π/N Expansion to the LP01 Mode of a Step-Index N-Sided Regular-Polygonal-Core Fiber

Naofumi KITSUNEZAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.1   pp.3-10
Publication Date: 2020/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019REP0001
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
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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Summary: 
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.