Fig. 1. Schematic diagram of gas flowing from fiber to the atmosphere after being heated

Fig. 2. Typical structure diagrams of (a) photonic bandgap hollow core fiber and (b) anti-resonant hollow core fiber

Fig. 3. Schematic diagrams of thermally induced (a) transmission window, (b) effective modal index and (c) group index changes in a hollow core fiber

Fig. 4. Schematic diagram of anti-resonant hollow core fiber wound on a fiber spool

Fig. 5. Cross sectional structure diagram of thinly coated anti-resonant hollow core fiber

Fig. 6. (a) Schematic diagram of fiber loop; (b) Cross sectional structure diagram of anti-resonant hollow core fiber loop

Fig. 7. Schematic diagram of thermally induced gas flow in hollow core fiber

Fig. 8. (a) Schematic diagram of interconnection between hollow core fiber and solid core fiber; (b) Image and schematic diagram of connector-style interconnection device

Fig. 9. Schematic diagram of fiber connector positioning in a small gas chamber

Fig. 10. Results of tuning the thermal sensitivity by applying pressure controlling in a 10 m anti-resonant hollow core fiber

Fig. 11. Schematic diagram of low thermal sensitivity Mach-Zehnder interferometer

Fig. 12. Schematic diagram of low thermal sensitivity Fabry-Perot interferometer

Fig. 13. Schematic diagram of Shupe effect in fiber optic gyroscope

Fig. 14. Schematic diagram of optically-switched data centers^[100]

Fig. 15. Schematic diagram of optoelectronic oscillator

Fig. 16. Schematic diagram of optical frequency combs distribution based on hollow core fibers^[106]