高阶边带抑制比对全光波长变换系统性能的影响

Influence of High Order Sideband Suppression Ratio on Performance of All-Optical Wavelength Conversion System

理论研究并模拟仿真了高阶边带抑制比对基于载波抑制平行抽运结构的偏振复用信号的全光波长变换系统的影响。根据贝塞尔函数曲线性质,通过控制射频信号电压,调节马赫一曾德尔调制器的调制深度,改变了各频率成分的光边带功率,进而得到具有不同高阶边带抑制比的偏振方向相同、相位锁定的平行抽运光,分析了不同边带抑制比下转换光的接收误码率性能。结果证明:通过控制调制器的调制深度在(1.7,2.0)范围内,对应得到边带抑制比在(7 dB,18 dB)范围内的平行抽运光,经过全光波长变换系统后x和y两个偏振方向上的转换光的误码率均达到10^(-10),可实现偏振不敏感信号无串扰地直接接收,因此可以不使用滤波器将残留边带过滤掉,从而降低了系统的复杂度及成本。

The influence of the high order sideband suppression ratio on the all-optical wavelength conversion system of the polarization multiplexing signal of parallel pumps based on carrier suppression is theoretically analyzed and simulated. According to the character of Bessel function curve, the optical sideband power with different frequencies is changed by controlling the radio frequency signal voltage and adjusting the modulation depth of the Mach-Zehnder modulator, then the parallel pump light with the same polarization direction, locked phase and different high order sidebands suppression ratios are obtained. The receiving hit error rate performance of the converting light under different sidebands suppression ratios is analyzed, The theoretical analysis and simulation results show that the bit error rate of the converted light on the x and y polarization directions can achieve 10 10 by controlling the modulation depth of the modulator in the range of （1,7,2.0）, and the parallel pump light with the sidebands suppression ratio in the range of （7 dB, 18 dB） is got correspondingly. The signal can be received by direct-detection without crosstalk. So there is no need to filter out the vestigial sidebands by using filter. It not only reduces the complexity of the system but also saves the system cost.