Design and analysis of the optical properties of modified 10-fold photonic quasi crystal fiber

In this paper، we have investigated the Penrose tiling photonic quasi crystal fiber with 10-fold symmetry. Due to low birefringence of this fiber، we have proposed two different asymmetric structure so as so obtain high birefringence and low beat length. By modifying radius of the air holes near core and changing the shape of air holes in cladding (from circle to elliptic)، these new structures have been introduced. As a consequence، we have obtained a high birefringence of 710-3، confinement loss 102 dB/Km and a beat length of less than 210-3 mm.