Abstract
Propagation and mode coupling within relatively short () 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 and lengths of . Output beam quality and mode-coupling coefficients 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 length fiber of core and clad fiber is close to single mode (), while output from a core and clad fiber also has high beam quality.
© 2011 Optical Society of America
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