| http://www.w3.org/ns/prov#value | - Alternatively, the optical nodes in the above examples of ring networks with either one or both of (1) the circulating optical probe signal in the ring and (2) the node-to-node communications can be implemented to have optical nodes based on reconfigurable optical add and drop multiplexers or modules (ROADM) for various applications, such as metro and regional optical networks.
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