DFB半导体激光器中增益耦合型光栅结构的优化  

Optimization of Gain-Coupling Grating Structure in DFB Semiconductor Lasers

作　　者：李嘉恒[1] 余建国[1] 陈远祥 李依桐[1] 王任凡 罗飚 LI Jia-heng;YU Jian-guo;CHEN Yuan-xiang;LI Yi-tong;WANG Ren-fan;LUO Biao(School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;Wuhan Telecommunication Device Co. , Ltd. , Wuhan 430074, China)

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]武汉电信器件有限公司,武汉430074

出　　处：《光通信研究》2018年第3期28-31,共4页Study on Optical Communications

基　　金：国家“八六三”计划资助项目(2015AA016901)

摘　　要：分布反馈（DFB）半导体激光器具有结构简单、频谱稳定等优点,在光通信领域具有十分广泛的应用。DFB激光器在大电流条件下容易产生空间烧孔效应,会导致单模特性不稳定。为了抑制空间烧孔效应,文章采用三相移以及节距调节（CPM）与分布耦合系数（DCC）相结合的CPM-DCC光栅结构对增益耦合系数进行优化。一方面从理论上进行分析,推导出了增益耦合系数的最优值;另一方面从仿真和实验上验证了理论的正确性。结果表明,DFB激光器的阈值电流约为11 mA,边模抑制比达到41dB,显著抑制了空间烧孔效应,极大地提高了激光器阵列的线性指标。Distributed Feedback（DFB）semiconductor lasers have the advantages of simple structure and stable spectrum,which have been widely used in optical communication field.DFB lasers in the high current conditions are prone to space burning hole effect,which will lead to single-mode characteristics of instability.In order to suppress the effect of space burning,this paper uses three-phase shift and CPM-DCC grating structure combined with Corrugation-Pitch-Modulation（CPM）and Distributed-Coupling-Coefficient（DCC）.The coefficients are optimized.On the one hand,theoretically,the optimal value of the gain coupling coefficient is deduced.On the other hand,the correctness of the theory and the simulation are proved from the simulation and experiment.The results show that the threshold current of DFB laser is about 11 mA,and the side mode rejection ratio is 41 dB,which significantly suppresses the effect of space burning hole and greatly improves the linearity of laser array.

关 键 词：烧孔效应 增益耦合 CPM-DCC光栅结构 

分 类 号：TN256[电子电信—物理电子学]