High precision measurement of broadband optical wavelength based on fiber optic sagnac interferometer

Precise measurement of broadband optical signal wavelength is important for high precision FOG. A method of high precision measurement of broadband optical signal average wavelength is promoted. Based on the theory, an optical interferometer is designed; the signal processing solution and detection algorithm are promoted. The precision of the solution is proved to be high. A weak signal detection circuit is designed to realize the algorithm. Experiment result indicates the solution is feasible.