基于双驱马赫-曾德尔调制器的加密调制一体化系统

Encryption-Modulation Integrated System Based on Dual-Drive MachZehnder Modulator

为提高光通信系统的物理层安全性能,设计并实现了一种基于双驱马赫-曾德尔调制器的加密调制一体化方案,该方案利用双驱马赫-曾德尔调制器中的矢量调制机制对明文和密钥在光域中进行异或加密操作,同时实现了加密和调制的功能复用。阐述了所提方案的基本工作原理和提升加密信号消光比的优化过程,并基于所提方案成功研制了加密调制一体化发射样机。实验结果表明,所提方案可以对传输速度为32 Gb/s的信号实现调制和加密,且信号消光比高达13.2 dB。仿真结果表明,在不同传输距离下,所提方案的接收信号消光比相比普通通断键控(OOK)系统有明显的提升。

To improve the physical layer security of the optical communication system,an encryption-modulation integrated scheme based on the dual-drive Mach-Zehnder modulator(DD-MZM)is proposed.In this scheme,the XOR encryption operation is realized between plaintext and key in the optical domain on the basis of the vector modulation mechanism in the DD-MZM,and the function reuse of encryption and modulation is achieved.The basic working principle of the proposed scheme and the optimization process of improving the extinction ratio of encrypted signals are described,and the prototype of an encryption-modulation integrated transmitter is successfully developed based on this scheme.The experimental results reveal that the modulation and encryption of signals with a transmission speed of 32 Gb/s can be successfully realized by this scheme,and the signal extinction ratio is as high as 13.2 dB.In addition,simulation analysis indicates that compared with the common on-off keying(OOK)system,the proposed system has a better extinction ratio for its received signals.