We report the realization of a new version of a fiber optic gyroscope (FOG), using low-cost multimode fiber components. This is achieved by an optimal choice of the components such as fiber, coupler, light source and photodetector. The aim behind this work is to demonstrate the versatility of the low-cost multimode FOG for rate-grade performance applications. Both analog signal processing and open-loop operation are used in the proposed FOG experiment. The obtained sensitivity is similar to 7 degrees/h and the angle random walk is about 0.087 degrees/root h. The influence of the coupler technology on the performances is investigated. (C) 2011 Elsevier Inc. All rights reserved.