The internet transport infrastructure is evolving towards a model of high speed routers interconnected by intelligent optical networks. In this paper, we review current optical networking architectures and describe a new concept proposed in [1] called light-trails. We develop light-trails as a novel and amenable control and management solution to address IP-centric communication problems at the optical layer. We implemented a test bed to demonstrate light-trail feasibility. We also present three medium access control protocols for light-trails and evaluate their performance. The goal of light-trails and our solution is to combine commercially available components with emerging network technologies to provide a transparent, reliable and highly scalable communication network.
All-optical networks are able to transport data from source to destination entirely in the optical domain. This is a departure from current optical networks that rely on optical-electrical-optical (OEO) conversion at each intermediate connection node to route data properly. The opacity inherent in traditional networks is costly in terms of limiting bandwidth and increasing switching complexity. MPLS, OBS and OPS have been proposed as solutions for realizing an all-optical network. MPLS and OBS have the advantages of creating all-optical connections between nodes, but do not allow intermediate nodes to use the wavelength as well. Additionally, optical switches are constantly being reconfigured to accommodate new connections. OPS can make switching decisions in the optical domain, but the technology is immature. Light trail technology tries to avoid the pitfalls of immature technology, the inability of intermediate nodes to use a connection wavelength, and the constant reconfiguration of switches. A light trail is a unidirectional optical bus between nodes that allows intermediate nodes to access the bus. The goal is to minimize the amount of active switching that needs to be done by allowing intermediate nodes to use a connection that has already been setup. Connections are not constantly being setup and torn down, but rather exist for as long as they are being used by any of the nodes along their light trail.
The Radon transform (RT) is a widely studied algorithm used to perform image pattern extraction in fields such as computer graphics, medical imagery, and avionics. Real-time implementation of the discrete RT (DRT) is extremely difficult due to its use of complex trigonometric functions and O(N 3 ) time complexity, making its use in video applications difficult. A O(N 2 lgN ) approximate discrete (ADRT) has been presented in literature [1] that allows highly parallel computation. This paper presents an architecture that uses the ADRT to create a computation architecture known as the xADRT. Performance analysis indicates that it can achieve a refresh rate of 10 frames per second for use in real-time image processing applications.
Telecommunication networks have rapidly added staggering amounts of capacity to their long haul networks at low costs per bit using DWDM technologies. Concurrently, there has been a wave of new access technologies that are driving customers to demand high-speed, robust and customized data services. These dynamics have led to what is called the "metro gap" -the inability to leverage the backbone capacity to create and distribute revenue generating services. This paper presents work 1 in progress at Iowa State Universities' High Speed Systems Engineering laboratory to address the metro gap problem. As an initial step towards solving this problem, we demonstrate a streaming media application implemented utilizing Field Programmable Gate Arrays (FPGAs) on a 3 Gbps optical fiber network employing light-trail technology [1]. The testbed and application presented within illustrates a cost-effective platform and outlines high-speed system level design challenges and solutions. This complete solution enables high-bandwidth services to move closer to the user premises by combining commercially available network components and emerging network technologies.
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