Time Synchronization over a Free-Space Optical Communication Channel

Published on 2018-12-03T17:45:39Z (GMT) by
Free space optical (FSO) communication channels are typically used to transmit high-speed data between sites over the air. Here we repurpose an FSO digital communication system and use it directly for two-way time transfer. We demonstrate real-time synchronization between two sites over a turbulent air path of 4 km using binary phase modulated CW laser light. Under synchronization, the two sites exhibit a fractional frequency deviation below 10¨¹⁵ and a time deviation below 1 picosecond at one-hour averaging time. Over an 8-hour period the peak to peak wander is 16 ps.

Cite this collection

Khader, isaac; Bergeron, Hugo; Sinclair, Laura; Swann, William; Newbury, Nathan; Deschênes, Jean-Daniel (2018): Time Synchronization over a Free-Space Optical Communication Channel. The Optical Society. Collection.