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Tapered single-mode optical fiber evanescent coupling

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2 Author(s)
A. J. Fielding ; Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD, USA ; C. C. Davis

We describe the results of a numerical and experimental investigation of how a point source of radiation couples light to the HE/sub 11/ mode of a tapered single-mode fiber. Specifically, we have investigated two different geometries of nonadiabatic, tapered single-mode optical fiber. The motivation for this study is the characterization of a single-mode tapered optical fiber biosensor. In such a device light is collected from fluorescent sources located along the cladding surface of the tapered fiber. Taper-to-taper coupling measurements and fiber mode calculations indicate the device sensitivity decreases exponentially as sources are moved away from the tip of the tapered fiber.

Published in:

IEEE Photonics Technology Letters  (Volume:14 ,  Issue: 1 )