Fig. 1. Schematic structure of a spliceless open-loop FOG.

Fig. 2. (a) Schematic diagram of OFDR; (b) force of PZT on optical fiber; and (c) measurement results of fiber polarization cross talk.

Fig. 3. Inscription of fiber in-line wave plate. (a) Inscription setup; (b) inscription principle; (c) mechanism resulting birefringence; (d) polarization conversion; (e) PER evolution; (f) PER distribution of 10 samples.

Fig. 4. Fabrication of in-line PMC. (a) Bipolar symmetrically wound PZT modulator; (b) schematic of PMC fabrication processing; (c) photo of our fabrication setup; (d) measurement result of 20 samples.

Fig. 5. Enhanced FOG. (a) FOG configuration; (b) comparison of test results with wave plate and PMC added; (c) Allan variance.