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根据等效腔法和耦合模理论,研究了光纤光栅外腔半导体激光器的理论模型。讨论了光纤光栅反射率对阈值电流和输出功率的影响,说明光纤光栅反射率存在一个最佳值。耦合系数越高,等效反射率也就越大,因此提高耦合系数可以有效的增加输出功率。实验表明:前端面反射率对锁模起主要作用,随前端面反射率的减小,外腔模的作用越明显,边模抑制比越大;光纤光栅的反射率存在一个最佳值,过高或过低都会使边模抑制比变小。当注入电流为100 mA时,优化的光纤光栅外腔半导体激光器的峰值波长变化小于0.3 nm,边模抑制比大于45 dB。
According to the equivalent cavity method and coupled mode theory, the theoretical model of the fiber grating external cavity semiconductor laser is studied. The influence of FBG reflectivity on threshold current and output power is discussed, which shows that there is an optimal value for FBG reflectivity. The higher the coupling coefficient, the greater the equivalent reflectivity. Therefore, increasing the coupling coefficient can effectively increase the output power. Experiments show that the front-side reflectivity plays a major role in mode-locking. With the decrease of front-side reflectivity, the effect of outer-cavity mode is more obvious and the side-mode suppression ratio is greater. There is an optimum value for the FBG reflectivity, High or low will make side mode suppression ratio smaller. When the injection current is 100 mA, the optimized FBG cavity semiconductor laser has less than 0.3 nm peak wavelength change and more than 45 dB side mode rejection ratio.