title: Birefringence in microstructure fiber with elliptical GeO2 highly doped inclusion in the core.
abstract: We studied both numerically and experimentally a birefringence in a microstructure fiber with elliptical inclusion highly doped with GeO(2). We demonstrate that such inclusion increases the phase modal birefringence and modifies its dispersion in the short wavelength range, thus causing that group birefringence crosses zero value at a certain wavelength. Moreover, we numerically analyzed different factors contributing to the overall fiber birefringence, including geometrical birefringence induced by holes distribution and ellipticity of the inclusion as well as stress birefringence associated with thermal shrinkage of the doped glass.
authors.affiliation: Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Martynkien
authors.forename: Marcin
authors.initials: M
authors.lastname: Szpulak
authors.forename: Gabriela
authors.initials: G
authors.lastname: Statkiewicz-Barabach
authors.forename: Jacek
authors.initials: J
authors.lastname: Olszewski
authors.forename: Alicja
authors.initials: A
authors.lastname: Anuszkiewicz
authors.forename: Waclaw
authors.initials: W
authors.lastname: Urbanczyk
authors.forename: Kay
authors.initials: K
authors.lastname: Schuster
authors.forename: Jens
authors.initials: J
authors.lastname: Kobelke
authors.forename: Anka
authors.initials: A
authors.lastname: Schwuchow
authors.forename: Johannes
authors.initials: J
authors.lastname: Kirchhof
authors.forename: Hartmut
authors.initials: H
authors.lastname: Bartelt