This paper introduces the basic principle a kind of Mach-Zehnder fiber-optic sensor. We use polarization optics to study the output light intensity. We analyze the direct light source modulation for phase carrier technology in detail. During the process we analyze the PGC (phase generated carrier) demodulation scheme we meet a problem and we improved PGC demodulation scheme to solve it. The improved PGC demodulation scheme is analyzed and verified the effectiveness. of the proposed scheme. And the improved scheme is compared with PZT modulation technology.
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