Design and optimization of high-speed receivers for 6G optical wireless networks

Elham Sarbazi, Hossein Kazemi, Michael Crisp, Taisir El-Gorashi, Jaafar Elmirghani, Richard V. Penty, Ian H. White, Majid Safari, Harald Haas

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
5 Downloads (Pure)

Abstract

To achieve multi-Gb/s data rates in 6G optical wireless access networks based on narrow infrared (IR) laser beams, a high-speed receiver with two key specifications is needed: a sufficiently large aperture to collect the required optical power and a wide field-of-view (FOV) to avoid strict alignment issues. This paper puts forward the systematic design and optimisation of multi-tier non-imaging angle diversity receivers (ADRs) composed of compound parabolic concentrators (CPCs) coupled with photodiode (PD) arrays for laser-based optical wireless communication (OWC) links. Design tradeoffs include the gain-FOV tradeoff for each receiver element and the area-bandwidth tradeoff for each PD array. The rate maximisation is formulated as a non-convex optimisation problem under the constraints on the minimum required FOV and the overall ADR dimensions to find the optimum configuration of the receiver bandwidth and FOV, and a low-complexity optimal solution is proposed. The ADR performance is studied using computer simulations and insightful design guidelines are provided through various numerical examples. An efficient technique is also proposed to reduce the ADR dimensions based on CPC length truncation. It is shown that a compact ADR with a height of ≤0.5 cm and an effective area of ≤0.5 cm2 reaches a data rate of 12 Gb/s with a half-angle FOV of 30° over a 3 m link distance.
Original languageEnglish
Pages (from-to)971-990
Number of pages20
JournalIEEE Transactions on Communications
Volume72
Issue number2
Early online date30 Oct 2023
DOIs
Publication statusPublished - 16 Feb 2024

Keywords

  • laser-based optical wireless communication (OWC)
  • angle diversity receiver (ADR)
  • non-imaging optics
  • rate maximisation
  • 6G
  • compact receiver design
  • vertical cavity surface emitting laser (VCSEL)

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