Nippon Telegraph and Telephone Corporation

Oki Electric Industry Co., Ltd.

Ken-ichi Yukimatsu

Ryo Nagase

Masao Kawachi

Akira Himeno

Kuniharu Kato

Kiyoshi Kurosawa

Jiro Utsunomiya

Toshiyuki Kawashima

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

Sayama, Japan

Ken-ichi Yukimatsu