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

Photonics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 26 ◽  
Author(s):  
Shovasis Biswas ◽  
S. Islam ◽  
Md. Islam ◽  
Mohammad Mia ◽  
Summit Sayem ◽  
...  

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.

Author(s):  
Shovasis Kumar Biswas

The purpose of this paper is to design a hexagonal microstructure photonic crystal fiber (PCF) which gives ultra-high birefringence and very low confinement loss for sensing application. To characterize the modal properties of the proposed photonic crystal fiber, finite element method is used. We found ultra-high birefringence of 3.34×10-2 at operating wavelength 1550nm by using simulation software comsol multiphysics. Our proposed PCF gives large value of nonlinear coefficient of 63.51 W-1km-1, large value of negative dispersion coefficient of -566.6 ps/ (nm.km), and also ultra-low confinement loss which is in the order of 10-7.


2012 ◽  
Vol 566 ◽  
pp. 599-603
Author(s):  
Ding Jie Xu ◽  
Hong Ru Song ◽  
Wei Wang ◽  
Yue Fan

A novel type of hybrid-core photonic crystal fiber is proposed, whose core is composed of center-directionally decrescent air holes arrayed as pentagonal and an octagonal structure. Characteristics of the proposed PCF are analyzed theoretically by using all vector finite element method (V-FEM). Results show that high-birefringence and negative dispersion are obtained over the wavelength range from 0.8µm to 1.8µm, and the maximum of birefringence reaches 1.36×10-2 and negative dispersion achieves -600 ps•nm-1•km-1~-60 ps•nm-1•km-1, which will fulfill the requirement of high-birefringence polarization maintaining fiber fabricating and wideband dispersion compensating.


2021 ◽  
Vol 53 (12) ◽  
Author(s):  
Sanat Kumar Pandey ◽  
Jitendra Bahadur Maurya ◽  
Yogendra Kumar Prajapati

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