Supercontinuum Generation in a Highly Nonlinear Chalcogenide/ MgF2 Hybrid Photonic Crystal Fiber

Abstract

In this paper, we report the numerical analysis of a photonic crystal fiber (PCF) for generating an efficient supercontinuum medium. For our computational studies, the core of the proposed structure is made up of As2Se3 and the cladding structure consists of an inner ring of holes made up As2Se3 and four outer rings of air holes in MgF2. The proposed structure provides excellent nonlinear coefficient and dispersion optimization. For the analysis, finite difference frequency domain (FDFD) method is employed. Because of the high nonlinear refractive index of the chalcogenide glass and high difference between the refractive index of the core and the cladding, a small effective mode area of 0.68 μm 2 is obtained. The nonlinear coefficient is 14.98 W -1 m -1 at the wavelength of 1.8 μm. Dispersion is almost flat from 1.6 μm up to 2.8 μm.The supercontinuum spectrum calculated ranges from 1 μm to 6 μm. The presented structure is appropriate for medical imaging, optical coherence tomography and optical communications.

Structural Analysis of Nano Core PCF With Fused Cladding for Supercontinuum Generation in 6G Networks

“…The non‐linear coefficient is given by (M. S. Rao & V. Singh, 2018), $$$\gamma =\frac{2\pi {n}_{2}}{\lambda {A}_{\text{eff}}}$$$ where n 2 specifies non‐linear refractive index. Effective mode area can be calculated using (M. Seifouri, & M. R. Alizadeh, 2018), $$${A}_{\text{eff}}=\frac{{\left[\begin{array}{@{}c@{}}\infty \\ \int \\ -\infty \end{array}\begin{array}{c}\infty \\ \int \\ -\infty \end{array}{\vert E(x,y)\vert }^{2}dx\,dy\right]}^{2}}{\begin{array}{c}\infty \\ \int \\ -\infty \end{array}\begin{array}{c}\infty \\ \int \\ -\infty \end{array}{\vert E(x,y)\vert }^{4}dx\,dy}$$$ where E ( x , y ) refers to electric field mode distribution of fundamental fiber mode. Birefringence introduces a difference in refractive index (M. A. Gandhi, et al., 2017; M. Kalantari, et al., 2018).…”

Numerical Investigation and Design of Optical On-Chip Waveguide with Engineered Dispersion for Generation of Supercontinuum-Based Frequency Combs

“…Most recently, there is urgent need for compression and device miniaturization in optical circuits, which can be achieved by using the nonlinear effects of structures containing silicon (Li et al 2018), Hydex (Moss et al 2013 ), SiN (Tan et al 2018;Frigg et al 2019), AlN (Gong et al 2018), diamond (Amirhassan et al 1019), III-V semiconductor (Pu et al 2016;Hu et al 2018;Chang et al 2018), and chalcogenide (Karami et al 2017;Alizadeh and Seifouri 2017;Seifouri and Alizadeh 2018;Alizadeh and Seifouri 2019). Silicon-on-insulator (SOI) waveguide is considered as an important substrate in compact circuits due to its high nonlinear properties and compatibility with CMOS integrated circuits.…”