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Modenfilter mit Brechzahlmodifikation

Mode filter with refractive index modification
: Voigtländer, Christian; Thomas, Jens Ulrich; Nolte, Stefan; Tünnermann, Andreas; Williams, Robert

Frontpage ()

DE 102011114586 A1: 20110930
Patent, Electronic Publication
Fraunhofer IOF ()

The invention relates to a mode filter for reducing higher-order modes, with an optical fibre (1), which has a core (2) and a cladding (3) surrounding the latter, wherein the cladding (3) and core (2) have refractive indices that differ from one another. In order to develop an alternative to the prior art, the mode filter according to the invention is designed in such a manner that the fibre (1) has, in a transition region (4) between core (2) and cladding (3), at least one local refractive index modification region (5) which is arranged in the radially outer region of the core (2) and extends into the region of the cladding (3).