相干光通信中激光源的研究

he advantage in coherent optical communication system is the increased sensitivity. To realize it, we need higher stability frequency between the sender and the receiver. It contains a optical phase lock loop in coherent optical communication, so we need narrower line-width laser diode. The paper first introduced the circuit driver of LNFE03YBE1UP, a narrow line-width DFB laser diode, and showed the frequency characteristic of the temperature and current, then introduced the test-bed to get the characteristic of the intermediate frequency with balanced pin and also come up with a new novel to reduce the fluctuation of the intermediate frequency, finally offered a set-up which consists of a Mach-Zehnder Interferometer to test the frequency fluctuation speed of the laser diode.