Optical non-orthogonal multiple access based on amino acids and extended zigzag.

Area of Science:

• Optical communication networks
• Physical layer security
• Fiber optics

Background:

• Existing optical access networks face limitations in user capacity and physical layer security.
• Non-orthogonal multiple access (NOMA) schemes offer potential for increased spectral efficiency.
• Seven-core fiber technology enables spatial division multiplexing (SDM) for higher bandwidth.

Purpose of the Study:

• To propose and demonstrate a novel security-enhanced power division multiplexing (SPDM) scheme combined with seven-core fiber.
• To enhance data security at the physical layer and improve the split ratio of optical access networks.
• To increase spectral efficiency and the number of simultaneously served users.

Main Methods:

• Implementation of a security-enhanced power division multiplexing (SPDM) scheme.
• Integration with seven-core fiber for spatial division multiplexing (SDM).
• Experimental demonstration of 47.25 Gb/s SPDM orthogonal frequency division multiplexing (OFDM) signal transmission over 2 km.
• Novel signal encryption using amino acids combined with an extended zigzag pattern.

Main Results:

• Successfully transmitted 47.25 Gb/s SPDM-OFDM signals in a 2 km seven-core fiber system.
• Increased the number of access users by 14 times compared to conventional methods.
• Achieved a significantly large key space of 10^182 for robust data protection.
• Demonstrated enhanced spectral efficiency through digital signal superposition.

Conclusions:

• The proposed SPDM-SDM-PON scheme effectively enhances physical layer security and user capacity.
• The novel encryption method provides strong protection against data interception.
• The scheme shows significant potential for future telecommunication systems requiring high security and capacity.