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Optics Letters

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  • Vol. 26, Iss. 23 — Dec. 1, 2001
  • pp: 1867–1869

Measurement of fiber-cladding diameter uniformity by use of whispering-gallery modes: nanometer resolution in diameter variations along millimeter to centimeter lengths

Andrew W. Poon, Richard K. Chang, and Dipak Q. Chowdhury  »View Author Affiliations


Optics Letters, Vol. 26, Issue 23, pp. 1867-1869 (2001)
http://dx.doi.org/10.1364/OL.26.001867


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Abstract

Variations in fiber-cladding diameter on a nanometer scale were measured along millimeter to centimeter lengths by use of whispering-gallery modes (WGMs) in the elastic scattering of the fiber. The fiber was side coupled with a wavelength-tunable Gaussian beam. The scattered light was imaged ≈1:1 onto a multichannel photodiode array detector. Based on the WGM wavelength shifts along the fiber, the taper of the fiber cladding's diameter was measured on a nanometer/millimeter scale. The fiber's surface roughness amplitude (in nanometers) and granular size (≈100 µm) along centimeter-length fibers could also be revealed by use of higher- Q resonances.

© 2001 Optical Society of America

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements

Citation
Andrew W. Poon, Richard K. Chang, and Dipak Q. Chowdhury, "Measurement of fiber-cladding diameter uniformity by use of whispering-gallery modes: nanometer resolution in diameter variations along millimeter to centimeter lengths," Opt. Lett. 26, 1867-1869 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-23-1867


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References

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