Semi-polar micro-LEDs have gain increasing interests due to the advantages of polarization control and quantum efficiency improvement. In this work, a novel semi-polar (20–21)-plane micro-LEDs array has been designed and manufactured. In comparison with c-plane micro-LEDs, semi-polar micro-LEDs indicate better electrical and optical performance. The relative EQE of semi-polar micro-LEDs remains at 62% under the injected current density of 775.6 A/cm2, which indicates a reduced efficiency droop due to less polarization in MQWs. It has been further proved by a significant reduction of 55% in emission peak blue-shift under the injected current density from 11.1 A/cm2 to 775.6 A/cm2. In addition, the carrier recombination dynamics and spatial light distribution of semi-polar micro-LEDs with different pixel sizes have been studied. Fast recombination lifetime in smaller size semi-polar micro-LEDs indicates a promising way to be used as a high modulation bandwidth light source. Stable and uniform light distribution in a wider range of spatial azimuths further supports for the semi-polar micro-LEDs as a strong candidate for the applications of high-resolution display and high-speed visible light communication.

/pdf/high-performance-semi-polar-ingan-gan-green-micro-light-2zi9mafdj3.pdf

High-Performance Semi-Polar InGaN/GaN Green Micro Light-Emitting Diodes

This article discusses the implementation of a wide band vectorial digital modulator and a tool to evaluate the Bit Error Rate. This modulator is capable of generate a wide band (up to 6.3 MHz) 16-QAM modulation in baseband. A second functionality programmed in the tool and reported in this article evaluates the Bit Error rate in order to measure the received signal quality. Results are validated using a Signal Analyzer.

16-QAM FPGA digital modulator and a tool to evaluate bit error rate

In this paper, the influence of disturbance light on visible light communication was investigated. A transmitter and a receiver of 4 pulse position modulation (4PPM) and π/4 differentially coherent quadrature phase-shift keying (π/4 DCQPSK) were fabricated and the bit error rates of the two modulation schemes were compared. This time, an incandescent bulb with a power consumption of 100 W was used as a disturbance light source. π/4 DCQPSK showed remarkable immunity against disturbance light compared with 4PPM.

Relationship between modulation method and immunity to disturbance light in visible light communication

In this paper, a bit error rate testing system has been developed and the transmission quality of visible light communication was studied. An optimization of reference voltage of the comparator was performed. A measured bit error rate was less than 10−7 without a disturbance light. This result indicates that the developed system is applicable in indoor communication. A bit error rate clearly became worse when the disturbance light was inserted. The results showed that this testing system is possible to evaluate quantitatively the effect of disturbance light. Signal to noise ratio (SNR) at the input of comparator was calculated, and measured bit error rate was plotted versus SNR. However, a difference between measurement and theoretical curve was observed. To reduce this difference, the review of noise source and the improvement of the mounting method for transmitter/receiver, will be required.

Evaluation of transmission quality of visible light communication using bit error rate measurement

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Evaluation of transmission quality of visible light communication using bit error rate measurement