Confinement loss and nonlinearity analysis of air-guiding modified honeycomb photonic bandgap fibers

Air-guiding photonic bandgap fibers based on a modified honeycomb lattice have been numerically investigated through the finite element method. Results confirm that an extra hole in the unit cell of a honeycomb lattice can be exploited to enlarge the photonic bandgap, allowing air-guiding with confinement losses lower than 0.1 dB/km and nonlinear coefficient lower than 3.5middot10-3(Wmiddotkm)-1at 1.55 mum