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在基于四波混频(FWM)效应实现频率变换的全光纤光学参量振荡器(OPO)中,信号光通常只能在较短的距离内获得有效的参量增益。根据光时域反射(OTDR)技术的基本原理,通过测量信号光的后向散射光,获得了信号光在光子晶体光纤(PCF)中的增长曲线,进一步计算得到了PCF中的参量增益分布;将PCF的起始端到参量增益急剧下降处的距离定义为有效作用长度,并且通过水浴实验验证了测量结果。测量发现,在34.5m的PCF中,有效作用长度仅有10m,信号光仅在PCF的前10m获得了有效增益,近似以指数形式增长,在后24.5m的PCF中,信号光与抽运光已不再满足相位匹配条件,信号光不再增长。这种测量全光纤OPO参量增益分布的方法有助于优化全光纤OPO的结构,提高全光纤OPO的转化效率。
In the all-fiber optical parametric oscillator (OPO) that performs frequency conversion based on the four-wave mixing (FWM) effect, the signal light usually achieves effective parametric gain over shorter distances. According to the basic principle of optical time domain reflectometry (OTDR), the growth curve of signal light in photonic crystal fiber (PCF) was obtained by measuring the backscattered light of signal light. The gain distribution of PCF in PCF was calculated. The distance from the beginning of PCF to the sharp drop of parametric gain is defined as the effective length of action, and the measurement results are verified by a water bath experiment. The measurement found that the effective length of the PCF in 34.5m is only 10m, the effective gain of the signal light is only obtained in the first 10m of the PCF, and the exponential growth of the PCF appears. In the latter 24.5m of the PCF, the signal light and the pump light The phase matching condition is no longer satisfied and the signal light no longer grows. This method of measuring the gain distribution of all-fiber OPO parameters helps to optimize the structure of all-fiber OPO and improve the conversion efficiency of all-fiber OPO.