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提出了一种不对称三段周期调制光栅DFB激光器(3CPM-DFB),用于同时实现激光器高的功率输出效率和稳定的单纵模运转。采用传输矩阵法对激光器光栅结构进行了优化,以同时最大化激光器阈值增益差和前后端面功率输出不对称度。之后对优化的3CPM-DFB激光器进行了高于阈值分析,并与不对称λ/4-DFB激光器进行了比较。结果表明,两种结构激光器都受空间烧孔效应的影响,随着注入电流的增加,阈值增益差不断减小。但在5倍阈值电流下,优化的3CPM-DFB激光器归一化阈值增益差仍达到0.4,这足以保证激光器的稳定单纵模运转。另外两种激光器的P-I曲线也表明,优化的3CPM-DFB激光器有更高的输出功率效率。
An asymmetric three-segment periodic modulation grating DFB laser (3CPM-DFB) is proposed to achieve high laser output power efficiency and stable single-longitudinal mode operation. The transfer matrix method is used to optimize the laser grating structure to maximize both the laser threshold gain difference and the power output asymmetry of the front and rear facets. The optimized 3CPM-DFB laser was then subjected to a threshold above threshold analysis and compared with an asymmetric λ / 4-DFB laser. The results show that both structural lasers are affected by the hole burning effect, and the threshold gain difference decreases as the injection current increases. However, at 5 times the threshold current, the normalized threshold gain difference of the optimized 3CPM-DFB laser can still reach 0.4, which is enough to ensure stable single longitudinal mode operation of the laser. The P-I curves of the other two lasers also show that the optimized 3CPM-DFB lasers have higher output power efficiency.