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为了能够同时对多波长信号进行加密操作,两路相干光信号进行直接干涉前,通过对其中一路光信号进行Pi相移,Pi相移后两路信号的干涉结果即为两信号异或(XOR)逻辑结果。基于此原理,提出一种应用于波分复用(WDM)系统,能够同时对多波长复用信号进行XOR加密的方案。方案通过直接电光调制得到不同波长相干光信号与光密钥,且通过相移单元同时对多波长光密钥进行Pi相移,相移后相同波长的光密钥与光信号的耦合干涉输出便是对光信号的XOR加密结果,并输出多波长复用的加密信号。通过8×10Gbit/ps的WDM信号的加密仿真得到该方案加密输出误码率(EBR)为0,Q因子为164,证实了方案的可行性与有效性。分析了脉冲占空比对加密输出信号Q因子的影响。通过理论与仿真分析了输入归零码信号占空比对加密信号质量的影响得出,当信号占空比小于0.43时,加密输出信号Q因子能够稳定在164左右。
In order to be able to encrypt multi-wavelength signals at the same time, before the two coherent optical signals directly interfere with each other, the interference between the two signals after the Pi phase shift is obtained by performing Pi phase shift on one of the optical signals. The XOR ) Logical result. Based on this principle, a scheme applied to wavelength division multiplexing (WDM) system is proposed, which can simultaneously encrypt multiple wavelength multiplexed signals. By direct electro-optic modulation, the coherent optical signal and the optical key with different wavelength are obtained, and the phase shift unit performs the phase shift of the multi-wavelength optical key at the same time. After the phase shift, the coupling interference between the optical key and the optical signal of the same wavelength is output Is the result of XOR encryption of the optical signal and outputs the encrypted signal multiplexed with multiple wavelengths. Through the simulation of 8 × 10Gbit / s WDM signals, the EBR of the scheme is 0 and the Q factor is 164, which proves the feasibility and effectiveness of the scheme. The influence of pulse duty cycle on the Q factor of the encrypted output signal is analyzed. The influence of input duty cycle on the quality of the encrypted signal is analyzed by theory and simulation. When the signal duty cycle is less than 0.43, the Q factor of the encrypted output signal can be stabilized at about 164.