The development of fiber optic gyroscopes is changing with each passing day. Not only scientists are enthusiastic about this, but many large companies have also joined the ranks of research and development due to their optimistic market prospects. Since fiber optic gyroscopes are ideal for use in mobile carriers and military fields, the military of various countries has invested huge financial resources and energy.At present, some developed countries such as the United States, Japan, Germany, France, Italy, and Russia have made great progress in the research of fiber optic gyroscopes. Some medium and low-precision gyroscopes have been commercialized, and a few high-precision products have also begun to be debugged in the military. The United States has always maintained a leading position in the research of fiber optic gyroscopes.At present, many types of fiber optic gyroscopes have been put into use in the United States. Scientific research institutions represented by Stanford University and Massachusetts Institute of Technology have continuously made breakthroughs in the research field, and several large companies that develop fiber optic gyroscopes have also done a great job in gyroscope development and productization. The most famous Litton Company and Honeywell Company represent the highest level of fiber optic gyroscopes in the world. Following the United States, Japan is at the forefront of the world in the practical application of medium and low-precision gyroscopes. Many companies have begun to mass-produce a variety of medium and low-precision fiber optic gyroscopes. The first generation of fiber optic gyroscopes in several Western European countries and Russia have also been put into production, and a few medium and high-precision gyroscopes have been equipped in the air force, navy and missile forces.The research on fiber optic gyroscopes in China started relatively late, but with the efforts of a large number of scientific researchers, the gap with developed countries has been gradually narrowed. China Aerospace Corporation, Shanghai 803 Institute, Tsinghua University, Zhejiang University, North China Jiaotong University, Beihang University and other units have successively carried out research on fiber optic gyroscopes. According to the information currently available, the research and development accuracy of China's fiber optic gyroscopes has reached the high-precision requirements of inertial navigation systems, and some technologies have even exceeded the advanced level of similar foreign products.