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We develop a method to constrain non-isotropic features of Cosmic MicrowaveBackground (CMB) polarization, of a type expected to arise in some modelsdescribing quantum gravity effects on light propagation. We describe theexpected signatures of this kind of anomalous light propagation on CMB photons,showing that it will produce a non-isotropic birefringence effect, i.e. arotation of the CMB polarization direction whose observed amount depends in apeculiar way on the observation direction. We also show that the sensitivitylevels expected for CMB polarization studies by the \emph{Planck} satellite aresufficient for testing these effects if, as assumed in the quantum-gravityliterature, their magnitude is set by the minute Planck length.

Using CMB data to constrain non-isotropic Planck-scale modifications to Electrodynamics