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Help with FBG Bragg Wavelength

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(joined August 2020)
Participant

I’m working on a FBG pressure sensor design.
I want to know if the Bragg wavelength of the FBG keep increasing indefinitely, (ofcourse till the strain doesn’t break it) or is there a range through which the Bragg wavelength increases and then stops increasing.

Responses (4):

    • #67899
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      Anant Mantha
      Participant

      I’m working on a FBG pressure sensor design.
      I want to know if the Bragg wavelength of the FBG keep increasing indefinitely, (ofcourse till the strain doesn’t break it) or is there a range through which the Bragg wavelength increases and then stops increasing.

    • #67903
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      Ahmad Atieh
      Moderator

      Hello Anant,
      The stress/strain parameters in the FBG sensor are set by the user in a range that the simulation allows (please refer to the component datasheet). The drift in the FBG center wavelength will respond to these ranges. You need to make sure that you use reasonable values to represent practical implementation.
      Regards,
      Ahmad

    • #67918
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      Anant Mantha
      Participant

      Hi Ahmed
      Thanks for help. I actually wanted to know what happens in case of hardware implementation. Is the bragg wavelegth a constrained property of a physical FBG or it keeps increasing along with strain.
      TIA

    • #67919
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      Ahmad Atieh
      Moderator

      Dear TIA,
      Physically, the FBG center wavelength will drift with increase the strain to a level that the grating broke or doesn’t allow light propagating in the fiber.
      Are you able to make experiments on FBGs? I am interested in the experimental results and validation of the model!
      you may contact me at ahmad.atieh@optiwave.com
      Ahmad

    • #67924
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      Anant Mantha
      Participant

      Hi Ahmed

      Thanks for your answer. I have contacted you via the email you have provided, kndly check. Also if you are willing i shall send you my project report from my final year college project as you were interesting in experimental validation. We had done a small experiment but only used the bare FBG Fibre and not the Actual sensor. It was a proof of concept.

      regards
      Anant

      • This reply was modified 1 year, 1 month ago by Anant Mantha.

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