Enabling Extended Access with Light-Trees and Point-to-Multipoint Coherent Transceivers

We present an architecture that supports light-trees so that point-to-multipoint (P2MP) transceivers can be placed deeper in the metro-core network. It enables flexible aggregation from multiple access nodes in horseshoes or rings, maintaining the P2MP multiplexing gain under heavy traffic. The architecture simulation shows that the advantages are more pronounced in settings where the light-trees span a metro-core distance equal to 200 km irrespective of the traffic conditions.