A Method of Transmitting Time-Frequency Signals in Optical Fiber Using Polarized Light

Abstract

The invention discloses a method for transmitting a time-frequency signal in an optical fiber through polarized light. A single-fiber bidirectional optical fiber time transmission scheme acts as the basis; and two linearly polarized light of the same wavelength is applied to transmit the time signal on the back-and-forth optical fiber link so that the influence of the delay asymmetry caused by theoptical fiber dispersion introduced in the back-and-forth optical fiber link in case of using two light of different wavelengths to transmit the time signal can be overcome, the accuracy of optical fiber time signal transmission can be enhanced, and the time synchronization accuracy between the master and slave stations is enabled to be the subnanosecond level and even higher.

Description

technical field [0001] The invention relates to the technical field of optical fiber time-frequency transmission, in particular to a method for transmitting time-frequency signals in an optical fiber by using polarized light. Background technique [0002] With the development of communication technology, optical fiber communication network is developing towards the direction of high speed, large capacity and low delay. Therefore, the requirements for the time and frequency synchronization accuracy of the optical fiber communication network are correspondingly increased. The existing optical fiber time transfer technology mainly adopts dual-fiber bidirectional and single-fiber bidirectional transmission methods. In the dual-fiber bidirectional optical fiber time transfer scheme, the IEEE 1588v1 and IEEE 1588v2 time synchronization standards issued by the IEEE organization are usually used. Due to the influence of the number of hops of optical fiber network nodes and the tra...

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Problems solved by technology

[0005] It can be seen from Table 1 that: near the wavelength of 1550nm, the group delay difference after two wavelengths with an interval of 0.4nm transmission for 1000 kilometers can reach 6.6ns, that is, the asymmetry of the transmission link caused by dispersion can reach 6.6ns. The introduced delay asymmetry will have a serious impact on the accuracy of optical fiber time transfer, making it difficult to further improve the accuracy of optical fiber time transfer

[0006] To sum up, it is difficult to achieve sub-nanosecond and higher-precision fiber-optic time transfer technology, whether it is dual-fiber bi-directional or single-fiber bi-directional optical time transfer technology.

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