Long Distance IM/DD Transmission with OFDM-QAM based Quantum Noise Stream Cipher
Wenyan Mao, Guanjun Gao, Cheng Xu, Haidan Liu, Yifan Shen, Jie Zhang, Yonggang Guo · 2019
We propose a QAM-based quantum noise stream cipher (QNSC) scheme for IM/DD transmission employing orthogonal frequency division multiplexing (OFDM) modulation. Secure transmission of 2.5 Gbit/s IMDD-OFDM signal is demonstrated over 1000 km distance. The experimental results show that Q penalty using IMDD-OFDM based QNSC is only 1.6 dB compared to QPSK without encryption in the cases of back-to-back condition and 1000 km transmission.