CN104202082A - Low-expense high-survivability PON protection structure - Google Patents
Low-expense high-survivability PON protection structure Download PDFInfo
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- CN104202082A CN104202082A CN201410498187.2A CN201410498187A CN104202082A CN 104202082 A CN104202082 A CN 104202082A CN 201410498187 A CN201410498187 A CN 201410498187A CN 104202082 A CN104202082 A CN 104202082A
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Abstract
The invention relates to a low-expense high-survivability PON protection structure, and belongs to the technical field of optical networks. A plurality of different functional units of logic decision, backup transmitting-receiving, protection path control, and the like are additionally arranged in an optical line terminal; the switching of an optical switch is confirmed by the logic decision unit according to received logic signals; protection wavelength of a faulty component is tuned by the backup transmit-receive unit to enable a WDM part to conduct switching operation just on the faulty component to realize low expense concentrated protection; a cross concentration line structure is adopted at a TDM part; quick distributed protection switching is realized when ONU detects fault. According to the invention, the number of components participating in the protection switching in the WDM/TDM-PON system is effectively decreased; influence range of the fault is reduced; protection resource expense on the fault is reduced; full protection to all optical fiber fault in the whole system is realized.
Description
Technical field
The invention belongs to optical-fiber network technical field, relate to the high survivability PON protection structure of wavelength division multiplexing time division multiplexing hybrid passive optical network of future generation (WDM/TDM-PON) error protection technology, particularly a kind of low expense in optical-fiber network.
Background technology
Along with expanding economy and scientific and technical progress, people grow with each passing day to the demand of various information, this Deta bearer ability to existing network forms unprecedented pressure, cause the proposition of the hybrid passive optical network WDM/TDM-PON that the roomy capacity of high-band of future generation, low cost can smooth upgrade to become inexorable trend, accordingly, the survival ability of raising hybrid passive optical network is most important.It is the guarantee that network can continue reliability service that error protection is recovered; fault recovery fast can improve the reliability of network significantly; reduce the loss of data service, so the research of WDM/TDM-PON error protection technology becomes the key of mixing PON Study on survivability.
Resist technology is mainly started with from network configuration design, traditional protection technologies can be divided into backup protection, packet protection and looped network protection three classes according to the configuration mode of reserved resource.Four kinds of protection structures that typical protection backup is ITU-TG983.1 suggestion, main by the backup of the network equipment or link being reached to the object of protection.Packet protection is about to two ONU groups of the interconnected formation of standby optical fiber adjacent ONU for, can saving resource and the automatic mutual protection of realizing between ONU switch.Looped network protection refers to all ONU/RN or part ONU/RN once connected into ring, by OLT control optical switch in the up-downgoing data direction on fault both sides and ONU/RN switch realize service protection and recover.
According to the difference of control mode, the resist technology of PON can be divided into again centralized and distributed.After centralized finger fault, protection switching operation is completed by OLT centralized control; After distributed finger fault, by RN or ONU, carry out dispersedly protection operation.The people such as Qiu Y are at " A novel survivable architecture for hybrid WDM/TDM passive optical networks " [Optics Communications[J].; 2014; 312:52-56.] a kind of distributed protection structure proposed; the malfunction of take in the guard ring of TDM part is normal condition; reduced the component number that participation protective is switched; but when its DF breaks down, all DF participation protective switch, still cause reserved resource waste.The people such as FanH are at " Cost-effective scalable and robust star-cross-bus PON architecture using a centrally controlled hybrid restoration mechanism " [Optical Communications and Networking[J] .IEEE/OSA Journal of; 2013; 5 (7): 730-740.] a kind of centralized protection structure is proposed; backup Transmit-Receive Unit is set in OLT, at TDM, partly adopts crossover bus shape structure.While breaking down, protection by backup Transmit-Receive Unit is tuning has realized that local fault is local to be recovered, and has reduced the coverage of fault, but need last kilometer of optical fiber (LMF) together participation protective switch, cause reserved resource waste.The people such as ZhuM are at " A survivable colorless wavelength division multiplexed passive optical network with centrally controlled intelligent protection scheme " [Optical Communications and Networking[J] .IEEE/OSA Journal of, 2012, 4 (10): 741-748.] a kind of centralized intelligence wrap protection is proposed, in OLT, adopt Digital Logic identifying unit, according to operating path and Protection path are monitored the logical signal of gained simultaneously, control optical switch and realize quick protective switch, network configuration is simple and network element cost is low, but when switching, protection need all DF to participate in, the wasting of resources is large.Centralized protection requires OLT more complicated, but can effectively simplify the structure of other components and parts of system, reduces costs expense; Distributedly can effectively reduce fault incidence, improve protection and switch speed.
Therefore, in the protection structure of WDM/TDM-PON, how reducing the NE quantity relating in protection reversed process, reduce fault incidence, thereby reduce the network protection wasting of resources, reduce the expense of protection, is the Important Problems of Study on survivability.
Summary of the invention
In view of this, the present invention is directed in conventional P ON fiber failure participation protective, to switch components and parts many, the problem that reserved resource expense is large, a kind of high survivability PON protection structure of low expense has been proposed, this structure has newly designed a plurality of different functional units in optical line terminal, make WDM part only faulty component device be carried out to switching operation, realized the centralized protection of low expense; At TDM, partly adopt crossover bus shape structure, realized distributed protection fast and switched, effectively reduced the coverage of fault, reduced the reserved resource expense of fault.
For achieving the above object, the invention provides following technical scheme:
A high survivability PON protection structure for low expense, adopts different protected modes to two parts of WDM/TDM-PON, and first is WDM part, and WDM partly adopts tree-like backup architecture, and the control by OLT realizes intelligent quick protective switch; Second portion is TDM part, and TDM partly adopts crossover bus shape structure, realizes distributed self-shield fast and switches.
Further, the intelligent quick protective switch of described WDM part is controlled and is specifically comprised: in OLT, newly designed logic decision and backup Transmit-Receive Unit, and a kind of new functional unit---protection road control unit; Unit in OLT interconnects communication and switches to realize the protection of WDM segment set Chinese style; At ONU, newly designed a power monitor, used operating path and Protection path respectively ONU to be together in series simultaneously, formed crossover bus shape structure, realized fast distributed self-shield and switch.
Further, Transmit-Receive Unit monitors the light signal of operating path, logical signal is sent to logic decision unit and fault manage-ment cells simultaneously; Power-monitoring unit monitors Protection path, and logical signal is sent to fault manage-ment cells; Fault manage-ment cells is according to the logical signal that receives, notice backup Transmit-Receive Unit be tuned to corresponding wavelength realize protection; Logic decision unit, according to the logical signal receiving, is controlled two optical switch OS and is switched; It is tuning that backup Transmit-Receive Unit is carried out corresponding protection according to the output signal of fault manage-ment cells, and by signal input protection road control unit.
Further, under normal mode of operation, downstream signal is transferred to ONU group by FF and DF-i, is divided into two parts is broadcast to respectively each ONU through OC, and upward signal is along same path reverse transfer; During WDM partial fault, the state of OS1 and OS2 is controlled in logic decision unit according to the logical signal receiving, fault manage-ment cells is according to the logical signal receiving, control intelligently backup Transmit-Receive Unit be tuned on corresponding wavelength, by corresponding Protection path (FF* and DF-i*), realize protection and switch; During TDM partial fault; only needing power monitor by setting up in ONU can realize self-shield switches; when the power monitor in ONU can't detect downstream signal, the optical switch OS producing in logical signal control ONU switches, and behind fault point, all ONU are switched on Protection path voluntarily.
Further, described logic decision unit is divided into two parts, and first controls the state of OS1, mainly N NOT logic door and a N input, consists of with gate; Second portion is controlled and has been protected the state of OS2 in control unit, is a N input NAND Logic door.
Further; described protection road control unit consists of two parts; one is OS2; whether control passes through Protection path downlink transfer from the downstream signal of backup Transmit-Receive Unit; second is XOR device XOR, and XOR controls the state of OS2 according to the output signal of the state of OS2 and logic decision unit second portion.
Beneficial effect of the present invention is: the hybrid protection structure that the present invention proposes, in OLT, be provided with new functional unit, realized in WDM part and only made faulty component device be switched in corresponding protection backup, effectively reduced fault incidence, reduced reserved resource expense; At TDM, partly adopt crossover bus shape structure, and a power monitor is set in ONU, realized the local recovery of local fault, effectively the coverage of fault.Structure that the present invention carries can partly provide descending 1:1 protection, up 1+1 protection to the WDM between ONU group to OLT; And partly providing descending 1+1 protection to the TDM in ONU group, up 1:1 protection, can provide quick protective switch to the fiber failure of any one part.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearer, the invention provides following accompanying drawing and describe:
Fig. 1 is the overall construction drawing of protection structure of the present invention;
Fig. 2 is Transmit-Receive Unit basic block diagram;
Fig. 3 is power-monitoring unit basic block diagram;
Fig. 4 is backup Transmit-Receive Unit basic block diagram;
Fig. 5 is protection road control unit basic block diagram;
Fig. 6 is logic decision unit basic block diagram;
Fig. 7 is the inner basic block diagram of ONU.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the overall construction drawing of protection structure of the present invention, this structure partly adopts tree-like backup architecture at WDM, in OLT, newly design the functional units such as logic decision, backup transmitting-receiving and protection road control, realized the centralized control protection of OLT, effectively simplified RN and ONU; TDM partly adopts crossover bus shape structure, utilizes this structure can reduce well fault incidence, realizes distributed self-shield fast and switches.
In order to realize fully protective switching function, this structure has newly designed logic decision and backup Transmit-Receive Unit in OLT, and proposes a kind of new functional unit---protection road control unit.Unit in OLT interconnects communication and switches to realize centralized protection.Wherein Transmit-Receive Unit monitors the light signal of operating path, logical signal is sent to logic decision unit and fault manage-ment cells simultaneously; Power-monitoring unit monitors Protection path, and logical signal is sent to fault manage-ment cells; Fault manage-ment cells is according to the logical signal that receives, notice backup Transmit-Receive Unit be tuned to corresponding wavelength realize protection; Logic decision unit, according to the logical signal receiving, is controlled two optical switches (OS) and is switched (OS2 is arranged in protection road control unit); It is tuning that backup Transmit-Receive Unit is carried out corresponding protection according to the output signal of fault manage-ment cells, and by signal input protection road control unit, obviously back up Transmit-Receive Unit and can provide share protect to all transceivers; Protection road control unit is controlled OS2 according to the state of the output signal of logic decision unit and OS2 and is switched.The array waveguide grating adopting in structure (AWG) all has identical free spectral range (FSR).
In this structure, backup Transmit-Receive Unit institute be tuned to one (or a plurality of) protection wavelength, can only pass through protection Optical Fiber Transmission corresponding to faulty component.With respect to traditional error protection, the structure of carrying do not need all backup protection resources all participation protective switch, realized and only had faulty component to be switched to the quick protection in corresponding protection backup, thereby greatly saved the expense of reserved resource.
Transmit-Receive Unit comprises N transceiver, light circulator and an AWG.N transceiver supported N ONU group, and in each transceiver, reflector (Tx) produces downstream signal, and light circulator says that uplink and downlink signals is separated.Receiver (Rx) except receiving upward signal, also monitors the power of light signal in working light path simultaneously, and sends the corresponding signal of telecommunication to logic decision unit and fault manage-ment cells.After downstream signal is multiplexing by AWG, be transmitted to the port one of 2 * 2 optical switch OS1.Transmit-Receive Unit basic block diagram is as Fig. 2.
Power-monitoring unit comprises N power monitor and an AWG, is used for monitoring the power of each upward signal on Protection path, and produces respectively the signal of telecommunication to fault manage-ment cells.Power-monitoring unit basic block diagram is as Fig. 3.
Backup transceiver module comprises m backup Transmit-Receive Unit PTRx, and PTRx comprises tunable laser (TL), receiver (Rx), tunable optic filter (TF), light circulator (Circulator).The downstream signal that backup Transmit-Receive Unit sends, after optical coupler OC2 coupling, passes to protection road control unit.The upward signal coming from protection road control unit, through the separation of Circulator, is transmitted to TF.Backup Transmit-Receive Unit quantity is m, m can be the arbitrary integer between 1 to n in theory, but in fact can meet the survivability of network during m < < n, simultaneously can also guarantee efficient redundancy rate, so m can be made as the maximum number that allows the ONU group that simultaneously breaks down.Backup Transmit-Receive Unit basic block diagram is as Fig. 4.
Protection road control unit comprises 1 * 2 optical switch OS2 and an XOR device XOR, and XOR controls OS2 according to the output signal of the state of OS2 and logic decision unit and switches.The output signal of backup Transmit-Receive Unit sends to the port 3 of OS2, and the port one of OS2 is connected to optical coupler OC1, and OC1 is coupled the signal from OS1 and OS2, and by protection optical fiber, FF* is connected to the AWG in RN.Protection road control unit basic block diagram is as Fig. 5.
Logic decision unit is comprised of two parts, and the signal of telecommunication that receiver in OLT (Rx) sends is simultaneously to these two parts, and its basic structure is shown as Fig. 6.The L-1 of first comprises that N NOT logic door and a N input and gate, and second portion L-2 is a N input NAND Logic door.In logic decision unit, L-1 controls optical switch OS1 (laterally connecting or interconnection), and L-2 controls optical switch OS2 (1-2 connects or 1-3 connects).
When Rx can't detect ascending power with corresponding monitor; show that corresponding ONU group integral body goes offline; now optical switch OS2 still switches; but fault manage-ment cells is according to the operating path receiving and the logical signal on Protection path; it is tuning whether notice backup Transmit-Receive Unit carries out protection, now do not notify backup Transmit-Receive Unit to be adjusted to the ONU that goes offline and organize corresponding wavelength.Fig. 7 is the inner basic block diagram of ONU.
Specifically, the error protection principle of structure of the present invention:
Under normal mode of operation, downstream signal only transmits by operating path, and in OLT, OS1 laterally connects, and OS2 is placed in port 2 positions, as shown in Figure 1.Downstream signal is divided into two parts at each ONU group 2 * 2OC of place, is broadcast to respectively each ONU.Operating path (solid line in Fig. 1) and Protection path (dotted line in Fig. 1) are together in series ONU respectively and form the crossover bus shape structure of a similar annular, and ONU only receives data from working optical fibre under normal circumstances.On up direction; each upstream data sends to 2 * 2OC place by working optical fibre; be divided into two parts; a part sends to each Rx in OLT by operating path and OS1; another part passes to 1 * 2OC1 place by Protection path and is further divided into two parts; a part sends to power-monitoring unit, and another part mails to backup Transmit-Receive Unit through OS2.
Fiber failure can be divided into following five kinds of situations and discuss.
Situation one: when FF breaks down.
Now OLT Transmit-Receive Unit can't detect the upward signal of all ONU groups; all Rx outputs are all logical signal " 0 "; L-1 output logic signal " 1 "; control OS1 and be switched to interconnection state; now whole network is switched on protection optical fiber and transmits; realize the recovery of data service, and backup Transmit-Receive Unit is not protected tuning.
Situation two: when any work DF breaks down.
Now, in Transmit-Receive Unit, corresponding Rx can't detect upward signal, produces logical signal " 0 " to logic decision unit and fault manage-ment cells.Meanwhile, monitor that the power monitor of same channel can detect light signal, produce logical signal " 1 " to fault manage-ment cells.Fault manage-ment cells is according to the logical signal receiving, and notice backup Transmit-Receive Unit is adjusted on corresponding wavelength.
L-1 is through logical operation output logic signal " 0 ", and OS1 does not switch; L-2 output logic signal is " 1 ", mails to the port 2 of XOR in the control unit of protection road.It is upper that the port one of XOR is connected to OS2, sends logical signal " 1 " to the port one of XOR when OS2 switches on port one, otherwise send " 0 ".The logical signal that now XOR port one receives is " 0 ", so XOR output logic signal " 1 " sends to OS2, and OS2 is switched on port one.The downstream signal that now backs up Transmit-Receive Unit can send to RN by OS2, OC1; through corresponding protection optical fiber DF*, send to corresponding faulted ONU group again; only out of order ONU group is switched on corresponding protection optical fiber, has realized the fault recovery of low protection expense.
Meanwhile, if other one or more (number of faults is less than m) work DF breaks down again, corresponding operation is carried out in each unit, still can realize only out of order ONU group and be switched on corresponding protection optical fiber.Now, L-1 output logic signal is " 0 ", OS1 does not switch, L-2 output logic signal is the port 2 that " 1 " sends to XOR, and now OS2 in port one state, therefore the logical signal that sends to XOR port one is " 1 ", so XOR is output as logical signal " 0 ", and OS2 will maintain on the state of port one.At this moment, the protected data that backup Transmit-Receive Unit sends can send to RN node, still can realize the just ONU group of fault and be switched to corresponding protection backup above after demultiplexing, realizes the fault recovery of low expense.
Situation three: when two or many (number of faults is less than m) work DF breaks down simultaneously.
Similar when recovering step now and single fault.In OLT Transmit-Receive Unit, a plurality of Rx do not receive signal, and corresponding control carried out to OS1 and OS2 in logic decision unit, still can realize only out of order ONU group and be switched to corresponding protection backup above, realize the fault recovery of low expense.
If now other one or more of (number of faults is less than m) work DF is when break down, corresponding operation is carried out in each unit, still can realize only out of order ONU group and be switched on corresponding protection optical fiber, similar described in its process and situation two.
Situation four: when the DF of simultaneous faults number is greater than m.
When fault manage-ment cells detects fault DF number and is greater than m, fault manage-ment cells directly sends logical signal " 1 " to OS1, controls OS1 and is switched to crossing condition (for avoiding mixed and disorderly, not drawing in Fig. 2), and back up Transmit-Receive Unit and do not protect tuning.
In OLT, the logic decision unit L-1 of first logical expression is:
The logical expression of second portion L-2 is:
W
j, j=1,2 ... n is the logical signal that in OLT, each receiver sends.
The expression formula of XOR device XOR is:
S represents the output signal of XOR, S
l2the output signal of presentation logic identifying unit second portion, S
oS21represent whether OS2 is connected on port one.
Situation five: when LMF breaks down.
ONU basic structure as shown in Figure 6.ONU inside comprises three coupler Tap, a power monitor, photoelectric detector PD, reflective semiconductor optical amplifier (RSOA).In operating path, signal transmits in the direction of the clock, and Tap1 is divided into two parts by signal, and a part passes to PD by Tap3, and another part continues to transmit under clockwise direction.Up direction, RSOA beams back downlink data remodulates Tap3 and is divided into two parts, and a part is transmission counterclockwise in Tap1 place is coupled into up wavelength by the upward signal of ONU, and another part passes to OS.Power monitor, according to the output signal of PD, is controlled switching of OS.
When LMF breaks down; PD does not receive downstream signal; power monitor M sends a logical signal control switch OS and switches; at this moment ONU will be switched to protection optical fiber LMF* and realize data recovery; behind fault point, all ONU will be switched to voluntarily on protection optical fiber and transmit upward signal according to clockwise direction, realize the recovery of data service.
Finally explanation is, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can to it, make various changes in the form and details, and not depart from the claims in the present invention book limited range.
Claims (6)
1. the high survivability PON of a low expense protects structure, it is characterized in that: two parts of WDM/TDM-PON are adopted to different protected modes, first is WDM part, and WDM partly adopts tree-like backup architecture, and the control by OLT realizes intelligent quick protective switch; Second portion is TDM part, and TDM partly adopts crossover bus shape structure, realizes distributed self-shield fast and switches.
2. the high survivability PON of a kind of low expense according to claim 1 protects structure, it is characterized in that: the intelligent quick protective switch of described WDM part is controlled and specifically comprised: in OLT, newly designed logic decision and backup Transmit-Receive Unit, and a kind of new functional unit---protection road control unit; Unit in OLT interconnects communication and switches to realize the protection of WDM segment set Chinese style; At ONU, newly designed a power monitor, used operating path and Protection path respectively ONU to be together in series simultaneously, formed crossover bus shape structure, realized fast distributed self-shield and switch.
3. the high survivability PON of a kind of low expense according to claim 2 protection structure, is characterized in that: Transmit-Receive Unit monitors the light signal of operating path, logical signal is sent to logic decision unit and fault manage-ment cells simultaneously; Power-monitoring unit monitors Protection path, and logical signal is sent to fault manage-ment cells; Fault manage-ment cells is according to the logical signal that receives, notice backup Transmit-Receive Unit be tuned to corresponding wavelength realize protection; Logic decision unit, according to the logical signal receiving, is controlled two optical switch OS and is switched; It is tuning that backup Transmit-Receive Unit is carried out corresponding protection according to the output signal of fault manage-ment cells, and by signal input protection road control unit.
4. the high survivability PON of a kind of low expense according to claim 3 protects structure, it is characterized in that: under normal mode of operation, downstream signal is transferred to ONU group by FF and DF-i, is divided into two parts is broadcast to respectively each ONU through OC, and upward signal is along same path reverse transfer; During WDM partial fault, the state of OS1 and OS2 is controlled in logic decision unit according to the logical signal receiving, fault manage-ment cells is according to the logical signal receiving, control intelligently backup Transmit-Receive Unit be tuned on corresponding wavelength, by corresponding Protection path (FF* and DF-i*), realize protection and switch; During TDM partial fault; only needing power monitor by setting up in ONU can realize self-shield switches; when the power monitor in ONU can't detect downstream signal, the optical switch OS producing in logical signal control ONU switches, and behind fault point, all ONU are switched on Protection path voluntarily.
5. the high survivability PON of a kind of low expense according to claim 3 protection structure, is characterized in that: described logic decision unit is divided into two parts, and first controls the state of OS1, mainly N NOT logic door and a N input, consists of with gate; Second portion is controlled and has been protected the state of OS2 in control unit, is a N input NAND Logic door.
6. the high survivability PON of a kind of low expense according to claim 3 protects structure; it is characterized in that: described protection road control unit consists of two parts; one is OS2; whether control passes through Protection path downlink transfer from the downstream signal of backup Transmit-Receive Unit; second is XOR device XOR, and XOR controls the state of OS2 according to the output signal of the state of OS2 and logic decision unit second portion.
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| CN112567647A (en) * | 2018-11-30 | 2021-03-26 | 华为技术有限公司 | PON fault positioning method and device |
| CN112567647B (en) * | 2018-11-30 | 2022-07-22 | 华为技术有限公司 | PON fault positioning method and device |
| CN114039834A (en) * | 2021-11-03 | 2022-02-11 | 中盈优创资讯科技有限公司 | Processing method and device for realizing one-key diagnosis of end-to-end faults of optical network |
| CN114039834B (en) * | 2021-11-03 | 2024-01-05 | 中盈优创资讯科技有限公司 | Processing method and device for realizing one-key diagnosis of end-to-end faults of optical network |
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