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Proceedings Paper

Dual use of LED traffic signal system
Author(s): Yau-Yee Tam; C. W. Mike Man; David Yang; S. W. Cheung; Edward S. Yang
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Paper Abstract

The dual use, signaling and communication, of LED traffic signal system is described and analyzed. The primary function of a traffic light system is to give traffic and pedestrian signals. A prototype of LED traffic signal head is developed to perform a secondary function: communication. A wireless communication link is set up using the LED traffic signal head as the transmitter. The LEDs are modulated to transmit information-carrying light. The receiver uses a silicon photodiode to detect the transmitted radiation. Using visible light as the transmission medium, a 1 Mbit/s wireless data link is obtained.

Paper Details

Date Published: 5 October 1999
PDF: 11 pages
Proc. SPIE 3779, Current Developments in Optical Design and Optical Engineering VIII, (5 October 1999); doi: 10.1117/12.368202
Show Author Affiliations
Yau-Yee Tam, Univ. of Hong Kong (Hong Kong)
C. W. Mike Man, Univ. of Hong Kong (Hong Kong)
David Yang, Univ. of Hong Kong (Hong Kong)
S. W. Cheung, Univ. of Hong Kong (Hong Kong)
Edward S. Yang, Univ. of Hong Kong (Hong Kong)


Published in SPIE Proceedings Vol. 3779:
Current Developments in Optical Design and Optical Engineering VIII
Robert E. Fischer; Warren J. Smith, Editor(s)

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