Light from the laser goes through the optical circulator, and is divided into the sample and reference arm by the fiber coupler.
激光器发出的光通过光环行器，被光纤耦合器分成样品臂和参考臂。
2
A compact, low input power optical bistable device, combined with photodetector and optical fiber directional coupler and semiconductor laser diode, was presented.
The focus is given to the influence of pumping power, cavity length, the output coupler transmission and initial transmission on the repetition rate, pulse width and output power of laser output.