| 摘要 |
An optical transmitter comprises a laser source, and two light-intensity modulators connected in series with the laser source. The first modulator modulates an optical signal based on a data signal and a first modulation signal. The second modulator modulates an optical signal based on a clock signal and a second modulation signal. First and second bias control circuits deliver first and second modulation signals as output, respectively. The first and second bias control circuits detect the first and second modulation signals in optical signal output respectively, and control bias voltages based on the detection results. As a consequence, optimum bias voltages are always applied independently of each other to the two light-intensity modulators.
|
