Fiber lattice accumulator design considerations for opitcal [sigma-delta] digital antennas
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Authors
Bewley, Scott A.
Subjects
ADC
Fiber Lattice Structures
Sigma-Delta
Directional Coupler
Oversampling
Optical ADC
Phase Coherent Modeling
Fiber Lattice Structures
Sigma-Delta
Directional Coupler
Oversampling
Optical ADC
Phase Coherent Modeling
Advisors
Pace, Phillip E.
Luscombe, James H.
Date of Issue
1998-12-01
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The ability to directly oversample and digitize microwave range signals at an antenna is not possible with current electronic technologies. The objective for this thesis was to design and computer model an optical sampling and digitization process using a mode-locked laser and fiber lattice accumulators. A novel fiber lattice accumulator design for integrated optical sigma-delta digital antenna technology is presented. The fiber lattice design uses phase modulation to produce the proper interference between input and recirculated/delayed optical pulses in order that they may coherently combine. In this manner, accumulation within the fiber lattice takes into account the sign of a sampled bipolar antenna signal. The fiber lattice performance is numerically evaluated within a first-order optical sigma-delta digital antenna phase coherent simulation. The initial computer simulations show promising results using lower frequency antenna signals to verify optical design feasibility and operation. Optical results closely matched all-electronic simulations. The error between the input antenna and output signals is quantified, and proves correct device performance. All results show the first- order optical sigma-delta does work and is ready for experimental construction. The significance of this device will be its usefulness in extending high resolution sigma-delta analog-to-digital conversion into the microwave signal bands
Type
Thesis
Description
Series/Report No
Department
Organization
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NPS Report Number
Sponsors
Funder
Format
ix, 59 p.;28 cm.
Citation
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Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.