发明授权
- 专利标题: Optical modulator
- 专利标题(中): 光调制器
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申请号: US891785申请日: 1997-07-14
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公开(公告)号: US5963357A公开(公告)日: 1999-10-05
- 发明人: Yoshinobu Kubota , Yasuhiro Omori , Toshihiro Otani , Tomoyuki Itoh
- 申请人: Yoshinobu Kubota , Yasuhiro Omori , Toshihiro Otani , Tomoyuki Itoh
- 申请人地址: JPX Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX9-028208 19970212
- 主分类号: G02F1/03
- IPC分类号: G02F1/03 ; G02F1/01 ; G02F1/225 ; G02F1/035
摘要:
An optical modulator for modulating light emitted from a signal light source has a substrate having electrooptic effect, an optical waveguide of a Mach-Zehnder type formed on the substrate, an electrode formed on the substrate to control light propagated in the optical waveguide, an interference light generating means for making radiation light radiated from the optical waveguide and signal light leaking from the optical waveguide interfere with each other to generate interference light, and emitting the interference light from an end surface of the substrate, a photo-detector for monitoring the interference light of the radiation light and the signal light, and a signal controlling circuit for controlling an operating point of the optical modulator according to a change of the interference light monitored by the photo-detector It is thereby possible to prevent degradation of a distinction ratio due to a shift of the operating point of the optical modulator so as to allow stable optical modulation, while facilitating a design of the mechanism of the optical modulator.