Patent ID: 7856182

Claim:
A system for optical transmission of information over a multiplexed logical ring structure, comprising a number of nodes, wherein said multiplexed logical ring structure is a combination of a number of logical optical rings, each at a specific wavelength, on the same physical fibre ring, wherein each logical optical ring links a number of optical add/drop multiplexer (OADM) nodes, such that the wavelength defining said logical optical ring is added or dropped, while the other wavelengths go through with minimum cross talk; and wherein each of the OADM nodes is configured to drop information associated with the wavelength defining the logical optical ring from the physical fibre ring, actively process the information in an OADM node information processor, and transmit by an OADM node optical transmitter including a laser diode to add the processed information and other information if available to the physical fibre ring at the same wavelength as the OADM node receives information.