Polarization control method for ultraviolet writing of advanced Bragg gratings

We present a flexible and simple method for UV writing of Bragg gratings with advanced apodization profiles including discrete phase shifts. The method is based on a p phase shift between the refractive-index modulation profiles induced by s and p polarization of UV light. By changing the ratio of U...

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Bibliographic Details
Published in:Optics letters 2002-06, Vol.27 (12), p.1004-1006
Main Authors: Jensen, Jesper Bo, Plougmann, Nikolai, Deyerl, Hans-Jã Rgen, Varming, Poul, Hã Bner, Jã Rg, Kristensen, Martin
Format: Article
Language:English
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Summary:We present a flexible and simple method for UV writing of Bragg gratings with advanced apodization profiles including discrete phase shifts. The method is based on a p phase shift between the refractive-index modulation profiles induced by s and p polarization of UV light. By changing the ratio of UV intensity in the two polarizations we are able to control the modulation strength and to induce phase shifts while keeping a constant effective refractive index throughout the Bragg grating. We demonstrate strong UV-written Bragg gratings with Gaussian or sinc apodizations with spectral shapes, in good agreement with theoretical predictions.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.27.001004