The model of transformation of one-dimensional, high-contrast silicon photonic crystal (PC) into a Fabry-Pérot resonator is considered. This transformation is achieved either by decreasing the number of periods up to 1.5 or the introduction of optical defect in the ordinary multi-period PC while retaining a high modulation of the resonance peaks up to ~0.95. The simultaneous use of maps of photonic band gaps (PBG) and transmission bands can predict the appearance or disappearance of PBGs in the

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... optical spectra as well as to determine their position and width depending on the order of the band-gap (or stop-band) and the value of the filling fraction. The variation of the refractive index by 0.2 results in significant shift of the resonance peaks of high order up to 10% of the frequency corresponding to the center of the peak.