A device for filtering light propagating within waveguides, including optical fibers. The device includes an optical filter, a first waveguide section and a second waveguide section positioned between the filter and the first waveguide section. The diameter of the second waveguide section is greater...http://www.google.fr/patents/US6208783?utm_source=gb-gplus-shareBrevet US6208783 - Optical filtering device
