2014•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access

Mode coupling in few-mode large-mode-area fibers

Changgeng Ye, Joona Koponen, Ville Aallos, Laëticia Petit, Ossi Kimmelma, Teemu Kokki

Abstract

We present an experimental study on mode coupling characteristics of few-mode large-mode-area (LMA) fibers, which are widely used in high power fiber lasers. The modal power allocation is measured by modal decomposition of the nearfield intensity profile of the output beam. Cut-back measurements are carried out with commonly-used fibers with different fiber geometries. The evolution of the modal power content due to mode coupling is presented. The influence of the fiber geometry on mode coupling is discussed.

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Key concepts: Equilibrium mode distribution, Mode (computer interface), Modal, Mode scrambler, Coupling (piping), Materials science, Mode volume, Mode coupling