Open AccessLow complexity split digital backpropagation for digital subcarrier-multiplexing optical transmissions
Author(s) -
Zhou Xiao,
Qunbi Zhuge,
Songnian Fu,
Fangyuan Zhang,
Meng Qiu,
Ming Tang,
Deming Liu,
David V. Plant
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.027824
Subject(s) - transmitter , subcarrier multiplexing , subcarrier , multiplexing , electronic engineering , computer science , compensation (psychology) , wavelength division multiplexing , optics , quadrature amplitude modulation , reduction (mathematics) , orthogonal frequency division multiplexing , telecommunications , bit error rate , channel (broadcasting) , physics , engineering , mathematics , geometry , wavelength , psychology , psychoanalysis
A split digital backpropagation (DBP) scheme for digital subcarrier-multiplexing (SCM) transmissions, denoted as SSDBP, is proposed and studied in both experiments and simulations. The implementation of the SSDBP is split at the transmitter and the receiver, leveraging existing chromatic dispersion (CD) compensation blocks to reduce complexity. We experimentally demonstrate that the SSDBP, with a complexity reduction up to 50% compared to the original receiver based SCM-DBP, can achieve a nonlinear compensation Q 2 gain of 0.7-dB and 0.9-dB for 1920-km and 2880-km 34.94-GBd single channel PDM-16QAM transmissions, respectively. The maximum reach can be extended by 31.6% using 2-step SSDBP with only 27.5 complex multiplications per sample. Meanwhile, using 3-step SSDBP, the reach extension can be increased to 40.8%. The benefit of implementing part of SSDBP at the transmitter is experimentally validated with 0.1-dB Q 2 improvement at 4-dBm launch power. We also numerically investigate the impact of the digital-to-analog converter (DAC) resolution and fiber parameter uncertainties on the nonlinear compensation performance of the SSDBP.