Light Tree Essay

5142 words - 21 pages

LIGHT TREE

A SEMINAR REPORT Submitted By

SUJIT KUMAR
In partial fulfillment of the award of the degree of

BACHELOR OF TECHNOLOGY IN COMPUTER SCIENCE AND ENGINEERING

SCHOOL OF ENGINEERING COCHIN UNIVERSITY OF SCIENCE & TECHNOLOGY KOCHI-682022 SEPTEMBER 2008

DIVISION OF COMPUTER SCIENCE AND ENGINEERING SCHOOL OF ENGINEERING COCHIN UNIVERSITY OF SCIENCE & TECHNOLOGY, COCHIN-682022

Certificate

Certified that this is a bonafide record of the Seminar Entitled

“Light Tree”
Done by the following Student Sujit Kumar Of the VIIth semester, Computer Science and Engineering in the year 2008 in partial fulfillment of the requirements to the award of Degree Of Bachelor Of ...view middle of the document...

A light tree is a point to point multipoint all optical channel, which may span multiple fiber links. Hence, a light tree enables single-hop communication between a source node and a set of destination nodes. Thus, a light tree based virtual topology can significantly reduce the hop distance, thereby increasing the network throughput.

A light path is an all-optical channel, which may be used to carry circuit switched traffic, and it may span multiple fiber links. Assigning a particular wavelength to it sets these up. We refer light tree as a point to multi point extension of light path.

In the near future, WANs will be based on WDM optical networks. So far, all architectures that have been proposed for WDM WANs have only considered the problem of providing unicast services. In addition to unicast services future WDM WANs need to provide multicast and broadcast services. A novel WDM WAN architecture based on light trees that are capable of supporting broadcasting and multicasting over a wide-area network by employing a minimum number of opto-electronic devices was discussed. Such WDMWAN can provide a very high bandwidth optical layer, which efficiently routes unicast, broadcast and multicast packet-switch traffic.

TABLE OF CONTENTS
Chapter No. Title Page No.

List of Tables………………………………………………I List of Figures…………………………………………….II

1

Introduction..........................................................................1 1.1 Overview…….........................................................1 1.2 Classification of physical topology networks..........1 1.3 Types of WDM……………………………………4 1.4 Comparisons between CWDM & DWDM………..4

2

Light Path……………….....................................................5 2.1 Definition……………………................................5

3

Light Trees………………………………............................6 3.1 Definition……........................................................6 3.2 An Example......................................................…...7 3.3 Requirements...........................................................8

4

Architecture of wavelength-routed optical network……....10 4.1 Architecture View………………………………..10

5

Multicast Switch Architectures…………………………...12 5.1 An Example of Multicast Switch Architecture…...12 5.2 Formula Derivation………………………………13

6

An MWRS based on a splitter bank……………………...14 6.1 An Example of multicast-capable Wavelength-routing switch……………………..15

7

MWRS based on a “drop and continue” switch………….16 7.1 Technique………………………………………...16

8

The Optical Layer………………………………………..17 8.1 Definition…………………………………………17 8.2 Features of Optical Layer………………………....17

9

Unicast, Broadcast & Multicast Traffic…………………19 9.1 Unicast Traffic……………………………………19 9.2 Broadcast Traffic………………………………….21 9.3 Multicast Traffic…………………………………..22 9.4 Combining Unicast & Multicast Traffic…………..23

10

Light Trees Problem Formulation………………………..25 10.1 Unicast Traffic 10.1.1 Formulation of...

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