摘要
针对激光器作为光源在直接调制下会产生频移的问题,对小信号调制下分布反馈式(DFB)激光器的啁啾特性进行了理论分析和仿真研究,并给出了影响频率啁啾的因素和改善措施,仿真结果验证了分析结果的正确性.对激光器的频率啁啾和强度调制响应进行了仿真比较,验证了频率啁啾的峰值频率与张弛振荡频率相仿,得出能促使驰豫振荡衰减的措施也能使啁啾降低的结论.分析了一个能简便衡量频率啁啾的量对通信系统的影响,为进一步优化设计DFB激光器,改善其性能指标提供了依据.
The problem of frequency shift appears for laser as a light source under direct modulation,and the chirp characteristics of DFB laser diodes under small signal modulation are studied and analyzed.The factors and improvements on the frequency chirp are proposed,and the simulation results confirm the correctness of the analysis results.The simulation comparison between the frequency chirp of laser and IM response is made,and the similarity between the peak frequency of the frequency chirp and relaxation oscillation frequency is validated.Results show that the measures for impelling attenuation of relaxation oscillation can be used to reduce the chirp.The impacts of simple measurement of frequency chirp on the communication system are analyzed.This provides the basis for optimization design and improvement of the device performance.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2011年第10期1482-1486,共5页
Journal of Beijing University of Technology
基金
教育部新世纪人才计划项目(NCET-09-0002)
