The modified star-ring architecture for high-capacity subcarrier multiplexed passive optical networks

A modified star-ring architecture (MSRA) consisting of a star network on th e upper level and many concatenated ring subnets on the lower level is prop osed for subcarrier multiplexed passive optical network (SCM-PON), The uppe r level star network ensures high network capacity and its weakness in reli ability is overcome by the concatenated ring subnets with self-healing capa bilities, The self-healing function can be performed at remote nodes (RNs) by using optical switches (OS) to reconfigure the ring subnets if any link fails, Moreover, we design the cascade add/drop transceiver (CAT) structure in the lower level ring subnets to completely eliminate the optical beat i nterference (OBI) problem and achieve an OBI-free optical network. Finally, we set up an experimental network to demonstrate the feasibility of this c ost-effective survivable structure.