Chou Hsi-Hsir, Tsai Cheng-Yu, Jiang Jhih-Shan
Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Sensors (Basel). 2018 Mar 26;18(4):983. doi: 10.3390/s18040983.
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.
一种使用红、绿、蓝发光二极管（RGB-LED）的微投影短程通信（SRC）方法最近通过实验证明了微投影和高速数据传输可以同时进行。在本研究中，提出并通过实验证明了一种基于使用硅基液晶空间光调制器（基于LCoS的SLM）的偏振调制图像系统的可重构设计，该系统作为一种能够进行微投影和双向多波长通信的便携式光学终端。为了验证概念，通过在传输距离超过0.65米的双向通信链路评估了系统性能。为了使所提出的通信系统架构与未来可能的无线通信系统的数据调制格式兼容，使用了基带调制方案，即非归零开关键控（NRZ_OOK）、多进制相移键控（M-PSK）和多进制正交幅度调制（M-QAM）来研究系统传输性能。实验结果表明，在双向多波长通信场景中可以实现可接受的误码率（满足前向纠错FEC标准的限制）和串扰。
