OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION SYSTEM COMPRISING THE SAME

摘要

An optical transmitter having a structure capable of effectively suppressing nonlinear optical phenomena, especially the SBS and outputting high-power signal light. The transmitter comprises a modulated signal source for outputting modulated signal light modulated with a frequency of 20 kHz or less, a semiconductor laser light source for outputting laser light the amplitude of which is modulated with the modulated signal from the modulated signal source, an optical amplifier for amplifying the laser light from the semiconductor laser source, and a modulation coefficient adjusting system for adjusting the ratio of the amplitude modulation coefficient of the laser light from the semiconductor laser light source to the amplitude modulation coefficient of the amplified laser light outputted from the optical amplifier. Specifically, the modulation coefficient adjusting system adjusts the modulation coefficient of the amplified laser light to 60% or less of the modulation coefficient of the laser light inputted to the optical amplifier. An optical transmission system comprising such an optical transmitter is also disclosed.