激光混沌外部调制包络隐藏及相位隐藏编码方法及其在光纤保密通信中的应用研究
doi: 10.3724/SP.J.1146.2007.00170
Envelope Making and Phase Encoding via External Modulation and Their Applications to Optical Fiber Secure Communications
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摘要: 该文研究光纤混沌包络隐藏与光纤相位隐藏保密通信理论模型，分析包络隐藏调制解调特性，导出解码公式；分析光纤自相位调制和光功率以及光放大器个数对系统的影响，提出接入相位控制器以减小非线性相移对同步解调负面影响的设想。数值模拟了调制速率0.2Gbit/s的混沌包络隐藏编码以及调制速率0.05Gbit/s的混沌相位隐藏编码及其在波长1.55m远程光纤数字保密通信中的应用，表明系统确具有较高的保密性能。Abstract: Theoretical models of envelope making and phase making of optical fiber chaotic secure communication are studied by coupling the chaotic encoding multiple-quantum-well laser systems and an optical fiber channel. Effects of the self-phase modulation of optical fiber and optical amplifier number are analyzed. The modulation and demodulation quality is analyzed and an encoding formula is demonstrated. A phase controller can be used to reduce the effect of nonlinear phase shift of fiber on the synchronization and demodulation. Finally, envelope making with a bit rate of 0.2Gbit/s and phase masking with a bit rate of 0.05Gbit/s are simulated in long-haul optical fiber secure communications at wavelength 1.55m. The systems have good secure performances.
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