Dual use of LED traffic signal system

Yau-Yee Tam; C. W. Mike Man; David Yang; S. W. Cheung; Edward S. Yang

doi:10.1117/12.368202

5 October 1999 Dual use of LED traffic signal system

Yau-Yee Tam, C. W. Mike Man, David Yang, S. W. Cheung, Edward S. Yang

Proceedings Volume 3779, Current Developments in Optical Design and Optical Engineering VIII; (1999) https://doi.org/10.1117/12.368202
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Yau-Yee Tam, C. W. Mike Man, David Yang, S. W. Cheung, and Edward S. Yang "Dual use of LED traffic signal system", Proc. SPIE 3779, Current Developments in Optical Design and Optical Engineering VIII, (5 October 1999); https://doi.org/10.1117/12.368202

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