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

Tuomo Von Lerber, Markus W. Sigrist

Research output: Contribution to journalArticlepeer-review

116 Citations (Scopus)

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 × 10−4dB) is achieved. Preliminary measurements of evanescent-field absorption are also discussed.

Original languageEnglish
Pages (from-to)3567-3575
Number of pages9
JournalApplied Optics
Volume41
Issue number18
DOIs
Publication statusPublished - 20 Jun 2002
Externally publishedYes

Fingerprint

Dive into the research topics of 'Cavity-ring-down principle for fiber-optic resonators: Experimental realization of bending loss and evanescent-field sensing'. Together they form a unique fingerprint.

Cite this