Differential Group Delay Analysis of Uniform Bragg Gratings Written in Hi-Bi Optical Fibers

Fibre Bragg Gratings (FBG) have become key components in optical communications systems, and, in the same time, lightwave transmissions are more intolerant to the polarization mode dispersion. Consequently, the polarization properties of FBG are of paramount importance. In this frame, we analyze the wavelength dependency of Differential Group Delay in the particular case of a uniform Bragg Grating written in a highly birefringent fibre. Based on the coupled mode theory, a theoretical expression for the differential group delay is derived. We also present experimental results obtained by the Jones Matrix Eigenanalysis Method. A good agreement with theory is reported.