Visible-light communications using a CMOS-controlled micro-light-emitting-diode array

McKendry, J. J.D., Massoubre, D., Zhang, S., Rae, B. R., Green, R. P., Gu, E., Henderson, R. K., Kelly, A.E. and Dawson, M. D. (2012) Visible-light communications using a CMOS-controlled micro-light-emitting-diode array. Journal of Lightwave Technology, 30(1), pp. 61-67. (doi: 10.1109/JLT.2011.2175090)

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Abstract

We report the high-frequency modulation of individual pixels in 8 by 8 arrays of III-nitride-based micro-pixellated light-emitting diodes, where the pixels within the array range from 14 to 84 microns in diameter. The peak emission wavelengths of the devices are 370, 405, 450 and 520 nm, respectively. Smaller area micro-LED pixels generally exhibit higher modulation bandwidths than their larger area counterparts, which is attributed to their ability to be driven at higher current densities. The highest optical -3 dB modulation bandwidths from these devices are shown to be in excess of 400MHz, which, to our knowledge, are the highest bandwidths yet reported for GaN LEDs. These devices are also integrated with a complementary metal-oxide-semiconductor (CMOS) driver array chip, allowing for simple computer control of individual micro-LED pixels. The bandwidth of the integrated micro-LED/CMOS pixels is shown to be up to 185 MHz; data transmission at bit rates up to 512 Mbit/s is demonstrated using on-off keying non return-to-zero modulation, using a 450 nm-emitting 24 micron diameter CMOS-controlled micro-LED. As the CMOS chip allows for up to 16 independent data inputs, this device demonstrates the potential for multi-Gigabit/s parallel data transmission using CMOS-controlled micro-LEDs.

Item Type:Articles
Keywords:Complementary metal-oxide-semiconductor(CMOS), GaN, micro-light-emitting diodes (micro-LEDs), modulation, visible light communications (VLC).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Green, Dr Richard and Mckendry, Dr Jonathan and Kelly, Professor Anthony and Zhang, Dr Shuailong
Authors: McKendry, J. J.D., Massoubre, D., Zhang, S., Rae, B. R., Green, R. P., Gu, E., Henderson, R. K., Kelly, A.E., and Dawson, M. D.
Subjects:Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Journal of Lightwave Technology
Journal Abbr.:JLT
Publisher:IEEE
ISSN:0733-8724
ISSN (Online):1558-2213

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