obtained optical fiber had a core diameter of 40 ⁇ m, a core center interval of 50 ⁇ m, and a cladding thickness of 3.0 ⁇ m.
  • Table 1 Since the refractive index of the sea portion was the same as that of the core, the transmission band was good.
  • Example 3 An optical fiber was produced in the same manner as in Example 1, except that the resin composition constituting the sea portion was changed to D.
  • the obtained optical fiber had a core diameter of 40 ⁇ m, a core center interval of 50 ⁇ m, and a cladding thickness of 3.0 ⁇ m.
  • Table 1 The results of evaluation by the above-mentioned method are shown in Table 1. Since the refractive index of the sea portion was larger than that of the core, the transmission band was better.
  • Example 4 An optical fiber was produced in the same manner as in Example 1, except that the resin composition constituting the core was changed to D and the resin composition constituting the sea portion was changed to D.
  • the optical fiber obtained had a core diameter of 40 ⁇ m, a core center distance of 50 ⁇ m, and a cladding thickness of 3.0 ⁇ m.
  • Table 1 Since the refractive index of the sea portion was the same as that of the core, the transmission band was good.
  • Example 1 An optical fiber was produced in the same manner as in Example 1, except that the resin composition constituting the core was changed to E.
  • the obtained optical fiber had a core diameter of 40 ⁇ m, a core center interval of 50 ⁇ m, and a cladding thickness of 3.0 ⁇ m.
  • the results of evaluation by the above-mentioned method are shown in Table 1.
  • the refractive index of the sea portion was smaller than the refractive index of the cladding, so the transmission band was poor.
  • a resin composition A constituting the core and B constituting the cladding were prepared, and each was poured into a spinning pack incorporating an extrusion die, melted at 250°C, and then polymer flows were discharged from each discharge section to obtain a multi-core plastic optical fiber.
  • the extrusion die used had distribution holes for the core discharge section and the cladding discharge section surrounding the cores. In the cross section of the fiber, the number of cores was 64, and they were arranged in a staggered pattern.
  • the obtained optical fiber had a core diameter of 40 ⁇ m and a core center distance of 50 ⁇ m. The results of the evaluation using the above method are shown in Table 1. The obtained optical fiber did not include a sea portion, and therefore the transmission band was poor.
  • a resin composition A was prepared as a resin composition constituting the core, B as a resin composition constituting the clad, and A as a resin composition constituting the sea portion. Each of them was poured into a spinning pack incorporating an extrusion die, melted at 250°C, and then polymer flows were discharged from each discharge section to obtain a multi-core plastic optical fiber.
  • the extrusion die used had distribution holes for the core discharge section, the clad discharge section surrounding the cores collectively, and the sea discharge section surrounding the clad.
  • the number of cores was 64, arranged in a staggered pattern, and the number of cores per independent clad region was 64.
  • the obtained optical fiber had a core diameter of 40 ⁇ m and a core center distance of 50 ⁇ m.
  • the results of evaluation by the above-mentioned method are shown in Table 1.
  • the obtained optical fiber had a poor transmission band because the clad did not surround each core individually.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'une fibre optique en plastique à âmes multiples, d'un câble de communication optique et d'un système de communication optique, tous ayant une large bande de transmission.　La présente invention concerne une fibre optique en plastique à âmes multiples ayant une forme de section transversale comprenant au moins deux parties d'îlot et une partie de mer entourant les parties d'îlot. Les parties d'îlot comprennent chacune une âme unique et une gaine qui entoure l'âme dans une correspondance biunivoque avec l'âme. Chaque gaine est indépendante d'une autre gaine. L'indice de réfraction (N2) de la gaine est inférieur à l'indice de réfraction (N1) de l'âme. L'indice de réfraction (N3) de la partie de mer est supérieur à l'indice de réfraction (N2) de la gaine.
PCT/JP2024/037112 2023-10-30 2024-10-18 Fibre optique en plastique à âmes multiples, câble de communication optique et système de communication optique Pending WO2025094697A1 (fr)

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