title: Filter of optical vortices: highly twisted high-birefringence optical fibers.
abstract: Modes and bandgap structure of highly twisted high-birefringence weakly guiding fibers are studied in the scalar approximation. It is shown that within the gap the system can serve as a filter of circular optical vortices.
authors.affiliation: Physical Department, Taurida National V. Vernandsky University, Vernadsky Avenue 4, Simferopol 95007, Crimea, Ukraine.
authors.forename: C N
authors.initials: CN
authors.lastname: Alexeyev
authors.forename: H G
authors.initials: HG
authors.lastname: Galamaga
authors.forename: A V
authors.initials: AV
authors.lastname: Volyar