High-Speed Full-Duplex Optical Wireless Communication System with Single Channel Imaging Receiver for Personal Area Networks

Ke WANG  Ampalavanapillai NIRMALATHAS  Christina LIM  Efstratios SKAFIDAS  

IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.2   pp.180-186
Publication Date: 2013/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.180
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Photonics Technology)
free space optical communications,  single channel imaging receiver,  full-duplex indoor wireless communications,  high-speed personal area networks,  

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In this paper, we propose a high-speed full-duplex optical wireless communication system using a single channel imaging receiver for personal area network applications. This receiver is composed of an imaging lens, a small sensitive-area photodiode, and a 2-aixs actuator and it can reject most of the background light. Compared with the previously proposed system with single wide field-of-view (FOV) non-imaging receiver, the coverage area at 12.5 Gb/s is extended by > 20%. Furthermore, since the rough location information of the user is available in our proposed system, instead of searching for the focused light spot over a large area on the focal plane of the lens, only a small possible area needs to be scanned. In addition, by pre-setting a proper comparison threshold when searching for the focused light spot, the time needed for searching can be further reduced. Proof-of-concept experiments have been carried out and the results show that with this partial searching algorithm and pre-set threshold, better performance is achieved.