Efficient compensation of chromatic dispersion and nonlinearities using logarithmic digital backward propagation in N-channel DWDM 1.12Tbit/s DP-QPSK transmission

Rameez Asif, Chien Yu Lin, Bernhard Schmauss

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We propose and numerically investigate the logarithmic step-size distribution for implementing an efficient digital backward propagation (DBP) algorithm using the split-step Fourier method (SSFM). DBP is implemented in N-channel dual-polarization quadrature-phase-shift-keying (DP-QPSK) transmission over 2000 km standard single-mode fiber (SMF) with no in-line optical dispersion compensation. This algorithm is compared with the constant step-size modified DBP (M-SSFM) algorithm in terms of efficiency, complexity and computational time. Furthermore, we investigate the same-capacity and same-bandwidth transmission systems with 14 Gbaud (GBd), 28GBd and 56GBd per-channel rates. The logarithmic step-size based DBP algorithm depicts efficient mitigation of chromatic dispersion (CD) and nonlinear (NL) impairment. The benefit of the logarithmic step-size is the reduced complexity and computational time for higher baud rates.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalJournal of Modern Optics
Issue number2
Publication statusPublished - 20 Jan 2012


  • coherent receiver
  • digital backward propagation
  • dispersion
  • nonlinearities
  • optical communication
  • phase modulation

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