改进型SOA-MZI全光异或门的加解密仿真研究

全光加密技术是解决目前光纤通信网的加解密速率瓶颈及物理层潜在的安全威胁的有力保证。针对现有全光异或加解密方案工作速率普遍较低的问题,在传统的SOA-MZI型全光异或门的基础上,利用两段色散互补的G.655单模光纤,并结合一个相位偏移器设计了一种改进型SOA-MZI全光异或方案,以该改进方案作为全光安全处理器在OptiSystem7.0仿真平台上搭建新的全光异或加解密方案,对输入信号比特速率分别为10Gb/s和40Gb/s的加解密方案进行了仿真实验验证。结果表明:基于改进型SOA-MIZ全光异或门的加解密方案可将全光异或加解密速率提高到40Gb/s,并且解密恢复出的明文数据的消光比约可以达到20dB,最大Q值约为25.7,加解密过程不会对通信系统引入额外误码。

A Simulation Research of Encryption and Decryption Technology Based on the Modified SOA-MZI All-Optical XOR Gate

All-optical encryption technology is the key to solve the speed bottleneck of encryption/decryption and the potential security threats on the physical layer of optical fiber communication network. Aiming at the problem that the processing rates of all existing all-optical XOR encryption/decryption schemes are generally low, an improved SOA-MZI all-optical XOR scheme is designed on the basis of the traditional SOA~MZI all-optical XOR gate, using two lengths of G. 655 single mode fiber, and combined with a phase shifter. The all-optical XOR encryption/decryption scheme is used as all-optical security processor to set up a new all-optical XOR encryption/decryption schemes on OptiSystem7.0 simulation platform, and simulation experiment verification is carried out on the encryption/decryption scheme of the input signals with 10 Gb/s and 40 Gb/s. The results show that the rate of the all-optical XOR encryption/decryption scheme based on improved SOA-MZI all-optical XOR gate could be increased to 40 Gb/s, and the extinction ratio of the decrypted date can reach about 20 dB, the maximum Q value is about 25.7. So the encryption/decryption process will not introduce additional error to the communication system.