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A fiber-optic attenuator calibration system based on a high frequency substitution method has been developed using a 30 MHz precision piston attenuator equipped with a laser interferometer as a standard. The uncertainty of attenuation calibration for a typical 10 dB attenuator is 0.025 dB at two standard deviation levels. The resolution of the system is 0.001 dB and the dynamic range is 25 dB in a single step. © 1999 American Institute of Physics.