Abstract: A coated optical fiber, including a coating layer with a high elastic modulus even when a glass optical fiber is coated with resin by using an ultraviolet semiconductor light emitting element as a light source for curing resin and using a Wet-on-Wet method, is provided. A manufacturing method of the coated optical fiber includes: applying a first ultraviolet curable resin to a glass optical fiber; applying a second ultraviolet curable resin to the periphery of the first ultraviolet curable resin before curing the first ultraviolet curable resin; and irradiating the first and second ultraviolet curable resins with light in a wavelength range of 350 to 405 nm emitted from an ultraviolet semiconductor light emitting element, wherein the second ultraviolet curable resin contains a photopolymerization initiator that absorbs the light from the ultraviolet semiconductor light emitting element to generate radicals, and the photopolymerization initiator has photobleaching properties.

Abstract: The present invention provides a two-layer structure colored optical fiber which includes a colored secondary coating layer improved in collectability and separability. The two-layer structure colored optical fiber in an embodiment of the present invention includes a glass optical fiber, a primary coating layer coating the glass optical fiber, and a colored secondary coating layer coating the primary coating layer. The secondary coating layer has such characteristics that a surface cure percentage is 99% or more at an infrared absorption peak of a wave number of 1407 cm?1 and a surface kinetic friction force in Knot Test is less than 0.075 N.

Abstract: A method of producing an optical fiber, containing: (a) a resin application step of applying an ultraviolet curable resin, onto an outer circumference of an optical fiber; (b) a heating step of heating the ultraviolet curable resin; and (c) a light irradiation step of irradiating the ultraviolet curable resin with ultraviolet light emitted from a semiconductor light emitting element, in a state in which the ultraviolet curable resin is heated, to cure the ultraviolet curable resin into a coating resin.

Abstract: An optical fiber ribbon according to the present invention includes a collective coating layer containing an ultraviolet curable resin containing amorphous PPG and an amorphous monomer, the collective coating layer formed around coated optical fibers. The collective coating layer has an equilibrium elastic modulus of 12 MPa to 20 MPa, both inclusive, and a yield point elongation of 5% to 9%, both inclusive, and the adhesion between the collective coating layer and the outermost layers of the coated optical fibers is 12 N/cm to 15 N/cm, both inclusive.

Abstract: A colored optical fiber including a glass optical fiber; a primary coating layer that covers the glass optical fiber; a secondary coating layer that covers the primary coating layer; and a colored layer that coats the secondary coating layer. The relaxation modulus after 24 hours at 60° C. of of the layers coated is 140 MPa or less.

Abstract: In an embodiment of the present invention, provided is an optical fiber including a glass core, and a polymer cladding formed around the glass core, the polymer cladding containing a mixture of a polymerizable composition and a silane coupling agent, and a fluorine-based ultraviolet curable resin. The mixture contains 5 to 95 parts by weight of the silane coupling agent based on 100 parts by weight of the total weight of the mixture. The fluorine-based ultraviolet curable resin alone has a refractive index in a range of 1.350 to 1.420 after ultraviolet curing. A component originated from the silane coupling agent is concentrated within a range of 20 ?m or less in the polymer cladding from an interface between the glass core and the polymer cladding.

Abstract: The purpose of the present invention is to provide, by a configuration or method different from conventional art, a coated optical fiber enabling reduced interface delamination between a glass fiber and a primary coating layer when the coated optical fiber is immersed in water, and a reduction of transmission loss increase. A coated optical fiber according to one embodiment of the present invention is provided with a glass fiber, a primary coating layer coated on the glass fiber, a secondary coating layer coated on the primary coating layer, and a colored layer coated on the secondary coating layer. The coated optical fiber is configured so that small water bubbles are generated substantially evenly within the primary coating layer when the coated optical fiber is immersed for 200 days in warm water of 60° C.

Abstract: An optical fiber ribbon according to the present invention includes a collective coating layer containing an ultraviolet curable resin containing amorphous PPG and an amorphous monomer, the collective coating layer formed around coated optical fibers. The collective coating layer has an equilibrium elastic modulus of 12 MPa to 20 MPa, both inclusive, and a yield point elongation of 5% to 9%, both inclusive, and the adhesion between the collective coating layer and the outermost layers of the coated optical fibers is 12 N/cm to 15 N/cm, both inclusive.

Abstract: A colored optical fiber including a glass optical fiber; a primary coating layer that covers the glass optical fiber; a secondary coating layer that covers the primary coating layer; and a colored layer that coats the secondary coating layer. The relaxation modulus after 24 hours at 60° C. of of the layers coated is 140 MPa or less.

Abstract: The present invention provides an optical fiber which can have a larger NA and a preferable mechanical strength even with a monolayer coating and can be fabricated at low cost, and which can transmit excitation light efficiently reducing a loss even under a high temperature environment during the operation of a fiber laser. An optical fiber according to an embodiment of the present invention includes a core, a glass cladding which is provided at a periphery of the core and has a refractive index smaller than the core, and a polymer cladding which is provided at a periphery of the glass cladding and has a refractive index smaller than the glass cladding. The polymer cladding contains fluorine and the polymer cladding has a difference between an elasticity modulus at 60° C. and that at 23° C. equal to or smaller than 100 MPa and also has an elasticity modulus equal to or larger than 200 MPa at 23° C.

Abstract: The present invention provides a colored coated optical fiber which hardly has an increase in transmission loss even when immersed in water. A colored coated optical fiber according to one embodiment of the present invention includes a glass optical fiber, a primary coating layer covering the glass optical fiber, a secondary coating layer covering the primary coating layer, and a colored layer covering the secondary coating layer. A ratio of a thermal expansion coefficient of a laminate including the secondary coating layer and the colored layer covering the secondary coating layer to that of the secondary coating layer is 0.98 or more and 1.03 or less. A ratio of a glass transition temperature based on a dynamic viscoelasticity within a temperature range from ?100° C. to 150° C. of the laminate to that of the secondary coating layer is 0.96 or more and 1.03 or less.

Abstract: The present invention provides an optical fiber in which the transmission loss increase is suppressed even under a high-humidity condition or under a water-immersed condition. A colored optical fiber (22) according to an embodiment of the present invention is a colored optical fiber (22) formed by applying a colored layer to an optical fiber (14) including a glass optical fiber coated with at least a double-layered coating layer of a soft layer and a hard layer, and the ratio of thermal expansion coefficient between the coating layer after the colored layer of the colored optical fiber (22) is applied and the coating layer of the optical fiber (14) before the colored layer is applied is 0.87 or more.

Abstract: An optical fiber holding apparatus in accordance with the present invention is characterized in that the same comprises a surface in order to hold an optical fiber which is to be a state of which is rolled up so as not to overlap with each other, wherein at least the surface is formed of a thermo conductive molding body which has a thermal conductivity to be higher than or equal to 0.5 W/mK, and which has an Asker C hardness to be between twenty and fifty. Or, the same comprises a peripheral surface in order to roll up and hold an optical fiber, wherein at least the peripheral surface is formed of a thermo conductive molding body which has the thermal conductivity to be higher than or equal to 0.5 W/mK, and which has the Asker C hardness to be between twenty and fifty. Moreover, it is desirable for the thermo conductive molding body to have a compressive strength of which a peak value is between ten and thirty N/cm2 and a stabilized value is between three and ten N/cm2.

Abstract: The present invention provides an optical fiber in which composites constructing its coating are not complicated, so, there is also little constraint in view of production, and, moreover, delamination between a glass optical fiber and a primary layer, and a bubble in the primary layer hardly arise. The optical fiber of the present invention is an optical fiber which has a glass optical fiber which has a core 1, which passes an optical signal, in a center portion, and a cladding 2 surrounding this, a primary protective layer 3 made to coat the glass optical fiber, a secondary protective layer 4 applied on this primary protective layer 3, and a third protective layer 5 applied to an outer periphery of this secondary protective layer 4, wherein glass transition temperature of the primary protective layer 3 is made to be higher than ?20° C. and 10° C. or lower, glass transition temperature of the secondary protective layer 4 is made to be ?10° C.

Abstract: The present invention provides an optical fiber which can have a larger NA and a preferable mechanical strength even with a monolayer coating and can be fabricated at low cost, and which can transmit excitation light efficiently reducing a loss even under a high temperature environment during the operation of a fiber laser. An optical fiber according to an embodiment of the present invention includes a core, a glass cladding which is provided at a periphery of the core and has a refractive index smaller than the core, and a polymer cladding which is provided at a periphery of the glass cladding and has a refractive index smaller than the glass cladding. The polymer cladding contains fluorine and the polymer cladding has a difference between an elasticity modulus at 60° C. and that at 23° C. equal to or smaller than 100 MPa and also has an elasticity modulus equal to or larger than 200 MPa at 23° C.

Abstract: The present invention provides an optical fiber in which the transmission loss increase is suppressed even under a high-humidity condition or under a water-immersed condition. A colored optical fiber (22) according to an embodiment of the present invention is a colored optical fiber (22) formed by applying a colored layer to an optical fiber (14) including a glass optical fiber coated with at least a double-layered coating layer of a soft layer and a hard layer, and the ratio of thermal expansion coefficient between the coating layer after the colored layer of the colored optical fiber (22) is applied and the coating layer of the optical fiber (14) before the colored layer is applied is 0.87 or more.

Abstract: Certain embodiments of the invention may include systems and methods for providing optical fiber coatings to reduce microbend losses. According to an example embodiment of the invention, a method is provided for coating an optical fiber to reduce microbend losses and polarization mode dispersion (PMD). The method includes applying a primary layer to the optical fiber, wherein the optical fiber comprises a core region surrounded by a cladding region. The method includes applying a secondary layer to the primary layer, and curing the primary and secondary layers, wherein the cured primary layer adheres to the cladding region with a minimum pullout adhesion of 6 N/cm, and the cured secondary layer has an in situ modulus of about 700 MPa to about 1200 MPa at room temperature.

Abstract: The present invention relates to an optical fiber accommodated in an optical fiber cable, and more particularly, to an optical fiber which optimizes optical fiber coating resin and color resin and restrains an increase in transmission loss of the optical fiber due to an operating environment and aged deterioration and provides an optical fiber and optical fiber ribbon without any increase of transmission loss irrespective of the operating environment and aged deterioration, and especially when exposed to water or high humidity. The optical fiber is an optical fiber coated with at least two layers of coating resin, wherein the outermost coated coating resin is a colored layer made of color resin and when the optical fiber is immersed in water which is heated to 60° C. for 168 hours, an extraction rate of the coating resin of the optical fiber is set to 1.5 mass percent or below.

Abstract: An optical fiber holding apparatus in accordance with the present invention is characterized in that the same comprises a surface in order to hold an optical fiber which is to be a state of which is rolled up so as not to overlap with each other, wherein at least the surface is formed of a thermo conductive molding body which has a thermal conductivity to be higher than or equal to 0.5 W/mK, and which has an Asker C hardness to be between twenty and fifty. Or, the same comprises a peripheral surface in order to roll up and hold an optical fiber, wherein at least the peripheral surface is formed of a thermo conductive molding body which has the thermal conductivity to be higher than or equal to 0.5 W/mK, and which has the Asker C hardness to be between twenty and fifty. Moreover, it is desirable for the thermo conductive molding body to have a compressive strength of which a peak value is between ten and thirty N/cm2 and a stabilized value is between three and ten N/cm2.

Abstract: An optical fiber is provided, which is unlikely to cause interlayer delamination between a glass optical fiber and a primary coating layer even when it is immersed in water. The optical fiber of the present invention includes a glass optical fiber 1 consisting of a core and a cladding, a primary coating layer 2 overlaid on the glass optical fiber, and a secondary coating layer 3 overlaid on the primary coating layer, wherein the relaxation modulus of the secondary coating layer is set at 400 MPa or less.