Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Phase Bias Independent Fade-free Optical Fiber Interferometric Vibration Sensor

  • Youngwoong Kim (Nuclear System Integrity Sensing and Diagnosis Division, Korea Atomic Energy Research Institute) ;
  • Jongyeol Kim (Nuclear System Integrity Sensing and Diagnosis Division, Korea Atomic Energy Research Institute) ;
  • Younggwan Hwang (Nuclear System Integrity Sensing and Diagnosis Division, Korea Atomic Energy Research Institute) ;
  • Gukbeen Ryu (Nuclear System Integrity Sensing and Diagnosis Division, Korea Atomic Energy Research Institute) ;
  • Young Ho Kim (Optical Precision Measurement Research Center, Korea Photonics Technology Institute) ;
  • Myoung Jin Kim (Optical Precision Measurement Research Center, Korea Photonics Technology Institute)
  • Received : 2024.05.29
  • Accepted : 2024.07.29
  • Published : 2024.10.25
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Abstract

We propose a novel fade-free optical fiber interferometric vibration sensor using a simple setup with a 90° optical hybrid. The interferometer consists of all-optical components without the phase modulators and complex demodulation processes that were previously used to compensate for signal fading induced by phase bias change. Fade-free output was successfully obtained by in-phase and quadrature detection with a π/2 phase shifting scheme. Theoretical analysis and measurement results showed that the proposed interferometric vibration sensor operates independently of the phase bias state of interfering waves.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) funded by the Korean government (Ministry of Science and ICT) (Grant No. RS-2022-00144110 & RS-2023-00258052).

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