Fig. 1. FRR with in-line polarizers

Fig. 2. The resonant curves of FRR with twin 90° spliced polarization maintaining fiber. (a) ESOPs of CW; (b) CW resonance curve after multi-turn transmission; (c) ESOPs of CCW; (d) CCW resonance curve after multi-turn transmission

Fig. 3. Gyroscope output error caused by polarization noise of twin 90° spliced structure under varying temperature environment. (a) Output error of CW and CCW; (b) partial enlarged detail; (c) output error difference of CW and CCW

Fig. 4. Gyroscope output error caused by direct angle alignment error at the straight end of the coupler with different in-line polarizer extinction ratio

Fig. 5. Relationship between the ΔL and the output error of gyroscope. (a) Relationship between the ΔL and the output error of gyroscope; (b) partial enlarged detail

Fig. 6. Gyroscope output error caused by polarization noise under varying temperature environment when temperature disturbance acts on L₁, L₂, L₃ and L₄ after optimizing parameters

Fig. 7. Relationship between the non-uniform temperature distribution and the output error of gyroscope on L₁

Fig. 8. Relationship between the non-uniform temperature distribution and the output error of gyroscope on each segment of fiber