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

M Jafar, D C O'Brien, C J Stevens, D J Edwards

Research output: Contribution to journalArticle

17 Citations (Scopus)

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 (NISM) 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.
Original languageEnglish
Pages (from-to)18-26
Number of pages9
JournalIET Communications
Volume2
Issue number1
DOIs
Publication statusPublished - 2008

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