Radiation characteristics of multimode fibers with enlarged tapers were investigated on a number of samples obtained by varying the fiber drawing speed with a given law corresponding to a prefixed taper profile. The characterization of the fibers was made by near- and far-field intensity pattern measurements as well as by measuring the losses introduced by the taper. With a suitable choice of parameters the taper constitutes a reasonable low-loss component useful, for example, for either efficient coupling to large-spot high-power density sources or connecting fibers of different sizes. Conversely at the exit of the fiber the taper can be used for beam shaping which is of interest for mechanical or surgical applications.
© 1982 Optical Society of America
Original Manuscript: July 28, 1981
Published: January 15, 1982
M. Brenci, R. Falciai, and A. M. Scheggi, "Tapered enlarged ends in multimode optical fibers," Appl. Opt. 21, 317-319 (1982)