PAPR-Degraded Secure OFDM-WDM-PON Based on Chaotic Set-Partitioned SLM

Abstract

This paper proposes and experimentally demonstrates an orthogonal frequency division multiplexing wavelength division multiplexing passive optical network (OFDM-WDM-PON) system based on novel chaotic set-partitioned selective mapping (SP-SLM) scheme. With the implementation of a three-dimensional chaotic system, peak-to-average power ratio (PAPR) reduction and chaotic encryption are simultaneously realized on the process of OFDM signal modulation, so as to enhance the system performance in the presence of PAPR, bit error rate (BER), fiber nonlinear tolerance and security. The experimental results show that, when compared with original OFDM signal, the OFDM signal with SP-SLM can achieve 4 dB PAPR reduction at the complementary cumulative distribution function value of 10-4, as well as a 1.1 dB gain in receiver sensitivity at a BER of 10-3 after transmission over 25 km standard single mode fiber (SSMF). For fiber nonlinear tolerance, the optimal launch fiber power of OFDM signal with SP-SLM is 10 dBm, which is better than 9 dBm of original OFDM signal under the same received optical power of -16 dBm. Furthermore, the key space of the proposed scheme can reach up to 1098, which is large enough to effectively protect against illegal attackers.