Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Other

Adeka Corporation

Kazuyuki Sohma

Yuya Homma

Kensaku Shimada

Tomoyuki Hattori

Itaru Sakabe

Takashi Fujii

Tatsuya Konishi

Katsushi Hamakubo

Takahiro Nomura

Takehiro Hosokawa

Noriaki Iwaguchi

Tadashi Enomoto

Takashi Takada

Tatsuya Kakuta

Masaaki Hirano

Toshiaki Kakii

Masashi Onishi

Takahiro Saito

Seiichi Saito

Masumi Ito

Toshifumi Hosoya

Seiko Mitachi

Keisei Morita

Tomomi Moriya

Eiji Yanada

Kazuhiro Kuwa

Koichi Sakamaki

Kazuya Tokuda

Takashi Sueyoshi

Takehiko Kawano

An optical fiber includes a glass fiber and a coating resin layer surrounding the outer periphery of the glass fiber. The coating resin layer has a primary resin layer that surrounds the outer periphery of the glass fiber, and a secondary resin layer that surrounds the outer periphery of the primary resin layer. The primary resin layer has a thickness of 7.5 μm or more and 17.5 μm or less. The primary resin layer has a Young's modulus of 0.10 MPa or greater and 0.50 MPa or less at 23° C. The secondary resin layer has a thickness of 5.0 μm or more and 17.5 μm or less. The secondary resin layer has an outer diameter of 165 μm or more and 175 μm or less. The secondary resin layer has a Young's modulus of 1200 MPa or greater and 2800 MPa or less at 23° C.

Optical fiber

A method of manufacturing an optical fiber includes applying a curable resin composition containing a photopolymerization initiator so that an outer circumference of a glass fiber including a core and a cladding is coated, and forming a coating layer by radiating an ultraviolet ray to the curable resin composition and curing the curable resin composition. Forming the coating layer includes providing two or more non-radiation periods and intermittently radiating the ultraviolet ray three or more times so that a total time of the non-radiation periods is 0.010 seconds or more.

Method of manufacturing optical fiber and optical-fiber-manufacturing apparatus

An optical fiber includes a glass fiber including: a core and a cladding; and a coating resin layer coating the glass fiber in contact with the glass fiber; wherein the coating resin layer has a primary resin layer coating the glass fiber in contact with the glass fiber and a secondary resin layer coating the primary resin layer, the primary resin layer contains a cured product of a first resin composition containing a photopolymerizable compound and a phosphine oxide-based photopolymerization initiator, the secondary resin layer contains a cured product of a second resin composition containing a photopolymerizable compound and a phosphine oxide-based photopolymerization initiator, and an amount of the phosphine oxide-based photopolymerization initiator remaining unreacted in the coating resin layer is 0.5 mass % or less.

Optical fiber and method for manufacturing optical fiber

A resin composition for coating an optical fiber comprises a base resin containing an oligomer, a monomer, and a photopolymerization initiator, and hydrophobic inorganic oxide particles, wherein the oligomer comprises urethane (meth)acrylate and epoxy (meth)acrylate, and the mass ratio of the content of urethane (meth)acrylate to the content of epoxy (meth)acrylate is 0.25 or more.

Resin composition, optical fiber, and method for manufacturing optical fiber

An optical fiber comprises a glass fiber comprising a core and a cladding, and a coating resin layer covering the outer periphery of the glass fiber, wherein the average linear expansion coefficient of the coating resin layer at −50° C. or more and 0° C. or less is 3.3×10/° C. or more and less than 9.0×10/° C.

A resin composition comprises: a base resin containing an oligomer, a monomer, and a photopolymerization initiator; and inorganic oxide particles, wherein the inorganic oxide particles are lump-shaped aggregated particles, and the volume average particle size of the inorganic oxide particles measured by an X-ray small angle scattering method is 5 nm or more and 800 nm or less.

Resin composition, optical fiber secondary coating material, optical fiber and manufacturing method of optical fiber

An optical fiber comprises a glass fiber comprising a core and a cladding; and a coating resin layer coating the glass fiber, wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer, the primary resin layer has a Young's modulus of 0.4 MPa or less at 23&#xb0; C. and the primary resin layer has an outer diameter of 185 &#x3bc;m or more and 202 &#x3bc;m or less, the secondary resin layer has a glass transition temperature of 60&#xb0; C. or more and 95&#xb0; C. or less, and the difference between the average linear expansion coefficient of the coating resin layer in the range of 60&#xb0; C. to 140&#xb0; C. and the average linear expansion coefficient of the coating resin layer in the range of &#x2212;60&#xb0; C. to 0&#xb0; C. is 0.7&#xd7;10/&#xb0; C. or less.

Optical fiber with primary and secondary coating layers

A splicing structure of optical fibers in which optical fibers are coupled together, the optical fibers each comprising: a coated fiber portion including a glass fiber and a coating layer coating an outer periphery of the glass fiber; and a bare fiber portion where a certain length of the glass fiber is projected from an end face of the coating layer in an extending direction, wherein the glass fiber end faces of the bare fiber portion are fusion coupled together, and an outer periphery of the bare fiber portion is coated by a recoating layer, the recoating layer is a cured product of an ultraviolet light curable resin composition including a urethane (meth)acrylate oligomer and a mold release agent, and a content of the mold release agent is 0.01 to 1.5% by mass based on a total amount of the ultraviolet light curable resin composition.

Splicing structure of optical fibers

An optical fiber includes an optical transmission medium comprising a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, and 1.1 ppm or less of a phosphorus compound and 2.5% by mass or less of a phenol compound based on the total amount of the primary resin layer are contained in the primary resin layer.

Provided is an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding. A Young's modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H&#x2264;3&#xd7;10Nm, the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, and the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000. The formulas include 

Optical fiber and method for producing optical fiber

In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter E(30) of the resin composition is 47 to 61.

Ultraviolet-curable resin composition and optical fiber

An optical fiber includes an optical transmission medium having a core and a cladding, a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium, and a secondary resin layer coating the primary resin layer, wherein a Young's modulus of the primary resin layer is 0.5 MPa or less at 23&#xb0; C., and the primary resin layer comprises a cured product of an ultraviolet light curable resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and a &#x3b2;-diketone compound, and tin.

An optical fiber includes an optical transmission medium having a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and a Young's modulus of the primary resin layer is 0.5 MPa or less at 23&#xb0; C.

An optical fiberA comprises an optical transmission memberincluding a coreand a clad, a primary resin layer, and a secondary resin layer. The effective area of the optical transmission memberis 130 &#x3bc;mor larger. The transmission loss of the optical transmission memberat a wavelength of 1550 nm is 0.165 dB/km or smaller. The Young's modulus of the primary resin layeris 0.7 MPa or lower, and the Young's modulus of the secondary resin layeris 600 MPa or higher and 1500 MPa or lower. The difference between the transmission loss when the optical fiberA is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-&#x3bc;m diameter and horizontal wires of a 50-&#x3bc;m diameter are wound and spaced at a pitch of 150 &#x3bc;m, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller.

A process for producing an optical fiber including a glass fiber, a primary resin coating layer which covers the periphery of the glass fiber, and a secondary resin coating layer which covers the periphery of the primary resin coating layer, wherein the primary resin coating layer is formed by curing a curable resin composition which includes one or more oligomers, one or more monomers, and a reaction initiator, the curable resin composition containing a one-end-capped oligomer in an amount of 30% by mass or larger based on all the oligomers. The optical fiber produced by this production process does not deteriorate in low-temperature transmission loss, because the primary resin coating layer is inhibited from generating voids even when having a low Young's modulus.

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Yokohama, Japan

Kazuyuki Sohma