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A method and system for simultaneous transmission of multi-user optical fiber time and frequency

A time-frequency, multi-user technology, applied in transmission systems, electromagnetic wave transmission systems, time-division multiplexing systems, etc., can solve problems such as increased costs, error accumulation, errors, etc., to reduce equipment costs, high-precision time and frequency The effect of transmitting and guaranteeing symmetry

Active Publication Date: 2018-06-05
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

If a point-to-point solution is used to achieve multi-site synchronization, a large number of optical fiber time-frequency transfer devices are required for cascading and splitting, which not only increases a lot of costs, but also introduces errors in the process of cascading and splitting, and multi-level cascading will also accumulation of errors

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  • A method and system for simultaneous transmission of multi-user optical fiber time and frequency
  • A method and system for simultaneous transmission of multi-user optical fiber time and frequency

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Embodiment Construction

[0028] The present invention first proposes a method for simultaneous transmission of multi-user optical fiber time and frequency. The method only occupies one wavelength channel, and realizes the synchronous transmission of time signals and frequency signals and the transmission of time codes in a time-division multiplexing manner; In the form of a transmission center, a transmitter can provide time frequency and time code services to multiple users in different places. Method of the present invention specifically comprises the following steps:

[0029] 1) The encoder in the launch center encodes the reference time signal, reference frequency signal, time code, current user number, and round-trip transmission delay between the launch center and the current user in a time-division multiplexed manner to form a launch center Encoded signal from the encoder;

[0030] 2) Convert the coded signal of the coder of the launch center into an optical signal by the laser, and send it to...

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Abstract

The invention discloses a multi-user method for synchronously transmitting optical fiber time frequency and a system thereof. According to the method, only one wavelength channel is occupied; synchronous transmission of time signals and frequency signals, and transmission of time codes are realized in a time division multiplexing mode; and service of supplying time frequency and time codes to multiple remote users by one transmitter at a transmission center is realized in a bus form. According to the method and the system, the high-precision time and frequency transmission is realized; optical fiber resources are saved; device costs are reduced; the service of supplying the time frequency and time codes to multiple remote users by one transmitter at the transmission center is realized; and formation of networking application to optical fiber time frequency transmission is facilitated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber time synchronization, and relates to an optical fiber synchronization method and system, in particular to a method and system for simultaneously transmitting optical fiber time and frequency for multiple users. Background technique [0002] In aerospace, radar synchronization, cutting-edge weapon control, high-speed communication, deep space exploration and other fields, there are high requirements for time signal synchronization and frequency signal phase synchronization. The current long-wave timing can only achieve synchronization accuracy of microseconds, satellite common viewing can only achieve synchronization accuracy of nanosecond level, and even the expensive satellite two-way comparison method can only achieve synchronization accuracy of hundreds of picoseconds. The optical fiber time frequency transmission method can achieve the time synchronization accuracy of 100 picoseconds, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04B10/69
CPCH04B10/691H04J3/0682
Inventor 张首刚陈法喜赵侃刘涛周旭
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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