title: Structural design for birefringent holey fiber with a beat length insensitive to wavelength.
abstract: By combination of two defect structures with positive and negative birefringence, we design a holey fiber with a beat length that is less sensitive to wavelength. The influence of different structural parameters on birefringence of holey fiber is calculated by the finite-difference beam propagation method. A stable beat length can be achieved at some given wavelength window by adjusting the parameters. An almost uniform beat length with a greater than 180 nm bandwidth at 1310 and 1550 nm wavelength windows is obtained, which is useful for the design and fabrication of fiber-optic wave plates with a wide band.
authors.affiliation: Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, 149 Yanchang Road, Shanghai 200072, China.
authors.forename: Jian-Qiang
authors.initials: JQ
authors.lastname: Lin
authors.forename: Zhi-Dong
authors.initials: ZD
authors.lastname: Shi
authors.forename: Ming-Jia
authors.initials: MJ
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Chen