Patent ID: 6226426
Filing Date: 2001-05-01
Classification: G02B

Abstract:
Wavelength demultiplexing device of a plurality N of spectrum lines (.lambda.1 to .lambda..sub.N) that together constitute an optical spectrum (6) and that are each capable of fluctuating in a determined spectral region comprising:an energy separator (2a, 2b, 2c) having an input (4) that is designed to receive the optical spectrum (6) and a plurality N of outputs (8) that are each adapted to provide a respective fraction of the optical spectrum light energy, anda plurality N of optical wavelength filters (12) each of which is connected to a particular output of the energy separator and has a wavelength bandpass that contains the spectral region associated with one of these lines (.lambda..sub.i) of the optical spectrum and that, therefore, only filters this particular ray (.lambda..sub.i), each filter being designed to filter a different line,this device being characterized in that each of the optical filters (12) is constituted by a single, wavelength selective light reflector that is adapted to reflect a single line (.lambda..sub.i) of the optical spectrum that is different for each selective reflector, and in that each of these selective reflectors (12) is associated with means (14) to direct the line thus reflected line (.lambda..sub.i) in a different direction to that taken by the incident line on the selective reflector.