This paper presents a new double-frequency method for the instantaneous frequency and amplitude measurement of
unknown microwave signal. Using the specific interaction of double-frequency radiation and FBG (fiber Bragg grating)
with a π phase shift allowed us to obtain measuring characteristics, that are independent of the energy fluctuations of the
optical carrier and the microwave signal, and reduce measurement inaccuracy caused by temperature instability of the
spectral characteristics of used elements.
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