Dark pulse fiber laser

A dark pulse fiber laser consists of a semiconductor optical amplifier, an optical circulator, a band-pass filter, a single-mode fiber, a 50:50 coupler, a 20:80 coupler, an optical isolator and a polarization controller which are connected to one another through optical fibers so as to form two closed loops. By the dark pulse fiber laser, laser light in a resonant cavity is subjected to cross gain modulation and cross phase modulation through fed back laser light, and dark pulses can be generated. The dark pulse fiber laser has the advantages that the dark pulse fiber laser is simple in structure and low in cost, a pulse width tuning range is large, the dark pulse fiber laser can work at normal temperature, and the application prospect on the aspect of signal processing is high.