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A novel digital active homodyne demodulation scheme based on square‐wave phase modulation for interferometric fiber‐optic sensors
Author(s) -
Feng Xiujuan,
Zhang Chunxi,
Liang Sheng,
Li Chuansheng,
Zhang Chaoyang
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25640
Subject(s) - demodulation , direct conversion receiver , interferometry , homodyne detection , phase modulation , electronic engineering , optics , phase detector , local oscillator , integrator , engineering , physics , phase noise , bandwidth (computing) , electrical engineering , telecommunications , channel (broadcasting) , voltage
A novel digital active homodyne demodulation scheme to eliminate the signal fading in interferometric fiber‐optic sensors is proposed. The error signal is obtained by the square‐wave phase modulation and then the digital correlation detection technique is applied to demodulate the low‐frequency environmental phase drift and generate the offset phase, which is then fed back the integrated optical phase modulator to lock the interferometer in quadrature. The high‐frequency signal phase can be read out and recovered from the photodetector output with the interferometer in quadrature. The simulation and experimental results verify the feasibility of the proposed scheme, which obviates the feedback integrator saturation and the system resetting problem encountered in the conventional active homodyne detection schemes. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:20–23, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25640