Abstract: The configuration of optical fiber Mach-Zehnder（MZ） interferometer system is introduced. The principle of signal optic beam intervening reference optic beam and the factors of influencing the intensity of interferential optic beam are prestented. Meanwhile, the cross coupling of optical fiber coupler is analysed. The effect of PZT is studied. The configuration and principle of the optical fiber polarization controller are described. The polarizing state of optical fiber reference arm how to be controlled is discussed. Finally, the application of the interferometer system is also shown.

Key words: optical fiber polarization controller, optical fiber MZ interferometer, interferometric principle, application