Bending-induced loss in dual-mode rectangular waveguides.
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 (LP(11)) mode is more lossy in case (i) than in case (ii), while the reverse is true for the first (LP(01)) mode. Further, in case (i) the LP(11)-mode loss is larger than the LP(01)-mode loss, but in case (ii) the LP(01)-mode loss is, surprisingly, larger than the LP(11)-mode loss. LP(11)-mode loss is consistent with the recent experimental results. This study should be useful in designing efficient elliptical-core fiber components such as LP(11)-mode strippers based on differential mode loss of the first two modes.
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Kumar
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Gallawa