Nippon Electric Glass Co., Ltd.

Satoru Yoshihara

Takahiro Matano

Takashi Nakamura

Akihiko Sakamoto

Mitsuo Asai

Takehiro Shibuya

Hitoshi Uehara

Takao Yamamuro

Keiichi Kawanabe

The optical communication device substrate according to the present invention includes one of ceramic and glass ceramic each having an average thermal expansion coefficient of &#x2212;55 to &#x2212;120&#xd7;10&#xb0;/C. in the temperature range of &#x2212;40 to +100&#xb0;C. and each containing one of a &#x3b2;-quartz solid solution and a &#x3b2;-eucryptite solid solution as a main crystal. In the substrate, maximum thermal expansion hysteresis that occurs when temperature rise from &#x2212;40&#xb0;C.to 100&#xb0;C. at a rate of 1&#xb0;C./min and temperature lowering from &#x2212;100&#xb0;C.to &#x2212;40&#xb0;C. at a rate of 1&#xb0;C./min are performed is less than 12 ppm.

Substrate for optical communication device, method for production thereof and optical communication device using the same

An optical communication device substrate made of ceramic or glass-ceramic having a negative thermal expansion coefficient in the range of &minus;10 to &minus;120&times;10 /&deg; C. in a temperature range of &minus;40 to 100&deg; C., treated with a solution containing at least one organic silicon compound selected from the group consisting of siloxane compounds and silazane compounds.

Optical communication device substrate and optical communication device

Bioactive cement

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Otsu, Japan

Satoru Yoshihara