Grade-2 Teflon (AF1601) PCF for optical communication using 2D FDTD technique: a simplest design

Abstract

A nonlinear ytterbium-doped rectangular proposed PCF structure of inner and outer cladding is used to analyze effective mode field area (A_eff), nonlinear coefficient (γ), dispersion (D), and confinement loss (CL) in a wide range of wavelength. The fabrication of PCF structure is due to different size doped air hole, pitch, and air hole diameter in a regular periodic geometrical array fashion. The various property of PCF structure such as mode field area, nonlinear coefficient, dispersion, and confinement loss are analyzed by implementing 2D FDTD technique. The above PCF property investigated using suitable parameters like Λ₁, $\frac{d_1}{{\mathrm{\Lambda }}_1}$, $\frac{{\mathrm{\Lambda }}_2}{{\mathrm{\Lambda }}_1}$, and $\frac{d_2}{d_1}$ in three different situations is discussed in simulation. The high nonlinear coefficient and dispersion property of PCF structure are tailored by setting the cladding parameter. However, highly nonlinear fibers with nonzero dispersion at the wavelength of 1.55 μm are very attractive for a range of optical communication application such as laser amplifier, pulse compression, wavelength conversion, all optical switching, and supercontinuum generation. So our newly proposed ytterbium-doped PCF seems to be most suitable exclusively for supercontinuum generation and nonlinear fiber optics. Finally, it is observed that ytterbium-doped Teflon (AF1601) PCF has more nonlinear coefficient (γ(λ) = 65.27 W⁻¹ km⁻¹) as compared to pure silica PCF (γ(λ) = 52 W⁻¹ km⁻¹) design to have same mode field area (A_eff) 1.7 μm² at an operating wavelength of 1.55 μm.

Keywords:

• photonic crystal fiber
• Kerr nonlinearity
• nonlinear coefficient

Disclosure statement

No potential conflict of interest was reported by the authors.