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Modeling an evanescent field absorption optical fiber sensor
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Paper Abstract

Using the weakly guiding and exact field solutions of an optical fiber, we wrote a FORTRAN program to determine the fractional power that reaches the end of an optical fiber with an absorptive cladding. We have assumed that each mode of the fiber is equally excited. This corresponds to incoherent source excitation. The results were compared to a previous approximations published in the literature. We have found that, at low V-numbers, V < 20, Payne and Hale's approximation deviate by more than 20% from the weakly guiding solution. At high V-numbers, the approximation deviated by less than 10%. When compared to Payne and Hale's approximation, both the weakly guiding and exact solutions are closer to the data points obtained experimentally by Degrandpre and Burgess. Although closer than Payne and Hale's approximation, our solution still deviates from Degrandpre and Burgess' results. The difference may be due to the assumption that all modes were excited equally. Another possibility was the fact that we have neglected leaky modes in our treatment.

Paper Details

Date Published: 29 September 1995
PDF: 7 pages
Proc. SPIE 2508, Chemical, Biochemical, and Environmental Fiber Sensors VII, (29 September 1995); doi: 10.1117/12.221752
Show Author Affiliations
Claudio Oliveira Egalon, Analytical Services and Materials, Inc. (United States)
Edgar A. Mendoza, Physical Optics Corp. (United States)
Albert N. Khalil, Physical Optics Corp. (United States)
Robert A. Lieberman, Physical Optics Corp. (United States)

Published in SPIE Proceedings Vol. 2508:
Chemical, Biochemical, and Environmental Fiber Sensors VII
Annamaria V. Scheggi, Editor(s)

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