KLT Based Interrogation Technique for FBG Multiplexed Sensor Tracking

Javier Hervás, Daniele Tosi, Héctor García-Miquel, David Barrera, Carlos R. Fernández-Pousa, Salvador Sales

Research output: Contribution to journalArticle

7 Citations (Scopus)


The Karhunen-Loeve transform (KLT) is used to retrieve the wavelength information of several fiber Bragg gratings (FBGs) that are acting as a multiplexed sensor. The modulated light of a broadband source is launched to the FBG cascade in order to capture the electrical frequency response of the system. Thanks to a dispersive media, the wavelengths of the FBGs are mapped in radiofrequency (RF) delays. Wavelength changes are determined by the amplitude change of the samples in the impulse response, a change which is followed by the eigenvalue calculated by the KLT routine. The use of the KLT routine reduces by three orders of magnitude the amount of points needed to have a sub-degree resolution in temperature sensing, while keeping the accuracy almost intact.

Original languageEnglish
Article number7575720
JournalJournal of Lightwave Technology
Issue number99
Publication statusPublished - Jan 1 2016



  • fiber Bragg gratings
  • Karhunen-Loeve transform
  • microwave photonics
  • Optical fiber sensors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Hervás, J., Tosi, D., García-Miquel, H., Barrera, D., Fernández-Pousa, C. R., & Sales, S. (2016). KLT Based Interrogation Technique for FBG Multiplexed Sensor Tracking. Journal of Lightwave Technology, PP(99), [7575720]. https://doi.org/10.1109/JLT.2016.2613131