基于光相位信号延时自相干的相位信息高速实时取样系统

提出了一种基于光相位信号自相干的高速光相位实时取样方案。利用时延为10ps的延时干涉仪(DI),将待测光信号的相位信息转换为强度信息;再在高非线性光纤(HNLF)中,利用四波混频(FWM)效应对强度信号进行取样。在接收端,利用不同中心波长的光滤波器(OBPF)即可滤出不同时间点的取样信号,从而在光域同时完成高速光相位信息的实时取样和取样信号的串-并转换。本文方案具有成本低、对测信号码率和波长不敏感的优点。实验中,对9GHz正弦调制以及10Gb/s非归零码调制的光相位信号实现了100G/s的高速实时取样系统,并转换为10路10G/s取样信号输出,最终恢复取样光信号的相位波形。

High-speed real-time optical phase sampling system based on delay self interference of optical phase signal

We propose a high-speed real-time optical phase sampling system based on delay self interference of optical signal.delay interferometer with a time delay of 10 ps is used to convert the phase information into amplitude information.Then,optical sampling of the amplitude signal is achieved by optical parametric amplification in high nonlinear fiber(HNLF).By employing optical band-pass filters(OBPFs) or wavelength division multiplexing(WDM) before the receivers,simultaneous high speed optical sampling and optical serial-to-parallel conversion are achieved.The system is low cost and insensitivie to the bit-rate as well as wavelength.We demonstrate the feasibility of the scheme by optical sampling of a 10 Gbit/s phase modulated signal at the sampling rate of 100 G/s and then ten 10 G/s sampling outputs are achieved.And the 10 Gbit/s phase signal is reconstructed successfully.