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提出了一种基于电光单边带调制的前馈线宽压缩系统,该系统主要包括相位噪声检测和单边带调制两大部分。相位噪声检测部分输出一个与相位误差成比例的误差电压信号,电压信号通过线性调频作用于单边带强度调制器,实现对激光信号的调制。单边带调制器采用马赫增德尔强度调制器的结构,相当于内嵌四个相位调制器,通过相位调制达到强度调制的目的,最终得到线宽压缩的激光信号。实验针对波长为1552.52nm、功率10mW的分布反馈(DFB)半导体激光器,通过对闭环系统的搭建与仿真,激光器的线宽从原来的0.5nm减小到0.016nm,实现了对半导体激光器线宽的压窄。
A feedforward linewidth compression system based on electro-optic single sideband modulation is proposed. The system mainly consists of phase noise detection and single-sideband modulation. The phase noise detection section outputs an error voltage signal that is proportional to the phase error. The voltage signal acts on the single-sideband intensity modulator through chirping to modulate the laser signal. Single-sideband modulator Mach-Zehnder intensity modulator structure, equivalent to four embedded phase modulator, phase modulation to achieve the purpose of intensity modulation, the final linewidth compressed laser signal. Experiments on distributed feedback (DFB) semiconductor lasers with wavelength of 1552.52nm and power of 10mW are carried out. The width of the laser diode is reduced from 0.5nm to 0.016nm through the construction and simulation of the closed-loop system. Narrow.