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Proceedings Paper

Intermodal interference in few-mode optical fibers: new experiment and theory
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Paper Abstract

Spectral domain characteristics and parameters of optical fibers such as losses and their wavelength dependence, cutoff wavelengths for different fiber modes, wavelength dependencies of both the beat length and intermodal dispersion, etc., are important from the point of view of the development of new types of optical fibers. More recently, a new spectral domain white light interferometric technique employing a low resolution spectrometer has been used in measurement of the intermodal dispersion in optical fibers. The technique utilizes the fact that the spectral interference fringes are resolved at the output of a tandem configuration of the compensated (non-dispersive) Michelson interferometer and a few-mode optical fiber only in the vicinities of the so called equalization wavelengths at which the optical path difference (OPD) in the interferometer is the same as the intermodal group OPDs. Thus in the case of a two mode optical fiber the OPD adjusted in the interferometer and measured as a function of the equalization wavelength gives directly the spectral dependence of the intermodal group OPD in the optical fiber. The aim of this work is to use the new spectral domain white light interferometric technique to measure the intermodal dispersion in three different optical fibers. The aim of the work is also to perform an adequate theoretical analysis using a model of a weakly guiding, step-index optical fiber and to compare the corresponding results with the measured intermodal dispersion.

Paper Details

Date Published: 21 November 2003
PDF: 8 pages
Proc. SPIE 5259, 13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics, (21 November 2003); doi: 10.1117/12.545172
Show Author Affiliations
Petr Hlubina, Silesian Univ. Opava (Czech Republic)
Tadeusz Martynkien, Wroclaw Univ. of Technology (Poland)
Waclaw Urbanczyk, Wroclaw Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 5259:
13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics
Jerzy Nowak; Marek Zajac; Jan Masajada, Editor(s)

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