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This paper describes a simple optical wavelength-division-multiplexed (WDM) signal transmission system, consisting of a dual-channel-color LED assembly, a plastic optical fiber with a length of 5 m, a dual-channel-color sensor assembly, a crosstalk elimination circuit, and other electronic circuits. This system transmits a pair of separate analog signals at frequencies of DC to 10 kHz from the transmitter to the receiver through the optical fiber without the use of expensive optical couplers. The performance was such that the distortion factors was below 2 % and the crosstalk was below -40 dB. This system was experimentally applied to transmit data of mechanical vibration from a pair of vibration sensors attached to a printed circuit board under test to the monitoring instrument in order to separately readout the forced vibration and natural vibration. The experiment was successful.

Dual Signal Transmission Utilizing Optical WDM Consisting of an LED Assembly and a Color Sensor Assembly And Its Application to Vibration Measurement