使用GaN紫光微LED实现10 Gb/s正交频分复用可见光通信

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"迈向10Gb/s正交频分复用基于GaN紫光微发光二极管的可见光通信" 本文研究的是一个旨在实现高速无线通信的创新技术，即可见光通信（Visible Light Communication，VLC）。随着无线连接需求的不断增长，VLC作为一种有潜力的解决方案，正逐渐受到关注。尤其是在这个研究中，研究人员特别强调了采用氮化镓（GaN）材料制成的微小尺寸发光二极管（micro-LEDs）在VLC中的应用，因为这种材料的微-LEDs具有极高的带宽，可以满足高速数据传输的需求。在本工作中，研究人员报道了一种分段的紫光微-LED，其电光带宽高达655MHz。这一特性使得这些微-LED在VLC系统中表现出优异的性能。为了进一步提升数据传输速率，他们采用了一种基于正交频分复用（Orthogonal Frequency Division Multiplexing，OFDM）的技术，并结合了自适应比特和能量加载策略。OFDM是一种多载波调制方法，通过将数据流分割成多个子载波，每个子载波独立调制，从而极大地提高了系统的频谱效率和数据传输能力。通过这样的系统设计，研究团队成功演示了一个数据传输速率为11.95 Gb/s的VLC系统，这已经非常接近于标题中提到的10 Gb/s的目标。这一成果不仅展示了GaN微-LED在高速VLC的潜力，也为未来实现更高速率的无线通信系统奠定了基础。此外，参与这项研究的机构来自不同国家的顶尖大学和研究中心，包括爱丁堡大学的Li-Fi研发中心、斯特拉斯克莱德大学的物理学院、剑桥大学的先进光子学和电子中心等，这些机构在无线通信和光子学领域有着深厚的背景和技术积累。总结来说，这项研究揭示了GaN紫光微-LED在实现高速OFDM-VLC系统中的关键作用，并通过实验验证了11.95 Gb/s的数据传输速率。这标志着我们在构建未来高速无线通信网络，尤其是利用可见光作为传输媒介的道路上迈出了重要的一步。同时，这也为照明设备提供了新的功能，使它们不仅可以提供光照，还能作为信息传输的载体，为物联网（IoT）和智能城市的发展开辟新的可能性。

Towards 10 Gb/s orthogonal frequency division

multiplexing-based visible light communication

using a GaN violet micro-LED

MOHAMED SUFYAN ISLIM,

,†

RICARDO X. FERREIRA,

2,†

XIANGYU HE,

2,†

ENYUAN XIE,

STEFAN VIDEV,

SHAUN VIOLA,

SCOTT WATSON,

NIKOLAOS BAMIEDAKIS,

RICHARD V. P ENTY,

IAN H. WHITE,

ANTHONY E. KELLY,

ERDAN GU,

HARALD HAAS,

AND MARTIN D. DAWSON

Li–Fi R&D Centre, the University of Edinburgh, Institute for Digital Communications, King’s Buildings, Mayfield Road, Edinburgh EH9 3JL, UK

Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow G1 1RD, UK

Institute for Digital Communications, Li–Fi R&D Centre, the University of Edinburgh, King’s Buildings, Mayfield Road, Edinburgh EH9 3JL, UK

School of Engineering, University of Glasgow, Glasgow G12 8LT, UK

Centre for Advanced Photonics and Electronics, Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge

CB3 0FA, UK

*Corresponding author: m.islim@ed.ac.uk

Received 28 November 2016; revised 9 February 2017; accepted 9 February 2017; posted 10 February 2017 (Doc. ID 280671);

published 28 March 2017

Visible light communication (VLC) is a promising solution to the increasing demands for wireless connectivity.

Gallium nitride micro-sized light emitting diodes (micro-LEDs) are strong candidates for VLC due to their high

bandwidths. Segmented violet micro-LEDs are reported in this work with electrical-to-optical bandwidths up to

655 MHz. An orthogonal frequency division multiplexing-based VLC system with adaptive bit and energy loading

is demonstrated, and a data transmission rate of 11.95 Gb/s is achieved with a violet micro-LED, when the non-

linear distortion of the micro-LED is the domi nant noise source of the VLC system. A record 7.91 Gb/s data

transmission rate is reported below the forward error correction threshold using a single pixel of the segmented

array when all the noise sources of the VLC system are present.

OCIS codes: (060.4510) Optical communications; (060.2605) Free-space optical communication; (230.3670) Light-emitting diodes;

(230.3990) Micro-optical devices.

https://doi.org/10.1364/PRJ.5.000A35

1. INTRODUCTION

The increasing demands of communication services are chal-

lenging radio frequency (RF) wireless communications technol-

ogies. The overall number of networked devices is expected to

reach 26.3 billion in 2020 [1]. Visible light communication

(VLC) is a promising solution to the limited availability of the

RF spectrum as the visible light spectrum offers abundant

bandwidth that is unlicensed and free to use. VLC improves

the spectral efficiency per unit area, which enhances the quality

of service in crowded environments and allows for secure and

localized services to be provided.

General lighting is under a rapid transformation to become

semiconductor based due to huge energy savings. This trans-

formation has already enabled applications such as active energy

consumption control and color tuning. Solid state lighting

devices such as gallium nitride (GaN)-based inorganic light

emitting diodes (LEDs) are ubiquitous power-efficient devices

to enable illumination and communications. Commercially

available LEDs have a limited frequency response due to the

yellow phosphor coating on top of the blue LED chips. How-

ever, the slow response of the yellow phosphor can be filtered

out using a blue filter in front of the receiver. Recent results

for VLC using a phosphorescent white LED with adaptive bit

and energy loading were reported at 2.32 Gb/s aided by a two-

staged linear software equalizer [2].

Micro-LEDs are promising candidates in enabling lighting

as a service (LaaS) and Internet of things (IoT). The introduc-

tion of micro-LEDs has enabled high-performance value-added

lighting functions such as VLC and indoor positioning and

tracking [3]. Micro-LEDs are known for their small active areas

enabling high current density injection, which drives the

modulation bandwidth to hundreds of megahertz [4,5]. At

450 nm, micro-LEDs have set the standard for high-speed

VLC. A 60 μm diameter pixel has achieved 3 Gb/s [6], and

more recently a single pixel of a new segmented array has

demonstrated 5 Gb/s [7]. The novel micro-LEDs emitting at

Research Article

Vol. 5, No. 2 / April 2017 / Photonics Rese arch A35

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