Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 14, Pages 4622-4628Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3075728
Keywords
Optical fiber dispersion; Optical fiber amplifiers; Signal to noise ratio; Optical fiber polarization; Optical amplifiers; Optimized production technology; Optical fiber networks; Nonlinear distortion; nonlinear signal-noise interaction; optical fiber communication; optical Kerr effect
Funding
- National Key R&D Program of China [2018YFB1801204]
- National Science Foundation of China [61871408, U2001601, 61871082]
- Open Fund of IPOC (BUPT) [IPOC2020A011]
- Science and Technology Planning Project of Guangdong Province [2017B010123005, 2018B010114002]
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This study explores the shortcomings of the conventional method in compensating for optical fiber nonlinearity, and improves the performance by adjusting the power map in the virtual link with imbalanced DBP (iDBP). Simulation experiments demonstrate the enhanced performance of iDBP compared to CDBP.
In the canonical digital back-propagation (CDBP) of compensating for optical fiber nonlinearity, the aim is to invert the nonlinear Schrodinger equation (NSE). Therefore, the virtual link mirrors the fiber link for all the deterministic parameters. In theory, it can eliminate the deterministic linear and nonlinear impairments. However, the CDBP inherently does not consider the random noise along the fiber link. Meanwhile, the ultimate aim of optical receivers is to lower the BER or increase the SNR. To this aim, the CDBP may become sub-optimum in the presence of random noise. In this paper, we explicitly prove that the performance of CDBP can be improved by simply adjusting the power map in the virtual link. We call it imbalanced DBP (iDBP), since the parameters in the virtual link do not mirror those in the fiber link. Then by tuning the signal power in the virtual link, we derive the closed-form expressions of iDBP for single-span transmissions, and show that the SNR and information capacity can be increased, compared with CDBP. For multi-span transmissions, we demonstrate the improved performance of iDBP by simulation.
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