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Fiber Vector Bend Sensor Based on Multimode Interference and Image Tapping.

Ziyang Zhang1,2, Aashia Rahman3, Julia Fiebrandt4,5

  • 1School of Engineering, Westlake University, 18 Shilongshan Road, Hangzhou 310024, China. zhangziyang@westlake.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a novel fiber optic sensor for detecting fiber bends. It precisely measures bend radius and direction by analyzing light intensity changes, enabling advanced sensing applications.

Keywords:
bend sensorsfiber imagingfiber sensorsmultimode interference

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Area of Science:

  • Optoelectronics and Photonics
  • Fiber Optic Sensing Technology
  • Interferometry and Wave Phenomena

Background:

  • Traditional fiber bend sensors often rely on complex grating structures or imaging processing.
  • Multimode interference (MMI) devices offer potential for simplified optical sensing.
  • Accurate and directional bend sensing is crucial for various industrial and medical applications.

Purpose of the Study:

  • To demonstrate a grating-less fiber vector bend sensor.
  • To develop a method for determining both the bend radius and direction using MMI.
  • To simplify the analysis of bend-induced light distribution changes.

Main Methods:

  • A standard single-mode fiber was spliced to a multimode fiber to create an MMI device.
  • A seven-core fiber was spliced to the MMI device to tap out light intensity distribution.
  • Relative light intensities from seven output single-mode fibers were compared to determine bend parameters.

Main Results:

  • The sensor successfully detected bend direction and radius without complex imaging.
  • A 10 µm bend displacement in the X-direction caused a 4.6 dB power imbalance between outputs C4 and C7.
  • A similar displacement in the Y-direction resulted in a 7.0 dB imbalance between outputs C3 and C4, while C4/C7 remained constant.

Conclusions:

  • The demonstrated grating-less fiber vector bend sensor effectively utilizes multimode interference.
  • The seven-core fiber readout simplifies bend analysis, enabling determination of both radius and direction.
  • This technology offers a promising approach for high-sensitivity, directional fiber optic sensing.