Chaotic constant composition distribution matching for physical layer security in a PS-OFDM-PON

Area of Science:

• Optical Communications
• Network Security
• Signal Processing

Background:

• Passive optical networks (PONs) are crucial for broadband access.
• Enhancing security and performance in PONs remains a key challenge.
• Orthogonal frequency division multiplexing (OFDM) offers high spectral efficiency.

Purpose of the Study:

• To propose a novel probabilistic shaping OFDM-PON (PS-OFDM-PON) system.
• To integrate chaotic encryption for enhanced security and performance.
• To demonstrate the feasibility of the proposed scheme for future optical access networks.

Main Methods:

• Implementation of a four-dimensional hyperchaotic Lv system for probabilistic shaping and encryption.
• Utilizing chaotic constant composition distribution matching (CCDM).
• Experimental transmission of an 8.9 Gb/s encrypted PS-16 quadrature amplitude modulation (QAM)-OFDM signal over 25 km of standard single mode fiber (SSMF).

Main Results:

• Achieved a 1.2 dB gain in receiver sensitivity at a bit error rate (BER) of 10^-3 compared to conventional 16QAM-OFDM.
• Demonstrated a large key space of 1.98 × 10⁷³ for robust security.
• Confirmed low complexity in signal modulation process.

Conclusions:

• The proposed PS-OFDM-PON with chaotic encryption offers superior bit error rate and security performance.
• The scheme is a promising solution for low-cost, secure optical access networks.
• The integration of probabilistic shaping and chaotic encryption enhances overall system efficiency and security.