Sandwiched long-period gratings for simultaneous measurement of refractive index and temperature

Aping Zhang, Li Yang Shao, Jin Fei Ding, Sailing He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

116 Citations (Scopus)


A simultaneous measurement of external refractive-index (RI) and temperature is presented by using a sandwiched structure of long-period gratings (LPGs). An LPG pair with codirectional coupling between the guided mode and a low-order cladding mode acts as a temperature sensor with low RI sensitivity, whereas another in-between LPG which couples the guided mode with a higher order cladding mode performs as an RI sensing element. The experimental results show such an all-LPG structure is not only suitable for use as a compact temperature-compensated RI sensor, but also convenient for fabrication.
Original languageEnglish
Pages (from-to)2397-2399
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number11
Publication statusPublished - 1 Nov 2005
Externally publishedYes


  • Long-period fiber gratings
  • Optical fiber sensor
  • Refractive-index (RI) measurement
  • Temperature sensor

ASJC Scopus subject areas

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


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