Asahi Glass Company, Limited

Kabushiki Kaisha Topcon

Yoshinobu Takano

Susumu Saito

Hiroshi Yamamoto

Toshiyuki Tanaka

Takashi Takahashi

Tetsuji Shimohira

Norihide Sugiyama

Seigo Kotera

Naoto Ota

Nobuo Hori

Shigenori Nagano

Nobuyuki Kasahara

Masakuni Sato

Yoshitaka Matsuyama

Reiji Hashimoto

To provide a plastic optical fiber using amorphous fluorinated polymers whereby transmission loss and bending loss are low, no cracking takes place during stretching, and a wide range of molding conditions is acceptable. A plastic optical fiber comprising an inner layer, an outer layer having a refractive index lower than the refractive index of the inner layer, and a protective coating layer covering the outer periphery of the outer layer, wherein the inner layer contains an amorphous fluorinated polymer (a) having no C&#x2014;H bond, the outer layer contains an amorphous fluorinated polymer (c) which may have a C&#x2014;H bond only at a terminal of the main chain, the glass transition temperature (Tgc) of the fluorinated polymer (c) is at least the glass transition temperature (Tga) of the fluorinated polymer (a), the plastic optical fiber is a stretched one, the fracture elongation of the fluorinated polymer (a) and the fracture elongation of the fluorinated polymer (c) are at least 120% and larger than the stretching ratio.

Plastic optical fiber and method for its production

A method for coupling plastic optical fibers and a plastic optical fiber unit are provided by providing a holder, which includes a groove for holding plastic optical fibers in a longitudinal direction; and abutting and coupling opposed end faces of the plastic optical fibers together while causing the holder to apply a lateral pressure to the plastic optical fibers therein to sandwich the plastic optical fibers.

Method for coupling plastic optical fibers

To provide an optical fiber cable having a plurality of GI-POFs and a resin cable body confining these, and excellent in the thermal durability, pressure resisting property and flexural mechanical property, wherein the increase of the attenuation of the light is suppressed. The resin cable body has as many holes as the number of the GI-POFs, extending longitudinally therethrough, and the GI-POFs are distributed and arranged one by one in the holes so that they are freely movable in two directions perpendicular to the longitudinal direction.

Optical fiber cable including freely movable plastic optical fibers

Method of joining plastic optical fibers to each other

A method of patterning an optical device for an optical IC whose purpose is to diffract a light beam incident on one surface of a device substrate to cause a light beam to emerge from another surface of the device. In this method, a layer of a substance of variable refractive index is formed on an optical substrate, coherent light is caused to irradiate the layer from the direction of the normal to the surface which will be the incidence side of the device when it is used or from the opposite side, and coherent light is caused to irradiate the layer from the direction of the normal to the surface which will be the emergence side of the device when it is used or from the opposite side to form an interference pattern on the layer that performs diffraction.

Method for patterning an optical device for optical IC, and an optical

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Kanagawa, Japan

Yoshinobu Takano