An apparatus for demultiplexing a wavelength division multiplexed optical signal includes a plurality of wavelength channels each having a different signal wavelength. The apparatus includes a signal port and a plurality of grating modules. Each grating module has a coupler and a fiber Bragg grating...http://www.google.es/patents/US20030026529?utm_source=gb-gplus-sharePatente US20030026529 - Optical demultiplexer
