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All-Fiber Laser Curvature Sensor Using an In-Fiber Modal Interferometer Based on a Double Clad Fiber and a Multimode

Ricardo I Álvarez-Tamayo1, Manuel Durán-Sánchez2, Patricia Prieto-Cortés3

  • 1CONACYT-FCFM, Universidad Autónoma de Nuevo León, Av. Universidad S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León 66455, Mexico. rialvarez@conacyt.mx.

Sensors (Basel, Switzerland)
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Summary
This summary is machine-generated.

A new fiber optic curvature sensor uses modal interference for enhanced performance. This robust, low-cost sensor offers simple operation and reliable measurements for various applications.

Keywords:
curvature measurementerbium-doped fiber laserfiber optic laser sensormodal in-fiber interferometer

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Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Laser Technology

Background:

  • Modal interference in optical fibers is a known phenomenon.
  • Fiber optic sensors are crucial for remote and real-time measurements.
  • Erbium-doped fiber lasers are widely used in various laser applications.

Purpose of the Study:

  • To propose and demonstrate an all-fiber curvature laser sensor.
  • To enhance the performance of a modal interference structure for sensing.
  • To improve the spectral quality of an erbium-doped fiber laser using the sensor.

Main Methods:

  • Fabrication of an in-fiber device by fusion splicing multimode fiber and double-clad fiber segments.
  • Utilizing the fabricated device as both a wavelength filter and sensing element.
  • Integrating the modal interferometer into a ring cavity erbium-doped fiber laser.

Main Results:

  • Significantly increased fringe visibility of the filter transmission spectrum.
  • Considerably increased spectral quality factor (Q) of the laser.
  • Demonstrated reliability, robustness, ease of fabrication, low cost, and simple operation of the sensor.

Conclusions:

  • The proposed all-fiber curvature laser sensor based on novel modal interference is effective.
  • The sensor offers significant advantages in performance and practicality.
  • This technology holds promise for advanced curvature sensing applications.