Low-complexity logarithmic step-size-based filtered digital backward propagation algorithm for compensating fiber transmission impairments

Asif, Rameez, Lin, Chien Yu, Holtmannspoetter, Michael and Schmauss, Bernhard (2012) Low-complexity logarithmic step-size-based filtered digital backward propagation algorithm for compensating fiber transmission impairments. In: Next-Generation Optical Communication. Proceedings of SPIE - The International Society for Optical Engineering . UNSPECIFIED, USA. ISBN 9780819489272

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Abstract

We have investigated a new method to reduce the complexity of the digital backward propagation algorithm (DBP). A logarithmic step-size based split-step Fourier method (SSFM) is investigated in this paper to compensate fiber transmission impairments i.e. chromatic dispersion (CD) and non-linearities (NL) in dual-polarization quadrature phase shift keying (DP-QPSK) system. The algorithm is numerically investigated for coherently-detected multiple channel DP-QPSK system over 2000km (25 spans) standard single mode fiber (SMF-28) with un-compensated transmission link. The algorithm is numerically evaluated for: (a) 20 channel 56Gbit/s (14GBaud) with 25GHz channel spacing; (b) 10 channel 112Gbit/s (28GBaud) with 50GHz channel spacing and (c) 5 channel 224Gbit/s (56GBaud) with 100GHz channel spacing. Each simulation configuration has the bandwidth occupancy of 500GHz and a total transmission capacity of 1.12Tbit/s. The logarithmic DBP algorithm (L-DBP) shows efficient results as compared to the conventional DBP method based on modified SSFM (M-DBP). The results depict efficient mitigation of CD and NL, therefore improving the non-linear threshold point (NLT) upto 4dB. Furthermore by implementing a low-pass-filter (LPF) in each SSFM step, the required number of DBP stages to compensate fiber transmission impairments can be significantly reduced (multi-span DBP) by 75% as compared to L-DBP and by 50% as compared to M-DBP. The results delineate improved system performance of logarithmic step size based filtered DBP (FL-DBP) both in terms of efficiency and complexity which will be helpful in future deployment of DBP algorithm with real-time signal processing modules for non-linear compensation.

Item Type: Book Section
Uncontrolled Keywords: coherent communications,fiber optics communications,modulation,multiplexing,networks,non-linear optics,electronic, optical and magnetic materials,condensed matter physics,computer science applications,applied mathematics,electrical and electronic engineering ,/dk/atira/pure/subjectarea/asjc/2500/2504
Faculty \ School: Faculty of Science > School of Computing Sciences
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Depositing User: LivePure Connector
Date Deposited: 08 Sep 2022 09:30
Last Modified: 29 Sep 2022 23:49
URI: https://ueaeprints.uea.ac.uk/id/eprint/87922
DOI: 10.1117/12.909396

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