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Photonics 2018, 5(3), 26; https://doi.org/10.3390/photonics5030026

Design of an Ultrahigh Birefringence Photonic Crystal Fiber with Large Nonlinearity Using All Circular Air Holes for a Fiber-Optic Transmission System

1
Department of Electrical and Electronic Engineering, Independent University Bangladesh, Dhaka 1229, Bangladesh
2
Department of Electronics & Communication Engineering, Sylhet International University, Sylhet 3100, Bangladesh
*
Author to whom correspondence should be addressed.
Received: 11 August 2018 / Revised: 28 August 2018 / Accepted: 29 August 2018 / Published: 5 September 2018
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Abstract

This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air holes in order to simultaneously achieve ultrahigh birefringence and high nonlinearity. The H-PCF design consists of an asymmetric core region, where one air hole is a reduced diameter and the air hole in its opposite vertex is omitted. The light-guiding properties of the proposed H-PCF structure were studied using the full-vector finite element method (FEM) with a circular perfectly matched layer (PML). The simulation results showed that the proposed H-PCF exhibits an ultrahigh birefringence of 3.87 × 10−2, a negative dispersion coefficient of −753.2 ps/(nm km), and a nonlinear coefficient of 96.51 W−1 km−1 at an excitation wavelength of 1550 nm. The major advantage of our H-PCF design is that it provides these desirable modal properties without using any non-circular air holes in the core and cladding region, thus making the fiber fabrication process much easier. The ultrahigh birefringence, large negative dispersion, and high nonlinearity of our designed H-PCF make it a very suitable candidate for optical backpropagation applications, which is a scheme for the simultaneous dispersion and nonlinearity compensation of optical-fiber transmission links. View Full-Text
Keywords: photonic crystal fiber; dispersion compensating fiber; birefringence; nonlinearity photonic crystal fiber; dispersion compensating fiber; birefringence; nonlinearity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Biswas, S.K.; Islam, S.M.R.; Islam, M.R.; Mia, M.M.A.; Sayem, S.; Ahmed, F. Design of an Ultrahigh Birefringence Photonic Crystal Fiber with Large Nonlinearity Using All Circular Air Holes for a Fiber-Optic Transmission System. Photonics 2018, 5, 26.

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