title: Stress induced birefringence in hybrid TIR/PBG guiding solid photonic crystal fibers.
abstract: We report on two types of polarization maintaining solid photonic crystal fibers that guide light by a combination of a photonic bandgap and total internal reflection. Group and phase birefringence are studied experimentally and numerically for stress-applying parts made from B-doped and F-doped silica. The stress field originating from Ge-doped cladding rods is shown to interfere with the stress field from the B-doped and F-doped rods. Since the differential expansion coefficients of B-doped and F-doped silica have opposite signs this interference is either destructive or constructive. Consequently, we found that the fiber with F-doped stress applying parts has the highest modal phase birefringence, and polarization cross talk is characterized by an h-parameter below 310(-5) m(-1).
authors.affiliation: NKT Photonics A/S, Blokken 84, Birkerød, Denmark. jkl@nktphotonics.com
authors.forename: J K
authors.initials: JK
authors.lastname: Lyngsø
authors.forename: B J
authors.initials: BJ
authors.lastname: Mangan
authors.forename: C B
authors.initials: CB
authors.lastname: Olausson
authors.forename: P J
authors.initials: PJ
authors.lastname: Roberts
mesh_terms: D001718:Birefringence; D003460:Crystallization; D005336:Fiber Optic Technology / Q000379:methods*; D005857:Germanium / Q000737:chemistry*; D008962:Models, Theoretical; D055100:Optical Fibers; D012822:Silicon Dioxide / Q000737:chemistry*; D013314:Stress, Mechanical
chemical_list: D005857:Germanium; D012822:Silicon Dioxide