Wavelength dependency of degree of polarization for uniform Bragg gratings written into polarization maintaining optical fibers

In this paper, we analyze the polarization properties of uniform Bragg gratings written into polarization maintaining fibers by studying the evolution with wavelength of the degree of polarization for both the reflected and transmitted signals. We present numerical simulations realized by means of the coupled mode equations and the Stokes formalism. We also present experimental results performed on a uniform Bragg grating inscribed into hydrogen-loaded bow-tie fiber. We then report a good agreement between theoretical and experimental evolutions. Finally, we investigate the behavior of the reflected degree of polarization when the grating is subjected to a change of external temperature.