title: Ultrabroadband polarization splitter based on three-core photonic crystal fiber with a modulation core.
abstract: We design an ultrabroadband polarization splitter based on three-core photonic crystal fiber (PCF). A modulation core and two fluorine-doped cores are introduced to achieve an ultrawide bandwidth. The properties of three-core PCF are modeled by using the full-vector finite element method along with the full-vector beam propagation method. Numerical results demonstrate that an ultrabroadband splitter with 320 nm bandwidth with an extinction ratio as low as -20  dB can be achieved by using 52.8 mm long three-core PCF. This splitter also has high compatibility with standard single-mode fibers as the input and output ports due to low splicing loss of 0.02 dB. All the air holes in the proposed structure are circular holes and arranged in a triangular lattice that makes it easy to fabricate.
authors.forename: Tongtong
authors.initials: T
authors.lastname: Zhao
authors.forename: Shuqin
authors.initials: S
authors.lastname: Lou
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Min
authors.initials: M
authors.lastname: Zhou
authors.forename: Zhenggang
authors.initials: Z
authors.lastname: Lian