A single-fiber one-way time transfer method and system

A time transfer, one-way technology, applied in transmission systems, electromagnetic wave transmission systems, time division multiplexing systems, etc., can solve problems such as incompatibility, and achieve the effect of simplifying the structure

CN111698032BActive Publication Date: 2021-04-20NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-04-20

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Abstract

The invention discloses a single-fiber one-way time transfer method and system, the system comprising: time frequency source, laser LD1, laser LD2, WDM1, optical fiber link, EDFA, WDM2, PD1, PD2, phase detector, MCU unit, automatic identification module, servo system, VCOCXO, phase shifter and time generation module. The invention accurately calculates the transmission delay of the optical fiber link according to the phase difference, and compensates it, so that the receiving end outputs a time signal that is synchronized with high precision at the transmitting end; the transmission delay resolution of the optical fiber link is improved by using a phase detector, and the It improves the accuracy of time synchronization between the receiver and the transmitter.
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Description

technical field

[0001] The invention belongs to the technical field of high-precision time transmission, and in particular relates to a single-fiber one-way time transmission method and system. Background technique

[0002] High-precision time-frequency has important application value in the fields of basic physics, earth science, space science, navigation and positioning, aerospace and military security, and precision time-frequency transmission technology has also been widely used in communications, power grids, transportation, finance, emergency rescue , environmental resource management and other social life. With the rapid development of basic scientific research and high-tech engineering applications, high-precision time transfer technology has increasingly become an important basic condition for frontier basic scientific research, high-tech engineering applications, and high-precision equipment to work together.

[0003] The current mainstream long-distance precision...

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Embodiment Construction

[0066] In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.

[0067] A single-fiber one-way long-distance high-precision time transfer method according to an embodiment of the present invention includes the following steps:

[0068] Step 1: The time frequency source outputs a frequency signal with frequency f, and modulates the frequency signal with frequency f on laser LD1 and laser LD2 ...