公开(公告)号：US11063740B1

公开(公告)日：2021-07-13

申请号：US16942357

申请日：2020-07-29

Applicant: Vector Atomic, Inc.

Inventor： Arman Cingoz ,  Abijith Sudarsan Kowligy ,  Jonathan David Roslund

IPC: H04B10/00 ,  H04L7/00 ,  G02B6/42 ,  H04J14/02 ,  H04J14/00

Abstract: Embodiments herein describe sub-picosecond accurate two-way clock synchronization by optically combining received optical pulses with optical pulses generated locally in a photonic chip before the optical signals are then detected by a photodetector to obtain an interference measurement. That is, the optical pulses can have different repetition rates so that the offset between the received and local optical pulses constantly changes, thereby resulting in different interference measurements. Optically combining the pulses in the photonic chip avoids much of the jitter introduced by the electronics. Further, the sites can obtain multiple interference measurements which can be evaluated to accurately determine when the optical pulses arrive at the site with femtosecond accuracy.