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Optical Fibre Capacity Optimisation via Continuous Bandwidth Amplification and Geometric Shaping

Galdino, L; Edwards, A; Yi, W; Sillekens, E; Wakayama, Y; Gerard, T; Pelouch, W; ... Bayvel, P; + view all (2020) Optical Fibre Capacity Optimisation via Continuous Bandwidth Amplification and Geometric Shaping. IEEE Photonics Technology Letters , 32 (17) pp. 1021-1024. 10.1109/lpt.2020.3007591. Green open access

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Abstract

The maximum data throughput in a single mode optical fibre is a function of both the signal bandwidth and the wavelength-dependent signal-to-noise ratio (SNR). In this paper, we investigate the use of hybrid discrete Raman & rare-earth doped fibre amplifiers to enable wide-band signal gain, without spectral gaps between amplification bands. We describe the widest continuous coherent transmission bandwidth experimentally demonstrated to date of 16.83 THz, achieved by simultaneously using the S-, C- and L-bands. The variation of fibre parameters over this bandwidth, together with the hybrid amplification method result in a significant SNR wavelength-dependence. To cope with this, the signal was optimised for each SNR, wavelength and transmission band. By using a system-tailored set of geometrically shaped constellations, we demonstrate the transmission of 660 ×25 GBd channels over 40 km, resulting in a record single mode fibre net throughput of 178.08 Tbit/s.

Type: Article
Title: Optical Fibre Capacity Optimisation via Continuous Bandwidth Amplification and Geometric Shaping
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/lpt.2020.3007591
Publisher version: https://doi.org/10.1109/LPT.2020.3007591
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Broadband transmission system, high order modulation format, geometric shaping
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10106444
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