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Instantaneous quadrature low-coherence interferometry with 3x3 fiber-optic couplers

Choma, Michael A. and Yang, Changhuei and Izatt, Joseph A. (2003) Instantaneous quadrature low-coherence interferometry with 3x3 fiber-optic couplers. Optics Letters, 28 (22). pp. 2162-2164. ISSN 0146-9592.

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We describe fiber-based quadrature low-coherence interferometers that exploit the inherent phase shifts of 3 x 3 and higher-order fiber-optic couplers. We present a framework based on conservation of energy to account for the interferometric shifts in 3 x 3 interferometers, and we demonstrate that the resulting interferometers provide the entire complex interferometric signal instantaneously in homodyne and heterodyne systems. In heterodyne detection we demonstrate the capability for extraction of the magnitude and sign of Doppler shifts from the complex data. In homodyne detection we show the detection of subwavelength sample motion. N x N (N> 2) low-coherence interferometer topologies will be useful in Doppler optical coherence tomography (OCT), optical coherence microscopy, Fourier-domain OCT, optical frequency domain reflectometry, and phase-referenced interferometry.

Item Type:Article
Additional Information:© 2003 Optical Society of America Received May 30, 2003 This work was supported by National Institutes of Health grant R24-EB000243.
Subject Keywords:Optical coherence tomography; Interferometry
Record Number:CaltechAUTHORS:CHOol03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3334
Deposited By: Archive Administrator
Deposited On:31 May 2006
Last Modified:08 Dec 2014 23:21

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