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中文摘要：
激光器调谐过程中的动态线宽是非常重要的参数，然而，当前各种测量方法得到的都是激光器稳定状态下的静态线宽．本文提出一种对干涉拍信号进行基于局部均值分解的时频分析进而获取激光动态线宽的方法，通过仿真信号验证了这种时频分析方法提取瞬时相位噪声的有效性；构建实验系统，利用10cm路径差产生约0．5ns的超短时延，提取相位噪声的时频分布，首次得到了分布反馈半导体激光器在脉冲工作模式下的动态线宽．
英文摘要：
The instantaneous linewidth in the process of tuning is a very important parameter of laser, however only static linewidth in steady state could be obtained by all kinds of measurement at present. So we proposed a method of measuring instantaneous linewidth by time-frequency analysis based on local mean decomposition, and after its validity of extracting the instantaneous phase noise of simulation signal was proved, we set the heterodyne measurement system with ultrashort delay （about 0.5 ns） which came from 10 cm optical path difference. Finally, we not only extracted the time-frequency spectrum of the beat signal＇s phase noise power, but also obtained the instantaneous linewidth of distributed-feedback diode laser under the pulse current for the first time so far as we Rnow.
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