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A method of adding squared signals of three polarization diversity receiver to overcome the polarization induced fading (PIF) in the optical fibre hydrophone is proposed and experimentally verified. This triple polarization diversity receiver (tri-PDR) is first analysed and theoretically demonstrated. Then, a Mach-Zehnder interferometric sensor with polarization rotator in the reference arm is fabricated...
Doppler noise caused by the time delay of interrogation pulses in the inline FBG-based hydrophones is theoretically investigated and experimentally verified. This noise is first demonstrated by arranging a piezoelectric transducer (PZT) in front of a FBG-based interferometric senor. Measured Doppler noise is about −61.21dB, with time delay between two interrogation pulses of 210ns and frequency of...
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