| 摘要 |
The optical transmitter according to the present invention is capable of reducing wavelength fluctuations of a semiconductor laser (laser diode) owing to the temperature dependence of the light reception sensitivity of the monitoring photodiode. The optical transmitter comprises an optical transmitting module, an LD driver, a temperature sensor, a memory, a compensation circuit, and a controller. The optical transmitting module has a laser diode and a photodiode that monitors the light from the laser diode mounted thereon. The compensation circuit obtains the parameter corresponding with the temperature of the photodiode sensed by the temperature sensor from the memory and uses the parameter to compensate the signal which is then supplied to the controller. The controller controls the driving current of the LD driver on the basis of the difference between the compensated signal and the reference level.
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