Network planning strategies for next-generation flexible optical networks [invited]


Using well-established results on nonlinear propagation modeling in coherent optical links, two totally different approaches for network planning are addressed and compared in terms of performance maximization and robustness to dynamic changes in the network, one based mostly on maximization of the margin in the optical signal-to-noise ratio, the opposite on minimization of the pre-forward-error-correction bit error rate (BER). We tend to show that, in pure coherent optical networks, the design strategy that best supports the dynamic evolution of the network is the planning aimed toward BER minimization. A closed-form formula for the maximum reach (in terms of range of spans and loss budget) of each interface is analytically derived, which could be a helpful tool for the analysis of the network value for a desired traffic capability.

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