Constellation Shaping Chaotic Encryption Scheme With Controllable Statistical Distribution for OFDM-PON
Zhi Zhang, Yufeng Luo, Chongfu Zhang, Xinshuai Liang, Mengwei Cui, Kun Qiu
Abstract
In order to improve the signal transmission performance and physical layer security in orthogonal frequency division multiplexing-based passive optical network (OFDM-PON), we propose a constellation shaping chaotic encryption (CSCEn) scheme with controllable statistical distribution. In this scheme, a q <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">uadrature amplitude modulation</b> (QAM) symbol sequence is divided into several sub-sequences, and a further probabilistic shaping (PS) is performed by constellation region replacement in terms of the corresponding statistical information ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SI</i> ). Then the sequence <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SI</i> is encoded and encrypted into chaotic signal phases <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">by employing our key distribution algorithm. At the receiver, the <i>SI</i> is extracted first to restore the original signal</b> . To verify the effectiveness of this scheme, we successfully demonstrate an encrypted PS-16-QAM signal transmission over a 25-km <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">standard</b> single mode fiber (SSMF). The results show that the proposed scheme can flexibly improve bit error rate (BER) performance with low deployment complexity and provide sufficient security to resist attacks from illegal <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">optical network units (</b> ONUs), thus it displays a promising application prospect for future secure PON.