The Furukawa Electric Co., Ltd.

Toshihiko Ohta

Takashi Shigematsu

Takeo Shimizu

Shiro Nakamura

Hiroyuki Yamada

Takeshi Nakajima

Shu Namiki

Yoshihiro Emori

Hisaharu Yanagawa

Tsunetoshi Saito

Kanji Tanaka

Yu Mimura

Koichi Kobayashi

Jun Yamakawa

Shigehito Yodo

Toshihiro Ochiai

Toshiaki Tsuda

Koichi Takagi

Etsuo Tanabe

Masami Saito

Kazuyo Mizuno

Seiichi Imamizo

Shirou Nakamura

Shinichiro Ohta

Wavelength multiplex transmission is realized in which the temperature dependency of an EDFA is compensated for in relation to the wavelengths which are used. A first and a second long-period grating which have different periods from each other are formed in an optical fiber, ensuring that the peak wavelength of a waveform representing an optical transmission loss characteristic of the first long-period grating side is located on the shorter wavelength side than a transmission band and a peak wavelength of a waveform representing an optical transmission loss characteristic of the second long-period grating side is located on the longer wavelength side within the transmission band.

Optical component

An arrayed waveguide grating type optical multiplexer/demultiplexer including an arrayed waveguide grating having a plurality of channel waveguides. Concave end faces of input-side and output-side slab waveguides are connected to opposite ends of the diffraction grating. At least one input waveguide and at least one output waveguide are connected to the other concave end faces of the input-side and output-side slab waveguides, respectively. The focal length of the output-side slab waveguide end face is longer than the focal length of the input-side slab waveguide end face. The optical multiplexer/demultiplexer has a sufficiently flat wavelength-dependent spectrum response in passing channel spacings, and helps construct an optical wavelength multiple communication system having a good signal-to-noise ratio.

Arrayed waveguide grating type optical multiplexer/demultiplexer

A plate-shaped member ( ) whose linear expansion coefficient is larger than that of a substrate ( ) is provided on the rear side of the substrate ( ) of an arrayed waveguide diffraction grating ( ) which divides, by a diffraction effect of an array waveguide ( ), lights of a plurality of wavelengths from those having a plurality of wavelengths different from each other, which are inputted from an optical input waveguide ( ), and outputs these lights from the respective optical output waveguides ( ). A light transmission feature of the respective output lights includes a light transmission feature for causing lights to be transmitted, centering around the center wavelengths of light transmission, which are different from each other, wherein the center wavelengths of light transmission shifts to the long wavelength side by a temperature rise.

Optical waveguide circuit, and method for compensating the light transmission wavelength

An optical waveguide component which has end faces to be connected with optical fiber connectors by means of guide pins, comprises an optical waveguide component body having an optical waveguide core portion, and a resin mold cladding portion covering all the faces of the optical waveguide component body except for the end faces of the optical waveguide component body. Each end face of the resin mold portion has guide pin holes which were formed with the optical waveguide core portion being used as a positioning reference. Since the guide pin holes for connection with the optical fiber connectors are formed in the resin mold portion which, preferably has some elasticity and which covers the optical waveguide component body, the guide pin holes and a substrate are not broken even if subjected to a load after connection.

Optical waveguide component with a molded resin portion having

Method of connecting optical waveguide and optical fiber

A method for stacking ferrules of a stacked-type optical connector wherein stacking portions for stacking are provided in corresponding positions of each ferrule, the individual ferrules are stacked with the corresponding individual stacking portions aligned, and a plurality of ferrules are simultaneously stacked up with stacking members which work in cooperation with those corresponding stacking portions in such a manner that the ferrules can practically float with a specific degree of freedom to allow a gap between the ferrules, and a stacked-type optical connector assembled according to this method.

Method for stacking ferrules of a stacked-type optical connector and a

Disclosed in an optical switching connector provided with a first and second ferrule disposed with end faces thereof abutting on each other and two reference pins disposed in parallel at a predetermined interval. The first and second ferrules have two parallel pin holes, respectively. The two reference pins are inserted in the pin holes. The pin holes have an elongated sectional shape enabling the reference pins to move laterally by exactly a certain movement pitch. The first and second ferrules are able to be positioned at one position determined by one of the inside surfaces of the pin holes being pressed against the reference pins and another position determined by the other inside surfaces of the pin holes being pressed against the reference pins. One of the first and second ferrules has fixed in it two or more optical fibers at a pitch of 1/n (n being a positive integer) of the above-mentioned certain movement pitch, while the other ferrule has fixed in it one or more optical fibers so to correspond with all or part of the same.

Optical switching connector

Growing community of inventors

Tokyo, Japan

Toshihiko Ohta