Optimized design of narrow spectral linewidth nonpolar m-plane InGaN/GaN micro-scale light-emitting diode
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RESEARCH ARTICLE
Optimized design of narrow spectral linewidth nonpolar m-plane InGaN/GaN micro-scale light-emitting diode Lokesh Sharma1 • Ritu Sharma1
Received: 9 January 2020 / Accepted: 13 July 2020 The Optical Society of India 2020
Abstract In this paper, a non-polar InGaN/GaN LED, which is oriented in the direction of the m-plane, is simulated through the TCAD tool. The In-GaN/GaN LED device reported in this paper is designed and optimized to modify its characteristic parameters to achieve narrow linewidth. Device simulation of LED is carried out in an LED simulator and extracted data is represented in the form of graphs. This paper has a prime focus on the linewidth of LEDs. After optimization of design, the linewidth of LED is reduced from 32 nm (calculated graphically by measuring - 3 db linewidth) to 5 nm. In addition to linewidth optimization, the impact of the device dimension and Inx Ga1x N mole fraction, on peak wavelength and maximum amplitude is reported. The significance of reducing the linewidth is that it reduces the material dispersion in optical fiber communication systems operated with LEDs. Material dispersion is a mechanism which limits the capacity of optical fibers. Hence, it improves the performance of the optical fiber and reduces the power consumption and hence it improve the overall performance and efficiency of the communication systems. Keywords El-electro luminance Linewidth Multi quantum well Optical bandwidth Radio frequency Visible light communication
& Ritu Sharma [email protected] Lokesh Sharma [email protected] 1
Malviya National Institute of Information Technology, Jaipur, India
Introduction As the population is increasing continuously, demand for mobile communication is also rising with the same rate [1, 2], to support it, new technologies are required which can support the existing framework and updated technologies as well. Nowadays, Visible light communication (VLC), Light Fidelity (Li-Fi), Free-space optical communication (FSO), etc. are very common terms in the communication industry. These techniques are the backbone of not only the current technologies in the communication industry but also of the upcoming latest technologies [3]. All these communication techniques have some sort of similarity among them. When we talk about VLC, an illumination source (e.g. a light bulb) transmits information using the visible light signal and thus any exchange of information that is done by using a visible light signal can be considered as VLC. LEDs are used as a source of light in VLC systems as it can transmit data at a very high speed. Unlike fluorescent and incandescent lamps, LEDs can switch at a very high speed and provide data communication at a nominal cost and consume less power [4–9]. Micro-scale LEDs which are specially designed for highspeed operation have obtained large modulation bandwidths ranging from hundreds of MHz to one GHz and thus provide higher data communication rates [7–9]. As a result, LED is dominating the market and creating mu
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