A Passive Visible Light Transponder Using an LED for an Optical Transceiver

Title & Authors
A Passive Visible Light Transponder Using an LED for an Optical Transceiver
Lee, Seong-Ho;

Abstract
In this paper, we introduce a passive transponder in which an LED is used for both a light transmitter and a receiver, and a solar cell is used for supplying power to the all devices in the transponder. The LED in the transponder operates as a photodetector in the receiving mode, and acts as a light source in the transmitting mode. The current responsivity of the LED detector was measured to be in the order of $\small{10^{-4}A/W}$, and the receiving bandwidth with a load resistance of $\small{10k{\Omega}}$ was about 10 to 30 kHz. Using the LED for an optical transceiver in a VLID transponder, the detection range was about 70 cm when the transponder was illuminated by the visible light from a $\small{3{\times}3}$ LED array in a reader.
Keywords
LED;Solar cell;Passive transponder;Visible light identification;LED detector;
Language
Korean
Cited by
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