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为进一步提高光隐匿通信系统的安全性,提出了基于码移键控-光码分多址(CSK-OCDMA)技术的光隐匿通信方案,搭建了2.5Gb/s的实验系统。实验装置中采用低成本的分布反馈半导体激光器作为隐匿光源,宿主光源采用贴近波分复用(WDM)光网络实际的光波长转换板(OTU)。实验结果表明,隐匿信道可实现背靠背无误码传输,且隐匿信道的引入对宿主信道接收机灵敏度的影响仅为0.1dBm。在保证隐匿信道无误码传输的情况下,宿主与隐匿信号功率差最大可以达24.6dBm。加入前向纠错设备(FEC)后,实现了光隐匿通信系统100km无误码传输。
In order to further improve the security of the optical hidden communication system, a light concealment communication scheme based on the code shift keying-optical code division multiple access (CSK-OCDMA) technology is proposed, and a 2.5Gb / s experimental system is set up. Low-cost distributed feedback semiconductor lasers are used as the hidden light source in the experimental setup. The host light source uses the actual optical wavelength conversion board (OTU) close to the wavelength division multiplexing (WDM) optical network. Experimental results show that concealed channels can achieve back-to-back error-free transmission, and the introduction of concealed channels has only 0.1 dBm sensitivity to the host channel receiver. In the case of guaranteeing the transmission of the concealed channel without error, the maximum power difference between the host and the concealed signal can reach 24.6dBm. After adding Forward Error Correction Device (FEC), 100km error-free transmission of optical hidden communication system was realized.