Precisely measuring for optical pulse time delay using autocorrelation
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摘要: 为了满足在高精度波分复用/时分复用光采样系统中,采样光脉冲时间抖动低于100 fs的要求,开发了一套基于自相关法测量时间延迟的系统。通过光纤耦合器连接一路参考光路将光脉冲在时域上进行"复制",并使初始光脉冲和"复制"光脉冲相关,得到参考光路和被测光路的精确光程差,进而固定参考光路并接入不同被测光路从而得到多路被测光路之间相对延时。实验结果表明,利用自相关法测量脉冲时间间隔精度优于50 fs,满足波分复用/时分复用光采样系统研究需要。Abstract: In order to fulfill the requirement that optical sampling pulse time jitter is less than 100 femtosecond in the high precision WDM/OTDM optical sampling system, a system using the autocorrelator to measure the time delay is developed. By a fiber coupler connecting a reference optical path to copy the optical pulse, the initialized optical pulse is correlated with the copied pulse to get the time delay between measured optical path and the reference optical path, and then to get the relatively time delay between the measured optical paths. The experiment result indicates that the precision of the autocorrelation method is better than 50 femtosecond, which can satisfy the research requirements of the WDM/OTDM system.
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Key words:
- optical sampling /
- time jitter /
- time delay /
- autocorrelator
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图 4 自相关峰相对位置随着参考路与测量路光程差发生变化
Figure 4. Relative position changes of the autocorrelation peaks with the optical path difference between the reference optical path and the measuring optical path
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