Hitachi Cable, Inc.

Ntt Communications Corporation

Advanced Cable Systems Corp.

Toshihiko Ishikawa

Kanako Suzuki

Masao Tachikura

Seiji Kojima

Kazumasa Ohsono

Masaru Ishikawa

Yoshikazu Namekawa

Kojiro Ito

Yoshihiro Nakatani

Noribumi Shiina

Takao Nishikawa

Kyoji Osozawa

Motoyoshi Nakamura

Tetsuya Sueoka

An optical fiber that has no bubbles in the ultraviolet ray curable resin filled inside the air holes to seal the end parts thereof, an end part processing method of the optical fiber, and an end part processing apparatus of the optical fiber, are provided. In an end part processing method of an optical fiber that is comprised of a core and a cladding formed around the core, the cladding having a refraction index lower than that of the core and has a plurality of air holes formed therein along the axis of the core, wherein the end part process of the optical fiber is to form sealed portions on the ends of the air holes by sealing them with ultraviolet ray curable resin, the method is characterized in that the sealed portion is formed by heating the end of the optical fiber.

Optical fiber, end part processing method of optical fiber, and end part processing apparatus of optical fiber

A communication light detecting device interconnecting light transmission paths and collocated therebetween, comprises: an optical coupling body including a core portion for photo coupling with the light transmission paths, and a light extracting portion for extracting a part of the communication light as a leakage light; and a light detecting portion having a light receiving member for receiving the leakage light. The light extracting portion is preferable to possess a lower refractive index than that of the core portion. Besides, the light extracting portion is preferable to include a light detecting use groove with a groove width of 50 &#x3bc;m or more and 140 &#x3bc;m or less formed by cutting and separating the core portion. Besides, the light extracting portion is preferable to be the optical coupling body in which outer diameter of the core portion is different from the outer diameter of a core of the light transmission path.

Communication light detecting device

Growing community of inventors

Hitachi, Japan

Toshihiko Ishikawa