The Furukawa Electric Co., Ltd.

Tunetoshi Saito

Kazutaka Nara

Kazuhisa Kashihara

Yoshinobu Nekado

Takeshi Nakajima

An optical waveguide circuit device strong in impact strength in dropping, etc. is provided. A waveguide pattern is formed on a silicon substrate in this optical waveguide circuit device. For example, this waveguide pattern has an optical input waveguide, a first slab waveguide, an arrayed waveguide including a plurality of channel waveguides having lengths different from each other and arranged side by side, a second slab waveguide, and a plurality of optical output waveguides arranged side by side. The first slab waveguide is separated on a cross separating face crossing an optical path passing the first slab waveguide. A temperature dependence in light transmission central wavelength of an arrayed waveguide grating is reduced by sliding and moving a separating slab waveguide side by a slide moving member along the separating face depending on temperature. The cross separating face and a noncross separating face communicated with this cross separating face are set to faces not conformed to a cleavage plane of the substrate.

Optical waveguide circuit device

An arrayed waveguide grating type optical multiplexer/demultiplexer of the invention eliminates the temperature dependency of the light transmission center wavelengths and suppresses an increase in insertion loss with a simple configuration even under the conditions of high temperature and high humidity. A waveguide forming area comprising an optical input waveguide, a first slab waveguide, an arrayed waveguide formed of a plurality of channel waveguides arranged side by side having a different length each other, and a plurality of optical output waveguides connected one by one is formed on a substrate. For example, the first slab waveguide is separated at crossed separation planes that cross the path of light passing through the first slab waveguide. On the crossed separation planes, a matching grease is applied. A thin film member for covering the area arranged with the matching grease is disposed to suppress the evaporation of the matching grease.

Arrayed waveguide grating type optical multiplexer/demultiplexer

An optical waveguide circuit module of the invention is a highly reliable optical waveguide circuit module where cracks are not generated in an optical waveguide circuit chip housed even under a high temperature and high humidity environment. An optical waveguide circuit chip ( ) comprises a waveguide forming region ( ) formed on a substrate ( ). The waveguide forming region ( ) has a waveguide configuration sequentially connecting optical input waveguides ( ), a first slab waveguide ( ), an arrayed waveguide ( ) made of a plurality of channel waveguides ( ) arranged side by side, the channel waveguides having a different length each other, a second slab waveguide ( ), and a plurality of optical output waveguides ( ) arranged side by side.

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Chiyoda-ku, Japan

Tunetoshi Saito