Tellurite based circular photonic crystal fiber with high nonlinearity and low confinement loss

Abstract

Photonic Crystal Fibers (PCFs) generate great interest in the field of optical fiber technology because of its ability to tailor different optical characteristics such as birefringence, dispersion, mode area, nonlinearity etc. High index non silica based glass fibers have high nonlinearity and low loss in mid-infrared wavelength transmission. Out of this, tellurite glass is a highly suitable fiber material for infrared nonlinear applications because of its high nonlinear coefficient compared to other non-silica glasses. Typically in Photonic Crystal Fibers, air holes are arranged in hexagonal or octagonal structure.In the present investigation, a circular lattice PCF is designed with tellurite core and various optical properties such as confinement loss, effective mode area, dispersion and nonlinear coefficient are analyzed using COMSOL MultiPhysics. The proposed fiber gives very high nonlinearity with a maximum of 12,100W−1km−1 at 0.45μm, ultra high negative dispersion and very low confinement loss for a wide range of wavelengths. High nonlinearity is suitable for super continuum generation. This fiber can also be used as a dispersion compensation fiber.