The Furukawa Electric Co., Ltd.

Kengo Muranushi

Atsushi Yamamoto

Masayoshi Nishita

Sayoko Ibe

Tatsuya Kimoto

Noriyuki Yokouchi

Maiko Ariga

Hiroshi Takano

Toshikazu Mukaihara

Tatsuro Kurobe

Mizuki Oike

A method of controlling a wavelength of a wavelength tunable laser module includes: referring to data of measured frequencies and wavelength filter control values at two or more points for each basic frequency channel, the data being stored in a memory of a controller; selecting the basic frequency channel closest to a frequency of laser light that a laser light source is instructed to emit; calculating a first wavelength filter control value for providing the instructed frequency of laser light from the data of the measured frequencies allocated to the basic frequency channel closest to the instructed frequency and the wavelength filter control values; and controlling the transmission characteristic of a wavelength filter using the first wavelength filter control value.

Wavelength tunable laser module and method of controlling wavelength thereof

An optical modulehas a laser light source, optical branching meansfor receiving laser light from the laser light source, making a part of the laser light pass through the optical branching means and branching a remaining part of the laser light; a photodetecting portionP receiving the remaining part of the laser light branched from the optical branching meansand a packageholding therein the laser light source, the optical branching meansand the photodetecting portionP, the packagehaving stray light reducing meansandprovided therein to reduce stray light generated inside the package.

Optical module

An optical-waveguide device mounted on a fixing member having a pair of opposing upright walls and a sub-mount unit including a metallic sub-mount of a rectangular solid shape inserted between the opposing upright walls and a nonmetallic sub-mount of a rectangular solid shape mounted on the metallic sub-mount, and fixed onto a base table. The fixing member and the sub-mount unit as well as the fixing member and the base table are spot-welded together using YAG welding.

Growing community of inventors

Tokyo, Japan

Kengo Muranushi