The development of all-fiber-optic gyroscopes at Stanford University is reviewed. Fiber-optic components for the gyroscopes are described. Techniques to suppress various error sources, and different approaches to a linear scale factor with wide dynamic range, are discussed. Fiber-optic single sideband frequency shifters for closed-loop operation of gyroscopes are described. A new approach to high birefringence fiber gyroscopes, with broadband optical source and birefringence modulation, is presented. Other approaches, including the pulsed reentrant fiber gyro, are shown.