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The deployment of Gigabit Ethernet in corporate and ISP networks makes the transmission over WDM networks necessary to provide for the interconnection over metropolitan and wide area WDM networks. As the specifications of the optical signal between Gigabit Ethernet and the WDM-network mismatch, a transponder is needed. We propose an architecture for a Gigabit Ethernet over WDM transponder and report on a transponder prototype implementation. We further show how to use the transponder for Gigabit Ethernet networks over WDM rings.

A key issue for the Operation & Maintenance (OAM) of an all-optical transport network is failure localisation in the network. The WDM supervision concept in the ACTS project PHOTON (Photonic Transport Overlay Network) achieves this by the introduction of defects and maintenance signals similar to existing transport networks. In the following this concept is explained.