A re-entrant fiber optic gyro (RE-FOG) that utilizes a ring resonator (RR) and a low-coherence length light source is designed and demonstrated. A reflector is placed on one end of input/output directional coupler to realize light beams propagating in CW and CCW directions. RE-FOG promises a higher sensitivity than the conventional Sagnac interferometer fiber optic gyro (I-FOG) without the disadvantages of a resonant fiber optic gyro (R-FOG). Theoretical considerations of the sensitivity and the resolution of RE-FOG are discussed. Experimental results (the constant bias of 0.2 deg/h and the variance of random drift rate better than 0.1 deg/h) are also presented.
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