Abstract
Whispering gallery modes (WGM) in a cylindrical micro-cavity of a silica optical fiber are excited with a tapered fiber of ~7μm in diameter by evanescence field, and the WGM spectra of the cylindrical micro-cavity with different diameters (300μm, 400μm and 500μm) are measured. The resonant positions and their separations of the spectra are assigned precisely by an asymptotic formula. Considering the fiber dispersion and the errors induced from it, the values of the resonant position and its separation achieved from assignment within the experimental spectra range (1290~1320 nm) match well with a theoretical calculation and a measured accuracy of the refractive index of the micro-cavity can be as high as 10<sup>-5</sup>, which indicates that a dispersion sensor can be formed by measuring the dispersive features of WGM in a cylindrical micro-cavity.
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