Materials, Photonic Devices, and Sensors

Efficiency droop effects of GaN-based light-emitting diodes on the performance of code division multiple access visible-light communication system

[+] Author Affiliations
Huimin Lu, Chaowen Yan, Wei Gao, Jianping Wang

University of Science and Technology Beijing, School of Computer and Communication Engineering, No. 30 Xueyuan Road, Haidian District, Beijing 100083, China

Tongjun Yu

Peking University, The State Key Laboratory for Mesoscopic Physics, School of Physics, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China

Opt. Eng. 55(2), 027109 (Feb 25, 2016). doi:10.1117/1.OE.55.2.027109
History: Received November 12, 2015; Accepted February 9, 2016
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Abstract.  The physical mechanism in efficiency droop of GaN-based light-emitting diodes (LEDs) was investigated using a modified rate equation model considering inhomogeneous carrier distribution and was compared with the measured result. On this basis, the efficiency droop effect on the performance of a code division multiple access (CDMA) visible-light communication (VLC) system using GaN-based LEDs was also analyzed. The results reveal that the obvious transmitted signal error under the effect of LED efficiency droop leads to performance deterioration of multiuser CDMA VLC systems. Also, the performance of CDMA VLC systems is reduced with the user number increase due to LED efficiency droop. The bit error rate of a CDMA VLC system was further calculated for different branch signal levels and bias currents. It is demonstrated that the efficiency droop effect on the performance of CDMA VLC systems can be alleviated by adjusting the branch signal level and the bias current.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Huimin Lu ; Chaowen Yan ; Wei Gao ; Tongjun Yu and Jianping Wang
"Efficiency droop effects of GaN-based light-emitting diodes on the performance of code division multiple access visible-light communication system", Opt. Eng. 55(2), 027109 (Feb 25, 2016). ; http://dx.doi.org/10.1117/1.OE.55.2.027109


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