Selection of high power LEDs for Li-Fi applications

Mostafa H. Ahfayd, Zohaib A. Farhat, Martin J.N. Sibley, Peter J. Mather, P. I. Lazaridis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)


This work is concerned with a comparison between commercial available high-power LEDs, which have the same chip size but different power ratings (20 W, 30 W and 50 W), to find the most appropriate for Li-Fi applications, in terms of bandwidth before and after bandwidth extension. Two basic types of commercial LEDs were compared ('cool' and 'warm'), where the bandwidth of both types was in the range of 3 to 4 MHz, for all power values. After bandwidth extension, there was a marked disparity in the bandwidth between the several types, where the bandwidth increased to approximately 17 MHz for the 'warm', 33 MHz for the 50 W 'cool' and 36 MHz for 20 W and 30 W 'cool' LEDs. The bandwidth extended LEDs were implemented for a Li-Fi application based on offset PPM modulation transmission scheme at a rate of 13 Mbps. It was found that 'cool' LEDs have a more favourable performance than 'warm' LEDs in terms of data transmission and bit error rate (BER). Additionally, 20 W and 30 W LEDs have achieved a lower BER than the 50 W.

Original languageEnglish
Title of host publication2018 25th International Conference on Telecommunications, ICT 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Print)9781538623213
Publication statusPublished - 13 Sep 2018
Event25th International Conference on Telecommunications - Palais du Grand Large, Saint Malo, France
Duration: 26 Jun 201828 Jun 2018
Conference number: 25 (Link to Conference Website)


Conference25th International Conference on Telecommunications
Abbreviated titleICT 2018
CitySaint Malo
Internet address


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