Author: Publisher: ISBN: Category : Lasers Languages : en Pages : 148
Book Description
In this dissertation we present a simplified scalar numerical model, derived from Maxwell's field equations, for the fiber laser amplifier simulations. Maxwell's equations are reduced using a technique called Coupled Mode Theory (CMT). The reduced model is made more efficient through a new scale model, referred to as an equivalent short fiber, which captures some of the essential characteristics of a longer fiber. The equivalent short fiber can be viewed as a fiber made using artificial (nonphysical) material properties that in some sense compensates for its reduced length. The computations can be accelerated by a factor approximately equal to the ratio of the original length to the reduced length of the equivalent fiber. Computations using models of two commercially available fibers -- one doped with ytterbium, and the other with thulium-show the practical utility of the concept. Extensive numerical studies are conducted to assess when the equivalent short fiber model is useful and when it is not. Fiber quantum defect heating is included in the model. We solve the heat equation coupled with our CMT equation to get the solution. Transverse Mode Instability (TMI) is observed in both ytterbium and thulium doped fibers. Various power thresholds are presented for TMI. Also, to find the root cause of TMI and to investigate how to mitigate this chaotic process, we have experimented with different refractive index gratings. A few gratings are presented with numerical results which show promises. Finally this dissertation uses numerical simulations of a thulium-doped optical fiber amplifier to predict various performance characteristics such as peak temperatures, expected output powers and efficiencies, presence of Amplified Spontaneous Emission (ASE), et cetera. Single- and two-tone configurations are studied. In the latter case, the two laser sources are separated in frequency by the amount that corresponds to the peak Raman gain, and a few seed ratios at various total seed powers are examined. To reduce the excessive computational time and resources needed to simulate the CMT equations and also to study TMI efficiently after sufficient number of time-steps, the code is parallelized using both shared and distributed memory configurations. The techniques employed in this strategy give linear speedup as we increase the number of time-steps for a fixed number of nodes.
Author: Philippe M. Becker Publisher: Elsevier ISBN: 0080505848 Category : Technology & Engineering Languages : en Pages : 482
Book Description
Erbium Fiber Amplifiers is a comprehensive introduction to the increasingly important topic of optical amplification. Written by three Bell Labs pioneers, the book stresses the importance of the interrelation of materials properties, optical properties, and systems aspects of optical fiber amplifiers. All disc-based content for this title is now available on the Web. Key Features* Explains the theory of noise in optically amplified systems in an intuitive way* The book contains a discussion of components used in amplifier fabrication and of the attendant technologies used in real systems* The book provides basic tools for amplifier design as well as systems engineering, including the latest developments in WDM and soliton systems* The book discusses the fundamentals of rare earth ions for the reader desiring more depth in the topic* The book is for either the novice of experienced reader* The chapter have links between them to allow the reader to understand the relationship between the amplifier characteristics, noise, and systems applications* The book contains extensive references
Author: Zhongmin Yang Publisher: Springer ISBN: 9811360804 Category : Science Languages : en Pages : 174
Book Description
This book gives a contemporary overview of the technologies of single-frequency fiber lasers. The development of single-frequency fiber lasers is one of the most significant achievements in the field of laser photonics over the past two decades. Owing to the crucial demands of a laser sources with highly stable single-frequency operation, narrow linewidth, low noise, scalable to high output power, compact and robustness structure, fiber lasers have been intensively studied since its introduction to the single-frequency laser community and they still continuously proceed to trigger the emergence of new technologies and applications. This book systematically demonstrates the single-frequency fiber laser technologies from fundamental principles to state-of-the-art progress. Details of selected typical applications of single-frequency fiber lasers are also given and discussed. The reader will acquire a good knowledge of the current situation within this important field.
Author: P. C. Becker Publisher: ISBN: 9780120845903 Category : Science Languages : en Pages : 460
Book Description
The user can vary, via Windows based input screens, various amplifier characteristics such as fiber length, pump power, signal power, and additional signals. The output is savedin a file which can be read by any spreadsheet or plotting package for graphical representation of the results. The software allows the reader to explore on his or her own the concepts of amplifier performance discussed in the book, and gain a more intuitive and interactive educational experience leading to a richer understanding of erbium-doped fiber amplifiers and their applications.-
Author: Michel J.F. Digonnet Publisher: CRC Press ISBN: 0824741641 Category : Technology & Engineering Languages : en Pages : 956
Book Description
A discussion of the theories, operating characteristics, and current technology of main fiber laser and amplifier devices based on rare-earth-doped silica and fluorozirconate fibers. It describes the principles, designs, and properties of the erbium-doped fiber amplifier and its role as the cornerstone component in optical communication systems. This second edition contains new and revised material reflecting major developments in academia and industry.
Author: Emmanuel Desurvire Publisher: Wiley-Interscience ISBN: Category : Science Languages : en Pages : 824
Book Description
Praise for Emmanuel Desurvire's Erbium-Doped Fiber Amplifiers: Principles and Applications "The book is an indispensable reference for researchers, development engineers, and system designers in fiber-optic communications. . . . It will excel as an introductory text in upper-level undergraduate and graduate courses on system applications of fiber optics." -Optik "One of the most comprehensive and detailed accounts of the physics and fundamental principles of erbium-doped fiber amplifiers. . . . I do not hesitate to recommend the book enthusiastically to anyone having an interest in EDFAs and their applications." -Physics Today Erbium-doped fiber amplifiers are an important technology for lightwave voice, video, and data transmission. In his previous book, Erbium-Doped Fiber Amplifiers: Principles and Applications, Emmanuel Desurvire offered an important exploration of the then-infant technology of erbium-doped fiber amplifiers. The passage of the 1996 Telecommunications Act and the growth of the Internet have sparked intense demand for expanded bandwidth in all network layers, resulting in significant advances in EDFA technology. Erbium-Doped Fiber Amplifiers: Device and System Developments brings telecommunications professionals up to date. Combining the contributions from four international experts in EDFAs, this new volume expands the reader's conceptual understanding of EDFAs and covers the developmental issues of EDFAs that are relevant to modern telecom applications. The authors review: * New aspects in EDFA modeling, including the standard confined-doping, the transcendental-power-equation, and average-inversion-level models * Design concepts for EDFAs in terrestrial and submarine WDM systems * Transmission fiber design and dispersion-management techniques for terabit/s systems * Amplified submarine-cable systems, including a brief history of submarine-cable communications and the investigation of terabit/s system technologies * Advanced concepts in the physics of noise in amplified light, noise figure definitions, entropy, and ultimate capacity limits Delving into fundamental concepts (including a wealth of previously unpublished materials) as well as important breakthroughs, this much-needed resource will place telecom engineers in a position to take advantage of every aspect in the broad potential of EDFAs.
Author: Richard I. Epstein Publisher: John Wiley & Sons ISBN: 3527628053 Category : Science Languages : en Pages : 258
Book Description
Edited by the two top experts in the field with a panel of International contributors, this is a comprehensive up-to-date review of research and applications. Starting with the basic physical principles of laser cooling of solids, the monograph goes on to discuss the current theoretical issues being resolved and the increasing demands of growth and evaluation of high purity materials suitable for optical refrigeration, while also examining the design and applications of practical cryocoolers. An advanced text for scientists, researchers, engineers, and students (masters, PHDs and Postdoc) in laser and optical material science, and cryogenics.
Author: Yan Feng Publisher: Springer ISBN: 331965277X Category : Science Languages : en Pages : 364
Book Description
This book serves as a comprehensive, up-to-date reference about this cutting-edge laser technology and its many new and interesting developments. Various aspects and trends of Raman fiber lasers are described in detail by experts in their fields. Raman fiber lasers have progressed quickly in the past decade, and have emerged as a versatile laser technology for generating high power light sources covering a spectral range from visible to mid-infrared. The technology is already being applied in the fields of telecommunication, astronomy, cold atom physics, laser spectroscopy, environmental sensing, and laser medicine. This book covers various topics relating to Raman fiber laser research, including power scaling, cladding and diode pumping, cascade Raman shifting, single frequency operation and power amplification, mid-infrared laser generation, specialty optical fibers, and random distributed feedback Raman fiber lasers. The book will appeal to scientists, students, and technicians seeking to understand the recent developments and future trends of this promising and multifaceted technology.
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Author: Philippe M. Becker
Author: Zhongmin Yang
Author: P. C. Becker
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Author: Michel J.F. Digonnet
Author: Emmanuel Desurvire
Author: Richard I. Epstein
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Author: Yan Feng