低损耗蜂巢结构高双折射太赫兹光纤的设计

highly birefringent polymer terahertz (THz) fiber was proposed in this paper, which was formed with honeycomb cladding and some elliptical air holes in the fiber core. The losses and mode birefringence of the fiber is investigated by finite-different time-domain method. The results show that fiber can achieve both high birefringence and low confinement loss in a wide THz frequency range. Moreover, compared with a round solid-core fiber, guiding loss of the THz fiber caused by polymer material absorption can be reduced effectively as a part of the mode power is trapped in the air holes.