Subnoise optical covert communication based on amplified spontaneous emission light

Area of Science:

• Optical communication systems
• Information security
• Signal processing

Background:

• Amplified spontaneous emission (ASE) is a prevalent noise source in optical amplification.
• ASE light can serve as a carrier for covert communication.
• Existing methods may lack sufficient security or efficiency.

Purpose of the Study:

• To propose and demonstrate an in-band subnoise optical covert communication scheme.
• To enhance the security of optical communication by hiding signals within noise.
• To investigate the feasibility of error-free covert signal transmission.

Main Methods:

• Developed an in-band subnoise optical covert communication scheme.
• Conducted a proof-of-concept experiment to validate the scheme.
• Ensured the covert signal's power spectral density was 10 dB below the public channel's noise.
• Implemented signal hiding in both optical and electrical domains.

Main Results:

• Successfully demonstrated the proposed in-band subnoise optical covert communication scheme.
• Achieved error-free transmission of the covert signal.
• The secure channel's power spectral density was significantly lower than the background noise.
• The covert signal was effectively hidden in both optical and electrical domains.

Conclusions:

• The in-band subnoise scheme provides a robust method for optical covert communication.
• Error-free transmission is achievable even when signals are hidden below the noise floor.
• The study highlights the trade-off between covertness and communication availability.
• This technique offers enhanced security for optical communication systems.