Dodecagonal photonic quasi-crystal fiber with high birefringence

A photonic quasi-crystal fiber (PQF) with high birefringence is proposed. A dodecagonal Stampfli quasi-periodic lattice of air holes constitutes the cladding of the PQF. The PQF maintains the properties of high birefringence and single-mode operation regime in a wide wavelength range from 1.2 to 2.0 mu m by optimizing the size of the air holes around the core of the PQF. A birefringence with 3.86 x 10(-2) can be obtained at 1.31 and 1.55 mu m optical telecommunication windows. The birefringence is of the order of 10(-2), which is two orders of magnitude larger than that of the conventional polarization-maintaining fibers and hardly affected by the incident wavelength. The proposed PQF also maintains a high nonlinear coefficient and low confinement loss. Our structure and simulation results are expected to provide a valuable reference and basic data to relative fabrication and experiments. (C) 2016 Optical Society of America.