Indoor optical wireless systems using PPM signaling

Hsun-Hung Chan; Jaafar M. H. Elmirghani; Robert A. Cryan

doi:10.1117/12.290397

10 October 1997 Indoor optical wireless systems using PPM signaling

Hsun-Hung Chan, Jaafar M. H. Elmirghani, Robert A. Cryan

Proceedings Volume 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III; (1997) https://doi.org/10.1117/12.290397
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States

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.

Citation Download Citation

Hsun-Hung Chan, Jaafar M. H. Elmirghani, and Robert A. Cryan "Indoor optical wireless systems using PPM signaling", Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); https://doi.org/10.1117/12.290397

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