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The time delay reflection spectrum of fiber Bragg gratings (including uniform and non-uniform fiber Bragg gratings) is an extremely useful tool in the field of fiber-optic sensing. Its applications include but are not limited to the measurement of temperature, strain, pressure, and refractive index. Fiber Bragg gratings have been widely used in various fields such as structural health monitoring, aerospace, and oil and gas industry. In addition, the construction of fiber Bragg gratings can be achieved through different methods, such as UV exposure, phase mask inscription, and direct writing. These different methods offer unique advantages and disadvantages, depending on the specific application and the desired grating characteristics. Therefore, it is important to carefully select the most appropriate method for each individual case.