The Furukawa Electric Co., Ltd.

Nippon Telegraph and Telephone Corporation

Masayoshi Tsukamoto

Masanori Takahashi

Ryuichi Sugizaki

Koichi Maeda

Yutaka Hoshino

Shigehiro Takasaka

Tetsuya Yasutomi

Kohei Kawasaki

Masaki Nishiguchi

Mitsuhiro Iwaya

Keiichiro Sugimoto

Shinichi Niwa

Noboru Okada

Masanobu Aragaki

Mitsuru Iwano

Yoshihisa Rintsu

Shinichi Arai

Katsuki Suematsu

Kengo Watanabe

Eiji Konda

Koichi Mizuno

Shigeo Kimura

Shigeo Kihara

The present disclosure relates to an optical connector includes at least one optical fiber; and a lens element including at least one lens that couples light to an end face of the optical fiber. The distance FLh between the end face of the optical fiber and a vertex of the lens is expressed by the sum of the distance FL from the vertex of the lens to the focal point F positioned in a back face direction of the lens and the length δ between the end face of the optical fiber and the focal point F, and the length δ is longer than 10 μm.

Optical connector and optical connector connection structure

An optical fiber bundle structure includes: plural optical fiber core wires; a crossing preventing member; and a grasping member. Further, the crossing preventing member has slits and the widths of the slits positioned at the respective sides are each equal to or larger than a difference between: a length of one side of a polygon circumscribing the plural optical fiber core wires at a hindmost end portion of the slits at the trailing end; and a length of one side of a polygon circumscribing the plural optical fiber core wires at the leading end.

Optical fiber bundle structure, optical connector, optical fiber connection structure, and method of manufacturing optical fiber bundle structure

A multicore fiber includes: n pieces of first core regions in a circular shape with a radius rthat are arranged about points Pto P, and that has a first core portion and a first cladding portion; a second core region in a circular shape with a radius Rthat is arranged about the point a, and that has a second core portion and a second cladding portion; and a cladding region that is formed on an outer circumferences of the first core region and the second core region. Further, abutting surfaces that are flat surfaces abutting on each other are formed in portions on the outer circumferences of the first core region and the second core region.

Manufacturing method of multicore fiber preform, multicore fiber preform, and multicore fiber

An optical connection component includes an optical fiber; a high relative refractive-index difference optical fiber that is fusion-spliced to the optical fiber and has a greater relative refractive-index difference to a cladding of a core than the optical fiber; and an accommodating member accommodating the entire length of the optical fiber and the high relative refractive-index difference optical fiber, and has a first end face on which an end face of the optical fiber on the side opposite to the fusion-spliced side is exposed to be substantially flush with the first end face, and a second end face on which an end face of the high relative refractive-index difference optical fiber on the side opposite to the fusion-spliced side is exposed to be substantially flush with the second end face. The optical fiber and the high relative refractive-index difference optical fiber are fixed to the accommodating member.

Optical connection component

A multi-core fiber includes: plural cores made of silica-based glass; and a cladding enclosing the plural cores and made of silica-based glass, the cladding having a refractive index lower than a maximum refractive index of the plural cores. Further, the multi-core fiber has a mode field diameter of 5.0 &#x3bc;m or larger at a wavelength of 1100 nm, the multi-core fiber provides single-mode propagation at the wavelength of 1100 nm, the multi-core fiber has a bending loss of 1 dB/turn or less at the wavelength of 1100 nm when the multi-core fiber is bent at a radius of 2 mm, and the multi-core fiber has a crosstalk between cores of &#x2212;30 dB/km or less.

Multi-core fiber

An indoor cable is composed of an optical fiber core, tension members, an outer sheath, and so forth. The optical fiber core and the tension members are integrated by the outer sheath. The outer sheath is composed of a transparent material. The optical fiber core includes a glass wire and a resin coating (a primary resin layer and a secondary resin layer). The optical fiber core does not have a colored layer that is conventionally formed on the outer periphery of the resin coating layer. That is, the optical fiber core is composed entirely of transparent materials. On both sides of the optical fiber core, separate from the optical fiber core, is arranged a pair of tension members. The tension members are composed of transparent materials.

Indoor cable used as optical fiber cable

Provided is a method for packing a cable having a static friction coefficient of 0.15 or more and 0.50 or less, a dynamic friction coefficient of 0.10 or more and 0.40 or less and a bending rigidity of 60 gf or more and 350 gf or less. The method includes the steps of: (1) winding the cable into a figure-of-eight shape to form a cylindrical cable bundle, (2) winding a wrapping film as a restraining member, which restrains the cable bundle, around an outer circumferential portion of the cable bundle, (3) winding a wrapping film as a closing member which closes openings on both ends of the cable bundle, and (4) housing the cable bundle being wound with the restraining member and the closing member in a housing container.

Method for packing cable

An optical fiber cable enabling further reduction of possibilities of disconnection of optical fiber due to, for instance, cicada oviposition. The optical fiber cable () is provided with: an optical fiber core (); a tension member (), which is arranged in parallel to the optical fiber core () on one side or on the both sides of the optical fiber core (); and a sheath () which integrally covers the optical fiber core () and the tension member (). At least one portion of the sheath () is composed of a polymeric material having a yield point stress of 12 MPa or higher.

Optical fiber cable

An optical fiber cable which is suitably set in a conduit by pushing the optical fiber cable into the conduit so as to insert the optical fiber cable through the conduit and which does not reduce the ease of manufacture and the mechanical characteristics of the optical fiber cable. The optical fiber cable includes an optical fiber cable core wire and a sheath covering the optical fiber cable core wire, wherein a dynamic friction coefficient between a surface of the sheath of the optical fiber cable and a surface of a sheath of another optical fiber cable is 0.17 to 0.34, and a dynamic friction coefficient between the surface of the sheath of the optical fiber cable and a surface of a sheet composed of polyvinyl chloride is 0.30 to 0.40.

Optical fiber cable having a sheath and for setting in a conduit

It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber, tension membersand a sheath. The sheathhas a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiberto an outer surface of the sheathof greater than 0.3 mm. Further, in the cable, the surface of sheathhas a coefficient of friction of 0.45 or less and the sheathhas a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.

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Tokyo, Japan

Masayoshi Tsukamoto