In interferometric fiber Fabry-Perot (FFP) sensor systems, environmental disturbances in interrogation interferometers are a dominant source of noise. In a fiber Bragg grating defined FFP sensor system, the antinoise techniques utilizing reference sensor and reference wavelength are compared with each other. Signal-to-noise ratio improvements of 40 dB have been achieved experimentally for both single-frequency and broadband disturbances. Moreover, because of the lower noise level of the reference fiber laser with a narrow linewidth, the differential result of the reference wavelength approach exhibits a better antinoise effect.