Simultaneous wideband transmission of five FDM signals over a fiber optic link
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Authors
Dimopoulos, Ilias K.
Subjects
Optical analog communications
Fiber optic communications
Frequency division multiplexing
FDM
Amplitude modulation
Active bandpass filter
Generalized immitance converter
GIC
Fiber optic communications
Frequency division multiplexing
FDM
Amplitude modulation
Active bandpass filter
Generalized immitance converter
GIC
Advisors
Powers, John P.
Date of Issue
1989-12
Date
December 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Department of Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
71 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner