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 journalArticlepeer-review

9 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 dispersive media, the wavelengths of the FBGs are mapped in radio-frequency 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 subdegree resolution in temperature sensing, while keeping the accuracy almost intact.

Original languageEnglish
Pages (from-to)3387-3392
Number of pages6
JournalJournal of Lightwave Technology
Issue number16
Publication statusPublished - Aug 15 2017


  • Fiber Bragg gratings
  • Karhunen-Loeve transform
  • microwave photonics
  • optical fiber sensors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'KLT-Based Interrogation Technique for FBG Multiplexed Sensor Tracking'. Together they form a unique fingerprint.

Cite this