Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation

Indexed in: Scopus, EBSCO.

The book is an exciting source of information for individuals interested in learning about and marketing sensors. The book focuses on scientific and commercial advances in Fiber Bragg Grating (FBG) ...
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Polarization Properties of Fiber Bragg Gratings and Their Application for Transverse Force Sensing Purposes

Pp. 116-142 (27)

Christophe Caucheteur, Sebastien Bette, Marc Wuilpart and Patrice Megret

Abstract

Due to the lateral inscription process, Fiber Bragg Gratings (FBGs) written into standard single-mode fiber can exhibit birefringence. The birefringence value is however too small to be perceived in the FBG spectral response but it can lead to significant polarization-dependent properties such as polarization dependent loss (PDL) and differential group delay (DGD). A transverse force applied on the FBG can enhance the birefringence, which increases both the PDL and DGD values. Hence, although these properties are not desired in telecommunication applications, they can be advantageously used for transverse force sensing measurements, allowing the use of FBGs written into standard single-mode optical fiber, which fail to work when they are interrogated through amplitude spectral measurements. This chapter first analyzes the normalized Stokes parameters, PDL and DGD evolutions with wavelength when the FBG parameters and the birefringence value are modified. It then focuses on the realization of a transverse force sensor based on the monitoring of the PDL and DGD evolutions.

Affiliation:

Electromagnetism and Telecommunications Department, Faculté Polytechnique, Université de Mons, BoulevardDolez 31, 7000 Mons, Belgium