What is a Silicon Photonic Gyroscope

Simply put, a silicon photonic gyroscope is a high-precision navigation sensor integrated on a silicon-based chip, whose full name is Silicon Photonic Optical Gyroscope (SiPhOG). Its core function is to detect the rotation angle and attitude of an object, just like the gyroscope in our mobile phones, but it has higher precision and smaller size, and is the core component of a new generation of inertial navigation equipment. Its working principle is not complicated. Like traditional fiber optic gyroscopes, it uses the "Sagnac Effect" — when an object rotates, two beams of light propagating in opposite directions will produce a small optical path difference. By detecting this difference, the rotation speed and angle can be accurately calculated. However, compared with traditional fiber optic gyroscopes, the biggest advantage of silicon photonic gyroscopes is "miniaturization". It integrates the several kilometers of optical fiber coils in traditional gyroscopes into a small silicon chip through silicon photonics technology, completely getting rid of complex discrete components, greatly reducing the volume and weight. In addition, silicon photonic gyroscopes also have the characteristics of low cost, high reliability and suitability for mass production. They are manufactured using standard semiconductor production lines without manual precision assembly, and their price is much lower than that of traditional fiber optic gyroscopes. At the same time, they have an all-solid-state structure without moving parts, are resistant to vibration and impact, and can work stably in harsh environments. It perfectly balances precision and cost performance, making up for the insufficient precision of ordinary MEMS gyroscopes and solving the problems of large volume and high price of traditional fiber optic gyroscopes. At present, silicon photonic gyroscopes have been widely used in fields such as UAVs, autonomous driving, commercial aerospace and intelligent robots. They are key components supporting the development of emerging industries such as low-altitude economy and artificial intelligence, and also an important direction for China to achieve independent control of high-end sensors.