Ultra-flattened chromatic dispersion and highly nonlinear photonic crystal fibers with ultralow confinement loss employing hybrid cladding

Abstract

In this paper, two new types of dispersion-flattened photonic crystal fibers (DF-PCFs) with highly nonlinear and ultralow confinement loss are proposed. These new PCF structures adopt hybrid cladding with different air-holes diameters, pitches and air-holes arranged fashions. In order to analyze the proposed PCFs, the full-vector finite element method with anisotropic perfectly matched layers has been used. Results show that the ultra-flattened dispersion of 0.931ps/(nmkm) (DF-PCF1) and 1.533ps/(nmkm) (DF-PCF2) can be achieved in the wavelength range from 1.3 to 1.6μm with confinement losses lower than 0.001dB/km in the same wavelength range. Meanwhile, the nonlinear coefficients of our proposed PCFs are greater than 23.83W−1km−1 (DF-PCF1) and 29.65W−1km−1 (DF-PCF2) at the wavelength of 1.55μm, and two near-zero dispersion values of 0.328ps/(nmkm) (DF-PCF1) and −0.015ps/(nmkm) (DF-PCF2) can also be obtained at the same wavelength. Furthermore, the influence of manufacturing imperfections of parameters on dispersion and nonlinearity is discussed to verify the robustness of our design.