TAILIEUCHUNG - ADVANCES IN OPTICAL AMPLIFIERS

Optical Amplifi ers and Their Applications in Networks Optical amplifi ers are essential elements in advanced fi bre-based telecommunications networks. They provide the means to counteract the losses caused by the fi bre transmission medium, the components placed in the propagation path and the power division at optical splitt ers. | ADVANCES IN OPTICAL AMPLIFIERS Edited by Paul Urquhart Advances in Optical Amplifiers Edited by Paul Urquhart Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2011 InTech All chapters are Open Access articles distributed under the Creative Commons Non Commercial Share Alike Attribution license which permits to copy distribute transmit and adapt the work in any medium so long as the original work is properly cited. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Ana Nikolic Technical Editor Teodora Smiljanic Cover Designer Martina Sirotic Image Copyright Katharina Wittfeld 2010. Used under license from First published February 2011 Printed in India A free online edition of this book is available at Additional hard copies can be obtained from orders@ Advances in Optical Amplifiers Edited by Paul Urquhart p. cm. ISBN 978-953-307-186-2 I kfTC LI OPEN ACCESS INI Evn PUBLISHER INTECH open free online editions of InTech Books and Journals can be found at .

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