The investigation on phase stabilization technology of a near-infrared single-mode fiber Mach-Zehnder interferometer
2021
We present an estimation method and an investigation on the
phase-noise stabilization for a near-infrared fiber Mach–Zehnder
interferometer (MZI) using a laser diode at 1530 nm as the light source.
Based on the theoretical analysis, the phase noise is mainly produced by
the tiny fluctuations of external temperature, whose amplitude is
proportional to the optical path difference (OPD) between two arms of
optical fibers in the interferometer. By minimizing the length difference
between two fibers in the MZI and specifying the compensation signal
applied to the piezoelectric transducer (PZT) modulator actively, the
interferometer worked stably at different phase differences. When the
interferometer was working at the 90° phase difference, which is usually
necessary for practical application, the RMS noise was minimized to 0.47°.
By quantitative analysis, the magnification ratio of noise amplitude at
room temperature per unit OPD of the MZI was 132.29°/m
(=0.73rad/m). In this experiment, a good
linear correlation between the initial OPD and the phase signal intensity
was successfully observed. Using this estimation method, an optical fiber
interferometer of different wavelengths can be built more conveniently in
practical engineering applications.
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