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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 2 — Jan. 10, 2007
  • pp: 253–261

Coupling and cross-talk effects in 12–15 μm diameter single-mode fiber arrays for simultaneous transmission and photon collection from scattering media

Yuan Luo, Jose Castillo, Lina Arauz, Jennifer Barton, and Raymond K. Kostuk  »View Author Affiliations


Applied Optics, Vol. 46, Issue 2, pp. 253-261 (2007)
http://dx.doi.org/10.1364/AO.46.000253


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Abstract

We examine signal degradation effects in fiber arrays from fiber-to-fiber coupling and from cross talk attributable to backscatter from the sample medium originating from adjacent fibers in the array. An analysis of coupling and cross talk for single-mode fibers (SMFs) operating at 1310 nm with different core diameters, interaction lengths, core center spacing, and numerical apertures (NAs) is evaluated. The coupling was evaluated using beam propagation algorithms and cross talk was analyzed by using Monte Carlo methods. Several multimode fiber types that are currently used in fiber image guides were also evaluated for comparative purposes. The analysis shows that an optimum NA and core diameter can be found for a specific fiber center separation that maximizes the directly backscattered signal relative to the cross talk. The coupling between fibers can be kept less than 35 dB for interaction lengths less than 5 mm . The calculations were compared to an experimentally fabricated SMF array with 15 μm center spacing and showed good agreement. The experimental fiber array without a lens was also used in a coherent detection configuration to measure the position of a mirror. Accurate depth ranging up to a distance of 250 μ m from the tip of the fiber was achieved, which was five times the Rayleigh range of the beam emitted from the fiber.

© 2007 Optical Society of America

OCIS Codes
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.2150) Medical optics and biotechnology : Endoscopic imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: February 16, 2006
Revised Manuscript: May 25, 2006
Manuscript Accepted: September 7, 2006

Virtual Issues
Vol. 2, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Yuan Luo, Jose Castillo, Lina Arauz, Jennifer Barton, and Raymond K. Kostuk, "Coupling and cross-talk effects in 12-15 μm diameter single-mode fiber arrays for simultaneous transmission and photon collection from scattering media," Appl. Opt. 46, 253-261 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-2-253


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