Abstract

Nyquist wavelength-division-multiplexed coherent optical superchannel systems closely pack a set of rectangular-shaped channels to realize high-spectral-efficiency transmission. In long-haul fiber links, dividing each of these channels into multiple subbands, each a few-gigahertz wide, can increase tolerance to fiber nonlinearity. However, these low-bandwidth subbands will be sensitive to laser drift, which could cause them to overlap, creating interchannel interference (ICI). In this paper, we propose the application of pairwise precoding across the middle and edge subbands to improve their ICI tolerance. The proposed scheme is verified in superchannel experiments, and shows about 1.5-dB Q² improvement after 3840-km transmission for QPSK modulation and 1-dB Q² gain with 16-QAM modulation after 800-km transmission.

© 2015 IEEE

Phase noise tolerant inter-carrier-interference cancellation for WDM superchannels with sub-Nyquist channel spacing

Shuchang Yao, Songnian Fu, Jianqiang Li, Ming Tang, Perry Shum, and Deming Liu
Opt. Express 21(18) 21569-21578 (2013)

Nyquist WDM superchannel using offset-16QAM and receiver-side digital spectral shaping

Meng Xiang, Songnian Fu, Ming Tang, Haoyuan Tang, Perry Shum, and Deming Liu
Opt. Express 22(14) 17448-17457 (2014)

Improved polarization dependent loss tolerance for polarization multiplexed coherent optical systems by polarization pairwise coding

Chen Zhu, Binhuang Song, Bill Corcoran, Leimeng Zhuang, and Arthur James Lowery
Opt. Express 23(21) 27434-27447 (2015)

Cyclostationarity-based joint monitoring of symbol-rate, frequency offset, CD and OSNR for Nyquist WDM superchannels

Maria Ionescu, Masaki Sato, and Benn Thomsen
Opt. Express 23(20) 25762-25772 (2015)

Enhancing underwater VLC with spatial division transmission and pairwise coding

Jiwei Wang, Chen Chen, Bohua Deng, Zhaoming Wang, Min Liu, and H. Y. Fu
Opt. Express 31(10) 16812-16832 (2023)