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Random optical parametric oscillator fibre sensor.

Pedro Tovar1, Jean Pierre von der Weid2, Yuan Wang3

  • 1Nexus for Quantum Technologies, University of Ottawa, Ottawa Rio de Janeiro, ON, Canada. ptovar@opto.cetuc.puc-rio.br.

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Summary
This summary is machine-generated.

This study introduces a novel random optical parametric oscillator (R-OPO) fiber sensor for long-distance sensing. This new fiber sensor technology eliminates the need for fixed mirrors and allows for electronically tunable sensing locations, overcoming key limitations of existing fiber sensors.

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Area of Science:

  • Optoelectronics and Photonics
  • Fiber Optic Sensing Technology
  • Nonlinear Optics

Background:

  • Traditional fiber laser-sensors require fixed mirrors or access to both fiber ends, limiting their practical application for long-distance sensing.
  • Existing fiber sensing methods face challenges in spatial resolution, signal-to-noise ratio (SNR), and flexibility in selecting sensing locations.
  • The need for advanced fiber sensing solutions that overcome distance and accessibility constraints is critical for various monitoring applications.

Purpose of the Study:

  • To introduce and demonstrate a novel random optical parametric oscillator (R-OPO) fiber sensor.
  • To overcome the limitations of conventional fiber sensors by enabling long-distance sensing with electronically tunable locations.
  • To showcase the R-OPO sensor's capability for real-time quantitative measurement of dynamic perturbations.

Main Methods:

  • Development of a random optical parametric oscillator (R-OPO) fiber sensor system.
  • Exploitation of modulation instability and continuous weak reflections for sensing.
  • Utilizing a single fast Fourier transform for quantitative measurement of dynamic perturbations.

Main Results:

  • Achieved long-distance sensing capability (>25 km) with arbitrary addressing of 1m-long fiber sections (>1 km range).
  • Demonstrated electronically tunable sensing locations without the need for fixed mirrors.
  • Obtained noise-limited sensitivities of 10.73 μ°C/√Hz for temperature and 80.6 με/√Hz for strain.
  • Enhanced sensitivity to external perturbations by a factor of two compared to conventional Rayleigh-based sensors.
  • Successfully monitored a 2°C temperature increase in real-time using a frequency-unwrapping algorithm.

Conclusions:

  • The random optical parametric oscillator (R-OPO) fiber sensor offers a significant advancement over existing technologies.
  • This technology overcomes critical limitations, enabling flexible, long-distance, and real-time fiber optic sensing.
  • The demonstrated R-OPO fiber sensor lays the foundation for future parametric fiber sensing applications.