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Detection, Evaluation, and Optimization of Optical Signals Generated by Fiber Optic Bragg Gratings Under Dynamic ExcitationsThe dynamic response of a fiber optic Bragg grating to mechanical vibrations is examined both theoretically and experimentally. The theoretical expressions describing the consequences of changes in the grating's reflection spectrum are derived for partially coherent beams in an interferometer. The analysis is given in terms of the dominant wavelength, optical bandwidth, and optical path difference of the interfering signals. Changes in the reflection spectrum caused by a periodic stretching and compression of the grating were experimentally measured using an unbalanced Michelson interferometer, a Michelson interferometer with a non-zero optical path difference. The interferometer's sensitivity to changes in dominant wavelength of the interfering beams was measured as a function of interferometer unbalance and was compared to theoretical predictions. The theoretical analysis enables the user to determine the optimum performance for an unbalanced interferometer.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Adamovsky, Grigory
(NASA Glenn Research Center Cleveland, OH United States)
Lekki, John
(NASA Glenn Research Center Cleveland, OH United States)
Lock, James A.
(Cleveland State Univ. Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
August 1, 2002
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:211565
Funding Number(s)
PROJECT: RTOP 704-30-13
Distribution Limits
Public Use Permitted.
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