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Raman Kashyap - One of the best experts on this subject based on the ideXlab platform.
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Fiber Bragg Gratings for low-temperature measurement
Optics Express, 2014Co-Authors: Elton Soares De Lima Filho, Mohamad Diaa Baiad, Mathieu Gagné, Raman KashyapAbstract:We demonstrate the use of fiber Bragg Gratings (FBGs) as a monolithic temperature sensor from ambient to liquid nitrogen temperatures, without the use of any auxiliary embedding structure. The Bragg Gratings, fabricated in three different types of fibers and characterized with a high density of points, confirm a nonlinear thermal sensitivity of the fibers. With a conventional interrogation scheme it is possible to have a resolution of 0.5 K for weak pure-silica-core FBGs and 0.25 K using both boron-doped and germanium-doped standard fibers at 77 K. We quantitatively show for the first time that the nonlinear thermal sensitivity of the FBG arises from the nonlinearity of both thermo-optic and thermal expansion coefficients, allowing consistent modeling of FBGs at low temperatures.
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Fiber Bragg Gratings
Fiber Bragg Gratings, 2010Co-Authors: Raman KashyapAbstract: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 cole Polytechnique, University of Montr al 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. © 2010 Elsevier Inc. All rights reserved.
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fiber Bragg Gratings
1999Co-Authors: Raman KashyapAbstract:* 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 cole Polytechnique, University of Montr al 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.
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Chirped Fibre Bragg Gratings for WDM Applications
Optical Amplifiers and Their Applications, 1997Co-Authors: Raman KashyapAbstract:Fibre Bragg Gratings are finding ever-increasing applications in telecommunications. The paper presents some of the recent applications of Bragg Gratings for WDM systems and the prospects for future developments.
David F. Geraghty - One of the best experts on this subject based on the ideXlab platform.
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Study of Multichannel Parallel Anti-Symmetric Waveguide Bragg Gratings for Telecom Applications
IEEE Photonics Technology Letters, 2007Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. GeraghtyAbstract:We theoretically demonstrate the viability of parallel anti-symmetric waveguide Bragg Gratings within a two-mode waveguide. These Gratings produce reflections with mode conversions. This is the functional equivalent of superimposed Bragg Gratings in silica-on-silicon without requiring multilevel etches. Also, due to their weaker coupling constant, these Gratings allow for devices with narrow spectral full-width at half-maximum that can process multiple wavelength channels for applications such as optical add-drop multiplexers and optical encoders in optical communication systems
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Parallel Anti-Symmetric Waveguide Bragg Gratings
Frontiers in Optics, 2006Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. GeraghtyAbstract:We theoretically demonstrate parallel anti-symmetric waveguide Bragg Gratings within a two-mode waveguide with mode conversions. This is the functional equivalent of superimposed Bragg Gratings in silica-on-silicon without requiring multi-level etches.
Jose E. Castillo - One of the best experts on this subject based on the ideXlab platform.
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Study of Multichannel Parallel Anti-Symmetric Waveguide Bragg Gratings for Telecom Applications
IEEE Photonics Technology Letters, 2007Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. GeraghtyAbstract:We theoretically demonstrate the viability of parallel anti-symmetric waveguide Bragg Gratings within a two-mode waveguide. These Gratings produce reflections with mode conversions. This is the functional equivalent of superimposed Bragg Gratings in silica-on-silicon without requiring multilevel etches. Also, due to their weaker coupling constant, these Gratings allow for devices with narrow spectral full-width at half-maximum that can process multiple wavelength channels for applications such as optical add-drop multiplexers and optical encoders in optical communication systems
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Parallel Anti-Symmetric Waveguide Bragg Gratings
Frontiers in Optics, 2006Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. GeraghtyAbstract:We theoretically demonstrate parallel anti-symmetric waveguide Bragg Gratings within a two-mode waveguide with mode conversions. This is the functional equivalent of superimposed Bragg Gratings in silica-on-silicon without requiring multi-level etches.
Gang-ding Peng - One of the best experts on this subject based on the ideXlab platform.
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Etched polymer fibre Bragg Gratings
Photonics and Fiber Technology 2016 (ACOFT BGPP NP), 2016Co-Authors: Kishore Bhowmik, Eliathamby Ambikairajah, Gang-ding Peng, Ginu RajanAbstract:Recently we initiated a new research direction for high-sensitivity and high-reflectivity Bragg grating fabrication based on etched polymer optical fibre, here we report the recent research developments on etched polymer fibre Bragg Gratings.
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Polymer fibre Bragg Gratings and sensing
Sensors, 2015Co-Authors: Gang-ding Peng, Kishore Bhowmik, Ginu Rajan, Eliathamby Ambikairajah, David J. WebbAbstract:Polymer FBGs have advantages for sensing because of low Young's modulus, high temperature sensitivity, large strain range and so on. They are attractive for many niche applications such as structural health monitoring of composite materials, biochemical and biomedical sensing. While polymer FBGs have been developed for some time, polymer microfibre Bragg Gratings are developed only recently and have shown to introduce some interesting features, e.g. increased pressure sensitivity to pressure / force and improved response time to humidity. We will report and discuss the recent work on polymer FBG and polymer microfibre Bragg Gratings as well as their applications such as accelerometer, humidity sensor and force and pressure sensor. © 2015 OSA.
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Tensile strain characterization of polymer optical fibre Bragg Gratings
Optics Communications, 2005Co-Authors: Gang-ding PengAbstract:The systematic investigation on the tensile strain characterization of polymer optical fibre Bragg Gratings is reported in this paper. Experimental results indicate that a very large Bragg wavelength tuning range (32 nm) with good reproducibility, reversibility and repeatability can be achieved by applying the simple tension on polymer fibre Bragg Gratings. It is also demonstrated that the strain sensitivity of polymer fibre Bragg Gratings is larger than that of silica fibre Bragg Gratings. As a result, the strain characterization study shows the great potential of polymer fibre Bragg Gratings in both WDM optical communications and fibre strain sensing applications.
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Strain sensing characterization of polymer optical fibre Bragg Gratings
17th International Conference on Optical Fibre Sensors, 2005Co-Authors: Gang-ding PengAbstract:Static tensile strain is applied to polymer optical fibre Bragg Gratings for the strain sensing characterization. Experimental results indicate that the strain coefficient of polymer fibre Bragg Gratings is larger than that of silica fibre Bragg Gratings. It is also demonstrated the large strain sensing range with good reproducibility, reversibility and repeatability is achieved. As a result, the study shows the great potential of polymer fibre Bragg Gratings in the fibre strain sensing applications.
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Polymer fiber Bragg Gratings tunable dispersion compensation
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Gang-ding Peng, T.w. WhitbreadAbstract:We propose a new scheme for tunable dispersion with a large tuning range and a fixed center wavelength using linearly chirped polymer fiber Bragg Gratings. Simple tension and uniform heating are employed as the control process.
Hau Ping Chan - One of the best experts on this subject based on the ideXlab platform.
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Polarization‐insensitive polymer waveguide Bragg Gratings
Microwave and Optical Technology Letters, 2020Co-Authors: Sin Yip Cheng, Kin Seng Chiang, Hau Ping ChanAbstract:We report the design and fabrication of Bragg Gratings in benzocyclobutene (BCB) channel waveguides with emphasis on the demonstration of their polarization dependence. The effects of the stress-induced birefringence in the waveguide on the polarization dependence of the Bragg Gratings are characterized and discussed. Our results show the possibility of realizing tunable polarization-insensitive Bragg-grating filters with simple polymer waveguide structures. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 334–338, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21342
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Phase-Shifted Fiber Bragg Gratings for Terahertz Range
IEEE Photonics Technology Letters, 2012Co-Authors: Shu Fan Zhou, Laurence Reekie, Yuk Tak Chow, Hau Ping ChanAbstract:We demonstrate notch filters in polymer fiber Bragg Gratings for use at THz frequencies. The filters were created by introducing a π/2-phase shift into narrowband Bragg Gratings manufactured in Topas polymer subwavelength fiber. Experimental results are presented and compared with a model of the filter. Excess resonator loss of the notch filter is discussed.
