Fibre core profile characterization by measuring group velocity equalization wavelengths

Author

Archambault, J.-L. ; Black, R.J. ; Bures, J. ; Gonthier, F. ; Lacroix, S. ; Saravanos, C.

Author_Institution

Dept. de Genie Phys., Ecole Polytech., Montreal, Que., Canada

Volume

3

Issue

4

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

351

Lastpage

353

Abstract

When operated at shorter wavelengths, fibers that are single mode at telecommunications wavelengths of 1.3 and 1.55 mu m become few mode. Relative values of the group velocity equalization wavelengths for the different mode pairs existing down to visible wavelengths are quite sensitive to the refractive-index profile. Their measurement by few-mode interferometry provides simple, fast, and accurate characterization of fiber core refractive-index profile parameters: numerical aperture, core radius, central dip, and dopant diffusion. The method is attractive as a complement or alternative to standard refracted-near-field and preform measurements.<>

Keywords

light interferometry; optical fibres; optical testing; refractive index measurement; central dip; core radius; dopant diffusion; few-mode interferometry; fiber core refractive-index profile parameters; fibre core profile characterisation; fibre modes; group velocity equalization wavelengths; group velocity measurement; mode pairs; numerical aperture; refractometry; short fibre wavelength operation; visible wavelengths; Calibration; Interferometry; Measurement standards; Optical fiber cables; Optical fiber polarization; Optical fiber testing; Preforms; Process control; Velocity measurement; Wavelength measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.82109

Filename

82109