Sumitomo Electric Industries, Limited

Kumiko Tachibana

Takashi Fujii

Noriaki Iwaguchi

Takashi Takada

Masuo Iida

Hiroshi Kohda

Tetsuya Nakanishi

Yoshinori Yamamoto

Tatsuya Konishi

An optical fiber comprises a glass fiber; a primary resin layer coating an outer periphery of the glass fiber; and a secondary resin layer coating an outer periphery of the primary resin layer, and a pH of the primary resin layer is greater than a pH of the secondary resin layer.

Optical fiber and method for manufacturing optical fiber

An optical fiber inspecting device is disclosed. The optical fiber inspecting device includes a first light-emitting unit that irradiates an optical fiber with a first light beam, the optical fiber including a glass fiber and a coating resin and moving in an axial direction, and a first light-receiving unit that receives scattered light resulting from the first light beam scattered in the optical fiber, and converts the scattered light to an electrical signal. An optical axis of the first light-receiving unit passes through an irradiation position where the first light beam strikes the optical fiber, and the first light beam and the optical axis of the first light-receiving unit diagonally intersect each other, thereby preventing the first light beam from directly entering the first light-receiving unit.

Optical fiber inspecting device, optical fiber manufacturing apparatus, method for inspecting optical fiber, and method for manufacturing optical fiber

An optical fiber comprises a glass fiber having a core and a cladding with which the core is covered, and a coating resin layer with which the glass fiber is covered, the coating resin layer having a colored layer of a thickness of 10 &#x3bc;m or more, wherein a change rate of a yellow index of the coating resin layer after aging due to temperature and humidity under an environment of 85&#xb0; C. and 85% RH for 30 days is 5 or less per day.

Optical fiber core and optical fiber ribbon core

An optical fiber comprises a glass fiber, and a coating resin layer with which the glass fiber is covered, the coating resin layer has a plurality of layers, the plurality of layers includes a first layer being in contact with the glass fiber, and a longest diameter at &#x2212;40&#xb0; C. of a void formed in the first layer is 100% or more and 300% or less of a longest diameter at 23&#xb0; C. thereof, or a longest diameter at &#x2212;40&#xb0; C. of a void formed in the first layer is 100% or more and 600% or less of a longest diameter at 23&#xb0; C. thereof, and a Young's modulus of the first layer is 0.3 MPa or less.

Optical fiber core and optical fiber tape core

Provided is a coated optical fiber excellent in both characteristics of the microbending loss resistance and the low-temperature characteristic. The coated optical fibercomprises an optical fiberthat has a cladding layer composed of glass formed on an outer periphery of a glass core, a primary coating layerthat coats an outer periphery of the optical fiber, and a secondary coating layerthat coats an outer periphery of the primary coating layer, wherein the primary coating layerhas a Young's modulus of 1.2 MPa or less, the secondary coating layerhas a Young's modulus of 700 MPa or more, and the primary coating layercontains tin in a content of 70 ppm or less.

Coated optical fiber

An optical fiber capable of achieving both of the ZSA property and the rapid curability is provided. The optical fiber includes a glass optical fiber, a primary coating layerthat coats an outer periphery of the glass optical fiber, and a secondary optical fiberthat coats an outer periphery of the primary coating layer. Young's modulus of the primary coating layeris 1.2 MPa or less and Young's modulus of the secondary coating layeris 800 MPa or more. Sulfur content of the surface of the glass optical fiberis 0.2% by atom or more. Sulfur is not present in the vicinity of the outer periphery of the primary coating layer

Optical fiber

A coated glass fibercomprising a glass fiberand one or more coating layers each composed of an ultraviolet curable resin on the outer circumference of the glass fiber, wherein the ultraviolet curable resin constituting at least one of the coating layers is formed of an ultraviolet curable coating material containing a silane coupling agent and a photoacid generator. The coated optical fibercoated optical fiber having a high dynamic fatigue coefficient since adhesion between the surface of the glass fiber and the resin coating layer is satisfactory.

The present invention relates to an optical fiber containing a glass fiber and a resinous coating layer that covers a periphery of the glass fiber, in which the resinous coating layer contains an ethanol of 10 mg or less or a methanol of 2 mg or less per gram of the resinous coating layer.

The present invention relates to an optical fiber containing a glass fiber and a coating layer in contact with the outer circumference of the glass fiber, and a method for manufacturing the optical fiber, in which the coating layer contains silane coupling agents represented by the following formulae (1) and (2): in the formulae, Rrepresents a group capable of reacting with an acryl group or an acryl group, and Rto Rare each the same or different and represent an alkyl group.

Optical fiber and method for manufacturing the same

A coated glass fibercomprising a glass fiberand a resin coating layer containing an inner layerand an outer layerprovided on the outer circumference of the glass fiber, wherein the resin constituting the inner layeris formed by curing a urethane-based ultraviolet curable resin composition containing a surfactant in an amount of 0.1 to 1.0% by weight and Young's modulus thereof is from 0.3 to 10 MPa. The coated optical fiber has a good water immersion resistance.

A coated optical fibercomprising a glass fiberand a primary coating layeron the outer circumference of the glass fiber, wherein a resin constituting the primary coating layercontains ingredient(s) having a molecular weight of more than 1,000, which is extracted with methyl ethyl ketone, in an amount of 5% by weight or more and 21% by weight or less and has a Young's modulus of 0.2 to 1.0 MPa. The resin constituting the primary coating layerof the coated optical fiberhas a good curability, and the coated optical fiberexhibits a reduced microbending loss.

A method of manufacturing an optical fiber includes a first step of drawing an optical fiber preform into a glass fiber and disposing a fiber coating on the outer circumference of the glass fiber to form a parent optical fiber; a second step of cutting the parent optical fiber into a plurality of individual optical fibers; a third step of determining, at, at least, one spot of the parent optical fiber, a failure strength F1 and a failure time T; a fourth step of determining a failure strength F2 of each of the individual optical fibers; and a fifth step of selecting an optical fiber having a failure strength F2 of 5.5 kgf or more from the individual optical fibers cut from the parent optical fiber whose failure strength F1 and failure time T satisfy the inequality T&#x3e;2.6&#xd7;10&#xd7;exp(4.736&#xd7;F1).

Growing community of inventors

Yokohama, Japan

Kumiko Tachibana