Distributed optical fiber time-frequency joint delivery system and delivery method
A time-frequency transmission, distributed optical fiber technology, applied in optical fiber transmission, wavelength division multiplexing systems, time division multiplexing systems, etc. Main link time transfer stability and other issues, to simplify the system complexity and ensure the accuracy of time synchronization
Active Publication Date: 2020-02-07
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
But this will reduce the power of the main link to transmit the optical signal, and it will also deteriorate the stability of the time transfer of the main link
Before we proposed a distributed time transfer scheme [see Wu Guiling; Precision long-distance distributed optical fiber time transmission, but this linear distributed system can only realize time synchronization of users on a single optical fiber link, and cannot realize point-to-multipoint optical fiber time and frequency transmission in multiple optical fiber links
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[0034]The present invention will be further described below in conjunction with drawings and embodiments. This example provides the detailed implementation and specific workflow of the present invention, but the protection scope of the present invention is not limited to the following examples.
[0035] In this embodiment, the distributed optical fiber time-frequency joint delivery system (such as figure 1 shown), including: master clock 1, master time-frequency transfer unit 2, several slave time-frequency transfer units 3 and several optical fiber links 4. The master clock 1 is electrically connected to the master time-frequency transfer unit 2 , and the master time-frequency transfer unit 2 and each slave time-frequency transfer unit 3 are connected through multiple optical fiber links 4 . The time signal and frequency signal of the master clock 1 are sent by broadcast through the master time-frequency transfer unit 2 , and arrive at each slave time-frequency transfer unit...
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The invention discloses a distributed optical fiber time-frequency combined transmission system and transmission method. The system is composed of a master clock, a master time-frequency transmissionunit, a plurality of slave time-frequency transmission units and a plurality of optical fiber links. According to the method, a wavelength division multiplexing mode is adopted to carry out time and frequency combined transmission, and point-to-multipoint distributed time and frequency combined transmission is realized through a passive optical branching mode; each slave time frequency transmission unit measures the transmission time delay of the optical fiber link by using a loopback method, and performs time delay adjustment on the received time signal by taking the received frequency as a reference to obtain a time signal synchronous with the master clock, thereby realizing the combined transmission of the time signal and the frequency signal.
Description
technical field [0001] The invention relates to time-frequency transmission, in particular to a distributed optical fiber time-frequency combined transmission system and transmission method. Background technique [0002] High-precision time-frequency synchronization technology has important application value in the fields of satellite navigation, aerospace, deep space exploration, particle accelerator, scientific research and measurement. Traditional high-precision time-frequency synchronization technologies mainly include GPS-based common-view schemes and satellite-based two-way comparison schemes. Although such space-based time-frequency transfer technologies have been quite mature or their feasibility has been verified, they have their own system The shortcomings of complexity, high cost, long implementation period, poor security and poor reliability can no longer meet the needs of current applications. [0003] Optical fiber transmission has the advantages of low loss, ...
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IPC IPC(8): H04J14/02H04J3/06H04J3/16H04B10/25H04B10/40
CPCH04B10/2589H04B10/40H04J3/0647H04J3/1652H04J14/02
Inventor 吴龟灵左发兴胡亮陈建平
Owner SHANGHAI JIAOTONG UNIV