A new measurement algorithm for the 3 x 3 fiber optic Sagnac interferometer

We developed a new measurement algorithm which enables fiber optic sensors based on the 3 x 3 Sagnac interferometer to have a dynamic range which is limited only by the speed of the electronics measuring the signals of the photodetectors. Fiber optic current sensors and fiber optic gyroscopes using our algorithm can measure arbitrary large input and improve precision by using longer fiber coils. We proved the concept by building a passive fiber optic gyroscope.