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由于分布反馈式(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.传统的DFB激光器在大电流条件下容易产生空间烧孔效应,从而造成单模特性不稳定.为了抑制空间烧孔效应,本文基于重构等效啁啾技术设计了具有双辅助相移的周期调制光栅结构,并从理论和实验两个方面进行了研究,理论仿真和实验结果吻合.另外仿真计算了激光器谐振腔中光场分布的平坦因子,利用双辅助相移周期调制光栅结构的DFB激光器,其腔内光场分布平坦程度得到明显提高.实验结果表明:温度25℃,注入电流50~160 m A时,激光器边模抑制比均超过35 d B,单模特性保持稳定.因此,本文论述的DFB激光器对空间烧孔效应具有明显抑制作用.
Because distributed feedback (DFB) semiconductor laser has the advantages of simple structure, stable spectrum and so on, it has a very wide range of applications in the field of optical communication.Traditional DFB lasers are prone to space hole burning effect under high current conditions, resulting in single mode characteristics In order to suppress the hole burning effect in space, a periodic modulation grating with double auxiliary phase shift was designed based on reconstruction equivalent chirp technique, and the theoretical and experimental studies were carried out. The theoretical simulation and experimental results are in good agreement. In addition, the flatness factor of the light field distribution in the laser resonator was simulated and the flatness distribution of the light field in the cavity was improved obviously by using DFB laser with double-assisted phase shift grating. The experimental results show that the injection current 50 ~ 160 m A, the laser side mode suppression ratio is more than 35 d B, the single-mode characteristics remain stable.Therefore, the DFB laser discussed in this article has a significant inhibitory effect on the spatial hole burning.