Research on The Terahertz Fiber with Negative Curvature

In this paper, three terahertz fibers based on negative curvature claddings are designed, in which the negative curvature terahertz fiber with nested triangular claddings has a minimum confinement loss of 0.005 dB/cm at 2.36 THz, and the double negative curvature terahertz fiber has a low confinement loss of 4.7 ×10
^-4
dB/cm at 1.28 THz. The multimode orbital angular momentum (OAM) terahertz fiber based on double-layer elliptical cladding structure can reach the confinement loss of 10
^-15
dB/cm in the frequency range of 0.525 - 0.8 THz, which is beneficial to promote the application of mode division multiplexing (MDM) technology in communication systems.