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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 12 — Nov. 10, 2009

Terminal reflections in fiber-optic image guides

Pierre M. Lane  »View Author Affiliations


Applied Optics, Vol. 48, Issue 30, pp. 5802-5810 (2009)
http://dx.doi.org/10.1364/AO.48.005802


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Abstract

Fibered image guides for confocal reflectance endomicroscopy suffer from Fresnel reflections at the fiber terminals, which can limit signal-to-noise ratio in these systems. A model that describes these terminal reflections is presented to better understand how they can be managed most effectively. An expression for the refractive index of termination that minimizes the reflection as a function of the fiber’s normalized frequency is derived for step-index fibers, while a graphical solution is presented for graded-index fibers. The model predicts that terminal reflections from graded-index fibers are more sensitive to variations in fiber size and changes in wavelength than step-index fibers. A method is also presented to measure the refractive index that allows one to minimize the terminal reflections in an image guide. The technique uses the inherent mode coupling of the fibers in the image guide, allowing the isolation and measurement of reflections from only one end of the fiber. An achievable minimum backreflection of 36 dB was measured at 635 nm in a commercial image guide with 30,000 fibers.

© 2009 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(110.2350) Imaging systems : Fiber optics imaging
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.2150) Medical optics and biotechnology : Endoscopic imaging

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 15, 2009
Revised Manuscript: September 25, 2009
Manuscript Accepted: September 25, 2009
Published: October 16, 2009

Virtual Issues
Vol. 4, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Pierre M. Lane, "Terminal reflections in fiber-optic image guides," Appl. Opt. 48, 5802-5810 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-48-30-5802


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