双光路信号段交替合成压缩加密系统研究

Research on the encryption system by segment alternately switching synthesis for the signal of double optical path

介绍了一种光信号时域压缩的双光路信号段切换处理方法，在全光系统中实现了光信号分段切换，避免电子系统中存在的抗电磁干扰能力差等固有缺陷。红激光差拍干涉形成的移动干涉条纹等间隔匀速擦除由紫外光差拍干涉形成的移动光腔。通过调整系统参数，使两光波导之间写入光栅和擦除光条纹的移动速度分别相同，实现在同一时刻，两光波导对应位置的擦除红光明暗条纹分布相反，使得双路输入光信号被压缩切换到一路光信号输出，从而实现光信号的分段切换，可用于置乱加密等信号处理装置。

This paper introduced a method to encrypt by segment alternately switching for two optical-signals based on signal compression in time domain, which realize the segment alternately switching for optical signals in the all optical system, avoid defect of weak ability to anti-jamming in electric system. In this system, the displacement optical cavity formed by ultraviolet beat interference is erased in uniform speed by the mobile fringes from red light beat interference. By adjust parameters, the writing of the grating and the erasing of the stripes between the two wave-guides would be the same speed. At the same time, the erased red stripes brightness distribution of the two wave-guides is reverse, makes dual input signals are compressed switch to single output to achieve segment switching for the optical signal, which can contribute to confusing encryption devices or other signal processing.