CN101296039B - Optical fiber link monitoring system and method for passive optical fiber network - Google Patents
Optical fiber link monitoring system and method for passive optical fiber network Download PDFInfo
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- CN101296039B CN101296039B CN200710100954XA CN200710100954A CN101296039B CN 101296039 B CN101296039 B CN 101296039B CN 200710100954X A CN200710100954X A CN 200710100954XA CN 200710100954 A CN200710100954 A CN 200710100954A CN 101296039 B CN101296039 B CN 101296039B
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Abstract
The invention provides an optical fiber link monitoring system of a passive optical fiber network, which comprises a main control monitoring device connected with an OLT end of optical fiber link terminal equipment and a plurality of response devices connected with an ONU end of an optical fiber network unit. The main control monitoring device applies time division multiplexing technique to order the response devices to send response optical signals in sequence and judge the link status by measuring the power of the response optical signals. The invention also provides a method for monitoring the optical fiber link of the passive optical fiber network. The system and method of the invention can supplement the shortages such as an optical time domain reflect meter in the prior art, monitor and record the quality of optical fiber transmission so as to replace the deteriorated optical fiber in time, and judge the broken-down line section in time and shorten the overhaul time when a sudden break of optical fiber cable happens.
Description
Technical field
The present invention relates to a kind of passive fiber network (Passive Optical Network, PON) monitoring technology, particularly about on passive fiber network, utilizing timesharing multichannel (TimeDivision Multiplexing, TDM) technology makes each optical network unit (Optical NetworkUnit ONU) responds method with monitoring optical fiber link quality in regular turn.
Background technology
Because characteristics such as capacity are big, reliability is high, transmission range is long, optical fiber becomes the backbone in the telecommunication link gradually.By optical fiber data directly being sent to the service of client, will be the main flow that following wideband link is used, and for example, optical fiber is to commuting case (Fiber To The Cabinet; FTTCab), Fiber To The Curb (Fiber To The Curb, FTTC), Fiber-To-The-Building (Fiber ToThe Building, FTTB) and fiber-to-the-home (Fiber To The Home, FTTH), above-mentioned service can be referred to as FTTx.Passive fiber network (Passive Optical Network, PON) based on passive optical fiber framework, a kind of chained technology that has competitive advantage.Fig. 1 shows the system architecture schematic diagram of a traditional passive fiber network 100, optical line terminal equipment 110 (Optical Line Terminator wherein, OLT) externally be connected to the optical fiber link trunk, by the light signal that passes under the optical line terminal equipment, by optical fiber via passive device optical splitter device (Splitter, SP) 120, light signal is broadcast to each terminal use along separate routes, that is optical network unit (OpticalNetwork Unit, ONU) 131-134.The signal that optical network unit 131-134 uploads then sends optical line terminal equipment 110 to after 120 couplings of optical splitter device.
Along with the fiber optic network application popularizationization, the fault judgement of optical fiber link is ever more important also.With reference to Fig. 2, it shows the broken string situation schematic diagram of fiber optic network 100.Suppose the optical fiber link broken string of optical splitter device 120 to 134 of optical network units, after the maintenance personal obtains customer response, can't judge at once this fault be optical line terminal device 110 to optical splitter device 120 intermittent line, or optical splitter device 120 is to optical network unit 134 intermittent line.In addition, be erected at outer Connectorized fiber optic cabling and also may be subjected to the external force effect and cause the transmission quality deterioration, push accidentally during as engineering construction, collide, or or even be subjected to gravity effect and bending etc.This deterioration process is slow, often be difficult for discovering at once, but accumulation will cause user's inconvenience after forming fault state, influence goodwill.These event of failures can use traditionally such as optical time domain reflectometer (opticaltime-domain reflectometry; OTDR) optical link fault point checkout gear is done the location of fault point.Optical time domain reflectometer is by different time points, with respect to the test optical fiber signal reflect naturally and time luminous power and the comparison of the original fiber quality track of precedence record, and failure judgement point or break point whereabouts.Yet the optical time domain reflectometer and the effective state of interpretation tree-shaped passive fiber network as depicted in figs. 1 and 2 are because of it is difficult to distinguish the fault that betides tree network framework end.
Based on the shortcoming of above conventional art, it is necessary to propose a kind of optical fiber link monitoring method and system, with the deficiencies in the prior art such as light filling time-domain reflectors.In monitoring record Optical Fiber Transmission quality at ordinary times, so that in time change the Connectorized fiber optic cabling of own deterioration, when meeting the Connectorized fiber optic cabling broken string of burst, failure judgement line segment immediately again, shortening repair time.
Summary of the invention
One of the present invention purpose is to propose a kind of optical fiber link monitoring method of passive fiber network, can judge optical fiber link broken string position immediately, shortens maintenance time.
Another object of the present invention is to propose a kind of optical fiber link monitoring method of passive fiber network,, change the Connectorized fiber optic cabling of deterioration early with detecting record optical fiber link quality.
Another purpose of the present invention is to propose a kind of device of realizing the optical fiber link monitoring method of above-mentioned passive fiber network.
According to above-mentioned purpose, the present invention proposes a kind of optical fiber link monitoring system, it comprises a master control monitoring device and a plurality of responding device, master control monitoring device is wherein broadcasted a specific instruction to above-mentioned a plurality of responding devices, one of to require in a plurality of responding devices the specific response device to continue a specific response light signal of passback one first special time length, and the situation that the master control monitoring device receives according to the specific response light signal, whether judgement is connected to one of specific response device particular fiber link normal.
The present invention also proposes a kind of optical fiber link monitoring method, and it comprises following steps: broadcast a specific instruction to a plurality of responding devices from a master control monitoring device and continue a specific response light signal of passback one first special time length one of to require in a plurality of responding devices the specific response device; Return the specific response light signal to the master control monitoring device from the specific response device; And, judge whether the particular fiber link that is connected to the specific response device is normal according to the situation that the specific response light signal receives.
Beneficial effect of the present invention shows as: can the light filling time-domain reflector etc. the deficiencies in the prior art.And can monitor record Optical Fiber Transmission quality, and so that in time change the Connectorized fiber optic cabling of deterioration, when meeting the Connectorized fiber optic cabling broken string of burst, failure judgement line segment immediately again, shortening repair time.
Description of drawings
Fig. 1 shows the system architecture schematic diagram of traditional passive fiber network.
The schematic diagram of Fig. 2 passive fiber network broken string situation.
Fig. 3 is according to the passive fiber network system architecture schematic diagram of one embodiment of the invention.
Fig. 4 shows the functional block diagram according to the master control monitoring device of one embodiment of the invention.
Fig. 5 shows the functional block diagram according to the responding device of one embodiment of the invention.
Fig. 6 shows the flow chart according to the optical fiber link monitoring method of one embodiment of the invention.
The optical fiber network system broken string situation schematic diagram of Fig. 7 illustration Fig. 3.
Symbol description among the figure
100 traditional passive fiber networks
110 optical line terminal equipment
120 optical splitter devices
The 131-134 optical network unit
310 optical line terminal equipment
320 optical splitter devices
330.1-330.4 optical network unit
350.1-350.4 responding device
360 main optical fiber links
The 361-364 optical fiber link
340 master control monitoring devices
The 340a CPU
340b 850nm LASER Light Source
340c optical wavelength coupler
340d 780nm luminous power detecting unit
350 responding devices
The 350a CPU
350b 780nm LASER Light Source
350c optical wavelength coupler
350d 850nm luminous power detecting unit
The step of 601-607 optical fiber link monitoring method
Embodiment
Being described in detail as follows of some embodiments of the invention, however except this was described in detail, the present invention can also be widely implements at other embodiment.That is scope of the present invention is not subjected to the restriction of the embodiment that proposed, and should be as the criterion with the claim that the present invention proposes.
Moreover for clearer description being provided and being more readily understood the present invention, each is not partly drawn according to its relative size in the icon, and some size is compared with other scale dependent and exaggerated; Incoherent details is not partly drawn fully yet, succinct in the hope of icon.
Fig. 3 shows the configuration diagram of the optical fiber network system with optical fiber link monitoring function 300 of one embodiment of the invention, and it comprises optical line terminal equipment 310, master control monitoring device 340, optical splitter device 320, responding device 350.1-350.4 (following or be referred to as responding device 350) and optical network unit 330.1-330.4.With the traditional fiber network system 100 of Fig. 1 more as can be known, master control monitoring device 340 wherein and responding device 350 the present invention are new to add in order to carry out the main device of monitoring function.Optical line terminal equipment 310 is connected to master control monitoring device 340, and master control monitoring device 340 is connected to optical splitter device 320 via main optical fiber link 360.Optical splitter device 320 is connected to responding device 350.1-350.4 by optical fiber link 361-364 respectively.Responding device 350.1-350.4 is connected to each optical network unit 330.1-330.4 respectively.
In the present embodiment, master control monitoring device 340 with the timesharing multichannel (Time DivisionMultiplexing, TDM) the technologies broadcast wavelength is 850nm (narometer; How the time that light signal rice) sends light signal one length-specific of response to order each responding device to continue, for example 2 seconds.Optical splitter device 320 is transferred to each responding device 350.1-350.4 respectively with the light signal of this broadcasting.Be noted that only for giving an example, this broadcasting light signal does not limit specific wavelength to 850nm, its wavelength that only must avoid existing Communication ray signal use gets final product.It is also non-in order to limit, as long as the time of this length-specific is enough to measure response light power to continue luminous 2 seconds.Responding device 350.1-350.4 is after receiving luminous order, and the light signal of passback wavelength 780nm is to master control monitoring device 340.Also only for giving an example, it only must avoid existing transport communication wavelength and get final product this passback wavelength.Luminous power can be analyzed and note down to master control monitoring device 340 after receiving the light signal of passback, judge according to this whether the optical fiber link 330.1-330.4 that is connected to responding device 350.1-350.4 is normal.For example, do not receive the light signal of passback, optical signal power low excessively (less than a particular threshold) or too high (greater than another particular threshold) of passback, can judge that then the optical fiber link 330.1-330.4 that is connected to responding device 350.1-350.4 may take place unusually.In addition, based on the situation of all passback light signals, can the comprehensive analysis location of fault whether be positioned at the main optical fiber link 360 of 320 of master control monitoring device 340 and optical splitter devices.
Fig. 4 shows the functional block diagram according to the master control monitoring device 340 of one embodiment of the invention, and it comprises optical wavelength coupler 340c, luminous power detecting unit 340d, CPU 340a and LASER Light Source 340b.Optical wavelength coupler 340c is connected to outside optical line terminal equipment 310 (not being shown among the figure) and main optical fiber link 360 (not being shown among the figure).Optical wavelength coupler 340c also is connected to LASER Light Source 340b and luminous power detecting unit 340d.LASER Light Source 340b and luminous power detecting unit 340d all are connected to CPU 340a.
It is that the light signal of 850nm carries a specific instruction to order a specific response device (for example, responding device 350.1) response one light signal that CPU 340a requires LASER Light Source 340b to transmit a wavelength.The light signal of this 850nm is outwards broadcasted with the optical fiber link that is connected via optical wavelength coupler 340c.When receiving the light signal of the 780nm wavelength that returns from this specific response device, be sent to luminous power detecting unit 340d via optical wavelength coupler 340c.CPU 340a analyzes according to aforesaid method the result that luminous power detecting unit 340d measures.If the result is normal, then CPU 340a will start the test program of next responding device; If results abnormity, then CPU 340a judges that this unusual condition is broken string, line degradation or other situation, and starts relevant alarm or handling procedure.This CPU can comprise memory storage, to write down measuring light power result always, and can be for judging circuit quality deterioration situation.
Fig. 5 shows the functional block diagram according to the responding device 350 of one embodiment of the invention, and it comprises optical wavelength coupler 350c, luminous power detecting unit 350d, CPU 350a and LASER Light Source 350b.Optical wavelength coupler 350c is connected to outside optical network unit (not being shown among the figure) and optical fiber link (not being shown among the figure).Optical wavelength coupler 350c also is connected to LASER Light Source 350b and luminous power detecting unit 350d.LASER Light Source 350b and luminous power detecting unit 350d all are connected to CPU 350a.Be sent to luminous power from the 850nm wavelength light signal of master control monitoring device via optical wavelength coupler 350c and detect 350d, and parse wherein specific instruction by CPU 350a.CPU 350a is if find this responding device of target 700 of this specific instruction, and then requiring LASER Light Source 350b to continue to send a wavelength is the 780nm light signal, via optical wavelength coupler 350c and optical fiber link passback.
Fig. 6 shows that it comprises step 601 to step 607 according to the flow chart of the optical fiber link monitoring method of one embodiment of the invention.In step 601, the master control monitoring device of optical line terminal equipment end is broadcast to a specific instruction responding device of each optical network unit end.Be that the light signal of 850nm carries this specific instruction with a wavelength in this embodiment, and order a specific response device to respond a light signal to continue 2 seconds.In step 602, all responding devices all receive this specific instruction.In the step 603, the specific response device of appointment in the above-mentioned specific instruction is according to requiring the light signal passback with wavelength 780nm to continue for 2 seconds.In step 604, the master control monitoring device is in the light signal of this time inner analysis from the passback of this specific response device, as the scope of the power that has that it's too late of signal etc.In step 605, system will judge that further optical fiber link has or not deterioration or broken string situation at analysis result, if the light signal of check passback is all normal, then system starts the detection process of next responding device with direct execution in step 607.But if unusual condition occurs, be lower than below the specified standard value, represent link to have degradation as the luminous power numerical value that receives; Or not having the light input fully, the broken string situation that then expressed possibility breaks down; These unusual conditions will make the alarming mechanism of system start-up step 606, and this mechanism can be sent the alarm signal of video signal or message form by a man-machine interface, have unusual condition to take place to remind the manager.Simultaneity factor is execution in step 607 also, starts the detection process of next responding device, and the light signal by the passback of follow-up responding device is to judge the fiber position of fault.
The optical fiber network system 300 broken string situation schematic diagrames of Fig. 7 illustration Fig. 3, label 361-364 represents optical splitter device 320 respectively to the optical fiber link between the responding device 350.1-350.4, and the broken string situation betides the optical fiber link 364 between optical splitter device 320 and the responding device 350.4.According to method of the present invention, master control monitoring device 340 is when carrying out the detection process of responding device 350.1,350.2,350.3, all can receive light signal smoothly from 350.1,350.2 and 350.3 passbacks, expression optical line terminal equipment 310 is to 320 of optical splitter devices, and optical splitter device 320 is normal to 350.1,350.2 and 350.3 circuits of responding device.Master control monitoring device 340 situation that when carrying out the detection process of responding device 350.4, notes abnormalities, expression optical line terminal equipment 310 to 320 of optical splitter devices or optical splitter device 320 to line fault between the responding device 350.4; But can judge that optical line terminal equipment 310 to 320 section circuits of optical splitter device are normal condition by 350.1,350.2 and 350.3 detection process, so the broken string situation should betide optical splitter device 320 between the responding device 350.4.The maintenance of showing up rapidly of the relevant equipment of maintenance personal's portability is saved time.
Above-mentioned light signal such as the specific wavelength of 850nm and 780nm and its special time length that continues all for convenience of description for example, the technology personage in this area all can reach function of the present invention and characteristic when understanding many other alternative numerical value.The only possible reality of each embodiment is made example, and many variations or modification all can be reached under the principle that does not break away from this announcement.These variations or revise all should be considered as within this announcement category and to be protected by appended claim.
Claims (10)
1. optical fiber link monitoring system, it comprises a master control monitoring device and a plurality of responding device, wherein this master control monitoring device is broadcasted a specific instruction to these a plurality of responding devices, one of to require in these a plurality of responding devices the specific response device to continue a specific response light signal of passback one first special time length, and the situation that this master control monitoring device receives according to this specific response light signal, whether judgement is connected to one of this specific response device particular fiber link normal, and wherein the situation of this specific response light signal reception has one of following situation person, and this master control monitoring device judges that this particular fiber link is in abnormal state of affairs:
(1) this master control monitoring device does not receive this specific response light signal in one second special time length;
(2) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is lower than one first threshold value; Or
(3) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is higher than one second threshold value.
2. optical fiber link monitoring system as claimed in claim 1, wherein this master control monitoring device is connected to an optical line terminal equipment OLT, and relaying is for the following biography of this optical line terminal equipment with upload the communication light signal, this specific response device is connected to an optical network unit ONU, and relaying is for the following biography of this optical network unit with upload the communication light signal, and this specific instruction is broadcast to this a plurality of responding devices in the mode of timesharing multichannel.
3. optical fiber link monitoring system as claimed in claim 2, wherein this master control monitoring device comprises:
One first LASER Light Source is to send the light signal that carries this specific instruction;
One first luminous power detecting unit is to detect this specific response light signal; And
One first optical wavelength coupling element, with coupling carry the following biography communication light signal of the light signal of this specific instruction and this optical line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal.
4. optical fiber link monitoring system as claimed in claim 3, wherein this specific response device comprises:
One second LASER Light Source is to send this specific response light signal;
One second luminous power detecting unit carries the light signal of this specific instruction with detecting; And
One second optical wavelength coupling element, with coupling carry the following biography communication light signal of the light signal of this specific instruction and this optical line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal.
5. optical fiber network system with optical fiber link monitoring function, it comprises:
One optical line terminal equipment OLT passes the communication light signal in order to send down;
A plurality of optical network unit ONU upload the communication light signal in order to send;
One master control monitoring device is connected to this optical line terminal equipment; And
A plurality of responding devices, these a plurality of responding devices are connected to this a plurality of optical network units respectively;
Wherein this master control monitoring device is broadcasted a specific instruction to this a plurality of responding devices and is continued to return a specific response light signal of one first special time length one of to require in these a plurality of responding devices the specific response device, and the situation that this master control monitoring device receives according to this specific response light signal, whether judgement is connected to one of this specific response device particular fiber link normal, and wherein the situation of this specific response light signal reception has one of following situation person, and this master control monitoring device judges that this particular fiber link is in abnormal state of affairs:
(1) this master control monitoring device does not receive this specific response light signal in one second special time length;
(2) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is lower than one first threshold value; Or
(3) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is higher than one second threshold value.
6. the optical fiber network system with optical fiber link monitoring function as claimed in claim 5, wherein this master control monitoring device relaying is for the following biography communication light signal of this optical line terminal equipment, this specific response device relaying is uploaded the communication light signal for this optical network unit, and this specific instruction is broadcast to this a plurality of responding devices in the mode of timesharing multichannel.
7. the optical fiber network system with optical fiber link monitoring function as claimed in claim 6, wherein this master control monitoring device comprises:
One first LASER Light Source is to send the light signal that carries this specific instruction;
One first luminous power detecting unit is to detect this specific response light signal; And
One first optical wavelength coupling element carries light signal and this light of this specific instruction with coupling
The following biography communication light signal of fine line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal;
And wherein this specific response device comprises:
One second LASER Light Source is to send this specific response light signal;
One second luminous power detecting unit carries the light signal of this specific instruction with detecting; And
One second optical wavelength coupling element, with coupling carry the following biography communication light signal of the light signal of this specific instruction and this optical line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal.
8. optical fiber link monitoring method, it comprises following steps:
Broadcast a specific instruction to a plurality of responding devices from a master control monitoring device and continue a specific response light signal of passback one first special time length one of to require in these a plurality of responding devices the specific response device;
Return this specific response light signal to this master control monitoring device from this specific response device; And
According to the situation that this specific response light signal receives, whether judgement is connected to one of this specific response device particular fiber link normal;
Wherein the situation of this specific response light signal reception has one of following situation person, and this master control monitoring device judges that this particular fiber link is in abnormal state of affairs:
(1) this master control monitoring device does not receive this specific response light signal in one second special time length;
(2) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is lower than one first threshold value; Or
(3) this master control monitoring device luminous power of receiving this specific response light signal in this second special time length is higher than one second threshold value.
9. optical fiber link monitoring method as claimed in claim 8, wherein this master control monitoring device is connected to an optical line terminal equipment OLT, and relaying is for the following biography of this optical line terminal equipment with upload the communication light signal, this specific response device is connected to an optical network unit ONU, and relaying is for the following biography of this optical network unit with upload the communication light signal, and this specific instruction is broadcast to this a plurality of responding devices in the mode of timesharing multichannel.
10. optical fiber link monitoring method as claimed in claim 9, wherein this master control monitoring device comprises:
One first LASER Light Source is to send the light signal that carries this specific instruction;
One first luminous power detecting unit is to detect this specific response light signal; And
One first optical wavelength coupling element, with coupling carry the following biography communication light signal of the light signal of this specific instruction and this optical line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal;
And wherein this specific response device comprises:
One second LASER Light Source is to send this specific response light signal;
One second luminous power detecting unit carries the light signal of this specific instruction with detecting; And
One second optical wavelength coupling element, with coupling carry the following biography communication light signal of the light signal of this specific instruction and this optical line terminal equipment and be coupled this specific response light signal and this optical network unit upload the communication light signal.
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| CN200710100954XA CN101296039B (en) | 2007-04-28 | 2007-04-28 | Optical fiber link monitoring system and method for passive optical fiber network |
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| CN200710100954XA CN101296039B (en) | 2007-04-28 | 2007-04-28 | Optical fiber link monitoring system and method for passive optical fiber network |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101814950B (en) * | 2009-02-23 | 2013-04-10 | 高通创锐讯通讯科技(上海)有限公司 | Generation mechanism for receiving optical power measurement indication signal and error protection method |
| CN101789824A (en) * | 2009-12-30 | 2010-07-28 | 中兴通讯股份有限公司 | Online optical network unit (ONU) optical power acquisition device and method |
| WO2011124169A2 (en) * | 2011-05-11 | 2011-10-13 | 华为技术有限公司 | Method, apparatus and system for detecting type of network equipment |
| JP5564027B2 (en) * | 2011-11-04 | 2014-07-30 | アンリツ株式会社 | Light measuring device |
| CN102386973A (en) * | 2011-11-10 | 2012-03-21 | 浙江工业大学 | Out-of-band signaling-based failure detection and positioning method for light-trail network |
| CN102386974B (en) * | 2011-12-13 | 2014-10-22 | 中国电信股份有限公司 | PON (passive optical network) network fault detection method and device |
| CN107294599A (en) * | 2016-04-12 | 2017-10-24 | 中兴通讯股份有限公司 | A kind of light path diagnostic method and device |
| CN109004974A (en) * | 2018-08-22 | 2018-12-14 | 惠安科培工业设计有限公司 | Fiber optic network fault detection means |
| CN108683452A (en) * | 2018-08-22 | 2018-10-19 | 惠安科培工业设计有限公司 | Fiber optic network fault detection system |
| CN112702113A (en) * | 2019-10-23 | 2021-04-23 | 中兴通讯股份有限公司 | Optical network detection method, system, electronic device and computer readable medium |
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| US5815295A (en) * | 1993-03-11 | 1998-09-29 | Lucent Technologies Inc. | Optical communication system with improved maintenance capabilities |
| US6108112A (en) * | 1997-03-19 | 2000-08-22 | Fujitsu Limited | Method and apparatus for failure recovery in passive optical network |
| CN2788461Y (en) * | 2004-11-15 | 2006-06-14 | 深圳市飞通宽带技术有限公司 | Remote end fiber transmitting-receiving device capable of detecting optical communication link circuit at any moment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5815295A (en) * | 1993-03-11 | 1998-09-29 | Lucent Technologies Inc. | Optical communication system with improved maintenance capabilities |
| US6108112A (en) * | 1997-03-19 | 2000-08-22 | Fujitsu Limited | Method and apparatus for failure recovery in passive optical network |
| CN2788461Y (en) * | 2004-11-15 | 2006-06-14 | 深圳市飞通宽带技术有限公司 | Remote end fiber transmitting-receiving device capable of detecting optical communication link circuit at any moment |
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