CN102893539A - Optical network monitoring module, optical communication network and optical network monitoring method - Google Patents
Optical network monitoring module, optical communication network and optical network monitoring method Download PDFInfo
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- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention is suitable for the communication field, and provides an optical network monitoring module, an optical communication network and an optical network monitoring method. The monitoring module comprises a first emitting device used for emitting a downstream light wave, a first receiving device used for receiving a first reflection light of the downstream light wave reflected by the optical network, a second emitting device used for emitting a test light wave having the same wavelength with an upstream light wave, and a second receiving device used for receiving the second reflection light of the upstream light wave and the test light wave reflected by the optical network. According to the invention, by combining the reflection light detection of the downstream light wave and the test light wave, the test capability is improved; the wavelengths of the test light wave and the upstream light wave are same, so that the optical network monitoring module, the optical communication network and the optical network monitoring method are especially suitable for a grid connected environment having a limited dynamic range and a large branch ration, the problem can be solved effectively that the reflection energy is weaker, so that the detection effect is not good, the accurate effective monitoring on the light network of large branch ratio is realized, and the communication business stability is improved.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of optical-fiber network monitoring modular, optical communication system and optical-fiber network monitoring method.
Background technology
Along with the continuous growth of user to bandwidth demand, traditional copper cash broadband access system more and more faces bandwidth bottleneck, meanwhile, the Fibre Optical Communication Technology that bandwidth capacity is huge is increasingly mature, application cost descends year by year, so that Optical Access Network becomes the strong competitor of broadband access network of future generation, wherein especially more competitive with EPON.
The topological structure of typical Optical Access Network is the OLT(Optical Line Terminal that is positioned at central machine room by, optical line terminal) and several be positioned at the ONU(Optical Network Unit of user's side, optical network unit) point-to-multipoint configuration that forms, as the downlink communication carrier, ONU is then take the light of another predetermined wavelength (such as 1310nm) as the uplink communication carrier with the light of predetermined wavelength (such as 1490nm) for OLT.Realize connection by the optical fiber through optical branching device between these two kinds of equipment.
Along with constantly spreading out of network topology, the coverage of optical-fiber network constantly enlarges.Under this large-scale applied environment, in order to guarantee the stability of communication service, the monitoring that fiber optic network is carried out becomes extremely important.How to realize to optical-fiber network carry out low cost and effectively test monitoring become the current focus of attention.
The monitoring means that industry is general is to adopt OTDR (Optical Time Domain Refletometer, optical time domain reflectometer) to come optical-fiber network is carried out fault detect and location.The basic principle of OTDR is that the retroreflection that produces when utilizing light wave to propagate in optical-fiber network detects the fault of optical-fiber network and the position that fault occurs, specifically the light with a certain wavelength incides in the optical-fiber network, then embody the situation of optical-fiber network by the size of measuring corresponding energy of reflection light, different wave length has different reflection characteristics in transmission course.This detection mode is divided into external and built-in two kinds, such as Fig. 1-1, shown in the 1-2, as its name suggests, external and built-in difference is the otherness of the checkout gear that adopts, external mode adopts large-scale independently OTDR equipment to measure monitoring by optical branching device or WDM (wavelength division multiplexing) device access optical-fiber network, and built-in mode to be the device that will detect usefulness be integrated into optical module inside, the realization miniaturization is integrated, although built-in OTDR is more inferior than external on the performance characteristics such as dynamic range, but because it can merge with existing network is perfect, and with respect to external mode, its cost is cheaper, thereby becomes the focus of concern.Built-in OTDR adopts the mode that shares internal components with optical module usually, and tested media generally adopts OLT downlink data wavelength, and this test mode is carried out network monitor by the retroreflection amount of measuring the downlink data wavelength.
The OLT optical module structure that occurs a kind of Integrated Light time-domain reflectomer function in the prior art, as shown in Figure 2, wherein, device F1, F2, F3, F4 are the plated film sheet, F1, F2 play a minute light action, and F3, F4 play buffer action, and the descending light wave of laser emission enters the two-way lightwave path of vertical direction the top and transfers to fiber optic network through F1 and F2, the F2 reflection makes it to be received by the first photodetector from the up light wave of optical-fiber network.Simultaneously, F2 sees through descending light wave and reflected wave thereof, and wherein, reflected wave is reflexed to the second photodetector by F1, carries out the test of fiber optic network situation by detecting this part light energy.
This scheme adds the function that new wavelength division component and receiver (the second photodetector) have been realized OTDR based on existing optical module structure.But this scheme adopts single wavelength (wavelength of descending light wave) to test, because the restriction of Dynamic Range, to the network environment of the large branching ratio (ratio of OLT and ONU) such as 1:32,1:64, the light that back-end network reflects is very faint, can not well realize the monitoring of network condition.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of optical-fiber network monitoring modular, is intended to solve the existing deficiency of built-in formula optical time domain reflectometer on the network monitor ability, to realize the effective monitoring of large branching ratio optical-fiber network.
The embodiment of the invention provides following technical scheme:
First aspect,
A kind of optical-fiber network monitoring modular is provided, comprises:
The first emitter is used for launching descending light wave;
First receiving device is used for receiving the first reverberation that described descending light wave reflects through optical-fiber network;
The second emitter is used for the emission test light wave identical with the wavelength of up light wave;
The second receiving system is used for receiving the second reverberation that up light wave and described test light wave reflect through optical-fiber network.
Concrete, described the first emitter is connected the first optical branching device and connects first wave guide with first receiving device,
Described first wave guide is used for described descending light wave is exported to optical-fiber network, and described the first reverberation is transmitted to first receiving device by the first optical branching device;
Described the second emitter be connected receiving system and connect the second waveguide by the second optical branching device;
Described the second waveguide is used for described test light wave direction optical-fiber network output, and described the second reverberation and up light wave are transmitted to the second receiving system by the second optical branching device.
Further, this optical-fiber network monitoring modular also comprises the 3rd waveguide, be used for carrying out coupled transfer with described first wave guide and the second waveguide, with described descending light wave and the output of test light wave direction optical-fiber network, and described the first reflection optical coupler is bonded to first wave guide, the second reverberation and up light wave are coupled to the second waveguide.
Further, the end of described first wave guide, the second waveguide and the 3rd waveguide is for the pyramidal structure that promotes coupling efficiency.
Preferably, described the first optical branching device is 9:1 to the energy of the descending light wave of described first wave guide output with ratio to the first catoptrical energy of first receiving device output;
Described the second optical branching device is 9:1 to the energy of the up light wave of described the second receiving system output with ratio to the energy of the test light wave of the second waveguide output.
Further, described optical-fiber network monitoring modular also comprises:
Mirror coating is used for the descending light wave of described first wave guide output is reflected or transmission to optical-fiber network, and described the first reverberation is reflected or transmission to first wave guide; And
With the optical-fiber network transmission of test light wave direction or the reflection of described the second waveguide output, and with described up light wave and the second reverberation to the second waveguide transmission or reflection.
Further, described mirror coating and described first wave guide and the second waveguide are structure as a whole.
Perhaps, described optical-fiber network monitoring modular also comprises:
Diffraction grating is used for the descending light wave of described first wave guide output and the test light wave of the second waveguide output are coupled to optical-fiber network, and described the first reverberation is coupled to first wave guide, with the second reverberation and up light wave to the second waveguide-coupled.
Further, described optical-fiber network monitoring modular also comprises:
The 3rd emitter is used for sending with descending light wave the third light wave different with the wavelength of described test light wave;
Described the third light wave is received by described first receiving device or the second receiving system through the 3rd reverberation that optical-fiber network reflects.
Second aspect,
A kind of optical communication system is provided, comprises optical line terminal and optical network unit, described optical line terminal comprises above-mentioned optical-fiber network monitoring modular.
The third aspect,
A kind of optical-fiber network monitoring method is provided, and described method comprises the steps:
Launch descending light wave to optical-fiber network;
Receive the first reverberation that described descending light wave reflects through optical-fiber network;
To the optical-fiber network emission test light wave identical with the wavelength of up light wave;
Receive the second reverberation that described test light wave reflects through optical-fiber network;
Judge the operating state of optical-fiber network according to the light wave that reflects through optical-fiber network.
Concrete, the wavelength of described descending light wave is 1490nm; The wavelength of described up light wave is 1310nm.
Further, before the operating state of described light wave judgement optical-fiber network according to reflecting through optical-fiber network, also comprise:
To optical-fiber network emission with equal different the third light wave of the wavelength of descending light wave and up light wave;
Receive the 3rd reverberation that described the third light wave reflects through optical-fiber network.
The monitoring modular that the embodiment of the invention provides adopts PLC(Planar Light-wave Circuit, planar lightwave circuit) four-way (comprising: the emission light path of uplink and downlink data light path and test wavelength and reverberation receiving light path) structure, descending light wave and the detection of test light wave reflection light are combined, its test specification covers two kinds of wavelength, and power of test is promoted; And, the test light wave that present embodiment adopts is identical with the wavelength of up light wave, because the network end-point pair light reflectivity identical with the wavelength of up light wave is higher, therefore with it as wavelength to be detected, network environment limited for dynamic range and large branching ratio is especially applicable, can effectively solve because the problem of the detection poor effect that network rear end reflected energy causes a little less than realizes the optical-fiber network of large branching ratio is monitored accurately and effectively, and then improves the stability of communication service.
Description of drawings
Fig. 1-the 1st, prior art adopts external OTDR to carry out the system configuration schematic diagram of optical-fiber network monitoring;
Fig. 1-2 is that prior art adopts built-in OTDR to carry out the system configuration schematic diagram of optical-fiber network monitoring;
Fig. 2 is the OLT optical module structure schematic diagram of Integrated Light time-domain reflectomer function in the prior art;
Fig. 3 is the structural representation () of the optical-fiber network monitoring modular that provides of first embodiment of the invention;
Fig. 4 is the structural representation (two) of the optical-fiber network monitoring modular that provides of first embodiment of the invention;
Fig. 5 is the structural representation (three) of the optical-fiber network monitoring modular that provides of first embodiment of the invention;
Fig. 6 is the structural representation (four) of the optical-fiber network monitoring modular that provides of first embodiment of the invention;
Fig. 7 is the flow chart of the optical-fiber network monitoring method that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with specific embodiment specific implementation of the present invention is described in detail:
Embodiment one:
Fig. 3 shows the structural representation of the optical-fiber network monitoring modular that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with present embodiment.
This optical-fiber network monitoring modular comprises the first emitter 101, first receiving device 102, the second emitter 103, and the second receiving system 104.Wherein: the first emitter 101 is launched descending light wave to optical-fiber network, this descending light wave can or break down owing to back scattering in the process of transmitting to user side and be partially reflected, the first reverberation that reflects through optical-fiber network returns along original optical path, received by first receiving device 102, this first reverberation provides the data foundation as a kind of light wave to be detected for monitoring.In addition, the second emitter 103 is to optical-fiber network transmission test light wave, this test light wave is identical to the wavelength of the up light wave of network local side transmission with user side, test the same meeting of light wave because back scattering or fault are partially reflected, the second reverberation that reflects is received by the second receiving system 104, and this second reverberation then provides data as another kind light wave to be detected for monitoring.In actual monitoring work, by detecting descending light wave and test light wave reflection ripple, utilize default algorithm that descending light wave, the test light of sending involved reflected wave and carry out the data processing, realize the real-time detection to network failure, guarantee the stable of network state.
The monitoring modular that the embodiment of the invention provides adopts PLC(Planar Light-wave Circuit, planar lightwave circuit) four-way structure, descending light wave and the detection of test light wave reflection light are combined, and its test specification covers two kinds of wavelength, and power of test is promoted; And, the test light wave that present embodiment adopts is identical with the wavelength of up light wave, because the network end-point pair light reflectivity identical with the wavelength of up light wave is higher, therefore with it as wavelength to be detected, network environment limited for dynamic range and large branching ratio is especially applicable, can effectively solve because the problem of the detection poor effect that network rear end reflected energy causes a little less than realizes the optical-fiber network of large branching ratio is monitored accurately and effectively, and then improves the stability of communication service.
It is 1490nm that monitoring modular in the embodiment of the invention can be used for descending light wave, up light wave is the optical-fiber network of 1310nm, the wavelength that is the descending light wave that sends of above-mentioned the first emitter 101 is 1490nm, and the wavelength of the test light wave that the second emitter 103 sends is 1310nm.
Further combined with accompanying drawing 3, preferred, the first emitter 101, first receiving device 102, the second emitter 103, and the second receiving system 104 all carries out input and the output of light signal by waveguide.Concrete, the first emitter 101 is connected with first receiving device can pass through optical branching device (the first optical branching device 105) connection one waveguide (first wave guide 106), by first wave guide 106 the descending light wave that the first emitter 101 sends is exported to optical-fiber network, receive the first reverberation that optical-fiber network reflects by first wave guide 106 simultaneously, and the first reverberation is transferred to first receiving device 102 by the first optical branching device 105.Same, the second emitter 103 be connected receiving system 104 and connect the second waveguide 108 by the second optical branching device 107, by the second waveguide 108 the test light wave direction optical-fiber network that the second emitter 103 sends is exported, receive simultaneously the second reverberation that optical-fiber network reflects and the up light wave of user side emission, and it is transferred to the second receiving system 104 by the second optical branching device 107.
Further, this module can also comprise the 3rd waveguide 109, be coupled with first wave guide 106 and the second waveguide 108, the 3rd waveguide 109 is direct interaction passages of this monitoring modular and optical-fiber network, on the one hand the descending light wave of first wave guide 106 outputs and the test light wave of the second waveguide 108 outputs are directly outputed to optical-fiber network, the first reflection optical coupler with the optical-fiber network reflection is bonded to first wave guide 106 on the other hand, and the second reverberation and up light wave are coupled to the second waveguide 108.
Further, with reference to the accompanying drawings 4, the first emitter 101 is connected with first receiving device and can also be connected the first optical branching device 105 by the 4th waveguide 110 with the 5th waveguide 111 respectively, descending light wave is by the 4th waveguide 110 inputs the first optical branching device 105, the first reverberation exports the 5th waveguide 111 to through the first optical branching device 105, and then input first receiving device 102.Same, the second emitter 103 be connected receiving system 104 and can be respectively connect the second optical branching device 107 by the 6th waveguide 112 and the 7th waveguide 113, the test light wave is by the 6th waveguide 112 inputs the second optical branching device 105, the second reverberation and up light wave export the 7th waveguide 113 to through the second optical branching device 107, and then input the second receiving system 104.
The embodiment of the invention is by up, the descending light wave of waveguide and test light wave and first, second reverberation, compare with the mode of traditional employing space optical coupling, the installation site of each device and the design comparison of relative distance are flexible, can significantly reduce the module volume; And the mode of space optical coupling is high to the assembly precision requirement of each device, causes easily test error, adopts waveguide to carry out the light transmission, needn't carry out complicated meticulous light path control, is convenient to the device assembling, can reduce test error, and then the reduction assembly cost.
A kind of improvement as present embodiment, can process the end of first wave guide 106, the second waveguide 108 and the 3rd waveguide 109, the end that each waveguide and other waveguides are coupled is made into taper, its concrete form is that the non-end face along waveguide becomes large gradually to end face, to increase the incident area of end face, light entrance face can be adjusted as required, and then realizes the reception of catering to incident light, thereby improves the coupling efficiency of light wave.
Further, can the splitting ratio of above-mentioned the first optical branching device 105 and the second optical branching device 107 be designed, preferably, the first optical branching device 105 is 9:1 to the energy of the descending light wave of first wave guide 106 output with ratio to the first catoptrical energy of first receiving device 102 outputs, to guarantee that the first catoptrical reception can on transmission and the mass formation impact of descending light wave, not guarantee the smooth transmission of descending light wave.The second optical branching device 107 is 9:1 to the energy of the up light wave of the second receiving system 104 output with ratio to the energy of the test light wave of the second waveguide 108 outputs, guarantees that the test light wave can not affect the quality of reception of up light wave.
In embodiments of the present invention, can also comprise that one is used for cooperating the device of light wave coupled transfer.Preferably, this device can be a mirror coating 114, mirror coating 114 can optionally reflect and transmission light wave, this mirror coating 114 reflects the descending light wave of first wave guide 106 outputs to optical-fiber network, can reflex in the 3rd waveguide 109, by the 3rd waveguide 109 input optical-fiber networks, simultaneously, the first reverberation of the 3rd waveguide 109 transmission is reflexed in the first wave guide 106, exported to first receiving device 102 by first wave guide 106.And, test light wave direction the 3rd waveguide 109 transmissions that mirror coating 114 is also exported the second waveguide 108, by the 3rd waveguide 109 input optical-fiber networks, the up light wave that simultaneously the 3rd waveguide 109 is transmitted and the second reverberation transfer to the second receiving system 104 to the second waveguide 108 transmissions by the second waveguide 108.
Concrete, mirror coating 114 is arranged between first wave guide 106 and the second waveguide 108, is air-gap between mirror coating 114 and first, second, third waveguide.As shown in Figure 3, the first emitter 101, first receiving device 102 places the left side of mirror coating 114-reflective side, the second emitter 103 and the second receiving system 104 place the right side-transparent side of mirror coating 114, descending light wave is reflected by mirror coating 114 after exporting through first wave guide 106, and then be coupled into the 3rd waveguide 109, simultaneously with the reflection of the first reverberation and be coupled into first wave guide 106; And, with the test light-wave transmission of the second waveguide 108 output and be coupled into the 3rd waveguide 109, with the second reverberation and up light-wave transmission and be coupled into the second waveguide 108.Certainly, the first emitter 101 and first receiving device 102 and the second emitter 103 and the second receiving system 104 also can change over.
In embodiments of the present invention, mirror coating 114 can be with first, second and third waveguide connects as one, when Practical manufacturing, can be in advance with first, second, the coupled end of the 3rd waveguide and mirror coating 114 reasonably mate design, when the processing respective waveguide, adopt identical processes moulding and plated film, make mirror coating 114 and first, second, the 3rd waveguide forms fixing integrative-structure, this integrative-structure is compared with the mode of inserting again corresponding eyeglass in waveguide arrangement after well, can avoid the bad problem of eyeglass and waveguide coupling, and then can guarantee to obtain the accuracy of data, guarantee the monitoring accuracy of module.Certainly, this device do not get rid of adopt TFF(Thin Film Filter, film filtering slice) 115 grades have the device of selective reflecting and transmission, such as Fig. 4, but for fear of the problem not good with the waveguide coupling occurring, present embodiment preferably adopts above-mentioned plated film sheet 114.
With reference to the accompanying drawings 5, as the preferred implementation of another kind, the device of this cooperation light wave coupling can also be a diffraction grating 116, same being used for is coupled to optical-fiber network with descending light wave and test light wave, the first reflection optical coupler is bonded to first receiving device 102, the second reverberation and up light wave are coupled to the second receiving system 104.This diffraction grating 116 can with respective waveguide lithography moulding on the same material, be integrally formed structure with waveguide with mirror coating 114.And from adopt mirror coating different be that this diffraction grating 116 can be arranged at the homonymy of first wave guide 106, the second waveguide 108 and the 3rd waveguide 109.Descending light wave from first wave guide 106 outputs, test light wave from the second waveguide 108 outputs all is coupled to the 3rd waveguide 109 by diffraction grating 116, and first, second reverberation and the up light wave exported through the 3rd waveguide 109 are coupled in corresponding first wave guide 106 and the second waveguide 108 through diffraction grating 116.Adopt diffraction grating 116 to cooperate the coupled transfer of light signals, each emitter and receiving system and waveguide can be arranged at the homonymy of diffraction grating 116, and then shorten to a certain extent the length of monitoring modular.
Improve as the another kind of the embodiment of the invention, can also set up the 3rd emitter 117, send with equal different the third light wave of above-mentioned descending light wave and the wavelength of testing light wave, such as Fig. 6.This third light wave can be received by first receiving device 102 through the 3rd reverberation that optical-fiber network reflects.Concrete, can between the first optical branching device 105 and first receiving device 102, set up the 3rd optical branching device 118, being connected the 3rd optical branching device 118, the three reverberation transfers to first receiving device 102 through the first optical branching device 105 and the 3rd optical branching device 118 jointly with first receiving device 102 to make the 3rd emitter 117.The splitting ratio of the 3rd optical branching device 118 can be 1:1, and namely the ratio through the 3rd catoptrical energy of the third light wave of the 3rd optical branching device 118 output and input is 1:1.The wavelength of this third light wave can reasonably arrange according to the monitoring situation of reality, can be 1650nm or 1625nm, can also select other rational wavelength.
The embodiment of the invention further promotes the power of test of this module by increasing the third test light wave.And, can also continue according to actual needs to increase other test wavelengths, with further expansion monitoring range.
In the monitoring of reality, can select according to the situation of network to be detected the wavelength of test, can be separately the reverberation of descending light wave be detected, or separately test light wave reflection light is detected, or the reverberation of the third light wave detected, certainly present embodiment preferably detects the multi-wavelength and combines, with more accurate Sampling network fault and to its location.
The optical-fiber network monitoring modular that the embodiment of the invention provides is applicable to optical communication system, can effectively detect the information such as position that fault in the fiber optic network and fault occur by this monitoring modular, and then guarantees the stability of communication.
Embodiment two:Fig. 7 shows the flow chart of the optical-fiber network monitoring method that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with present embodiment.
In step S201, launch descending light wave to optical-fiber network;
In step S202, receive the first reverberation that descending light wave reflects through optical-fiber network;
In step S203, launch with the identical test light wave of the wavelength of up light wave to optical-fiber network;
In step S204, receive the second reverberation that the test light wave reflects through optical-fiber network;
In step S205, judge the operating state of optical-fiber network according to the light wave that reflects through optical-fiber network.
The optical-fiber network monitoring modular that the monitoring method that the embodiment of the invention provides can rely on above-described embodiment one to be provided is realized.Namely launch descending light wave by the first emitter, receive the first reverberation by first receiving device, send the test light wave by the second emitter, receive the second reverberation by the second receiving system.And, can cooperate by respective waveguide and mirror coating or diffraction grating and carry out coupling and the transmission of light wave, its detailed content is described with embodiment one, repeats no more herein.
This monitoring method combines descending light wave and the detection of test light wave reflection light, and its test specification covers two kinds of wavelength, and power of test is promoted; And, the test light wave is identical with the wavelength of up light wave, because the network end-point pair light reflectivity identical with the wavelength of up light wave is higher, therefore with it as wavelength to be detected, network environment limited for dynamic range and large branching ratio is especially applicable, can effectively solve because the problem of the detection poor effect that network rear end reflected energy causes a little less than realizes the optical-fiber network of large branching ratio is monitored accurately and effectively, and then improves the stability of communication service.
Further, the wavelength of the descending light wave in the present embodiment can be 1490nm, and the wavelength of up light wave can be 1310nm.
Further, can also increase the testing procedure of the third light wave, concrete: as before carrying out step S205, can also to carry out following step:
With equal different the third light wave of the wavelength of descending light wave and up light wave, and receive the 3rd reverberation that the third light wave reflects through optical-fiber network to optical-fiber network emission.
The embodiment of the invention further promotes the power of test of this module by increasing the third test light wave.The wavelength of this third light wave can be 1650nm or 1625nm, can also be other rational wavelength.And present embodiment can also be tested light wave with the network condition increase of reality as required, with further expansion monitoring range, promotes the stability of communication system.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. an optical-fiber network monitoring modular is characterized in that, comprising:
The first emitter is used for launching descending light wave;
First receiving device is used for receiving the first reverberation that described descending light wave reflects through optical-fiber network;
The second emitter is used for the emission test light wave identical with the wavelength of up light wave;
The second receiving system is used for receiving the second reverberation that up light wave and described test light wave reflect through optical-fiber network.
2. optical-fiber network monitoring modular as claimed in claim 1 is characterized in that, described the first emitter is connected the first optical branching device and connects first wave guide with first receiving device,
Described first wave guide is used for described descending light wave is exported to optical-fiber network, and described the first reverberation is transmitted to first receiving device by the first optical branching device;
Described the second emitter be connected receiving system and connect the second waveguide by the second optical branching device;
Described the second waveguide is used for described test light wave direction optical-fiber network output, and described the second reverberation and up light wave are transmitted to the second receiving system by the second optical branching device.
3. optical-fiber network monitoring modular as claimed in claim 2, it is characterized in that, also comprise the 3rd waveguide, be used for carrying out coupled transfer with described first wave guide and the second waveguide, with described descending light wave and the output of test light wave direction optical-fiber network, and described the first reflection optical coupler is bonded to first wave guide, the second reverberation and up light wave are coupled to the second waveguide.
4. optical-fiber network monitoring modular as claimed in claim 3 is characterized in that, the end of described first wave guide, the second waveguide and the 3rd waveguide is for the pyramidal structure that promotes coupling efficiency.
5. optical-fiber network monitoring modular as claimed in claim 2 is characterized in that, described the first optical branching device is 9:1 to the energy of the descending light wave of described first wave guide output with ratio to the first catoptrical energy of first receiving device output;
Described the second optical branching device is 9:1 to the energy of the up light wave of described the second receiving system output with ratio to the energy of the test light wave of the second waveguide output.
6. such as each described optical-fiber network monitoring modular of claim 2 to 5, it is characterized in that, also comprise:
Mirror coating is used for the descending light wave of described first wave guide output is reflected or transmission to optical-fiber network, and described the first reverberation is reflected or transmission to first wave guide; And
With the optical-fiber network transmission of test light wave direction or the reflection of described the second waveguide output, and with described up light wave and the second reverberation to the second waveguide transmission or reflection.
7. optical-fiber network monitoring modular as claimed in claim 6 is characterized in that, described mirror coating and described first wave guide and the second waveguide are structure as a whole.
8. such as each described optical-fiber network monitoring modular of claim 2 to 5, it is characterized in that, also comprise:
Diffraction grating is used for the descending light wave of described first wave guide output and the test light wave of the second waveguide output are coupled to optical-fiber network, and described the first reverberation is coupled to first wave guide, with the second reverberation and up light wave to the second waveguide-coupled.
9. optical-fiber network monitoring modular as claimed in claim 1 is characterized in that, also comprises:
The 3rd emitter is used for sending with descending light wave the third light wave different with the wavelength of described test light wave;
Described the third light wave is received by described first receiving device or the second receiving system through the 3rd reverberation that optical-fiber network reflects.
10. an optical communication system comprises optical line terminal and optical network unit, it is characterized in that, described optical line terminal comprises any optical-fiber network monitoring modular of claim 1 ~ 9.
11. an optical-fiber network monitoring method is characterized in that described method comprises the steps:
Launch descending light wave to optical-fiber network;
Receive the first reverberation that described descending light wave reflects through optical-fiber network;
To the optical-fiber network emission test light wave identical with the wavelength of up light wave;
Receive the second reverberation that described test light wave reflects through optical-fiber network;
Judge the operating state of optical-fiber network according to the light wave that reflects through optical-fiber network.
12. optical-fiber network monitoring method as claimed in claim 11 is characterized in that, the wavelength of described descending light wave is 1490nm; The wavelength of described up light wave is 1310nm.
13. optical-fiber network monitoring method as claimed in claim 12 is characterized in that, also comprises before the operating state of described light wave judgement optical-fiber network according to reflecting through optical-fiber network:
To optical-fiber network emission with equal different the third light wave of the wavelength of descending light wave and up light wave;
Receive the 3rd reverberation that described the third light wave reflects through optical-fiber network.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/078972 WO2014012256A1 (en) | 2012-07-20 | 2012-07-20 | Optical network monitoring module, optical communication network, and optical network monitoring method |
Publications (2)
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| WO2016049858A1 (en) * | 2014-09-30 | 2016-04-07 | 华为技术有限公司 | Multipath optical transceiver module and associated equipment |
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| JP6636540B2 (en) * | 2015-04-09 | 2020-01-29 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | Optical transmission and reception using self-homodyne detection (SHD) and remote modulation |
| CN113572520B (en) * | 2020-04-29 | 2022-10-04 | 华为技术有限公司 | Optical network terminal and method for determining port connected with optical network terminal |
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| CN101790111A (en) * | 2009-01-23 | 2010-07-28 | 华为技术有限公司 | Method and device and system for detecting light distributed network |
| CN102122989A (en) * | 2010-01-08 | 2011-07-13 | 华为技术有限公司 | Line monitoring method, device and system |
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| WO2014012256A1 (en) | 2014-01-23 |
| CN102893539B (en) | 2015-08-26 |
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