Patent ID: 7995923

Claim:
A method for control of multiplexing channels in a fiber optic communication system with spectral compression of 2 N channels, whose optical frequencies capable to be tuned within a constant spectral interval Δv between neighboring channels, said method comprises the steps of: (a) inputting 2 N channels separately at 2 N individual inputs of an N-stage structure of a tree-type, said N-stage structure comprising in each n stage 2 N-n optical filters, wherein n=1, 2, . . . , N, each said filter contains two inputs and at least one output, the filters are capable of controllable tuning transmission coefficients, and the filters are characterized by a transmission coefficients in the form periodic function with frequency separation between neighboring extremums Δv n =2 N-n Δv, wherein the inputs of said N-stage structure being each of the two inputs of each optical filter of the first stage; (b) tuning the optical filter of each stage of said N-stage structure so that the transmission for each of 2 N channels from one of 2 N said individual inputs at the output reaches a maximal value; and (c) transmitting 2 N channels through said N-stage structure and receiving the multi-channel optical signal at the output of the optical filter of the last stage of the N-stage structure.