Fig. 1. Schematic diagram of optical fiber time synchronization based on double fiber round-trip ratio method

Fig. 2. Timing diagram of optical fiber time synchronization system based on double fiber round-trip ratio method

Fig. 3. Measured values of time interval counters at 1310 nm and 1550 nm with temperature variation.

Fig. 4. Measured values of time interval counters at 1490 nm and 1550 nm under temperature variation. (a) T_IC1 and T_IC2; (b) T_IC3

Fig. 5. Calculated value of one-way transmission delay τ1

Fig. 6. One-way transmission delay estimation accuracy. (a) 1310 nm and 1550 nm; (b) 1490 nm and 1550 nm

Fig. 7. Estimation accuracy after adding wavelength jitter. (a) 1310 nm and 1550 nm; (b) 1490 nm and 1550 nm