| 摘要 |
A photonic crystal fiber includes a core region for propagating light in a longitudinal direction of the fiber, a cladding region surrounding the core region, the cladding region including micro-structural elements extending in the longitudinal direction. The cladding region further includes at least one stress element having a coefficient of thermal expansion alpha<SUB>T,SAP </SUB>and extending in the longitudinal direction of the photonic crystal fiber, the stress element(s) being located in a cladding background material having a coefficient of thermal expansion alpha<SUB>T,cladback </SUB>different from alpha<SUB>T,SAP</SUB>. The location of the at least one stress element relative to the core region and the micro-structural elements and the coefficients of thermal expansion alpha<SUB>T,SAP </SUB>and alpha<SUB>T,cladback </SUB>are adapted to provide a stress induced birefringence in the core region of the photonic crystal fiber. An article includes a photonic crystal fiber, a method of manufacturing and the use of a photonic crystal fiber are furthermore provided.
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