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Proceedings Paper

Indoor optical wireless systems using PPM signaling
Author(s): Hsun-Hung Chan; Jaafar M. H. Elmirghani; Robert A. Cryan
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Paper Abstract

A new hybrid optical wireless system based on pulse position modulation (PPM) and PIN-BJT receivers is proposed and its performance is evaluated. The system is operated at a bit rate of 10 Mbit/s and (lambda) equals 0.85 micrometer. The receiver achieves a low noise current of about 2.7 pA/(root)Hz. Original results are presented demonstrating that the system can achieve a sensitivity of -50.5 dBm at an error rate of 10-9. This represents a sensitivity improvement of 9.8 dB over a comparable ON OFF keying (OOK) PIN-BJT system. This paper also shows that shot noise, from background light, can reduce sensitivity by about 10.2 dB - 5.4 dB when the background light power is around 5 mW - 0.5 mW and hence careful consideration has been given to ambient noise. The overall sensitivity enhancement has significant impact on the optical wireless network, where the maximum allowed transmitted power is limited by safety issues and background noise. Moreover, the use of PPM offers other advantages such as the low average power which is suited for battery operation and a high peak power that aids detection.

Paper Details

Date Published: 10 October 1997
PDF: 11 pages
Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); doi: 10.1117/12.290397
Show Author Affiliations
Hsun-Hung Chan, Univ. of Northumbria/Newcastle (United Kingdom)
Jaafar M. H. Elmirghani, Univ. of Northumbria/Newcastle (United Kingdom)
Robert A. Cryan, Univ. of Northumbria/Newcastle (United Kingdom)

Published in SPIE Proceedings Vol. 3230:
All-Optical Communication Systems: Architecture, Control, and Network Issues III
John M. Senior; Robert A. Cryan; Chunming Qiao, Editor(s)

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