Abstract
A micro-projection enabled short-range communication (SRC) approach using red-, green- and blue-based light-emitting diodes (RGB-LEDs) has experimentally demonstrated recently that micro-projection and high-speed data transmission can be performed simultaneously. In this research, a reconfigurable design of a polarization modulated image system based on the use of a Liquid Crystal on Silicon based Spatial Light Modulator (LCoS-based SLM) serving as a portable optical terminal capable of micro-projection and bidirectional multi-wavelength communications is proposed and experimentally demonstrated. For the proof of concept, the system performance was evaluated through a bidirectional communication link at a transmission distance over 0.65 m. In order to make the proposed communication system architecture compatible with the data modulation format of future possible wireless communication system, baseband modulation scheme, i.e., Non-Return-to-Zero On-Off-Keying (NRZ_OOK), M-ary Phase Shift Keying (M-PSK) and M-ary Quadrature Amplitude Modulation (M-QAM) were used to investigate the system transmission performance. The experimental results shown that an acceptable BER (satisfying the limitation of Forward Error Correction, FEC standard) and crosstalk can all be achieved in the bidirectional multi-wavelength communication scenario.
Highlights
With the increasing popularity of smartphone-based portable communication devices (PCDs) in the modern networked community, optical terminals based on these PCDs for applications in optical wireless communication technologies have received much attention since in the near future, over 4~ 5 billion smartphones and 2 billion active tablets are expected to access Internet service [1] either through wireless link at microwave frequencies or optical wireless link
A bidirectional multi-wavelength visible light communication link based on micro-projection enabled optical terminal (OT) at a transmission distance over 0.65 m were initially established to evaluate the system performance in our proof of concept experiments
The experimental works were conducted based on a half-duplex communication scenario, the proposed communication approach based on micro-projection enabled OTs can be applied to a full-duplex communication scenario through an appropriate design of LCoS-based SLM since each OT has identical physical components
Summary
With the increasing popularity of smartphone-based portable communication devices (PCDs) in the modern networked community, optical terminals based on these PCDs for applications in optical wireless communication technologies have received much attention since in the near future, over 4~ 5 billion smartphones and 2 billion active tablets are expected to access Internet service [1] either through wireless link at microwave frequencies or optical wireless link. A micro-projection enabled SRC system based on VLC technology providing a nearly gigabit data transmission rate has experimentally demonstrated and proposed to serve as an alternative communication approach for PCD application [10]. The work that was presented in [10] was based on one-way transmission, and multi-wavelengths were not transmitted simultaneously This encouraged the development of an optical terminal based on micro-projection architecture of PCD to establish a bidirectional optical wireless communication link for M2M or D2D applications. Optical terminal based on micro-projection architecture of PCD for bidirectional multi-wavelength visible light communication application is proposed and experimentally demonstrated
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