Fibre core profile characterization by measuring group velocity equalization wavelengths

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 refrac...

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Bibliographic Details
Published in:IEEE photonics technology letters 1991-04, Vol.3 (4), p.351-353
Main Authors: Archambault, J.L., Black, R.J., Bures, J., Gonthier, F., Lacroix, S., Saravanos, C.
Format: Article
Language:English
Subjects:
Calibration
Interferometry
Measurement standards
Optical fiber cables
Optical fiber polarization
Optical fiber testing
Preforms
Process control
Velocity measurement
Wavelength measurement
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Summary: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.< >
ISSN:1041-1135
1941-0174
DOI:10.1109/68.82109