LMA fibers modal decomposition using image factor analysis

Jean-Joseph Max; Bertrand Gauvreau; Benoit Sévigny; Mathieu Faucher

doi:10.1117/12.875168

10 February 2011 LMA fibers modal decomposition using image factor analysis

Jean-Joseph Max, Bertrand Gauvreau, Benoit Sévigny, Mathieu Faucher

Proceedings Volume 7914, Fiber Lasers VIII: Technology, Systems, and Applications; 79142M (2011) https://doi.org/10.1117/12.875168
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Jean-Joseph Max, Bertrand Gauvreau, Benoit Sévigny, and Mathieu Faucher "LMA fibers modal decomposition using image factor analysis", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142M (10 February 2011); https://doi.org/10.1117/12.875168

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