基于速率热方程的垂直腔面发射激光器L-I模型优化

L-I Model Optimization of Vertical Cavity Surface Emitting Laser Based on the Rate Equation

激光器作为光纤通信系统的核心器件之一,研究其性能特征对超高速光纤通讯发展具有显著的现实意义,其中垂直腔面发射激光器(VCSEL)因具有使用简单、功耗较低等特点而被广泛应用.经典的L-I模型建立了VCSEL输出的光功率强度和器件温度之间的关系,利用遗传算法得到了模型参数的优化值,随后通过对偏置电流进行指数展开改进了经典的L-I模型.结果表明:偏置电流对L-I模型影响较大;随着电流的增加,光功率的增长速度逐渐降低;改进后的指数展开模型比传统L-I模型更好地拟合了实验数据.

As one of the core devices in optical fiber communication system, the study of its performance characteristics has remarkable significance in reality for the development of ultra-high speed optical fiber communication. The vertical cavity surface emitting laser （VCSEL） with the characteristics of simple use and low power consumption is widely used. The classical L-I model is established in the relationship between the optical power intensity of the VCSEL output and the device temperature. In this paper, the optimal values of the model parameters by using genetic algorithms are obtained and then the classical L- I model by exponentially expanding the bias current is improved. The results show that the bias current has a great influence on the L-I model. With the increase of the current, the speed of optical power decreases gradually. The improved exponential expansion model is more advanced and practical than the traditional L-I model.