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Writing Bragg Gratings in Multicore Fibers
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Vernier effect using in-line highly coupled multicore fibers.

Natanael Cuando-Espitia1, Miguel A Fuentes-Fuentes2, Amado Velázquez-Benítez3

  • 1CONACyT, Applied Physics Group, DICIS, University of Guanajuato, 368850, Salamanca, Guanajuato, Mexico. natanael.cuando@ugto.mx.

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We developed highly sensitive optical fiber sensors using multicore fibers and the optical Vernier effect. This novel sensor design significantly enhances temperature measurement sensitivity, offering a versatile platform for various applications.

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensing
  • Applied Physics

Background:

  • Optical fiber sensors are crucial for various applications.
  • Enhancing sensor sensitivity is a key research objective.
  • The optical Vernier effect offers a method for signal amplification.

Purpose of the Study:

  • To demonstrate optical fiber sensors utilizing the optical Vernier effect with highly coupled multicore fibers.
  • To evaluate the performance and sensitivity enhancement of these sensors.
  • To provide guidelines for constructing optimized fiber-based Vernier sensors.

Main Methods:

  • Fabrication of a sensor device using single-mode fibers (SMFs) and a seven-core fiber (SCF) segment.
  • Implementation of the optical Vernier effect within the SMF-SCF-SMF configuration.
  • Experimental evaluation of temperature sensing sensitivity and theoretical analysis for parameter optimization.

Main Results:

  • The SMF-SCF-SMF device serves as a versatile building block for reflection and transmission sensors.
  • A ten-fold increase in sensitivity for temperature measurements was achieved compared to conventional devices.
  • Theoretical analysis identified key parameters for optimizing sensor sensitivity.

Conclusions:

  • Highly coupled multicore fibers combined with the optical Vernier effect enable the development of highly sensitive fiber sensors.
  • The demonstrated SMF-SCF-SMF sensor design is easily fabricated and adaptable.
  • This work provides a framework for designing advanced fiber optic sensors for diverse applications.