Abstract
Single-mode excitation of step-index multimode fibers with light sources with short temporal coherence lengths is demonstrated. Multimode fiber designs with reduced microbending-induced mode coupling are described that allow the propagation of the fundamental mode over long lengths with negligible mode coupling even in the presence of tight fiber bends. At a wavelength of a fiber with a core diameter of can preserve the fundamental mode for a propagation length of . Such fibers allow coiling with a coil diameter as small as 7 cm.
© 1998 Optical Society of America
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