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In cutting-edge scientific research fields such as deep space exploration, radio astronomy, and basic physical measurements, as well as fields related to the national economy and people's livelihood, such as navigation and positioning, communications, electricity, and finance, the accuracy of "seconds" is far from enough - we need to obtain higher time and frequency accuracy
.
The research team of Shanghai Jiao Tong University independently developed optical fiber time transmission technology to accurately "synchronize" time, which will be exhibited at the 20th China International Industry Fair
, which opened on the 19th of this month.
The research team of Shanghai Jiao Tong University has developed a high-precision optical fiber time synchronization system
.
(Photo courtesy of Shanghai Jiao Tong University)
In order to give full play to the utility of high-precision time-frequency references, promote scientific research such as deep space exploration, land observation, and determination of basic physical constants, realize high-precision navigation and positioning, national time-frequency systems, and support a new generation of communications, electric power, finance, intelligent transportation, and the Internet of Things, it is urgent to develop high-precision wide-area time synchronization systems
.
The research team of Shanghai Jiao Tong University adopts a number of independent core patented technologies such as "two-way time-division same-fiber and same-wave transmission", "low-jitter auto-alignment time encoding and decoding", "single-fiber two-way transmission-unidirectional amplification", "single-fiber two-way photoelectric relay and multiple download", etc.
, to effectively suppress the influence of backscattered noise while maximizing the symmetry of two-way transmission of the link without the need for link calibration.
The transmission accuracy is better than 100 picoseconds (1 picosecond is equal to 1,000 billionths of a second), and the distance is more than 13,000 kilometers, which is at the international leading level; The system has a variety of networking methods, which can be flexibly networked according to application requirements, and can be embedded in existing optical networks, maximizing the use of optical network resources to achieve ultra-long-distance, distributed, and large-scale high-precision time transmission; It can be used to support the construction of national/international time-frequency systems, satellite navigation, aerospace and other major infrastructure and projects when forming unified standards, and can also meet the needs
of communications, electricity, finance, distributed radar, intelligent transportation, Internet of Things and other needs for accurate time synchronization.
The developed optical fiber time synchronization system has completely independent core intellectual property rights, including: 1 invention patent authorized in the United States and Europe, 11 invention patents authorized by the state, 1 patent applied for in the United States and Europe, 3 PCT patents and 6 national invention patents
.
He has published more than 20 papers in international journals and top conferences in the field of time and frequency
.
The application of the system will also bring significant social benefits
in many ways.
The application in the national time and frequency system, satellite navigation and other major national infrastructure will provide key support for the construction of high-precision, independent, safe and reliable national time standards and navigation and positioning systems.
By providing high-precision time, it can not only greatly improve the observation ability of existing scientific research, but also provide a basis for the development of new detection methods and methods, and promote many cutting-edge basic scientific research, including gravitational wave detection and relativity verification.
By providing low-cost nanosecond (ns) time synchronization for 5G, Internet of Things, etc.
, it will play a major role
in promoting the construction and development of 5G and other related industries.
In cutting-edge scientific research fields such as deep space exploration, radio astronomy, and basic physical measurements, as well as fields related to the national economy and people's livelihood, such as navigation and positioning, communications, electricity, and finance, the accuracy of "seconds" is far from enough - we need to obtain higher time and frequency accuracy
.
The research team of Shanghai Jiao Tong University independently developed optical fiber time transmission technology to accurately "synchronize" time, which will be exhibited at the 20th China International Industry Fair
, which opened on the 19th of this month.
The research team of Shanghai Jiao Tong University has developed a high-precision optical fiber time synchronization system
.
(Photo courtesy of Shanghai Jiao Tong University)
In order to give full play to the utility of high-precision time-frequency references, promote scientific research such as deep space exploration, land observation, and determination of basic physical constants, realize high-precision navigation and positioning, national time-frequency systems, and support a new generation of communications, electric power, finance, intelligent transportation, and the Internet of Things, it is urgent to develop high-precision wide-area time synchronization systems
.
The research team of Shanghai Jiao Tong University adopts a number of independent core patented technologies such as "two-way time-division same-fiber and same-wave transmission", "low-jitter auto-alignment time encoding and decoding", "single-fiber two-way transmission-unidirectional amplification", "single-fiber two-way photoelectric relay and multiple download", etc.
, to effectively suppress the influence of backscattered noise while maximizing the symmetry of two-way transmission of the link without the need for link calibration.
The transmission accuracy is better than 100 picoseconds (1 picosecond is equal to 1,000 billionths of a second), and the distance is more than 13,000 kilometers, which is at the international leading level; The system has a variety of networking methods, which can be flexibly networked according to application requirements, and can be embedded in existing optical networks, maximizing the use of optical network resources to achieve ultra-long-distance, distributed, and large-scale high-precision time transmission; It can be used to support the construction of national/international time-frequency systems, satellite navigation, aerospace and other major infrastructure and projects when forming unified standards, and can also meet the needs
of communications, electricity, finance, distributed radar, intelligent transportation, Internet of Things and other needs for accurate time synchronization.
The developed optical fiber time synchronization system has completely independent core intellectual property rights, including: 1 invention patent authorized in the United States and Europe, 11 invention patents authorized by the state, 1 patent applied for in the United States and Europe, 3 PCT patents and 6 national invention patents
.
He has published more than 20 papers in international journals and top conferences in the field of time and frequency
.
The application of the system will also bring significant social benefits
in many ways.
The application in the national time and frequency system, satellite navigation and other major national infrastructure will provide key support for the construction of high-precision, independent, safe and reliable national time standards and navigation and positioning systems.
By providing high-precision time, it can not only greatly improve the observation ability of existing scientific research, but also provide a basis for the development of new detection methods and methods, and promote many cutting-edge basic scientific research, including gravitational wave detection and relativity verification.
By providing low-cost nanosecond (ns) time synchronization for 5G, Internet of Things, etc.
, it will play a major role
in promoting the construction and development of 5G and other related industries.