Directions of development of optical gyroscopes based on passive ring resonators

The main approaches to the construction of optical gyroscopes based on passive ring resonators are analyzed and reviewed. The history of the development of the first prototypes of such gyroscopes, which were in the focus of attention in the late 70s as a part of trials of vanishing the lock-in zone of laser gyroscopes, is considered. Modern studies of optical gyroscopes based on passive ring resonators are performed due to the trend towards the miniaturization of optical gyroscopes. The main disadvantages and problems of such gyroscopes as well as possible solutions are described. In particular, the results of research performed by the authors of the article are presented. The main types of gyroscope sensitive elements and their achievable characteristics are considered