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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 18 — Jun. 20, 2002
  • pp: 3567–3575

Cavity-ring-down principle for fiber-optic resonators: experimental realization of bending loss and evanescent-field sensing

Tuomo von Lerber and Markus W. Sigrist  »View Author Affiliations


Applied Optics, Vol. 41, Issue 18, pp. 3567-3575 (2002)
http://dx.doi.org/10.1364/AO.41.003567


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Abstract

A novel measurement principle for fiber-optic sensing is presented. Use of a cavity-ring-down scheme enables measurements of minute optical losses in high-finesse fiber-optic cavities. The loss may be induced by evanescent-field absorption, fiber bending, fiber degradation, Bragg gratings, or any other effect that might change the fiber transmission or cavity reflector properties. The principle is proved to be rather insensitive to ambient perturbations such as temperature changes. A high-sensitivity measurement of loss due to bending is presented as a proof-of-principle. With a cavity finesse of 627 a sensitivity for induced loss of 108 ppm (4.68 × 10-4 dB) is achieved. Preliminary measurements of evanescent-field absorption are also discussed.

© 2002 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(230.5750) Optical devices : Resonators

History
Original Manuscript: September 5, 2001
Revised Manuscript: March 8, 2002
Published: June 20, 2002

Citation
Tuomo von Lerber and Markus W. Sigrist, "Cavity-ring-down principle for fiber-optic resonators: experimental realization of bending loss and evanescent-field sensing," Appl. Opt. 41, 3567-3575 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-18-3567

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