Low-coherence interrogation scheme for multiplexed sensors based on long-period-grating Mach - Zehnder interferometers

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


We present a low-coherent interferometric system of multiplexed sensors based on pairs of long-period gratings (LPGs). The LPGs in each pair have approximately 3-dB transitivity and form an in-fiber Mach-Zehnder interferometer. By using a dual-beam Michelson interferometer with two reflective mirrors, the interferometric signature of the LPG pair is obtained fast and accurately by scanning one of the mirrors. For multiple sensors, their center-to-center grating intervals are preset to be discrete with specific spacing, which ensures the interferometric signatures are separated for simultaneous demodulation. A measurement of bending is demonstrated to verify good performances of the system in terms of low crosstalk and high sensitivity.
Original languageEnglish
Pages (from-to)832-834
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number7
Publication statusPublished - 1 Apr 2006
Externally publishedYes


  • Fiber-optic sensor
  • Long-period gratings (LPGs)
  • Low-coherence interference
  • Mach-Zehnder interferometer
  • Michelson interferometer

ASJC Scopus subject areas

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

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