Abstract: An optical fiber includes a glass fiber and a coating resin layer with which the glass fiber is covered, wherein the coating resin layer includes tin and a cured ultraviolet curable resin composition containing 2,4,6-trimethylbenzoyldiphenyl phosphine as a photoinitiator, a percentage of uncured components having a molecular weight of 1000 or less included in the coating resin layer is 15% by mass or less, and a fraction of an amount of a phosphorus-tin complex with respect to an amount of hydrocarbon on the surface of coating resin layer is 1000 ppm or less.

Abstract: 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.

Abstract: 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 ?40° C. of a void formed in the first layer is 100% or more and 300% or less of a longest diameter at 23° C. thereof, or a longest diameter at ?40° C. of a void formed in the first layer is 100% or more and 600% or less of a longest diameter at 23° C. thereof, and a Young's modulus of the first layer is 0.3 MPa or less.

Abstract: 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 13, a primary coating layer 16 that coats an outer periphery of the glass optical fiber 13, and a secondary optical fiber 17 that coats an outer periphery of the primary coating layer 16. Young's modulus of the primary coating layer 16 is 1.2 MPa or less and Young's modulus of the secondary coating layer 17 is 800 MPa or more. Sulfur content of the surface of the glass optical fiber 13 is 0.2% by atom or more. Sulfur is not present in the vicinity of the outer periphery of the primary coating layer 16.

Abstract: An optical fiber IA comprises an optical transmission member 10 including a core 12 and a clad 14, a primary resin layer 22, and a secondary resin layer 24. The effective area of the optical transmission member 10 is 130 ?m2 or larger. The transmission loss of the optical transmission member 10 at a wavelength of 1550 nm is 0.165 dB/km or smaller. The Young's modulus of the primary resin layer 22 is 0.7 MPa or lower, and the Young's modulus of the secondary resin layer 24 is 600 MPa or higher and 1500 MPa or lower. The difference between the transmission loss when the optical fiber 1A is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-?m diameter and horizontal wires of a 50-?m diameter are wound and spaced at a pitch of 150 ?m, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller.

Abstract: A coated glass fiber 1 comprising a glass fiber 10 and one or more coating layers each composed of an ultraviolet curable resin on the outer circumference of the glass fiber 10, 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 fiber 1 coated optical fiber having a high dynamic fatigue coefficient since adhesion between the surface of the glass fiber and the resin coating layer is satisfactory.

Abstract: 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 13, a primary coating layer 16 that coats an outer periphery of the glass optical fiber 13, and a secondary optical fiber 17 that coats an outer periphery of the primary coating layer 16. Young's modulus of the primary coating layer 16 is 1.2 MPa or less and Young's modulus of the secondary coating layer 17 is 800 MPa or more. Sulfur content of the surface of the glass optical fiber 13 is 0.2% by atom or more. Sulfur is not present in the vicinity of the outer periphery of the primary coating layer 16.

Abstract: 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.

Abstract: 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, R1 represents a group capable of reacting with an acryl group or an acryl group, and R2 to R8 are each the same or different and represent an alkyl group.

Abstract: A coated glass fiber 1 comprising a glass fiber 10 and a resin coating layer containing an inner layer 20 and an outer layer 30 provided on the outer circumference of the glass fiber 10, wherein the resin constituting the inner layer 20 is 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.

Abstract: A coated optical fiber 1 comprising a glass fiber 10 and a primary coating layer 20 on the outer circumference of the glass fiber 10, wherein a resin constituting the primary coating layer 20 contains 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 layer 20 of the coated optical fiber 1 has a good curability, and the coated optical fiber 1 exhibits a reduced microbending loss.

Abstract: Provided is a coated optical fiber excellent in both characteristics of the microbending loss resistance and the low-temperature characteristic. The coated optical fiber 1 comprises an optical fiber 10 that has a cladding layer composed of glass formed on an outer periphery of a glass core, a primary coating layer 20 that coats an outer periphery of the optical fiber 10, and a secondary coating layer 30 that coats an outer periphery of the primary coating layer 20, wherein the primary coating layer 20 has a Young's modulus of 1.2 MPa or less, the secondary coating layer 30 has a Young's modulus of 700 MPa or more, and the primary coating layer 20 contains tin in a content of 70 ppm or less.

Abstract: 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, R1 represents a group capable of reacting with an acryl group or an acryl group, and R2 to R8 are each the same or different and represent an alkyl group.

Abstract: A coated optical fiber 1 comprising a glass fiber 10 and a primary coating layer 20 on the outer circumference of the glass fiber 10, wherein a resin constituting the primary coating layer 20 contains 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 layer 20 of the coated optical fiber 1 has a good curability, and the coated optical fiber 1 exhibits a reduced microbending loss.

Abstract: A coated glass fiber 1 comprising a glass fiber 10 and one or more coating layers each composed of an ultraviolet curable resin on the outer circumference of the glass fiber 10, 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 fiber 1 coated optical fiber having a high dynamic fatigue coefficient since adhesion between the surface of the glass fiber and the resin coating layer is satisfactory.

Abstract: A coated glass fiber 1 comprising a glass fiber 10 and a resin coating layer containing an inner layer 20 and an outer layer 30 provided on the outer circumference of the glass fiber 10, wherein the resin constituting the inner layer 20 is 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.