A Modif ied Adaptive DBP for DP 16-QAM Coherent Optical System

• Published in: IEEE photonics technology letters Vol. 28; no. 22; pp. 2511 - 2514
• Main Authors: Yao, Haitao, Li, Wei, Han, Jilong, He, Zhixue, Yuan, Zhilin, Hu, Qianggao, Yang, Qi, Yu, Shaohua
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.11.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coherent optical communication; digital back-propagation; dual-polarization 16-ary quadrature amplitude modulation; interpolation; nonlinear effect; Optical fiber amplifiers; Optical fiber dispersion; Optical fiber networks; Optical fiber polarization; Optimized production technology
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2016.2601933

A modified adaptive digital backpropagation (A-DBP) algorithm based on intensity variance is proposed in this letter. In the simulation, a 25-GBd dual-polarization 16-quadrature amplitude modulation transmission system with a transmission distance of 2000 km is established to investigate the performance of the proposed A-DBP. The simulation results show that the proposed A-DBP can dynamically estimate the optimal fiber nonlinear coefficient γ opt and achieve comparable or even better performance than the DBP with full knowledge of fiber. Moreover, the proposed A-DBP can achieve better performance compared with the previous A-DBP based on intensity variance. Moreover, the proposed A-DBP requires fewer iterations to determine γ opt compared with the previous A-DBP based on intensity or phase variance.