Abstract
A highly secure and reliable optical orthogonal frequency division multiplexing passive optical network (OFDM-PON) based on the chaos encryption inside polar code scheme is proposed. The 3-dimensional Chua's circuit model is adopted to realize chaotic encryption during polar encoding with low complexity. The three chaotic sequences generated by Chua's circuit model are used to encrypt information index bit matrix, frozen bits (during polar encoding) and subcarrier sequence, respectively. The BER and security performance of the optical transmission system are enhanced by our method. A 70 Gb/s polar encoded encrypted 16 quadrature amplitude modulation OFDM signal transmission over a 2 km seven-core fiber is further experimentally demonstrated. The experimental results show that the polar encoded encrypted 16 QAM-OFDM obtains a 2.1 dB gain in receiver sensitivity at a BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−3</sup> under the same bit rate compared to the normal 16 QAM-OFDM without FEC. Moreover, the key space of the proposed scheme is 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">84</sup> , which is large enough to guard against any malicious attacks from illegal ONUs effectively. The combined superiority of BER and security performance enable such OFDM-PON based on chaos encryption inside polar code, to have a high prospect of application in low-cost and reliable optical access system.
Highlights
THE emergence of large-scale commercial communication networks has been in urgent need for high security and reliability of high-speed optical communication systems [1]
The orthogonal frequency division multiplexing (OFDM) PON is capable of meeting the requirement of rapid growth of the bandwidth, which is considered as a promising candidate for optical access system [2]
A highly secure and reliable OFDM-PON scheme based on chaos encryption inside polar code is proposed, realizing the enhancement of both BER and security performance in optical access system
Summary
THE emergence of large-scale commercial communication networks has been in urgent need for high security and reliability of high-speed optical communication systems [1]. The group has realized a high security optical transmission system with large key space by using Chua’s circuit model, the transmission reliability has not been improved [27]. The close combination of Polar code and chaos encryption makes signals more difficult to be cracked illegally, and improves the reliable performance of optical transmission system. There is still lack of encryption coding modulation methods to guarantee the reliability and security of multi-core OFDM-PON. A highly secure and reliable 16QAM-OFDMPON applied in optical access system based on chaos encryption inside polar code, is proposed and demonstrated in the 2 km seven-core fiber transmission experimentally. The 3D Chua’s circuit model is adopted to realize chaotic encryption during polar encoding, BER improvements and security performance enhancement simultaneously. The key space of the proposed scheme is 1084
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