3段式集成DFB激光器微波信号仿真

Simulation of microwave signal generation based on three-section monolithic integrated DFB laser

为研究集成激光器生成微波信号特性,基于光注入法设计面向微波信号生成的3段式单片集成分布反馈二极管激光器(distributed feedback laser diode,DFB-LD).基于麦克斯韦-布洛赫模型,构建DFB-LD的行波速率方程组,并搭建基于多段式单片集成激光器的仿真系统,研究3段式生成微波的时序、光谱及频谱特性,分析激光器偏置电流、波导偏置电流及波导失谐量对微波信号特性的影响.仿真结果表明,频谱在激光器偏置电流达到阈值电流的6倍时不再存在拍频分量,微波频率随着波导偏置电流的增大基本保持不变,通过调节波导失谐量可对微波信号实现14.29 GHz的调谐范围.研究结果为集成半导体器件产生微波信号提供新思路和方法.

In order to simulate the characteristics of microwave signal generated by integrated laser,we design the laser structure of three-section monolithic integrated distributed feedback semiconductor laser diode(DFB-LD)for microwave signal generation based on the optical injection method.On the basis of Maxwell-Bloch s mathematical model,we construct the traveling wave equations of DFB-LD and set up a multi-section monolithic integrated laser simulation system.Then we study the characteristics of the time series,optical spectra and frequency spectra for the generated microwave signal and analyze the effect of the bias current of the DFB laser on the right-hand,the bias current of the waveguide and the waveguide bandgap detuning on the characteristics of the microwave signals.The simulation results show that there is no beat component in the frequency spectrum when the bias current of the laser reaches 6 times of the threshold current,the microwave frequency remains unchanged with the increase of the waveguide bias current,and the tuning range of 14.29 GHz can be achieved by adjusting the waveguide detuning.This research provides a new idea and method for the generation of microwave signals by integrated semiconductor devices.