光纤光栅外腔半导体激光器频率调谐技术研究

摘要

Based on the analysis of the basic characteristics of fiber Bragg grating external cavity semiconductor laser (FBG -ECL),the frequency tuning methods for this type of lasers are investigated,including temperature tuning method and stress tuning method.The center wavelength of fiber Bragg grating is changed by the axial stress tuning method to realize the frequency tuning.The piezoelectric ceramic(PZT)was used to exert an axial stress on the grat-ing,and the amount of change in the center wavelength of the fiber Bragg grating was controlled by adjusting PZT drive voltage.The experimental results show that,for the FBG -ECL with wavelength 1550 nm,when the PZT drive voltage adds up to 126 V,tuning range can reach 100 GHz and tuning speed can reach 2 ms per cycle.%在分析了光纤光栅外腔半导体激光器（FBG －ECL）基本特性的基础上，调研了适用于该类型激光器的频率调谐方法，包括温度调谐法和应力调谐法，选取轴向应力调谐法改变光纤光栅的布拉格中心波长，进而实现频率调谐。利用压电陶瓷（PZT）来对光纤光栅施加轴向应力，通过调整 PZT 驱动电压值的大小来控制光纤光栅布拉格中心波长的变化量。实验结果表明，对于波长1550 nm 的光纤光栅激光器，当 PZT 的驱动电压增加到126 V 时，可实现0．8 nm，即100 GHz 的调谐范围以及每周期2 ms 的调谐速度。