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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Integrating Radio-Over-Fiber Communication System and BOTDR Sensor System.

Wai Pang Ng1, Nageswara Lalam2, Xuewu Dai1

  • 1Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.

Sensors (Basel, Switzerland)
|April 25, 2020
PubMed
Summary
This summary is machine-generated.

This study integrates radio-over-fiber (RoF) communications with Brillouin optical time-domain reflectometry (BOTDR) sensing on a single fiber. The system achieves low error rates for strain and temperature monitoring, reducing infrastructure costs.

Keywords:
BOTDRdistributed fiber sensorradio-over-fiber (RoF)

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Area of Science:

  • Optoelectronics and Communications
  • Fiber Optic Sensing Technologies

Background:

  • Integrating communication and sensing systems is crucial for cost-effective infrastructure.
  • Radio-over-fiber (RoF) and Brillouin optical time-domain reflectometry (BOTDR) are key technologies in modern networks.

Purpose of the Study:

  • To demonstrate the first integrated RoF and BOTDR system using a single optical fiber.
  • To evaluate the performance of different modulation formats (QPSK, 16-QAM, 64-QAM) within the integrated system.
  • To assess the impact of BOTDR sensing on communication signal quality.

Main Methods:

  • Implemented an RoF system with OFDM signals modulated by QPSK, 16-QAM, and 64-QAM.
  • Utilized a BOTDR system for strain and temperature monitoring over a 25 km fiber link with 5 m spatial resolution.
  • Analyzed error vector magnitude (EVM) for different modulation formats under varying BOTDR pump powers.

Main Results:

  • Achieved low temperature measurement error (±0.49 °C at 25 km).
  • Demonstrated acceptable EVM values within 3GPP requirements using QPSK modulation (3.5% with filter).
  • Optimized sensing and data power levels (18 dBm and 10 dBm, respectively) for QPSK.

Conclusions:

  • The integrated RoF-BOTDR system is feasible and effective for practical applications.
  • Utilizing a single fiber link significantly reduces infrastructure costs.
  • The system offers simultaneous high-performance communication and distributed sensing.