An optical device (10) for use in beamsplitting, recombination and related applications incorporates a rectangular multimode waveguide (20) connecting a first coupling waveguide (18) to two second coupling waveguides (22, 24). The first coupling waveguide (18) operates in its fundamental mode and provides...http://www.google.fr/patents/US5410625?utm_source=gb-gplus-shareBrevet US5410625 - Optical device for beam splitting and recombining
