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基于耦合模理论,分析了二阶光栅分布反馈(DFB)激光器的综合出光特性,包括阈值增益、光子密度分布、外微分量子效率等。数值计算结果表明,对于波长为1.55μm的给定结构器件,二阶光栅占空比对其出光特性影响较大。最后得到优化的光栅占空比为0.43,优化后,腔内光子密度分布均匀,边模抑制比达35 dB,外微分量子效率达47%。
Based on the coupled-mode theory, the integrated light output characteristics of a second-order grating distributed feedback (DFB) laser are analyzed, including threshold gain, photon density distribution and external differential quantum efficiency. Numerical results show that for a given wavelength of 1.55μm for a given device, the second-order grating duty cycle has a greater impact on its light output characteristics. Finally, the optimized grating duty cycle is 0.43. After optimization, the cavity photon density distribution is uniform, the side mode suppression ratio is up to 35 dB, and the outer differential quantum efficiency reaches 47%.