Fig. 1. Section images. (a)PM-PCFs; (b)HCFs

Fig. 2. Basic configuration of PCFOG

Fig. 3. Section image of a typical PM-PCFs

Fig. 4. Dependence of birefringence on Λ

Fig. 5. Relationship between birefringence temperature sensitivity coefficient and Λ

Fig. 6. Measured birefringence temperature sensitivity coefficient under different Λ

Fig. 7. Relationship between birefringence variation and radiation dose

Fig. 8. Image of ED-PCFs cross section

Fig. 9. Radiation comparison experiment of EDFs. (a) M-12; (b) ED-PCFs

Fig. 10. Schematic of 1×N fiber coupling

Fig. 11. Ending and side view of PMFs and PM-PCFs in welding machine

Fig. 12. Relationship between fusion loss and fusion current

Fig. 13. (a) Configuration of PCFOG prototype; (b) photograph of three-axis PCFOG prototype

Fig. 14. Typical performance curve of PCFOG. (a) Static testing; (b) Allan variance; (c) scale factor

Fig. 15. Photograph of radiation experiment scene