Utilization of 1 GHz VCSEL for 11.1 Gbps OFDM VLC Wireless Communication
In this paper, we propose using an energy efficient and low cost 682 nm vertical cavity surface emitting laser (VCSEL) with 1 GHz modulation bandwidth for high speed wireless visible light communication (VLC) Moreover, by using spectral efficient orthogonal frequency division multiplexing (OFDM) modulation with bit and power loading algorithm, we successfully demonstrate VCSEL based transmission at 11.1 Gbps (10.2 Gbps in a raw data rate) over a free space length of 1.2 m under small bias current of 3.5 mA. Furthermore, decreasing the bias current as low as 2 mA, we can also demonstrate 10.5 Gbps (9.7 Gbps in a raw data rate) OFDM VLC transmission over a 1.2 m free space link. This proposed VCSEL based OFDM transmission system could be viewed as a cost effective and energy efficient approach for high speed 10 Gbps) laser diode wireless VLC application.
IEEE Photonics Journal