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Proceedings Paper

LMA fibers modal decomposition using image factor analysis
Author(s): Jean-Joseph Max; Bertrand Gauvreau; Benoit Sévigny; Mathieu Faucher
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Paper Abstract

A new method is presented for the analysis of the modal content of a beam travelling in a waveguide. This method uses a simple optical set up to record beam images. Depending on the application, the source can be broad band (BBS) or a tunable laser. The method uses the eigenmode profiles of the waveguide under test, either theoretical or experimental ones. In this case, the technique is applied to characterize the modal content of few moded large mode area (LMA) fibers. Such LMA fibers are typically used in high power fiber lasers and amplifiers to reduce sensitivity to non-linear effects. By calculating the scalar products of the unfolded experimental and theoretical 2D profiles, the modal content is obtained. Access to such cost effective and easy to implement diagnosis tool will greatly help improving modal quality preservation in components and systems based on the fundamental mode operation of few moded LMA fibers. The high precision and performance of the method is evaluated using both computer generated and experimental data sets.

Paper Details

Date Published: 11 February 2011
PDF: 8 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142M (11 February 2011); doi: 10.1117/12.875168
Show Author Affiliations
Jean-Joseph Max, ITF Labs./Avensys Tech (Canada)
Bertrand Gauvreau, ITF Labs./Avensys Tech (Canada)
Benoit Sévigny, ITF Labs./Avensys Tech (Canada)
Mathieu Faucher, ITF Labs./Avensys Tech (Canada)


Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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