Structured gallium nitride LED light sources for visible light communications.

该项目专注于开发用于LiFi和可见光通信（VLC）应用的新型结构光源。基于led的固态照明为新形式的无线通信基础设施提供了令人兴奋的前景，以补充现有的WiFi并提供额外的部署机会和功能。其基本思想是基于半导体技术的led固态照明，可以非常有效地与先进的（CMOS）控制电子设备接口，因此可以直接在电子控制下以复杂的方式运行，实际上促进了“数字”照明的出现。特别是，单个微尺寸led的直接数据调制的组合可以与这些光源阵列的能力相结合，以创建复杂的时空照明模式，促进通信和室内导航功能的组合，并实现空间和频谱多路复用。在过去的几年里，在EPSRC的支持下，我们建立了电子接口氮化镓led性能的新基准。我们已经证明，单个微像素GaN led可以具有超过1Gb/s的调制带宽，并且通过适当的高级数据编码，可以传输超过10Gb/s的数据速率。这些高数据速率是通过改变LED像素的几何形状来实现的，我们需要了解这种效果背后的物理机制，同时也要探索进一步的形状变化和其他效果，看看数据速率是否可以进一步提高。此外，我们才刚刚开始了解由光源阵列产生的结构光图案的含义。进一步的工作需要探索新的空间和光谱数据编码方法，并将它们与结构化照明的能力相结合，以定位和跟踪物体。该项目将与牛津大学、剑桥大学、圣安德鲁斯大学和爱丁堡大学等外部合作大学合作，探索所有这些问题。

This project focuses on the development of novel structured light sources for LiFi and visible light communications (VLC) applications. LED-based solid-state lighting offers exciting prospects for new forms of wireless communications infrastructure, to complement existing WiFi and provide additional deployment opportunities and functionality. The basic idea is that LED-based solid-state lighting, being based on semiconductor technology, can interface very effectively to advanced (CMOS) control electronics and can therefore operate in a sophisticated manner directly under electronic control, in effect facilitating the emergence of 'Digital' Lighting. In particular, a combination of direct data modulation of individual LEDs of micro-sized dimensions can be combined with the ability of arrays of these sources to create complex spatio-temporal illumination patterns, facilitating a combination of communications and indoor navigation functions and implementing spatial and spectral multiplexing.We have, over the past few years under EPSRC support, established new benchmarks in the performance of electronically interfaced gallium nitride LEDs. We have shown that individual micro-pixel GaN LEDs can have modulation bandwidths in excess of 1Gb/s and, with appropriate advanced data encoding, transmit data rates at beyond 10Gb/s. These high data rates have been achieved with a change of geometry in the LED pixels, and we need to understand the physical mechanisms behind this effect, whilst also exploring further shape change and other effects to see if the data rate can be pushed any further. In addition, we have only begun to understand the implications of structured light patterning produced by arrays of our sources. Much further work needs to be done to explore new spatial and spectral data encoding methods and in combining them with the ability of structured lighting to locate and track objects. This studentship will explore all of these issues, in collaboration with external partner universities including Oxford, Cambridge, St Andrews and Edinburgh.