Abstract
Optical fibre tapers have recently been intensively studied for a variety of applications, including telecommunications, medical, and biochemical sensing. In this research, we fabricate photonic crystal fiber taper without collapsing air holes and describe how steering air-cladding increases the evanescent-field sensitivity of microstructure fibres. The enhancement of the microstructure fibre's performance is based on the decrease of the diameter of the fiber core to a minimal width by tapering, where a specified part power of light is directed by an evanescent field passing through the air holes in the axial cladding. The initial structure of the fiber with outer diameter of 5 μm was reduced (100, 80,60) um for improving the very limited. The guided core mode and axial air holes have a high intensity overlap at 1.55 m wavelength.Some simulation results have been achieved by using the COMSOL multiphysics program. It used to design the photonic crystal fiber large-mode area and with different taper waist diameter and find mode intensity distributions guiding of 1550 nm inside the optical crystal fiber.
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