Evaluation of coverage area for a wide line-of-sight indoor optical free-space communication system employing coherent detection [optical wireless communications]

Author

Jafar, M. ; Brien, D. C O ; Stevens, C.J. ; Edwards, D.J.

Author_Institution

Dept. of Electron. & Electr. Eng., Bath Univ., Bath

Volume

2

Issue

1

fYear

2008

fDate

1/1/2008 12:00:00 AM

Firstpage

18

Lastpage

26

Abstract

The application of coherent detection to indoor optical free-space communications is considered here. Analytical expressions are derived for a wide line-of-sight (W-LOS) optical link which determine the coverage area and the required photo-detection area given different binary digital transmission schemes and a given bit rate. The coverage area is maximised for systems using both metal-semiconductor-metal (MSM) and PIN photo-detectors. Results show that MSM photo-detectors, due to their inherently lower capacitance per unit photo-detection area, result in a greater coverage area than their PIN counterparts. To demonstrate the viability of implementing coherent detection indoors, a 200 Mb/s LOS optical link which uses coherent detection is also reported.

Keywords

optical communication; optical links; photodetectors; binary digital transmission scheme; coherent PIN photodetection; metal-semiconductor-metal; wide line-of-sight indoor optical free-space communication system; wide line-of-sight optical link;

fLanguage

English

Journal_Title

Communications, IET

Publisher

iet

ISSN

1751-8628

Type

jour

DOI

10.1049/iet-com:20060225

Filename

4446620