Open AccessSingle-step digital backpropagation for subcarrier-multiplexing transmissions
Author(s) -
Huazhi Lun,
Qunbi Zhuge,
Zhou Xiao,
Songnian Fu,
Ming Tang,
Deming Liu,
Weisheng Hu,
David V. Plant
Publication year - 2019
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.27.036680
Subject(s) - subcarrier multiplexing , subcarrier , computer science , multiplexing , electronic engineering , linear filter , infinite impulse response , wavelength division multiplexing , transmission (telecommunications) , polarization mode dispersion , optics , filter (signal processing) , orthogonal frequency division multiplexing , telecommunications , digital filter , channel (broadcasting) , bandwidth (computing) , physics , optical fiber , wavelength , engineering , computer vision
We propose and demonstrate a single-step digital back propagation (DBP) algorithm for metro and regional transmissions with high order modulation formats. Based on subcarrier-multiplexing (SCM)-DBP, two modifications are made to improve performance and reduce complexity for the targeted link scenarios. First, an infinite impulse response (IIR) filter is adopted in self-subcarrier nonlinear compensation. Second, the second stage chromatic dispersion (CD) compensation is incorporated into an existing adaptive filter. Through experiment, we demonstrate the performance of the proposed scheme, denoted as M-SCM-DBP, for single channel 34.94-GBd SCM PDM-32QAM transmission. With 86.3% complexity reduction compared with the low-pass filter assisted DBP, the proposed M-SCM-DBP achieves 0.6-dB Q 2 improvement for SCM-PDM-32QAM transmission over 960-km standard single mode fiber (SSMF). The reach extension of 36% to 1220-km is achieved with only 30.5 complex multiplications per sample, in comparison with the linear compensation scheme. Since the adaptive filter is used to simultaneously compensate 50% CD and other linear impairments, we also investigate the required number of filter taps and its polarization tracking ability.