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Temperature cross-sensitivity characteristics of singlemode-multimode-singlemode fiber structure.

Rongxiang Zhang1, Tiegen Liu1, Qun Han1

  • 1College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China and Key Laboratory of Opto-Electronics Information Technical, Tianjin University, Ministry of Education, Tianjin 300072, China.

The Review of Scientific Instruments
|February 2, 2015
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Summary

This study investigates a single-mode-multi-mode-single-mode (SMS) fiber structure for temperature sensing. Researchers found the thermo-optic effect of the multi-mode fiber cladding is the primary factor influencing temperature sensitivity.

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Area of Science:

  • Fiber optics
  • Optical sensing
  • Photonics

Background:

  • Single-mode-multi-mode-single-mode (SMS) fiber structures offer unique optical properties.
  • Understanding temperature cross-sensitivity is crucial for accurate optical sensor deployment.

Purpose of the Study:

  • To theoretically and experimentally investigate the temperature cross-sensitivity of a packaged SMS fiber structure.
  • To identify the dominant factors affecting temperature sensitivity in such structures.

Main Methods:

  • Theoretical modeling of the SMS fiber structure's response to temperature changes.
  • Experimental fabrication and testing of a packaged SMS fiber optic temperature sensor.

Main Results:

  • Theoretical analysis revealed the thermo-optic effect (TOE) of the multi-mode fiber (MMF) cladding as the primary determinant of temperature sensitivity.
  • Thermal expansion effects (TEEs) of the MMF core and packaging material, inducing axial strain, were identified as secondary factors.
  • Experimental results showed a temperature sensitivity of -453.4 pm/°C, aligning well with theoretical predictions.

Conclusions:

  • The packaged SMS fiber structure's temperature sensitivity is predominantly governed by the MMF cladding's thermo-optic effect.
  • The study provides a validated theoretical framework for designing SMS fiber-based temperature sensors.