MICROSTRUCTURED OPTICAL FIBRES AND DESIGN METHODS

摘要

The present invention relates to an optical fiber structure (100)comprising a core (110) and a cladding region (120) surrounding the core. The cladding region (120) comprises a plurality of longitudinal holes (122), wherein the plurality of longitudinal holes (122) is adapted in configuration for inducing a focusing effect in a direction transverse to the length direction of the optical fiber structure (100). In this way a photonic crystal lens can be embedded in the optical fiber for efficient transverse coupling in or out of the core (110) area of the fiber. Such fibers may especially be suitable for fiber Bragg grating inscription. The present invention also relates to corresponding methods.