A cross-connect switch for fiber-optic communication networks employing a wavelength dispersive element, such as a grating, and a stack of regular (non-wavelength selective) cross bar switches using two-dimensional arrays of micromachined, electrically actuated, individually-tiltable, controlled deflection...http://www.google.com.au/patents/US6327398?utm_source=gb-gplus-sharePatent US6327398 - Multi-wavelength cross-connect optical switch
