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Radio-frequency low-coherence interferometry
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DOI：10.1364/OL.39.003634.png)
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Abstract
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A method for retrieving low-coherence interferograms, based on the use of a microwave photonics filter, is proposed and demonstrated. The method is equivalent to the double-interferometer technique, with the scanning interferometer replaced by an analog fiber-optics link and the visibility recorded as the amplitude of its radio-frequency (RF) response. As a low-coherence interferometry system, it shows a decrease of resolution induced by the fiber's third-order dispersion (beta(3)). As a displacement sensor, it provides highly linear and slope-scalable readouts of the interferometer's optical path difference in terms of RF, even in the presence of third-order dispersion. In a proof-of-concept experiment, we demonstrate 20-mu m displacement readouts using C-band EDFA sources and standard single-mode fiber. (C) 2014 Optical Society of America
Keywords:
SENSOR
FILTER
RESOLUTION
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OPTICS EXPRESS
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