Abstract: An optical fiber comprises a glass portion comprising a core and a cladding surrounding the core, and, a resin portion comprising a non-removable resin layer tightly covering the glass portion and comprising an ultraviolet curing resin and a buffer layer covering the non-removable resin layer and comprising an ultraviolet curing resin. A diameter of the core falls within a range from 20 ?m or larger to 80 ?m or smaller, and an outer diameter of the non-removable resin layer falls within a range from 120 ?m or larger to 127 ?m or smaller. In this optical fiber, when flexural rigidity of the glass portion is EI(g) and flexural rigidity of the resin portion is EI(r), EI(g)?EI(r) is satisfied.

Abstract: An optical fiber cable comprises a plurality of optical fibers, tensile strength fibers that accommodate the plurality of optical fibers, and a sheath formed with a thermoplastic resin and covering the tensile strength resin. In this optical fiber cable, when a Young's modulus of the sheath at 0° C. is E [MPa], a cross-sectional area of the optical fiber cable is S [mm2] and an inner diameter of the sheath of the optical fiber cable is Di [mm], ES (0° C.) [N] which is the product of the Young's modulus E at 0° C. and the cross-sectional area S, and the inner diameter Di [mm] satisfy: ES ? ( 0 ? ° ? ? C .

Abstract: The present invention relates to an optical fiber and an optical cable which can be used for a long term even under environments in which an oil content migrates into them, and the optical fiber has a glass fiber extending along a predetermined axis, and a coating. The coating is composed of a plurality of layers each of which is comprised of an ultraviolet curable resin or a thermosetting resin, and swelling rates of the respective coating layers are set so that they increase from an outer peripheral surface of the glass fiber to an outer peripheral surface of the cable jacket.

Abstract: An optical fiber 1 comprising a core layer 2 composed of a silica based glass, a clad layer 3 formed on the outer circumference of the core layer 2 by curing a curable resin composition, and an ink layer 4 formed around the clad layer 3, wherein adhesive force between the core layer 2 and the clad layer 3 being from 1.5 g/mm to 4.0 g/mm.

Abstract: The stranded optical cable 10 includes a plurality of stranded multicore optical cables 12 and a cable sheath 16 covering the multicore optical cables 12, each multicore optical cable 12 including at least two of optical units 13 as a pair and a unit sheath 14 covering the optical units 13, each optical unit 13 being formed by bundling a plurality of optical fibers. And, parts of the cable sheath corresponding to both ends of the stranded optical cable 10 are removed to expose the multicore optical cables 12 certain lengths so that the optical connectors 21 are connected to the multicore optical cables 12, respectively.

Abstract: A connector assembly capable of efficiently dissipating heat is provided. The connector assembly includes: an optical cable; and a connector module, and the optical cable includes an optical fiber core wire, an outer cover provided around the optical fiber core wire, and a metallic braid provided between the optical fiber core wire and the outer cover, and the connector module includes a housing defining a space, and a circuit board received in the space of the housing and mounted with a photoelectric conversion unit connected with the optical fiber core wire, and the metallic braid of the optical cable and the circuit board of the connector module are thermally connected to each other.

Abstract: A multi mode optical fiber includes a core having a refractive index distribution of a curved form, a central part in a radial direction of which protrudes, a cladding provided in the periphery of the core and having a constant refractive index lower than a refractive index of the core and a trench layer provided between the core and the cladding and having a constant refractive index lower than that of the cladding. A width dimension of the trench layer in the radial direction is set to 2 ?m or smaller and a ratio of an absolute value of ? trench that is a refractive index difference between the cladding and the trench layer to an absolute value of ? core that is a maximum refractive index difference between the cladding and the core is set to 0.5 or larger.

Abstract: An optical fiber comprises a glass portion comprising a core and a cladding surrounding the core, and, a resin portion comprising a non-removable resin layer tightly covering the glass portion and comprising an ultraviolet curing resin and a buffer layer covering the non-removable resin layer and comprising an ultraviolet curing resin. A diameter of the core falls within a range from 20 ?m or larger to 80 ?m or smaller, and an outer diameter of the non-removable resin layer falls within a range from 120 ?m or larger to 127 ?m or smaller. In this optical fiber, when flexural rigidity of the glass portion is EI(g) and flexural rigidity of the resin portion is EI(r), EI(g)?EI(r) is satisfied.

Abstract: An optical fiber cable comprises a plurality of optical fibers, tensile strength fibers that accommodate the plurality of optical fibers, and a sheath formed with a thermoplastic resin and covering the tensile strength resin. In this optical fiber cable, when a Young's modulus of the sheath at 0° C. is E [MPa], a cross-sectional area of the optical fiber cable is S [mm2] and an inner diameter of the sheath of the optical fiber cable is Di [mm], ES (0° C.) [N] which is the product of the Young's modulus E at 0° C. and the cross-sectional area S, and the inner diameter Di [mm] satisfy: ES ? ( 0 ? ° ? ? C .

Abstract: An optical cable comprises a coated optical fiber having an optical fiber which includes a core made of glass and a cladding surrounding the core and a jacket made of a thermoplastic resin. The jacket is directly covering the coated optical fiber while in close contact therewith. In the optical cable, the optical fiber has the highest modulus of elasticity in materials constituting the optical cable, a glass diameter of the optical fiber is at least 30 ?m but not more than 200 ?m while being 5% or less of a cable diameter of the optical cable, and a distortion occurring in the optical fiber when bending the optical cable by 180° is 6% or less.

Abstract: An optical fiber with a ferrule, includes an optical fiber having a core part and a cladding part, and a ferrule to which an end of the optical fiber is fixed. The ferrule is formed integrally to the optical fiber and a resin constructing the ferrule directly abuts on the optical fiber.

Abstract: An optical cable includes an optical fiber ribbon core wire provided with an optical fiber having a core and a cladding that surrounds the core, a sheath that surrounds the optical fiber ribbon core wire, and a braid arranged inside the sheath. The braid is formed to include wires woven with each other. In the optical cable, the wire that forms the braid is pushed into the sheath so that the sheath is integrated with the braid.

Abstract: An optical cable comprises an optical fiber ribbon, a tension member and a sheath. The optical fiber ribbon is constructed by integrating a plurality of optical fibers arranged in parallel. The sheath is provided so as to surround the optical fiber ribbon. The sheath is used for protecting the optical cable. One optical fiber ribbon is arranged twistably within an inner space surrounded by the sheath.

Abstract: The present invention relates to an optical fiber and an optical cable which can be used for a long term even under environments in which an oil content migrates into them, and the optical fiber has a glass fiber extending along a predetermined axis, and a coating. The coating is composed of a plurality of layers each of which is comprised of an ultraviolet curable resin or a thermosetting resin, and swelling rates of the respective coating layers are set so that they increase from an outer peripheral surface of the glass fiber to an outer peripheral surface of the cable jacket.

Abstract: An optical fiber ribbon 11 includes a plurality of optical fibers 12 which are formed of glass fibers 13 covered with resin layers 14, and arranged in parallel. The optical fibers 12 are covered with connecting material 15 to be integrated into the optical fiber ribbon 11. A peeling strength of the connecting material 15 with respect to outer peripheral faces of the optical fibers 12 is set to be from 0.1 N/mm to 10 N/mm.

Abstract: The present invention relates to an optical fiber and an optical cable which can be used for a long term even under environments in which an oil content migrates into them, and the optical fiber has a glass fiber extending along a predetermined axis, and a coating. The coating is composed of a plurality of layers each of which is comprised of an ultraviolet curable resin or a thermosetting resin, and swelling rates of the respective coating layers are set so that they increase from an outer peripheral surface of the glass fiber to an outer peripheral surface of the cable jacket.

Abstract: The present invention relates to an optical fiber and an optical cable which can be used for a long term even under environments in which an oil content migrates into them, and the optical fiber has a glass fiber extending along a predetermined axis, and a coating. The coating is composed of a plurality of layers each of which is comprised of an ultraviolet curable resin or a thermosetting resin, and swelling rates of the respective coating layers are set so that they increase from an outer peripheral surface of the glass fiber to an outer peripheral surface of the cable jacket.

Abstract: An optical fiber includes a core, a clad and a coating layer. The core is made of glass, has a higher refractive index than that of the clad, and can guide propagating light. The clad surrounding the core is made of glass or plastic. The coating layer surrounding the clad is made of plastic. The core has a diameter d1 of from 70 to 105 ?m. The clad has a diameter d2 of from 80 to 130 ?m. The glass has a diameter of from 70 to 130 ?m. The coating layer has a thickness t3 of from 12.5 to 85 ?m. The optical fiber has an effective numerical aperture NA of from 0.28 to 0.35. The optical fiber of this embodiment has a transmission loss of 20 dB/km or smaller and a transmission bandwidth of 40 MHz·km or larger at an 850-nm wavelength.

Abstract: An optical-electrical composite cable 1A includes a ribbon optical fiber 10 including a plurality of optical fibers, a tube 20 accommodating the ribbon optical fiber 10, a sheath 50 covering the tube 20, and a plurality of electric wires 60 arranged between an outer surface of the tube 20 and an inner surface of the sheath 50. A center axis line of the tube 20 and a center axis line of the sheath 50 are apart from each other. The center axis line of the sheath 50 is located inside the tube 20. The plurality of electric wires 60 is located eccentrically on an opposite side to the center axis line of the tube 20 with respect to the center axis line of the sheath 50. Such a configuration provides an optical-electrical composite cable that has an even smaller diameter.

Abstract: The present invention relates to a multimode optical fiber provided with a region where a refractive index in a peripheral region of a core has deviation from an ideal shape of an ?-power refractive-index profile and where an absolute value of an amount of the deviation is not less than 0.005%, so as to generate radiation modes, and a refractive index of a cladding is higher than that of the deviation region.