Abstract

Propagation and mode coupling within relatively short (110m) large core, nominally multimode, fibers are of interest in a number of applications. In this research, we have studied the output beam quality and mode coupling in various fibers with core diameters of 100400μm and lengths of 2m. Output beam quality (M2) and mode-coupling coefficients (D) have been studied for different clad dimensions, numerical apertures, and wavelengths. The mode-coupling coefficients have been determined based on modal power diffusion considerations. The results show that D scales approximately as the inverse square of the clad dimension and inverse square root of the wavelength. Output from a 2m length fiber of 100μm core and 660μm clad fiber is close to single mode (M2=1.6), while output from a 200μm core and 745μm clad fiber also has high beam quality.

© 2011 Optical Society of America

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