Fibre core profile characterization by measuring group velocity equalization wavelengths
- 1 April 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 3 (4) , 351-353
- https://doi.org/10.1109/68.82109
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
This publication has 6 references indexed in Scilit:
- Interféromètres modaux à symétrie circulate dans les fibres optiquesAnnals of Telecommunications, 1989
- Circularly symmetric modal interferometers: Equalization wavelength and equivalent step determination for matched-cladding fibersFiber and Integrated Optics, 1989
- Tapered-fiber interferometric wavelength response: the achromatic fringeOptics Letters, 1988
- Simple technique for measurement of equalisation wavelength in single-mode optical fibresElectronics Letters, 1987
- New approach for determining non-Gaussian mode fields of single-mode fibres from measurements in far fieldElectronics Letters, 1985
- Cutoff wavelength determination in single-mode optical fibres by measurement of equalisation wavelengthElectronics Letters, 1984