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Single-Step Digital Backpropagation for O-band Coherent Transmission Systems

Romulo Aparecido, Jiaqian Yang, Ronit Sohanpal, Zelin Gan, Eric Sillekens, John D. Downie, Lidia Galdino, Vitaly Mikhailov, Daniel Elson, Yuta Wakayama, David DiGiovanni, Jiawei Luo, Robert I. Killey, Polina Bayvel

TL;DR

This paper demonstrates a low-complexity, single-step digital backpropagation (DBP) approach to mitigate fibre nonlinearities in the O-band under near-zero dispersion conditions. By leveraging the low chromatic dispersion in this regime, the method achieves effective nonlinearity compensation for a $50\mathrm{Gbaud}$ PDM-256QAM link over a $151\mathrm{km}$ two-span SMF-28 ULL fibre, delivering up to $1.6\mathrm{dB}$ SNR gain and a $11.3\%$ increase in achievable information rate. The study also shows that varying the Wiener–Hammerstein (WH) split between pre- and post-DBP dispersion compensation has minimal impact, potentially halving FFT requirements and simplifying implementation. While interchannel nonlinearities in WDM are expected to reduce the gains, the work establishes the practicality of DBP in the O-band and motivates future experiments to quantify these effects.

Abstract

We demonstrate digital backpropagation-based compensation of fibre nonlinearities in the near-zero dispersion regime of the O-band. Single-step DBP effectively mitigates self-phase modulation, achieving SNR gains of up to 1.6 dB for 50 Gbaud PDM-256QAM transmission over a 2-span 151 km SMF-28 ULL fibre link.

Single-Step Digital Backpropagation for O-band Coherent Transmission Systems

TL;DR

This paper demonstrates a low-complexity, single-step digital backpropagation (DBP) approach to mitigate fibre nonlinearities in the O-band under near-zero dispersion conditions. By leveraging the low chromatic dispersion in this regime, the method achieves effective nonlinearity compensation for a PDM-256QAM link over a two-span SMF-28 ULL fibre, delivering up to SNR gain and a increase in achievable information rate. The study also shows that varying the Wiener–Hammerstein (WH) split between pre- and post-DBP dispersion compensation has minimal impact, potentially halving FFT requirements and simplifying implementation. While interchannel nonlinearities in WDM are expected to reduce the gains, the work establishes the practicality of DBP in the O-band and motivates future experiments to quantify these effects.

Abstract

We demonstrate digital backpropagation-based compensation of fibre nonlinearities in the near-zero dispersion regime of the O-band. Single-step DBP effectively mitigates self-phase modulation, achieving SNR gains of up to 1.6 dB for 50 Gbaud PDM-256QAM transmission over a 2-span 151 km SMF-28 ULL fibre link.
Paper Structure (2 sections, 2 figures)

This paper contains 2 sections, 2 figures.

Table of Contents

  1. Conclusions
  2. Acknowledgements

Figures (2)

  • Figure 2: SNR versus first span launch optical power (LOP1) after 256QAM signals transmission over two spans, comparing EDC and DBP with single step at 25 GBd and 50 GBd for (a) 1290 nm, (b) 1310 nm, and (c) 1330 nm.
  • Figure 3: Top figure: Wiener–Hammerstein model diagram. Bottom figure: SNR gain from DBP over EDC as a function of the WH split at the optimal DBP LOP.