Design of a highly nonlinear twin bow-tie polymer photonic quasi-crystal fiber with high birefringence

摘要: Abstract A twin bow-tie polymer-based photonic quasi-crystal fiber with high birefringence, nonlinearity and low dispersion as well maintaining single mode operation is presented in the wavelength range 1.8–2.2 μm. Through optimizing structure parameter using a full-vector finite-element method combined perfectly matched layers boundary condition, birefringence 2.43 × 10 −3 , 118 W −1  km only 25 ps/nm/km at 2 μm holes pitch of 3.3 μm. From point fabrication, influences deviation each air hole diameter are discussed to verify robustness designed.