Effects of laser intensity noise on polarimetric distributed feedback fibre laser ultrasonic sensor

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Abstract

The influence of the relative intensity noise, in particular the relaxation oscillation noise, of a distributed feedback (DFB) fibre laser on the performance of a polarimetric DFB fibre laser ultrasonic sensor is investigated theoretically and experimentally. A novel demodulation algorithm for the DFB fibre laser ultrasonic sensor is used to demodulate the polarization beat frequency and eliminate the effects of the intensity noise completely. The sensing system is demonstrated to demodulate time varying ultrasonic signals at 2.25 MHz and 10 MHz.
Original languageEnglish
Title of host publication26th International Conference on Optical Fiber Sensors
Place of PublicationWashington D.C.
PublisherOptical Society of America
Number of pages4
ISBN (Print)978-1-943580-50-7
DOIs
Publication statusPublished - 24 Sep 2018
Event The 26th International Conference on Optical Fibre Sensors - SwissTech Convention Center, EPFL Campus, Lausanne, Switzerland
Duration: 24 Sep 201828 Sep 2018
Conference number: 26
https://www.ofs26.org/site/OFS-26/page-143739.html

Conference

Conference The 26th International Conference on Optical Fibre Sensors
Abbreviated titleOFS-26
CountrySwitzerland
CityLausanne
Period24/09/1828/09/18
Internet address

Keywords

  • distributed feedback
  • fibre laser
  • intensity noise

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