Abstract

In slab waveguides, a mode reaches its cutoff point when the direction of the plane waves constituting the mode approach the critical angle for total internal reflection. Cutoff in round fibers is not related to the critical angle but has its origin in the radiation losses of curved dielectric waveguides. The cutoff condition of modes in slab waveguides and round fibers is discussed in this paper.

© 1973 Optical Society of America

Modal cutoff condition of an optical chiral fiber with different chiralities in the core and the cladding

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