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采用射线法,计及增益随波长的变化,导出了光纤光栅外腔半导体激光器输出谱及输出功率的表达式。结合载流子速率方程,对外腔半导体激光器的输出谱的精细结构以及P-I特性进行了数值模拟研究。结果表明:光纤光栅外腔的输出谱在反射带宽内呈现出多峰结构,随着前端面反射率越小,输出谱相应地比较稳定;P-I特性曲线抖动越来越小,趋于线性变化。
The expression of output spectrum and output power of fiber grating external cavity semiconductor laser was deduced by using the ray method, considering the variation of gain with wavelength. Combined with the carrier rate equation, the fine structure of the output spectrum of the external cavity semiconductor laser and the P-I characteristics are numerically simulated. The results show that the output spectrum of the FBG outer cavity shows a multi-peak structure within the reflection bandwidth. With the reflectivity of the front face smaller, the output spectrum is relatively stable. The P-I characteristic curve jitter becomes smaller and smaller and tends to change linearly.