This letter 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 $10^{-3}$ . 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 $10^{98}$ , which is large enough to effectively protect against illegal attackers.

中文翻译：

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基于混沌集分区SLM的PAPR降级安全OFDM-WDM-PON

这封信提出并通过实验证明了一种基于新型混沌集分区选择性映射 (SP-SLM) 方案的正交频分复用波分复用无源光网络 (OFDM-WDM-PON) 系统。通过三维混沌系统的实现，在OFDM信号调制过程中同时实现峰均比(PAPR)降低和混沌加密，从而在存在PAPR的情况下提高系统性能，比特误码率 (BER)、光纤非线性容限和安全性。实验结果表明，与原始OFDM信号相比，采用SP-SLM的OFDM信号在互补累积分布函数值为 $10^{-4}$ ，以及在 BER 为 1.1 dB 的接收器灵敏度增益 $10^{-3}$ . 对于光纤非线性容限，采用SP-SLM的OFDM信号的最佳发射光纤功率为10 dBm，在-16 dBm的相同接收光功率下，优于原始OFDM信号的9 dBm。此外，所提出方案的密钥空间可以达到 $10^{98}$ ，它足够大，可以有效地防止非法攻击者。