Long-distance optical fiber detecting method, apparatus, device and system, and storage medium

Patent metadata

Field	Value
Publication number	US-11901937-B2
Application number	US-202017907248-A
Country	US
Kind code	B2
Filing date	Dec 28, 2020
Priority date	Apr 10, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

Disclosed are a long-distance optical fiber detecting method, apparatus, device and system, and a storage medium. The method comprises: in response to a detection request of a target node on a to-be-detected optical fiber, determining a first and second sampling sequence that are formed by respectively propagating, on said optical fiber, a first and second optical signal respectively sent from each end of the optical fiber through an OTDR; determining a total length of the optical fiber; generating a detection result according to the first and second sampling sequence and the total length, and sending the detection result to the target node. By determining the first and second sampling sequence and combining the total length of the optical fiber, a detection result of the to-be-detected optical fiber is generated.

First claim

What is claimed is:

1. A long-distance optical fiber detecting method, comprising:
in response to a detection request of a target node on a to-be-detected optical fiber, determining a first sampling sequence and a second sampling sequence that are formed by respectively propagating, on the to-be-detected optical fiber, a first optical signal and a second optical signal respectively sent from each end of the to-be-detected optical fiber by an OTDR;
determining a total length of the to-be-detected optical fiber;
generating a detection result according to the first sampling sequence, the second sampling sequence, and the total length; and
sending the detection result to the target node,
wherein the determining the total length of the to-be-detected optical fiber comprises:
determining a sending time of a third optical signal recorded by a sending node; the third optical signal being used for measuring the to-be-detected optical fiber;
determining a receiving time of the third optical signal recorded by a receiving node;
determining a propagation duration of the third optical signal on the to-be-detected optical fiber according to the sending time and the receiving time; and
determining the total length of the to-be-detected optical fiber according to the propagation duration.

2. The method of claim 1 , wherein the determining a sending time of a third optical signal recorded by a sending node comprises: sending, by a local end node used as the sending node, the third optical signal to an opposite end node, and recording a time stamp of sending the third optical signal as the sending time; correspondingly, the determining a receiving time of the third optical signal recorded by a receiving node comprises: receiving, by the local end node, the receiving time sent by the opposite end node used as the receiving node;
or,
the determining a sending time of a third optical signal recorded by a sending node comprises: receiving, by a local end node, the sending time sent by an opposite end node; correspondingly, the determining a receiving time of the third optical signal recorded by a receiving node comprises: receiving, by the local end node used as the receiving node, the third optical signal, and recording a time stamp of receiving the third optical signal as the receiving time.

3. The method of claim 1 , wherein after generating the detection result according to the first sampling sequence, the second sampling sequence and the total length, the method further comprises:
in a case where the detection result does not meet a preset condition, determining a third sampling sequence and a fourth sampling sequence that are formed by respectively propagating, on the to-be-detected optical fiber, a fourth optical signal and a fifth optical signal sent from each end of the to-be-detected optical fiber by a third ODTR and a fourth OTDR respectively disposed at each end of the to-be-detected optical fiber, wherein a sum of dynamic ranges of the third optical time-domain reflectometer and the fourth optical time-domain reflectometer is larger than a sum of dynamic ranges of the OTDRs sending the first and second optical signals;
regenerating an update detection result according to the third sampling sequence, the fourth sampling sequence and the total length;
sending the update detection result to the target node.

4. The method according to claim 1 , wherein
the first sampling sequence is a sequence composed of corresponding optical power relative values recorded by the first optical signal at each sampling point of the to-be-detected optical fiber;
the second sampling sequence is a sequence composed of corresponding optical power relative values recorded by the second optical signal at each sampling point of the to-be-detected optical fiber.

5. The method of claim 4 , wherein the first sampling sequence is obtained by sampling the first optical signal sent by a sending node, and the second sampling sequence is obtained by sampling the second optical signal sent by a receiving node, and sampling points in the first sampling sequence and the second sampling sequence are numbered from the sending node to the receiving node in an increasing sequence, respectively;
correspondingly, the generating a detection result according to the first sampling sequence, the second sampling sequence and the total length comprises:
determining a ratio between ½ of the total length and a distance between two adjacent sampling points;
in a case where a serial number of a sampling point in the first sampling sequence is less than the ratio, adding the sampling point to a first sampling subsequence of the first sampling sequence;
analyzing the first sampling subsequence, so as to obtain a first detection sub-result;
in a case where a serial number of a sampling point in the second sampling sequence is larger than or equal to the ratio, adding the sampling point to a second sampling subsequence of the second sampling sequence;
analyzing the second sampling subsequence, so as to obtain a second detection sub-result;
generating a detection result according to the first detection sub-result and the second detection sub-result.

6. The method of claim 5 , wherein the generating a detection result according to the first detection sub-result and the second detection sub-result comprises:
determining an adjacent optical power attenuation value of the first optical signal or the second optical signal between the two adjacent sampling points;
determining a third detection sub-result according to the second detection sub-result and the adjacent optical power attenuation value;
generating the detection result according to the first detection sub-result and the third detection sub-result.

7. A long-distance optical fiber detecting device, comprising: two optical time-domain reflectometer OTDR modules disposed at each end of a to-be-detected optical fiber, and a long-distance optical fiber detecting apparatus, wherein:
in response to a detection request of a target node on the to-be-detected optical fiber, one of the two OTDR modules sends a first optical signal and obtains a first sampling sequence formed by propagating the first optical signal on the to-be-detected optical fiber, or, an other of the two OTDR modules sends a second optical signal and obtains a second sampling sequence formed by propagating on the to-be-detected optical fiber;
the long-distance optical fiber detecting apparatus includes a response module, a determining module, a generating module, and a sending module, wherein the response module responds to the detection request of the target node on the to-be-detected optical fiber, determines the first sampling sequence and the second sampling sequence formed by respectively propagating the first and second optical signals on the to-be-detected optical fiber; the determining module determines a total length of the to-be-detected optical fiber; the generating module generates a detection result according to the first sampling sequence, the second sampling sequence and the total length; and the sending module sends the detection result to the target node,
wherein the determining the total length of the to-be-detected optical fiber comprises:
determining a sending time of a third optical signal recorded by a sending node; the third optical signal being used for measuring the to-be-detected optical fiber;
determining a receiving time of the third optical signal recorded by a receiving node;
determining a propagation duration of the third optical signal on the to-be-detected optical fiber according to the sending time and the receiving time; and
determining the total length of the to-be-detected optical fiber according to the propagation duration.

8. A non-tran

Assignees

• Accelink Tech Co Ltd

Inventors

• Zhou Qi
• Xiong Tao
• Yu Chunping
• Bu Qinlian

Classifications

• H04B10/071 Primary

  using a reflected signal, e.g. using optical time domain reflectometers [OTDR] · CPC title

• G01M11/3145

  Details of the optoelectronics or data analysis · CPC title

• G01M11/39

  in which light is projected from both sides of the fiber or waveguide end-face · CPC title

• G01M11/3118

  using coded light-pulse sequences · CPC title

• G01B11/02

  for measuring length, width or thickness (G01B11/08 takes precedence) · CPC title