L波段取样光栅分布布拉格反射(SG-DBR)激光器在高速光通信与无源光网络中具有广泛的应用前景。本文以InGaAsP作为无源波导区材料, 从理论上分析了实现L波段宽调谐SG-DBR激光器所需的关键参数, 包括前后取样光栅的反射峰间隔、取样周期、占空比等。同时采用传输矩阵模型, 讨论了取样对数与前、后取样光栅反射特性的关系。最后得到了一组优化的SG-DBR激光器参数, 其对应的调谐范围达到47.6 nm。

L-band SG-DBR lasers have wide application prospects in high-speed optical communication and passive optical networks. In this paper, using InGaAsP as the passive waveguide region material, the key parameters which are necessary to realize the wide-tuned SG-DBR laser in L-band are theoretically analyzed, including the reflection peak interval, number of sample period and duty ratio of the sampled grating. At the same time, the relationship between the sampling logarithm and the reflection characteristics of the front sampling grating(FSG) and rear sampling grating(RSG) is discussed by using the transmission matrix model. Finally, a set of optimized SG-DBR laser parameters were obtained, and the corresponding tuning range reached 47.6 nm.