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Related Experiment Video

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Optical Microfiber All-Optical Phase Modulator for Fiber Optic Hydrophone.

Minwei Li1,2,3, Yang Yu2,3, Yang Lu4

  • 1Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China.

Nanomaterials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary

A novel optical microfiber all-optical phase modulator was developed for phase generated carrier (PGC) demodulation in fiber optic hydrophones. This modulator achieves efficient underwater acoustic signal demodulation below 1 kHz.

Keywords:
PGC demodulationall-opticalfiber optical hydrophoneoptical microfiber

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Area of Science:

  • Optoelectronics
  • Photonics
  • Acoustic Sensing

Background:

  • Interferometric fiber optic hydrophones require advanced phase generated carrier (PGC) demodulation technology.
  • Existing phase modulators may not meet the efficiency and bandwidth demands for underwater acoustic signal processing.

Purpose of the Study:

  • To propose and develop an optical microfiber all-optical phase modulator (OMAOPM) for PGC demodulation.
  • To optimize the OMAOPM for enhanced modulation efficiency and working bandwidth.
  • To demonstrate its application in a fiber optic hydrophone system for underwater acoustic signal demodulation.

Main Methods:

  • Photo-induced thermal phase shift effect utilized for phase modulation.
  • Optical microfiber (OM) structural parameters optimized (waist length 15 mm, waist diameter 1.4 μm).
  • Construction of a fiber optic hydrophone PGC-Atan demodulation system for testing.

Main Results:

  • The OMAOPM achieved a modulation amplitude of 1 rad, suitable for sensing applications.
  • The developed system successfully demodulated simulated underwater acoustic signals.
  • Effective demodulation was demonstrated for signals below 1 kHz.

Conclusions:

  • The proposed OMAOPM is a viable component for PGC demodulation in fiber optic hydrophones.
  • The optimized modulator and demodulation system meet the requirements for underwater acoustic sensing.
  • This technology advances the capability of detecting low-frequency underwater acoustic signals.