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In this work, a novel design of a photonic crystal ring resonator with superellipse shape based on a thermo-optic switch is studied. This ring resonator with superellipse shape provides higher flexibility of light manipulation to design a structure with high performance to switch wavelengths. The proposed design composed of two waveguides between them, the photonic crystal ring resonator is placed. Tunability phenomena can change the refractive index of whole structure with an external effect. Based on this phenomena, our proposed design can switch the wavelength 1582 nm after an external effect (thermal effect), in which the refractive index of our proposed design change slightly from 3.19 to 3.25. The results achieved for our proposed switch based on novel ring resonator at 1582 nm where quality factor and footprints are 1977.5 and 277 μm², respectively. The value of lattice constant ‘a’ and radius of rods …