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http://dx.doi.org/10.3807/JOSK.2015.19.5.449

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

Kim, Soeun (Integrated Optics Laboratory, Advanced Photonics Research Institute, GIST)
Lee, Yong Soo (Integrated Optics Laboratory, Advanced Photonics Research Institute, GIST)
Lee, Chung Ghiu (Department of Electronic Engineering, Chosun University)
Jung, Yongmin (Optoelectronics Research Centre, University of Southampton)
Oh, Kyunghwan (Departmemt of Physics, Yonsei University)
Publication Information
Journal of the Optical Society of Korea / v.19, no.5, 2015 , pp. 449-455 More about this Journal
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;
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