16QAM OFDM-PON based on polar code and CCDM joint chaotic encryption

Area of Science:

• Optical Communications
• Information Security
• Coding Theory

Background:

• Optical communication systems face increasing demands for higher data rates and enhanced security.
• Existing encryption methods may not adequately address the evolving security threats in passive optical networks (PONs).

Purpose of the Study:

• To propose and experimentally validate a new optical transmitting scheme integrating chaotic encryption with Polar coding for improved security and performance.
• To assess the feasibility of a two-path chaotic encrypted Optical Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON).

Main Methods:

• Data encryption using Polar coding with a five-dimensional chaotic sequence.
• Dual-path chaotic Constant Component Distribution Matching (CCDM) encryption.
• Merging of encrypted channels and subcarrier scrambling.
• Experimental verification using a 16QAM-OFDM signal over a 2 km seven-core fiber.

Main Results:

• Achieved a bit error rate (BER) below 10^-3 for all optical network units (ONUs) with received optical power less than -15 dBm.
• The proposed system demonstrated a key space of 10⁸⁵, significantly enhancing security.
• Successful transmission experiment validating the scheme's feasibility.

Conclusions:

• The developed two-path chaotic encrypted OFDM-PON offers a promising solution for secure and efficient optical data transmission.
• The combination of CCDM and Polar coding provides robust security and excellent error correction capabilities.
• The scheme exhibits optimistic application prospects in modern optical transmission systems due to its superior BER and security performance.