| 摘要 |
The invention relates to a control method and a control circuit for a laser diode transmitter. The control circuit comprises a monitoring photo diode means (PD) for detecting a portion of an optical output signal of the laser diode transmitter (LD) and generating a monitor signal (4a) representing said optical output signal. In the invention, the control circuit further comprises a peak level detector means (6, 7) for detecting the peak level of the monitor signal (4a) and the peak level of a data signal to be transmitted, first control means (2, 9) for controlling the peak level of the optical output of the laser diode transmitter (LD) on the basis of a difference between said peak levels detected by the peak level detector means (6, 7), mean level detector means (5, 8) for detecting the mean level of the monitor signal (4a) and the mean level of the data signal to be transmitted, and second control means (3, 10) for controlling the mean level of the output of the laser diode transmitter (LD) on the basis of a difference between said mean levels detected by the mean level detector means (5, 8).
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