We propose a unique design of negative curvature optical fibers utilizing rotational elliptical cladding structures. The silica-based fibers were numerically characterized using a finite element method-based electromagnetic solver. Different topologies consisting of rotational cladding elements with different tube thicknesses and core diameters were studied. The investigation focused on confinement losses, birefringence, and higher-order mode extinction based on varying tube sizes and rotational angles. Results showed up to 20% improvement in confinement losses for rotated structures, with minimum losses of 4.47*10-4 dB/m at 1.5 μm wavelength. The designed fibers possess polarization-dependent characteristics, and higher-order mode extinction analysis showed dominant single-mode transmission.
This study presents a systematic approach for designing and fabricating a new type of Terahertz optical fiber using 3D printing technology. Negative curvature optical fibers with multiple nested-tubes were designed using an FEM-based electromagnetic solver. The number of supported modes was found to increase significantly with utilization of more tubes. The fibers with tube thicknesses of 0.09 mm and core diameters of 3 mm and 8 mm were fabricated using a UV resin-based 3D printer. An imaging setup was built to confirm the geometrical properties. This study demonstrates the feasibility of using 3D printing to fabricate functional Terahertz optical fibers.
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