High Stability Fiber Optics Sensors with an improved PGC demodulation algorithm

In this paper, an optical fiber interferometric sensor with improved phase generated carrier (PGC) demodulation algorithm is proposed to eliminate the influence of light intensity disturbance. Performance of sensor using proposed algorithm is analyzed and compared with sensor using differential-cross-multiplying (PGC-DCM) algorithm and PGC Arctangent (PGC-Arctan) algorithm, respectively. Experimental results show that distortion, but also harmonic distortion is well suppressed by the improved PGC algorithm. In experiment, the signal-to-noise and distortion ratio of sensor using the proposed algorithm achieve a gain of 16.4 and 10.8 dB over sensor using PGC-DCM and PGC-Arctan algorithm, respectively.