Nippon Telegraph and Telephone Corporation

Oki Electric Industry Co., Ltd.

Toshiyuki Kawashima

Ryo Nagase

Masao Kawachi

Akira Himeno

Kuniharu Kato

Kiyoshi Kurosawa

Jiro Utsunomiya

Ken-ichi Yukimatsu

Masayuki Okyno

Iida Saburo

An optical switching module has an optical waveguide substrate mounted on an electronic circuit substrate. According to a first aspect of the invention, the optical waveguide substrate has thin-film heaters, and the electronic circuit substrate has trimmable thick-film resistors for adjusting current fed to the thin-film heaters. According to a second aspect of the invention, the optical switching module also has a pair of fiber pigtails butt-coupled to the optical waveguide substrate. The fiber pigtails are secured to the ends of a supporter, which is attached to a heat sink fastened below the electronic circuit substrate. According to a third aspect of the invention, the optical waveguide substrate is mounted in a depression in the electronic circuit substrate. The invention reduces the size of the optical switching module.

Compact optical switching module including thin-film heaters and trimmed

Growing community of inventors

Tokyo, Japan

Toshiyuki Kawashima