Section outline

  • In this video, Kristina Skarvang Vaskinn demonstrates how State of Polarization (SOP) changes in optical fibers can be used for event detection, particularly earthquake monitoring, using both Full-Stokes and PBS-based polarimeters. She also provides real-world example of detecting an earthquake using SOP data.

    Watch this video to discover that:
    • PBS systems show high sensitivity to earthquake signals, so even small changes in SOP provide valuable insights to detect environmental events like earthquakes;
    • Stokes-based and PBS-based methods align well when proper filters were applied, therefore:
      • Filters are essential for separating different types of events;
      • Integration of different sensing tools enhances signal clarity and detection robustness.
    • Simple implementation makes SOP sensing scalable and globally viable.

    • Analysing State of Polarization (SOP) Data​ for earthquake monitoring File

      Content covered in the presentation

      1. State-of-Polarisation (SoP) definition [05:54]
      2. Measurement Methods
        • Full-Stokes Polarimeter (e.g., PM1000) [07:17]
        • PBS-based Polarimeter [10:10]
      3. Case Study: Earthquake Detection [12:58]
        • Analysing Earthquakes with Full-Stokes polarimeter [14:12]
        • Analysing Earthquakes with PBS polarimeter [16:11]
      4. Data Analysis Techniques
        •  Frequency & Time Analysis [19:02]
        • Multiple events on the same cable [19:55]
        • RMS Plots (Root Mean Square) [21:06]
      5. Answers to audience questions [27:50]