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Article

Research Paper

Journal of the Optical Society of Korea 2015; 19(5): 449-455

Published online October 25, 2015 https://doi.org/10.3807/JOSK.2015.19.5.449

Copyright © Optical Society of Korea.

Hybrid Square-Lattice Photonic Crystal Fiber with Broadband Single-Mode Operation, High Birefringence, and Normal Dispersion

Soeun Kim1, Yong Soo Lee1, Chung Ghiu Lee2, Yongmin Jung3, and Kyunghwan Oh4

1Integrated Optics Laboratory, Advanced Photonics Research Institute, GIST; 2Department of Electronic Engineering, Chosun University; 3Optoelectronics Research Centre, University of Southampton; 4Departmemt of Physics, Yonsei University

Received: July 3, 2015; Revised: August 19, 2015; Accepted: September 8, 2015

Abstract

In this study we propose a new photonic crystal fiber (PCF) design that simultaneously offers broadband single-mode operation, high birefringence, and large normal dispersion in the optical-communication wavelength regime. The waveguide is based on a hybrid square-lattice PCF (HS-PCF) that has circular air holes of two different diameters alternating in the cladding, plus a pure silica defect at the center. The optical properties of the guided modes are analyzed numerically by the finite-element method (FEM) with a perfectly matched layer as the boundary condition. The optimized HS-PCF has a dispersion coefficient of $-601.67\;ps\;nm^{-1}\;km^{-1}$ and a high birefringence of $1.025{\times}10^{-2}$ at $1.55{\mu}m$. In addition, over the S+C+L+U wavelength bands the proposed HS-PCF with ultraflat birefringence with a slope on the order of $10^{-5}$.

Keywords: Photonic crystal fiber, High birefringence, Normal dispersion,

OCIS codes: 060.2270; 060.2280; 060.5295