Absolutely consistent phase synchronization technology with a wide temperature range based on fiber-optic time and frequency transfer

For the demands of wide operating temperature for fiber-optic time and frequency synchronization applied to the actual system of distributed coherent detection, we propose an absolutely consistent phase synchronization method. Assisted by time delay, in the way of phase locking, we accomplish absolute consistent bias reference point control at different operating temperatures. Respectively at different environment temperature of -40°C and 50°C, the experimental results reveal 100 MHz frequency stabilities of 3.1694 E-13 at 1 s and 3.1513 E-13 at 1 s and the relative difference was less than 0.6%. The average value of 1pps delay was 275102808.1 ps and 275102864.9 ps respectively, and the relative difference was less than 0.1%. The 1pps synchronization accuracy is 21.1744 ps and 26.2030 ps separately.