Various types of 1.55-μm dispersion-shifted fiber have been presented. Among them, triangular core1 and similar fibers have the advantage in terms of optical loss. Recently, a triangular profile with a ring in the cladding was proposed to minimize the bending loss.2 Our paper now describes the effect of the ring on the transmission characteristics of triangular and Gaussian core fibers.3

© 1986 Optical Society of America

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