Analysis of FBG reflection spectra under uniform and non-uniform transverse loads

Alberto Milazzo, Roger M. Groves, Aydin Rajabzadeh, Luigi Fazzi

Research output: Contribution to conferenceOtherpeer-review

1 Citation (Scopus)


Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generatingbirefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the singlepeak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x- and y-polarizedwave-modes to model the uniform FBG reflection spectra for uniform and non-uniform transverse loads. We alsoperformed experimental measurements for two different transverse load scenarios. The load profiles chosen for theseexperiments were applied on the FBG sensor through a block of steel and a roll bearing pin. Then, the modelled andexperimental results were compared resulting in good agreement of 85% (on average). Finally, during the roll bearing pinloading test, different responses were observed depending how the FBGs were surface mounted. To investigate this, theglue layer influence on the reflected spectrum was further studied experimentally.
Original languageEnglish
Number of pages9
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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