Coherence multiplexing of sensors based on long-period fibre grating mach-zehnder interferometers

Zu Guang Guan, Aping Zhang, Ran Liao, Meng Jiang, Sailing He

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

A novel interrogation scheme for multiplexing the sensors based on long-period grating (LPG) Mach-Zehnder interferometers (MZIs) is proposed. Each LPG-MZI is formed by a pair of cascaded identical LPGs and induces an additional optical path difference (OPD) proportional to the centre-to-centre interval between the two LPGs. A sub-reflectogram including sensing information can be achieved when the OPD induced in one LPG-MZI is compensated by scanning one arm of a Michelson interferometer to a certain range. For multiple sensors, the grating intervals of different LPG-MZIs are set to different values to ensure that their sub-reflectograms can be well separated in time domain. The spectral response of the LPG-MZI is reconstructed from the corresponding sub-reflectogram with a fast Fourier transformation. Applications of the bending and temperature monitoring are demonstrated by measuring the signals in time domain and wavelength domain, respectively.
Original languageEnglish
Title of host publicationPassive Components and Fiber-based Devices III
Volume6351 II
DOIs
Publication statusPublished - 27 Dec 2006
Externally publishedYes
EventPassive Components and Fiber-based Devices III - Gwangju, Korea, Republic of
Duration: 5 Sep 20067 Sep 2006

Conference

ConferencePassive Components and Fiber-based Devices III
Country/TerritoryKorea, Republic of
CityGwangju
Period5/09/067/09/06

Keywords

  • Coherence multiplexing
  • Interference intensity
  • Long-period grating mach-zehnder interferometer
  • Reconstructed spectra
  • Scanning michelson interferometer
  • Sub-refletcogram

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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