Abstract
In this paper, a novel method to improve the sensitivity of RIOGs is demonstrated by double-electrode phase modulation (DPM) technology. The scale factor of RIOGs with single-electrode phase modulation (SPM) and DPM are theoretically analyzed and calculated. The relationship between the slope rate in the linear region adjacent to the zero-offset point and the amplitudes of the triangle waveform with SPM and DPM are obtained; the RIOG's highest sensitivity appears when the triangle waveforms have amplitudes of 45.9 and 22.95V, respectively. Compared with the SPM, the DPM shows great advantage in improving the RIOG scale factor, as well as its bias stability. Moreover, in measurements using the RIOG experimental setup, the scale factor is significantly increased from 1.49 to 2.76, which is coincident with the simulation result. The test results for long-term bias stability demonstrate that the DPM has the advantage of improving the signal-to-noise ratio (SNR); significantly, the RIOG long-term bias stability is greatly improved from 0.61 to 0.49deg/s, which is the best long-term stability result reported to date, to the best of our knowledge, for a waveguide-type integrated optical resonator (IOR).
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