基于高非线性光纤中四波混频效应的全光取样系统

为了克服高比特率光信号实时取样时所面临的高速模数转换(ADC)限制,构建了一套基于高非线性光纤(HNLF)中四波混频效应的全光等效取样系统。全光取样系统主要包括取样脉冲信号产生、全光取样门和信号处理3部分,其中全光取样门为本系统的核心部分。取样脉冲和信号共同注入到HNLF中,基于四波混频效应实现全光取样。实验中,分别以10Gb/s、40Gb/s非归零OOK信号进行了取样实验验证。实验结果表明该取样系统可以实现高速光信号的取样过程。本文取样系统结构简单,且不受光信号速率的限制,可应用于更高速率的信号测量。

All-optical sampling system using four-wave mixing in highly nonlinear fiber

To overcome the limit with high-speed analog to digital convertion (ADC) required for real time sampling of the high-bit-rate optical signal,in t his paper,an all-optical equivalent-time sam pling system based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF) is set up.The all-optical sampling system mainly consists of the sampling optical pulse signal unit, all-optical sampling gate unit and signal processing unit,where the all-optica l sampling gate is the core of the sampling system which can complete the all-o ptical sampling of high-speed optical signal.The all-optical sampling is imple mented based on four-wave mixing effect when the sampling pulse a nd the signal are injected into the highly nonlinear optical fiber.In order to v erify the feasibility of the sampling system,10Gbit/s and 40Gbit/s not-retu rn-to-zero (NRZ) on-off keying (OOK) signals are used for the sampling experi ments.Experimental results show that the sampling system can achieve high-speed optical signal sampling procedure.At the same time,the sampling system is simpl e,not subject to the limitations of the optical signal rate,and can be applied t o higher-rate signal measurement.