Tunneling leaky modes in a parabolic index fiber.

Single or close to single tunneling leaky modes have been prism coupled into nominally parabolic index SEL-FOC fibers with effective efficiencies on the order of 10%. The mode parameters fit fairly well to an analytical continuation of the solutions to Gloge and Marcatili's equations for parabolic index fibers. The data can also be used in conjunction with the Gloge and Marcatili equations to obtain information about the index profile.