Open AccessMeasurement of effective refractive-index differences in a few-mode fiber by axial fiber stretching
Author(s) -
Juha-Matti Savolainen,
L. Grüner-Nielsen,
Poul Kristensen,
Péter Balling
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.018646
Subject(s) - mode volume , optics , graded index fiber , materials science , polarization maintaining optical fiber , fiber , refractive index , optical fiber , photonic crystal fiber , dispersion shifted fiber , normalized frequency (unit) , fiber optic sensor , physics , composite material , phase locked loop , frequency synthesizer , phase noise
A method for measuring the effective refractive-index differences in a few-mode fiber by applying axial fiber stretching is described. This method represents a straightforward technique for characterization of few-mode fibers. Interference between LP01 and LP11 and in some cases also between LP11 and LP21 are observed in a fiber designed for support of LP01 and LP11. The relative strength of the coupled modes depends on specific splicing characteristics, and in some cases only two modes are seen. The results agree well with theoretical predictions for the fiber under investigation.