Study on a DFB Laser Diode Based on Sampled Grating Technique for Suppression of the Zeroth Order Resonance
Study on a DFB Laser Diode Based on Sampled Grating Technique for Suppression of the Zeroth Order Resonance
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DOI：
10.1109/jphot.2017.2686430
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发表时间：
2017-03
影响因子：
2.4
通讯作者：
Lianyan Li;Yue-chun Shi;Yunshan Zhang;H. Zou;Jianping Shen;Xiangfei Chen
中科院分区：
文献类型：
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作者：
Lianyan Li;Yue-chun Shi;Yunshan Zhang;H. Zou;Jianping Shen;Xiangfei Chen
一种基于多段取样光栅的分布反馈（DFB）半导体激光器，提出了直的、弯曲的和倾斜的波导来抑制$0{\rm{th}}$阶谐振。设计了一种具有非线性等效啁啾图案的取样结构，以补偿弯曲和倾斜波导引入的光栅基本啁啾。由于倾斜波导的存在，也可以减小端面反射，避免端面随机相位的影响。结果表明，即使在较大的采样周期下，$ - 1{\rm{st}}$阶子光栅也具有良好的单纵模特性和较高的波长精度。由于激光波长可以通过一个采样周期进行调节，且制作精度要求较低，这将有利于实现低成本的具有良好SLM特性和精确激光波长的DFB激光器阵列。
A distributed feedback (DFB) semiconductor laser based on sampled grating with multiple sections, i.e., a straight, a bent, and a tilted waveguide, is proposed to suppress the $0{\rm{th}}$ -order resonance. A sampling structure with nonlinear equivalent chirp pattern is carefully designed to compensate the basic grating chirp introduced by the bent and tilted waveguide. The facet reflection can also be reduced due to the tilted waveguide to avoid the influence of random facet phase. As a result, good single longitudinal mode (SLM) property and high wavelength accuracy in the $ - 1{\rm{st}}$-order subgrating is achieved, even with a large sampling period. Because the lasing wavelength can be easily adjusted by a sampling period and the fabrication accuracy requirement is relaxed, it will benefit the realization of low-cost DFB laser arrays with a good SLM property and accurate lasing wavelength.