CN202334525U - Optical network unit and passive optical network - Google Patents
Optical network unit and passive optical network Download PDFInfo
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- CN202334525U CN202334525U CN2011204817352U CN201120481735U CN202334525U CN 202334525 U CN202334525 U CN 202334525U CN 2011204817352 U CN2011204817352 U CN 2011204817352U CN 201120481735 U CN201120481735 U CN 201120481735U CN 202334525 U CN202334525 U CN 202334525U
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Abstract
The embodiment of the utility model provides an optical network unit and a passive optical network. The optical network unit comprises a plurality of optical elements, wherein at least one optical element is provided with a reflector which is used for reflecting test signals of OTDR (Optical Time Domain Reflectometer). According to the optical network unit and the passive optical network, provided by the embodiment of the utility model, the reflector used for reflecting the test signals is arranged on the at least one optical element on the ONU (Optical Network unit) and is integrated on the ONU, so that the signal loss of a link of the PON (Passive Optical Network) is realized.
Description
Technical field
The utility model relates to communication technical field, particularly a kind of optical network unit and EPON.
Background technology
At present, the Fibre Optical Communication Technology that bandwidth capacity is huge is increasingly mature, and (Passive Optical Network, PON) Optical Access Network becomes the strong competitor of broadband access network of future generation to EPON.At fiber optic communication field; Optical time domain reflectometer (Optical Time Domain Reflectrometer; OTDR) be a kind of very important tester; OTDR is through emissioning testing signal in testing fiber, and retroreflection in the measuring optical fiber and scattered signal know that the state information of testing fiber circuit carries out fault location.
In the prior art, (Optical Distribution Network ODN) increases reflector on the link, be used to reflect the test wavelength of OTDR emission at optical distribution network usually.The test wavelength of OTDR emission is through optical switch (Optical Switch; OSW) and wavelength division multiplexer (Wavelength Division Multiplex WDM) is coupled on the PON link, together is transferred to optical network unit (Optical Network Unit with descending optical wavelength; ONU) side; At the reflector place, descending optical wavelength is through being received by the optical module of ONU side after the transmission of reflector, and the test wavelength is through after the reflection of reflector; Turn back to OTDR equipment along former road, so that OTDR carries out fault location according to the test signal of returning.
Yet reflector needs independent the deployment in the prior art, brings extra loss of signal can for the PON link.
The utility model content
The utility model embodiment provides a kind of optical network unit and EPON, integrated reflector on ONU, and realization reduces the loss of signal of PON link.
On the one hand, the utility model embodiment provides a kind of optical network unit, comprising: a plurality of optical assemblies, wherein, said at least one optical assembly is provided with and is used for reflector that optical time domain reflectometer OTDR test signal is reflected.
On the other hand, the utility model embodiment also provides a kind of EPON, comprising: optical line terminal OLT, optical time domain reflectometer OTDR, optical distribution network ODN and at least one optical network unit ONT with at least one transceiver;
Said ONT comprises: a plurality of optical assemblies, wherein, at least one optical assembly is provided with and is used for reflector that optical time domain reflectometer OTDR test signal is reflected.
Optical network unit that the utility model embodiment provides and EPON, the reflector through at least one optical assembly on the ONU, being provided for test signal is reflected is integrated on the ONU reflector, realizes reducing the loss of signal of PON link.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment 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 embodiment of the utility model, 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.
The cutaway view of ceramic insertion core among the embodiment of reflector in the optical network unit that Fig. 1 provides for the utility model;
The cutaway view of ceramic insertion core among another embodiment of reflector in the optical network unit that Fig. 2 provides for the utility model;
The cutaway view of ceramic insertion core among another embodiment of reflector in the optical network unit that Fig. 3 provides for the utility model;
The structural representation of ROSA among another embodiment of reflector in the optical network unit that Fig. 4 provides for the utility model;
The structural representation of ROSA among another embodiment of reflector in the optical network unit that Fig. 5 provides for the utility model;
The structural representation of another embodiment of reflector in the optical network unit that Fig. 6 provides for the utility model;
Fig. 7 is a kind of structural representation that tradition adopts the ONU of PLC;
The cutaway view of ceramic insertion core among another embodiment of optical network unit that Fig. 8 provides for the utility model;
The cutaway view of ceramic insertion core among another embodiment of optical network unit that Fig. 9 provides for the utility model;
The cutaway view of ceramic insertion core among another embodiment of optical network unit that Figure 10 provides for the utility model;
The cutaway view of ceramic insertion core among another embodiment of optical network unit that Figure 11 provides for the utility model;
Figure 12 is another structural representation that tradition adopts the ONU of PLC;
The cutaway view of ceramic insertion core among another embodiment of optical network unit that Figure 13 provides for the utility model;
The structural representation of an embodiment of EPON who provides for the utility model shown in Figure 14;
The structural representation of another embodiment of EPON that provides for the utility model shown in Figure 15.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer; To combine the accompanying drawing among the utility model embodiment below; Technical scheme among the utility model embodiment is carried out clear, intactly description; Obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, 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 utility model protection.
Among embodiment of the optical network unit that the utility model provides, comprise a plurality of optical assemblies, also comprise: be arranged at least one optical assembly, be used for reflector that optical time domain reflectometer OTDR test signal is reflected.
Wherein, the optical assembly that the utility model relates to, specifically can be among the ONU optical assembly (OpticalSub_Assembly, OSA), for example: three-dimensional optical assembly (Triplex), light transmit-receive integrated assembly (Bi-direction Optical Sub-assembly; BOSA), receive optical assembly (Receiver Optical Sub_Assembly, the connector that ROSA) perhaps is connected etc. with tail optical fiber.
Be used for reflector (Reflector) that the OTDR test signal is reflected, can integratedly be arranged on the Triplex among the ONU, on the optical assemblies such as BOSA, ROSA or connector, thereby reduce the loss of signal of PON link.The reflector that is integrated on the ONU can reflect the test signal that OTDR sends, and makes the former road of test signal be back to OTDR.Below be that example will be to how the integrated reflector that is provided with is elaborated on the optical assembly with the BOSA that is used for ONT.
As a kind of possible implementation, reflector can be arranged on the ceramic insertion core among the ONU.Because some optical assemblies among the ONU, for example: have ceramic insertion core in BOSA or the ROSA, therefore, reflector can be arranged in the ceramic insertion core of these optical assemblies; And among the ONU of some magnetic tape trailers fibres; The connector that is connected with tail optical fiber; For example: UPC (Ultra-polished Connectors), APC (Angle-polished Connectors), etc. have ceramic insertion core in the style connector; Therefore, in the ceramic insertion core in the connector that reflector also can be arranged on tail optical fiber is connected.
The cutaway view of ceramic insertion core among the embodiment of reflector in the optical network unit that provides for the utility model shown in Figure 1; As shown in Figure 1; For the reflector that is arranged on the ceramic insertion core 11; Can realize through on the end face of ceramic insertion core 11, passing through coating process, can be with the first filming 12 that on ceramic insertion core 11 end faces, forms as the reflector that is used for test signal is reflected.
Under a kind of enforcement scene, OTDR test signal and downstream signal can adopt same downstream wavelength (i.e. first wavelength) to carry.The setting of material and thickness through the first filming 12; The reflectivity that can realize 12 pairs first wavelength signals of the first filming is x; Can preferred 0.1%～1% wherein; Can comprise the downstream signal of OLT transmission and the mixed signal of OTDR test signal in first wavelength signals, also can include only OTDR test signal (downlink business interrupts when promptly testing).The wavelength of common first wavelength signals is 1490nm; Reflectivity through 12 pairs first wavelength signals of the first filming is set to x, can be preferred 0.1%～1%, when x preferred 0.1%～1% the time; Can realize to first wavelength signals carry out approximately-30dB～-reflection of 20dB; Wherein ,-20dB and reflectivity are 0.01 corresponding, and-30dB and reflectivity are 0.001 corresponding.
The setting of material and thickness through the first filming 12; The transmissivity that can realize 12 pairs second wavelength signals of the first filming is close to 100%; Wherein, second wavelength signals is the upward signal that ONU sends to OLT, and the wavelength of common second wavelength signals is 1310nm; Realize the transmissivity of second wavelength signals is close to 100% through the first filming 12, can realize total transmissivity basically second wavelength signals.But need to prove; Because the restriction of coating process itself; The transmissivity that may not accomplish 12 pairs second wavelength signals of the first filming reaches 100% fully, but when plated film, the transmissivity that need as far as possible control 12 pairs second wavelength signals of the first filming is near 100%.
Implement under the scene at another kind, the OTDR test signal can adopt the individual wavelengths all inequality with the up-downgoing wavelength (i.e. three-wavelength) to carry.The setting of material and thickness through the first filming 12; The reflectivity that can realize 12 pairs of three-wavelengths of the first filming reaches z; Z can be preferred 100%, and wherein, the three-wavelength signal is the OTDR test signal; The wavelength of common three-wavelength signal is 1625nm or 1650nm, through the first filming 12 being realized give OTDR with the whole reflected backs of three-wavelength signal.
The cutaway view of ceramic insertion core among another embodiment of reflector is as shown in Figure 2 in the optical network unit that provides for the utility model shown in Figure 2, can also be with forming fiber grating 14 as reflector through etching on the tail optical fiber in ceramic insertion core 11.
With similar at ceramic insertion core 11 end face coatings formation reflector; Under a kind of enforcement scene, through the length setting of fiber grating 14, the reflectivity that can realize 14 pairs first wavelength signals of fiber grating is x; Can preferred 0.1%～1%; Wherein, the downstream signal of OLT transmission and the mixed signal of OTDR test signal can be comprised in first wavelength signals, also the OTDR test signal can be included only; Reflectivity through 14 pairs first wavelength signals of fiber grating is set to x, can be preferred 0.1%～1%, can realize to first wavelength signals carry out approximately-30dB～-reflection of 20dB.
Through the length setting of fiber grating 14, can realize that the transmissivity of 14 pairs second wavelength signals of fiber grating is close to 100%, wherein, second wavelength signals is the upward signal that ONU sends to OLT; Realize the transmissivity of second wavelength signals is close to 100% through fiber grating 14, can realize total transmissivity basically second wavelength signals.But need to prove; Tail optical fiber in the ceramic insertion core 11 is partly processed fiber grating; The transmissivity that may not accomplish 14 pairs second wavelength signals of fiber grating reaches 100% fully; But can be when forming fiber grating, the transmissivity of as far as possible controlling 14 pairs second wavelength signals of fiber grating is near 100%.
Implement under the scene at another kind; Through the length setting of fiber grating 14, can realize that the reflectivity of 14 pairs of three-wavelengths of fiber grating reaches 100%, wherein; The three-wavelength signal is the OTDR test signal, through fiber grating 14 can be realized the whole reflected back OTDR of three-wavelength signal.
The cutaway view of ceramic insertion core among another embodiment of reflector in the optical network unit that provides for the utility model shown in Figure 3; As shown in Figure 3; In the present embodiment, can with the part tail optical fiber 13 in the ceramic insertion core 11 after the refractive index of overdoping or etching is handled as reflector.
Suppose that the ray refractive index without the tail optical fiber after the refractive index processing is n1, the ray refractive index of the tail optical fiber after then handling through refractive index is n2:n2=(2* (1+x) * n1)+4*n1*sqrt (x))/(2* (1-x));
Wherein: x is the reflectivity of first wavelength signals of optical line terminal transmission, can comprise the downstream signal of OLT transmission and the mixed signal of OTDR test signal in first wavelength signals, also can include only the OTDR test signal.
Thereby can be n1 according to the ray refractive index of tail optical fiber, and the reflectivity x of first wavelength signals confirm to handle the refractive index of back as the tail optical fiber part of reflector through refractive index.
Similar with previous embodiment, through mixing or the difference of the tail optical fiber length that the refractive index of etching is handled, can realize that its reflectivity to first wavelength signals is 0.001-0.01; Transmissivity to second wavelength signals is 100%; Reflectivity to three-wavelength reaches 100%.
As another kind of possible implementation, reflector can also be arranged on the ROSA among the ONU, specifically can be arranged on the ROSA of devices such as BOSA or Triplex.
The structural representation of ROSA among another embodiment of reflector in the optical network unit that provides for the utility model shown in Figure 4; As shown in Figure 4; In the present embodiment; Reflector can be arranged on the lens 42 of ROSA41, specifically can be on the lens 42 of ROSA41, to form second plated film through coating process, with this second plated film as reflector.
Similar with formation the first filming on the end face of ceramic insertion core; Under a kind of enforcement scene; When OTDR test signal and downstream signal adopted the first identical wavelength to carry, the setting of material and thickness through second plated film can realize that second plated film is x to the reflectivity of first wavelength signals; Preferred x is 0.1%～1%; Wherein, the downstream signal of OLT transmission and the mixed signal of the test signal that OTDR sends can be comprised in first wavelength signals, also the OTDR test signal can be included only; Through second plated film reflectivity of first wavelength signals is set to x, preferred x is 0.1%～1%, can realize to first wavelength signals carry out-30dB～-reflection of 20dB.
The setting of material and thickness through second plated film can realize that second plated film is close to 100% to the transmissivity of second wavelength signals, and wherein, second wavelength signals is the upward signal that ONU sends to OLT; Realize the transmissivity of second wavelength signals is close to 100% through second plated film, can realize total transmissivity basically second wavelength signals.Equally because the restriction of coating process itself may not accomplish that second plated film reaches 100% fully to the transmissivity of second wavelength signals, but when plated film, need control as far as possible second plated film to the transmissivity of second wavelength signals near 100%.
Implement under the scene at another kind; When the OTDR test signal adopts the three-wavelength that is independent of the up-downgoing wavelength to carry; The setting of material and thickness through second plated film can realize that second plated film reaches 100% to the reflectivity of three-wavelength, wherein; The three-wavelength signal is the OTDR test signal, through second plated film can be realized the whole reflected back OTDR of three-wavelength signal.
The structural representation of ROSA among another embodiment of reflector in the optical network unit that provides for the utility model shown in Figure 5; As shown in Figure 5; In the present embodiment, can make filter realize the function of reflector through the filter in the ROSA41 (Filter) 43 is provided with.
Wherein, the filter 43 in the ROSA41 is commonly referred to as 0 degree Cut Filter, and in the prior art, 0 degree Cut Filter can transmission first wavelength signals, and the signal of other wavelength of filtering.Among the utility model embodiment, can make it can be used for first wavelength signals of partial reflection through frequency filtering setting to filter 43.Specifically be; Need 43 pairs first wavelength of filter among the ROSA41 to form a certain proportion of reflection and transmission, suppose to represent with x the reflectivity of 43 pairs first wavelength signals of filter, y representes the transmissivity of 43 pairs first wavelength signals of filter; X+y=1 then, preferred x=0.1%～1%.
As another possible implementation, can also be in ONU the wave division multiplexing WDM filter and with connector that tail optical fiber is connected in ceramic insertion core between the filter plate or the reflector plate that insert, with this filter plate or reflector plate as reflector.
The structural representation of another embodiment of reflector in the optical network unit that provides for the utility model shown in Figure 6; As shown in Figure 6; Wherein, wave division multiplexing WDM filter 61 can be the WDM filter plate that is provided with along horizontal optical path 45 degree, is also referred to as 45 degree WDM filters.When OTDR test signal and downstream signal adopt the first identical wavelength to carry, can between this 45 degree WDM filter and ceramic insertion core 62, insert filter plate 63a or reflector plate 63b.Realize a certain proportion of reflection and transmission through this filter plate 63a or reflector plate 63b to first wavelength signals; Wherein, Suppose to represent filter plate 63a or reflector plate 63b reflectivity to first wavelength signals with x; Y representes filter plate 63a or the reflector plate 63b transmissivity to first wavelength signals, x+y=1 then, preferred x=0.1%～1%.
When the OTDR test signal adopts the three-wavelength that is independent of the up-downgoing wavelength to carry, can also realize that the reflectivity to the three-wavelength signal is z through filter plate 63a or reflector plate 63b, z is preferably 100%, and promptly the reflectivity to three-wavelength reaches 100%.
The utility model also provide ONU adopt planar optical waveguide (Planar Lightwave Circuit, in the time of PLC), the concrete implementation of the last integrated reflector of ONU.
Shown in Figure 7 is a kind of structural representation of ONU optical assembly that tradition adopts PLC; As shown in Figure 7, comprising: be used to receive downstream signal first port 71, be used for to photo-detector transmit said downstream signal second port 72, be used to send the 3rd port 73 of upward signal and the wave division multiplexing WDM filter plate 74 that is used for the said downstream signal of transmission and reflects said upward signal; Wherein:
As a kind of possible implementation, as shown in Figure 8, reflector 75 can be arranged on WDM filter plate 74 on the one side of second port, and is perhaps as shown in Figure 9, and reflector 75 can also be arranged on second port 72.
Wherein, reflector 75 can be half anti-film or the filter sheet that pastes on the WDM filter plate 74, or passes through the half anti-film that plated film forms on WDM filter plate 74.When OTDR test signal and downstream signal adopted the first identical wavelength to carry, the reflectivity of 75 pairs first wavelength signals of reflector was x, and transmissivity is y, x+y=1, preferred x=0.1%～1%.First wavelength signals can comprise the downstream signal of OLT transmission and the mixed signal of OTDR test signal; Also can include only said OTDR test signal; Material and thickness setting through half anti-film or filter sheet; Can realize to first wavelength signals carry out-30dB～-reflection of 20dB, be 100% to the transmissivity of second wavelength signals; When the OTDR test signal adopted the three-wavelength that is independent of the up-downgoing wavelength to carry, material and thickness setting through half anti-film or filter sheet can realize the reflectivity of three-wavelength is reached z, and z is preferably 100%.
As another kind of possible implementation, shown in figure 10, reflector 75 can also be arranged between the WDM filter plate 74 and second port 72, and perhaps shown in figure 11, reflector 75 can also be arranged between first port 71 and the WDM filter plate 74.Wherein:
Wherein, when OTDR test signal and downstream signal adopted the first identical wavelength to carry, the PLC waveguide was different through the length of the grating that etching forms; Can realize that the reflectivity to first wavelength signals is x; Transmissivity is y, x+y=1, preferred x=0.1%～1%.First wavelength signals can comprise the downstream signal of OLT transmission and the mixed signal of OTDR test signal; Also can include only the OTDR test signal; The length of the grating that forms through photoetching or corrosion through the PLC waveguide is different, can realize to first wavelength signals carry out-30dB～-reflection of 20dB.
When the OTDR test signal adopts the three-wavelength that is independent of the up-downgoing wavelength to carry, different through the PLC waveguide through the length of the grating of photoetching or corrosion formation, can realize that the reflectivity to the three-wavelength signal is z, z is preferably 100%; Promptly the reflectivity to three-wavelength reaches 100%.
Shown in Figure 12 is another structural representation of ONU optical assembly that tradition adopts PLC; Shown in figure 12, comprising: be used to receive downstream signal first port 71, be used for to photo-detector transmit said downstream signal second port 72, be used to send the 3rd port 73 of upward signal and the wave division multiplexing WDM filter plate 74 that is used for the said downstream signal of transmission and reflects said upward signal; Wherein:
As a kind of possible implementation, shown in figure 13, reflector 75 can be arranged on WDM74 on the one side of second port 72.
Wherein, reflector 75 can be half anti-film or the filter sheet that pastes on the WDM filter plate 74, or passes through the half anti-film that plated film forms on WDM filter plate 74.When OTDR test signal and downstream signal adopted the first identical wavelength to carry, the reflectivity of 75 pairs first wavelength signals of reflector was x, and transmissivity is y, x+y=1, preferred x=0.1%～1%.First wavelength signals can comprise the downstream signal of OLT transmission and the mixed signal of OTDR test signal; Also can include only the OTDR test signal; Material and thickness setting through half anti-film or filter sheet; Can realize to first wavelength signals carry out-30dB～-reflection of 20dB, be 100% to the transmissivity of second wavelength signals.
When the OTDR test signal adopted the three-wavelength that is independent of the up-downgoing wavelength to carry, material and thickness setting through half anti-film or filter sheet can realize that the reflectivity to three-wavelength is z, and preferred z is 100%.
Based on the above-mentioned optical network unit that provides of the utility model; The utility model embodiment also further provides EPON; The structural representation of an embodiment of EPON who provides for the utility model shown in Figure 14; Shown in figure 14, this EPON comprises: optical line terminal 1, optical time domain reflectometer 2, optical distribution network 3 and at least one optical network unit 4 with at least one transceiver;
The concrete structure of the optical network unit ONU 4 of wherein, integrated reflector 41 can repeat no more at this referring to the utility model previous embodiment.Optical time domain reflectometer OTDR2 and optical line terminal OLT 1 can integrate setting (OTDR2 of being shown in Figure 14 and OLT1 integrate the enforcement scene of setting), also can distinguish independent setting.
OTDR2 can start under the control of OLT1 and sends test massage; Also can start and send test massage through Long-distance Control; For example: through single NMP (Simpe Network Management Protocol; SNMP) or telnet service agreement (Telnet) start test from webmaster control OLT; Can also be when OLT1 detects the line quality deterioration, for example: the error rate surpass to be set thresholding or OLT1 and is periodically started to satisfy under the test case to start when periodically imposing a condition and send test massage.
When testing; The test signal that OTDR2 sends can together be sent to ONU4 with the downstream signal that OLT1 sends; When testing; OTDR test signal and downstream signal can adopt same downstream wavelength (i.e. first wavelength) to carry, such as, the mixed signal of this test signal and downstream signal sends to ONU4 with first wavelength signals; Perhaps, when test, downlink business interrupts, and first wavelength signals only comprises the OTDR test signal, after test is accomplished, recovers the downlink business that interrupts again again.In alternate embodiment, the test signal that OTDR2 sends also can adopt with the up-downgoing wavelength mutually independently three-wavelength send to ONU4 separately, in this case, test signal is the three-wavelength signal.And send first wavelength signals or the three-wavelength signal can be pre-configured to the ONU4 side, also can when starting test, be provided with.。
If carry when OTDR test signal and downstream signal adopt the first identical wavelength; Local side sends first wavelength signals to ONU4; Owing to be provided with reflector 41 at least one optical assembly of ONU4; The reflectivity of supposing 41 pairs first wavelength signals of this reflector is x (0＜x＜1 is preferably 0.1%～1%).Then have 1-x part (comprise the mixed signal of downstream signal and test signal or include only test signal) to receive through reflector 41 and by the photo-detector among the ONU4 in first wavelength signals, former road turns back to OTDR after device 41 reflections and other x partly is reflected.
If the OTDT test signal adopts and up-downgoing wavelength three-wavelength independently mutually; Local side sends the three-wavelength signal to the ONU4 end; Owing to be provided with reflector 41 at least one optical assembly of ONU4; Then this reflector 41 can reflect the three-wavelength signal fully, and makes the former road of three-wavelength signal turn back to OTDR.
OTDR2 can detect the position of reflector 41 and the reflectivity of pip through the time-delay and the intensity of inverse signal.Because it is bigger to have increased the ONU4 end reflection rate of reflector 41; Therefore; On the curve of OTDR2, can form a spike, through the position and the Strength Changes of spike, OTDR2 can judge whether optical fiber link that each ONU4 connects possibly exist fault or change.For example: OTDR2 can just often preserve a test curve at the optical fiber link of a certain ONU, and the position of the reflection peak that ONU is corresponding in the test curve is xKm, and the reflectivity that calculates is-30dB.OTDR2 starts the reflection peak of testing the curve discovery xKm position that obtains and has disappeared, and can judge that then the optical fiber link before the ONU ruptures.If the OTDR2 test obtains curve and finds that the reflectivity of the reflection peak of xkm position drops to-40dB, then can judge ONUi optical fiber link generation severe attrition before.
On the basis of EPON shown in Figure 14; The utility model further provides EPON another embodiment; Shown in figure 15, owing to generally include a plurality of transceivers 11 in the optical line terminal OLT 1, for a plurality of transceivers 11 can multiplexing same OTDR2; Optional, optical switch 5 and at least one wavelength division multiplexer 6 can also further be set in the EPON; Wherein, optical switch 5 is connected with OTDR2, each wavelength division multiplexer 6 respectively with optical line terminal 1 in a transceiver 11 be connected with optical switch.
When OTDR2 need test transceiver 11 among the OLT1 and the link between the ONU4, optical switch 5 can be communicated with OTDR2 and this transceiver 11.The test signal that downstream signal that the WDM6 that is connected with this transceiver 11 can send this transceiver 11 and/or OTDR2 send is coupled to optical distribution network 3; And; The reflected signal that reflector among the ONU4 41 is reflected the test signal of returning is coupled to OTDR2, and the upward signal that the ONU4 that optical distribution network 3 is received sends is coupled to this transceiver 11.
As a kind of possible implementation; Can further include in the EPON: be connected with optical switch 5 with optical time domain reflectometer 2 respectively; Be used for optical switch 5 and optical time domain reflectometer 2 are controlled, and the test and management system 7 that the test curve of optical time domain reflectometer 2 is analyzed and handled.
When needs were tested certain road PON link, test and management system 7 was at first controlled optical switch 5 OTDR2 is connected with corresponding receiver 11, promptly controls optical switch 5 and switches to link to be measured; Test and management system 7 further sends starting command to OTDR2 and tests to start OTDR2; OTDR2 can to ONU4 send be independent of the up-downgoing wavelength the three-wavelength signal as the OTDR test signal, this three-wavelength test signal respectively through light open the light 5 with corresponding WDM6 after get into link to be measured; The three-wavelength signal arrives ONU4 and since ONU4 integrated the reflector 41 that the three-wavelength signal is carried out total reflection, therefore, the three-wavelength signal can be all or approximate whole former roads return, opening the light via WDM6 and light 5 is then received by OTDR2; OTDR2 goes out the position of reflector 41 and the reflectivity of pip through the time-delay and the strength investigation of inverse signal.Because the ONU4 end reflection rate that has increased reflector 41 is big (total reflection) very; Therefore; On the curve of OTDR2, can form a spike,, can judge whether optical fiber link that each ONU4 connects possibly exist fault or change through the position and the Strength Changes of spike.
Further, because in the PON of point-to-multipoint system, possibly reach 64 and 128 ONU4 and be connected in the same PON link.If require through PON link in a reflection peak location in the OTDR test curve.When having 64 ONU in the PON link, need 64 reflection peaks to stagger and to discern the position of each ONU.And based on the function of OTDR2; The spatial resolution index has determined the beeline interval of two adjacent events that OTDR can differentiate; Promptly work as the spatial resolution of the distance of two adjacent events greater than OTDR, then two incidents can be discerned for OTDR, otherwise can not be discerned by OTDR.
The ONU4 of the integrated reflector 41 that provides based on the utility model, OTDR2 can further combine the range information between ONU4 and the OLT1, reduces ONU in twos apart from requirement at interval.
Concrete: can obtain the range information between adjacent two ONT4 through OLT1 equipment; After OTDR2 obtains the test curve of PON link, can combine the range information between adjacent two ONT4, the OTDR curve is analyzed, on the OTDR curve, mark out the position of the reflection peak of each ONT4.For example:, can not judge the reflection peak position of each ONT separately through the OTDR curve, because the reflection peak of two ONU4 overlaps when the distance between two ONU4 during less than the spatial resolution of OTDR2.In this case, judge the reflection peak width that two ONU4 are overlapping and highly judge whether there are two ONU reflection peaks here according to the range information between adjacent two ONT4.The spatial resolution of supposing OTDR2 is 10m, and (20dB) width of the pip of reflectivity decline 10dB on the OTDR curve is 12m to ONU4 upper reflector 41.The distance of the one ONU and the 2nd ONU is 5m, and the reflectivity of an ONU and the 2nd ONU also is-20dB.On the OTDR curve, if the reflection peak width of position that detects an ONU and the 2nd ONU place is represented that then the reflection peak of an ONU and the 2nd ONU all exists, and can on the OTDR curve, be marked out the position of an ONU and the 2nd ONU greater than 15m.If the width that detects reflection peak, explains that the reflection peak of one of them ONU does not exist smaller or equal to 12m.Can confirm it specifically is that an ONU or the reflection peak of the 2nd ONU do not exist according to the position of reflection peak, for example: according to the range information between adjacent two ONT4, an ONU is at the 2nd ONU front 5m; The reflection peak position of the one ONU should for (X1, X1+12), the reflection peak position of the 2nd ONU should be (X1+5; X1+17) m; When the original position of confirming reflection peak less than x1+5m, can judge that then the reflection peak of an ONU exists, and the reflection peak of the 2nd ONU does not exist.End position＞x1+12m when confirming reflection peak can judge that then the reflection peak of an ONU does not exist, and the reflection peak of the 2nd ONU exists.
What should explain at last is: above embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous 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, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.
Claims (15)
1. an optical network unit is characterized in that, comprises a plurality of optical assemblies;
Wherein, at least one optical assembly is provided with and is used for reflector that optical time domain reflectometer OTDR test signal is reflected.
2. optical network unit according to claim 1 is characterized in that, in the ceramic insertion core in the optical fiber connector that said reflector is arranged on tail optical fiber is connected, perhaps, is arranged in the ceramic insertion core in light transmit-receive integrated assembly BOSA or the optical fiber receive module ROSA.
3. optical network unit according to claim 2 is characterized in that, said reflector is the first filming that is arranged on said ferrule endface, perhaps, and the fiber grating that the tail optical fiber in said ceramic insertion core forms.
4. optical network unit according to claim 2 is characterized in that, said reflector is the tail optical fiber after the refractive index that passing through doping or etching in the said ceramic insertion core is handled.
5. optical network unit according to claim 4; It is characterized in that; Ray refractive index without the tail optical fiber after the refractive index processing is n1; Ray refractive index through the tail optical fiber after the refractive index processing is n2, n2=(2* (1+x) * n1)+4*n1*sqrt (x))/(2* (1-x)), wherein: x is the reflectivity of first wavelength signals of optical line terminal transmission.
6. optical network unit according to claim 1 is characterized in that, said reflector is second plated film in the lens formation of ROSA.
7. optical network unit according to claim 1 is characterized in that, said reflector be arranged on into the wave division multiplexing WDM filter and with connector that tail optical fiber is connected in ceramic insertion core between filter plate or reflector plate.
8. optical network unit according to claim 1; It is characterized in that; Also comprise: planar optical waveguide PLC, said PLC comprises: be used to receive downstream signal first port, be used for to photo-detector send said downstream signal second port, be used to send the 3rd port of upward signal, the wave division multiplexing WDM filter plate that is used for the said downstream signal of transmission and reflects said upward signal; Said WDM filter plate is between first port of said PLC and second port and between the 3rd port and second port at said PLC, and said reflector is arranged on the one side of said WDM filter plate towards said second port; Perhaps, be arranged on said second port; Perhaps,
Said WDM filter plate is positioned at the end face of second port of said PLC, and said reflector is arranged on the one side of said WDM back to said second port.
9. optical network unit according to claim 8 is characterized in that, said reflector is half anti-film or filter sheet.
10. optical network unit according to claim 8 is characterized in that, said WDM filter plate is between first port of said PLC and second port and between the 3rd port and second port at said PLC:
Said reflector is arranged between said WDM filter plate and said second port, perhaps, is arranged between said first port and the said WDM filter plate.
11. optical network unit according to claim 10 is characterized in that, said reflector is the grating that forms in said PLC waveguide.
12. optical network unit according to claim 1 is characterized in that, said reflector is the filter that is arranged in the ROSA.
13. an EPON is characterized in that, comprising: have optical line terminal OLT, optical time domain reflectometer OTDR, the optical distribution network ODN of at least one transceiver and at least one is like each described optical network unit ONT of claim 1～12.
14. EPON according to claim 13 is characterized in that, also comprises: optical switch and at least one wavelength division multiplexer WDM;
Said optical switch is connected with said OTDR meter, each WDM respectively with said OLT in a transceiver be connected with said optical switch.
15. EPON according to claim 13 is characterized in that, said OTDR and said OLT integrate setting.
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| CN2011204817352U CN202334525U (en) | 2011-11-28 | 2011-11-28 | Optical network unit and passive optical network |
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| CN2011204817352U CN202334525U (en) | 2011-11-28 | 2011-11-28 | Optical network unit and passive optical network |
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| CN102868447A (en) * | 2012-09-24 | 2013-01-09 | 深圳太辰光通信股份有限公司 | Fiber grating tracker and fault detection method of optical fiber circuit |
| CN103297127A (en) * | 2013-06-09 | 2013-09-11 | 索尔思光电（成都）有限公司 | Optical network unit (ONU) optical module |
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| CN102868447A (en) * | 2012-09-24 | 2013-01-09 | 深圳太辰光通信股份有限公司 | Fiber grating tracker and fault detection method of optical fiber circuit |
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| CN102868447B (en) * | 2012-09-24 | 2015-07-15 | 深圳太辰光通信股份有限公司 | Fiber grating tracker and fault detection method of optical fiber circuit |
| CN103297127A (en) * | 2013-06-09 | 2013-09-11 | 索尔思光电（成都）有限公司 | Optical network unit (ONU) optical module |
| WO2017041224A1 (en) * | 2015-09-08 | 2017-03-16 | 华为技术有限公司 | Adjustable laser wavelength alignment method and device, and related apparatus and system |
| WO2017206371A1 (en) * | 2016-05-31 | 2017-12-07 | 中兴通讯股份有限公司 | Optical fiber network fault detection method, device, and system |
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