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Proceedings Paper

Analysis of optical-power redistribution for hybrid optical fibers
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Paper Abstract

This paper brings a short view into the hybrid communication-sensing fiber analysis. Commonly used telecommunication fibers are designed to be independent of external conditions. The transmitted signal should not be influenced by the external conditions. On the other side there are optical fiber sensors which are used for detecting or measuring the external quantities. In our research we are trying to include both properties in one optical fiber. A special type of fiber (a hybrid fiber), which preserves character of the standard communication fiber, was designed and maintained for this purpose. We use a microscope with a high-resolution camera to watch the power redistribution between individual modes at the output end of the fiber. The coupled power equations are used to predict changes in the optical power redistribution after determination of the coupling coeffcients. The key problem is how to excite individual modes for determination of the coupling coeffcients because of a very small diameter of the fiber. The Fourier and wavelet analysis is used to find out the significant points in the progression of the optical power. There are changes in the Fourier spectra and changes in wavelet coeffcients. From the Fourier analysis we can predict the progression, wavelet analysis enables us to find out singularities. It is expected, that every change to the fiber has its own "fingerprint" in the redistribution of the optical power. So we believe that we will be able to say, what affects the fiber, if it is heat, pressure, tension etc.

Paper Details

Date Published: 12 October 2007
PDF: 8 pages
Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67701B (12 October 2007); doi: 10.1117/12.752587
Show Author Affiliations
J. Skapa, VSB-TU Technical Univ. of Ostrava (Czech Republic)
V. Vašinek, VSB-TU Technical Univ. of Ostrava (Czech Republic)
P. Šiška, VSB-TU Technical Univ. of Ostrava (Czech Republic)

Published in SPIE Proceedings Vol. 6770:
Fiber Optic Sensors and Applications V
Eric Udd, Editor(s)

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