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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 3 — Mar. 1, 2014
  • pp: 475–479

Evanescent field characteristics of eccentric core optical fiber for distributed sensing

Jianxia Liu and Libo Yuan  »View Author Affiliations


JOSA A, Vol. 31, Issue 3, pp. 475-479 (2014)
http://dx.doi.org/10.1364/JOSAA.31.000475


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Abstract

Fundamental core-mode cutoff and evanescent field are considered for an eccentric core optical fiber (ECOF). A method has been proposed to calculate the core-mode cutoff by solving the eigenvalue equations of an ECOF. Using conformal mapping, the asymmetric geometrical structure can be transformed into a simple, easily solved axisymmetric optical fiber with three layers. The variation of the fundamental core-mode cut-off frequency (Vc) is also calculated with different eccentric distances, wavelengths, core radii, and coating refractive indices. The fractional power of evanescent fields for ECOF is also calculated with the eccentric distances and coating refractive indices. These calculations are necessary to design the structural parameters of an ECOF for long-distance, single-mode distributed evanescent field absorption sensors.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(260.2110) Physical optics : Electromagnetic optics
(350.7420) Other areas of optics : Waves
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: November 1, 2013
Revised Manuscript: December 21, 2013
Manuscript Accepted: December 22, 2013
Published: February 5, 2014

Citation
Jianxia Liu and Libo Yuan, "Evanescent field characteristics of eccentric core optical fiber for distributed sensing," J. Opt. Soc. Am. A 31, 475-479 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-3-475


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