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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26578–26588

Closed-loop resonant fiber optic gyro with an improved digital serrodyne modulation

Zhonghe Jin, Xuhui Yu, and Huilian Ma  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 26578-26588 (2013)

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To widen the linear dynamic range and improve the linearity, a closed-loop resonant fiber optic gyro (RFOG) is proposed and experimentally demonstrated. To overcome the effect of the imperfect serrodyne modulation, an improved frequency shifting module is designed and constructed on a LiNbO3 phase modulator. Its frequency resolution is improved to 0.01Hz which is equivalent to a rotation rate of 0.04°/h for an RFOG with a 12-cm diameter fiber ring resonator. With the frequency shifter applied in the RFOG, a closed-loop detection is demonstrated, whose bias stability is around 2 °/h, close to that of the open-loop output. Moreover, good linearity and wide dynamic range are also experimentally demonstrated thanks to the closed-loop operation. The measured result shows that the open-loop linear detection range of ± 215°/s is improved to ± 1076°/s. It is improved by a factor of 5. The open-loop scale factor nonlinearity of 1.2% is decreased to 0.02% (200ppm), which is improved by a factor of 60. These are the best results reported to date, to the best of our knowledge, for closed-loop RFOGs.

© 2013 Optical Society of America

OCIS Codes
(060.2800) Fiber optics and optical communications : Gyroscopes
(120.5790) Instrumentation, measurement, and metrology : Sagnac effect
(230.5750) Optical devices : Resonators

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: September 3, 2013
Revised Manuscript: October 15, 2013
Manuscript Accepted: October 15, 2013
Published: October 28, 2013

Zhonghe Jin, Xuhui Yu, and Huilian Ma, "Closed-loop resonant fiber optic gyro with an improved digital serrodyne modulation," Opt. Express 21, 26578-26588 (2013)

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