Abstract

ABSTRACT 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 LiNbO 3 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 f actors, especially th e temperature. In this paper, the stability of the polarization switching is studie d. Firstly, the structure of the modulator and the principle o f 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. Keywords: Polarization-induced fading, Polarization switching, Feedback control, LiNbO

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