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• Chaotic Arnold transform and chirp matrix scheme to improve performance of OFDM-PON. • This scheme can improve sensitivity, and higher scrambling degree, lower correlation. • As such, we believe that this manuscript can meet the outstanding standards of Optical Fiber Technology, and it could be of interest to a broad readership. In this paper, we first propose and experimentally demonstrate an encryption scheme by combining the chaotic Arnold transform (CAT) and chaotic chirp matrix (CCM) techniques in orthogonal frequency division multiplexing passive optical network (OFDM-PON) system to simultaneously enhance physical-layer security and system transmission performance. In this system, the CAT is employed to scramble quadrature amplitude modulation (QAM) symbols in the time-frequency domain, thereby obtaining data encryption. Moreover, the CCM is designed to reduce the peak-to-average power ratio (PAPR) of OFDM signals and further enhance the system security. With these processing techniques, ∼10712 key space can be created to protect against exhaustive trials. A 10-Gb/s encrypted 16-QAM-based OFDM signal transmission is successfully demonstrated over a 20-km single mode fiber (SMF) by experiment. The results show that, our proposed method can achieve ∼2-dB PAPR reduction and ∼1.2-dB sensitivity improvement compared with the common OFDM-based PON system. Therefore, it can be considered a promising candidate for physical security enhancement in future OFDM-PON. [ABSTRACT FROM AUTHOR]

A modified Henon chaos mapping - based Tone Reservation (TR) method is presented to simultaneously improve the performance and security of orthogonal frequency division multiplexing passive optical network (OFDM-PON) system, which did not need any redundant sideband information. With the aid of high sensitivity of the low bits in the decimal part of chaos, the modified Henon chaos is constructed iteratively by extracting low bits of the previous chaotic value, which enhances the complexity and randomness of chaotic sequence values. And, by utilizing this chaos, the permutation vector can be conducted and is employed to scramble the distribution of reserved tones on the frequency domain and OFDM frames respectively, which can simultaneously achieve the peak-to-average power ratio (PAPR) reduction and data encryption. The feasibility of this scheme has been experimentally proven in 10-Gb/s OFDM-PON system through 20km fiber (SMF) transmission. Experimental results manifest that, compared to the common OFDM-PON system, the proposed scheme can achieve the ∼ 3dB PAPR reduction and ∼ 1dB BER improvement. [ABSTRACT FROM AUTHOR]