基于遗传算法的DFB激光器驱动系统设计

Design of DFB laser driving system based on genetic algorithm

针对DFB激光器驱动电流随时间变化存在漂移和不稳定的问题,提出了基于遗传算法的DFB激光器驱动系统.该激光器驱动电源采用运算放大器深度负反馈原理来提高系统稳定性,通过引入遗传算法来消除实际驱动电流值与理论值之间的微小差异,并利用该驱动电源对中心波长为1 563.09 nm的DFB激光器进行了驱动测试.结果表明,该系统的驱动电流范围为40~80 m A,电流的波动最大值为0.62μA,电流稳定度为0.015 5%,能够实现高精度和宽范围的控制效果.

In order to solve the drift and unstability problems when the DFB laser changes with the current,a DFB laser driving sysytem based on the genetic algorithm was proposed.Through adopting the operational amplifier deep feedback theory,the system stability was enhanced with the proposed laser driving power supply.Through introducing the gentic algorithm,the micro deviation between the actual and theoretical driving current values was eliminated.With the proposed driving power supply,the driving test on a DFB laser with the center wavelength of 1 563.09 nm was performed.The results show that the driving current of the system is in the range from 40 to 80 mA,the maximuim current fluctuation is 0.62μA,and the current stability is 0.015 5%,which can realize the high precision and wide range control effect.