Summary of the invention
The embodiment of the present invention provides a kind of fiber optic detection system on the one hand, comprising:
By optical line terminal OLT and multiple optical network unit ONU of the central office of Fiber connection, between described OLT and described ONU, be provided with at least one grade of optical splitter;
At the output of first order optical splitter on each optical fiber of the input of afterbody optical splitter, the band pass filter with different transmission peak wavelength is set respectively; Wherein, each branch optical fiber of the output of first order optical splitter is serially connected with one first band pass filter, each branch optical fiber of the output of several subordinates optical splitter that described first band pass filter connects is serially connected with one second band pass filter, and the transmission peak wavelength sum that described each second band pass filter is corresponding is the transmission peak wavelength of described first band pass filter; The rest may be inferred;
In the end be inserted with an optical routing device between the output of one-level optical splitter and described ONU, form described OLT by the optical splitter of described at least one-level to the backbone optical path of described optical routing device, and described ONU is to branch's light path of described optical routing device;
Also comprise a detector be connected with described optical routing device, for sending test light to described optical routing device, and control described optical routing device and select backbone optical path to be detected, obtain the characteristic of backbone optical path according to the test light reflected; And control described optical routing device and select branch's light path to be detected, the characteristic of branch's light path is obtained according to the test light reflected; Described test light at least comprises the transmission peak wavelength of all band pass filters;
Described optical routing device is used for the test light that described detector sends to output in each backbone optical path to be detected or branch's light path; And receive the test light that backbone optical path or branch's light path reflect, and the test light reflected is sent to described detector.
The embodiment of the present invention provides a kind of method of carrying out fiber laser arrays based on said system on the other hand, comprising:
The testing process of backbone optical path is comprised: described detector sends test light, test light is outputted in backbone optical path to be detected by described optical routing device, and in the process being arrived OLT by the band pass filter of optical splitter at different levels and after arriving OLT constantly former road return; The test light that described backbone optical path to be detected returns is sent to described detector by described optical routing device, is analyzed the characteristic of the optic path of described backbone optical path to be detected by described detector;
Comprise the testing process of branch's light path: described detector sends test light, test light is outputted in branch's light path to be detected by described optical routing device, and in the process arriving ONU and to arrive after ONU constantly former road and return; The test light that described branch's light path to be detected returns is sent to described detector by described optical routing device, is analyzed the characteristic of the optic path of described branch's light path to be detected by described detector.
The embodiment of the present invention provides a kind of optical fiber detector more on the one hand, be applicable to detection one fibre system, described fibre system comprises optical line terminal OLT by the central office of Fiber connection and multiple optical network unit ONU, is provided with at least one grade of optical splitter between described OLT and described ONU; At the output of first order optical splitter on each optical fiber of the input of afterbody optical splitter, the band pass filter with different transmission peak wavelength is set respectively; Wherein, each branch optical fiber of the output of first order optical splitter is serially connected with one first band pass filter, each branch optical fiber of the output of several subordinates optical splitter that described first band pass filter connects is serially connected with one second band pass filter, and the transmission peak wavelength sum that described each second band pass filter is corresponding is the transmission peak wavelength of described first band pass filter; The rest may be inferred;
Described optical fiber detector comprises interconnective optical routing device and detector; Wherein, described optical routing device is arranged between the output of afterbody optical splitter in described fibre system and described ONU, form described OLT by the optical splitter of described at least one-level to the backbone optical path of described optical routing device, and described ONU is to branch's light path of described optical routing device;
Described detector is used for sending test light to described optical routing device, and controls described optical routing device and select backbone optical path to be detected, obtains the characteristic of backbone optical path according to the test light reflected; And control described optical routing device and select branch's light path to be detected, the characteristic of branch's light path is obtained according to the test light reflected; Described test light at least comprises the transmission peak wavelength of all band pass filters;
Described optical routing device is used for the test light that described detector sends to output in each backbone optical path to be detected or branch's light path; And receive the test light that backbone optical path or branch's light path reflect, and the test light reflected is sent to described detector.
The fiber optic detection system that the embodiment of the present invention provides, optical fiber detector and method thereof, by in the end one-level optical splitter and insert an optical routing device between ONU, form the backbone optical path of optical routing device to OLT, and optical routing device is to branch's light path of ONU; Also having a detector to be connected with this optical routing device, for sending test light, and obtaining the characteristic of each light path according to the test light reflected; Position due to optical routing device is inserted between afterbody optical splitter and ONU, point-to-multipoint PON branching characteristics is tested, change the branching characteristics test of point-to-point into, thus, do not need in each branch light path, arrange the band pass filter with different transmission peak wavelength, reduce difficulty of construction to a certain extent.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The fiber optic detection system that the embodiment of the present invention provides comprises:
By optical line terminal OLT and multiple optical network unit ONU of the central office of Fiber connection, between described OLT and described ONU, be provided with at least one grade of optical splitter;
Time in the fibre circuit of connection OLT and ONU merely through an optical splitter, this optical-fiber network is one-level splitting network.
Through two optical splitters in the fibre circuit of connection OLT and ONU, this optical-fiber network is two-stage splitting network.From OLT to ONU, first optical splitter of process is first order optical splitter, and second optical splitter of process is second level optical splitter.
Through three and above optical splitter in the fibre circuit of connection OLT and ONU, this optical-fiber network is multistage splitting network, from OLT to ONU, first optical splitter of process is first order optical splitter successively, second optical splitter of process is second level optical splitter, the like, N number of optical splitter of process is N level optical splitter.
From OLT to ONU, successively through optical splitter in after through optical splitter be previous subordinate's optical splitter, if second level optical splitter is subordinate's optical splitter of first order optical splitter.
At the output of first order optical splitter on each optical fiber of the input of afterbody optical splitter, the band pass filter with different transmission peak wavelength is set respectively; Wherein, each branch optical fiber of the output of first order optical splitter is serially connected with one first band pass filter, each branch optical fiber of the output of several subordinates optical splitter that described first band pass filter connects is serially connected with one second band pass filter, and the transmission peak wavelength sum that described each second band pass filter is corresponding is the transmission peak wavelength of described first band pass filter; The rest may be inferred;
As in one-level splitting network, do not need to arrange band pass filter.
In two-stage light splitting networking, first order optical splitter as 1:32 is the light splitting ratio of 1:4, second level optical splitter is the light splitting ratio of 1:8, then on 4 optical fiber of first order optical splitter output, arrange the band pass filter of 4 different wave lengths, as wavelength is respectively λ1, λ2, λ3, λ4.
In three grades of splitting networks, first order optical splitter as 1:128 is the light splitting ratio of 1:4, second level optical splitter is the light splitting ratio of 1:4, third level optical splitter is the light splitting ratio of 1:8, on 4 branch optical fibers of first order optical splitter output, be then connected in series 4 different the first band pass filters respectively, transmission peak wavelength is respectively λ1, λ2, λ3, λ4; 4 optical fiber of first the optical splitter output in the second level arrange the second band pass filter of 4 different wave lengths, as wavelength is respectively λ11, λ12, λ13, λ14; 4 optical fiber of second the optical splitter output in the second level arrange the band pass filter of 4 different wave lengths, as wavelength is respectively λ21, λ22, λ23, λ24; 4 optical fiber of the 3rd the optical splitter output in the second level arrange the band pass filter of 4 different wave lengths, as wavelength is respectively λ31, λ32, λ33, λ34; 4 optical fiber of the 4th the optical splitter output in the second level arrange the band pass filter of 4 different wave lengths, as wavelength is respectively λ41, λ42, λ43, λ44, wherein in the first band pass filter, λ1=λ11+ λ12+ λ13+ λ14; λ2=λ21+ λ22+ λ23+ λ24; λ3=λ31+ λ32+ λ33+ λ34; λ4=λ41+ λ42+ λ43+ λ44.In 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 an optical routing device between the output of one-level optical splitter and described ONU, form described OLT by the optical splitter of described at least one-level to the backbone optical path of described optical routing device, and described ONU is to branch's light path of described optical routing device; Described optical routing device can only select a light path at every turn.Also comprise a detector be connected with described optical routing device, for sending test light to described optical routing device, and control described optical routing device and select backbone optical path to be detected, obtain the characteristic of backbone optical path according to the test light reflected; And control described optical routing device and select branch's light path to be detected, the characteristic of branch's light path is obtained according to the test light reflected; Described test light at least comprises the transmission peak wavelength of all different band bandpass filters; As being 1:4 in the above-mentioned 1:32(first order, the second level is 1:8) two-stage splitting network in, it is λ that used test light at least comprises wavelength1, λ2, λ3, λ4the intersection of light, as in three grades of splitting networks of above-mentioned 1:128, it is λ that used test light at least comprises wavelength1, λ2, λ3, λ4; Wherein λ1=λ11+ λ12+ λ13+ λ14; λ2=λ21+ λ22+ λ23+ λ24; λ3=λ31+ λ32+ λ33+ λ34; λ4=λ41+ λ42+ λ43+ λ44the intersection of light.
Described optical routing device is used for the test light that described detector sends to output in each backbone optical path to be detected or branch's light path; And receive the test light that backbone optical path or branch's light path reflect, and the test light reflected is sent to described detector.Detector, by the information such as intensity, distance of light reflected, knows the light path characteristic of each backbone optical path and branch's light path.
The fiber optic detection system that the embodiment of the present invention provides, is inserted in optical routing device between the afterbody optical splitter of splitting network and ONU, is tested by point-to-multipoint PON branching characteristics, has changed the test of point-to-point into; By at the output at first order optical splitter on each optical fiber of the input of afterbody optical splitter, the band pass filter with different transmission peak wavelength is set respectively, for obtaining the port numbers of each corresponding optical splitter, be convenient to the identification of fault optical fiber with carry out maintenance work.Detector by sending test light in described optical routing device, reflect it in corresponding backbone optical path and branch's light path, and the test light that the backbone optical path received or branch's light path reflect is reflexed in optical routing device, and sending to detector, detector analyzes corresponding backbone optical path or the characteristic of branch's light path.The fiber optic detection system of the embodiment of the present invention does not need branch's light path of being connected with ONU at optical routing device arranges band pass filter, reduces difficulty of construction to a certain extent.
Fig. 1 is the optical routing 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, optical routing device comprise that set gradually with lens arra 1 that is each Fiber connection, the second convex lens 4 of being oppositely arranged towards the first convex lens 2 of lens arra, optical filter 3, sphere of sphere and the 3rd convex lens 5, and for regulating the reflective optical system 6 of light reflection angle.Above-mentioned optical filter 3 can reflect the business light of more than 90%, can the whole test light of transmission, and therefore, in the process of fiber laser arrays, test light can not impact the normal transmission of business light.
Above-mentioned each device central point of optical routing device is coaxial, photodetector is to the central optical fiber input test light (being positioned on central axis) of 2-D optical fibre array 7, scioptics array 1 makes the central point of test light normal sheaf first convex lens 2, test light passes optical filter 3 successively with same direction, above-mentioned optical filter 3 can reflect the business light of more than 90%, can the whole test light of transmission, then through the second convex lens 4 and the 3rd convex lens 5, arrive the reflective optical system 6 being placed on the 3rd convex lens 5 focal plane, above-mentioned focal plane refers to and is positioned at the plane of focus place perpendicular to primary optical axis, the adjustable angle of reflective optical system 6, according to different angle reflections to the 3rd convex lens 5, through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4, through the second convex lens 4, test light converges at the optical filter 3 being placed on focal plane, do not change direction through optical filter directive first convex lens 2, through the first convex lens 2, be parallel to primary optical axis directive branch's light path or backbone optical path, realize light path to select.The test light input photodetector that test light reflects on tested optic path process Zhong Youyuan road.
In the fiber optic detection system that the embodiment of the present invention provides, described band pass filter can be the filter plate of the chirp grating of windowing or plated film, and its operation principle is the light of transmission specific wavelength.
In the fiber optic detection system that the embodiment of the present invention provides, described reflective optical system is Micro Electro Mechanical System MEMS, and it can control reflector different rotation angle, and then test light reflection is entered different optical fiber branch roads.Described detector is optical time domain reflectometer, can send and receive detection signal, and carries out quantitative analysis, knows the light path characteristic of institute's measuring fiber.
Below for 1:32 two-stage splitting network, Fig. 2 is the logical construction schematic diagram 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(and does not all illustrate), the first order optical splitter of a 1:4 and the second level optical splitter (all not illustrating) of 4 1:8 is had between OLT and ONU, 4 between first order optical splitter and four second level optical splitters optical fiber arrange 4 band pass filters 3 respectively, the Transmission light wavelength of its correspondence is different, is respectively λ1, λ2, λ3, λ4.
An optical routing device 1 is inserted with between the output and ONU of second level optical splitter, OLT is connected with optical routing device 1 with second level optical splitter by first order optical splitter, form 32 backbone optical paths of the present embodiment, the light path that optical routing device is formed to each ONU is 32 branch's light paths of the present embodiment.Optical detection system also comprises a detector 2 be connected with optical routing device 1, for sending test light to described optical routing device, and the characteristic of backbone optical path and branch's light path is obtained according to the test light reflected, the characteristic of backbone optical path and branch's light path can comprise the characteristics such as welding, bending, flexible jumper, mechanical pinning contact, fracture.
Optical routing device 1 is for outputting in each backbone optical path to be detected or branch's light path by the described test light received; And receive the test light that backbone optical path or branch's light path fire back, and the test light reflected is sent to described detector 2, described optical routing device 1 can only select a light path at every turn.
Embodiment of the method for carrying out fiber laser arrays based on above-mentioned each system provided by the invention, comprises and detects backbone optical path and branch's light path.
The testing process of backbone optical path is comprised: detector sends test light, test light is outputted in backbone optical path to be detected by optical routing device, and in the process being arrived OLT by the band pass filter of optical splitter at different levels and after arriving OLT constantly former road return; The test light that described backbone optical path to be detected returns is sent to described detector by described optical routing device, is analyzed the characteristic of the optic path of described backbone optical path to be detected by described detector.
Comprise the testing process of branch's light path: detector sends test light, test light is outputted in branch's light path to be detected by optical routing device, and in the process arriving ONU and to arrive after ONU constantly former road and return; The test light that described branch's light path to be detected returns is sent to described detector by described optical routing device, is analyzed the characteristic of the optic path of described branch's light path to be detected by described detector.
In the two-stage splitting network of the 1:32 of Fig. 2, to detect from OLT successively through the 4th port of first order optical splitter, the 7th backbone optical path that port is connected with optical routing device of second level optical splitter.Fig. 3 is the detection backbone optical path schematic diagram of optical fiber detecting method embodiment provided by the invention, and as shown in Figure 3, first, control the central optical fiber input test light of detector to 2-D optical fibre array 7, test light at least comprises λ1, λ2, λ3, λ4the intersection of light, scioptics array 1 makes the central point of test light normal sheaf first convex lens 2, test light passes optical filter 3 successively with same direction, above-mentioned optical filter 3 can reflect the business light of more than 90%, can the whole test light of transmission, then through the second convex lens 4 and the 3rd convex lens 5, arrive the reflective optical system 6 being placed on the 3rd convex lens 5 focal plane, above-mentioned focal plane refers to and is positioned at the plane of focus place perpendicular to primary optical axis, the adjustable angle of reflective optical system 6, the 3rd convex lens 5 are reflexed to according to certain angle, through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4, through the second convex lens 4, test light converges at the optical filter 3 being placed on focal plane, do not change direction through optical filter directive first convex lens 2, through the first convex lens 2, be parallel to primary optical axis and inject the backbone optical path be connected with second level optical splitter the 7th port, by second level optical splitter, first order optical splitter, pass to OLT, realize backbone optical path to select.Arrive OLT by the band pass filter of optical splitter at different levels, test light has the light constantly reflected in optic path process, according to the direction return light path choice device contrary with incidence.
Then, optical routing device receives the test light that backbone optical path to be detected reflects, and sends to detector, analyzes backbone optical path characteristic to be detected for detector.
Finally, detector receiving light path choice device sends the detection signal of returning, the information such as the intensity reflected according to test light and the time of advent, the quantitative optic path characteristic analyzing backbone optical path, such as length, the information such as fault point.
When detecting fiber failure, by the band pass filter of different wave length arranged on optical fiber, know the port numbering of light path by first order optical splitter.Thus navigate to fault optical fiber, carry out troubleshooting.
By regulating the angle of the reflective optical system 6 of optical routing device, test light is reflexed in different backbone optical paths, method therefor with detect from 7th backbone optical path that port with optical routing device be connected of OLT successively through the 4th port of first order optical splitter, second level optical splitter identical, do not repeat them here.
When detecting ONU to branch's light path of optical routing device, the ONU3 connected for second level optical splitter the 3rd port is to branch's light path of optical routing device, Fig. 4 is the detection branches light path schematic diagram of optical fiber detecting method embodiment provided by the invention, as shown in Figure 4, first, control the central optical fiber input test light of detector to 2-D optical fibre array 7, scioptics array 1 makes the central point of test light normal sheaf first convex lens 2, test light passes optical filter 3 successively with same direction, above-mentioned optical filter 3 can reflect the business light of more than 90%, can the whole test light of transmission, then through the second convex lens 4 and the 3rd convex lens 5, arrive the reflective optical system 6 being placed on the 3rd convex lens 5 focal plane, above-mentioned focal plane refers to and is positioned at the plane of focus place perpendicular to primary optical axis, the adjustable angle of reflective optical system 6, the 3rd convex lens 5 are reflexed to according to certain angle, through the 3rd convex lens 5, test light is parallel to primary optical axis directive second convex lens 4, through the second convex lens 4, test light converges at the optical filter 3 being placed on focal plane, do not change direction through optical filter directive first convex lens 2, through the first convex lens 2, being parallel to primary optical axis injects in the branch's light path be connected with ONU3, pass to ONU3, realize branch's light path to select, test light has the light constantly reflected in optic path process, according to the direction return light path choice device contrary with incidence.
Then, optical routing device receives the test light that branch's light path to be detected reflects, and sends to detector, analyzes branch's light path characteristic to be detected for detector.
Finally, detector receiving light path choice device sends the detection signal of returning, the information such as the intensity reflected according to test light and the time of advent, the quantitative transmission characteristic analyzing optical fiber, such as length, the information such as fault point.
By regulating the angle of the reflective optical system 6 of optical routing device, test light reflexed in different branch's light paths, the ONU3 that method therefor connects with detection second level optical splitter the 3rd port is identical to branch's light path of optical routing device, does not repeat them here.
The above-mentioned each embodiment of the method for the present invention is not only applied to secondary light-splitting network, and for one or more levels splitting network, method therefor those skilled in the art can be known when not paying creative work, do not repeat them here.
In the above-mentioned each embodiment of the method for the present invention, system used is the system of above-mentioned fiber optic detection system embodiment, does not repeat them here.
On the above-mentioned each system backbone optical path of the present invention, the setting of band pass filter also can according to detection range, and only needing the band pass filter light path detected being arranged different transmission peak wavelength, detection method used is as above-mentioned each side method embodiment.
Fig. 5 is the transmission schematic diagram of the business light of optical fiber detecting method embodiment provided by the invention, as shown in Figure 5, business Guang Cong center local side OLT sends the fiber array 7 being transferred to optical routing device through backbone optical path, at the lens arra 1 through correspondence, first convex lens 2, converge at optical filter 3, the business light of more than 90% is reflexed to the first convex lens 2 by optical filter, again through lens arra 1, fiber array 7, be transferred in corresponding branch optical fiber, arrive optical network unit ONU, realize the business optical transport in OLT to ONU direction, when ONU has business light signal to be sent to OLT, transmit according to the direction contrary with OLT to ONU with identical principle, do not repeating herein.Because the business light of more than 90% can reflect by optical filter, the test light that transmission is whole, therefore, when fiber laser arrays, test light can not affect the normal transmission of business light, impacts it.
The various embodiments described above of the present invention, also can be applicable in the system of multicenter local side, not with the system of a central office for restriction, Fig. 6 is the logical construction schematic diagram of the two-stage splitting network system embodiment of multiple central office provided by the invention, as shown in Figure 6, the same the various embodiments described above of detection method used, do not repeat them here.
The method of the fiber laser arrays that the embodiment of the present invention provides, optical routing device is inserted between afterbody optical splitter and ONU, the branching characteristics of point-to-multipoint EPON is detected, change the detection of point-to-point into, only need the band pass filter with different transmission peak wavelength be set between the input of the output of first order optical splitter to afterbody optical splitter, reduce difficulty of construction to a certain extent, reduce difficulty of test.
The optical fiber detector that the embodiment of the present invention provides, is applicable to detection one fibre system, and fibre system comprises optical line terminal OLT by the central office of Fiber connection and multiple optical network unit ONU, is provided with at least one grade of optical splitter between OLT and ONU; At the output of first order optical splitter on each optical fiber of the input of afterbody optical splitter, the band pass filter with different transmission peak wavelength is set respectively; Wherein, each branch optical fiber of the output of first order optical splitter is serially connected with one first band pass filter, each branch optical fiber of the output of several subordinates optical splitter that the first band pass filter connects is serially connected with one second band pass filter, and the transmission peak wavelength sum that each second band pass filter is corresponding is the transmission peak wavelength of the first band pass filter; The rest may be inferred.
Optical fiber detector comprises interconnective optical routing device and detector; Wherein, between the output that optical routing device is arranged on afterbody optical splitter in fibre system and ONU, form the backbone optical path of optical splitter to optical routing device that OLT passes through at least one-level, and ONU is to branch's light path of optical routing device.
Detector is used for sending test light to optical routing device, and controls optical routing device and select backbone optical path to be detected, obtains the characteristic of backbone optical path according to the test light reflected; And control optical routing device selects branch's light path to be detected, obtains the characteristic of branch's light path according to the test light reflected; Test light at least comprises the transmission peak wavelength of all band pass filters.
The test light that optical routing device is used for detector sends outputs in each backbone optical path to be detected or branch's light path; And receive the test light that backbone optical path or branch's light path reflect, and the test light reflected is sent to detector.
Optical fiber detector in the present embodiment, the fibre system structure being applicable to detect is identical with system embodiment, and repeat no more, the optical fiber detector in the present embodiment can perform the technical scheme of above-mentioned each embodiment of the method herein, it realizes principle and technique effect is similar, repeats no more herein.
In optical fiber detector embodiment described above, optical routing device comprise that set gradually with lens arra that is each Fiber connection, the second convex lens of being oppositely arranged towards the first convex lens of lens arra, optical filter, sphere of sphere and the 3rd convex lens, and for regulating the reflective optical system of light reflection angle.The structure of optical routing device is identical with system embodiment, repeats no more herein, and the optical routing device in the present embodiment can perform the technical scheme of above-mentioned each embodiment of the method, and it realizes principle and technique effect is similar, repeats no more herein.
In optical fiber detector embodiment described above, band pass filter is the filter plate of chirp grating or the plated film of windowing; Reflective optical system is Micro Electro Mechanical System, and detector is optical time domain reflectometer.The technical scheme performing above-mentioned each embodiment of the method for band pass filter, reflective optical system and detector, it realizes principle and technique effect is similar, repeats no more herein.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.