| Summary: | We propose a multi-user optical steganography transmission system based on the filtered amplified spontaneous emission (ASE) noise for the first time. The stealth signal can be hidden in the public channel in the time and frequency domain. The proposed multi-user transmission system can improve the capacity of stealth channel through increasing the number of stealth users, in order to overcome the major limitation of the single stealth channel transmission based on the ASE noise. Meanwhile, system performance of optical steganography system is theoretically analyzed and simulation demonstrated. The signal-to-noise ratio (SNR) of the stealth channel and the public channel are derived and analyzed. The interaction between the public channel and the stealth channel is investigated based on bit rate, transmission distance, optical bandwidth of the stealth user, and power spectral density of the ASE noise, which can affect the capacity of the stealth channel. In addition, the additional layer security of the stealth channel is analyzed in the proposed multi-user optical steganography system, and simulation results show that this approach is efficient and the security of the stealth user can be guaranteed.
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