Design of an Ultrahigh Birefringence Photonic Crystal Fiber with Large Nonlinearity Using All Circular Air Holes for a Fiber-Optic Transmission System (original) (raw)
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Numerical analysis of photonic crystal fiber of ultra-high birefringence and high nonlinearity
Scientific Reports, 2020
A numerical analysis of a hexagonal PCF structure with four circular air hole rings around the core has been presented in this paper. By utilizing a full vectorial finite element method with perfectly matched layers, propagation properties such as birefringence, chromatic dispersion and confinement losses are numericaly evaluated for the proposed PCF structure. Specifically, birefringence of 2.018 × 10–2, nonlinear coefficients of 40.682 W−1 km−1, negative chromatic dispersion of − 47.72 ps/km.nm at 1.55 µm and − 21 to − 105 ps/km.nm at the telecommunication band of C-U have been reported.
Photonics, 2019
In this paper, we propose a modified design of a hexagonal circular photonic crystal fiber (HC-PCF) which obtains a large negative dispersion and ultrahigh birefringence simultaneously. The optical properties of the proposed HC-PCF were investigated using the finite element method (FEM) incorporated with a circular perfectly matched layer at the boundary. The simulation results showed large negative dispersion of −1044 ps/nm.km and ultrahigh birefringence of 4.321 × 10−2 at the operating wavelength of 1550 nm for the optimum geometrical parameters. Our proposed HC-PCF exhibited the desirable optical properties without non-circular air holes in the core and cladding region which facilitates the fabrication process. The large negative dispersion of the proposed microstructure over the wide spectral range, i.e., 1350 nm to 1600 nm, and high birefringence make it a suitable candidate for high-speed optical broadband communication and different sensing applications.
Numerical analysis of photonic crystal fibre with high birefringence and high nonlinearity
Journal of Optical Communications
A four-ring microstructure photonic crystal fibre with a descending air hole ring cladding is presented. Numerical analysis of the structure is done using full vectorial finite element method with perfectly matched layer (PML) boundary condition. It is demonstrated that it is possible to achieve at 1.55 µm confinement loss of 2.767 × 10−5 dB/m, birefringence of 0.00346 and a nonlinear co-efficient of 41.77 km−1 W−1. Also, chromatic dispersion realised suggests a tuneable zero dispersion at 0.9–1.1 µm wavelength range.
International Journal of Engineering Science Technologies, 2019
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.
This paper presents a hexagonal microstructure photonic crystal fiber (PCF) which provides ultra-high birefringence property with ultra low confinement loss and large nonlinearity for sensing application. Finite element method is used as a numerical simulation tool to characterize the properties of the proposed PCF. Based on our result, we found ultra high birefringence of 2.957×10-2 at operating wavelength of 1550nm from the numerical simulation. The proposed PCF also offers large value of negative dispersion coefficient of -517.6 ps/(nm.km). It also offers large value of nonlinear coefficient of 70.73 W-1km-1 and ultra low confinement loss in order of 10-6at excitation wavelength 1550nm. These reported results can be widely used for the broadband dispersion compensation in high-bit-rate transmission networks and sensing.
Optimum Design of Photonic Crystal Fiber and its Propagation Properties
In this paper we have shown a comparison of two proposed hexagonal geometries of Photonic Crystal Fiber (PCF). These geometries are different with respect to the area of circular air holes. The area of circular air holes of the structure proposed in Fig. 1(a) is kept fixed. The area of circular air holes is kept increasing with increase in number of rings for another structure. Both structure considered consists of seven rings. At a wavelength of 0.85m one of the PCF structure with increasing area of circular air hole report the most negative dispersion and before that almost zero dispersion. The birefringence of PCF structure with equal area of circular air hole is high compare to that of other proposed PCF structure. The confinement Loss reported is of the order of 5 10 for the PCF structure with equal area of circular air holes. The confinement factor was reported to be uniform for all the structures in this paper. The mode field pattern for both the structures appears to be a flower like shape with entire field being concentrated in the core and without leakage to cladding. The far field pattern (FFP) is also observed for both the structures.