January 24, 2021

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Fiber Bragg Gratings

Fiber Bragg Gratings
Author : Raman Kashyap
Publisher : Academic Press
Release Date : 2009-10-23
Category : Science
Total pages :632
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Provides an overview of Fiber Bragg Gratings (FBGs), from fundamentals to applications Evaluates the advantages and disadvantages of particular applications, methods and techniques Contains new chapters on sensing, femtosecond laser writing of FBGs and poling of glass and optical fibers Includes a special version of the photonic simulator PicWave(tm), allowing the reader to make live simulations of many of the example devices presented in the book. This fully revised, updated and expanded second edition covers the substantial advances in the manufacture and use of FBGs in the years since the publication of the pioneering first edition. It presents a comprehensive treatise on FBGs and addresses issues such as the merits of one solution over another; why particular fabrication methods are preferred; and what advantages a user may gain from certain techniques. Beginning with the principles of FBGs, the book progresses to discuss photosensitization of optical fibers, Bragg grating fabrication and theory, properties of gratings, specific applications, sensing technology, glass poling, advances in femtosecond laser writing of Bragg gratings and FBG measurement techniques. In addition to material on telecommunications usage of FBGs, application areas such as fiber lasers and sensors are addressed in greater detail. This special version of Picwave is limited to modelling only the passive fibre devices covered in this book. However the full PicWave package is capable of modelling other non-linear and active devices such as laser diodes and SOAs as discussed in Chapter 8. More information about PicWave can be found at www.photond.com/products/picwave.htm. In addition to researchers, scientists, and graduate students, this book will be of interest to industrial practitioners in the field of fabrication of fiber optic materials and devices. Raman Kashyap, Canada Research Chair holder on Future Photonics Systems, and Professor at École Polytechnique, University of Montréal since 2003, has researched optical fibers and devices for over 30 years. He pioneered the fabrication of FBGs and applications in telecommunications and photonics. Provides an overview of Fiber Bragg Gratings (FBGs), from fundamentals to applications Evaluates the advantages and disadvantages of particular applications, methods and techniques Contains new chapters on sensing, femtosecond laser writing of FBGs and poling of glass and optical fibers Includes a special version of the photonic simulator PicWave(tm), allowing the reader to make live simulations of many of the example devices presented in the book

Fiber Bragg Gratings

Fiber Bragg Gratings
Author : Andreas Othonos,Kyriacos Kalli
Publisher : Artech House Optoelectronics L
Release Date : 1999
Category : Science
Total pages :422
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Fiber Bragg gratings are flexible, cost-effective and highly efficient, with a vast range of potential applications. This timely new work provides a comprehensive description of the principles and practical applications of this latest technology, which has the potential to revolutionize telecommunications and significantly impact optical fiber sensing. Here the authors explain the underlying physics and practical aspects in a clear and unambiguous manner.

Fiber Bragg Grating Sensors

Fiber Bragg Grating Sensors
Author : Hisham K. Hisham
Publisher : CRC Press
Release Date : 2019
Category : Bragg gratings
Total pages :160
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This book presents the basic principles of optical sensor technology in line with the tremendous development in the concept of optical fibers. In the first four chapters, the book discusses the basic principles of optical sensor technology in a simplified manner, making it suitable for all levels of study and research. The seven remaining chapters are concerned with the practical applications of optical sensor technology in all fields such as oil and gas, civil engineering, medical and military fields and harsh environments.

Fiber Bragg Gratings

Fiber Bragg Gratings
Author : Marcelo Martins Werneck,Regina Célia da Silva Barros Allil,Fábio Vieira Batista de Nazaré
Publisher : SPIE-International Society for Optical Engineering
Release Date : 2017
Category : Bragg gratings
Total pages :242
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"This Tutorial Text delivers essential information concerning fiber Bragg gratings to professionals and researchers with an approach based on rules of thumb and practical aspects, enabling quick access to the main principles and techniques, and allowing readers to set up their own laboratory or application. It provides detailed information about how to operate and use these novel sensors, particularly with respect to the required infrastructure, daily operation, and possible applications. After a discussion of the primary concepts, practical aspects regarding the development of a FBG laboratory and how these components are manufactured and used in practical applications are presented. The following chapters outline the operation of Bragg gratings and, for instance, discuss how measurement information can be retrieved (interrogation techniques), calibration methods, and how to prepare and deploy the devices in real monitoring conditions. The final chapters present several successful, real-world applications of the technology"--

Current Trends in Short- and Long-period Fiber Gratings

Current Trends in Short- and Long-period Fiber Gratings
Author : Christian Cuadrado-Laborde
Publisher : BoD – Books on Demand
Release Date : 2013-05-15
Category : Technology & Engineering
Total pages :196
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In this book the reader will find a collection of chapters written by different experts around the world, describing the current research trends in both short- and long-period fiber grating technology. This work is mainly addressed to researchers already working in this area, but it is also accessible to anyone with a scientific background who desires to have an updated overview of the recent progress in this domain. It will also be valuable to scientist and engineers who have become newly involved in this field. Each chapter is self-contained and can be read independently of the others. This book intends to provide highlights of the current research in this area, showing the recent advances in the field of fiber gratings.

Polymer Optical Fiber Bragg Gratings

Polymer Optical Fiber Bragg Gratings
Author : Ricardo Oliveira,Lucia Maria Botas Bilro,Rogerio Nunes Nogueira
Publisher : CRC Press
Release Date : 2019-11-12
Category : Technology & Engineering
Total pages :226
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Polymer optical fibers (POFs) have been regarded as a viable alternative to silica fibers in a variety of sensing applications. Fiber optic sensors offer key advantages over other sensing technologies, which include immunity to electromagnetic interference, compact, lightweight, multiplexing capability, and higher sensitivity. This book gives an overview of the polymer optical fiber Bragg grating (POFBG) technology over the last 20 years, covering aspects related to the fiber Bragg grating fabrication and also sensing applications. The book is split into five chapters, and it is written in such a way that can provide a comprehensive and simple route to new users, scientists and engineers working or wishing to work in the field of POFBGs: Describes the systems commonly employed for producing fiber Braggs gratings (FBGs) in silica fibers that can be used for the production of POFBGs; Explores different laser sources for the inscription of POFBGs; Explores the capability of using this technology at the visible and infrared region, in different fiber types (e.g., step-index, microstructured, unclad, highly birefringent) and in fibers composed of different polymer materials such as PMMA, doped PMMA, PS and ZEONEX; Reports the fabrication of different types of POF gratings, such as uniform, phase-shifted, tilted, chirped, and long-period gratings; Shows the opportunities of POFBGs for a variety of sensing applications. The insight to the use of POFBGs provides a vision for the opportunities of this fiber optic technology.

Full Matlab Code for Synthesis and Optimization of Bragg Gratings

Full Matlab Code for Synthesis and Optimization of Bragg Gratings
Author : Fethallah Karim
Publisher : Cambridge Scholars Publishing
Release Date : 2018-11-07
Category : Science
Total pages :578
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This book presents a theoretical description of fiber Bragg gratings, focusing on channels’ densification and the tunability of Bragg filters. It also includes a full Matlab code for the synthesis and optimization of several kinds of fiber Bragg gratings by using the directed tabu search, the simulated annealing method and the genetic algorithm. Physical and optical parameters of uniform, chirped and sampled fiber Bragg gratings are then reconstructed with these algorithms.

Fiber Bragg Gratings: Channels'densification and Tunability

Fiber Bragg Gratings: Channels'densification and Tunability
Author : Fethallah Karim
Publisher : LAP Lambert Academic Publishing
Release Date : 2014-03
Category :
Total pages :68
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This book gives an overview of Fiber Bragg gratings and specially on sampled gratings which are used in WDM transmission links. In this document, several methods for channel's densification are presented. We focus also on channel's tunability by applying strain and temperature effects. Finally, multiplexeurs and demultiplexers based on uniform Bragg gratings are presented and analyzed at the end of this manuscript.

Ultrahigh-Speed Optical Transmission Technology

Ultrahigh-Speed Optical Transmission Technology
Author : Hans-Georg Weber,Masataka Nakazawa
Publisher : Springer Science & Business Media
Release Date : 2007-12-28
Category : Technology & Engineering
Total pages :482
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This book is a detailed description of all the aspects of ultrahigh speed optical transmission technology. Ultrahigh-speed optical transmission technology is a key technology for increasing communication capacity. The devices developed for ultrahigh-speed optical transmission are not limited to communication applications only. They are key devices for high-speed optical signal processing, i.e. monitoring, measurement and control, and will thus give a wide technological basis for innovative science and technology. All these aspects of ultrahigh-speed optical transmission technology are described in detail in this book.

Tunable Fiber Bragg Grating Using Evanescent Field Coupling

Tunable Fiber Bragg Grating Using Evanescent Field Coupling
Author : Jae-yoon Jeong
Publisher : Unknown
Release Date : 2001
Category :
Total pages :264
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In this work, we present experimental results on tenability of fiber Bragg grating incorporating evanescent field coupling. Evanescent field is the exponentially decaying part of an optical mode formed in a waveguide. A section of fiber with a Bragg grating written in it is side-polished until most of the cladding is removed. The evanescent field is modified by applying different index matching oil and by placing a dielectric material on the polished area of the fiber. A tunability as much as 5 nm was demonstrated as the applied index matching oil varied from n = 1.40 to n = 1.45. Polarization dependent behavior of the device was also measured and it was found out that the polarization component that is perpendicular to the polished surface experiences severe loss. A prototype tunable grating device incorporating a MEMS structure is also discussed.

Comparison of Resistance-based Strain Gauges and Fiber Bragg Gratings in the Presence of Electromagnetic Interference Emitted from an Electric Motor

Comparison of Resistance-based Strain Gauges and Fiber Bragg Gratings in the Presence of Electromagnetic Interference Emitted from an Electric Motor
Author : Douglas Keller (jr.)
Publisher : Unknown
Release Date : 2018
Category : Bragg gratings
Total pages :102
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This thesis reports a performance analysis of resistance based strain gauges and fiber optic fiber Bragg gratings in an environment contaminated by high levels of electromagnetic interference. The obtained results are directly applicable to the development of aerospace vehicles propelled by electrical motors. An area of importance in this relatively new technology is characterizing the mechanical loadings coming off a propulsion device in a stationary setup. This characterization is usually accomplished through the utilization of load cells. The majority of the load cells used in such an application are based on measurements acquired through resistance strain gauges. However, electric motors are known to radiate electromagnetic interference (EMI), which in the case of brushless DC motors is pulsing, alternating, square waves. This EMI severely degrades the signal produced by the resistance strain gauge. This degradation is due to the gauge's metallic construction, acting as an antenna for the EMI. To evaluate the performance of alternative strain measuring methods, a load cell implementing both the resistance strain gauge and fiber Bragg grating sensor, the latter of which is immune to EMI, was designed as a test article. The load cell was calibrated and demonstrated a thrust load sensitivity of 1.93 ±0.04 lbf through the strain gauge system and 0.56 ±0.56 lbf through the fiber Bragg grating system. The device was subjected to both mechanical loading and EMI to quantify the effect of the EMI on the resistance strain gauge. Testing of the device included operating a brushless DC motor, with a coupled flywheel, attached to the load cell at a range of angular velocities from 500 to 2400 RPM. During laboratory testing the resistance strain gauge signal exhibited an important amount of signal spikes and electrical noise, introduced by the EMI contamination; the fiber Bragg grating did not. The spikes increased linearly with the speed of the motor. The electrical noise required bandpass filtering to extract the mechanical signal, which was obtained without noise in the fiber Bragg grating signal. The resistance strain gauge signal, at a maximum, had a signal to noise ratio of 0.0443; the fiber Bragg grating signal, at a minimum, had a signal to noise ratio of 2.0114. These results demonstrated the fiber Bragg grating is more applicable in an EMI contaminated environment.

New Trends in Computer Networks

New Trends in Computer Networks
Author : Tuna Tuğcu,M Ufuk Çağlayan,Fatih Alagöz,Erol Gelenbe
Publisher : World Scientific
Release Date : 2005-09-26
Category : Computers
Total pages :404
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This book presents a selective collection of papers from the 20th International Symposium on Computer and Information Sciences, held in Istanbul, Turkey. The selected papers span a wide spectrum of topics in computer networks, including internet and multimedia, security and cryptography, wireless networks, parallel and distributed computing, and performance evaluation. These papers represent the results of the latest research of academicians from more than 30 countries. Contents:A Lightweight Passive Replication Protocol for Deterministic Serves (J Ahn)A Fair Bandwidth Allocation Scheme for Multimedia Handoff Calls in Cellular Networks (M Salamah & I Candan)Characterizing Voice and Video Traffic Behavior over the Internet (P Calyam & C-G Lee)A Path Restoration Algorithm Sharing the Resource in GMPLS Network (T-M Han et al.)More Efficient Java RMI for GPRS Devices (J Kawash et al.)Cluster-Based Security Mechanism for Sensor Network Communication (I Doh et al.)Performance Considerations for Elliptic Curve Cryptography in Communications (O O Bozkurt)A Dynamic Route Optimization to Support Network Mobility by Using HMNR Scheme (M-S Jeong et al.)Performance Analysis of Reliable Multicast Protocols (C Celik & C F Bazlamacci)A New Algorithm for Horizontal Handover Management in Wireless Mobile Networks (A Tuysuz & M Yildirim)and other papers Readership: Graduate students, academics and researchers in the field of computer networks and telecommunications. Keywords:Computer Networks;Wireless Systems;Quality of Service (QoS);Internet and Multimedia;Parallel and Distributed Computing;Performance Evaluation

Optical Sensors

Optical Sensors
Author : Moh Yasin,Sulaiman Wadi Harun,Hamzah Arof
Publisher : BoD – Books on Demand
Release Date : 2014-03-19
Category : Technology & Engineering
Total pages :240
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This book is a compilation of works presenting recent developments and practical applications in optical sensor technology. It contains 10 chapters that encompass contributions from various individuals and research groups working in the area of optical sensing. It provides the reader with a broad overview and sampling of the innovative research on optical sensors in the world.

Optical Fiber Sensor Technology

Optical Fiber Sensor Technology
Author : K. T. V. Grattan,L.S. Grattan,B. T. Meggitt
Publisher : Springer Science & Business Media
Release Date : 2000-09-30
Category : Science
Total pages :385
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Optical Fiber Sensor Technology, Advanced Applications - Bragg Gratings and Distributed Sensors, builds upon the foundations of the subject in the preceding four volumes of this series, concentrating as they do upon both applications and the technology of advanced optical fiber sensors. Previous volumes have covered the fundamentals of the field, devices and systems and chemical and environmental monitoring. This volume deals with a range of highly topical sensor devices and commercial systems, with considerable emphasis upon one of the most important areas, Bragg gratings in fibers, their fabrication and applications in advanced sensor systems and the principles and use of distributed fiber optic sensors. The volume is well illustrated and referenced, pointing to hundreds of key publications accessible in the open literature. It draws upon a group of authors with an international reputation for their work in the area, carefully edited into a coherent and logical text by the editors, based on their considerable experience in the field. This book series will provide an invaluable source for researchers, engineers and advanced students in the field of optical fibers, optoelectronics and measurement and sensing.

The Construction and Computational Modeling of a Fiber Bragg Grating Tunable Laser Diode

The Construction and Computational Modeling of a Fiber Bragg Grating Tunable Laser Diode
Author : Michele W. Winz
Publisher : Unknown
Release Date : 2003
Category : Diodes
Total pages :188
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The widespread adoption of wavelength division multiplexing to increase the bandwidth of optical fiber communication systems has provided a major impetus for research on low cost, single-mode, wavelength stable tunable diode lasers for use in optical telecommunications due to the large volume of lasers required. Other applications, such as demodulation of fiber Bragg grating sensor systems can also make use of inexpensive tunable laser diodes. In addition, the steady increase in the amount of computational power available has led to the widespread use of computers to model physical systems both to predict system performance and to gain insight into physical behavior. Following a brief review of the application and construction of optical fiber Bragg gratings and a discussion of diode lasers and common methods of tuning diode laser wavelengths, a coupled-cavity approach to modeling laser diode output spectra, the construction of a fiber Bragg grating wavelength tunable laser, and the coupled cavity model of the fiber Bragg grating wavelength tunable diode laser are detailed. The physical laser system consists of a commercial Fabry-Perot diode laser with a cavity length of 300 microns, antireflection coated with a single layer of SiO, and coupled into an optical fiber containing a fiber Bragg grating. Wavelength tuning is accomplished by applying axial strain to the fiber grating. The coupled cavity model directly includes the antireflection coating, includes the fiber Bragg grating as an index step, and is the first reported implementation of this method to model fiber Bragg grating coupled laser diodes. The measured output spectra of the physical laser diode system and the calculated output spectra are given and compared. Continuous tuning of the diode laser by applying axial strain to the fiber grating is not observed nor calculated to occur for a single-layer silicon monoxide antireflection coating. To achieve continuous wavelength tuning, better antireflection coatings will need to be developed.