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Polarization control method for UV writing of advanced Bragg gratings

We report the application of the polarization control method for the UV writing of advanced fiber Bragg gratings (FBG). We demonstrate the strength of the new method for different apodization profiles, including the Sinc-profile and two designs for dispersion-free square filters. The method has been tested for advanced FBGs with various strengths up to 65 dB.