Changkun Feng, Yonggui Zhang, Honghao Ma, Hui Li, Lishuang Feng, "Improving long-term temperature bias stability of an integrated optical gyroscope employing a Si3N4 resonator," Photonics Res. 10, 1661 (2022)

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- Photonics Research
- Vol. 10, Issue 7, 1661 (2022)

Fig. 1. Relationship between gyroscope sensitivity and coupling coefficient at different waveguide propagation losses.

Fig. 2. Variation of the peak value of the resonance curve at different propagation losses.
![(a) According to the polarization model [19] calculated three-dimensional resonance curve output at different birefringences; D=35 mm, σ=30°, ε=3°, αx=αy=0.5 dB/m, kx=ky=0.05, αCx=αCy=0.01 dB. (b) The relationship between the resonance curve of the resonator and the polarization axis error of the incident light; D=35 mm, ε=0°, αx=αy=0.5 dB/m, kx=ky=0.05, αCx=αCy=0.01 dB. (c) When the polarization-dependent loss αy=800 dB/m, the relationship between the resonance curve of the resonator and the polarization axis error of the incident light; D=35 mm, ε=10°, αx=0.5 dB/m, kx=ky=0.05, αCx=αCy=0.01 dB.](/Images/icon/loading.gif)
Fig. 3. (a) According to the polarization model [19] calculated three-dimensional resonance curve output at different birefringences; D = 35 mm , σ = 30 ° , ε = 3 ° , α x = α y = 0.5 dB/ m , k x = k y = 0.05 , α Cx = α Cy = 0.01 dB . (b) The relationship between the resonance curve of the resonator and the polarization axis error of the incident light; D = 35 mm , ε = 0 ° , α x = α y = 0.5 dB/ m , k x = k y = 0.05 , α Cx = α Cy = 0.01 dB . (c) When the polarization-dependent loss α y = 800 dB/ m , the relationship between the resonance curve of the resonator and the polarization axis error of the incident light; D = 35 mm , ε = 10 ° , α x = 0.5 dB/ m , k x = k y = 0.05 , α Cx = α Cy = 0.01 dB .

Fig. 4. (a) Structure diagram of the Si 3 N 4 waveguide resonator, (b) TE mode, (c) TM mode.

Fig. 5. Infrared photograph of the Si 3 N 4 waveguide resonator with rear illumination showing scattered light.

Fig. 6. Relative test curve of the Si 3 N 4 waveguide resonator. SG, signal generator; ISO, isolator; PM, phase modulator; PD, photodetector; OSC, oscilloscope. (a) Resonance curve test system, (b) transmission curve, (c) reflection curve, and (d) backscattering curve.

Fig. 7. Measured resonance curves at different temperatures: (a) Si 3 N 4 waveguide resonator, (b) silica waveguide resonator.

Fig. 8. RIOG measurement system based on the Si 3 N 4 waveguide resonator. ISO, isolator; LiNbO 3 , lithium niobate; OC, optical circulator; PD, photodetector; ADC, analog digital converter; DAC, digital analog converter; Dem, demodulation; PI, proportional integral; FSD, frequency shift driver.

Fig. 9. Measurement results of the RIOG based on the Si 3 N 4 waveguide resonator at rest from the Allan variance analysis result: (a) at room temperature, (b) at 40°C, (c) at 50°C, and (d) at 60°C.

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