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We report the first demonstration of silica wave- guide optical passive ring resonator gyro OPRG based on the phase modulation spectroscopy technique. The ring resonator is composed of a 6-cm-long silica waveguide. Ob- served from the resonance curve, the free spectral range FSR of the resonator, the full width at half maximum FWHM of the resonance curve, the finesse F of the reso- nator, and the resonance depth are 3.4 GHz, 62 MHz, 54.8, and 70%, respectively. The detection sensitivity of this OPRG will be 7.310 5 rad/s. In the experiments, there is an acoustic-optical modulator AOM in each light loop. We lock the lasing frequency at the resonance frequency of the silica waveguide ring resonator for counterclockwise CCW lightwave; the frequency difference between the driving fre- quencies of the two AOMs is equivalent to the Sagnac fre- quency difference caused by gyro rotation. Thus, the gyro output is observed. © 2006 Society of Photo-Optical Instrumentation Engineers.

Waveguide-type optical passive ring resonator gyro using phase modulation spectroscopy technique