CN105790828B - Inhibit the device and optical link detection method of light reflection - Google Patents
Inhibit the device and optical link detection method of light reflection Download PDFInfo
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- CN105790828B CN105790828B CN201410806555.5A CN201410806555A CN105790828B CN 105790828 B CN105790828 B CN 105790828B CN 201410806555 A CN201410806555 A CN 201410806555A CN 105790828 B CN105790828 B CN 105790828B
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Abstract
The present invention discloses a kind of device and optical link detection method inhibiting light reflection.The device includes：The ceramic insertion core of the end faces UPC, the output port for connecting optical branching device open circuit, the ceramic insertion core of APC end face are removably connect with the ceramic insertion core of the end faces UPC, for absorbing reflected light signal.The device and optical link detection method provided by the invention for inhibiting light reflection, inhibits the device of light reflection by being installed on optical branching device, absorbs OTDR reflected light signals, reduces reflectivity when OTDR detections, to reduce the blind area of OTDR detections.
Description
Technical field
The present invention relates to optical communication field more particularly to a kind of devices and optical link detection method inhibiting light reflection.
Background technology
OTDR (Optical Time Domain Reflectometer, optical time domain reflectometer) is a kind of photoelectricity of precision
Integrated instrument, backscattering caused by the Rayleigh scattering and Fresnel reflection when being transmitted in a fiber using light measure with
Optical link is diagnosed, it is widely used among the maintenance of lightguide cable link, construction, can carry out fiber lengths, transmission attenuation, connector
The measurement of decaying and fault location etc..
In PON (Passive Optical Network, passive optical-fiber network) optical access network system, due to ODN
(Optical Distribution Node, Optical Distribution Node) introduces optical branching device, and optical branching device connects branch optical fiber, point
OTDR tests light pulse signal and significantly decays on branch optical fiber.ODN optical links are carried out when using optical time domain reflectometer (OTDR)
When fault detection and diagnosis, once optical branching device output port has the case where open circuit, very strong reflection will be generated, cause to generate very
Big OTDR check frequencies, so that OTDR can not detect the wear-out failure event on certain distance branch optical fiber thereafter.
Therefore, it is necessary to provide it is a kind of elimination optical branching device output port open circuit caused by OTDR check frequencies device or
Method, to improve effects of the OTDR to branch optical fiber fault detect after splitter.
Invention content
The disclosure technical problem to be solved is how to provide a kind of elimination optical branching device output port open circuit to cause
OTDR check frequencies device, to improve effects of the OTDR to branch optical fiber fault detect after splitter.
The disclosure provides a kind of device inhibiting light reflection, including：
The ceramic insertion core of the end faces UPC, the output port for connecting optical branching device open circuit,
The ceramic insertion core of APC end face is removably connect with the ceramic insertion core of the end faces UPC, for absorbing reflected light signal.
Further, the device of the inhibition light reflection includes：Plug, the output port for connecting optical branching device open circuit.
Further, which is SC connectors.
Further, the device of the inhibition light reflection further includes pre-buried optical fiber, the ceramic insertion core through the end faces UPC and insertion
In the ceramic insertion core of APC end face.
Further, which is connected with the output optical fibre in the output port of the open circuit of the optical branching device.
Further, the device of the inhibition light reflection further includes carrying out closure protection for the ceramic insertion core to APC end face
Protection sleeve pipe.
Further, after ceramic insertion core and the built-in pre-buried optical fiber of dismantling APC end face, inhibit the device conduct of light reflection
Rapid mechanical connector is used for optical fiber Cheng Duan.
The disclosure also provides a kind of optical link detection method, including：
By the device of the inhibition light reflection on the output port that optical branching device is opened a way, OTDR detections are being carried out
When inhibit OTDR detection signal reflection.
The device and optical link detection method for the inhibition light reflection that the disclosure provides, which includes the ceramics of the end faces UPC
Lock pin, for connect optical branching device open circuit output port, the ceramic insertion core of APC end face, removably with the ceramics of the end faces UPC
Lock pin connects, and for absorbing reflected light signal, inhibits the device of light reflection by being installed on optical branching device, absorbs reflected light letter
Number, reflectivity when OTDR detections is reduced, to reduce the blind area of OTDR detections.
Description of the drawings
Fig. 1 shows the structural schematic diagram of the device of the inhibition light reflection of one embodiment of the invention.
Fig. 2 is the structural schematic diagram that the optical branching device output port of one embodiment of the invention is opened a way.
Fig. 3 shows that the output port connection of the optical branching device open circuit of one embodiment of the invention inhibits the structure of light reflecting device
Schematic diagram.
Fig. 4 shows the optical branching device output port open circuit OTDR experiment curv schematic diagrames of one embodiment of the invention.
It is bent that Fig. 5 shows that the optical branching device output port connection of one embodiment of the invention inhibits the OTDR of light reflecting device to measure
Line schematic diagram.
Specific implementation mode
With reference to the accompanying drawings to invention is more fully described, wherein illustrating exemplary embodiment of the present invention.
OTDR is by emitting one or more ultrashort pulse and detected reflectance signal realization into optical link to optical link
The detection and positioning of failure, detection rely on the spike (reflection) in reflection signal or sink (decaying), and positioning then relies on reflection
Spike and sagging time in signal (time is directly proportional to position occurs).In practical application scene, based on OTDR's
Optical link is measured and is diagnosed mainly for detection of the decay events or reflection event in optical communication system.For example, when external force is pressed in
On optical cable or personnel's maloperation causes excessive fiber to be bent, and can detect decay events by OTDR at this time.When optical fiber is disconnected
It when splitting, is detected by OTDR, can detect the reflection event of the end face broken to form.
Optical branching device output port generally uses the end faces UPC (spherical surface) connector, single output port once to open a way, can shape
At the reflection of -14dB or so, and multiple open circuit ports superposition reflective is stronger.And strong reflection can cause OTDR detectors for a period of time
It is interior effectively to detect other any weak reflection signals, cause OTDR check frequencies.
The main device by the installation inhibition reflection on the output port of each open circuit of optical branching device of the present invention, from
And the strong reflection of port open generation is substantially reduced, reduce OTDR check frequencies.
Fig. 1 shows the structural schematic diagram of the device of the inhibition light reflection of one embodiment of the invention.As shown in Figure 1, the device
Include mainly：
The ceramic insertion core 102 of UPC (Ultra Physical Contact, ultra physical end face) end face 105, for connecting
The output port of optical branching device open circuit；The ceramics of APC (Angled Physical Contact, angle physics end face) end face 107
Lock pin 103 is removably connect with the ceramic insertion core of the end faces UPC 105 102, for absorbing reflected light signal.In this way, by
Optical branching device side output port installs the inhibition light reflecting device, can utilize APC end face 107 (inclined-plane) that can effectively absorb strong anti-
The characteristics of penetrating optical signal reduces reflected light, so as to inhibit strong reflection.
In one embodiment, this can be made by increasing the ceramic insertion core on the inclined-planes APC on the basis of mechanical connector
Inhibit light reflecting device, the ceramic insertion core on the inclined-planes APC is dismountable, if the ceramic insertion core on the inclined-planes dismounting APC can be used as quickly
Mechanical connector carries out branch optical fiber and is connected at end.
The device for inhibiting reflection can be mounted on the output port that each optical branching device is respectively opened a way in practical application.It should
Device one end is that SC/UPC connectors are connect with existing optical branching device output port, in this way by inhibiting the device of reflection to divide light
The output port termination that road device is opened a way originally makes the port of original optical branching device open circuit be closed and no longer opens a way.And the device is another
Output port is the ceramic insertion core on the inclined-planes APC, i.e., the output port after optical branching device output port is terminated is that APC end face is (oblique
Face).OTDR detection optical signals encounter the inclined-planes APC back reflection light and are largely absorbed, it is suppressed that the reflection of OTDR detection lights, at this time
Reflectivity is -60dB or so, to reduce the blind area of OTDR detections.
In one embodiment, which further includes plug, and the output port for connecting optical branching device open circuit, plug can be with
Fastening inhibits the device of light reflection to the output port of optical branching device.
In one embodiment, the plug of the output port of connection optical branching device open circuit is SC connectors 101.
Optical branching device output port is mainly with SC (Square in the current light net of telecom operators at home
Connector, Square Connector) based on connector, the end face of SC plug body rectangles, contact pin mostly uses the grinding of UPC or APC types
Mode；Fastening means is to use insert-pull pin bar-type, is not required to rotate, and such connector is cheap, and plug is easy to operate, intervention damage
Consumption fluctuation is small, and compression strength is higher, and packing density is high.It should be noted that although the present invention is using SC connectors as embodiment introduction
The type of connector, but the invention is not restricted to this, if optical branching device uses FC, SC, ST, MU, LC, MT-RJ, MPO, MPX
When output port, then the joint categories for changing the device for inhibiting light reflection is needed, with the output port type phase with optical branching device
It adapts to.
In one embodiment, pre-buried optical fiber 106 is connected with the output optical fibre in the output port of the open circuit of optical branching device,
In this way can will the soft exchange of the output port of the open circuit of optical branching device to inhibit light reflection device in.
In one embodiment, which further includes pre-buried optical fiber, through the end faces UPC ceramic insertion core and be inserted into APC end face
Ceramic insertion core in.The pre-buried optical fiber 106 and the end face of ceramic insertion core 102 or ceramic insertion core 103 are substantially flush, in this way with light
When the output port of splitter is connected, it is ensured that output optical fibre and pre-buried optical fiber can preferably link together.
In one embodiment, reflectivity can be selected to form the suppression for the ceramic insertion core of the APC end face of -50dB to -70dB
Light reflecting device processed.
In one embodiment, the ceramic insertion core of the APC end face selected to the reflectivity of OTDR detection lights can for less than etc.
In -60dB, for example, the ceramic insertion core of APC end face of the reflectivity between -60dB to -65dB can be selected to form the inhibition light
Reflection unit.In practical application, the ceramic insertion core of APC end face can be larger than -60dB to OTDR detection light reflectivities, such as
The reflectivity of the ceramic insertion core for the APC end face that can be selected may be -59dB, in practical application, those skilled in the art can root
The ceramic insertion core of the APC end face is selected according to actual conditions, as long as the effect for reducing open-circuit reflection can be played.
In one embodiment, the device of the inhibition light reflection further includes：Closure protection is carried out to the ceramic insertion core of APC end face
Protection sleeve pipe 104, and carry out closure protection using protection sleeve pipe, prevent the impurity such as dust from entering and APC spherical surface ceramics is caused to insert
Core pollutes or damage, and can play fixed function.
In one embodiment, the device of the inhibition light reflection by the basis of SC mechanical connectors simple modifications increase
The ceramic insertion core on the inclined-planes APC forms, after the ceramic insertion core on dismounting APC inclined-planes and built-in optical fiber, the device of the inhibition light reflection
Rapid mechanical connector can be used as to carry out branch optical fiber to use at end connection.
Specifically, there are two ports for the device, and one of port is the SC connector connector of UPC spherical surfaces, for connecting
Connect the output port of optical branching device open circuit.Existing optical branching device output port is similarly the SC connector connector of UPC spherical surfaces, i.e.,
SC/UPC connectors.APC spherical surface ceramic insertion cores are detachable.When being closed termination for optical branching device open circuit output port, then retain
APC spherical surface ceramic insertion cores reduce OTDR check frequencies for absorbing strong reflection signal.When the road port needs to connect branch
When optical fiber, APC spherical surface ceramic insertion cores can be disassembled together with built-in fiber, remainder can be used as Quick mechanical
Connector is terminated for branch optical fiber, and continues to connect with optical branching device.Another port of the device can be then using APC
The ceramic insertion core of spherical surface can not have to be encapsulated as SC connector, and carry out closure protection using protection sleeve pipe, prevent dust etc.
Impurity, which enters, causes APC spherical surface ceramic insertion cores to pollute or damage.
Fig. 2 is the structural schematic diagram that the optical branching device output port of one embodiment of the invention is opened a way.N optical branching devices 200 from
Input port 201 receives incident light, is divided into each branch's light paths of n, such as output port 202, output port 203, output port 204,
Output port 204 is connected with receiving terminal 205, and output port 202 and receiving terminal 203 are respectively the end faces UPC.Output port 204 connects
After being connected to branch optical fiber receiving terminal 205, the connection of the end faces UPC generates -40 reflection losses for arriving -50dB when OTDR is detected.
Under normal circumstances, the output port such as 202,203 of each open circuit is closed (not shown) only with dust cap,
When OTDR is detected, the end faces the UPC output port that OTDR detection optical signals encounter the open circuit will produce the strong reflection of -14dB.If defeated
Exit port 202 and 203 only will produce the anti-of -40~-50dB or so after using branch optical fiber termination when being detected using OTDR
It penetrates.
Fig. 3 shows that the output port connection of the optical branching device open circuit of one embodiment of the invention inhibits the structure of light reflecting device
Schematic diagram.The inhibition light reflecting device 305 is for eliminating OTDR test light splitter output mouths open circuit blind area.
It specifically includes：It is mounted on the output port of each optical branching device open circuit using the device 305 of inhibition light reflection,
Such as output port 302.As shown in output port 302 in Fig. 3, protected always if optical branching device port need not connect branch optical fiber
The device for staying the inhibition to reflect.In this way, the ceramic insertion core of APC end face is used to absorb reflected light signal, reflectivity levels are reduced, from
And reduce the blind area of OTDR detections, improve the accuracy of OTDR detections.
With reference to output port 303 in Fig. 3, if once a certain output port of optical branching device needs to connect branch optical fiber progress
When ODN is built, is opened inhibiting the unit protection of reflection to cover, the ceramic insertion core of APC spherical surfaces is dismantled together with built-in fiber
Get off, remainder 306 is a Rapid mechanical connector, and completion termination process can be connect with branch optical fiber.
In one embodiment, with reference to the output port n of output port 304 in Fig. 3, the device for inhibiting reflection can be removed,
Branch optical fiber, which is connect, using other Rapid mechanical connector ends 307 and is connect with the optical branching device output port completes branch optical fiber
Terminate process.
In one embodiment, a kind of optical link detection method is provided, including：It is defeated by opening a way mounted on optical branching device
The device of inhibition light reflection in exit port inhibits the reflection of OTDR detection signals when carrying out OTDR detections.In this way, can subtract
The check frequency of small OTDR, reduces the strong reflection that port open generates, and OTDR detections are more acurrate.
In OTDR detections, the detection of reflection event return loss value is carried out using OTDR and is analyzed, PON ODN are can be used for
Network optical fiber link fault measuring and diagnosis.Fig. 4,5 are the PON ODN networks for being directed to a kind of secondary light-splitting, are carried out using OTDR
The OTDR curves that PONODN network optical link fault measurings are generated with diagnosis.
Fig. 4 shows the optical branching device output port open circuit OTDR experiment curv schematic diagrames of one embodiment of the invention, such as Fig. 4 institutes
Show, when OTDR carries out PON ODN network optical link fault detects, once optical branching device output port is opened a way, can cause very strong
Reflection, cause generate formed OTDR check frequencies.Fig. 4 shows that first reflection event is optical branching in OTDR test curves
The reflection event that device is formed opens a way since the optical branching device output port exists, causes to show optical branching device from OTDR curves
There are one the hangovers of radian for a distance inner fiber afterwards.The region is precisely due to the OTDR check frequencies that strong reflection generates.At this
OTDR can not detect any event of failure again in region.For example, 1:In 4 optical branching devices, if there is output port open circuit all the way,
OTDR check frequencies can exceed that 90m.
It is bent that Fig. 5 shows that the optical branching device output port connection of one embodiment of the invention inhibits the OTDR of light reflecting device to measure
Line schematic diagram, as shown in figure 5, when OTDR carries out PONODN network optical link fault detects, the connection of optical branching device output port
The device for inhibiting light reflection, the case where open circuit without output port.Optical fiber is almost vertical after OTDR curves show optical branching device
Decline, does not form the hangover of a radian.Therefore it can be detected if there is event of failure OTDR in the region.This
Sample can reduce output port and open by installing the device of an inhibition light reflection in the optical branching device in optical communication link
The strong reflection that road generates, OTDR check frequencies caused by eliminating optical branching device output port open circuit, after improving OTDR to splitter
The effect of branch optical fiber fault detect so that OTDR detections are more acurrate.
Description of the invention provides for the sake of example and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
Various embodiments with various modifications of the solution present invention to design suitable for special-purpose.
Claims (8)
1. a kind of device inhibiting light reflection, which is characterized in that including：
The ceramic insertion core of the end faces UPC, the output port for connecting optical branching device open circuit,
The ceramic insertion core of APC end face is removably connect with the ceramic insertion core of the end faces UPC, for absorbing reflected light signal.
2. device according to claim 1, which is characterized in that including：Plug, the output end for connecting optical branching device open circuit
Mouthful.
3. the apparatus of claim 2, which is characterized in that the plug is SC connectors.
4. the apparatus according to claim 1, which is characterized in that further include pre-buried optical fiber, run through the ceramics of the end faces UPC
Lock pin is simultaneously inserted into the ceramic insertion core of the APC end face.
5. device according to claim 4, which is characterized in that
The pre-buried optical fiber is connected with the output optical fibre in the output port of the open circuit of the optical branching device.
6. according to any device in claim 1 to 5, which is characterized in that further include for the pottery to the APC end face
Porcelain lock pin carries out the protection sleeve pipe for being closed protection.
7. device according to claim 4 or 5, which is characterized in that including：
After ceramic insertion core and the built-in pre-buried optical fiber of dismantling the APC end face, the device conduct for inhibiting light reflection
Rapid mechanical connector is used for optical fiber Cheng Duan.
8. a kind of optical link detection method, which is characterized in that including：
Pass through the inhibition light reflection as described in any in claim 1 to 7 on the output port that optical branching device is opened a way
Device inhibit when carrying out OTDR detections OTDR detection signal reflection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410806555.5A CN105790828B (en) | 2014-12-22 | 2014-12-22 | Inhibit the device and optical link detection method of light reflection |
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| CN201410806555.5A CN105790828B (en) | 2014-12-22 | 2014-12-22 | Inhibit the device and optical link detection method of light reflection |
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| CN105790828B true CN105790828B (en) | 2018-07-27 |
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| CN113783606B (en) * | 2019-12-31 | 2023-05-16 | 华为技术有限公司 | Optical distribution device, optical communication detection system and optical communication detection method |
| CN115061249A (en) * | 2022-05-13 | 2022-09-16 | 江苏俊知传感技术有限公司 | 1 divide 4 simple and easy inserted sheet formula optical divider |
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| CA2567233A1 (en) * | 2005-11-08 | 2007-05-08 | Oz Optics Ltd. | Fault detection in optical fibers |
| CN101930103B (en) * | 2010-08-25 | 2013-01-16 | 深圳市特发信息光网科技股份有限公司 | Optical cable branch box |
| US9557488B2 (en) * | 2011-01-11 | 2017-01-31 | Corning Incorporated | Optical connector with lenses having opposing angled planar surfaces |
| CN203616506U (en) * | 2013-11-13 | 2014-05-28 | 中国电子科技集团公司第二十三研究所 | Inclined-plane contact-pin multi-core optical fiber connector |
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