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Numerical simulation of light reflection from a lambda/2 GaN microcavity with Ga0.8Al0.2N/Ga0.5Al0.5N Bragg mirrors grown on the A-surface of Al2O3 revealed a Rabi-splitting of the order of 50 meV and remarkable optical anisotropy. In a separate Bragg mirror, the exciton interference results in a 95% modulation of reflection spectra. These effects originate from the giant exciton oscillator strength in GaN and a pronounced uniaxial strain in the structure. (C) 1999 Elsevier Science S.A. All rights reserved.