| 摘要 |
According to the present invention, an optical transmitting system, which enables a precise control of the power and the extinction ratio of the optical output without a small amount of the preset data, will be provided. The system comprises a laser module and a control system that supplies a bias current and a modulation current to the laser module. In the present invention, one of the bias current and the modulation current of the semiconductor laser in the laser module is varied to maintain the power and the extinction ratio of the optical output, and the other of the bias current and the modulation current is calculated based on the specific function. Only coefficients of the specific function are stored in the control system. Therefore, the present invention does not need a large size of the storage in which both the bias current and the modulation current are stored as a table.
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