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Atosecond-level optical fiber time transfer method between two stations

A time transfer, attosecond-level technology, applied in the field of optical fiber time transfer between remote high-precision stations, can solve problems that are difficult to exceed picosecond-level time transfer accuracy, and achieve low-cost effects

Active Publication Date: 2021-05-04
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that it is difficult to exceed the time transfer accuracy of the picosecond level in the actual application environment

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  • Atosecond-level optical fiber time transfer method between two stations
  • Atosecond-level optical fiber time transfer method between two stations

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Embodiment Construction

[0049] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] None of the currently published optical time transfer methods can solve the problem of the integer period of the optical carrier of the link delay, so precise absolute time transfer cannot be achieved, and only relative time change measurement can be performed.

[0051] For this, as figure 1 As shown, the present invention proposes a two-station-based attosecond optical fiber time transfer method, the method comprising:

[0052] The present invention adopts pseudo-random sequence of 100MHz frequency, 100GHz microwave carrier and 200THz optical carrier to realize time transfer between station A and station B.

[0053] S10. Station A sends a microwave modulation signal;

[0054] In a specific example, station A sends a pseudo-random sequence wit...

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Abstract

The embodiment of the invention discloses an attosecond-level optical fiber time transfer method based on two stations, and the method comprises the steps that S10, a first station carries out the modulation transmission of a 100MHz pseudorandom sequence, timestamp information and a 100GHz microwave carrier signal, and forms a microwave modulation signal; S20, the first station performs photoelectric conversion on the microwave modulation signal to obtain a first optical signal, and loads the first optical signal to a 200THz optical carrier signal to form a second optical signal; S30, the second optical signal is inputted to an optical fiber link between the first station and the second station; S40, the second station receives the second optical signal and converts the second optical signal into an electric modulation signal; S50, the second station performs phase-locked receiving and processing on the electric modulation signal to obtain a transmission delay pd1-2 from the first station to the second station. According to the technical scheme provided by the invention, the time transfer precision can reach attosecond magnitude, and the problem that the time transfer precision is difficult to exceed picosecond magnitude in an actual application environment is solved.

Description

technical field [0001] The invention relates to the field of optical fiber time transmission between remote high-precision stations. More specifically, it relates to an attosecond-level optical fiber time transfer method based on two stations and a method for realizing time transfer between two stations using the method. Background technique [0002] Optical time transfer technology is currently the most accurate time comparison method internationally recognized. It is widely used in the traceability and comparison of high-precision time values ​​of atomic clocks between stations within 100 kilometers. It has an irreplaceable position in time transfer and traceability methods. Optical time transfer is mainly to take advantage of the performance advantages of large optical fiber medium transmission bandwidth, small signal frequency loss, and small energy attenuation. The two places send and receive optical time pulse sequences through the optical fiber link. At the same time,...

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Application Information

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IPC IPC(8): H04B10/25H04B10/516
CPCH04B10/25H04B10/516
Inventor 王海峰张升康杨宏雷王学运王宏博易航王艺陶
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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