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色散监测是实现高速光通信的一项关键技术,利用光波导器件的非线性效应进行色散监测可以实现集成化。硅光波导具有强烈的非线性特性,其非线性折射率系数约为5×10~(-18)m~2/W。当信号光和抽运光耦合后通过硅光波导,会产生自相位调制(SPM),交叉相位调制(XPM)等非线性效应,这些效应都能引起光谱的变化。光通信链路中存在的不同色散值会使得信号波形发生变化,波形变化的信号会在硅光波导中产生不同程度的SPM,XPM效应。通过合理设置滤波器的中心频率和带宽,同时测量由SPM,XPM效应产生的光谱变化结果,可实现对链路中残余色散的监测。研究表明色散监测范围可达±40 ps/nm。
Dispersion monitoring is a key technology to achieve high-speed optical communications. The use of nonlinear effects of optical waveguide devices for dispersion monitoring can be integrated. Silicon optical waveguide has a strong non-linearity, the nonlinear refractive index of about 5 × 10 ~ (-18) m ~ 2 / W. When the signal light and the pump light are coupled through the silicon optical waveguide, nonlinear effects such as self-phase modulation (SPM) and cross-phase modulation (XPM) are generated, and these effects can cause changes in the spectrum. Different dispersion values in the optical communication link can cause the signal waveform to change. The signal with the changed waveform produces different degrees of SPM and XPM effects in the silicon optical waveguide. By setting the center frequency and bandwidth of the filter reasonably and measuring the spectral changes caused by the SPM and XPM effects simultaneously, the residual dispersion in the link can be monitored. Research shows that dispersion monitoring can be as close as ± 40 ps / nm.