A mode conversion apparatus including a dynamic waveguide section associated with a plurality of control elements that, when activated, are able to produce a periodic refractive-index perturbation pattern in the dynamic waveguide section, wherein the periodic refractive-index perturbation pattern is...http://www.google.fr/patents/US7218814?utm_source=gb-gplus-shareBrevet US7218814 - Method and apparatus for optical mode conversion
