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Crystals 2019, 9(2), 58; https://doi.org/10.3390/cryst9020058

Polarization Converter Based on Square Lattice Photonic Crystal Fiber with Double-Hole Units

1
Department of Electrical, Electronics and Information Engineering, Kanagawa University, Yokohama 221-8686, Japan
2
Division of Information and Electronic Engineering, Muroran Institute of Technology, Muroran 050-8585, Japan
3
Department of Opt-Electronic System Engineering, Chitose Institute of Science and Technology, Chitose 066-8655, Japan
*
Author to whom correspondence should be addressed.
Current address: 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
Received: 17 December 2018 / Revised: 18 January 2019 / Accepted: 21 January 2019 / Published: 22 January 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
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Abstract

In this study, a novel polarization converter (PC) based on square lattice photonic crystal fiber (PCF) is proposed and analyzed. For each square unit in the cladding, two identical circular air holes are arranged symmetrically along the y = x axis. With the simple configuration structure, numerical simulations using the FDTD analysis demonstrate that the PC has a strong polarization conversion efficiency (PCE) of 99.4% with a device length of 53 μ m, and the extinction ratio is −21.8 dB. Considering the current PCF fabrication technology, the structural tolerances of circular hole size and hole position have been discussed in detail. Moreover, it is expected that over the 1.2∼1.7 μ m wavelength range, the PCE can be designed to be better than 99% and the corresponding extinction ratio is better than 20 dB . View Full-Text
Keywords: polarization converter; photonic crystal fiber; square lattice polarization converter; photonic crystal fiber; square lattice
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Zhang, Z.; Tsuji, Y.; Eguchi, M.; Chen, C.-P. Polarization Converter Based on Square Lattice Photonic Crystal Fiber with Double-Hole Units. Crystals 2019, 9, 58.

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