Fig. 1. Time signal generation and measurement principle

Fig. 2. Circuit diagram of pulse generation using avalanche triode

Fig. 3. Frequency domain results and time domain results of time signal

Fig. 4. Schematic of absolute phase of radio frequency transfer on fiber with phase self-calibration

Fig. 5. Frequency transmission performance test results with or without time signal

Fig. 6. Frequency stability test results of 60 km optical fiber links

Fig. 7. Delay measurement results of 60 km optical links

Fig. 8. Delay test results and absolute phase transmission results of 60 km link

Fig. 9. The adjusted delay and the final phase difference after multiple restarts