发明授权
- 专利标题: Automatic bias control method and apparatus for optical transmitter
- 专利标题(中): 光发射机自动偏置控制方法及装置
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申请号: US13934722申请日: 2013-07-03
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公开(公告)号: US08977119B2公开(公告)日: 2015-03-10
- 发明人: Meng Yan , Zhenning Tao
- 申请人: Fujitsu Limited
- 申请人地址: JP Kawasaki
- 专利权人: Fuijtsu Limited
- 当前专利权人: Fuijtsu Limited
- 当前专利权人地址: JP Kawasaki
- 代理机构: Staas & Halsey LLP
- 优先权: CN201210230521 20120704
- 主分类号: H04B10/08
- IPC分类号: H04B10/08 ; H04B10/564 ; H04B10/50
摘要:
The embodiments provide an automatic bias control method and apparatus for an optical transmitter. The apparatus includes: a detecting unit configured to monitor output optical power of an I/Q modulator of the optical transmitter; a calculating unit configured to calculate bias voltage indicating values of the I modulator, Q modulator and phase modulator of the I/Q modulator according to the output optical power and known modulation data; and an adjusting unit configured to adjust respectively Direct-Current (DC) bias voltages of the I modulator, Q modulator and phase modulator according to the bias voltage indicating values of the I modulator, Q modulator and phase modulator. With the embodiments, known modulation data are used to realize automatic bias control by monitoring the evenness of distribution of the power of output optical signals of the transmitter in the four quadrants of an I/Q plane.
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