2015/01/26 by Aliaksandr Bialiayeu, Anatoli Ianoul, Bialiayeu, Aliaksandr +3
Engineering · #Advanced Fiber Optic Sensors #FOS: Physical sciences #Optical Network Technologies #Optics (physics.optics) #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.1501.06550
openalex publication_date 2015/01/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Polarization based sensing with tilted fiber Bragg grating (TFBG) sensors is\nanalysed theoretically by two alternative approaches. The first method is based\non tracking the grating transmission for two orthogonal states of linear\npolarized light that are extracted from the measured Jones matrix or Stokes\nvectors of the TFBG transmission spectra. The second method is based on the\nmeasurements along the system principle axes and polarization dependent loss\n(PDL) parameter, also calculated from measured data. It is shown that the\nfrequent crossing of the Jones matrix eigenvalues as a function of wavelength\nleads to a non-physical interchange of the calculated principal axes; a method\nto remove this unwanted mathematical artefact and to restore the order of the\nsystem eigenvalues and the corresponding principal axes is provided. A\ncomparison of the two approaches reveals that the PDL method provides a smaller\nstandard deviation and therefore lower limit of detection in refractometric\nsensing. Furthermore, the polarization analysis of the measured spectra allows\nfor the identification of the principal states of polarization of the sensor\nsystem and consequentially for the calculation of the transmission spectrum for\nany incident polarization state. The stability of the orientation of the system\nprincipal axes is also investigated as a function of wavelength.\n