Measuring Optical Length and Analyzing Accuracy Error Based on All-Fiber Optic Interferometer

摘要

An optical length measuring system base on all-fiber optic interferometer is proposed.The theoretical analysis indicates that,when the two branches of the interferometer are equal,the output have the maximum coherent intensity.Therefore,the optical length can be obtainedby measuring the distance of collimator movement.Through the experiment and simulation,the impact of the signal-to-noise ratio and fluctuation of the coupling efficiency on null error has been obtained.