CN102684785B - Based on optical network fault checkout gear and the detection method thereof of noise signal - Google Patents
Based on optical network fault checkout gear and the detection method thereof of noise signal Download PDFInfo
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Abstract
A kind of optical network fault checkout gear based on noise signal and detection method thereof, device described in it is arranged in the trunk optical fiber between optical line terminal and Optical Distribution Network unit by noise source and signal processing unit, described noise source is the noise signal from on-line optical amplifier ASE noise or introducing, is positioned at optical line terminal side; Method described in it is the noise signal utilizing image intensifer ASE noise or introducing in optical fiber main line, be coupled in each branch of optical-fiber network by wavelength division multiplexer and detect, the light signal of respective branch to be detected is leached by reflective tunable filter, the detectable signal returned and reference signal are carried out relevant treatment at signal processing unit, realizes fault location by the correlation peak of correlation curve.The present invention utilizes noise wide spectral characteristics, realizes detecting the in good time tuning on-line of Wave division multiplexing passive optical network, and structure is simple, easy to operate, and optical network fault detects accurately.
Description
Technical field
The present invention relates to a kind of optical network fault checkout gear and detection method thereof, more specifically, is a kind of optical network fault checkout gear and detection method thereof of utilizing noise signal.
Background technology
In various broadband access technology, the advantages such as EPON (PON) is large with its capacity, transmission range length, low cost, full-service support become one of current hot technology.PON is a kind of point-to-multipoint network, mainly comprises three parts: optical line terminal OLT, Optical Distribution Network ODN and optical-fiber network subscriber unit ONU.Due to the topological structure of this multiple-limb of PON, bring very large challenge to the detection of network failure, in order to ensure the stability of fiber optic network work, the fault quick and precisely in locating lines is particularly important.
Existing optical network fault detects and mainly utilizes the optical time domain reflectometer of Single wavelength (OTDR) to detect, this detection means can only be used for the Network Fault Detection of point-to-point, for the point-to-multipoint topological structure of PON, branch detection can only be carried out, workload is large, and detection has relative hysteresis quality, can not detect in real time.
In order to realize the Real-Time Monitoring of passive optical network PON, existing technological means mainly utilizes the OTDR of multi-wavelength.Mainly contain following several:
Utilize the OTDR of laser as light source of tunable wave length, publication number is " a kind of fault detection method of multiple-limb EPON and the system " of CN102104423A, the laser of its tunable wave length can export different wavelength, the light of different wave length enters different network branches, and then reaching the object that heterogeneous networks branch road is detected, the laser that this scheme introduces tunable wave length involves great expense; Utilize many longitudinal modes FP laser (Ju-Hee Park, Jin-Serk Baik, and Chang-Hee Lee, Fault-detection technique in a WDM-PON,
optics Express,2007, Vol.15, No.4, pp:1461 – 1466), the light that FP laser produces has multiple wavelength, therefore also can be detected different network branches by different wavelength, spectrum due to FP laser is not continuous print, there is certain mode spacing, and consider that detection center wavelength of light must be corresponding with the centre wavelength of wavelength division multiplexer in ODN unit, the wavelength that can be used for branch of a network detection is very limited; Utilize noise signal as signal source (Madhan Thollabandi, Tae-Young Kim, Swook Hann, Chang-Soo Park, Tunable OTDR Based on Direct Modulationof Self-Injection-Locked RSOA for In-Service Monitoring of WDM-PON
photonics Technology Letters2008, Vol. 20, No. 15, pp:1323 – 1325), noise has very wide spectrum, its spectrum comprises the centre wavelength of each ONU branch branch road, and spectrum is continuous print, therefore can be detected heterogeneous networks branch road by the noise signal of different wave length, but existing method needs to carry out pulse modulation to noise signal, makes complex structure.
What the OTDR of above-mentioned multi-wavelength all adopted is pulse modulation, and Measurement Resolution is not high, and measuring distance and range resolution ratio exist the contradiction in principle.In order to solve the contradiction of measuring distance and range resolution ratio, by sending pseudo random sequence, as adopted Gray code, bi-orthogonal coded etc., correlation method process is adopted to reach this purpose, as Shen Donghui, Xie Weilin, Dong Yi, He Hao, Hu Weisheng, the tunable wave length OTDR based on bi-orthogonal coded studies
optical communication technique, 2010, Vol.34, No.4, pp:39-41, but the code element of pseudo random sequence is limited to electronic bottleneck, and certainty of measurement cannot break through, simultaneously its complex structure.
In first technology, publication number is " a kind of passive optical network fault checkout gear and the detection method thereof " of CN102291173A, disclose one chaos light as flashlight, carry out fault detect and location by correlation method, and demonstrate its feasibility by experiment.
Along with the development of optical fiber communication, fiber optic network is tending towards miniaturized, has higher requirement to the resolution of Network Fault Detection, precision.The present invention in conjunction with existing technology, will propose a kind of new high-resolution, high accuracy, the simple Detection Techniques of structure, and can realize on-line checkingi.
Summary of the invention
The invention provides a kind of optical network fault checkout gear based on noise signal and detection method thereof, with solve in prior art utilize noise carry out EPON detect need to carry out pulse modulation, complex structure, the problem that resolution is low.
Realize above-mentioned purpose, the present invention adopts a kind of based on the optical network fault checkout gear of noise signal and the technical scheme of detection method thereof.Wherein:
Based on an optical network fault checkout gear for noise signal, comprise noise source and signal processing unit; Noise source described in it and signal processing unit are arranged in the trunk optical fiber between optical line terminal OLT and Optical Distribution Network unit ODN;
Described noise source is that it is positioned at optical line terminal OLT side, from on-line optical amplifier amplified spont-aneous emission ASE noise, or the noise source introduced; Its noise source spectral component includes the centre wavelength of each branch of a network;
Described signal processing unit is divided into two-way by coupler I, and a road is photodetector I, A/D converter I and signal processing apparatus successively; Another road is transmission-type tunable filter, photodetector II, A/D converter II and signal processing apparatus successively; Or
Be be divided into two-way by coupler I, a road is photodetector I, A/D converter I and signal processing apparatus successively; Another road connects reflecting filter; Or
Be after being coupled into a road by coupler I and coupler, connect transmission-type tunable filter, photodetector II, A/D converter II and signal processing apparatus; Or
Be after being coupled into a road by coupler I and coupler II, connect circulator, reflective tunable filter, photodetector II, A/D converter II and signal processing apparatus.
A kind of detection method for the above-mentioned optical network fault checkout gear based on noise signal, detection method described in it utilizes image intensifer amplified spont-aneous emission (ASE) noise in optical fiber main line, or the noise source introduced, be coupled in each branch of optical-fiber network by wavelength division multiplexer and detect, the light signal of respective branch to be detected is leached by tunable filter, the detectable signal returned and reference signal are carried out relevant treatment at signal processing unit, realizes fault location by the correlation peak of correlation curve.
Technical characteristic attached in above-mentioned detection method technical scheme is: the wavelength regulation scope of described transmission-type tunable filter, reflective tunable filter is greater than the scope of contained wavelength in optical-fiber network, can leach the light signal of corresponding wavelength in each branch road; The noise source of described introducing is spontaneous emission noise, noise signal generator or the noise of semiconductor amplifier that erbium-doped fiber produces.
Realize above-mentioned a kind of of the present invention utilize noise signal and based on the passive optical network fault checkout gear of related operation and detection method thereof, compared with existing EPON detection technique, there is following advantage and good effect:
Utilize ASE noise that the on-line optical amplifier in network trunk optical optical fiber produces as wide spectrum light source, eliminate expensive detection light source, and do not need to do some modulation treatment to noise signal, simplify device, saved cost.
Carry out fault location by correlation method, the bandwidth of signal determines relevant characteristic, and the broadband character of noise signal provides the fiber laser arrays of high spatial resolution, and spatial resolution is high.
Utilize noise wide spectral characteristics, achieve and detect the in good time tuning on-line of Wave division multiplexing passive optical network, and structure is simple, easy to operate, optical network fault detects accurately.
Accompanying drawing explanation
Fig. 1 is the basic structure schematic diagram of passive optical network PON of the present invention.
Fig. 2 is the basic structure schematic diagram of Network Fault Detection device of the present invention.
Fig. 3 is the structural representation of first embodiment of the invention Network Fault Detection device.
Fig. 4 is the structural representation of second embodiment of the invention Network Fault Detection device.
Fig. 5 is the structural representation of third embodiment of the invention Network Fault Detection device.
Fig. 6 is the structural representation of fourth embodiment of the invention Network Fault Detection device.
In figure: 1: noise source; 2: coupler I; 3: transmission-type tunable filter; 4: photodetector I; 5: photodetector II; 6:A/D transducer I; 7:A/D transducer II; 8: signal processing apparatus; 9: reflective tunable filter; 10: coupler II; 11: circulator.
Embodiment
For making failure detection schemes of the present invention, technique effect more clear, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
First embodiment
Implement a kind of optical network fault checkout gear based on noise signal of the present invention, device described in it is applicable to the EPON of wavelength division multiplexing.
As described in Figure 1, the structural representation of EPON is provided, wherein, optical line terminal OLT, launch signal of communication, the communication wavelength division multiplexer in Optical Distribution Network unit ODN carries out signal distribution, and the signal after distribution enters into optical-fiber network subscriber unit ONU through network objectives path.
As described in Figure 2, a kind of EPON checkout gear of the present invention, is positioned at optical line terminal OLT side, comprises noise source and signal processing unit.
As described in Figure 3, noise source 1 of the present invention is from amplified spont-aneous emission (ASE) noise of the on-line optical amplifier in optical fiber main line, or the noise source introduced; The noise source of described introducing is spontaneous emission noise, noise signal generator or the noise of semiconductor amplifier that erbium-doped fiber produces; Described signal processing unit is made up of coupler I 2, transmission-type tunable filter 3, photodetector I 4, photodetector II 5, A/D converter I 6, A/D converter II 7 and signal processing apparatus 8.The wavelength regulation scope of described transmission-type tunable filter 3 is greater than the scope of contained wavelength in optical-fiber network, can leach the light signal of corresponding wavelength in each branch road.
Due to the wide spectral characteristics of noise, its spectrum comprises the centre wavelength of each ONU branch branch road, therefore can detect different branch of a networks by the noise signal of different wave length; Its autocorrelator trace has desirable " drawing pin " shape, and less on signal of communication impact as the noise in channel, can be used for carrying out on-line checkingi; As detection light, a part enters into branch of a network to be detected as detectable signal by wavelength division multiplexer in Optical Distribution Network unit ODN, when there is fault point in branch road, fault point can produce echo-signal, echo-signal passes trunk optical fiber back, enters photodetector I 4 via coupler I 2; A part enters transmission-type tunable filter 3 as with reference to signal by coupler I 2, the centre wavelength of transmission-type tunable filter 3 is regulated to make it consistent with the centre wavelength of network under test branch road, leach the signal with branch of a network phase co-wavelength to be detected, change into the signal of telecommunication through photodetector II 5, suppose that its output meets functional relation
, then convert digital signal entering signal processing unit 8, road detectable signal to by A/D converter II 7 and change into the signal of telecommunication through photodetector I 4, suppose that two-way time is
, its output meets functional expression
, then convert digital signal entering signal processing unit 8 to by A/D converter I 6; At signal processing apparatus 8, by computer or digital correlation instrument, two paths of signals is carried out related operation, its correlation function is
, only have to meet and work as
time, correlation function is existence anduniquess peak value, then basis
obtain the particular location of fault point, the full width at half maximum of correlation curve determines spatial resolution, and the bandwidth of signal determines again the full width at half maximum of correlation curve, because noise signal bandwidth is higher, therefore can realize high spatial resolution and the high accuracy of measurement.
A kind of detection method of the checkout gear of the EPON of noise signal that utilizes implementing the present invention above-mentioned is as follows.Method described in it to utilize in optical fiber main line the ASE noise of on-line optical amplifier or the noise source of introducing as signal source; The noise signal part produced is as reference signal, and a part is as detectable signal, and detectable signal is coupled in each branch of optical-fiber network by the wavelength division multiplexer in Optical Distribution Network unit ODN, runs into fault back reflection and returns signal processing unit; Regulate tunable filter to carry out filtering according to the centre wavelength of each branch road and determine branch road to be detected, by the detectable signal be reflected back with carry out related operation through filtered reference signal, when there is fault point in this branch road, correlation curve corresponds to fault point and has relevant peaks appearance, carry out the fault of Sampling network branch road with this and position, and realizing on-line checkingi.
Second embodiment
On the basis of the first embodiment, as described in Figure 4, to the second embodiment signal processing unit described in it be made up of coupler I 2, reflective tunable filter 9, photodetector I 4, A/D converter I 6 and signal processing apparatus 8.Wherein, a road reference signal is by entering into photodetector I 4 by coupler I 2 again after the filtering of reflective tunable filter 9, and by carrying out auto-correlation computation to realize location to the signal gathered, other is same as the first embodiment.This embodiment changes transmission-type tunable filter 3 into reflective tunable filter 9, signal processing unit structure can be made simpler compared with the first embodiment.
3rd embodiment
On the basis of the first embodiment, as described in Figure 5, to the 3rd embodiment signal processing unit described in it be made up of coupler I 2, coupler II 10, transmission-type tunable filter 3, photodetector II 5, A/D converter II 7 and signal processing apparatus 8.Reference signal and the detectable signal returned are coupled into a road signal by coupler I 2 and coupler II 10, and the signal of collection is carried out auto-correlation computation, and other is same as the first embodiment.This embodiment, when not changing transmission-type tunable filter 3, makes to simplify the structure by coupling optical path.
4th embodiment
On the basis of the first embodiment, 4th embodiment as described in Figure 6, signal processing unit described in phase is made up of coupler I 2, coupler II 10, circulator 11, reflective tunable filter 9, photodetector II 5, A/D converter II 7 and signal processing apparatus 8, signal coupler I 2 and coupler II 10 being coupled into a road enters reflective tunable filter 9 through circulator 11, filtered signal enters photodetector II 5 by circulator 11, and other is with the first embodiment.This embodiment changes transmission-type tunable filter 3 into reflective tunable filter 9, is not having can adopt the method under transmission-type filter condition.
Claims (5)
1., based on an optical network fault checkout gear for noise signal, described device comprises noise source and signal processing unit; Wherein noise source exports detectable signal by after noise signal input signal processing unit, detectable signal is coupled in each branch of wavelength division multiplexed network by Optical Distribution Network unit ODN and detects, the reverberation of fault point is back to signal processing unit along former road, fault branch is determined by the transmission-type tunable filter (3) in described signal processing unit or reflective tunable filter (9), noise signal incident in signal processing unit afterwards and the noise signal returned carry out relevant treatment, realize fault location by the correlation peak location of correlation curve;
Described noise source and signal processing unit are arranged in the trunk optical fiber between optical line terminal OLT and Optical Distribution Network unit ODN;
Described noise source is positioned at optical line terminal OLT side, from on-line optical amplifier amplified spont-aneous emission ASE noise, or the noise source introduced; Spontaneous radiation ASE noise or noise source spectral component include the centre wavelength of each branch of a network;
Described signal processing unit comprises coupler I(2), transmission-type tunable filter (3), photodetector I(4), photodetector II(5), A/D converter I(6), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel through transmission-type tunable filter (3), leach the light identical with branch road wavelength to be measured and be converted to the signal of telecommunication through photodetector II (5) again, and by the final Injection Signal processing unit (8) of A/D converter II (7); After optical-fiber network is injected on another road, the flashlight reflected by branch road to be measured is through coupler I(2) be coupled into photodetector I (4) and be converted into the signal of telecommunication, enter described signal processing apparatus (8) through A/D converter I (6) again, in signal processing apparatus (8), carry out computing cross-correlation;
Or comprise coupler I(2), reflective tunable filter (9), photodetector I(4), A/D converter I(6) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), and a road connects reflective tunable filter (9), leaches the wavelength of branch road to be measured, enters described coupler I(2 as with reference to signal reflex); After optical-fiber network is injected on another road, the flashlight reflected by branch road to be measured injects described coupler I(2 equally), and be coupled to photodetector I (4) in the lump with reference signal before and be converted into the signal of telecommunication, enter described signal processing apparatus (8) through A/D converter I (6) again, then carry out auto-correlation computation in signal processing apparatus (8);
Or comprise coupler I(2), coupler II(10), transmission-type tunable filter (3), photodetector II(5), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel is as reference light, after optical-fiber network is injected on another road, the flashlight reflect branch road to be measured and described reference light are together coupled into coupler II(10) form a road after, the light signal that connection transmission-type tunable filter (3) leaches branch road wavelength to be measured is converted to the signal of telecommunication through photodetector II (5), through A/D converter II (7) entering signal processing unit (8), then carry out auto-correlation computation in signal processing apparatus (8);
Or comprise coupler I(2), coupler II(10), circulator (11), reflective tunable filter (9), photodetector II(5), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel is as reference light, after optical-fiber network is injected on another road, the flashlight reflect branch road to be measured and described reference light are together coupled into coupler II(10) form a road after, connect circulator (11) and reflective tunable filter (9), the light signal leaching branch road wavelength to be measured is back to described circulator (11), enter photodetector II (5) and be converted to the signal of telecommunication, through A/D converter II (7) entering signal processing unit (8), then carry out auto-correlation computation in signal processing apparatus (8).
2., as claimed in claim 1 based on the optical network fault checkout gear of noise signal, described in it, the wavelength regulation scope of transmission-type tunable filter (3), reflective tunable filter (9) comprises the centre wavelength of each branch of a network.
3., as claimed in claim 1 based on the optical network fault checkout gear of noise signal, the noise source introduced described in it is spontaneous emission noise, noise signal generator or the noise of semiconductor amplifier that erbium-doped fiber produces.
4., as claimed in claim 1 based on the optical network fault checkout gear of noise signal, described in it, Optical Distribution Network unit ODN is communication wavelength division multiplexer.
5. the detection method for the optical network fault checkout gear based on noise signal, detection method described in it exports detectable signal after noise signal input signal processing unit, detectable signal is coupled in each branch of wavelength division multiplexed network by Optical Distribution Network unit ODN, detect, the reverberation of fault point is back to signal processing unit along former road, fault branch is determined by the transmission-type tunable filter (3) in described signal processing unit or reflective tunable filter (9), noise signal incident in signal processing unit afterwards and the noise signal returned carry out relevant treatment, fault location is realized by the correlation peak location of correlation curve,
Described noise source and signal processing unit are arranged in the trunk optical fiber between optical line terminal OLT and Optical Distribution Network unit ODN;
Described noise source is positioned at optical line terminal OLT side, from on-line optical amplifier amplified spont-aneous emission ASE noise, or the noise source introduced; Spontaneous radiation ASE noise or noise source spectral component include the centre wavelength of each branch of a network;
Described signal processing unit comprises coupler I(2), transmission-type tunable filter (3), photodetector I(4), photodetector II(5), A/D converter I(6), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel through transmission-type tunable filter (3), leach the light identical with branch road wavelength to be measured and be converted to the signal of telecommunication through photodetector II (5) again, and by the final Injection Signal processing unit (8) of A/D converter II (7); After optical-fiber network is injected on another road, the flashlight reflected by branch road to be measured is through coupler I(2) be coupled into photodetector I (4) and be converted into the signal of telecommunication, enter described signal processing apparatus (8) through A/D converter I (6) again, in signal processing apparatus (8), carry out computing cross-correlation;
Or comprise coupler I(2), reflective tunable filter (9), photodetector I(4), A/D converter I(6) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), and a road connects reflective tunable filter (9), leaches the wavelength of branch road to be measured, enters described coupler I(2 as with reference to signal reflex); After optical-fiber network is injected on another road, the flashlight reflected by branch road to be measured injects described coupler I(2 equally), and be coupled to photodetector I (4) in the lump with reference signal before and be converted into the signal of telecommunication, enter described signal processing apparatus (8) through A/D converter I (6) again, then carry out auto-correlation computation in signal processing apparatus (8);
Or comprise coupler I(2), coupler II(10), transmission-type tunable filter (3), photodetector II(5), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel is as reference light, after optical-fiber network is injected on another road, the flashlight reflect branch road to be measured and described reference light are together coupled into coupler II(10) form a road after, the light signal that connection transmission-type tunable filter (3) leaches branch road wavelength to be measured is converted to the signal of telecommunication through photodetector II (5), through A/D converter II (7) entering signal processing unit (8), then carry out auto-correlation computation in signal processing apparatus (8);
Or comprise coupler I(2), coupler II(10), circulator (11), reflective tunable filter (9), photodetector II(5), A/D converter II(7) and signal processing apparatus (8); Wherein noise light signal is divided into two-way by coupler I (2), one tunnel is as reference light, after optical-fiber network is injected on another road, the flashlight reflect branch road to be measured and described reference light are together coupled into coupler II(10) form a road after, connect circulator (11) and reflective tunable filter (9), the light signal leaching branch road wavelength to be measured is back to described circulator (11), enter photodetector II (5) and be converted to the signal of telecommunication, through A/D converter II (7) entering signal processing unit (8), then carry out auto-correlation computation in signal processing apparatus (8).
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| CN105467188B (en) * | 2014-09-05 | 2018-09-14 | 马鞍山万兆科技有限公司 | A kind of all-fiber current sensor using segmented light path fault diagnosis |
| CN104202084B (en) * | 2014-09-30 | 2016-06-29 | 太原理工大学 | A kind of device and method monitoring TDM optical network link failure |
| CN107749777A (en) * | 2017-11-22 | 2018-03-02 | 朱秋华 | A kind of fiber failure positioner and Fault Locating Method |
| CN112835057B (en) * | 2020-12-31 | 2024-04-19 | 太原理工大学 | Vehicle-mounted radar ranging system and method based on mid-infrared laser |
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