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Optical Engineering

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 approximation published by Payne and Hale in 1993. 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 deviates 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 in 1988. Although closer than Payne and Hale's approximation, our solution still deviates from the Degrandpre and Burgess results. The difference may result from 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: 1 December 1995
PDF: 4 pages
Opt. Eng. 34(12) doi: 10.1117/12.215515
Published in: Optical Engineering Volume 34, Issue 12
Show Author Affiliations
Claudio Oliveira Egalon, NASA Langley Research Ctr. (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)

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