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Two-Stage Linearization Filter for Direct-Detection Subcarrier Modulation

Li, Z; Erkilinc, MS; Maher, R; Galdino, L; Shi, K; Thomsen, BC; Bayvel, P; (2016) Two-Stage Linearization Filter for Direct-Detection Subcarrier Modulation. IEEE Photonics Technology Letters , 28 (24) pp. 2838-2841. 10.1109/LPT.2016.2623491. Green open access

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Abstract

A novel digital two-stage linearization filter is proposed for direct-detection (DD) systems and assessed experimentally for the first time. The performance improvement is quantified by experiments with a 7 × 25 Gb/s wavelength division multiplexing DD single sideband 16-QAM Nyquist-shaped subcarrier modulation system with a net optical information spectral density of 2.3 (b/s)/Hz. The results indicate that this technique can effectively compensate the nonlinearity caused by square-law detection, while, at the same time reducing the DSP complexity, avoiding the need to perform the multiple iterations which are required in previously proposed beating interference cancellation methods.

Type: Article
Title: Two-Stage Linearization Filter for Direct-Detection Subcarrier Modulation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/LPT.2016.2623491
Publisher version: http://dx.doi.org/10.1109/LPT.2016.2623491
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: Direct detection, Nyquist-pulse shaped subcarrier modulation, signal-signal beat interference cancellation, spectrally-efficient wavelength division multiplexing, Transmission, Cancellation, Direct detection, Nyquist-pulse shaped subcarrier modulation, signal-signal beat interference cancellation, spectrally-efficient wavelength division multiplexing
UCL classification: UCL
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 Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1531899
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