Abstract
In order to confine mode field energy effectively and obtain high birefringence, a new type of photonic crystal fiber (PCF) is proposed, which consists of air cores arrayed with pentagonal core and hexagonal cladding. Investigations show that high birefringence can be obtained by changing the aperture of the two symmetry holes outside the core. Simulation results show that the birefringence of this PCF reaches the magnitude of 10−3 which fulfills the requirements of high precision applications in optical systems. In addition, nonlinear coefficient reaches the magnitude of 103km−1w−1 after optimization, which will find application in nonlinear optics.
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