Wu Yuqing, Luo Hanwen, Deng Lei, Yang Qi, Dai Xiaoxiao, Liu Deming, Cheng Mengfan
Opt Lett. 2022 Oct 15;47(20):5285-5288. doi: 10.1364/OL.470839.
We propose and experimentally study a coherent optical secure transmission system based on one dual-polarization in-phase and quadrature modulator (IQM). One beam of the polarized light is used to generate broadband chaos by configuring a nonlinear opto-electronic oscillator while the other beam carries the encrypted signal. The encrypted signal is obtained through sequential encryption of the analog and digital chaos. The mutual mask of the hybrid chaotic signals can effectively enhance the security performance. Moreover, by varying the encryption depth of analog and digital vectors, the transmission performance can be flexibly adjusted. A commercial dual-polarization IQM could simultaneously generate a chaotic signal and a load message, which provides a high-integration solution. A fast independent component analysis (ICA) algorithm is adopted to compensate for the rotation of state of polarization (RSOP). 60 Gb/s encrypted quadrature phase shift keying (QPSK) signal transmission over 100 km single-mode fiber is realized, and the decrypted bit error rate (BER) performance is below the 7% forward error correction (FEC) threshold (BER = 3.8 × 10).
我们提出并通过实验研究了一种基于一个双偏振同相正交调制器（IQM）的相干光安全传输系统。一束偏振光通过配置一个非线性光电振荡器来产生宽带混沌，而另一束光携带加密信号。加密信号是通过模拟和数字混沌的顺序加密获得的。混合混沌信号的相互掩码可以有效提高安全性能。此外，通过改变模拟和数字矢量的加密深度，可以灵活调整传输性能。商用双偏振IQM可以同时生成混沌信号和负载消息，这提供了一种高集成度的解决方案。采用快速独立分量分析（ICA）算法来补偿偏振态旋转（RSOP）。实现了在100 km单模光纤上60 Gb/s加密正交相移键控（QPSK）信号传输，解密后的误码率（BER）性能低于7%前向纠错（FEC）阈值（BER = 3.8×10）。
