Konstantinos Manousakis

Learn More
We consider the offline version of the routing and wavelength assignment (RWA) problem in transparent all-optical networks. In such networks and in the absence of regenerators, the signal quality of transmission degrades due to physical layer impairments. Because of certain physical effects, routing choices made for one lightpath affect and are affected by(More)
Physical impairments in optical fiber transmission necessitate the use of regeneration at certain intermediate nodes, at least for certain lengthy lightpaths. We design and implement impairment-aware algorithms for routing and wavelength assignment (IA-RWA) in translucent optical networks. We focus on the offline version of the problem, where we are given a(More)
In translucent (or managed reach) WDM optical networks, regenerators are employed at specific nodes. Some of the connections in such networks are routed transparently, while others have to go through a sequence of 3R regenerators that serve as “refueling stations” to restore their quality of transmission (QoT). We extend an online multicost algorithm for(More)
We design and implement various algorithms for solving the static RWA problem with the objective of minimizing the maximum number of requested wavelengths based on LP relaxation formulations. We present a link formulation, a path formulation and a heuristic that breaks the problem in the two constituent subproblems and solves them individually and(More)
We design and implement a multicost impairmentaware routing and wavelength assignment algorithm for online traffic. In transparent optical networks the quality of a transmission degrades due to physical layer impairments. To serve a connection, the proposed algorithm finds a path and a free wavelength (a lightpath) that has acceptable signal quality(More)
To make future tactical battlefield networks more agile, flexible and robust, nodes must rapidly configure themselves with little or no human intervention; moreover they must reconfigure automatically as the environment changes. We present our approach to configuring and reconfiguring an entire network domain, possibly consisting of tens of thousands of(More)
We consider the offline version of the routing and wavelength assignment problem in transparent all-optical networks. In such networks and in the absence of regenerators, the signal quality of a transmission degrades due to physical layer impairments. Certain physical effects cause choices for one lightpath to affect and be affected by the choices made for(More)
In a wavelength-routed optical network, the signal remains in the optical domain over the entire route (lightpath) from source to destination node. Thus, while propagating through the network, the signal quality may degrade as it encounters physical impairments. In this paper, we study the establishment of new connections in such a network in the presence(More)
We consider the offline version of the impairment-aware routing and wavelength assignment (IA-RWA) problem in transparent all-optical networks as a cross layer optimization problem. In optical networks and in the absence of regenerators, optical signal quality degrades due to physical layer impairments. We initially present an algorithm for solving the RWA(More)