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This paper proposes a wavelength sensor using a section of curved optical waveguide. The finite-difference time-domain (FDTD) method is used in analysis of the field intensity of light propagating thorough the structure. Light with different wavelengths would propagate in different energy transmission, which allows to the technique to indicate the light wavelength. Parameters of the structure such as: w, T and R are appropriately considered. The device with a width of 0.6 μm and thickness of 0.6 μm provides the maximum light transmission. At the particular curve radius of 3 μm, the structure could be employed to measure the communication wavelengths, in this case in a range between 1520 and 1580 nm, with a correlation factor of 99.82%. The wide band of wavelengths could possibly be carried out using a number of wavelength-sensing modules for particularly required bands.