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Fiber time frequency and data joint transmission system and method

By using sub-bands within the standard OSC band to transmit time-frequency signals and optical monitoring signals in an optical fiber time-frequency and data joint transmission system, and multiplexing with optical communication data services through CWDM modules, the existing technology for optical fiber time-frequency transmission is solved. It solves the problems of high accuracy and cost and achieves high-precision and wide-range transmission and efficient utilization of wavelength resources.

Active Publication Date: 2019-09-06
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will not only lead to an increase in implementation costs, but also cause the interruption of original communication services, which will have a great impact on communication operators and user services
Furthermore, this method occupies the coarse wavelength division band that can be used for communication services. With the rapid growth of communication services, wavelength resources are becoming increasingly tight, and the limitations of this method are becoming more and more obvious.

Method used

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Embodiment 1

[0098] In this embodiment, the bidirectional time signal is transmitted by using the wavelength not covered by the commercial optical monitoring signal sending optical module in the OSC band. In this embodiment, the division method of the OSC band is as follows figure 2 (a) shown. 1500nm-1520nm is one of the optional OSC bands stipulated by ITU standard G.692. The wavelength of the optical monitoring signal is within the 1503.5nm-1516.5nm sub-band. This sub-band (1503.5nm-1516.5nm) coincides with the working wavelength range of most existing commercial optical monitoring signal sending optical modules. Both the forward time signal and the backward time signal are carried by the 1511nm CWDM module (that is, the local terminal combiner / demultiplexer 106, the first combiner / demultiplexer 410, the second combiner / demultiplexer 412, the remote combiner / demultiplexer On the wavelength 1517nm that is not covered by the optical monitoring signal sub-band (1503.5nm-1516.5nm) within...

Embodiment 2

[0110] In this embodiment, the division method of the OSC band is as follows figure 2 (b) shown. 1500nm-1520nm is one of the OSC bands specified in ITU standard G.692, and 1503.5nm-1516.5nm is the wavelength range of the existing commercial optical monitoring signal optical transmission module. The wavelength of the optical monitoring signal is within the range of 1506.5nm-1513.5nm, which is smaller than the wavelength range of 1503.5nm-1516.5nm of most existing commercial optical monitoring signal sending optical modules. The forward time signal and the backward time signal are carried in the 1511nm CWDM module (namely, the local terminal combiner / demultiplexer 106, the first combiner / demultiplexer 410, the second combiner / demultiplexer 412, the remote combiner / demultiplexer 206) The working wavelength range (1503.5nm-1518.5nm specified by the standard) is not covered by the optical monitoring signal wavelength range (1506.5nm-1513.5nm) at the wavelength of 1515nm, and the ...

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Abstract

The invention discloses a fiber time frequency and data joint transmission system and method. The system comprises a local end, a relay node and a remote end. The local end, the relay node and the remote end realize time frequency signals, optical monitoring signals and wave splitting and combining of optical communication data services through a CWDM module and an OSC wave band wave combiner / splitter, and realize processing such as sending, relaying and receiving through respective corresponding processing modules, thereby realizing combined transmission. The time frequency signal is transmitted by using the sub-band of the OSC band, so that the transmission of the optical monitoring signal is not influenced, additional band resources are not occupied, the utilization rate of wavelength resources is higher, and the cost is lower. Meanwhile, the bidirectional time frequency transmission wavelength is within the sub-band of the OSC band, flexible selection and combination can be achieved, different application and system requirements can be met, and the bidirectional time frequency transmission wavelength can be very close to or even the same, so that the bidirectional symmetry of the link is guaranteed to the maximum extent, and the time frequency transmission precision is improved.

Description

technical field [0001] The invention relates to joint transmission of optical fiber time frequency and communication data, in particular to a system and method for joint transmission of optical fiber time frequency and communication data used in WDM system. Background technique [0002] High-precision time-frequency references play an important supporting role in satellite navigation, precision surveying, geological surveying and mapping, time-frequency systems, and deep space exploration. At present, time-frequency transmission technologies based on free-space channels, such as GPS common view and satellite two-way time-frequency comparison, due to the interference of environmental factors on free-space transmission links, the accuracy of time transmission can only reach the ns level, and the accuracy of frequency transmission Stability can only reach 10 -15 / day, which cannot meet the needs of high-precision time-frequency transmission and synchronization. [0003] Optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/11H04B10/29H04B10/297
CPCH04B10/11H04B10/25H04B10/29H04B10/297H04B2210/078H04J14/0275H04J14/08H04B10/2589
Owner SHANGHAI JIAOTONG UNIV
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