Physically secured orthogonal frequency division multiplexing–passive optical network employing noise-based encryption and signal recovery process

Wei Jin; Chongfu Zhang; Weicheng Yuan

doi:10.1117/1.OE.55.2.026103

1 February 2016 Physically secured orthogonal frequency division multiplexing–passive optical network employing noise-based encryption and signal recovery process

Wei Jin, Chongfu Zhang, Weicheng Yuan

Author Affiliations +

Optical Engineering, Vol. 55, Issue 2, 026103 (February 2016). https://doi.org/10.1117/1.OE.55.2.026103

Abstract

We propose a physically enhanced secure scheme for direct detection–orthogonal frequency division multiplexing–passive optical network (DD-OFDM-PON) and long reach coherent detection–orthogonal frequency division multiplexing–passive optical network (LRCO-OFDM-PON), by employing noise-based encryption and channel/phase estimation. The noise data generated by chaos mapping are used to substitute training sequences in preamble to realize channel estimation and frame synchronization, and also to be embedded on variable number of key-selected randomly spaced pilot subcarriers to implement phase estimation. Consequently, the information used for signal recovery is totally hidden as unpredictable noise information in OFDM frames to mask useful information and to prevent illegal users from correctly realizing OFDM demodulation, and thereby enhancing resistance to attackers. The levels of illegal-decryption complexity and implementation complexity are theoretically discussed. Through extensive simulations, the performances of the proposed channel/phase estimation and the security introduced by encrypted pilot carriers have been investigated in both DD-OFDM and LRCO-OFDM systems. In addition, in the proposed secure DD-OFDM/LRCO-OFDM PON models, both legal and illegal receiving scenarios have been considered. These results show that, by utilizing the proposed scheme, the resistance to attackers can be significantly enhanced in DD-OFDM-PON and LRCO-OFDM-PON systems without performance degradations.

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Wei Jin, Chongfu Zhang, and Weicheng Yuan "Physically secured orthogonal frequency division multiplexing–passive optical network employing noise-based encryption and signal recovery process," Optical Engineering 55(2), 026103 (1 February 2016). https://doi.org/10.1117/1.OE.55.2.026103

Published: 1 February 2016

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