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π/N Expansion to the LP01 Mode of a Step-Index N-Sided Regular-Polygonal-Core Fiber
IEICE TRANSACTIONS on Electronics
Publication Date: 2020/01/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
step-index N-sided regular-polygonal-core fiber, N-fold rotational symmetry, parity symmetry, non-anomalous approximation of π/N expansion,
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Herein, we analytically derive the effective index and field distribution of the LP01 mode of a step-index N-sided regular-polygonal-core fiber. To do this, we utilize the lowest-order non-anomalous approximation of the π/N expansion. These properties are also calculated numerically and the results are compared the with approximations.