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Bragg Gratings

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Raman Kashyap – 1st expert on this subject based on the ideXlab platform

  • Fiber Bragg Gratings for low-temperature measurement
    Optics Express, 2014
    Co-Authors: Elton Soares De Lima Filho, Mohamad Diaa Baiad, Mathieu Gagné, Raman Kashyap

    Abstract:

    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.

  • Fiber Bragg Gratings
    Fiber Bragg Gratings, 2010
    Co-Authors: Raman Kashyap

    Abstract:

    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.

  • fiber Bragg Gratings
    , 1999
    Co-Authors: Raman Kashyap

    Abstract:

    * 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.

David F. Geraghty – 2nd expert on this subject based on the ideXlab platform

  • Study of Multichannel Parallel Anti-Symmetric Waveguide Bragg Gratings for Telecom Applications
    IEEE Photonics Technology Letters, 2007
    Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. Geraghty

    Abstract:

    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

  • Parallel Anti-Symmetric Waveguide Bragg Gratings
    Frontiers in Optics, 2006
    Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. Geraghty

    Abstract:

    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 – 3rd expert on this subject based on the ideXlab platform

  • Study of Multichannel Parallel Anti-Symmetric Waveguide Bragg Gratings for Telecom Applications
    IEEE Photonics Technology Letters, 2007
    Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. Geraghty

    Abstract:

    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

  • Parallel Anti-Symmetric Waveguide Bragg Gratings
    Frontiers in Optics, 2006
    Co-Authors: Jose E. Castillo, Jose M. Castro, Raymond K. Kostuk, David F. Geraghty

    Abstract:

    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.