CN101304283A - Method and device for fault localization and safety prevention detection using passive optical network - Google Patents
Method and device for fault localization and safety prevention detection using passive optical network Download PDFInfo
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- CN101304283A CN101304283A CNA2008103025522A CN200810302552A CN101304283A CN 101304283 A CN101304283 A CN 101304283A CN A2008103025522 A CNA2008103025522 A CN A2008103025522A CN 200810302552 A CN200810302552 A CN 200810302552A CN 101304283 A CN101304283 A CN 101304283A
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Abstract
The invention relates to a distributed optical fiber sensor, which aims at the defect that the PON sensing system of the prior art cannot distinguish sensing information of each ONU branch. The invention discloses a method of using a passive optical network to do fault location and security-monitoring detection and a device thereof. The method of using the passive optical network to do fault location and security-monitoring detection comprises the following steps: a. sensing lasers with different wavelengths are injected into the PON according to a certain time interval; b. the sensing lasers with different wavelengths are correspondingly injected into each ONU branch at an ONU access end; c. the returned back Raleigh scattering lights from each ONU branch are received; d. the OTDR treatment to the received back Raleigh scattering lights is carried out. The invention also discloses the device of using the passive optical network to do fault location and security-monitoring detection. The invention can be applied in the fault location and security-monitoring detection in the PON system.
Description
Technical field
The present invention relates to distributed fiberoptic sensor, particularly the fault location in the EPON (PON) and the method and apparatus of safety detection.
Background technology
Next generation network (NGN) and Next Generation Internet (NGI), it is a kind of comprehensive open network framework that miscellaneous service can be provided, be one of the focus of the present world, home communications area research and advanced subject, also be the direction that the medium-term and long-term program for the development of science and technology emphasis of China's Eleventh Five-Year Plan is supported, wherein access network technology and switching technology are the emphasis of NGN and NGI research.The trend of China " light advances copper and moves back " is quickened, point-to-point application at the business user is universal day by day, PON has become FTTB, FTTC, FTTO, FTTH (optical fiber access technology, be referred to as FTTx, comprise Fiber to the building, Fiber tothe curb, Fiber to the office, Fiber to the home) best-of-breed technology.The PON of main flow comprises Ethernet PON (being called for short EPON) and Gigabit PON (being called for short GPON) at present, and its network topology structure comprises an OLT (light path terminal) and n ONU (optical network unit) as shown in Figure 1.Wherein all communication datas of ONU all need OLT to have enough to meet the need.
The transmission that optical fiber not only can be used for communicate optical signal as current a kind of crucial communications medium also has the function of light sensing simultaneously, can be used for the high-sensitivity detection of a plurality of parameters such as temperature, stress, vibration and can be applied to safety detection (as fire prevention, antitheft etc.).Optical fiber is transmission medium in the distributing optical fiber sensing technology, is again sensing element, and it can obtain the spatial distribution state and the time dependent information of measured parameter on the whole fiber lengths simultaneously.The English full name of OTDR is Optical Time Domain Reflectometer, and the Chinese meaning is optical time domain reflectometer.OTDR is that the backscattering that Rayleigh scattering when utilizing light to transmit in optical fiber and Fresnel reflection are produced carries out the technology that various relevant parameters are surveyed.Comprise phase sensitive optical time domain reflectometer (Phase-Sensitive Optical Time-Domain Reflectometer, be abbreviated as φ-OTDR) technology, polarization-optical time domain reflectometry (Polarization Optical Time Domain Reflectometer, be abbreviated as POTDR) technology and Brillouin light domain reflectometer (Brillouin Optical Time DomainReflectometer, be abbreviated as BODTR, a kind of stress sensitive transducer) technology.Utilize these technology can detect the minor variations of various parameters on the fibre circuit.The existing scheme that incorporates the OTDR technology in the PON system is to add bragg grating (FBG) to serve as a mark with the reflection different wave length in each ONU branch of PON without exception, and separates by the WDM receiver at receiving terminal at present.When certain branch produces fracture, this place will produce Fresnel reflection, and the FBG reverberation of this branch disappears simultaneously.Therefore, though adopted the distributed sensing technology, because the Rayleigh scattering light dorsad of each branch coincides together and can not separate, and its sensing light source is a wideband light source, so can only monitor the Cable's Fault in the PON structure, can not realize the security protection monitoring function.Its network configuration as shown in Figure 2.
Summary of the invention
Technical problem to be solved by this invention, just provide and a kind ofly (be abbreviated as WDM based on wavelength-division multiplex technique, comprise the dense wave division multipurpose that cost is higher--DWDM technology and lower-cost coarse wave division multiplexing technology--distributing optical fiber sensing Detection Techniques CWDM) can overcome the restriction of prior art.
The present invention solve the technical problem, and the technical scheme of employing is, utilizes EPON to carry out the method for fault location and safety detection, comprises the steps:
A. in PON, inject the sensing laser of different wave length according to certain time interval;
B. at ONU incoming end corresponding each ONU branch road that injects of sensing laser with different wave length;
C. receive the Rayleigh scattering light dorsad that each ONU branch road returns;
D. the Rayleigh scattering light dorsad that receives being carried out OTDR handles;
Utilize EPON to carry out the device of fault location and safety detection, comprise laser, modulator, circulator and processor, and by 1 OLT and n the PON that ONU constitutes;
Described laser is connected with modulator, injects sensing laser through ovennodulation by circulator to PON; Described circulator is connected with processor, is used to receive the Rayleigh scattering light dorsad and the input processor that return and handles;
It is characterized in that, also comprise n+2 CWDM and 1 DWDM; N CWDM is connected and all is connected with DWDM with N ONU respectively; One of other 2 CWDM are connected with DWDM, and one is connected with circulator, and the trunk cable by PON between them links to each other.
The invention has the beneficial effects as follows not only have high sensitivity, high-accuracy, and can be used for a plurality of users' invasion (antitheft) monitoring and temperature (fire prevention) monitoring simultaneously.
Description of drawings
Fig. 1 is a prior art PON schematic network structure;
Fig. 2 is the structural representation that incorporates the OTDR technology among the PON of prior art;
Fig. 3 is the structural representation of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The present invention adopts WDM technology, incorporates various distributed sensing technology in the PON network, as Φ-OTDR, BOTDR.In the transmission course of light, utilize DWDM to separate signal of communication and transducing signal with CWDM, avoided the rear orientation light luminous power of transducing signal to distribute, thereby improved signal to noise ratio.WDM technology is sent to different ONU branches with the sensing laser of the different wave length of tunable laser generation simultaneously, can monitor the situation that each ONU branch road optical cable is interfered respectively, has played the effect of each ONU branch of mark.
Utilize EPON to carry out the method for fault location and safety detection, comprise the steps:
A. in PON, inject the sensing laser of different wave length according to certain time interval;
B. at ONU incoming end corresponding each ONU branch road that injects of sensing laser with different wave length;
C. receive the Rayleigh scattering light dorsad that each ONU branch road returns;
D. the Rayleigh scattering light dorsad that receives being carried out OTDR handles;
Further, among the step a, described sensing laser is the laser through ovennodulation;
Concrete, among the step a, described time interval 〉=sensing laser in PON round-trip transmission time and processing time with;
Further, among the step b, with CWDM the different wavelength of laser correspondence is injected different ONU branch roads by DWDM;
Concrete, in the steps d, described OTDR handles, and comprises that φ-OTDR handles and BOTDR handles;
Further, step a is: periodically inject wavelength according to certain time interval in PON and be respectively λ
1, λ
2λ
nSensing laser; Step b is: is λ at the ONU incoming end with wavelength
1, λ
2λ
nA respectively corresponding ONU branch road, the 2nd ONU branch road of injecting of sensing laser ... n ONU branch road.
Utilize EPON to carry out the device of fault location and safety detection, comprise laser, modulator, circulator and processor, and by 1 OLT and n the PON that ONU constitutes;
Described laser is connected with modulator, injects sensing laser through ovennodulation by circulator to PON; Described circulator is connected with processor, is used to receive the Rayleigh scattering light dorsad and the input processor that return and handles;
It is characterized in that, also comprise n+2 CWDM and 1 DWDM; N CWDM is connected and all is connected with DWDM with n ONU respectively; One of other 2 CWDM are connected with DWDM, and one is connected with circulator, and the trunk cable by PON between them links to each other;
Concrete, described laser is a tunable laser;
Concrete, described trunk cable is a general single mode fiber;
Further, described processor comprises data collecting card and computer system, can carry out that φ-OTDR handles and the BOTDR processing to Rayleigh scattering light dorsad.
Embodiment
This routine system configuration as shown in Figure 3.This example adopts high-performance, tunable laser cheaply, characteristics such as have that live width is narrower, extinction ratio is high, centre wavelength is stable and response speed is fast.Tunable laser can carry out the real-time control of program by processor, according to the time interval of setting periodically emission wavelength be respectively λ
1, λ
2λ
nLaser signal as the sensing light source.
Particular moment tunable laser to send wavelength be λ
nSensing laser, after modulating by modulator, advance to insert the PON trunk cable with normal downlink communication laser coupled through CWDM (A).Modulator also with processor communication, be convenient to program control, thereby adjust intrusion detection precision and maximum monitoring distance with width and the repetition rate of adjusting modulating pulse.
Modulated sensing laser is by after CWDM (B) and the separation by laser of communicating by letter, and passing through DWDM is λ with wavelength
nSensing laser, inject n road ONU branch by CWDM (n) and realize various distributed sensings.The Rayleigh scattering light dorsad of sensing laser turns back to circulator from above-mentioned path in the optical fiber, separates back access processor through circulator and carries out Φ-OTDR and BOTDR processing, obtains safety detection and fiber failure signal.By the corresponding relation of wavelength and ONU branch, processor can failure judgement or the security protection alarm occur in which ONU branch, thereby finish the location.
Each ONU branch is embedded in the underground of ONU user (as single villa, perhaps sub-district) in the form of a ring, forms distributed sensing fiber.When these branches as distributed sensing fiber are interfered, the Rayleigh reverberation will be avoided optical loss through CWDM and uplink communication data separating dorsad.The sensing laser signal is finally got back to processor by a plurality of wavelength division multiplex devices, after surveying and handling the result is uploaded to OLT, provides value-added service for Surveillance center's use or by operator.
Present PON can provide 10M/100M Ethernet interface and F1/T1/POTS at the ONU incoming end, interfaces such as RF video.Based on the PON fault location and the safety-protection system of tunable laser and wavelength division multiplexing, operator concentrates digitized processing to the back of each ONU branch to Rayleigh scattering light, can monitor the security protection state in real time.Simultaneously can also provide multiple value-added service, be coupled among the OLT by E1/T1 Interface or Ethernet interface, enter the PON system and be transferred to concrete ONU branch, as operator sends command signal by OLT to specific ONU when fire alarm occurring, opens ONU user's fire prevention water valve etc.
Claims (10)
1. utilize EPON to carry out the method for fault location and safety detection, comprise the steps:
A. in PON, inject the sensing laser of different wave length according to certain time interval;
B. at ONU incoming end corresponding each ONU branch road that injects of sensing laser with different wave length;
C. receive the Rayleigh scattering light dorsad that each ONU branch road returns;
D. the Rayleigh scattering light dorsad that receives being carried out OTDR handles.
2. the method for utilizing EPON to carry out fault location and safety detection according to claim 1 is characterized in that, among the step a, described sensing laser is the laser through ovennodulation.
3. the method for utilizing EPON to carry out fault location and safety detection according to claim 1 is characterized in that, among the step a, described time interval 〉=sensing laser in PON round-trip transmission time and processing time and.
4. the method for utilizing EPON to carry out fault location and safety detection according to claim 1 is characterized in that, among the step b, with CWDM the different wavelength of laser correspondence is injected different ONU branch roads by DWDM.
5. the method for utilizing EPON to carry out fault location and safety detection according to claim 1 is characterized in that, in the steps d, described OTDR handles, and comprises that φ-OTDR handles and BOTDR handles.
6. according to any described method of utilizing EPON to carry out fault location and safety detection of claim 1～5, it is characterized in that step a is: periodically in PON, inject wavelength according to certain time interval and be respectively λ 1, λ 2 ... the sensing laser of λ n; Step b is: is λ 1, λ 2 at the ONU incoming end with wavelength ... a corresponding respectively ONU branch road, the 2nd ONU branch road of injecting of the sensing laser of λ n ... n ONU branch road.
7. utilize EPON to carry out the device of fault location and safety detection, comprise laser, modulator, circulator and processor, and by 1 OLT and n the PON that ONU constitutes;
Described laser is connected with modulator, injects sensing laser through ovennodulation by circulator to PON; Described circulator is connected with processor, is used to receive the Rayleigh scattering light dorsad and the input processor that return and handles;
It is characterized in that, also comprise n+2 CWDM and 1 DWDM; N CWDM is connected and all is connected with DWDM with n ONU respectively; One of other 2 CWDM are connected with DWDM, and one is connected with circulator, and the trunk cable by PON between them links to each other.
8. the device that utilizes EPON to carry out fault location and safety detection according to claim 7 is characterized in that, described laser is a tunable laser.
9. the device that utilizes EPON to carry out fault location and safety detection according to claim 7 is characterized in that, described trunk cable is a general single mode fiber.
10. according to claim 7, the 8 or 9 described devices that utilize EPON to carry out fault location and safety detection, it is characterized in that, described processor comprises data collecting card and computer system, can carry out that φ-OTDR handles and the BOTDR processing to Rayleigh scattering light dorsad.
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| CN101924590A (en) * | 2010-08-25 | 2010-12-22 | 中兴通讯股份有限公司 | Detection system and method of fiber fault of passive optical network |
| CN101924962A (en) * | 2010-08-25 | 2010-12-22 | 中兴通讯股份有限公司 | System and method thereof for detecting fiber faults |
| CN101984561A (en) * | 2010-11-15 | 2011-03-09 | 中兴通讯股份有限公司 | System and method for detecting optical fiber faults of passive optical network |
| CN102055523A (en) * | 2009-11-09 | 2011-05-11 | 中国移动通信集团江苏有限公司 | Method, equipment and system for diagnosing failure of passive optical network |
| WO2011057528A1 (en) * | 2009-11-13 | 2011-05-19 | Huawei Technologies Co., Ltd. | Tunable coherent optical time division reflectometry |
| CN102098098A (en) * | 2009-12-14 | 2011-06-15 | 中兴通讯股份有限公司 | System for detecting fiber faults of passive optical network |
| CN102104423A (en) * | 2009-12-22 | 2011-06-22 | 中兴通讯股份有限公司 | Fault detection method and system for multi-branch PON (Passive Optical Network) |
| CN102201861A (en) * | 2010-03-24 | 2011-09-28 | 中兴通讯股份有限公司 | Fault detection system and method based on long-distance passive optical network |
| WO2012024871A1 (en) * | 2010-08-23 | 2012-03-01 | 中兴通讯股份有限公司 | Method and optical line terminal for optical fiber fault diagnosis in passive optical network |
| CN102928740A (en) * | 2012-11-06 | 2013-02-13 | 江苏省电力公司无锡供电公司 | Intelligent collection type fault diagnosis and on-line temperature measuring system |
| CN101814951B (en) * | 2009-02-25 | 2013-11-06 | 中华电信股份有限公司 | High-density multiple-wavelength optical time domain reflectometer |
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