Phase Bias Independent Fade-free Optical Fiber Interferometric Vibration Sensor

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...

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Bibliographic Details
Published in:Current optics and photonics 2024, 8(5), , pp.456-462
Main Authors: Kim, Youngwoong, Kim, Jongyeol, Hwang, Younggwan, Ryu, Gukbeen, Kim, Young Ho, Kim, Myoung Jin
Format: Article
Language:English
Subjects:
Bias
Demodulation
Interferometry
Optical components
Optical fibers
Quadratures
Signal fading
Vibration analysis
Vibration measurement
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Summary: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.
ISSN:2508-7266
2508-7274
DOI:10.3807/COPP.2024.8.5.456