Phase entropy-based Frequency Offset Estimation for coherent optical QAM systems

王萍 Wang Ping, Jian Chen, 由骁迪 You Xiaodi +3 more

201802 bcrc

Murat Azizoá ̧¡lu

Alexandru Frunză, Vincent Choqueuse, Pascal Morel +2 more

This paper proposes a parametric network that benefits from the system knowledge and jointly compensates for the transmitter in-phase/quadrature imbalance, carrier frequency offset, and laser phase noise in coherent optical systems. The approach uses an original training technique that increases its experimentally validated effectiveness. For the considered setup, the performance of the network reaches the 3 rd Generation Partnership Project threshold of 17.5% Error Vector Magnitude for 4-QAM communications.

Yufeng Luo, Xinshuai Liang, Chongfu Zhang +2 more

This article proposes a redundancy-free multiple phase-offset based key distribution (MPO-KD) scheme for solving the physical-layer session key agreement in optical data center interconnections (DCIs). High-dimensional chaotic encryption is a promising technology expected to provide better security for massive-scale data transmission in DCIs. Considering the huge key space introduced by hyper-chaos, the proposed scheme converts digital keys into the phase of quadrature amplitude modulation (QAM) symbols by actively introducing controllable offsets. The solution of offset factor space is modeled as a multi-objective optimization problem for improving the key distribution performance. The Pareto optimal set is obtained using the non-dominated sorting moth-flame optimization (NS-MFO) algorithm. The two-channel 140 Gb/s 16-QAM, 176 Gb/s 32-QAM and 210 Gb/s 64-QAM orthogonal frequency division multiplexing (OFDM) signal transmissions are successfully demonstrated. The results indicate that this scheme achieves error-free key distribution without degrading system performance, which supports an expandable large key space and has good compatibility with various encryption algorithms.

Murat Azizoğlu

Xie XIE, Winzer, Raybon