A New Twist on Low-Complexity Digital Backpropagation

This work proposes a novel low-complexity digital backpropagation (DBP) method, with the goal of optimizing the trade-off between backpropagation accuracy and complexity. The method combines a split step Fourier method (SSFM)-like structure with a simplified logarithmic perturbation method to obtain...

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Vydáno v:Journal of lightwave technology Ročník 43; číslo 10; s. 4679 - 4692
Hlavní autoři: Civelli, Stella, Jana, Debi Pada, Forestieri, Enrico, Secondini, Marco
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 15.05.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Accuracy
Algorithms
Asymmetry
Back propagation
Complexity
Computational complexity
Computational modeling
Digital backpropagation
Digital signal processing
Dual polarization (waves)
Logarithms
nonlinear fiber channel
Numerical models
optical fiber communication
Optical fiber dispersion
Optical fibers
Optimization
Perturbation methods
Photonics
Signal processing
Signal processing algorithms
Splitting
Telecommunications
Two dimensional analysis
Wavelength division multiplexing
ISSN:0733-8724, 1558-2213
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Shrnutí:This work proposes a novel low-complexity digital backpropagation (DBP) method, with the goal of optimizing the trade-off between backpropagation accuracy and complexity. The method combines a split step Fourier method (SSFM)-like structure with a simplified logarithmic perturbation method to obtain a high accuracy with a small number of DBP steps. Subband processing and asymmetric steps with optimized splitting ratio are also employed to further reduce the number of steps required to achieve a prescribed performance. The first part of the manuscript is dedicated to the derivation of a simplified logarithmic-perturbation model for the propagation of a dual-polarization multiband signal in an optical fiber, which serves as a theoretical background for the development of the proposed coupled-band enhanced split step Fourier method (CB-ESSFM) and for the analytical calculation of the model coefficients. Next, the manuscript presents a digital signal processing algorithm for the implementation of DBP based on a discrete-time version of the model and an overlap-and-save processing strategy. Practical approaches for the optimization of the coefficients used in the algorithm and of the splitting ratio of the asymmetric steps are also discussed. A detailed analysis of the computational complexity of the algorithm is also presented. Finally, the performance and complexity of the proposed DBP method are investigated through numerical simulations and compared to those of other methods. In a five-channel 100 GHz-spaced wavelength division multiplexing system over a 15<inline-formula><tex-math notation="LaTeX">\mathbf {\times }</tex-math></inline-formula>80 km single-mode-fiber link, the proposed CB-ESSFM achieves a gain of about 1 dB over simple dispersion compensation with only 15 steps (corresponding to 681 real multiplications per 2D symbol), with an improvement of 0.9 dB over conventional SSFM and almost 0.4 dB over our previously proposed ESSFM. Significant gains and improvements are obtained also at lower complexity. For instance, the gain reduces to a still significant value of 0.34 dB when a single DBP step is employed, requiring just 75 real multiplications per 2D symbol. A similar analysis is performed also for longer links, confirming the good performance of the proposed method.
Bibliografie:ObjectType-Article-1
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ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2025.3542166