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Optical fiber microwave frequency transfer system for loop optical fiber link

A technology of ring fiber and microwave frequency, applied in the direction of electromagnetic wave transmission system, optical fiber transmission, transmission system, etc., can solve the problems of backscattering, wavelength asymmetry, limitation, etc., to ensure symmetry, save laser resources, and suppress interference The effect of frequency transfer on short-term stability effects

Active Publication Date: 2019-11-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The ring schemes that have been proposed are mainly based on the same frequency and the same wave and the wavelength division scheme, and the same frequency and the same wave scheme will be seriously affected by backscattering during transmission; the wavelength division scheme will be affected by wavelength asymmetry, making it in the limited in long-distance transmission

Method used

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  • Optical fiber microwave frequency transfer system for loop optical fiber link
  • Optical fiber microwave frequency transfer system for loop optical fiber link
  • Optical fiber microwave frequency transfer system for loop optical fiber link

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments. But the scope of protection of the present invention is not limited to the following examples.

[0030] Please see first figure 1 , figure 1 It is a structural block diagram of an embodiment of an optical fiber microwave frequency transmission system used in a ring optical fiber network in the present invention. The present invention is used in a passive phase-compensated microwave frequency transmission system for ring fiber links, the system includes a central end 1, a ring fiber link 2 and an access end 3, and the access ends 3 are distributed on the central end connected to the On the ring fiber link 2 of 1; the present invention is mainly used for the distributed structure of ring multi-point access. If multiple nodes are required to access, it is only necessary to connect the access point structure to the ring fiber.

[0031]The central terminal 1 includes a firs...

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Abstract

An optical fiber microwave frequency transmission system for a loop optical fiber link comprises a central end, an optical fiber link and access ends. The access ends can be distributed at any position on the annular optical fiber link connected with the central end. The influence of backscattering noise is avoided. The signal-to-noise ratio of a received signal is improved. The short-term stability of frequency transmission is improved. Meanwhile, wavelength asymmetry introduced by using a wavelength division multiplexing transmission mode is avoided. The influence of wavelength intervals onlong-term stability of frequency transmission is avoided.

Description

technical field [0001] The invention relates to optical fiber time-frequency transmission, in particular to an optical fiber microwave frequency transmission system for ring optical fiber network. Background technique [0002] As a basic physical quantity, time frequency has been widely used in radio astronomy, particle accelerators and high-precision clock comparison. In recent years, many countries (especially developed countries) have invested heavily in related high-tech to support their development. The best microwave clock reference source at present is a cesium-based atomic clock with a long-term frequency instability of 10 -16 order of magnitude. However, the equipment of high-stability atomic clocks is relatively complex, large in size, and has high requirements for the environment in which they are located. They cannot be portable and transported, and they are expensive. In order to meet the increasing demands of high-precision frequency sources in different fie...

Claims

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Application Information

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IPC IPC(8): H04B10/077H04B10/25H04B10/516
CPCH04B10/0775H04B10/5165H04B10/25891
Inventor 吴龟灵师平洋胡亮孔梦雅陈建平
Owner SHANGHAI JIAO TONG UNIV
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