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With the development of micro and small aircraft, unmanned systems, autonomous driving, wearable human navigation technology, missile guidance, and other fields. Accuracy is no longer the only core indicator of inertial navigation systems. Low cost, size, quality, and power (CSWaP) have become the key to enhancing the competitiveness of inertial technology products. Due to the large size and independent packaging of optical components, it is difficult to improve the CSWaP comprehensive performance of fiber optic gyroscopes (FOGs) under traditional solutions. Currently, using integrated optical technology to realize the integration of FOGs is the main way to reduce the comprehensive indicators of CSWaP of FOGs. Integrated FOGs refer to FOGs that use integrated optical chips to partially or completely replace optical devices of traditional FOGs. In this article, we propose a design scheme for a specialized integrated device of three-axis FOGs, which can achieve the integration of the main optical components of the interferometric fiber optic gyroscope optical path. It is of great significance for promoting the development process of miniaturization, lightweight, integration, low power consumption, and low cost of FOGs.
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