Abstract
In this paper the photonic crystal fiber (PCF) with square-lattice array in a silica matrix has been put forward. The PCFs studied in this paper have a solid core, obtained by introducing a defect that is by removing two holes at the center of the fiber cross section and with smaller air-holes in the same direction. For the different wavelengths in the range between 700 <i>nm</i> and 1600 <i>nm</i>, the effective index <i>n<sub>eff</sub></i> of the PCF fundamental mode has been obtained by the fast multipole method. The model field, birefringence, and confinement loss of the fibre fundamental mode are simulated. It is found that lower confinement loss and higher birefringence can be realized in the condition of fewer rings of air holes. The simulation results in this paper are important for instructing the fabrication of birefringent photonic crystal fibers.
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