November 2021
Spotlight Summary by Harald Haas
Ultrafast 2 × 2 green micro-LED array for optical wireless communication beyond 5 Gbit/s
Multi-gigabit-per-second (Gbps) data rates delivered by high bandwidth, spectrally stable micro LEDs in the visible light spectrum will unlock new applications. For instance, the raw data rate required for augmented reality headsets to produce human perception quality vision is 1 terabit per second. If compressed, this data rate would still be 4 Gbps. It is, therefore, essential to develop technologies that allow these kinds of data rates. The visible light spectrum is an ideal candidate for this purpose.
However, for full exploitation of the available visible light spectrum, the opto-electrical conversion efficiency at ultra-high electrical bandwidth remains a fundamental challenge. This paper presents a new 2x2 micro LED array that provides an effective solution to the quantum-confined Stark effect, which typically reduces the emission efficiency under high injected current densities. It also leads to a spectral shift that reduces the possible gains of wavelength division multiplexing due to the wide emission spectrum. This issue is elegantly reduced. Moreover, due to the segmented design of the device the electrical 3-dB bandwidth is 800 MHz which constitutes a major improvement. It is envisaged that with enhanced digital modulation techniques, this device could be able to achieve data rates close to 10 Gbps.
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However, for full exploitation of the available visible light spectrum, the opto-electrical conversion efficiency at ultra-high electrical bandwidth remains a fundamental challenge. This paper presents a new 2x2 micro LED array that provides an effective solution to the quantum-confined Stark effect, which typically reduces the emission efficiency under high injected current densities. It also leads to a spectral shift that reduces the possible gains of wavelength division multiplexing due to the wide emission spectrum. This issue is elegantly reduced. Moreover, due to the segmented design of the device the electrical 3-dB bandwidth is 800 MHz which constitutes a major improvement. It is envisaged that with enhanced digital modulation techniques, this device could be able to achieve data rates close to 10 Gbps.
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Article Information
Ultrafast 2 × 2 green micro-LED array for optical wireless communication beyond 5 Gbit/s
Gong-Ru Lin, Hao-Chung Kuo, Chih-Hsien Cheng, Yi-Chien Wu, Yu-Ming Huang, Fang-Jyun Liou, and Yi-Che Lee
Photon. Res. 9(10) 2077-2087 (2021) View: Abstract | HTML | PDF