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Orbital Angular Momentum Mode Sensing Technology Based on Intensity Interrogation.

Churou Huang1,2, Guoxuan Zhu1,2, Zhiyong Bai1,2

  • 1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

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Summary
This summary is machine-generated.

A new optical fiber sensor uses orbital angular momentum (OAM) mode intensity changes for sensing. This technology offers a simple, stable method for precise measurements like temperature sensing.

Keywords:
chiral long-period fiber gratingintensity interrogationorbital angular momentumtemperature sensor

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensors
  • Photonics

Background:

  • Orbital Angular Momentum (OAM) modes offer unique light properties.
  • Existing fiber optic sensing methods can be complex or unstable.
  • Developing novel sensing technologies is crucial for advanced applications.

Purpose of the Study:

  • To propose and implement a novel optical fiber sensing technology.
  • To utilize the intensity distribution change in OAM modes for sensing external parameters.
  • To demonstrate the application of this technology in temperature measurement.

Main Methods:

  • Utilizing a chiral long-period fiber grating (CLPFG) to excite the 1st-order OAM (OAM1) mode.
  • Tracking intensity changes in the superposition state of fundamental and OAM1 modes.
  • Applying the technology to temperature sensing within a specific range.

Main Results:

  • A good linear relationship was observed between intensity distribution change and temperature (30-100 °C).
  • Achieved a sensitivity of 103 px/°C and a resolution of 0.0097 °C for temperature measurement.
  • Demonstrated potential for further sensitivity and resolution improvement by adjusting image collection area.

Conclusions:

  • The proposed OAM-based fiber optic sensing technology is effective for parameter measurement.
  • The CLPFG-based approach offers advantages in structure, realization, and stability over previous methods.
  • This technology shows significant potential for practical applications in various sensing fields.