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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Writing Bragg Gratings in Multicore Fibers
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Remote picometer fiber Bragg grating demodulation using a dual-wavelength source.

Juan Clement, Germán Torregrosa, Haroldo Maestre

    Applied Optics
    |August 19, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new method for remote fiber Bragg grating (FBG) sensing using a dual-wavelength source. This technique achieves picometer resolution for detecting wavelength shifts, matching commercial interrogator performance.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Signal Processing

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for point sensing applications.
    • Traditional FBG interrogation methods often require complex setups or have limitations in remote sensing.
    • Developing robust and cost-effective remote interrogation techniques is crucial for expanding FBG sensor applications.

    Purpose of the Study:

    • To demonstrate a self-referenced, intensity-based, remote, and passive interrogation method for FBGs.
    • To evaluate the performance of this new technique compared to conventional methods and commercial interrogators.
    • To identify the limitations of the proposed interrogation scheme.

    Main Methods:

    • Utilized a reconfigurable dual-wavelength source with tunable wavelength and suppressed-carrier electro-optic amplitude modulation.
    • Employed a demodulation procedure based on measuring reflected power at two distinct wavelengths within the FBG's spectral response.
    • Interrogated the FBG using both conventional spectral analysis and a dispersive incoherent optical Fourier-domain reflectometry technique over 32.9 km of single-mode fiber.

    Main Results:

    • Achieved picometer resolution in Bragg wavelength shift determination with a scan time of approximately 1 second and a received power of -16 dBm.
    • Demonstrated comparable performance between the new technique and conventional spectral analysis, even over long fiber distances.
    • Identified the primary limitations inherent in each interrogation scheme.

    Conclusions:

    • The proposed self-referenced, intensity-based interrogation method is feasible for remote FBG sensing.
    • This technique offers performance comparable to commercial FBG interrogators.
    • The use of simple frequency combs at a calibrated, reconfigurable wavelength grid shows promise for future FBG interrogation systems.