CN106209218B - A kind of optical cable knowledge method for distinguishing based on thermotropic fiber polarization variation principle - Google Patents
A kind of optical cable knowledge method for distinguishing based on thermotropic fiber polarization variation principle Download PDFInfo
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- CN106209218B CN106209218B CN201610593798.4A CN201610593798A CN106209218B CN 106209218 B CN106209218 B CN 106209218B CN 201610593798 A CN201610593798 A CN 201610593798A CN 106209218 B CN106209218 B CN 106209218B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention discloses a kind of optical cables based on thermotropic fiber polarization variation principle to know method for distinguishing, characterized in that includes the following steps: that P-OTDR 1) is connected to identified optical cable；2) optical cable is selected to be heated at optical cable identification；3) first group of data D1 is obtained by P-OTDR；4) optical cable will be heated and is cooled to environment temperature；5) second group of data D2 is obtained by P-OTDR；6) coordinate of data D1 and data D2 are found；7) first 10dB point of data D2 is found out；8) data calculating, D '=D1-D2 are carried out；9) D ' is carried out returning 0 calculating, obtains D；10) whether the value for judging data D is more than threshold value, determines identified optical cable.This method can easily, fast and accurately identify target optical cable, and this method is easy to use, accurate positioning.
Description
Technical field
The present invention relates to optic communication testing fields, more particularly to a kind of light based on thermotropic fiber polarization variation principle
Cable knows method for distinguishing.
Background technique
Currently, be frequently encountered when safeguarding fiber cable network and exist simultaneously more optical cables in some pipelines, and due to
A variety of causes makes the mark of optical cable fall off, is smudgy, and in this case, in order to safeguard optical cable, maintenance personnel obtains first
Making which root optical cable clear is the optical cable oneself to be looked for, needs to identify optical cable at this time.
Optical cable is carried out there are mainly three types of knowledge method for distinguishing at present: tapping the side of optical cable using optic cable vibration sensor measuring
Formula is bent the mode of optical cable using P-OTDR, that is, polarization-optical time domain reflectometer detection, uses B-OTDR, that is, Brillouin-optical time domain
The mode of reflectometer detection heating optical cable.
Tap the mode of optical cable using optic cable vibration sensor measuring to carry out optical cable identification, disadvantage first is that being easy to produce string
It disturbs, needs to separate on each optical cable when several optical cables are held together, and identify optical cable, if the distance separated is only
There is 2-3m, then vibrating when tapping a wherein optical cable and being easy string to other optical cables, in this case, which root light distinguished
Cable is only the target optical cable that we need to find, will be relatively time-consuming, bothersome；Disadvantage second is that encountering lightguide cable link has overhead line
When section, when blowing hard or raining, because the noise that the factors such as optical cable friction hanging rod, hook generate is very big, at this time by making
Carrying out optical cable identification with the mode that optical cable vibrating sensing detects percussion optical cable will become extremely difficult；
The mode of bending optical cable is detected to carry out optical cable identification using P-OTDR, the disadvantage is that needing when identification optical cable will be each
Root optical cable is separated, and the bending of diameter 1m or so can be carried out to optical cable, if optical cable is laid at identification optical cable
It is relatively tight, the optical cable of sufficient length can not be taken out for being bent, then implementation optical cable bending is just relatively difficult, is visited by using P-OTDR
The mode of lateral bending song optical cable also just becomes to be inconvenient to carry out optical cable identification.
The mode of heating optical cable is detected using B-OTDR to carry out optical cable identification, although above two method can be avoided
Disadvantage, but B-OTDR's is at high cost, and single-ended detection range is difficult more than 60km.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, and provides and a kind of principle is changed based on thermotropic fiber polarization
Optical cable know method for distinguishing, this method can easily, fast and accurately identify target optical cable, and this method is easy to use, fixed
Level is true.
Realizing the technical solution of the object of the invention is:
A kind of optical cable knowledge method for distinguishing based on thermotropic fiber polarization variation principle, includes the following steps:
1) in one end of identified optical cable, wherein with identified optical cable by polarization sensitive optical time domain reflection instrument (P-OTDR)
A piece optical fiber connection；
2) the A point at optical cable identification, separates optical cable to be identified, wherein an identified optical cable will carry out being heated to 50
DEG C -70 DEG C, the length for the identified cable portion being heated is 0.3m-2m；
3) it is obtained by polarization sensitive optical time domain reflection instrument by first group of backscatter signal curve data D1 of even optical fiber, is surveyed
Measuring pulse width used is Tw1, time of measuring T1；
4) the A point at identified optical cable identification, is cooled to environment temperature for the identified cable portion being heated；
5) it is obtained by polarization sensitive optical time domain reflection instrument by second group of backscatter signal curve data D2 of even optical fiber, is surveyed
Measuring pulse width used is Tw2, time of measuring T2；
6) function coordinates that data D1 and data D2 is tested optical fiber backscatter signal amplitude and fiber lengths, Y are established
Axis indicates that backscatter signal amplitude, unit dB, 0dB value correspond to noise mean square root value；X-axis indicates fiber lengths；
7) it since the origin of X-axis, is calculated forward point by point along X-axis forward direction, finding out the 1st Y-axis range value in data D2 is
The point of 10dB, the value of corresponding X-axis are Xa；
8) data D1 and data D2 are subjected to additive operation, obtain signal data sequence D ', shown with curve mode
Signal data sequence D '；Establish signal data sequence D ' function coordinates, Y-axis indicate backscatter signal amplitude variation, X-axis
Indicate fiber lengths；
9) signal data sequence D ' function coordinates in, the value range of X-axis is limited to 0-Xa, the point definition of X=0
For coordinate origin, the value of all Y-axis subtracts the Y value of coordinate origin and takes absolute value, and obtains signal data sequence D；Establish letter
The function coordinates of number sequence D, Y-axis indicate amplitude difference of the backscatter signal amplitude before and after temperature change, and X-axis indicates light
Fine length；
10) the Y-axis value for calculating data sequence D, if there is the value for being more than threshold value Yt, it is believed that the optical cable being currently heated is
The target optical cable of searching, otherwise, the optical cable being currently heated are not the target optical cables found；Repeat 2) -10) step, until looking for
Until target optical cable.
Pulse width Tw1 and Tw2 are 40ns-320ns used in the measurement.
The time of measuring T1 and T2 is 1s-15s.
The value of the threshold value Yt is 0.3 dB -0.6dB.
The principle of this method is connected to polarization-optical time domain reflectometer on a wherein optical fiber for identified optical cable,
By optical cable to be identified, wherein an optical cable carries out being heated to 70 DEG C, before obtaining optical cable heating using polarization-optical time domain reflectometer
OTDR curve data afterwards handles two groups of OTDR curve datas of acquisition, and according to treated, result judges polarization-light
Whether the optical cable that time-domain reflectomer is connected is heated distally, so that whether the optical cable that judgement is heated is found target
Optical cable.
This method can easily, fast and accurately identify target optical cable, and this method is easy to use, accurate positioning.
Detailed description of the invention
Fig. 1 is optical cable recognition methods process blocks schematic diagram in embodiment；
Fig. 2 is the structural schematic diagram of measuring system in embodiment.
In figure, 1, polarization-optical time domain reflectometer 2. is identified optical cable.
Specific embodiment
The content of present invention is further elaborated below with reference to embodiment and attached drawing, but is not limitation of the invention.
Embodiment:
Referring to Fig.1, Fig. 2, a kind of optical cable knowledge method for distinguishing based on thermotropic fiber polarization variation principle, including walk as follows
It is rapid:
1) in one end of identified optical cable 2, it is such as identified the starting endpoint C of the optical cable 2 or distal point B of identified optical cable 2,
Polarization sensitive optical time domain reflection instrument 1 is connect with a wherein optical fiber for identified optical cable 2；
2) the A point at identified optical cable identification, separates optical cable to be identified, will wherein an identified optical cable be added
For heat to 50 DEG C -70 DEG C, the length for the identified cable portion being heated is 0.3m-2m；
3) it is obtained by polarization sensitive optical time domain reflection instrument 1 by first group of backscatter signal curve data D1 of even optical fiber,
Measuring pulse width used is Tw1, time of measuring T1；
4) the A point at identified optical cable identification, is cooled to environment temperature for the cable portion being heated；
5) it is obtained by polarization sensitive optical time domain reflection instrument 1 by second group of backscatter signal curve data D2 of even optical fiber,
Measuring pulse width used is Tw2, time of measuring T2；
6) function coordinates that data D1 and data D2 is tested optical fiber backscatter signal amplitude and fiber lengths, Y are established
Axis indicates that backscatter signal amplitude, unit dB, 0dB value correspond to noise mean square root value；X-axis indicates fiber lengths；
7) it since the origin of X-axis, is calculated forward point by point along X-axis forward direction, finding out the 1st Y-axis range value in data D2 is
The point of 10dB, the value of corresponding X-axis are Xa；
8) data D1 and data D2 are subjected to additive operation, obtain signal data sequence D ', shown with curve mode
Signal data sequence D '；Establish signal data sequence D ' function coordinates, Y-axis indicate backscatter signal amplitude variation, X-axis
Indicate fiber lengths；
9) signal data sequence D ' function coordinates in, the value range of X-axis is limited to 0-Xa, the point definition of X=0
For coordinate origin, the value of all Y-axis subtracts the Y value of coordinate origin and takes absolute value, and obtains signal data sequence D；Establish letter
The function coordinates of number sequence D, Y-axis indicate amplitude difference of the backscatter signal amplitude before and after temperature change, and X-axis indicates light
Fine length；
10) the Y-axis value for calculating data sequence D, if there is the value for being more than threshold value Yt, it is believed that the optical cable being currently heated is
The target optical cable of searching, otherwise, the optical cable being currently heated are not the target optical cables found；Repeat 2) -10) step, until looking for
Until target optical cable.
Pulse width Tw1 and Tw2 are 40ns-320ns used in the measurement.
The time of measuring T1 and T2 is 1s-15s.
The value of the threshold value Yt is 0.3 dB -0.6dB.
Claims (4)
1. a kind of optical cable based on thermotropic fiber polarization variation principle knows method for distinguishing, characterized in that include the following steps:
1) in one end of identified optical cable, by polarization sensitive optical time domain reflection instrument (P-OTDR) and wherein one of identified optical cable
Optical fiber connection；
2) the A point at optical cable identification, separates optical cable to be identified, will wherein an identified optical cable be heated to 50 DEG C-
70 DEG C, the length for the cable portion being heated is 0.3m-2m；
3) it is obtained by polarization sensitive optical time domain reflection instrument by first group of backscatter signal curve data D1 of even optical fiber, measures institute
It is Tw1, time of measuring T1 with pulse width；
4) the A point at identified optical cable identification, is cooled to environment temperature for the identified cable portion being heated；
5) it is obtained by polarization sensitive optical time domain reflection instrument by second group of backscatter signal curve data D2 of even optical fiber, measures institute
It is Tw2, time of measuring T2 with pulse width；
6) function coordinates that data D1 and data D2 is tested optical fiber backscatter signal amplitude and fiber lengths, Y-axis table are established
Show that backscatter signal amplitude, unit dB, 0dB value correspond to noise mean square root value；X-axis indicates fiber lengths；
7) it since the origin of X-axis, is calculated forward point by point along X-axis forward direction, finding out the 1st Y-axis range value in data D2 is 10dB
Point, the value of corresponding X-axis is Xa；
8) data D1 and data D2 are subjected to additive operation, obtain signal data sequence D ', display signal is carried out with curve mode
Data sequence D'；Establish signal data sequence D ' function coordinates, Y-axis indicate backscatter signal amplitude variation, X-axis indicate
Fiber lengths；
9) signal data sequence D ' function coordinates in, the value range of X-axis is limited to 0-Xa, the point of X=0 is defined as sitting
Origin is marked, the value of all Y-axis subtracts the Y value of coordinate origin and takes absolute value, carries out returning 0 calculating to D', obtain signal data
Sequence D；The function coordinates of signal data sequence D are established, Y-axis indicates amplitude of the backscatter signal amplitude before and after temperature change
Difference, X-axis indicate fiber lengths；
10) the Y-axis value for calculating data sequence D, if there is the value for being more than threshold value Yt, it is believed that the optical cable being currently heated is to find
Target optical cable, otherwise, the optical cable being currently heated be not find target optical cable；Repeat 2) -10) step, until finding mesh
Until marking optical cable.
2. the optical cable according to claim 1 based on thermotropic fiber polarization variation principle knows method for distinguishing, characterized in that
Pulse width Tw1 and Tw2 are 40ns-320ns used in the measurement.
3. the optical cable according to claim 1 based on thermotropic fiber polarization variation principle knows method for distinguishing, characterized in that
The time of measuring T1 and T2 is 1s-15s.
4. the optical cable according to claim 1 based on thermotropic fiber polarization variation principle knows method for distinguishing, characterized in that
The value of the threshold value Yt is 0.3dB-0.6dB.
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| CN108333700B (en) * | 2018-04-12 | 2023-11-28 | 金帆智华（北京）科技有限公司 | Optical cable identification device and method based on temperature change frequency |
| EP3817247B1 (en) * | 2019-10-28 | 2024-06-05 | Viavi Solutions France SAS | Optical fiber identification and distance measurement |
| US11703397B2 (en) | 2019-10-28 | 2023-07-18 | Viavi Solutions France SAS | Optical fiber identification and distance measurement |
| CN112924141A (en) * | 2021-02-05 | 2021-06-08 | 南京科舜通信科技有限公司 | Optical cable operating point positioning method and positioning device |
| CN116482699B (en) * | 2023-03-13 | 2024-01-23 | 无锡布里渊电子科技有限公司 | Temperature type optical cable positioning identification instrument and identification method |
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| CN1556384A (en) * | 2004-01-09 | 2004-12-22 | �Ϻ���ͨ��ѧ | Optical cable circuit failure point precision locating method |
| CN103618570A (en) * | 2013-11-27 | 2014-03-05 | 桂林聚联科技有限公司 | Optical cable recognition device and method |
| WO2015144199A1 (en) * | 2014-03-24 | 2015-10-01 | Prysmian S.P.A. | Method of measuring current distribution in high and medium voltage cables |
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