Volume 7 Issue 4
Aug.  2014
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GUO Li-jun, NING Liang, KONG Mei, CHEN Tuo-yuan. Demodulation characteristics of resonator integrated optical gyro[J]. Chinese Optics, 2014, 7(4): 651-656. doi: 10.3788/CO.20140704.0651
Citation: GUO Li-jun, NING Liang, KONG Mei, CHEN Tuo-yuan. Demodulation characteristics of resonator integrated optical gyro[J]. Chinese Optics, 2014, 7(4): 651-656. doi: 10.3788/CO.20140704.0651

Demodulation characteristics of resonator integrated optical gyro

doi: 10.3788/CO.20140704.0651
  • Received Date: 21 Feb 2014
  • Rev Recd Date: 16 Apr 2014
  • Publish Date: 25 Jul 2014
  • According to the light transmission directions, we analyzed the light propagation in the resonator integrated optical gyro system based on laser frequency modulation spectrum technique. Combining with the feature of the input signal, we established the mathematical model in frequency domain. The demodulation curve was obtained in frequency modulation method by numerical simulation and experiment. Firstly, according to the transmission direction of light: the laser, acousto-optic crystal frequency shifter, optical waveguide ring resonator, detector, we analyzed the demodulation characteristics of resonator integrated optical gyro using Bessel function and optical field coupled mode theory as well as the relationship between the frequency modulation demodulation output signal and the resonant frequency deviation. Then, we analyzed variation rule of demodulation curve and obtained the best modulation coefficient applied in laser's piezoelectric ceramic transducer drive. Finally, we built a laser frequency modulation and demodulation technology system in experiment and obtained the demodulation curve. When the modulation coefficient M=2, the linear interval slope is maximum, and the demodulation curve is the best. Numerical simulation and experimental results show that the measured shape is consistent with the theoretical prediction. From the demodulation signal, a gyro dynamic range of 2.0103 rad/s is obtained.

     

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