Wavelength Division Multiplexing (WDM) technology evolved to effectively utilize the enormous bandwidth of optical fiber.In circuit-switched WDM networks lightpaths are used to transfer data between a given pair of nodes.A lightpath is an all-optical channel established between the given pair of nodes by configuring the Wavelength Routing Switches (WRS) at the intermediate nodes along the path.In a WRS, the time required to reconfigure the switch is often long when compared to the speed of data passing through the switch, and it has significant impact on the performance of the network.In this paper, we present a new technique to mitigate the lightpath set-up time overheads in Dynamic Lightpath Establishment (DLE) algorithms for wavelength continuous circuit switched all-optical networks.Sim ulation studies indicate that the new technique significantly reduces the number of reconfigurations required to set-up new lightpaths. © 1999 Springer-Verlag Berlin Heidelberg.

Sreenivasa Kumar P

Department of Computer Science and Engineering

M. Shiva Kumar

ALL-OPTICAL NETWORKS

DYNAMIC LIGHTPATH ESTABLISHMENTS

Intermediate node

SET-UP TIME

WAVELENGTH DIVISION MULTIPLEXING TECHNOLOGIES (WDM)

WAVELENGTH ROUTED

WAVELENGTH ROUTING SWITCHES

WDM networks

Electric network analysis

Optical communication

Wavelength division multiplexing

Fiber optic networks

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Minimizing Lightpath Set-up Times in Wavelength Routed All-Optical Networks

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Wavelength routed optical networks have emerged as a technology that can effectively utilize the enormous bandwidth of the optical fiber. Wavelength converters play an important role in enhancing the fiber utilization and reducing the overall call blocking probability of the network. As the distortion of the optical signal increases with the increase in the range of wavelength conversion in optical wavelength converters, limited range wavelength conversion assumes importance. Placement of wavelength converters is a NP complete problem [K.C. Lee, V.O.K. Li, IEEE J. Lightwave Technol. 11 (1993) 962-970] in an arbitrary mesh network. In this paper, we investigate heuristics for placing limited range wavelength converters in arbitrary mesh wavelength routed optical networks. The objective is to achieve near optimal placement of limited range wavelength converters resulting in reduced blocking probabilities and low distortion of the optical signal. The proposed heuristic is to place limited range wavelength converters at the most congested nodes, nodes which lie on the long lightpaths and nodes where conversion of optical signals is significantly high. We observe that limited range converters at few nodes can provide almost the entire improvement in the blocking probability as the full range wavelength converters placed at all the nodes. Congestion control in the network is brought about by dynamically adjusting the weights of the channels in the link thereby balancing the load and reducing the average delay of the traffic in the entire network. Simulations have been carried out on a 12-node ring network, 14-node NSFNET, 19-node European Optical Network (EON), 28-node US long haul network, hypothetical 30-node INET network and the results agree with the analysis. © 2001 Elsevier Science B.V. All rights reserved.

Fulltext

Computer Networks

A heuristic for placement of limited range wavelength converters in all-optical networks

IEEE/ACM Transactions on Networking

Adaptive wavelength routing in all-optical networks

IEEE Transactions on Communications

Lightpath communications: an approach to high bandwidth optical WAN's

Computer

The future of fiber-optic computer networks

IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)

Fixed-alternate routing and wavelength conversion in wavelength-routed optical networks

Minimizing lightpath set-up times in wavelength routed all-optical networks

Journal	Data powered by TypesetLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Publisher	Data powered by TypesetSpringer Nature
ISSN	03029743
Open Access	No