Abstract
A way to determine the boundaries of transitions zones in planar W-optical fibers is introduced, and the results of numerical calculations are presented. It is shown that the sizes of the considered transition zones at the cutoff frequencies of the main, first odd and second even modes significantly depend on the geometric and optical parameters of the W - fibers. These circumstances are important to consider in the selection of the parameters W-fibers in order to ensure that they have a stable single- mode or multimode operating condition, the necessary field concentration and effective filtering of the leaking modes.
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