CN107070544A - Optical assembly, detecting devices and decision method using the optical assembly - Google Patents
Optical assembly, detecting devices and decision method using the optical assembly Download PDFInfo
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- CN107070544A CN107070544A CN201710018948.3A CN201710018948A CN107070544A CN 107070544 A CN107070544 A CN 107070544A CN 201710018948 A CN201710018948 A CN 201710018948A CN 107070544 A CN107070544 A CN 107070544A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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 application provides a kind of optical assembly, detecting devices and decision method using the optical assembly, to solve in the prior art can not be the problem of remotely detecting to the malfunctions of PON terminals.Specifically, the photodetector detected to the reflection echo of 1490 nano wave length downlink optical signals in PON is added on the basis of existing PON light power meters using the detecting devices of the optical assembly, and provides decision method and device that the optical signal power aggregation of data detected according to upstream ends photodetector, downstream end photodetector and reflection end photodetector determines PON terminal fault states.Application scheme simplifies fault detect flow, realizes quick network failure positioning, improves the intelligent level of fault detect.
Description
Technical field
The application is related to PON technical field, specially a kind of optical assembly, the detecting devices using the optical assembly and sentences
Determine method.
Background technology
Fiber optic communication is the communication mode for transmitting information in optical fiber using light wave, because laser has high direction
The remarkable advantages such as property, high coherence, high monochromaticity, the light wave in fiber optic communication is mainly laser, laser-optical fiber is done so being called
Communication.The principle of fiber optic communication is：First have to the information (such as voice) of transmission to become electric signal in transmitting terminal, be then modulated to
On the laser beam that laser is sent, the intensity of light is set to change with the amplitude (frequency) of electric signal and change, and sent by optical fiber
Go out；In receiving terminal, detector receives and electric signal is converted it into after optical signal, demodulated recovery prime information.Fiber optic communication
Have become the prevailing transmission means of modern communication networks.
In general, communication network includes backbone network and access network two large divisions.(Fiber To The x, optical fiber connects FTTx
Enter) it is intelligent acess network technology of new generation, for connecting telecom operators and terminal user.FTTx network can be active
Fiber optic network (Active Optical Network, AON) or passive optical-fiber network (Passive Optical
Network, PON), because the cost of Active Optical Fiber network is of a relatively high, using seldom actually in access network, so at present
Generally signified FTTx network applications is all passive optical-fiber network.FTTx network structure can be that point-to-point (P2P) also may be used
To be point-to-multipoint (P2MP), P2P cost is higher, is generally only used for VIP user or has the user of specific demand, most
FTTx networks use P2MP structure.
PON technologies are the FTTx (Fiber To The x, intelligent acess) generally acknowledged in the industry at present best solutions,
PON is positioned at " last one kilometer " often said, that is, service provider, telecommunications local side and commercial user or domestic consumer it
Between solution, this technology can make multiple users to share simple optical fibers, so that ODN (Optical
Distribution Network, optical distribution network) in need not use other active devices, that is, do not need light-electricity-light
Conversion, the point-to-multipoint framework of this list greatly reduces network installation, management and maintenance cost.
In PON installation and debugging work, the not only construction of early stage field wiring, installation, or later maintenance, detection are all needed
Detect, analyze and determine the various states of optical terminus, such as the optical modem of user's family whether normal work, whether there is under
Whether row signal, optical modem shut down, optical modem whether abnormal failure, user's family bending loss of optical fiber mistake
Greatly, optical fiber head comes off.At present, confirm that malfunction is required for construction maintenance personnel to enter and investigated in access customer man, it is impossible to
Realize in the long-range detection of (such as in corridor) to user's PON SOT states of termination.
Currently, in the fault detect of PON using it is most popular be PON light power meters, PON light power meters are used to detect
Up 1310 nano wave length optical signal and descending 1490 nano wave length, the intensity of 1550 nano wave length optical signals, its main application
Be detection PON, system, communication whether normal work.
Fig. 1 shows the core optical assembly of the PON light power meters of prior art, the PON light power meter core optical assembly bags
Upstream ends optical fiber interface 1, broadband optical splitter 2, downstream end optical fiber interface 3, upstream ends photodetector 4 and downstream end photoelectricity is included to visit
Survey device 5.
Upstream ends optical fiber interface 1 is the SC/PC fibre-optical splices of user's optical fiber, for concatenating ONT Optical Network Terminal (i.e. ONT)
Or the input of optical network unit (i.e. ONU), user's optical signals enter PON light power meters by upstream ends optical fiber interface 1；
Downstream end optical fiber interface 3 is the SC/PC fibre-optical splices of network side optical, the output end for concatenating optical line terminal (i.e. OLT),
Network optical signals enter PON light power meters by downstream end optical fiber interface 3.
Broadband optical splitter 2 includes 2 uplink optical fibers interfaces and 2 downlink optical fiber interfaces, is connect respectively with upstream ends optical fiber
Mouthful 1, downstream end optical fiber interface 3, upstream ends photodetector 4 and downstream end photodetector 5 are attached, for realize by
Row/downlink optical signal is divided into two-way, respectively enters network side/user's optical fiber and upstream ends/downstream end photodetector.
The power that upstream ends photodetector 4 is used to detect the 1310 nano wave length optical signals transmitted from upstream ends is strong
Degree, downstream end photodetector 5 is used to detect 1490 nano wave lengths transmitted from downstream end and 1550 nano wave length light letter
Number power level.
Fig. 2 shows the PON light power meters of prior art, and liquid crystal display is added outside above-mentioned core optical assembly
(i.e. LCD) is used for the power data for showing the uplink and downlink optical signal that PON is detected.
But PON light power meters do not possess the ability judged PON terminal unit status, such as the following two kinds
Scene：Optical fiber is not attached to optical terminus and optical terminus shutdown, and the testing result of PON light power meters is all to be not detected by 1310 nanometers
Wavelength uplink optical signal, it is clear that the state of both optical terminus cannot be distinguished by for PON light power meters.
Apply for content
The purpose of the application is to provide a kind of optical assembly, detecting devices and decision method using the optical assembly, uses
To solve remotely judge the problem of which kind of network failure state is PON terminals be in the prior art.
To achieve the above object, this application provides a kind of optical assembly, described optical assembly, including broadband optical splitter, on
Row end photodetector, downstream end photodetector, upstream ends optical fiber interface and downstream end optical fiber interface, the upstream ends optical fiber
Interface is connected with the uplink optical fibers interface of the broadband optical splitter, under the downstream end optical fiber interface and the broadband optical splitter
Row optical fiber interface is connected, and the downstream end photodetector is connected with the downlink optical fiber interface of the broadband optical splitter, the light
Component also includes reflection end photodetector and wavelength division multiplexer, uplink optical fibers interface and the wavelength-division of the broadband optical splitter
The input connection of multiplexer, the output end of the wavelength division multiplexer respectively with the upstream ends photodetector and the reflection
Hold photodetector connection.
Further, the broadband optical splitter includes 2 uplink optical fibers interfaces and 2 downlink optical fiber interfaces.
Further, the splitting ratio of described broadband optical splitter is between 30:70 to 5:Between 95.
Further, the reflection echo loss that described downstream end photodetector is produced to downlink optical signal is more than the 8th
Threshold value.
Present invention also provides a kind of method that the judgement of PON terminal networks state is carried out using described optical assembly, wherein,
This method includes：
Optical fiber is detected using the optical assembly, upstream ends photodetectors, downstream end photodetector and anti-is obtained
Penetrate the detection data of end photodetector；
Judged according to the detection data, determine PON terminal network states.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, and the optical signal that upstream ends photodetector is detected is
Pulsed optical signals and power are more than the 3rd threshold value, then PON terminal networks state is that PON terminal works are normal.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The photodetector detection of row end is less than the 7th threshold value less than optical signal or the optical signal power detected, then PON terminal networks shape
State is network-side communication failure.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, and the light letter that upstream ends photodetector is detected
Number it is pulsed optical signals and power between Second Threshold and the 3rd threshold value, then PON terminal networks state is optical network unit
Damaged on end consumption is excessive.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, the detection of upstream ends photodetector less than optical signal or
The optical signal power detected is less than Second Threshold, and the optical signal power that reflection end photodetector is detected is between the 4th
Between threshold value and the 5th threshold value, then PON terminal networks state is that user's optical fiber is not inserted into optical network unit.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, the detection of upstream ends photodetector less than optical signal or
The optical signal power detected is less than Second Threshold, and the optical signal power that reflection end photodetector is detected is between the 5th
Between threshold value and the 6th threshold value, then PON terminal networks state is that optical terminus fibercuts or optical network unit are not keyed up.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, the detection of upstream ends photodetector less than optical signal or
The optical signal power detected is less than Second Threshold, and the optical signal power that reflection end photodetector is detected is more than the 6th
Threshold value, then PON terminal networks state is that optical terminus optical fiber fractures.
Further, it is described to be judged according to the detection data, PON terminal network states are determined, including：If under
The optical signal power that row end photodetector is detected is more than first threshold, and the optical signal that upstream ends photodetector is detected is
Continuous optical signal, then PON terminal networks state is optical network unit damage.
Further, optical assembly described in described use is detected to optical fiber, obtain upstream ends photodetectors, under
Before the detection data of row end photodetector and reflection end photodetector, in addition to：By the optical fiber of network side and the light group
The downstream end optical fiber interface of part connects and is connected the optical fiber of user side with the upstream ends optical fiber interface of the optical assembly.
Present invention also provides a kind of detecting devices using the optical assembly, the equipment includes：Decision maker and light
Component, the decision maker is used for upstream ends photodetector, downstream end photodetector and reflection according to the optical assembly
The detection data of end photodetector is judged, determines PON terminal network states；The optical assembly, including broadband optical splitter,
Upstream ends photodetector, downstream end photodetector, upstream ends optical fiber interface and downstream end optical fiber interface, the upstream ends light
Fine interface is connected with the uplink optical fibers interface of the broadband optical splitter, the downstream end optical fiber interface and the broadband optical splitter
Downlink optical fiber interface is connected, and the downstream end photodetector is connected with the downlink optical fiber interface of the broadband optical splitter, described
Optical assembly also includes reflection end photodetector and wavelength division multiplexer, uplink optical fibers interface and the ripple of the broadband optical splitter
The input connection of division multiplexer, the output end of the wavelength division multiplexer respectively with the upstream ends photodetector and described anti-
Penetrate end photodetector connection.
Further, the detecting devices also includes display device, for showing the PON terminal networks state.
Compared with prior art, the technical scheme of the application is added to PON nets on the basis of existing PON light power meters
The photodetector that the reflection echo of 1490 nano wave length downlink optical signals is detected in network, and there is provided according to upstream ends light
The optical signal power aggregation of data that electric explorer, downstream end photodetector and reflection end photodetector are detected determines PON
The decision method of terminal fault state.Application scheme, which solves existing PON light power meters, can only detect network system and communication
Whether the deficiency of normal work, simplify fault detect flow, realize the positioning of quick network failure, improve fault detect
Intelligent level.Application scheme creatively solves construction maintenance personnel can not judge PON without registering one's residence and checking
The problem of terminal fault, it is to avoid a variety of losses brought because needs are registered one's residence and checked and engineering extension, in PON development pole
For swift and violent coming years, with great market value.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the structural representation of the PON light power meter core optical assemblies of prior art；
Fig. 2 is the structural representation of the PON light power meters of prior art；
The structural representation for the optical assembly that Fig. 3 provides for the embodiment of the present application；
The structural representation of the detecting devices for the use optical assembly that Fig. 4 is provided for the embodiment of the present application；
Description of reference numerals：1st, upstream ends optical fiber interface, 2, broadband optical splitter, 3, downstream end optical fiber interface, 4, upstream ends
Photodetector, 5, downstream end photodetector, 6, reflection end photodetector, 7, wavelength division multiplexer.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
Fig. 3 shows the optical assembly that the embodiment of the present application is provided, and the optical assembly includes upstream ends optical fiber interface 1, broadband point
Light device 2, downstream end optical fiber interface 3, upstream ends photodetector 4 and downstream end photodetector 5, in addition to reflection end photoelectricity are visited
Device 6 and wavelength division multiplexer 7 are surveyed, the upstream ends optical fiber interface 1 is connected with the uplink optical fibers interface of the broadband optical splitter 2, institute
The downlink optical fiber interface that downstream end optical fiber interface 3 is stated with the broadband optical splitter 2 is connected, the downstream end photodetector 5 with
The downlink optical fiber interface connection of the broadband optical splitter 2, uplink optical fibers interface and the wavelength-division multiplex of the broadband optical splitter 2
The input connection of device 7, the output end of the wavelength division multiplexer 7 respectively with the upstream ends photodetector 4 and the reflection
End photodetector 6 is connected.
The reflection end photodetector 6 is used to detect that 1490 nano wave length downlink optical signals are produced on optical terminal equipment
The power level of echo.The wavelength of optical signal that regulation is used in fiber to the home network only have three kinds, i.e., 1310 nanometer, 1490 nanometers
With 1550 nanometers, wherein 1310 nanometers of wavelength that to be uplink optical signal use, it is impossible to be used in the echo detecting of downlink optical signal,
1490 nanometers and 1550 nanometers are wavelength that downlink optical signal can be used, may be without using 1550 nanometers in actual track
The optical signal of wavelength and cause no reflection echo, and the optical signal of 1490 nano wave lengths is the descending light letter for being bound to use
Number, therefore reflection echo signal is obtained using the detection to 1490 nano wave length downlink optical signals.
The wavelength division multiplexer 7 is used to believe 1310 nano wave length uplink optical signals and the descending echo light of 1490 nano wave lengths
Number separated.
Described upstream ends optical fiber interface 1 and downstream end photodetector 5 all can be to 1490 nano wave length downlink optical signals
Reflection echo is produced, and the 1490 nano wave length echoes that downstream end photodetector 5 is produced are an interference sources, the reflection echo
Can being routed to along 5-broadband of downstream end photodetector optical splitter 2-wavelength division multiplexer, 7-reflection end photodetector 6
Up to reflection end photodetector 6, so as to produce interference to the detection data of reflection end photodetector 6.Therefore, it is anti-in order to reduce
The energy of ripple is emitted back towards, it is necessary to control 1490 nano wave length downlink optical signal reflection echos of the generation of downstream end photodetector 5
Loss is more than 50 decibels, so can guarantee that the 1490 nano wave length reflection echos that reflection end photodetector is detected are derived from
Upstream ends optical fiber interface 1, rather than from downstream end photodetector 5.Therefore, the value of the 8th described threshold value is generally
50dB。
Delustring processing is carried out to described downstream end photodetector 5 can reduce the anti-of the 1490 nano wave length echoes produced
Power is penetrated, can be to plate anti-reflection film and/or in coupling on downstream end photodetector 5 in device coupling process by the way of
Adjustment coupling angle during conjunction.On the detector after plating anti-reflection film, the power of transmission can be increased, reflection power is reduced；Coupling
Adjustment coupling angle, can reduce the reflection of echo during conjunction.
The splitting ratio recommended range of the broadband optical splitter 2 is 30:70 to 5：95 are advisable.Typically, it is contemplated that avoid
The test equipment influence big to the generation of practical communication link, therefore 10:90 can be an optimal selection, because this ratio is taken into account
Less insertion loss (for communication link) and appropriately sized detection power.
The major avenues of approach of optical signal is 3-broadband of downstream end optical fiber interface point in the optical assembly of described PON state
Light 2-upstream ends of device optical fiber interface 1, is the main road part of the broadband optical splitter 2 of big splitting ratio, it is ensured that relatively low insertion is damaged
Consumption, has ensured normal fiber optic communication work.
In the optical assembly of described PON state the downstream end detection path of optical signal be downstream end optical fiber interface 3-
Broadband 2-downstream end of optical splitter photodetector 5, the 90% of 1490 nano wave length downlink optical signals of downstream end pass through upstream ends
Optical network unit, the only 10% defeated detector 5 for having arrived downstream end are output to, the detector is used for the light for detecting descending 1490nm
Power level, the return loss that downstream end photodetector 5 is more than 50dB is designed, and effectively eliminates the detector echo to light net
The influence of network elementary echo.
In the optical assembly of described PON state the upstream ends detection path of optical signal be upstream ends optical fiber interface 1-
Broadband optical splitter 2-wavelength division multiplexer, 7-upstream ends photodetector 4, the path is same to send into 90% uplink optical signal
In communication network, 10% uplink optical signal energy is only taken to be used to detect, because upstream ends optical fiber interface 1 has accessed optical-fiber network list
Member, so when the path of broadband 2-wavelength division multiplexer of optical splitter 7 optical signal in, the up light splitting letter of existing 1310 nano wave length
Number, also there are the descending echo optical signal of 1490 nano wave lengths, broadband optical splitter 2-wavelength division multiplexer, 7-upstream ends photodetection
The path of device 4 takes out the uplink optical signal of 1310 nano wave length therein by wavelength division multiplexer 7, and sends into the spy of upstream ends photoelectricity
Device 4 is surveyed to be detected.
In the optical assembly of described PON state the reflection end detection path of optical signal be upstream ends optical fiber interface 1-
Broadband optical splitter 2-wavelength division multiplexer, 7-reflection end photodetector 6, the path is by 1490 nano wave length downlink optical signals
Echo reflection signal feeding reflection end photodetector 6 is detected.
The method judged using the optical assembly progress PON terminal networks state described in Fig. 3 is including the use of the optical assembly to light
Fibre is detected, and obtains the detection data of upstream ends photodetector, downstream end photodetector and reflection end photodetector,
Judged further according to the detection data, determine PON terminal network states.
Described is judged according to the detection data, is determined the method for PON terminal network states and is included：
If the first, the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetection
The optical signal that device is detected is pulsed optical signals and power is more than the 3rd threshold value, then PON terminal networks state is PON terminal works
Normally.
First threshold is generally -25dBm, and it is 1490 nano wave length downlink optical signals that optical power value, which is more than -25dBm,
Power necessary to proper communication, if the value is less than -25dBm, optical terminal equipment will be unable to parse downlink optical signal, can be substantially improved
The bit error rate and communication failure rate.
3rd threshold value generally be -10dBm, when detect 1310 nano wave length uplink optical signals power be more than -
10dBm and for impulse form optical signal when, upstream ends are normal communication state.
If the 2, the detection of downstream end photodetector is less than the 7th threshold less than optical signal or the optical signal power detected
Value, then PON terminal networks state is network side (i.e. OLT ends) communication failure.
7th threshold value be one be much smaller than first threshold value, for example can be first threshold value 1/10 (-
35dBm), 1/100 (- 45dBm) etc..
The problem of exclusion of network-side communication failure will check optical line terminal (i.e. OLT).
If the 3, the optical signal power that downstream end photodetector is detected is more than first threshold, and upstream ends photoelectricity
The optical signal that detector is detected be pulsed optical signals and power between Second Threshold and the 3rd threshold value, then PON terminal networks
Network state is that optical network unit damaged on end consumption is excessive.
Second Threshold is generally -30dBm.1310 nano wave length uplink optical signal power, which are more than -30dBm explanations, to be had
Uplink optical signal, power illustrates that signal is weaker less than -10dBm, and optical signal is decayed serious during by NE.
Optical network unit damaged on end consumes the problems such as excessive failture evacuation need to check the joints of optical fibre, fibre-optical bending degree.
If the 4, the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetection
Device detection is less than Second Threshold less than optical signal or the optical signal power detected, and reflection end photodetector is detected
Optical signal power is between the 4th threshold value and the 5th threshold value, then PON terminal networks state is that user's optical fiber is not inserted into light net
Network unit.
4th threshold value is generally 13dB, and the 5th threshold value is generally 20dB.Detect less than uplink optical signal,
Reflection end can detect the descending smooth reflected signal of 1490 stronger nano wave lengths, illustrate that downlink optical signal reaches user's optical fiber
And generate reflection in fibre-optical splice.Because for reflection, numerical value is smaller, energy is stronger, and optical fiber head is vacantly in air
In, theoretical reflected value is 14.8dB, and the scope that we take is 13~20dB)；For echo, 20dB is bigger than 50dB
1000 times.
User's optical fiber, which is not inserted into optical network unit failture evacuation, to be needed to check the insert state of optical fiber.
If the 5, the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetection
Device detection is less than Second Threshold less than optical signal or the optical signal power detected, and reflection end photodetector is detected
Optical signal power is between the 5th threshold value and the 6th threshold value, then PON terminal networks state is optical terminus fibercuts or light net
Network unit is not keyed up.
6th threshold value is generally 38dB.It is similar with above-mentioned 4th kind of situation, the simply descending light of 1490 nano wave lengths
Than the 4th kind situation of reflected signal is weak because optical terminus fibercuts or optical network unit be not keyed up it is right under both of these case
The reflex of downlink optical signal is weaker.
If the 6, the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetection
Device detection is less than Second Threshold less than optical signal or the optical signal power detected, and reflection end photodetector is detected
Optical signal power is more than the 6th threshold value, then PON terminal networks state is that optical terminus optical fiber fractures.
In the case that optical terminus optical fiber fractures, the reflex to the descending light of 1490 nano wave lengths is most weak, therefore reflection end
The optical signal power detected is also minimum.
If the 7, the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetection
The optical signal that device is detected is continuous optical signal, then PON terminal networks state is damaged for optical network unit.
Although when the power that upstream ends photodetector detects the up light of 1310 nano wave lengths is more than -10dBm, signal
For continuous optical signal, because normal optical terminus does not allow to send continuous light, illustrate terminal abnormal failure.
The described use optical assembly is detected to optical fiber, obtains upstream ends photodetector, downstream end photodetection
, it is necessary to which the downstream end optical fiber of the optical fiber of network side and the optical assembly is connect before the detection data of device and reflection end photodetector
Mouth connection, in addition it is also necessary to be connected the optical fiber of user side with the upstream ends optical fiber interface of the optical assembly.
Fig. 4 shows the detecting devices of the use of the embodiment of the present application offer optical assembly, and the detecting devices includes：Light group
Part, decision maker and display device.
Described optical assembly is used to detect PON data.
Described decision maker be used for according to the upstream ends photodetector of the optical assembly, downstream end photodetector and
The detection data of reflection end photodetector is judged, determines PON terminal network states, is to the PON terminal networks shape
The one kind for the method that state judges is implemented.
Described display device is used to show the PON terminal networks state, and a kind of feasible display device is liquid crystal
Show device (Liquid Crystal Display, LCD).
The detecting devices of the use optical assembly provided using the embodiment of the present application, can produce PON terminal test
Instrument, as long as the network side optical in optical cable case in corridor to be inserted to the downstream end optical fiber interface of instrument, user's optical fiber is inserted
Enter the upstream ends optical fiber interface of instrument, you can the state to PON terminals optical network unit or ONT Optical Network Terminal is analyzed and sentenced
It is fixed.
Compared with prior art, the technical scheme of the application is added to PON nets on the basis of existing PON light power meters
The photodetector that the reflection echo of 1490 nano wave length downlink optical signals is detected in network, and there is provided according to upstream ends light
The optical signal power aggregation of data that electric explorer, downstream end photodetector and reflection end photodetector are detected determines PON
The decision method of terminal fault state.Application scheme, which solves existing PON light power meters, can only detect network system and communication
Whether the deficiency of normal work, simplify fault detect flow, realize the positioning of quick network failure, improve fault detect
Intelligent level.Application scheme creatively solves construction maintenance personnel can not judge PON without registering one's residence and checking
The problem of terminal fault, it is to avoid a variety of losses brought because needs are registered one's residence and checked and engineering extension, in PON development pole
For swift and violent coming years, with great market value.
Here, it will be appreciated by those skilled in the art that the regular job of the noun of locality is binding operation person and user are practised
Used and Figure of description and set up, their appearance should not influence the protection domain of the application.
The application is described in detail above in association with accompanying drawing embodiment, those skilled in the art can be according to upper
State it is bright the application is made many variations example.Thus, some of embodiment details should not constitute the restriction to the application, this
Protection domain of the scope that application will be defined using appended claims as the application.
Claims (15)
1. a kind of optical assembly, including broadband optical splitter, upstream ends photodetector, downstream end photodetector, upstream ends optical fiber
Interface and downstream end optical fiber interface, the upstream ends optical fiber interface are connected with the uplink optical fibers interface of the broadband optical splitter, institute
The downlink optical fiber interface that downstream end optical fiber interface is stated with the broadband optical splitter is connected, the downstream end photodetector with it is described
The downlink optical fiber interface connection of broadband optical splitter, wherein, the optical assembly also includes reflection end photodetector and wavelength-division multiplex
Device, the uplink optical fibers interface of the broadband optical splitter is connected with the input of the wavelength division multiplexer, the wavelength division multiplexer
Output end is connected with the upstream ends photodetector and the reflection end photodetector respectively.
2. optical assembly according to claim 1, wherein, described broadband optical splitter includes 2 uplink optical fibers interfaces and 2
Downlink optical fiber interface.
3. optical assembly according to claim 1 or 2, wherein, the splitting ratio of described broadband optical splitter is between 30:70 to 5:
Between 95.
4. optical assembly according to claim 1 or 2, wherein, described downstream end photodetector is produced to downlink optical signal
Raw reflection echo loss is more than the 8th threshold value.
5. a kind of optical assembly using described in claim 1 carries out the method that PON terminal networks state judges, wherein, this method
Including:
Optical fiber is detected using the optical assembly, upstream ends photodetector, downstream end photodetector and reflection end is obtained
The detection data of photodetector；
Judged according to the detection data, determine PON terminal network states.
6. method according to claim 5, wherein, judged according to the detection data, determine PON terminal network shapes
State, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetector is detected
Optical signal be more than the 3rd threshold value for pulsed optical signals and power, then PON terminal networks state is that PON terminal works are normal.
7. method according to claim 5, wherein, judged according to the detection data, determine PON terminal network shapes
State, including：
If the detection of downstream end photodetector is less than the 7th threshold value, PON less than optical signal or the optical signal power detected
Terminal network state is network-side communication failure.
8. method according to claim 5, wherein, judged according to the detection data, determine PON terminal network shapes
State, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, and upstream ends photodetector is visited
The optical signal measured be pulsed optical signals and power between Second Threshold and the 3rd threshold value, then PON terminal networks state is
Optical network unit damaged on end consumption is excessive.
9. method according to claim 5, wherein, judged according to the detection data, determine PON terminal network shapes
State, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetector is detected not
It is less than Second Threshold, and the optical signal work(that reflection end photodetector is detected to optical signal or the optical signal power detected
Rate is between the 4th threshold value and the 5th threshold value, then PON terminal networks state is that user's optical fiber is not inserted into optical network unit.
10. method according to claim 5, wherein, judged according to the detection data, determine PON terminal networks
State, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetector is detected not
It is less than Second Threshold, and the optical signal work(that reflection end photodetector is detected to optical signal or the optical signal power detected
Rate between the 5th threshold value and the 6th threshold value, then PON terminal networks state be optical terminus fibercuts or optical network unit not
Start.
11. method according to claim 5, wherein, described PON terminal network state decision rules, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetector is detected not
It is less than Second Threshold, and the optical signal work(that reflection end photodetector is detected to optical signal or the optical signal power detected
Rate is more than the 6th threshold value, then PON terminal networks state is that optical terminus optical fiber fractures.
12. method according to claim 5, wherein, judged according to the detection data, determine PON terminal networks
State, including：
If the optical signal power that downstream end photodetector is detected is more than first threshold, upstream ends photodetector is detected
Optical signal be continuous optical signal, then PON terminal networks state be optical network unit damage.
13. the method according to any one of claim 5 to 12, wherein, optical fiber is detected using the optical assembly,
Before the detection data for obtaining upstream ends photodetector, downstream end photodetector and reflection end photodetector, in addition to：
The optical fiber of network side is connected with the downstream end optical fiber interface of the optical assembly；
The optical fiber of user side is connected with the upstream ends optical fiber interface of the optical assembly.
14. a kind of detecting devices using the optical assembly, wherein, the detecting devices includes：
Optical assembly any one of Claims 1-4；
Decision maker, for the upstream ends photodetector according to the optical assembly, downstream end photodetector and reflection end light
The detection data of electric explorer is judged, determines PON terminal network states.
15. detecting devices according to claim 14, wherein, the detecting devices also includes：
Display device, for showing the PON terminal networks state.
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