Abstract: In view of the stability problem that the optical fiber Mach-Zehnder interference (MZI) is easily impacted by the environment, the MZI experiment system has been designed. The output intensity of the optical fiber MZI is analyzed theoretically and validated by experiment. The relationship between the stability of the MZI and the environment and the impact of phase modulation on the interference are also revealed intuitively by the oscilloscope. A new phase compensation scheme is designed to solve the instability which results from vibration noise, temperature variation and so forth. The scheme can realize phase difference detection and feedback control.

Key words: laser techniques, phase compensation, optical fiber Mach-Zehnder interference, phase modulation