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S Gillespie PhaseNoise_v13 final format approved LW 4-29-14.pdf (6.16 MB)
ETD Abstract Container
Abstract Header
Characterizing Phase Noise for Beam Steering Devices
Author Info
Gillespie, Shane Matthew
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398785413
Abstract Details
Year and Degree
2014, Master of Science (M.S.), University of Dayton, Electro-Optics.
Abstract
In this thesis we assemble a type of Mach-Zehnder interferometer to measure the complex signal after passage through a device under test placed in one arm. The signal's phase is extracted from the complex signal dataset and is analyzed to study the phase noise added due to the device. We are studying a liquid crystal beam steering system, which is a combination of two optical devices; the first is a variable liquid crystal half-waveplate and the second is a liquid crystal phase grating. The variable liquid crystal waveplate is the active element that has voltages applied to achieve a specific birefringence, whereas the liquid crystal phase grating is a passive device. For the beam steering devices of interest the liquid crystal phase grating is passive and therefore unlikely to impart appreciable amounts of phase noise, so the focus of this research was on the potential phase noise due to variable liquid crystal waveplate. The phase noise using the variable liquid crystal waveplate is measured in three operational states: a non-energized off state, an energized state having zero-phase change,and an energized state with voltage set for a half-wave phase change. We examine the phase spectrum |Φ(ƒ)|
2
, obtained from the frequency analysis of the temporal phase. A comparison is made between the phase noise spectrums in several cases: pre-device insertion to a post-device insertion of the variable liquid crystal waveplate for the three different states. We examine the signal spectrum over frequencies spanning the range from 1 Hz to 10
7
Hz and tentatively conclude that the active devices add little additional noise to the system. Further data is needed to solidify this conclusion given the data being analyzed is from one data capture, and the system required readjustment between captures, and we observe a drift of the noise floor.
Committee
Joseph Haus, Ph.D. (Committee Chair)
Paul McManamon, Ph.D. (Committee Member)
Tim Finegan (Committee Member)
David Rabb (Committee Member)
Pages
70 p.
Subject Headings
Military Studies
;
Optics
;
Technology
Keywords
phase noise
;
beam steering
;
liquid crystal polarization gratings
;
mach zehnder
;
interferometry
;
polarization IQ
;
Recommended Citations
Refworks
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Citations
Gillespie, S. M. (2014).
Characterizing Phase Noise for Beam Steering Devices
[Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398785413
APA Style (7th edition)
Gillespie, Shane .
Characterizing Phase Noise for Beam Steering Devices.
2014. University of Dayton, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398785413.
MLA Style (8th edition)
Gillespie, Shane . "Characterizing Phase Noise for Beam Steering Devices." Master's thesis, University of Dayton, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398785413
Chicago Manual of Style (17th edition)
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Document number:
dayton1398785413
Download Count:
3,394
Copyright Info
© 2014, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.