Influence of fiber bending and strain on the modal content

Christian Schulze; Daniel Flamm; Michael Duparré; Siegmund Schröter

doi:10.1117/12.906352

15 February 2012 Influence of fiber bending and strain on the modal content

Christian Schulze, Daniel Flamm, Michael Duparré, Siegmund Schröter

Proceedings Volume 8237, Fiber Lasers IX: Technology, Systems, and Applications; 823711 (2012) https://doi.org/10.1117/12.906352
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

Today multimode optical fibers are used to transport and generate high brilliant beams of considerable power. External perturbation of the fiber, e.g., induced by bending or strain, will influence the guided light, i.e., change modal content and beam properties. We present a detailed experimental investigation of fiber bending and strain induced changes of the modal content, based on the Correlation Filter Method that performs a modal decomposition with computer-generated holograms. Using this technique the modal amplitudes and phases can be monitored in real-time, i.e., currently with up to 30 Hz, such that variations in the modal composition can be observed instantaneously. The fast measurement rate can be used for adjustment purposes, e.g., to evaluate quantitatively the change of beam quality with varying bending diameter. We have applied our method to different kinds of multimode fibers such as step-index, photonic crystal and multicore fibers, whereas the results for a step-index and a multicore large mode area fiber are exemplarily presented, including the impact of bending on the beam quality.

Citation Download Citation

Christian Schulze, Daniel Flamm, Michael Duparré, and Siegmund Schröter "Influence of fiber bending and strain on the modal content", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823711 (15 February 2012); https://doi.org/10.1117/12.906352

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