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Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems

Li, Z; Erkilinc, MS; Galdino, L; Shi, K; Thomsen, BC; Bayvel, P; Killey, RI; (2016) Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems. Optics Express , 24 (25) pp. 29177-29190. 10.1364/OE.24.029176. Green open access

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Abstract

Single-polarization direct-detection transceivers may offer advantages compared to digital coherent technology for some metro, back-haul, access and inter-data center applications since they offer low-cost and complexity solutions. However, a direct-detection receiver introduces nonlinearity upon photo detection, since it is a square-law device, which results in signal distortion due to signal-signal beat interference (SSBI). Consequently, it is desirable to develop effective and low-cost SSBI compensation techniques to improve the performance of such transceivers. In this paper, we compare the performance of a number of recently proposed digital signal processing-based SSBI compensation schemes, including the use of single- and two-stage linearization filters, an iterative linearization filter and a SSBI estimation and cancellation technique. Their performance is assessed experimentally using a 7 × 25 Gb/s wavelength division multiplexed (WDM) single-sideband 16-QAM Nyquistsubcarrier modulation system operating at a net information spectral density of 2.3 (b/s)/Hz.

Type: Article
Title: Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.24.029176
Publisher version: http://doi.org/10.1364/OE.24.029176
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: Science & Technology, Physical Sciences, Optics, Cancellation Receiver, Transmission, Band
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/1532888
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