Abstract
This paper presents a quasi-ray physical model that takes into account the
curvature of the reflecting surface of the core when a ray propagates in a fiber
lightguide. It is shown to be possible to use such an approach to estimate the intensity
distribution of radiation coming out of a short lightguide. The effect in which spiral
distributions appear is explained. It is experimentally confirmed that oblique rays in
fibers predominantly create optical vortices with a single direction of wave-front
rotation.
© 2008 Optical Society of America
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