Ultra-precise time frequency transfer method suitable for DWDM optical transmission system

Abstract

The invention discloses an ultra-precise time frequency transfer method suitable for a DWDM optical transmission system. The ultra-precise time frequency transfer method comprises the following steps of (a) firstly establishing a mathematical model of an ultra-precise optical fiber timing system; (b) completely achieving ultra-precise time frequency synchronism between a master station and a slave station of a DWDM optical transmission system; (c) then adopting an optical fiber time delay online monitoring technology to perform accurate measurement of a time delay value of each optical fiber in a DWDM optical cable; (d) compensating transmission time delay symmetric difference values of each pairs of optical fibers of the DWDM to be smaller than 0.1ns; (e) adopting the optical fiber time delay online monitoring technology and an optical fiber time delay automatic locking and isostatic compensation technology to reduce negative effects brought by stripping optical fiber time delay drifting and aging accumulation. Compared with the prior art, the problem that self-adaptation control of optical fiber time delay change values in a existing optical synchronous digital system, a packet transport network and other optical communication networks cannot be achieved and the synchronization precision is difficultly improved due to the defects existing in an original time synchronization technology is solved.

Description

technical field [0001] The invention relates to the fields of ultra-precise time-frequency synchronization technology and optical fiber communication technology, in particular to an ultra-precise time-frequency transfer method suitable for a DWDM optical transmission system. Background technique [0002] At present, Optical Synchronous Digital Hierarchy (SDH) and Packet Transport Network (PTN), as the main transport network, occupy a large proportion in my country's communication, electric power and national defense industries. With the development of optical communication systems towards higher speed and larger capacity, and the application of technologies such as Erbium-doped Fiber Amplifier (EDFA) and Dense Wavelength Division Multiplexing (DWDM) in optical fiber communication systems, the speed and capacity of optical fiber communication systems have been doubled in size. However, in the currently operating time-frequency synchronization network, it is difficult to achi...

AI Technical Summary

Problems solved by technology

The above-mentioned insurmountable technical bottleneck causes the change value of the optical fiber delay of the existing SDH and PTN communication networks to be unable to be adaptively controlled, and the defects of the original time synchronization technology make it impossible to improve the synchronization accuracy, especially when dense wavelength division multiplexing When (DWDM) technology is applied in the optical fiber communication system, the problem of high-precision time synchronization cannot be solved

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