Impact of the IR LED Temperature on the Throughput of Optical Wireless Communication Links

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Abstract

In an optical wireless communication system, the LEDs require high bandwidth to achieve data rates compare to RF communications. Therefore, it is preferred to use high current densities to drive the LED, even beyond its maximum efficiency point. Nevertheless, the LED is a self-heating device where part of the electrical power is converted to optical power and the rest into heat. This increment of temperature in the LED will reduce its optical power and efficiency, causing a degradation of the optical system SNR. Firstly, we start by deriving
the relationship between the LED voltage with its junction temperature using the Shockley equation. Then, we measure the forward voltage at different temperatures to prove a linear relation between them. The optical power, LED bandwidth, and efficiency can be calculated using the ABC parameters from the rate equation. Therefore, we propose a method to obtain these parameters by measuring the emitted optical power and its rise time when varying the driving current. Finally, the ABC parameters are calculated by solving an MMSE problem with the measurements previously done. The throughput of an optical wireless link depends on the efficiency and the LED bandwidth, thus it is temperature dependent. We calculate the degradation of the rate caused by the temperature increment.
Original languageEnglish
Title of host publicationPhysics and Simulation of Optoelectronic Devices XXXI
EditorsBernd Witzigmann, Marek Osinski, Yasuhiko Arakawa
PublisherSPIE
Number of pages10
ISBN (Electronic)9781510659353
DOIs
Publication statusPublished - 10 Mar 2023
EventSPIE OPTO 2023 - San Francisco, United States
Duration: 28 Jan 20233 Feb 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12415
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceSPIE OPTO 2023
Country/TerritoryUnited States
CitySan Francisco
Period28/01/233/02/23

Keywords

  • Optical wireless communication (OWC)
  • LED lighting
  • forward voltage method
  • IQE
  • dIQE
  • LED
  • OWC

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