Fig. 1. Schematic of photonic crystal fiber sensing system based on optical-borne microwave interference

Fig. 2. Simulation analysis diagram of optical-borne microwave interference based optical fiber sensing system. (a) Position-resolvable IFFT time domain spectrum; (b) S-parameter spectrum of signal frequency domain

Fig. 3. Optical-borne microwave interference spectrum for strain sensing experiments. (a) S-parameter spectrum of signal frequency domain; (b) position-resolvable IFFT time domain spectrum

Fig. 4. Optical-borne microwave interference spectrum after adding time domain door. (a) Position-resolvable IFFT time domain spectrum; (b) S-parameter spectrum of signal frequency domain

Fig. 5. Results of strain sensing experiments. (a) Frequency shift of the microwave interference signal under strain changes; (b) frequency shift and fitting results at the valley

Fig. 6. Results of high temperature sensing experiments. (a) Frequency shift of microwave interference signal under temperature change; (b) frequency shift at the valley and thermocouple temperature measurement curve

Fig. 7. Normalized result of frequency shift with different probe lengths as a function of temperature rise time