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Comparison of Low Complexity Coherent Receivers for UDWDM-PONs (λ-to-the-user)

Erkilinc, MS; Lavery, D; Shi, K; Thomsen, BC; Killey, RI; Savory, SJ; Bayvel, P; (2018) Comparison of Low Complexity Coherent Receivers for UDWDM-PONs (λ-to-the-user). Journal of Lightwave Technology , 36 (16) pp. 3453-3464. 10.1109/JLT.2018.2835376. Green open access

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OAPA It is predicted that demand in future optical access networks will reach multi-gigabit/s per user. However, the limited performance of the direct detection receiver technology currently used in the optical network units at the customers' premises restricts data rates. Therefore, the concept of coherent-enabled access networks has attracted attention in recent years, as this technology offers high receiver sensitivity, inherent frequency selectivity, and linear field detection enabling the full compensation of linear channel impairments. However, the complexity of conventional (dual-polarisation digital) coherent receivers has so far prevented their introduction into access networks. Thus, to exploit the benefits of coherent technology in the ONUs, low complexity coherent receivers, suitable for implementation in ONUs, are needed. In this paper, the recently proposed low complexity (simplified) coherent receiver (polarization-independent Alamouti-coding heterodyne receiver) is compared in terms of its minimum receiver sensitivity with five previously reported receiver designs, including a detailed discussion on their advantages and limitations. Amongst these low complexity coherent receivers, it is shown that the Alamouti-coding based receiver approach requires the lowest number of photons per bit (PPB) transmitted (with a lower bound of 15.5 PPB in an ideal implementation of the system), achieved with a hardware complexity comparable to currently employed direct detection receivers, which typically require over 1000 PPB. Finally, the comparison of experimentally achieved receiver sensitivities and transmission distances using this receivers is presented, concluding that the Alamouti-coding receiver is also most resilient to chromatic dispersion and has the highest spectral efficiency amongst the proposed low complexity coherent receivers.

Type: Article
Title: Comparison of Low Complexity Coherent Receivers for UDWDM-PONs (λ-to-the-user)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JLT.2018.2835376
Publisher version: https://doi.org/10.1109/JLT.2018.2835376
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
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/10035239
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