期刊
OPTICA
卷 5, 期 12, 页码 1542-1548出版社
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.5.001542
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资金
- Defense Advanced Research Projects Agency (DARPA)
- National Institute of Standards and Technology (NIST)
Future high-precision free-space optical (FSO) clock networks will require laser links to transmit time-frequency between sites and, with this information, to synchronize the times across widely separated clocks. FSO communication networks already use laser links between remote sites to transmit high-speed data. Here we repurpose a FSO digital communication system and use it directly for two-way time-frequency transfer. We demonstrate synchronization of the time between two sites separated by a turbulent air path of 4 km using binary-phase-modulated continuous-wave laser light. Under synchronization, the two sites exhibit a fractional frequency deviation below 10(-1)5 at 1500 s averaging time and a time deviation below 1 ps at averaging times of seconds to hours. Over an 8 h period, the peak-to-peak wander is 16 ps. This method should be applicable to future ground-to-space and intra-satellite links and could lead to an improved global navigation and satellite system. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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