Patent ID: 6559987
Filing Date: 2003-05-06
Classification: H04B

Abstract:
An optical network, comprising:a plurality of nodes, each node having a transmitter for transmitting a set of â€œnâ€  wavelengths, and a receiver for receiving another set of â€œnâ€  wavelengths, the set of wavelengths of the transmitter being different from the set of wavelengths of the receiver, and the total number of the wavelengths to be used in the network being equal to â€œ2nâ€ ; wavelengths of transmitters and receivers at different nodes being arranged so that for any pair of nodes there is at least one common wavelength which is the same for one of the transmitter and receiver at one node and one of the respective receiver and transmitter at the other node; and for any pair of nodes there are at least two common wavelengths, the first and second common wavelengths, the first wavelength being the same for the transmitter at one node and the corresponding receiver at the other node in the pair, and the second wavelength being the same for the receiver at one node and the corresponding transmitter at the other node in the pair, thus providing a direct connection between the nodes.