Design of Silica-Based Birefringent Honeycomb Photonic Crystal Fiber With Squeezed Geometry and Germanium-Doped Core for all-Normal Dispersion Supercontinuum Generation

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We propose and numerically analyze a silica-based birefringent photonic crystal fiber (PCF) featuring a honeycomb lattice with a squeezed geometry and a germanium doped core. The structure is designed to exhibit all-normal dispersion (ANDi) up to 2.3 μ m with maximum of dispersion located around 1.55 μ m. The honeycomb arrangement, combined with controlled lattice anisotropy and auxiliary sub-wavelength air holes, allows precise tailoring of dispersion and polarization properties. The addition of a germanium-doped core region enhances the refractive index contrast and supports a compact mode area favorable for efficient nonlinear interactions. Additionally, we analyze the influence of the design parameters on the chromatic dispersion and on the generated supercontinua characteristics.