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2.5 Gb/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0.1 dBm。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24.6 dBm。加入前向纠错设备(FEC)后，实现了光隐匿通信系统100 km无误码传输。

To enhance the security of optical stealth transmission system, an optical stealth scheme based on code shift keying-optical code division multiple access (CSK-OCDMA) technology is proposed, and a 2.5 Gb/s experiment system is setup. The optical source of stealth channel is a low cost distributed feed back (DFB) semiconductor laser, and the public channel is optical transform unit (OTU) near wavelength division multiplexing (WDM) optical networks. The experiment demonstrates that the stealth channel can transmit back to back without bit error, and the penalty for public is only 0.1 dBm. When the stealth channel work without bit error is promised, the difference between public and stealth channels can be 24.6 dBm for the largest. After introducing the forward error correction (FEC), the system can transmit 100 km without bit error.