Static and Dynamic Modeling of Circular Grating-Coupled Distributed Feedback Lasers
Static and Dynamic Modeling of Circular Grating-Coupled Distributed Feedback Lasers
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DOI：
10.1109/jqe.2008.924815
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发表时间：
2008-06
影响因子：
2.5
通讯作者：
X. Li;S. Yu
中科院分区：
文献类型：
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作者：
X. Li;S. Yu
建立了一个分析圆形光栅耦合分布反馈(CGC DFB)激光器稳态和暂态响应的计算机模型。该模型采用改进的时域有限差分法对含时耦合模方程和载流子速率方程进行了自洽求解。计算中考虑了载流子浓度和折射率的非均匀分布。利用该模型研究了CGC DFB激光器的电场和载流子浓度的时空变化。结果表明，如果在计算中忽略载流子引起的折射率变化，激光器的性能将被低估。另一方面，通过对光栅的优化设计，可以同时最大化激光器的输出功率、谐振振荡频率和阻尼率。
A computer model is developed to analyze the steady-state and transient responses of circular grating-coupled distributed feedback (CGC DFB) lasers. The model solved the time-dependent coupled-mode equations and carrier rate equation self-consistently by using a modified time-domain finite-difference method. The nonuniform distributions of carrier concentration and refractive index are taken into calculation. Using the model, the temporal and spatial variations of electric field and carrier concentration of the CGC DFB lasers are examined. It is found that the laser performance would be underestimated if the carrier-induced index change is ignored in the calculation. On the other hand, it is noted that the output power and resonant oscillation frequency as well as damping rate of the lasers could be maximized simultaneously by an optimal design for the grating.