A wavelength division method and system employing a radiation transmissive planar waveguide provided with collimating and focusing lenses and with a periodic radiation transmissive diffraction grating incorporating radiation reflecting elements in spaced array, preselected, in demultiplexing service,...http://www.google.fr/patents/US4773063?utm_source=gb-gplus-shareBrevet US4773063 - Optical wavelength division multiplexing/demultiplexing system
Optical wavelength division multiplexing/demultiplexing system
