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Maher R, Xu T, Galdino L, Sato M, Alvarado A, Shi K, Savory SJ, Thomsen BC, Killey RI, Bayvel P. Spectrally shaped DP-16QAM super-channel transmission with multi-channel digital back-propagation. Sci Rep 2015; 5:8214. [PMID: 25645457 PMCID: PMC4314642 DOI: 10.1038/srep08214] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 12/22/2014] [Indexed: 11/16/2022] Open
Abstract
The achievable transmission capacity of conventional optical fibre communication systems is limited by nonlinear distortions due to the Kerr effect and the difficulty in modulating the optical field to effectively use the available fibre bandwidth. In order to achieve a high information spectral density (ISD), while simultaneously maintaining transmission reach, multi-channel fibre nonlinearity compensation and spectrally efficient data encoding must be utilised. In this work, we use a single coherent super-receiver to simultaneously receive a DP-16QAM super-channel, consisting of seven spectrally shaped 10GBd sub-carriers spaced at the Nyquist frequency. Effective nonlinearity mitigation is achieved using multi-channel digital back-propagation (MC-DBP) and this technique is combined with an optimised forward error correction implementation to demonstrate a record gain in transmission reach of 85%; increasing the maximum transmission distance from 3190 km to 5890 km, with an ISD of 6.60 b/s/Hz. In addition, this report outlines for the first time, the sensitivity of MC-DBP gain to linear transmission line impairments and defines a trade-off between performance and complexity.
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Affiliation(s)
- Robert Maher
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Tianhua Xu
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Lidia Galdino
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Masaki Sato
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
- NEC Corporation, Abiko, Japan
| | - Alex Alvarado
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Kai Shi
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Seb J. Savory
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Benn C. Thomsen
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Robert I. Killey
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
| | - Polina Bayvel
- Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom
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