The Furukawa Electric Co., Ltd.

Tatsuya Hatano

Hiroshi Matsuura

Daeyoul Yoon

Shingo Watanabe

Kanji Tanaka

Akira Fujisaki

Takeshi Takagi

Kazuhiro Ikeda

Kazuyou Mizuno

Mieko Yamagaki

A light input/output terminal modulecomprises a jacket tubeand a flange. A glass portionof the optical fiber is inserted in the center portion thereof. To efficiently remove the leaked light in a claddingto the jacket tube, the jacket tubeis made of silica glass or the same material as that of the cladding. The jacket tubeis fixed by fusion splicing or adhesion to the cladding so as to integrally unify the jacket tubeand the cladding. The beam diameter at the fiber end portion is enlarged by an optical component which fusion bonds the tip end of the optical fiber to the coreless fiber so that the optical power density at the light input/output terminal module is reduced.

Light input/output terminal module of the optical components and beam converting apparatus

An object is to accurately measure the Stokes parameters, without the occurrence of polarization fluctuations or PDL during the splitting of the incident light. When the incident light is made incident on a first-stage prism, the light is split into two first splitting light rays. Next, the first split light rays are respectively incident on a pair of prisms of a second stage. Each of the pair of first split light rays is split into two rays by a second-stage prism, to obtain four second split light rays.

Stokes parameter measurement device and method

A variable group delay unit has a light multiple reflector for receiving incident light and generating output light at varied output angles depending on wavelengths, a light returning part for returning the output light to the light multiple reflector, and a slit member which is provided between the light multiple reflector and the light returning part. Only light of a necessary degree is transmitted through the slit member and is reflected to a light reflecting element. A method for designing an opening width of the slit member and a method for arranging the slit member are established.

Variable group delay compensating unit and variable group delay compensating module

A variable dispersion compensator comprising: an optical incidence/output device for propagating wavelength division multiplexed light; an optical multiple reflector on which the wavelength division multiplexed light emitted from the optical incidence/output device is incident for repetitive reflections; and an optical reflection device for reflecting the wavelength division multiplexed light emitted from the optical multiple reflector toward the optical multiple reflectors, the device composed of a second lens and a reflecting element and being capable of controlling the distance from the optical multiple reflector. A temperature adjusting element and a temperature detecting element are arranged via a thermal-conductive elastic member on a surface of the optical multiple reflector at a portion where no drop occurs in the intensity of the wavelength division multiplexed light incident/emitted. The temperature of the optical multiple reflector is controlled by a controller.

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Tokyo, Japan

Tatsuya Hatano