Abstract
Resonator micro optic gyro (RMOG) with a waveguide-type ring resonator is
a promising candidate for applications requiring small, light and robust
gyros. In optical passive ring resonator gyros, clockwise (CW) and counter
clockwise (CCW) lightwaves are phase-modulated at different frequencies to
reduce the backscattering induced noise. The effectiveness of this
technique, however, is determined by the carrier suppression level. In this
paper, the influence of the carrier suppression level on the gyro
performance is examined experimentally for an RMOG system with a silica
waveguide resonator. In our experiment, carrier suppression is applied onto
both the CW and the CCW lightwaves at the same time to achieve higher total
suppression. We show that carrier suppression as high as 100 dB can be
achieved by optimizing the amplitude of the phase modulation. A bias
stability of 0.46°/s in 50 seconds is demonstrated in an RMOG with a silica
waveguide ring resonator having a ring length of 7.9 cm. This is the best
result reported to date, to the best of our knowledge, for waveguide-type
ring resonator gyros of this size.
© 2011 IEEE
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