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Bragg Wavelength

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Stephen F Collins – 1st expert on this subject based on the ideXlab platform

  • Optical fibre Bragg gratings at harmonics of the Bragg Wavelength and their sensing properties
    Measurement Science and Technology, 2013
    Co-Authors: Stephen F Collins, Scott A Wade, Fotios Sidiroglou, Greg W. Baxter

    Abstract:

    Spectral features in optical fibre Bragg gratings (FBGs) at various harmonics of the Bragg Wavelength arise due to saturation of the writing process. Additionally, phase-mask-produced FBGs possess a complex refractive index pattern, producing an extra periodicity equal to the phase-mask periodicity that supplements the desired periodicity of half that of the phase-mask, as shown via differential interference contrast microscopy. Some spectral peaks or dips occur as doublets with a Wavelength spacing that depends upon fibre alignment relative to the phase mask. These spectral properties are of importance, as they allow the realization of alternative FBG sensors of various measurands.

  • Understanding fiber Bragg gratings at harmonics of the Bragg Wavelength through spectra and images
    OFS2012 22nd International Conference on Optical Fiber Sensors, 2012
    Co-Authors: Stephen F Collins, Scott A Wade, Fotios Sidiroglou, Greg W. Baxter

    Abstract:

    Fiber Bragg gratings written using a phase-mask exhibit a complex refractive index pattern in the fiber core,
    as observed in differential interference contrast (DIC) microscopy. This results in dual periodicities along the
    fiber core and gratings at both the Bragg Wavelength, twice the Bragg Wavelength, and the harmonics of these.
    Features in grating spectra arise from one or both of these periodicities and spectra for twice the Bragg
    Wavelength (or its odd harmonics) are very sensitive to the details of how the UV complex diffraction field of
    the phase mask becomes imprinted as refractive index changes in the fiber core.

  • Effect of phase mask alignment on fiber Bragg grating spectra at harmonics of the Bragg Wavelength
    Journal of The Optical Society of America A-optics Image Science and Vision, 2012
    Co-Authors: Scott A Wade, Gregory W Baxter, Fotios Sidiroglou, William G. A. Brown, Stephen F Collins

    Abstract:

    Effects of fabrication conditions on the double-peak structure observed in fiber Bragg gratings at harmonics of the Bragg Wavelength were investigated, showing that slight variations in the alignment of the phase mask can affect the grating spectra significantly. A single peak occurs only when the incident beam direction is perfectly normal with respect to the fiber.

Kazuo Hotate – 2nd expert on this subject based on the ideXlab platform

  • Measurement of BraggWavelength Distribution in a Long-Length Fiber Bragg Grating with High Speed Sampling
    Applied Physics Express, 2009
    Co-Authors: Koji Kajiwara, Kazuo Hotate

    Abstract:

    We have performed a measurement of Bragg Wavelength distribution in a long-length fiber Bragg grating (FBG) with kHz order sampling rate. We have also realized the total distribution measurement with a repetition rate faster than 1 Hz. The proposed sensing system is based on a reflectometry technique “synthesis of optical coherence function”. The advantage of this system is the capability of random access distributed measurement and fast speed interrogation. At two points of a long-length FBG, we have performed the reflection spectrum variation measurement when an 80 Hz vibration is applied to part of the FBG.

  • Measurement of Bragg Wavelength distribution in a long-length fiber Bragg grating by synthesis of optical coherence function
    19th International Conference on Optical Fibre Sensors, 2008
    Co-Authors: Kazuo Hotate, Koji Kajiwara

    Abstract:

    A sensor system for measuring continuous Bragg Wavelength distribution in a long-length fiber Bragg grating is newly
    proposed and implemented, based on the technique of synthesis of optical coherence function. Experimental results and
    simulations are comparatively examined.

  • Proposal and experimental verification of Bragg Wavelength distribution measurement within a long-length FBG by synthesis of optical coherence function.
    Optics express, 2008
    Co-Authors: Kazuo Hotate, Koji Kajiwara

    Abstract:

    In this paper, a sensor system for measuring continuous Bragg Wavelength distribution in a long-length fiber Bragg grating is newly proposed, using synthesis of optical coherence function (SOCF), which is one of the spatial resolving techniques used for reflectometry. Experimental results are also reported. In the process of synthesizing optical coherence function, it is found that an apodization scheme is necessary to obtain the reflection spectrum of local section in a long-length FBG around the coherence peak. As a verification of this method, the detection of local Bragg Wavelength shift due to temperature change within a short section in a long-length FBG is demonstrated experimentally.

Scott A Wade – 3rd expert on this subject based on the ideXlab platform

  • Optical fibre Bragg gratings at harmonics of the Bragg Wavelength and their sensing properties
    Measurement Science and Technology, 2013
    Co-Authors: Stephen F Collins, Scott A Wade, Fotios Sidiroglou, Greg W. Baxter

    Abstract:

    Spectral features in optical fibre Bragg gratings (FBGs) at various harmonics of the Bragg Wavelength arise due to saturation of the writing process. Additionally, phase-mask-produced FBGs possess a complex refractive index pattern, producing an extra periodicity equal to the phase-mask periodicity that supplements the desired periodicity of half that of the phase-mask, as shown via differential interference contrast microscopy. Some spectral peaks or dips occur as doublets with a Wavelength spacing that depends upon fibre alignment relative to the phase mask. These spectral properties are of importance, as they allow the realization of alternative FBG sensors of various measurands.

  • Understanding fiber Bragg gratings at harmonics of the Bragg Wavelength through spectra and images
    OFS2012 22nd International Conference on Optical Fiber Sensors, 2012
    Co-Authors: Stephen F Collins, Scott A Wade, Fotios Sidiroglou, Greg W. Baxter

    Abstract:

    Fiber Bragg gratings written using a phase-mask exhibit a complex refractive index pattern in the fiber core,
    as observed in differential interference contrast (DIC) microscopy. This results in dual periodicities along the
    fiber core and gratings at both the Bragg Wavelength, twice the Bragg Wavelength, and the harmonics of these.
    Features in grating spectra arise from one or both of these periodicities and spectra for twice the Bragg
    Wavelength (or its odd harmonics) are very sensitive to the details of how the UV complex diffraction field of
    the phase mask becomes imprinted as refractive index changes in the fiber core.

  • Effect of phase mask alignment on fiber Bragg grating spectra at harmonics of the Bragg Wavelength
    Journal of The Optical Society of America A-optics Image Science and Vision, 2012
    Co-Authors: Scott A Wade, Gregory W Baxter, Fotios Sidiroglou, William G. A. Brown, Stephen F Collins

    Abstract:

    Effects of fabrication conditions on the double-peak structure observed in fiber Bragg gratings at harmonics of the Bragg Wavelength were investigated, showing that slight variations in the alignment of the phase mask can affect the grating spectra significantly. A single peak occurs only when the incident beam direction is perfectly normal with respect to the fiber.