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.
We demonstrate high-precision free-space time and frequency transfer (FSTFT) based on laser in the presence of motion with digital phase-locked loop. Radio frequency with 1 GHz and time signal with one pulse per second (1 PPS) are transmitted over 108 m indoor atmospheric link. The experimental results reveal remarkable frequency stability with instabilities of 1.5E-14 at 1 s and 8.0E-16 at 100 s, even in the presence of a time-varying link characterized by speeds of ± 1.5 m/s. And time interval transfer of 1 PPS signal with 32 ps standard deviation of time delay jitter is obtained.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.