CN102790644A - Optical fiber detection system, optical fiber detection device and method thereof - Google Patents
Optical fiber detection system, optical fiber detection device and method thereof Download PDFInfo
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- CN102790644A CN102790644A CN2012102882619A CN201210288261A CN102790644A CN 102790644 A CN102790644 A CN 102790644A CN 2012102882619 A CN2012102882619 A CN 2012102882619A CN 201210288261 A CN201210288261 A CN 201210288261A CN 102790644 A CN102790644 A CN 102790644A
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Abstract
The embodiment of the invention provides an optical fiber detection system, an optical fiber detection device and a method thereof. The system comprises an optical line terminal (OLT) which is connected through an optical fiber and a plurality of optical network units (ONUs), wherein at least one level light splitter is arranged between the OLT and each ONU; a band pass filter with different transmission wavelengths is respectively arranged on each branch optical fiber from the output end of a first-level light splitter to the input end of the last level light splitter; an optical path selecting device is plugged between the output end of the last level light splitter and the ONU to form a main light path from the light path selecting device to the OLT and a branch light path from the light path selecting device to the ONU; and a detector is connected with the light path selecting device and is used for transmitting test light and acquiring the property of each light path according to the reflected test light. According to each embodiment of the invention, as long as different band pass filters with different transmission wavelengths are arranged on each branch optical fibers from the output end of the first level light splitter to the input end of the last level light splitter, the difficulty in construction can be reduced to a certain extent.
Description
Technical field
The present invention relates to optical communication technique, relate in particular to a kind of fiber optic detection system, optical fiber detector and method thereof.
Background technology
In recent years, optical fiber communication relies on advantages such as its cost is low, antijamming capability is strong, and transmission rate is fast to obtain development at full speed, simultaneously, it is detected a research focus that also becomes this area with maintenance.
For the EPON of putting multiple spot (Passive Optical Network, hereinafter to be referred as detection PON), at present methods that adopt all are to accomplish at local side more; Promptly; Local side with optical time domain reflectometer (Optical Time Domain Reflectomter, hereinafter to be referred as: OTDR) send test signal, test signal switches to tested light path through optical switch; End (ONU) back reflection that test signal arrives the PON network returns local side; The OTDR of local side analyzes the light path characteristic of tested light path through receiving the test signal that former road is returned, yet; When the test signal of different branches was returned local side simultaneously, common OTDR can't extract the information of each branch from the signal of stack.Prior art is employed in Fiber Bragg Grating FBG (the Fiber Brogg Grating that each branches end is connected in series different reflection wavelengths; Hereinafter to be referred as: FBG), send the light signal corresponding as test signal, import successively in the tested light path with the FBG of each reflection wavelength with tunable light source; Obtain the first corresponding reflected signal of each test signal; Tunable light source sends the reference wave that is different from each FBG reflection wavelength again, imports in the tested light path, obtains second reflected signal; Deduct second reflected signal respectively with each first reflected signal, can obtain the light path characteristic of each fiber optic tap.
Yet in the process of embodiment of the present invention embodiment, the inventor finds in the prior art owing to will can bring great challenge to construction at the FBG of the different reflection wavelengths of the terminal serial connection of each fiber optic tap.
Summary of the invention
The embodiment of the invention provides a kind of fiber optic detection system on the one hand, comprising:
Optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber are provided with one-level optical splitter at least between said OLT and the said ONU;
On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that said first band pass filter is connected, the corresponding transmission peak wavelength sum of said each second band pass filter is the transmission peak wavelength of said first band pass filter; The rest may be inferred;
In the end be inserted with a light path choice device between the output of one-level optical splitter and the said ONU; Form the trunk light path of said OLT, and said ONU is to branch's light path of said light path choice device through optical splitter to the said light path choice device of said one-level at least;
Also comprise the detector that is connected with said light path choice device, be used for sending test light, and control said light path choice device and select trunk light path to be detected, obtain the characteristic of trunk light path according to the test light that reflects to said light path choice device; And control said light path choice device and select branch's light path to be detected, obtain the characteristic of branch's light path according to the test light that reflects; Said test light comprises the transmission peak wavelength of all band pass filters at least;
Said light path choice device is used for the test light that said detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to said detector.
The embodiment of the invention provides a kind of on the other hand and carries out the method that optical fiber detects based on said system, comprising:
Testing process to the trunk light path comprises: said detector sends test light; Test light outputs in the trunk light path to be detected through said light path choice device, and the band pass filter through optical splitters at different levels arrive in the process of OLT and after arriving OLT constantly former road return; The test light that said light path choice device returns said trunk light path to be detected sends to said detector, analyzes the characteristic of the optic path of said trunk light path to be detected through said detector;
Testing process to branch's light path comprises: said detector sends test light, and test light outputs in branch's light path to be detected through said light path choice device, and constantly former road is returned in the process that arrives ONU and after arriving ONU; The test light that said light path choice device returns said branch's light path to be detected sends to said detector, analyzes the characteristic of the optic path of said branch's light path to be detected through said detector.
The embodiment of the invention provides a kind of optical fiber detector more on the one hand; Be applicable to and detect a fibre system; Said fibre system comprises optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber, is provided with one-level optical splitter at least between said OLT and the said ONU; On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that said first band pass filter is connected, the corresponding transmission peak wavelength sum of said each second band pass filter is the transmission peak wavelength of said first band pass filter; The rest may be inferred;
Said optical fiber detector comprises interconnective light path choice device and detector; Wherein, Said light path choice device is arranged between the output and said ONU of afterbody optical splitter in the said fibre system; Form the trunk light path of said OLT, and said ONU is to branch's light path of said light path choice device through optical splitter to the said light path choice device of said one-level at least;
Said detector is used for sending test light to said light path choice device, and controls said light path choice device and select trunk light path to be detected, obtains the characteristic of trunk light path according to the test light that reflects; And control said light path choice device and select branch's light path to be detected, obtain the characteristic of branch's light path according to the test light that reflects; Said test light comprises the transmission peak wavelength of all band pass filters at least;
Said light path choice device is used for the test light that said detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to said detector.
The fiber optic detection system that the embodiment of the invention provides, optical fiber detector and method thereof; Through one-level optical splitter in the end and ONU between insert a light path choice device; Form the trunk light path of light path choice device, and the light path choice device is to branch's light path of ONU to OLT; Also have a detector to be connected, be used to send test light, and obtain the characteristic of each light path according to the test light that reflects with this light path choice device; Because the position of light path choice device is inserted between afterbody optical splitter and the ONU; With the PON network branches characteristic test of putting multiple spot; Changed branch's characteristic test of point-to-point into; Thereby, need the band pass filter with different transmission peak wavelengths be set on each branch's light path, reduced difficulty of construction to a certain extent.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the light path choice device structural representation of fiber optic detection system embodiment provided by the invention;
Fig. 2 is the logical construction sketch map of 1:32 two-stage splitting network fiber optic detection system embodiment provided by the invention;
Fig. 3 is the detection trunk light path sketch map of optical fiber detecting method embodiment provided by the invention;
Fig. 4 is the detection branches light path sketch map of optical fiber detecting method embodiment provided by the invention;
Fig. 5 is the transmission sketch map of the professional light of optical fiber detecting method embodiment provided by the invention;
Fig. 6 is the logical construction sketch map of the two-stage splitting network system embodiment of a plurality of central offices provided by the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The fiber optic detection system that the embodiment of the invention provides comprises:
Optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber are provided with one-level optical splitter at least between said OLT and the said ONU;
When in the fibre circuit that connects OLT and ONU during only through an optical splitter, this optical-fiber network is the one-level splitting network.
When in the fibre circuit that connects OLT and ONU during through two optical splitters, this optical-fiber network is the two-stage splitting network.From OLT to ONU, first optical splitter of process is a first order optical splitter, and second optical splitter of process is second level optical splitter.
When in the fibre circuit that connects OLT and ONU during through three and above optical splitter; This optical-fiber network is multistage splitting network; From OLT to ONU, first optical splitter of process is a first order optical splitter successively, and second optical splitter of process is second level optical splitter; And the like, N optical splitter of process is N level optical splitter.
From OLT to ONU, successively in the optical splitter of process after through optical splitter be previous subordinate's optical splitter, be subordinate's optical splitter of first order optical splitter like second level optical splitter.
On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that said first band pass filter is connected, the corresponding transmission peak wavelength sum of said each second band pass filter is the transmission peak wavelength of said first band pass filter; The rest may be inferred;
As in the one-level splitting network, band pass filter need be set.
In two-stage beam split networking; First order optical splitter like 1:32 is the beam split ratio of 1:4; Second level optical splitter is the beam split ratio of 1:8, and the band pass filter of 4 different wave lengths then is set on 4 optical fiber of first order optical splitter output, is respectively λ like wavelength
1, λ
2, λ
3, λ
4
In three grades of splitting networks; First order optical splitter like 1:128 is the beam split ratio of 1:4; Second level optical splitter is the beam split ratio of 1:4; Third level optical splitter is the beam split ratio of 1:8, then on 4 branch optical fibers of first order optical splitter output, is connected in series 4 first different band pass filters respectively, and transmission peak wavelength is respectively λ
1, λ
2, λ
3, λ
4Second band pass filter of 4 different wave lengths is set on 4 optical fiber of first optical splitter output of the second level, is respectively λ like wavelength
11, λ
12, λ
13, λ
14The band pass filter of 4 different wave lengths is set on 4 optical fiber of second the optical splitter output in the second level, is respectively λ like wavelength
21, λ
22, λ
23, λ
24The band pass filter of 4 different wave lengths is set on 4 optical fiber of the 3rd the optical splitter output in the second level, is respectively λ like wavelength
31, λ
32, λ
33, λ
34The band pass filter of 4 different wave lengths is set on 4 optical fiber of the 4th the optical splitter output in the second level, is respectively λ like wavelength
41, λ
42, λ
43, λ
44, wherein in first band pass filter, λ
1=λ
11+ λ
12+ λ
13+ λ
14λ
2=λ
21+ λ
22+ λ
23+ λ
24λ
3=λ
31+ λ
32+ λ
33+ λ
34λ
4=λ
41+ λ
42+ λ
43+ λ
44In multistage splitting network, the method to set up of band pass filter is identical with three grades of splitting networks, no longer illustrates at this.
In the end be inserted with a light path choice device between the output of one-level optical splitter and the said ONU; Form the trunk light path of said OLT, and said ONU is to branch's light path of said light path choice device through optical splitter to the said light path choice device of said one-level at least; Said light path choice device can only be selected a light path at every turn.Also comprise the detector that is connected with said light path choice device, be used for sending test light, and control said light path choice device and select trunk light path to be detected, obtain the characteristic of trunk light path according to the test light that reflects to said light path choice device; And control said light path choice device and select branch's light path to be detected, obtain the characteristic of branch's light path according to the test light that reflects; Said test light comprises the transmission peak wavelength of all different band bandpass filters at least; As in the two-stage splitting network of above-mentioned 1:32 (first order is 1:4, and the second level is 1:8), used test light comprises that at least wavelength is λ
1, λ
2, λ
3, λ
4The intersection of light, as in three grades of splitting networks of above-mentioned 1:128, used test light comprises that at least wavelength is λ
1, λ
2, λ
3, λ
4λ wherein
1=λ
11+ λ
12+ λ
13+ λ
14λ
2=λ
21+ λ
22+ λ
23+ λ
24λ
3=λ
31+ λ
32+ λ
33+ λ
34λ
4=λ
41+ λ
42+ λ
43+ λ
44The intersection of light.
Said light path choice device is used for the test light that said detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to said detector.Information such as the light intensity of detector through reflecting, distance are known the light path characteristic of each trunk light path and branch's light path.
The fiber optic detection system that the embodiment of the invention provides is inserted in the light path choice device between the afterbody optical splitter and ONU of splitting network, and the PON network branches characteristic test with putting multiple spot has changed the test of point-to-point into; Through on each optical fiber at the input of output to the afterbody optical splitter of first order optical splitter; Band pass filter with different transmission peak wavelengths is set respectively; Be used to obtain the port numbers of each corresponding optical splitter, be convenient to the identification of fault optical fiber with carry out maintenance work.Detector is through sending test light in said light path choice device; Reflect it in corresponding the trunk light path and branch's light path; And the test light that the trunk light path that receives or branch's light path reflect reflexed in the light path choice device; And sending to detector, detector analyzes the corresponding trunk light path or the characteristic of branch's light path.The fiber optic detection system of the embodiment of the invention need not be provided with band pass filter on branch's light path that the light path choice device is connected with ONU, reduced difficulty of construction to a certain extent.
Fig. 1 is the light path choice device structural representation of fiber optic detection system embodiment provided by the invention; As shown in Figure 1; In above-mentioned fiber optic detection system embodiment; The light path choice device comprises second convex lens 4 and the 3rd convex lens 5 that the lens arra 1 that is connected with each optical fiber that sets gradually, sphere are oppositely arranged towards first convex lens 2, optical filter 3, the sphere of lens arra, and the reflective optical system 6 that is used to regulate the light reflection angle.Above-mentioned optical filter 3 can reflect the professional light more than 90%, can the whole test light of transmission, and therefore, in the process that optical fiber detects, test light can not impact the normal transmission of professional light.
It is coaxial that light path choice device above-mentioned respectively installed central point, and photodetector is to the central optical fiber input test light (being positioned on the central axis) of 2-D optical fibre array 7, and scioptics array 1 makes the central point of test light normal sheaf first convex lens 2; Test light is passed optical filter 3 successively with same direction, and above-mentioned optical filter 3 can reflect the professional light more than 90%, can the whole test light of transmission; Pass second convex lens 4 and the 3rd convex lens 5 then, arrive the reflective optical system 6 that is placed on the 3rd convex lens 5 focal planes, above-mentioned focal plane is meant and is positioned at the plane of along perpendicular to primary optical axis; The adjustable angle of reflective optical system 6; Reflex to the 3rd convex lens 5 according to different angles, through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4; Through second convex lens 4; Test light converges at the optical filter 3 that is placed on the focal plane, does not change direction and passes optical filter directive first convex lens 2, through first convex lens 2; Be parallel to primary optical axis directive branch's light path or trunk light path, realize the light path selection.The test light input photodetector that test light has former road to reflect in tested optic path process.
In the fiber optic detection system that the embodiment of the invention provides, said band pass filter can be the chirp grating of windowing or the filter plate of plated film, and its operation principle is the light of transmission specific wavelength.
In the fiber optic detection system that the embodiment of the invention provides, said reflective optical system is Micro Electro Mechanical System MEMS, and it can control the reflector different rotation angle, and then the test light reflection is got into the different fibers branch road.Said detector is an optical time domain reflectometer, can send and receive detection signal, and carry out quantitative analysis, knows the light path characteristic of institute's measuring fiber.
Be example with 1:32 two-stage splitting network below; Fig. 2 is the logical construction sketch map of 1:32 two-stage splitting network fiber optic detection system embodiment provided by the invention; As shown in Figure 2; This fiber optic detection system comprises OLT and 32 ONU (all not illustrating), and the first order optical splitter of a 1:4 and the second level optical splitter (all not illustrating) of 4 1:8 are arranged between OLT and the ONU, on 4 between first order optical splitter and four second level optical splitters optical fiber, 4 band pass filters 3 is set respectively; Its corresponding transmittance wavelength has nothing in common with each other, and is respectively λ
1, λ
2, λ
3, λ
4
Between the output of second level optical splitter and ONU, be inserted with a light path choice device 1; OLT is connected with light path choice device 1 with second level optical splitter through first order optical splitter; Form 32 trunk light paths of present embodiment; The light path choice device is 32 branch's light paths of present embodiment to the formed light path of each ONU.Optical detection system also comprises the detector 2 that is connected with light path choice device 1; Be used for sending test light to said light path choice device; And according to the test light acquisition trunk light path that reflects and the characteristic of branch's light path, the characteristic of trunk light path and branch's light path can comprise characteristics such as welding, bending, flexible jumper, mechanical fixation joint, fracture.
Light path choice device 1 is used for the said test light that receives is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path fire back, and the test light that reflects is sent to said detector 2, said light path choice device 1 can only be selected a light path at every turn.
The method embodiment that carries out the optical fiber detection based on above-mentioned each system provided by the invention comprises and detects trunk light path and branch's light path.
Testing process to the trunk light path comprises: detector sends test light; Test light outputs in the trunk light path to be detected through the light path choice device, and the band pass filter through optical splitters at different levels arrive in the process of OLT and after arriving OLT constantly former road return; The test light that said light path choice device returns said trunk light path to be detected sends to said detector, analyzes the characteristic of the optic path of said trunk light path to be detected through said detector.
Testing process to branch's light path comprises: detector sends test light, and test light outputs in branch's light path to be detected through the light path choice device, and constantly former road is returned in the process that arrives ONU and after arriving ONU; The test light that said light path choice device returns said branch's light path to be detected sends to said detector, analyzes the characteristic of the optic path of said branch's light path to be detected through said detector.
In the two-stage splitting network of the 1:32 of Fig. 2, be example through the 4th port of first order optical splitter, the trunk light path that the 7th port of second level optical splitter is connected with the light path choice device successively to detect from OLT.Fig. 3 is the detection trunk light path sketch map of optical fiber detecting method embodiment provided by the invention, and is as shown in Figure 3, and at first, the control detection device is to the central optical fiber input test light of 2-D optical fibre array 7, and test light comprises λ at least
1, λ
2, λ
3, λ
4The intersection of light, scioptics array 1 makes the central point of test light normal sheaf first convex lens 2, test light is passed optical filter 3 successively with same direction; Above-mentioned optical filter 3 can reflect the professional light more than 90%, can the whole test light of transmission, pass second convex lens 4 and the 3rd convex lens 5 then; Arrival is placed on the reflective optical system 6 of the 3rd convex lens 5 focal planes, and above-mentioned focal plane is meant and is positioned at the plane of along perpendicular to primary optical axis, the adjustable angle of reflective optical system 6; Reflex to the 3rd convex lens 5 according to certain angle, through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4; Through second convex lens 4, test light converges at the optical filter 3 that is placed on the focal plane, does not change direction and passes optical filter directive first convex lens 2; Through first convex lens 2, be parallel to primary optical axis and inject the trunk light path that is connected with second level optical splitter the 7th port, through second level optical splitter, first order optical splitter; Pass to OLT, realize the selection of trunk light path.Band pass filter through optical splitters at different levels arrives OLT, and test light has the light that constantly reflects in the optic path process, return the light path choice device according to the direction opposite with incident.
Then, the light path choice device receives the test light that trunk light path to be detected reflects, and sends to detector, for detector trunk light path characteristic to be detected is analyzed.
At last, detector receiving light path choice device sends the detection signal of returning, the intensity that reflects according to test light and time of advent etc. information, the quantitative optic path characteristic that analyzes the trunk light path, length for example, information such as fault point.
When detecting fiber failure,, know that light path passes through the port numbering of first order optical splitter through the band pass filter of the different wave length that on optical fiber, is provided with.Thereby navigate to fault optical fiber, carry out troubleshooting.
The angle of the reflective optical system 6 through regulating the light path choice device; Test light is reflexed in the different trunk light paths; Method therefor with detect from OLT identically through the 4th port of first order optical splitter, trunk light path that the 7th port of second level optical splitter is connected with the light path choice device successively, repeat no more at this.
When detecting ONU to the branch light path of light path choice device, the ONU3 that connects with second level optical splitter the 3rd port is an example to branch's light path of light path choice device, and Fig. 4 is the detection branches light path sketch map of optical fiber detecting method embodiment provided by the invention; As shown in Figure 4, at first, the control detection device is to the central optical fiber input test light of 2-D optical fibre array 7; Scioptics array 1 makes the central point of test light normal sheaf first convex lens 2, and test light is passed optical filter 3 successively with same direction, and above-mentioned optical filter 3 can reflect the professional light more than 90%; Can the whole test light of transmission, pass second convex lens 4 and the 3rd convex lens 5 then, arrive the reflective optical system 6 that is placed on the 3rd convex lens 5 focal planes; Above-mentioned focal plane is meant and is positioned at the plane of along perpendicular to primary optical axis that the adjustable angle of reflective optical system 6 reflexes to the 3rd convex lens 5 according to certain angle; Through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4, through second convex lens 4; Test light converges at the optical filter 3 that is placed on the focal plane; Do not change direction and pass optical filter directive first convex lens 2,, be parallel to primary optical axis and inject in the branch's light path that is connected with ONU3 through first convex lens 2; Pass to ONU3; Realize branch's light path selection, test light has the light that constantly reflects in the optic path process, return the light path choice device according to the direction opposite with incident.
Then, the light path choice device receives the test light that branch's light path to be detected reflects, and sends to detector, for detector branch's light path characteristic to be detected is analyzed.
At last, detector receiving light path choice device sends the detection signal of returning, the intensity that reflects according to test light and time of advent etc. information, the quantitative transmission characteristic that analyzes optical fiber, length for example, information such as fault point.
The angle of the reflective optical system 6 through regulating the light path choice device reflexes to test light in the different branches light path, and method therefor is identical to branch's light path of light path choice device with the ONU3 that detects second level optical splitter the 3rd port connection, repeats no more at this.
Above-mentioned each the method embodiment of the present invention not only is applied to the secondary splitting network, and for one or more levels splitting network, method therefor those skilled in the art can be known under the situation of not paying creative work, repeat no more at this.
Used system is the system of above-mentioned fiber optic detection system embodiment among above-mentioned each the method embodiment of the present invention, repeats no more at this.
The setting of band pass filter also can only be provided with the band pass filter of different transmission peak wavelengths, used detection method such as the above-mentioned method embodiment of each side according to detection range on above-mentioned each the system's trunk light path of the present invention on the light path that needs detect.
Fig. 5 is the transmission sketch map of the professional light of optical fiber detecting method embodiment provided by the invention; As shown in Figure 5, local side OLT sends through the fiber array 7 of trunk optic path to the light path choice device, at lens arra 1, first convex lens 2 through correspondence professional light from the center; Converge at optical filter 3, optical filter reflexes to first convex lens 2 with the professional light more than 90%, passes through lens arra 1, fiber array 7 again; Be transferred in the corresponding branch optical fiber; Arrive optical network unit ONU, realize the professional optical transmission of OLT, when ONU has professional light signal to be sent to OLT to the ONU direction;, do not giving unnecessary details according to transmitting to the opposite direction of ONU with identical principle with OLT here.Because optical filter can be with the professional light reflection more than 90%, the test light that transmission is whole, therefore, when optical fiber detected, test light can not influence the normal transmission of professional light, and it is impacted.
Above-mentioned each embodiment of the present invention; Also can be applicable in the system of multicenter local side; The system with a central office is not restriction, and Fig. 6 is the logical construction sketch map of the two-stage splitting network system embodiment of a plurality of central offices provided by the invention, and is as shown in Figure 6; Used detection method repeats no more at this with above-mentioned each embodiment.
The method that the optical fiber that the embodiment of the invention provides detects; The light path choice device is inserted between afterbody optical splitter and the ONU; Branch's Characteristics Detection with the EPON of putting multiple spot has changed the detection of point-to-point into, and only need are provided with the band pass filter with different transmission peak wavelengths between the input of output to the afterbody optical splitter of first order optical splitter; Reduce difficulty of construction to a certain extent, reduced difficulty of test.
The optical fiber detector that the embodiment of the invention provides is applicable to and detects a fibre system that fibre system comprises optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber, is provided with one-level optical splitter at least between OLT and the ONU; On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that first band pass filter is connected, the transmission peak wavelength sum that each second band pass filter is corresponding is the transmission peak wavelength of first band pass filter; The rest may be inferred.
Optical fiber detector comprises interconnective light path choice device and detector; Wherein, the light path choice device is arranged between the output and ONU of afterbody optical splitter in the fibre system, form OLT and pass through the trunk light path of optical splitter to the light path choice device of one-level at least, and ONU is to branch's light path of light path choice device.
Detector is used for sending test light to the light path choice device, and control light path choice device selection trunk light path to be detected, obtains the characteristic of trunk light path according to the test light that reflects; And control light path choice device selection branch's light path to be detected, according to the characteristic of the test light acquisition branch light path that reflects; Test light comprises the transmission peak wavelength of all band pass filters at least.
The light path choice device is used for the test light that detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to detector.
Optical fiber detector in the present embodiment; The fibre system structure that is applicable to detection is identical with system embodiment, repeats no more here, and the optical fiber detector in the present embodiment can be carried out the technical scheme of above-mentioned each method embodiment; Its realization principle and technique effect are similar, repeat no more here.
As stated among the optical fiber detector embodiment; The light path choice device comprises second convex lens and the 3rd convex lens that the lens arra that is connected with each optical fiber that sets gradually, sphere are oppositely arranged towards first convex lens, optical filter, the sphere of lens arra, and the reflective optical system that is used to regulate the light reflection angle.The structure of light path choice device is identical with system embodiment, repeats no more here, and the light path choice device in the present embodiment can be carried out the technical scheme of above-mentioned each method embodiment, and its realization principle and technique effect are similar, repeat no more here.
As stated among the optical fiber detector embodiment, band pass filter is the chirp grating of windowing or the filter plate of plated film; Reflective optical system is a Micro Electro Mechanical System, and detector is an optical time domain reflectometer.The technical scheme of carrying out above-mentioned each method embodiment of band pass filter, reflective optical system and detector, its realization principle and technique effect are similar, repeat no more here.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each method embodiment can be accomplished through the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program the step that comprises above-mentioned each method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (9)
1. a fiber optic detection system is characterized in that, comprising:
Optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber are provided with one-level optical splitter at least between said OLT and the said ONU;
On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that said first band pass filter is connected, the corresponding transmission peak wavelength sum of said each second band pass filter is the transmission peak wavelength of said first band pass filter; The rest may be inferred;
In the end be inserted with a light path choice device between the output of one-level optical splitter and the said ONU; Form the trunk light path of said OLT, and said ONU is to branch's light path of said light path choice device through optical splitter to the said light path choice device of said one-level at least;
Also comprise the detector that is connected with said light path choice device, be used for sending test light, and control said light path choice device and select trunk light path to be detected, obtain the characteristic of trunk light path according to the test light that reflects to said light path choice device; And control said light path choice device and select branch's light path to be detected, obtain the characteristic of branch's light path according to the test light that reflects; Said test light comprises the transmission peak wavelength of all band pass filters at least;
Said light path choice device is used for the test light that said detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to said detector.
2. system according to claim 1; It is characterized in that; Said light path choice device comprises second convex lens and the 3rd convex lens that the lens arra that is connected with each said optical fiber that sets gradually, sphere are oppositely arranged towards first convex lens, optical filter, the sphere of said lens arra, and the reflective optical system that is used to regulate the light reflection angle.
3. system according to claim 1 and 2 is characterized in that, said band pass filter is the chirp grating of windowing or the filter plate of plated film.
4. system according to claim 1 and 2 is characterized in that, said reflective optical system is a Micro Electro Mechanical System, and said detector is an optical time domain reflectometer.
5. one kind based on carry out the method that optical fiber detects like the arbitrary said system of claim 1 to 4, it is characterized in that, comprising:
Testing process to the trunk light path comprises: said detector sends test light; Test light outputs in the trunk light path to be detected through said light path choice device, and the band pass filter through optical splitters at different levels arrive in the process of OLT and after arriving OLT constantly former road return; The test light that said light path choice device returns said trunk light path to be detected sends to said detector, analyzes the characteristic of the optic path of said trunk light path to be detected through said detector;
Testing process to branch's light path comprises: said detector sends test light, and test light outputs in branch's light path to be detected through said light path choice device, and constantly former road is returned in the process that arrives ONU and after arriving ONU; The test light that said light path choice device returns said branch's light path to be detected sends to said detector, analyzes the characteristic of the optic path of said branch's light path to be detected through said detector.
6. optical fiber detector; It is characterized in that; Be applicable to and detect a fibre system, said fibre system comprises optical line terminal OLT and a plurality of optical network unit ONU of the central office that connects through optical fiber, is provided with one-level optical splitter at least between said OLT and the said ONU; On each optical fiber of the input of output to the afterbody optical splitter of first order optical splitter, the band pass filter with different transmission peak wavelengths is set respectively; Wherein, Be serially connected with one first band pass filter on each branch optical fiber of the output of first order optical splitter; Be serially connected with one second band pass filter on each branch optical fiber of the output of several subordinate's optical splitters that said first band pass filter is connected, the corresponding transmission peak wavelength sum of said each second band pass filter is the transmission peak wavelength of said first band pass filter; The rest may be inferred;
Said optical fiber detector comprises interconnective light path choice device and detector; Wherein, Said light path choice device is arranged between the output and said ONU of afterbody optical splitter in the said fibre system; Form the trunk light path of said OLT, and said ONU is to branch's light path of said light path choice device through optical splitter to the said light path choice device of said one-level at least;
Said detector is used for sending test light to said light path choice device, and controls said light path choice device and select trunk light path to be detected, obtains the characteristic of trunk light path according to the test light that reflects; And control said light path choice device and select branch's light path to be detected, obtain the characteristic of branch's light path according to the test light that reflects; Said test light comprises the transmission peak wavelength of all band pass filters at least;
Said light path choice device is used for the test light that said detector sends is outputed to each trunk light path to be detected or branch's light path; And receive the test light that trunk light path or branch's light path reflect, and the test light that reflects is sent to said detector.
7. optical fiber detector according to claim 6; It is characterized in that; Said light path choice device comprises second convex lens and the 3rd convex lens that the lens arra that is connected with each said optical fiber that sets gradually, sphere are oppositely arranged towards first convex lens, optical filter, the sphere of said lens arra, and the reflective optical system that is used to regulate the light reflection angle.
8. according to claim 6 or 7 described optical fiber detectors, it is characterized in that said band pass filter is the chirp grating of windowing or the filter plate of plated film.
9. according to claim 6 or 7 described optical fiber detectors, it is characterized in that said reflective optical system is a Micro Electro Mechanical System, said detector is an optical time domain reflectometer.
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