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Revolutionizing Underwater Sensor Performance: Tackling Rayleigh Scattering Challenges by Pseudo Random Noise.

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Summary
This summary is machine-generated.

Rayleigh scattering significantly impacts fiber optic interferometric sensors (FOIS) even with shorter fiber lengths due to Rayleigh backward scattering (RBS) interactions. A novel pseudorandom noise (PRN) phase modulation method effectively suppresses this background noise, enhancing underwater sensing capabilities.

Keywords:
Rayleigh scatteringfiber optic interferometric sensorsphase modulationpseudorandom noise codes

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Area of Science:

  • Optical Physics
  • Fiber Optic Sensing
  • Signal Processing

Background:

  • Rayleigh scattering traditionally considered negligible in fiber sensing below 10 km.
  • Rayleigh backward scattering (RBS) interaction with returning interference signals in FOIS is often overlooked.
  • Existing FOIS systems may be limited by unaddressed background noise.

Purpose of the Study:

  • To theoretically and experimentally demonstrate the impact of RBS on FOIS performance with shorter leading fibers.
  • To elucidate the interaction mechanism between RBS and FOIS interference signals.
  • To develop and validate a novel method for mitigating RBS-induced noise in FOIS.

Main Methods:

  • Development of a conceptual framework to analyze RBS-FOIS interference.
  • Investigation of laser pulse characteristics (monochromacity, self-correction) influence on coherent superposition.
  • Proposal and implementation of a phase modulation method using pseudorandom noise (PRN) codes.
  • Experimental validation of the PRN method in a 3.3 km FOIS system.

Main Results:

  • Demonstrated that RBS significantly affects FOIS performance even with hundreds of meters of leading fiber.
  • Identified laser pulse self-correction as a factor influencing coherent superposition.
  • Achieved a 21.3 dB suppression of background phase noise using the PRN phase modulation method.
  • Preserved high laser monochromacity while mitigating RBS stacking.

Conclusions:

  • Rayleigh scattering is a critical factor in FOIS performance, irrespective of fiber length, due to RBS.
  • The proposed PRN phase modulation technique effectively suppresses coherent RBS stacking.
  • This research enhances understanding of Rayleigh scattering in leading fibers, improving underwater sensing applications.