الملخص

Abstract Three proposals of large pitch (Λ=5µm) photonic crystal fibers (PCFs) are studied. The effect of air hole radius on the properties of the fundamental mode of these fibers are considered. All the parameters of the proposed structured were kept constant except the hole radius were varied 0.5, 0.8, and 1.0μm for the PCF1, PCF2 and PCF3 respectively. Numerical aperture, effective area, nonlinear coefficient, dispersion, flattened dispersion, dispersion slope and zero dispersion wavelength of the PCFs were all investigated. This study shows that the dispersion profile was affected by the radius of the hole and PCF3 showed more flattened dispersion (dispersion slope of 0.015333ps/nm2.km), in range of 1.2~1.5μm of wavelength compared to PCF1 and PCF2 structures. On other hand, the increase of air hole radius increased the numerical aperture and decreased the effective area along the full range of wavelength, while zero dispersion point was shifted towards the shorter wavelength. The calculated results were compared with other published work of small pitch (Λ=2.3µm) photonic crystal fiber.