Reflective SOA fiber cavity adaptive laser source for measuring dynamic strains

Heming Wei, Chuanyi Tao, Sridhar Krishnaswamy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Smart sensors based on Optical fiber Bragg gratings (FBGs) are suitable for structural health monitoring of dynamic strains in civil, aerospace, and mechanical structures. In these structures, dynamic strains with high frequencies reveal acoustic emissions cracking or impact loading. It is necessary to find a practical tool for monitoring such structural damages. In this work, we explore an intelligent system based on a reflective semiconductor optical amplifier (RSOA)- FBG composed as a fiber cavity for measuring dynamic strain in intelligent structures. The ASE light emitted from a RSOA laser and reflected by a FBG is amplified in the fiber cavity and coupled out by a 90:10 coupler, which is demodulated by a low frequency compensated Michelson interferometer using a proportional-integral-derivative (PID) controller and is monitored via a photodetector. As the wavelength of the FBG shifts due to dynamic strain, the wavelength of the optical output from the laser cavity shifts accordingly, which is demodulated by the Michelson Interferometer. Because the RSOA has a quick transition time, the RSOA-FBG fiber cavity shows an ability of high frequency response to the FBG reflective spectrum shift, with frequency response extending to megahertz.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2016
EditorsTribikram Kundu
PublisherSPIE
ISBN (Electronic)9781510600461
DOIs
StatePublished - Jan 1 2016
EventHealth Monitoring of Structural and Biological Systems 2016 - Las Vegas, United States
Duration: Mar 21 2016Mar 24 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9805
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherHealth Monitoring of Structural and Biological Systems 2016
CountryUnited States
CityLas Vegas
Period3/21/163/24/16

Keywords

  • Reflective SOA
  • dynamic strains
  • fiber Bragg gratings
  • structural health monitoring

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Wei, H., Tao, C., & Krishnaswamy, S. (2016). Reflective SOA fiber cavity adaptive laser source for measuring dynamic strains. In T. Kundu (Ed.), Health Monitoring of Structural and Biological Systems 2016 [980526] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9805). SPIE. https://doi.org/10.1117/12.2217699