Optical fiber parameters effect on light propagation in a coiled multimode fiber

Abstract

An experimental investigation behavior of speckle pattern of light at propagating in a coiled multimode optical fiber with a step refractive index. Discovered rotation of special pattern depended on the helical pitch, that is turn speckle patt ern change when changing the helical pitch. It is independent of the mode composition of the light p ropagating in the Optical fiber.