中文摘要：

对于分布反馈激光器来说，光栅的耦合系数是一个重要参数．利用改进的耦合波理论计算了具体器件结构中光栅形貌对二级光栅耦合系数的影响．在此基础上制作的器件功率达到了单面50mW，边模抑制比为36dB．

英文摘要：

Coupling coeifficient is an important parameter for distributed feedback lasers. Modified coupled-wave equations are used to calculate the effect of grating shape on coupling coefficient of the second-order gratings. Corresponding devices demonstrate that the maximum kink-free power per facet reaches 50 mW and the sidemode suppression ratio is 36 dB.