Simultaneous refractive index and temperature measurement using a cascaded long-period grating device

Bashir A.L. Gwandu, Xuewen Shu, Thomas D.P. Allsop, Wei Zhang, Lin Zhang, David Webb

Research output: Chapter in Book/Published conference outputConference publication


We present a compact scheme for simultaneous temperature and surrounding refractive index (SRI) measurement using two long period gratings (LPGs) of different periods inscribed side-by-side in a single piece of a double-cladding fibre. One of the LPGs is sensitive to both SRI and temperature changes whilst the second is SRI-insensitive but shows spectral shift with temperature changes. In addition, we show that a resonance peak of the SRI-insensitive LPG can be designed to appear in the EDFA wavelength region with potential use for gain flattening applications.
Original languageEnglish
Title of host publicationProceedings of IEEE Sensors, 2002
Number of pages4
ISBN (Print)0780374541
Publication statusPublished - 12 Jun 2002
Event1st IEEE international conference on Sensors - Orlando, FL, United States
Duration: 12 Jun 200214 Jun 2002


Conference1st IEEE international conference on Sensors
Abbreviated titleIEEE Sensors 2002
Country/TerritoryUnited States
CityOrlando, FL

Bibliographical note

1st IEEE International Conference on Sensors, Kissimmee, FL (US).


  • simultaneous temperature
  • surrounding refractive index(SRI)
  • long period gratings(LPGs)
  • double-cladding fibre
  • EDFA wavelength


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