Abstract-Visible light communications (VLC) has the potential to play a major part in future smart home and next generation communication networks. There is significant ongoing work to increase the achievable data rates using VLC, to standardize it and integrate it within existing network infrastructures.The future of VLC systems depends on the ability to fabricate low cost transceiver components and to realize the promise of high data rates. This paper reports the design and fabrication of integrated transmitter and receiver components. The transmitter uses a two dimensional individually addressable array of micro light emitting diodes (µLEDs) and the receiver uses an integrated photodiode array fabricated in a CMOS technology. A preliminary result of a MIMO system implementation operating at a data rate of ~1Gbps is demonstrated. This paper also highlights the challenges in achieving highly parallel data communication along with the possible bottlenecks in integrated approaches. IndexTerms-Visible light communications, Optical communication system design, multiple input multiple output, optical wireless communications, link budget analysis, integrated optical system design.

In this paper, we report the performance of an imaging multiple input multiple output (MIMO) visible light communication (VLC) system. The VLC transmitter consists of a two-dimensional, individually addressable Gallium Nitride micro light emitting diode (µLED) array. The receiver uses a two-dimensional avalanche photodiode (APD) array fabricated using complementary metal oxide semiconductor (CMOS). Using integrated CMOS-based LED drivers, a data rate greater than 1 Gbps was obtained at a link distance of 1 m with the system field of view (FOV) of 3.45 degree using four channels. At a reduced link distance of 0.5 m, a data rate of 7.48 Gbps was obtained using a nine channel MIMO system. This demonstrates the feasibility of compact MIMO systems which offer substantial data rates. Index Terms-Visible light communications, multiple input multiple output, VLC demonstrator, integrated VLC I. INTRODUCTION Visible light communications (VLC) systems, realized using solid-state lighting (SSL) devices, can offer high-speed data communication in addition to their primary purpose of illumination. With the white light emitting diodes (LEDs) expected to be the dominant illumination device in the home and office environment in the near future, the use of VLC systems will grow exponentially over the coming decades [1]. As a result, there has been significant research and commercial interest in VLC systems over the last ten years (see [2] for the detailed review). This is largely due to several key advantages that VLC offers in comparison to the existing radio frequency (RF) technology, including license-free operation, high available bandwidth, high spatial diversity, innate security, and controlled beam shaping. Phosphor based white LEDs have a low communication bandwidth (a few MHz) due to the long photoluminescence lifetimes of the phosphor [3]. The bandwidth of the blue LED itself is limited to 20-30 MHz. Using pre and post-equalisation for on-off keying (OOK) modulation, a data rate of 550 Mbps M anuscript

No abstract

Multiple-input multiple-output (MIMO) transmission can be used to increase the throughput of visible light communication (VLC) systems. This approach is highly compatible with the use of arrays of micro light emitting diodes (µLEDs).In this work, we demonstrate an imaging-MIMO VLC system using a two dimensional individually addressable array of µLEDs and an integrated CMOS-based receiver. An aggregate data rate of ~920 Mbps is realized using four parallel channels at a link distance of 1 m. Further improvement in the data rates is feasible by optimizing the system components and operating conditions.

No abstract