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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 effect of high-order sideband rejection ratio on the all-optical wavelength conversion system based on polarization-multiplexed signals with suppressed parallel pumping structure is theoretically studied and simulated. According to the Bezier function curve, the modulation depth of Mach-Zehnder modulator is adjusted by controlling the RF signal voltage, the optical sideband power of each frequency component is changed, and then the polarization directions with different high-order sideband rejection ratios are the same , Phase-locked parallel pump light, and analyze the performance of receiving BER under different sideband rejection ratios. The results show that by controlling the modulation depth of the modulator in the range of (1.7,2.0), the parallel pumping light with the sideband suppression ratio in the range of (7 dB, 18 dB) is obtained. After the all-optical wavelength conversion system, x y two polarization directions of the converted light bit error rate of 10 ~ (-10), the polarization insensitive signal can be received directly without crosstalk, so the filter can be used to filter out the residual sideband, thereby reducing the System complexity and cost.