CN109004973A - A kind of OTDR capability evaluating device and method - Google Patents
A kind of OTDR capability evaluating device and method Download PDFInfo
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- CN109004973A CN109004973A CN201810725343.2A CN201810725343A CN109004973A CN 109004973 A CN109004973 A CN 109004973A CN 201810725343 A CN201810725343 A CN 201810725343A CN 109004973 A CN109004973 A CN 109004973A
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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
OTDR capability evaluating device of the invention, including OTDR and disk fill standard fiber, and there is standard fiber fiber connector, OTDR and standard fiber to be connected by the fiber connector of standard fiber.OTDR performance estimating method of the invention carries out fibre loss characteristic test using OTDR and standard fiber；OTDR is connected with the fiber connector of standard fiber one end, the fiber connector of the standard fiber other end is connected with fibre optical transmission mirror, carries out fiber lengths test；OTDR is connected with the fiber connector of standard fiber one end, the fiber connector of the standard fiber other end is connected with fiber-optic trap, carries out dynamic range, blind area test.OTDR capability evaluating device of the invention and method can be realized the function that the self performances such as test functions and dynamic range, blind area such as the length to OTDR, loss are detected, make whole device smaller and lighter under the premise of not influencing measuring accuracy, functional coverage face is wider.
Description
Technical field
The invention belongs to optical device detection technique fields, and in particular to a kind of OTDR capability evaluating device further relates to one
The method that kind assesses OTDR performance using the device.
Background technique
Optical time domain reflectometer (Optical Time Domain Reflectometer, abbreviation OTDR) is according to after light
It is made to scattering and Fresnel reflection principle, the rear orientation light generated when being propagated in a fiber using light obtains the letter of decaying
Breath understands the instrument of several performances such as uniformity, defect, fracture, the connector coupling of optical fiber by the analysis to experiment curv.
The instrument is generally used for the parameters such as measurement fiber lengths, elongatedness decaying, splicing loss, fiber failure point location, is optical cable
Essential tool in construction and monitoring, plays irreplaceable role during optical-fiber network is built and is safeguarded.
Therefore, to the test of OTDR, calibration and calibration operation with regard to extremely important.
Test, calibration and the calibrating of current country OTDR is mainly according to " JJG 959-2001 optical time domain reflectometer calibrating rule
Journey ", most of mechanism accepted standard devices are by fiber lengths, the loss standard device of the production of metering institute of China, the device
It is mainly made of three coiled optical fibers, two disks cooperation 2X2 coupler was tested for providing length value, a disk for providing loss value
Journey convenient reading.But the standard set-up there are volume and weights the shortcomings that larger, mechanical structure is not sufficiently stable；Other mechanism bases
In its principle, some improvement have been carried out to the standard set-up, such as has reduced by a disk and the fiber reel of loss value is provided, although this is one
Determine to reduce instruments weight in degree, but during actual test loss, needs to find out one section of meadow manually in length section
Between then handmarking, read it is relatively complicated, and this test mode result be easy by client query.
Summary of the invention
The purpose of the present invention is to provide a kind of OTDR capability evaluating devices, and not only structure is simply small and exquisite, and can be with
Cross to obtain more accurate test result.
The object of the invention is also to provide a kind of methods assessed using above-mentioned apparatus OTDR performance.
A kind of technical solution of the present invention is: a kind of OTDR capability evaluating device, including OTDR and disk fill standard
Optical fiber, the standard fiber both ends have fiber connector, and two fiber connectors are identical or different, the OTDR and mark
Quasi-fiber is connected by the fiber connector of standard fiber one end.
Further, the fiber connector of the other end of the standard fiber far from connection OTDR is connected with fiber reflection
Mirror.
Specifically, the fiber reflector is Sagnac style type or FRM type.
Further, the fiber connector of the other end of the standard fiber far from connection OTDR is connected with fiber-optic trap.
Further, the fiber-optic trap is class black matrix structure.
Specifically, the fiber-optic trap is graphite mould fiber-optic trap.
Another technical solution of the present invention is: a kind of OTDR performance estimating method, comprising steps of
There is provided OTDR, both ends have disc type standard fiber, fiber reflector and the fiber-optic trap of fiber connector；
When carrying out fibre loss characteristic test, OTDR is connected with the fiber connector of standard fiber one end, it is described
OTDR emits light pulse signal according to setup parameter, then according to OTDR screen display content acquisition fibre loss characteristic, and with
The fibre loss characteristic of the standard fiber of precognition is compared to the performance of assessment OTDR；
When carrying out fiber lengths test, OTDR is connected with the fiber connector of standard fiber one end, the standard light
The fiber connector of the fine other end is connected with fibre optical transmission mirror, and the OTDR emits light pulse signal according to setup parameter, then
Fiber lengths value is obtained according to OTDR screen display content, and is compared to assessment OTDR's with the standard fiber length of precognition
Performance；
When carrying out dynamic range, blind area being tested, OTDR is connected with the fiber connector of standard fiber one end, the mark
The fiber connector of the quasi-fiber other end is connected with fiber-optic trap, and the OTDR emits light pulse signal according to setup parameter, so
The performance of OTDR is assessed according to OTDR screen display content afterwards.
The beneficial effects of the present invention are: a kind of OTDR capability evaluating device of the invention and method fill standard light using disk
Fine, fiber reflector and fiber-optic trap can be realized as the test functions such as the length to OTDR, loss and dynamic range, blind
The function that the self performances such as area are detected keeps whole device smaller under the premise of not influencing measuring accuracy and operation difficulty
And it is lighter, functional coverage face is wider, and replaceable proven panel mounted optical fiber adapts to different clients demand, is alternatively arranged as
Module is integrated in other instruments, and the device can be used as the standard set-up of other optical tests equipment after calibration.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of OTDR capability evaluating device of the invention；
Fig. 2 is the map of a kind of fibre loss that generates on the OTDR of embodiment 1；
Fig. 3 is the map of another fibre loss that generates on the OTDR of embodiment 1；
Fig. 4 is the map of fiber lengths that generates on the OTDR of embodiment 2；
Fig. 5 is the map of a kind of dynamic range and blind area that generates on the OTDR of embodiment 3；
Fig. 6 is the map of another dynamic range and blind area that generates on the OTDR of embodiment 3.
In figure, 1. standard fibers, 2. fiber connectors, 3. fiber reflectors, 4. fiber-optic traps.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of OTDR capability evaluating device provided by the invention, structure is as shown in Figure 1, include OTDR (not shown) and disk
Fill standard fiber 1,1 both ends of standard fiber have fiber connector 2, two fiber connectors 2 can be identical or different, OTDR and
Standard fiber 1 is connected by the fiber connector 2 of 1 one end of standard fiber.
In use, OTDR under the control of accurate clock circuit, is sent out according to the parameter of setting from optical port to standard fiber 1
Light pulse signal is penetrated, OTDR is constantly reflected back from standard fiber 1 according to certain time interval from optical port reception later
Optical signal respectively carries out optical fiber according to the principle of backscattering (test is lost) and Fresnel reflection (test is reflected) corresponding
Test.
When testing fibre loss, OTDR is directly connect with standard fiber 1, and in light pulse signal transmitting, scattering is derived from light
Fine internal fine particle or uneven texture can be reflected and be absorbed to it, and when illumination is mapped on impurity, some particles will
Light-redirecting produces signal decaying and backscattering to different directions, and the backward echo of certain point can be in optical fiber
The distribution situation for reflecting optical power in optical fiber, the map shown by OTDR screen can test out the loss feelings of optical fiber
Condition.
When testing fiber lengths, the fiber connector 2 of the other end of the standard fiber 1 far from connection OTDR is also connected with light
Fine reflecting mirror 3.3 matching standard optical fiber 1 of fiber reflector can provide optical signal in the length in multistage path and loss magnitude.Specifically
Ground, fiber reflector 3 are Sagnac style type or FRM type.If only easily-testing, 3 type of fiber reflector can be selected
Sagnac style type is selected, manufacturing cost is lower and is able to satisfy testing requirement to a certain extent；If necessary to accurate test, optical fiber
Reflecting mirror 3 then selects FRM type, and performance is stablized, and insertion loss and Polarization Dependent Loss are lower, so that test result is more smart
Really.
When carrying out dynamic range, blind area project testing, the optical fiber connection of the other end of the standard fiber 1 far from connection OTDR
First 2 are then connected with fiber-optic trap 4, eliminate the noises such as stray light, unreal peak using fiber-optic trap 4, and dynamic range, blind area can be made to survey
It tries closer to perfect condition.Further, fiber-optic trap 4 is class black matrix structure.Specifically, fiber-optic trap 4 is graphite mould light
Fine ligh trap.
OTDR performance estimating method provided by the invention, comprising steps of
There is provided OTDR, both ends have disc type standard fiber, fiber reflector and the fiber-optic trap of fiber connector；
When carrying out fibre loss characteristic test, OTDR is connected with the fiber connector of standard fiber one end, it is described
OTDR emits light pulse signal according to setup parameter, then according to OTDR screen display content acquisition fibre loss characteristic, and with
The fibre loss characteristic of the standard fiber of precognition is compared to the performance of assessment OTDR；
When carrying out fiber lengths test, OTDR is connected with the fiber connector of standard fiber one end, the standard light
The fiber connector of the fine other end is connected with fibre optical transmission mirror, and the OTDR emits light pulse signal according to setup parameter, then
Fiber lengths value is obtained according to OTDR screen display content, and is compared to assessment OTDR's with the standard fiber length of precognition
Performance；
When carrying out dynamic range, blind area being tested, OTDR is connected with the fiber connector of standard fiber one end, the mark
The fiber connector of the quasi-fiber other end is connected with fiber-optic trap, and the OTDR emits light pulse signal according to setup parameter, so
The performance of OTDR is assessed according to OTDR screen display content afterwards.
Doing further specific description, following embodiments to appraisal procedure of the invention below by specific embodiment is
The present invention program is aided in illustrating, protection protection scope of the invention includes but is not limited to following embodiments.
Embodiment 1
The present embodiment is used to test the loss characteristic of optical fiber, and 1 both ends of disc type standard fiber are FC/PC connector, insertion
Loss≤0.2, one end of standard fiber 1 is connected by return loss >=50 with OTDR, and the other end is hanging, and group's folding of OTDR is arranged
The rate of penetrating is 1.4600, pulsewidth 100ns, average time 10s, opens OTDR and emits light pulse signal, by directly on OTDR
The parameter for changing attenuator is shown by the loss characteristic that the map on OTDR screen is fiber segment under recordable different conditions
Value, Fig. 2 and Fig. 3 are different conditions of the present embodiment in length 2.5km, wavelength 1310nm and length 2.5km, wavelength 1550nm
Under map, directly read the fibre loss that the upper left corner is shown, then carried out on the basis of the loss parameter of standard fiber 1
Compare performance when can assess OTDR test fibre loss.The present invention directly reads registration by OTDR, without in length section
Finding out one section of steady section manually, then hand labeled is manually read, and test effect is consistent with the device of metering institute of China production,
But easy to operate and visual result.
Embodiment 2
For the present embodiment for testing fiber lengths, it is FC/PC connector that disk, which fills 1 both ends of standard fiber, insertion loss≤
0.2, return loss >=50.One end that disk fills standard fiber 1 connects OTDR to be measured, and the other end connects fiber reflector 3.Setting
The group index of OTDR is 1.4600, pulsewidth 100ns, average time 30s；Fiber reflector 3 is light reflective type device, FRM
Type and Sagnac style type, the Sagnac style type fiber reflector matching standard light for selecting performance slightly weak in the present embodiment
Fine analog optical signal and provides corresponding magnitude in the length in multistage path.Emit light pulse signal using OTDR, is then shielding again
Length value is read on curtain, is compared with 1 length of standard fiber and its integral multiple length, each point error of indication is calculated.
Standard fiber cooperates fiber reflector 3 to form type optical fiber cavity resonator structure, light is in class chamber knot as each parameter benchmark
It constantly reflects and is lost in structure, to form multiple reflection peaks that amplitude gradually decreases on OTDR analysis curve.The present embodiment
Test results are shown in figure 4, and map is that optical signal emits the curve generated after circulation through OTDR repeatedly in optical fiber, with JJG
The Tupu type that 959-2001 internal standard standard apparatus provides is consistent.It is successively read the position of the rising edge at each peak in curve, is tested
As a result the technical indicator of instrument producer offer is provided.Since the measurement process of the present embodiment only uses a coiled optical fiber, measurement is uncertain
It spends smaller.
Embodiment 3
Performance of the present embodiment for testing dynamic range, blind area project testing, in terms of acquisition precision and noise control.Into
When Mobile state range test, by dynamic range shown by OTDR, fore-and-aft distance should be greater than setting under the pulse width accordingly set
Fixed signal strength, for example, communication class user may require that OTDR setting maximum pulse width in the case where, dynamic range should be greater than 30dB.
And when carrying out blind area test, by blind area shown by OTDR, lateral distance should be less than setting under the pulse width accordingly set
Set a distance, for example, communication class user may require that OTDR setting minimum pulse width in the case where, Event Dead Zone should be less than 3m, decaying blind area
It should be less than 5m.It is wanted by the measurement range size of OTDR parameter relevant with minimum resolution capability to judge whether indicating value meets
It asks.
In the present embodiment, it is FC/PC connector, insertion loss≤0.2, return loss >=50 that disk, which fills 1 both ends of standard fiber,.
One end that disk fills standard fiber 1 connects OTDR to be measured, and one end connects fiber-optic trap 4.Fiber-optic trap 4 is light absorption type device, tail
End is class black matrix material, and the present embodiment selects graphite mould fiber-optic trap matching standard optical fiber to provide dynamic range, blind area parameter
Test environment.Test result is as shown in Figure 5, Figure 6, backscatter signals curve extrapolation is intersected with power shaft, intersection point is made an uproar the bottom of with
Between fore-and-aft distance/power difference be denoted as the dynamic range under the state；OTDR shows the background rail that trajector deviation is not disturbed
Mark is more than given ordinate 0.5dB, and lateral distance/length when reading left rising edge to right side failing edge 0.5dB is denoted as the shape
Decaying blind area under state；OTDR, which is shown, to be reflected on track between two points on signal traces lower than reflection peak point 1.5dB
Lateral distance/length is denoted as the Event Dead Zone under the state；The pulse width being arranged on dynamic range and blind area and OTDR is in just
Relevant relationship, test obtain accordingly result under fixed pulse width, wavelength, average time.
Claims (7)
1. a kind of OTDR capability evaluating device, which is characterized in that fill standard fiber, the standard fiber both ends including OTDR and disk
With fiber connector, two fiber connectors are identical or different, and the OTDR and standard fiber pass through standard fiber one
The fiber connector at end is connected.
2. a kind of OTDR capability evaluating device as described in claim 1, which is characterized in that the standard fiber is far from connection
The fiber connector of the other end of OTDR is connected with fiber reflector.
3. a kind of OTDR capability evaluating device as claimed in claim 2, which is characterized in that the fiber reflector is Sagnac
Style type or FRM type.
4. a kind of OTDR capability evaluating device as described in claim 1, which is characterized in that the standard fiber is far from connection
The fiber connector of the other end of OTDR is connected with fiber-optic trap.
5. a kind of OTDR capability evaluating device as claimed in claim 4, which is characterized in that the fiber-optic trap is class black matrix knot
Structure.
6. a kind of OTDR capability evaluating device as described in claim 4 or 5, which is characterized in that the fiber-optic trap is graphite
Type fiber-optic trap.
7. a kind of OTDR performance estimating method, which is characterized in that comprising steps of
There is provided OTDR, both ends have disc type standard fiber, fiber reflector and the fiber-optic trap of fiber connector；
When carrying out fibre loss characteristic test, OTDR is connected with the fiber connector of standard fiber one end, the OTDR is pressed
According to setup parameter emit light pulse signal, then according to OTDR screen display content obtain fibre loss characteristic, and with precognition
The fibre loss characteristic of standard fiber is compared to the performance of assessment OTDR；
When carrying out fiber lengths test, OTDR is connected with the fiber connector of standard fiber one end, the standard fiber is another
The fiber connector of one end is connected with fibre optical transmission mirror, and the OTDR emits light pulse signal according to setup parameter, then basis
OTDR screen display content obtains fiber lengths value, and the property of assessment OTDR is compared to the standard fiber length of precognition
Energy；
When carrying out dynamic range, blind area being tested, OTDR is connected with the fiber connector of standard fiber one end, the standard light
The fiber connector of the fine other end is connected with fiber-optic trap, and the OTDR emits light pulse signal according to setup parameter, then root
The performance of OTDR is assessed according to OTDR screen display content.
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| CN112769471A (en) * | 2019-11-01 | 2021-05-07 | 华为技术有限公司 | Optical fiber testing method based on optical time domain reflectometer and optical time domain reflectometer |
| CN113783608A (en) * | 2021-09-26 | 2021-12-10 | 中电科思仪科技股份有限公司 | Long-distance programmable optical fiber cable loss distribution testing device and method |
| WO2024001542A1 (en) * | 2022-06-30 | 2024-01-04 | 中兴通讯股份有限公司 | Otdr trace correction method, electronic device, and storage medium |
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