Ultrasonic hydrophone based on distributed Bragg reflector fiber laser

Bai Ou Guan, Hwa Yaw Tam, Sien Ting Lau, Helen L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

125 Citations (Scopus)


We demonstrate a novel fiber-optic hydrophone that uses a dual polarization distributed Bragg reflector (DBR) fiber laser as sensing element. The operation principle is based on the modulation of the birefringence of the fiber laser by high-frequency ultrasound. By measuring the amplitude and frequency of the sidebands as well as the polarization beat frequency of the output of the fiber laser using a photodetector and a radio-frequency spectrum analyzer, the amplitude and frequency of the acoustic pressure, and temperature can be determined simultaneously. The DBR fiber laser hydrophone has a linear response to acoustic pressure anal can detect acoustic frequency up to at least 40 MHz.
Original languageEnglish
Pages (from-to)169-171
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number1
Publication statusPublished - 1 Jan 2005


  • Acoustic sensor
  • Bragg grating
  • Fiber laser
  • Hydrophone
  • Optical fiber transducers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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