Abstract
This paper addresses the problem of reducing power excursions in amplified wavelength
division multiplexed networks with reconfigurable optical add-drop multiplexers (ROADM) and
wavelength selective switches (WSS). In dynamic network loading scenarios, conventional WSS
control leads to transient power excursions across the chain. Two WSS control strategies are
considered: an integral-control and a modified integral-coordinated control for tracking. For both
algorithms, convergence at an isolated node is shown to depend on the optical amplifier nonlinear
gain coupling quantified by its Lipschitz constant. In a chain network with independently
controlled ROADM nodes, the modified WSS control effectively decouples the nodes and reduces WSS
transient power excursions across the chain. The bounds on these reductions are quantified
analytically with respect to the
$L_2$
norm, by applying Lyapunov analysis techniques for the interconnected chain
system. Numerical results that verify and compare the two WSS control strategies are provided by
implementation on a Transparent Optical Mesh (ATOM) platform for two realistic dynamic network
loading scenarios.
© 2013 IEEE
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