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Band Characteristics of a Polarization Splitter with Circular Cores and Hollow Pits

Midori NAGASAKA, Taiki ARAKAWA, Yutaro MOCHIDA, Kazunori KAMEDA, Shinichi FURUKAWA

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Summary :

In this study, we discuss a structure that realizes a wideband polarization splitter comprising fiber 1 with a single core and fiber 2 with circular pits, which touch the top and bottom of a single core. The refractive index profile of the W type was adopted in the core of fiber 1 to realize the wideband. We compared the maximum bandwidth of BW-15 (bandwidth at an extinction ratio of -15dB) for the W type obtained in this study with those (our previous results) of BW-15 for the step and graded types with cores and pits at the same location; this comparison clarified that the maximum bandwidth of BW-15 for the W type is 5.22 and 4.96 times wider than those of step and graded types, respectively. Furthermore, the device length at the maximum bandwidth improved, becoming slightly shorter. The main results of the FPS in this study are all obtained by numerical analysis based on our proposed MM-DM (a method that combines the multipole method and the difference method for the inhomogeneous region). Our MM-DM is a quite reliable method for high accuracy analysis of the FPS composed of inhomogeneous circular regions.

Publication
IEICE TRANSACTIONS on Electronics Vol.E106-C No.4 pp.127-135
Publication Date
2023/04/01
Publicized
2022/10/17
Online ISSN
1745-1353
DOI
10.1587/transele.2022REP0003
Type of Manuscript
Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category

Authors

Midori NAGASAKA
  Nihon University
Taiki ARAKAWA
  Nihon University
Yutaro MOCHIDA
  Nihon University
Kazunori KAMEDA
  Sano Nihon University College
Shinichi FURUKAWA
  Nihon University

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