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We proposed atypical design of wideband photonic crystal fiber with optimized losses using a rectangular pcf with enlarged four central air hole. The proposed design of pcf is composed silica material, design and simulated by finite difference time domain software(FDTD)method, Using this structure, the pcf with confinement loss lass then −0.1db/km over a wide range of wavelength from 0.8–2μm and zero...