发明授权
- 专利标题： Optical transmitter, and method of controlling bias voltage to the optical transmitter
- 专利标题（中）： 光发射机，以及控制光发射机偏置电压的方法
-
申请号： US09840183申请日： 2001-04-24
-
公开(公告)号： US06836622B2公开(公告)日： 2004-12-28
- 发明人: Tatsuya Kobayashi , Kazuyuki Ishida , Katsuhiro Shimizu , Yukio Kobayashi
- 申请人： Tatsuya Kobayashi , Kazuyuki Ishida , Katsuhiro Shimizu , Yukio Kobayashi
- 优先权： JP2000-199897 20000630
- 主分类号： H04B1004
- IPC分类号： H04B1004
摘要：
The optical transmitter comprises a light source which inputs continuous optical signal and a driving circuit which inputs driving signal to an optical modulator of Mach-Zehnder type. A photo coupler separates a part of the output of the optical modulator. A photo diode converts this part into electric signal. A band-pass filter and a pre-amplifier extract a frequency component of the driving signal contained in the electric signal. A mixer conducts synchronous detection between the driving signal and the extracted frequency component. Finally, a bias voltage control circuit controls a bias voltage based on a result of the phase comparison.