Unlock instant, AI-driven research and patent intelligence for your innovation.

Relayed submarine optical cable disturbance monitoring system for two paths of phase difference return signals

A submarine optical cable and monitoring system technology, applied in transmission systems, electromagnetic wave transmission systems, optical multiplexing systems, etc., can solve the problems of inability to realize phase information signal demodulation, insufficient information to be analyzed, and failure to support optical fiber interferometer transmission And other issues

Pending Publication Date: 2020-03-27
NO 34 RES INST OF CHINA ELECTRONICS TECH GRP
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution does not support the transmission of the output signal of the fiber optic interferometer based on the 3×3 fiber coupler, so it cannot realize signal demodulation including phase information, and there is a problem of insufficient information to be analyzed in the pattern recognition of the fiber optic cable disturbance signal type question

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Relayed submarine optical cable disturbance monitoring system for two paths of phase difference return signals
  • Relayed submarine optical cable disturbance monitoring system for two paths of phase difference return signals
  • Relayed submarine optical cable disturbance monitoring system for two paths of phase difference return signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0037] This example is similar to Example 1 in basic structure.

[0038] In this example, the length of the downlink transmission optical fiber of each relay section is 100 km.

[0039] The fiber interferometer in this example is MZ fiber interferometer (Mach-Zehnder interferometer, Mach-Zehnder interferometer), such as image 3 As shown, a fiber interferometer including a fiber splitter, a fiber circulator and a 3×3 fiber coupler, the splitting ratio of the fiber splitter is 1 / 9, and the detection optical signal is divided into 2 paths at the fiber splitter, where One optical signal with a large splitting ratio is connected to the first port ① of the optical fiber circulator, and then output from the second port ② of the optical fiber ring, and connected to the downlink transmission fiber to continue downlink; the optical signal with a small splitting ratio output by the fiber splitter is used as a local The optical signal is connected to the 3×3 fiber coupler through the depo...

Embodiment 3

[0042] The basic structure of this example is similar to that of Embodiment 2, but the disturbance monitoring branch of the branch sea optical cable is added. Figure 4 Shown is a schematic structural diagram of a trunk section of the trunk submarine optical cable. The branch equipment connected to the trunk section is connected to two branch submarine optical cables. The detection optical signal of the detection light source is correspondingly increased by 2 wavelengths for the branch submarine optical cable. Disturbance monitoring, the detection optical signal is divided into 2 paths at the 1×2 optical fiber splitter of the branch equipment, one path continues downlink transmission along the downlink transmission fiber of the backbone submarine optical cable, and the other path downlink wavelength division multiplexer downlinks the DWDM of each branch subsea The detection optical signal of the optical cable is wavelength-decomposed and wavelength-division-multiplexed to the d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a relayed submarine optical cable disturbance monitoring system for two paths of phase difference return signals. Frequency modulation detection optical signals of a detectionlight source enter a downlink transmission optical fiber through a downlink relay amplifier and an optical fiber interferometer. A backward Rayleigh scattering signal generated by the detection optical signal in each relay section optical fiber is coherent with a local optical signal in the optical fiber interferometer; and two paths of disturbance monitoring signals of the submarine optical cable of the relay section are generated, are multiplexed by a filter and an optical fiber coupler of the relay section respectively, enter two uplink transmission optical fibers, are subjected to relay transmission by an uplink relay amplifier, and are transmitted back to demodulation equipment. And the demodulation equipment distinguishes the disturbance monitoring signals of each section accordingto wavelength or pulse leading edge time, distinguishes the disturbance monitoring signals of different phase differences of the same relay section according to two different uplink transmission optical fibers, analyzes and demodulates the data, and early warns the safety state of each section of submarine optical cable. According to the invention, the false alarm rate of cross-relay relay submarine optical cable disturbance monitoring based on the OFDR technology is reduced.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a shore-based detection system for long-span physical security monitoring, wavelength division multiplexing, time division multiplexing combined with space division multiplexing uplink transmission of disturbance monitoring signals A relayed submarine optical cable disturbance monitoring system for two-way phase difference return signals. Background technique [0002] Submarine optical cable is a communication transmission cable laid on the seabed and is an important part of the Internet and other underwater optical networks. However, submarine optical cables are easily damaged, such as earthquakes, ship anchors and fishing nets, etc. may damage submarine optical cables, and may even be damaged by humans. At present, each section of an electrically relayed submarine optical cable is connected with a relay amplifier to compensate the transmission loss of the optical s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B10/071H04B10/079H04J14/02
CPCH04B10/071H04B10/0795H04J14/0201
Inventor 岳耀笠唐超王航陈家雄
Owner NO 34 RES INST OF CHINA ELECTRONICS TECH GRP