外腔激光器实现波长变换的理论及实验

Study for realizing wavelength conversion of fiber grating external cavity semiconductor laser

理论上从半导体激光器的速率方程出发,利用其增益饱和效应,提出了光纤光栅外腔半导体激光器实现波长变换的理论模型。利用此模型对入射波为高斯波时的波长变换进行了数值模拟。实验实测了光纤光栅外腔半导体激光器的波长变换前后的谱线,得到带宽 0.1nm,边模抑制比为37.9dB 的激光谱线,并且利用此波长的外腔激光器得到了波长转换间隔为 8nm 的激光谱线。理论分析和实验结果证明,光纤光栅外腔半导体激光器在实现波长变换方面具有很好的线性响应特性。

Starting with rate equation of a semiconductor laser and according to gain saturation effect, a theoretical model for realizing wavelength conversion of a Fiber Bragg Grating-External Cavity Semiconductor Laser (FBG-ECL) is proposed. Numerical simulation for wavelength conversion of the incident light with Gaussian waveform is carried out with this model. Experiments are conducted to examine the spectrum performance of FBG-ECL with different fiber grating reflectivity and perfect spectrum with 0.1 nm of bandwidth and 37.9 dB of side-mode suppression ratio is obtained, with which the wavelength conversion is achieved between the wavelength of 1541 nm and 1549 nm. Experimental results demonstrate that FBG-ECL responds to injected signal linearly during wavelength conversion.