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Reflection properties of a one-dimensional photonic crystal are investigated depending on the crystal anisotropy axis orientation. So-called penetration phenomenon for an incident wave is discussed. Special attention focuses on the case of the tangentional orientation of both the incident wave and the anisotropy axis with respect to a crystal surface. Nonreciprocal optical devices based on the crystal are proposed. Their operating principles are based on the crystal reflection properties, not on the Faraday effect. Numerical data for an optical isolator and a frequency detector are presented.