Fig. 1. Cross sections; (a) PBF; (b) conventional polarization-maintained fiber^[11].

Fig. 2. Cross section of the fusion splicing point between the PBF and the conventional Panda fiber.

Fig. 3. Scheme of the measurement of fusion-splicing-induced reflection in a PBFOG.

Fig. 4. (a) Modulation voltage applied on an IOC; (b) corresponding modulation phase for the secondary wave WA; (c) corresponding modulation phase for the secondary wave WB.

Fig. 5. Modulation voltage and interference signals; (a) between WA and WC; (b) between WA and WB.