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In this paper, we explore the spectral properties of the moving hollow-corephotonic crystal waveguides (PCWs). We find that frequency combs could begenerated in the hollow cores of the moving PCWs. Besides, amplitudes of thesidebands in the generated frequency combs are strongly dependent on thespatial field distribution of the core-guided modes of stationary PCWs.Particularly, we find that introduction of the periodic point defects to theinnermost rows of the PCW hollow core would significantly modify the spatialfield distributions of the guided modes, leading to appearance of the tightlylocalized defect modes. This, in turn, leads to the enhancement andequalization of the amplitudes of the side bands in the frequency combsgenerated by the moving PCWs.

Amplitude-flattened frequency combs in the moving photonic crystals