Pulse polarization switching is an important new method to eliminate the polarization-induced fading (PIF) in the
interferometric fiber sensing system. An integrated Ti-indiffused LiNbO3 Mach–Zehnder modulator is used to achieve
high-speed switch of the polarization state by switching the voltage between two appropriate voltages applied to the
modulator. The stability of the polarization switching is affected by environmental factors, especially the temperature. In
this paper, the stability of the polarization switching is studied. Firstly, the structure of the modulator and the principle of
the polarization switching are introduced. Secondly, a feedback control method to overcome the switch instability is
proposed. The output polarization state could be obtained by monitoring the intensity of the output light. Finally, the
high-speed and high-accuracy stable switching between two orthogonal polarization states is realized using this method
and experimentally demonstrated.
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