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解释了利用法布里-珀罗(F-P)腔实现全光时钟恢复的原理。根据啁啾光栅(CFBG)的反射特性,从理论上分析了先利用CFBG对信号进行滤波再利用F-P腔进行时钟恢复在波长选择方面的优点,即将不需要恢复时钟的波长处的信号事先通过CFBG过滤掉。由于CFBG反射谱的顶端不平坦使得进入F-P腔的信号也不平坦,近而导致时钟恢复的效果不理想,故需利用切趾技术消除CFBG的反射谱顶端的不平坦,以获得更好的恢复效果。
Explains the principle of using the Fabry-Perot (F-P) cavity to achieve full optical clock recovery. According to the reflection characteristic of chirped grating (CFBG), we analyze the advantage of using CFBG to filter the signal and then use the FP cavity to recover the wavelength in theory. That is to say, the signal at the wavelength that does not need to recover the clock passes CFBG Filtered. Since the top of the CFBG reflection spectrum is uneven, the signal entering the FP cavity is also not flat, resulting in an unsatisfactory clock recovery effect. Therefore, the apodization technique needs to be used to eliminate the unevenness of the top of the CFBG reflection spectrum for better recovery effect.