Abstract

We examine how the bending-induced mode losses in a dual-mode rectangular-core waveguide vary with bend orientation. Bending about the minor axis [case (i)] and bending about the major axis [case (ii)] are considered. The second (LP11) mode is more lossy in case (i) than in case (ii), while the reverse is true for the first (LP01) mode. Further, in case (i) the LP11-mode loss is larger than the LP01-mode loss, but in case (ii) the LP01-mode loss is, surprisingly, larger than the LP11-mode loss. LP11-mode loss is consistent with the recent experimental results. This study should be useful in designing efficient elliptical-core fiber components such as LP11-mode strippers based on differential mode loss of the first two modes.

© 1994 Optical Society of America

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