title: Dual-core antiresonant hollow core fibers.
abstract: In this work, dual-core antiresonant hollow core fibers (AR-HCFs) are numerically demonstrated, based on our knowledge, for the first time. Two fiber structures are proposed. One is a composite of two single-core nested nodeless AR-HCFs, exhibiting low confinement loss and a circular mode profile in each core. The other has a relatively simple structure, with a whole elliptical outer jacket, presenting a uniform and wide transmission band. The modal couplings of the dual-core AR-HCFs rely on a unique mechanism that transfers power through the air. The core separation and the gap between the two cores influence the modal coupling strength. With proper designs, both of the dual-core fibers can have low phase birefringence and short modal coupling lengths of several centimeters.
authors.forename: Xuesong
authors.initials: X
authors.lastname: Liu
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Fan
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Shi
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Ma
authors.forename: Jin
authors.initials: J
authors.lastname: Yu
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang