FM-MRR Analog Audio System
NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
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In this work, we describe a hybrid free-space infrared communications link that supports audio transmission. The technique combines conventional frequency modulation FM techniques with optical amplitude modulation AM with a Multiple Quantum Well MQW Modulating Retroreflector MRR technology. The method has produced a robust, low power system capable of transmitting high quality audio information over a free space infrared link extending to multiple kilometers, depending on the characteristics of the TransmitReceiver interrogator and the sensor MRR unit at the data source.