Wavelength layer recovery in transparent optical networks

Ultra-high capacity transmission systems utilizing dynamic photonic switches enable transparent networking with reduced optoelectronic conversions and simplified and automated operations and maintenance. Due to recent advances in control functions for wavelength switching in optical networks, network service providers envision the same level of automated connection provisioning and restoration capabilities at the wavelength layer as offered by time division multiplexing (TDM) or packet switched networks. Implementing Generalized Multiprotocol Label Switching (GMPLS), transparent networks can offer a high level of reliability with automatic restoration as well as reduced resources compared to legacy 1 + 1 protection mechanisms. Based on preplanned path computation, selection, signaling, and allocation of optical resources, three recovery schemes are described in the context of the wavelength connections: protection, dynamic restoration, and a combination of protection and restoration. Through the use of network simulations, we analyze the impact of transparency constraints such as optical switch activation delay and sequential light path establishment on the recovery time. This analysis includes the trade-off between different recovery strategies and transmission system reach. é 2010 Alcatel-Lucent.

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