Microchanneled chirped fibre Bragg gratings for simultaneous refractive index and temperature measurements

Pouneh Saffari, Hongyan Fu, Kaiming Zhou, Lin Zhang, Ian Bennion

Research output: Chapter in Book/Published conference outputChapter


We report here the fabrication, charaterisation and refractive index sensing of two microchanneled chirped fiber Bragg gratings (MCFBGs) with different channel sizes (~550µm and ~1000µm). The chirped grating structures were UV-inscribed in optical fibre and the microchannels were created in the middle of the CFBGs by femtosecond (fs) laser assisted chemical etching method. The creation of microchannels in the CFBG structures gives an access to the external index liquid, thus inducing refractive index (RI) sensitivity to the structure. In comparison with previously reported FBG based RI sensors, for which the cladding layers usually were removed, the MCFBGs represent a more ideal solution for robust devices as the microchannel will not degrade the structure strength. The two MCFBGs were spectrally charaterised for their RI and temperature responses and both gratings exhibited unique thermal and RI sensitivities, which may be utilised for implementation of bio-chemical sensors with capability to eliminate temperature crosssensitivity.
Original languageEnglish
Title of host publicationOptical Sensors 2009 : proceedings
EditorsFrancesco Baldini, Jiri Homola, Robert A. Lieberman
Place of PublicationBellingham, WA (US)
Number of pages9
ISBN (Print)978-0-8194-7630-2
Publication statusPublished - 18 May 2009
EventOral presentation at SPIE Europe Optics and Optoelectronics - Prague, Czech Republic
Duration: 20 Apr 200923 Apr 2009

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


ConferenceOral presentation at SPIE Europe Optics and Optoelectronics
Country/TerritoryCzech Republic

Bibliographical note

Pouneh Saffari ; Hongyan Fu ; Kaiming Zhou ; Lin Zhang and Ian Bennion
"Microchanneled chirped fibre Bragg gratings for simultaneous refractive index and temperature measurements", Francesco Baldini ; Jiri Homola ; and Robert A. Lieberman (eds), Proc. SPIE 7356, Optical Sensors 2009, 735604 (May 18, 2009).
Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • photonics
  • fibre Bragg gratings


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