Broadband source-driven resonant integrated optical gyroscope using a low modulation frequency

Resonant integrated optical gyroscopes (RIOGs) driven by broadband sources offer a promising solution for achieving high-precision and miniaturized inertial devices. Traditional approaches to optimize angle random walk (ARW) require high-frequency modulation on the order of tens to hundreds of MHz for optical noise suppression, posing a significant challenge to the signal processing systems. This paper proposes a broadband source-driven RIOG scheme utilizing low modulation frequencies. By employing an optical cancellation method and increasing the number of supported modes in the microcavity (MR), the proposed scheme overcomes the modulation frequency limitations inherent in traditional schemes. The experiment employs a 3-cm-diameter whispering gallery mode microcavity (WGMR) that supports seven modes within one free spectral range (FSR), achieving an ARW of 0.17°/√h at a modulation frequency of 300 kHz. This performance represents a 6 dB improvement over conventional schemes. This approach effectively reduces modulation frequency requirements while maintaining high-precision measurements, providing an innovative solution for the practical engineering application of miniaturized, high-precision optical gyroscopes.