Patent ID: 6437888
Filing Date: 2002-08-20
Classification: H04J

Abstract:
A device for adding and dropping optical signals to and from an optical transmission path comprising:an input for a plurality of optical signals with distinct wavelengths; a spectral selection circuit to send at least a first of said signals to a first optical path and a second of said signals to a second optical path; a wavelength selective switch along said first optical path to add and drop at least an optical signal to and from said first optical path; and a combiner to combine optical signals from said first and said second path to an output; said spectral selection circuit comprising: a divider to divide said plurality of optical signals in a first and a second series of optical signals, mutually staggered in wavelength; and a transmission circuit to send said first series of optical signals to said first optical path and said second series of optical signals to said second optical path.