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提出了光域隐藏通信的概念以及评价其性能的指标:隐藏性、可用性和稳健性,给出了基于现有光纤通信体制的三种光域隐藏通信方案及其对系统配置的要求。使用光纤通信系统仿真软件对所提出的方案进行了仿真研究,针对现有的光纤宿主信道的特点,提出了采用码移键控(CSK)平衡调制方式和基于等效相移超结构光纤光栅(EPS-SSFBG)双边带编/解码器的系统配置方案以提高系统的性能。结果表明,该方法各项性能指标良好。在信噪比为—13 dB,信号完全隐藏在信道噪声中的情况下,仍然能够以1.25 Gb/s的速率保持通信,能够抑制隐藏系统与宿主系统间的相互影响,是一种具有较高应用价值的光域隐藏通信方法。
This paper proposes the concept of optical domain hidden communication and the index of performance evaluation: hiddenness, availability and robustness. Three kinds of hidden optical communication schemes based on existing optical fiber communication system and their requirements for system configuration are given. The proposed scheme is simulated using the optical fiber communication system simulation software. According to the characteristics of the existing optical fiber host channel, a scheme of using balanced modulation of shift keying (CSK) and an equivalent phase shift superstructure fiber grating EPS-SSFBG) double-sideband encoder / decoder system configuration solutions to improve system performance. The results show that the method of various performance indicators are good. With a signal-to-noise ratio of -13 dB and the signal completely hidden in the channel noise, it is still able to maintain communication at a rate of 1.25 Gb / s, suppressing the interaction between the hidden system and the host system, Light Domain Hidden Communication Method with Application Value.