Coriolis force and Sagnac effect

The optical Sagnac effect is considered, when the fictitious gravitational field simulates the reflections from the mirrors. It is shown that no contradiction exists between the conclusions of the laboratory and rotated observers. Because of the acting of a gravity-like Coriolis force, the trajectories of coand anti-rotating photons have different radii in the rotating reference frame, while in the case of equal radii the effective gravitational potentials for the photons have to be different.