Optical gyros based on the Sagnac effect are attractive sensors for inertial navigation systems in applications such as space launch, satellites, drones and aeroplanes. As many of these vehicles move to more compact platforms (e.g. cube sats, drones, etc), interest in improving robustness, reliability, overall size, weight, cost and power consumption with minimal sacrifice of sensitivity has accelerated. Integrated optics is an obvious approach to achieving this.

This presentation will introduce optical gyroscopes, review the performance limiting factors for different types of optical gyros, and compare the performance of those suitable for planar integration in order to find the optimum type and structure. A key element will be shown to be high quality factor resonator structures, and the design and fabrication challenges for such will be discussed along with preliminary experimental results. Phase modulators are also key components and the design and optimisation of planar thermo-optic devices will also be discussed.