Resonant Micro-Optic Gyro (RMOG) is a kind of optical sensors measuring angular velocity via Sagnac Effect, which yields different central resonant frequency between the clockwise (CW) and counterclockwise (CCW) light path of a ring-resonator when rotating. In this paper, Y-type branch waveguide is put forward to replace K-type coupler in RMOG to reduce the influence of splitting ratio asymmetry due to fabrication errors and temperature drift. Y-type branch waveguide based on silicon-on-silica is designed and analyzed. Simulation results show that Y-type branch waveguide performs better fabrication tolerance than K-type coupler, which reduces the nonlinear Kerr-Effect induced noise excited by power nonuniformity of the counter-propagating beams, therefore the detection sensitivity of RMOG can be improved.
Resonance integrated optical gyroscope, Polarization-maintaining waveguide, Single-mode condition, Birefringence. Abstract. A polarization-maintaining (PM) waveguide used in Resonance Integrated Optical Gyro (RIOG) is theoretically proposed. Three essential factors determining the PM performance, which are the single-mode condition, birefringence and core index, are analyzed and optimized respectively. The single-mode rectangular waveguide is obtained by analyzing the propagation mode of the rectangular waveguide. A high birefringence waveguide design method is brought up according to the theory of geometrical birefringence, realized by changing the cross-sectional shape of the waveguide. The effect that the core index contributes to the birefringence is also discussed, and an optimal core index of the waveguide to reach maximal birefringence is determined in the condition of single-mode transmission. The high birefringence PM Waveguide with geometrical birefringence of 1.5×10-4 is obtained by theoretical analysis, the simulation results shows that the polarization cross-talk in RIOG is obviously improved.
Resonator Integrated Optic Gyro (R-IOG) adopts advantages of the micro integrated optoelectronic technique, whose ring resonator is fabricated by optical integrated circuit. Polarization fluctuation induced noise is one of the dominant noise sources in resonator. State of polarization (SOP) of the input light, polarization maintaining quality of the coupler and the waveguide and the fluctuation of the temperature are main parameters which affect polarization noise of integrated optical gyro. Through simulations and experiments, three countermeasures are introduced. The first and second are for exciting one polarization mode of the waveguide. The first way is modulating the SOP of the input light utilizing polarization controller or polarizer and the second one is raising polarization maintaining quality of the waveguide through the birefringence caused by residual stress and core size. The third way is increasing the distance of two resonance dips by control the temperature at an appropriate point to fix one resonance dip at the center of the other resonance interval. The polarization noise can be suppressed through the ways mentioned above.
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