Issues for routing in the optical layer
IEEE Communications Magazine
Computer Networks: The International Journal of Computer and Telecommunications Networking
Impairment-aware routing and wavelength assignment in translucent networks: state of the art
IEEE Communications Magazine
Path computation element in telecom networks: recent developments and standardization activities
ONDM'10 Proceedings of the 14th conference on Optical network design and modeling
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Transparent optical mesh networks are an appealing solution to provide cost-effective high bandwidth connections eliminating the need of expensive intermediate electronic regenerators. However, the implementation of transparent optical networks requires to take into account physical impairment information for effective lightpath set-up. In this paper, we present two distributed solutions to encompass physical impairments based on enhancements of the GMPLS protocol suite. Specifically, both GMPLS routing protocol and signaling protocol extensions are presented and discussed. An alternative centralized approach based on an impairment-aware Path Computation Element (PCE) is also proposed. The distributed routing approach exhibits convergence limitations, while the distributed signaling approach is scalable and effective. The latter is then compared against the centralized PCE approach through simulations considering both a metro network and a more complex WDM network scenario. In addition, experimental implementations of the two approaches are presented. Results show the trade-off of the two approaches, demonstrating the general good performance in terms of lightpath set up time for both approaches.