Simultaneous wideband transmission of five FDM signals over a fiber optic link
Dimopoulos, Ilias K.
Powers, John P.
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The purpose of this project was the design, construction and testing of a fiber optic communication link for the simultaneous transmission of five audio signals using the technique of frequency division multiplexing. The five subcarrier frequencies were between 1 and 10 MHz. Amplitude modulation with two sidebands and suppressed carrier using an analog voltage multiplier (AD834) was chosen for efficient transmission through the fiber. The unwanted image signals and intermodulation products from the mixing operation were removed using active bandpass filters. An interesting result was the successful design and operation of active filters at the high frequencies using the Generalized Immitance Converter (GIC) configuration. An LED and pin-photodiode pair was used for the optical portion of the link. Simulated link distances of up to 3.2 kilometers were attained using these components. A constant gain for signal frequencies ranging between 200 Hz and 20 kHz was observed during the operation of the system with all the five channels working simultaneously.
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