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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Multimode interference tapered fiber refractive index sensors.

Claudecir R Biazoli1, Susana Silva, Marcos A R Franco

  • 1Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas—UNICAMP, Campinas, São Paulo, Brazil.

Applied Optics
|August 22, 2012
PubMed
Summary

This study presents a novel method for fabricating tapered multimode-interference fiber structures with high signal transmittance. The developed fiber optic sensor demonstrates high sensitivity for refractive index sensing applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optic Sensing
  • Materials Science

Background:

  • Multimode interference (MMI) based fiber structures offer unique optical properties.
  • Fabricating MMI devices with controlled parameters is crucial for high performance.
  • Existing methods face challenges with splice fragility and alignment control.

Purpose of the Study:

  • To develop a real-time monitoring method for fabricating tapered MMI fiber structures.
  • To achieve high signal transmittance through controlled tapering of multimode fiber.
  • To demonstrate the sensing capabilities of the fabricated fiber structure.

Main Methods:

  • Utilized a pure silica multimode fiber (MMF) spliced between single-mode fibers.
  • Employed a tapering process with adjustable parameters for controlled diameter reduction.
  • Real-time monitoring was integrated into the fabrication process.
  • Characterized the optical transmittance and refractive index sensitivity.

Main Results:

  • Successfully fabricated tapered MMI fiber structures with waist diameters as low as 55 μm.
  • Achieved high signal transmittance due to constructive interference of guided modes.
  • Demonstrated ease of fabrication without fragile splices or alignment issues.
  • Attained a maximum sensitivity of 2946 nm/refractive index unit in the 1.42-1.43 RI range.

Conclusions:

  • The developed real-time monitoring and fabrication process enables efficient production of high-performance tapered MMI fiber sensors.
  • The fabricated sensors exhibit excellent sensitivity to external refractive index changes.
  • This technology holds promise for advanced optical sensing applications.