Line width measurement method
The laser jumper output is connected to the flange, and the power is attenuated by the tightness of the connection. The beam splitter is connected, one end of the beam splitter is fused to the 50km extension optical fiber, and the other end is connected to the AOM. The AOM gives a modulation signal, and the two beams of light enter the beam combiner to be combined into one beam and output to the PD to be converted into an electrical signal and connected to the spectrum analyzer.