Method for operating an optical transmission system and optical transmission system waveform shaping signal light

摘要

The present invention relates to a method, device, and system for waveform shaping of signal light. The device for waveform shaping of signal light according to the present invention includes a distributed feedback (DFB) laser having a stop band defined as the range of wavelengths allowing laser oscillation, and a drive circuit for supplying a drive current to the DFB laser so that the DFB laser oscillates at a first wavelength included in the stop band. Signal light having a second wavelength not included in the stop band is input into the DFB laser. In the case that the signal light is provided by optical pulses each having a high level and a low level, amplitude fluctuations at the high level of the signal light can be effectively suppressed by suitably setting the power of the signal light.