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Optics Letters

Optics Letters

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  • Vol. 28, Iss. 22 — Nov. 15, 2003
  • pp: 2162–2164

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

Michael A. Choma, Changhuei Yang, and Joseph A. Izatt  »View Author Affiliations


Optics Letters, Vol. 28, Issue 22, pp. 2162-2164 (2003)
http://dx.doi.org/10.1364/OL.28.002162


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Abstract

We describe fiber-based quadrature low-coherence interferometers that exploit the inherent phase shifts of 3×3 and higher-order fiber-optic couplers. We present a framework based on conservation of energy to account for the interferometric shifts in 3×3 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×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.

© 2003 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(120.3180) Instrumentation, measurement, and metrology : Interferometry

Citation
Michael A. Choma, Changhuei Yang, and Joseph A. Izatt, "Instantaneous quadrature low-coherence interferometry with 3×3 fiber-optic couplers," Opt. Lett. 28, 2162-2164 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-22-2162


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