CN104202082B - A kind of high survivability PON protection structure of low overhead - Google Patents
A kind of high survivability PON protection structure of low overhead Download PDFInfo
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Abstract
The present invention relates to a kind of high survivability PON protection structure of low overhead, belong to optical-fiber network technical field.This structure is passed through new design logic in optical line terminal and is judged, multiple different functional units such as backs up transmitting-receiving and protect road to control; logic decision unit judges switching of photoswitch according to the logical signal receiving; backup Transmit-Receive Unit be tuned to faulty component protection wavelength; WDM part is made only faulty component device to be executed switching operation it is achieved that the centralized protection of low overhead；Adopt crossover bus shape structure in TDM part, ONU detects and achieves quick distributed protection during fault and switch.The present invention efficiently reduces the component counts that in WDM/TDM PON system, participation protective is switched, and reduces the coverage of fault, reduces the protection resource overhead of fault, and achieves full guard to fiber failure all of in whole system.
Description
Technical field
The invention belongs to optical-fiber network technical field, it is related to the wavelength-division multiplex time division multiplex hybrid passive of future generation in optical-fiber network
Optical-fiber network (WDM/TDM-PON) failure protection techniques, the high survivability PON protection structure of particularly a kind of low overhead.
Background technology
With the progress of expanding economy and science and technology, people grow with each passing day to the demand of various information, and this is to existing
The data carrying capabilities of network form unprecedented pressure, cause high bandwidth Large Copacity of future generation, low cost can smooth upgrade mixed
The proposition closing EPON WDM/TDM-PON becomes inexorable trend, accordingly, improves the survival ability of hybrid passive optical network
Most important.It is the guarantee that network can continue reliability service that error protection is recovered, and quick fault recovery can significantly carry
The reliability of high network, reduces the loss of data service, and the research of therefore WDM/TDM-PON failure protection techniques becomes mixing
The key of PON Study on survivability.
Resist technology is mainly started with from network structure design, and the configuration mode according to protection resource can be by traditional protection technologies
It is divided into backup protection, packet protection and looped network protection three class.Typical protection backup is four kinds of guarantors of ITU-T G983.1 suggestion
Protection structure, mainly by the backup of the network equipment or link is reached with the purpose of protection.Packet protection will two adjacent
ONU is interconnected with spare fibre and forms an ONU group, can save resources and realize the automatic mutual pretection switch between ONU.Looped network is protected
Shield refers to for all ONU/RN or part ONU/RN once to connect cyclization, controls the line number up and down on fault both sides by OLT
To realize service protection recovery according to switching of photoswitch in direction and ONU/RN.
The resist technology of PON can be divided into centralized and distributed by the difference according to control mode again.Centralized finger fault
Afterwards, pretection switch operation is completed by OLT centralized Control；After distributed finger fault, protection operation is dispersedly executed by RN or ONU.
Qiu Y et al. is in " Anovel survivable architecture for hybrid WDM/TDM passive optical
networks”【Optics Communications[J].,2014,312:52-56.】A kind of distributed protection structure is proposed,
In the protection ring of TDM part on the basis of a malfunction state, decrease the component number that participation protective is switched, but its
When DF breaks down, all DF are involved in pretection switch, still cause to protect the wasting of resources.Fan H et al. is in " Cost-
effective scalable and robust star-cross-bus PON architecture using a
centrally controlled hybrid restoration mechanism”【Optical Communicationsand
Networking[J].IEEE/OSA Journal of,2013,5(7):730-740.】A kind of centralized protection structure is proposed,
Setting backup Transmit-Receive Unit, adopts crossover bus shape structure in TDM part in the olt.When breaking down, single by backup transmitting-receiving
The protection tuning of unit achieves the local recovery of local fault, reduces the coverage of fault, but needs last one kilometer optical fiber
(LMF) participation protective is switched together, causes to protect the wasting of resources.ZhuM et al. is in " Asurvivable 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 protection is proposed
Switchover mechanism, in the olt adopt Digital Logic identifying unit, according to operating path and Protection path are carried out simultaneously monitor gained
Logical signal, control photoswitch to realize quick protective switch, network structure is simple and network element low cost, but needs during pretection switch
All of DF to participate in, the wasting of resources is big.Centralized protection requires OLT more complicated, but can other yuan of device of simplified system effectively
The structure of part, reduces cost expense；Distributed can effectively reduce fault incidence, improve pretection switch speed.
Therefore, in the protection structure of WDM/TDM-PON, the NE No. that is related to during how reducing pretection switch
Amount, reduces fault incidence, thus reducing the network protection wasting of resources, reducing the expense of protection, being the weight of Study on survivability
Point problem.
Content of the invention
In view of this, the present invention is directed to participation protective in traditional PON fiber failure to switch components and parts many, protects resource overhead
It is proposed that a kind of high survivability PON protection structure of low overhead, this structure newly devises many in optical line terminal big problem
Individual different functional unit, makes WDM part only faulty component device be executed switching operation it is achieved that the centralized guarantor of low overhead
Shield；In TDM part using crossover bus shape structure it is achieved that quick distributed protection is switched, effectively reduce fault
Coverage, reduces the protection resource overhead of fault.
For reaching above-mentioned purpose, the present invention provides following technical scheme：
Two parts of WDM/TDM-PON are adopted different protection sides by a kind of high survivability PON protection structure of low overhead
Formula, Part I is WDM part, and WDM part adopts tree-like backup architecture, is fallen by the quick protection of control realization intelligence of OLT
Change；Part II is TDM part, and TDM part adopts crossover bus shape structure, realizes quickly distributed self-insurance protective switching.
Further, the intelligent quick protective switch of described WDM part controls and specifically includes：Newly devise logic in the olt
Judge and backup Transmit-Receive Unit, and a kind of new functional unit protection road control unit；Unit in OLT is mutual
Connection communication is to realize WDM partly centralized pretection switch；Newly devise a power monitor in ONU, simultaneously using work
ONU is together in series by path and Protection path respectively, forms crossover bus shape structure, realizes fast distributed self-insurance protective switching.
Further, Transmit-Receive Unit monitors to the optical signal of operating path, logical signal is sent to logic simultaneously and sentences
Order unit and fault manage-ment cells；Power monitoring unit monitors to Protection path, and logical signal is sent to fault pipe
Reason unit；Fault manage-ment cells according to the logical signal receiving, notify backup Transmit-Receive Unit be tuned to corresponding wavelength realize
Protection；Logic decision unit, according to the logical signal receiving, controls two photoswitch OS to switch；Backup Transmit-Receive Unit is according to event
The output signal execution corresponding protection tuning of barrier administrative unit, and input a signal into 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 through OC
It is broadcast to each ONU respectively, upward signal is along same path reverse transfer；During WDM partial fault, logic decision unit according to
The logical signal receiving controls the state of OS1 and OS2, and fault manage-ment cells, according to the logical signal receiving, are intelligently controlled
Preparation part Transmit-Receive Unit be tuned on corresponding wavelength, pretection switch is realized by corresponding Protection path (FF* and DF-i*)；
Power prison it is only necessary to can achieve that self-shield is switched by the power monitor set up in ONU during TDM partial fault, in ONU
When visual organ can't detect downstream signal, produce logical signal and control the photoswitch OS in ONU to switch, and all of behind trouble point
ONU is voluntarily switched on Protection path.
Further, described logic decision unit is divided into two parts, and Part I controls the state of OS1, mainly non-is patrolled by N number of
Collect door and a N input is constituted with gate；Part II controls the state protecting OS2 in control unit, is a N input
NAND Logic door.
Further, described protection road control unit is made up of two parts, and one is OS2, controls from backup Transmit-Receive Unit
Whether the downstream signal coming passes through Protection path downlink transfer, and second is XOR device XOR, and XOR is according to the state of OS2
Control the state of OS2 with the output signal of logic decision unit Part II.
The beneficial effects of the present invention is：Hybrid protection structure proposed by the present invention, is provided with new function in the olt
Unit, it is achieved that only making faulty component device be switched in corresponding protection backup in WDM part, efficiently reduces fault
Coverage, reduces protection resource overhead；Adopt crossover bus shape structure in TDM part, and a work(is set in ONU
Rate monitor it is achieved that local fault is local recovers, the coverage of effective earth fault.The carried structure of the present invention can be to OLT
WDM part between ONU group provides descending 1:1 protection, up 1+1 protection；And provide descending 1 to the TDM part in ONU group
+ 1 protection, up 1:1 protection, can provide quick protective switch to the fiber failure of any one part.
Brief description
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below to carry out
Explanation：
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 internal basic block diagram of ONU.
Specific 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, and this structure adopts tree-like backup architecture in WDM part,
Newly devise the functional units such as logic decision, backup transmitting-receiving and the control of protection road in the olt, realize OLT centerized fusion and protect
Shield, simplifies RN and ONU effectively；TDM part adopts crossover bus shape structure, can reduce fault well using this structure
Coverage, realizes quickly distributed self-insurance protective switching.
In order to realize fully protective switching function, this structure newly devises logic decision and backup Transmit-Receive Unit in the olt, and
A kind of new functional unit protection road control unit is proposed.Unit in OLT is connected with each other communication to realize concentrating
Formula pretection switch.Wherein Transmit-Receive Unit monitors to the optical signal of operating path, logical signal is sent to logic simultaneously and sentences
Order unit and fault manage-ment cells；Power monitoring unit monitors to Protection path, and logical signal is sent to fault pipe
Reason unit；Fault manage-ment cells according to the logical signal receiving, notify backup Transmit-Receive Unit be tuned to corresponding wavelength realize
Protection；According to the logical signal receiving, (OS2 is located at the control of protection road to logic decision unit to control two photoswitches (OS) to switch
In unit processed)；Backup Transmit-Receive Unit is according to the output signal execution corresponding protection tuning of fault manage-ment cells and signal is defeated
Enter to protect road control unit it is clear that backup Transmit-Receive Unit can provide shared protection to all of transceiver；Protection road controls single
Unit controls OS2 to switch according to the output signal of logic decision unit and the state of OS2.The array waveguide grating adopting in structure
(AWG) all there is the free spectral range of identical (FSR).
In this structure, backup Transmit-Receive Unit institute be tuned to one (or multiple) protection wavelength, can be only by fault portion
Divide corresponding protection fiber-optic transfer.With respect to traditional error protection, carried structure does not need all of backup protection resource all
Participation protective is switched it is achieved that only faulty component is switched to the quick protection in corresponding protection backup, thus greatly saves
Save the expense of protection resource.
Transmit-Receive Unit includes N number of transceiver, light circulator and an AWG.N number of transceiver supports N number of ONU group, at each
In transceiver, emitter (Tx) produces downstream signal, and uplink and downlink signals are separated by light circulator.Receptor (Rx) is except in reception
Outside row signal, also the power of optical signal in working light path is monitored simultaneously, and send the corresponding signal of telecommunication to logic decision
Unit and fault manage-ment cells.Downstream signal is transmitted to the port 1 of 2 × 2 photoswitch OS1 by AWG after being multiplexed.Transmit-Receive Unit is basic
Structure chart such as Fig. 2.
Power monitoring unit includes N number of power monitor and an AWG, for monitoring each upward signal on Protection path
Power, and respectively produce the signal of telecommunication to fault manage-ment cells.Power monitoring unit basic block diagram such as Fig. 3.
Backup transceiver module includes m backup Transmit-Receive Unit PTRx, and PTRx includes tunable laser (TL), receptor
(Rx), tunable optic filter (TF), light circulator (Circulator).The downstream signal that backup Transmit-Receive Unit sends is through optical coupling
After device OC2 coupling, pass to protection road control unit.Upward signal the dividing through Circulator come from protection road control unit
From being transmitted to TF.Backup Transmit-Receive Unit quantity is m, and m can be the arbitrary integer between 1 to n in theory, but in fact m=n when
The survivability of network can be met, also ensure that efficient redundancy rate simultaneously, therefore m can be set to allow to break down simultaneously
The maximum number of ONU group.Backup Transmit-Receive Unit basic block diagram such as Fig. 4.
Protection road control unit includes 1 × 2 photoswitch OS2 and XOR device XOR, and XOR is according to OS2's
The output signal of state and logic decision unit controls OS2 to switch.The output signal of backup Transmit-Receive Unit is sent to the port of OS2
3, OS2 port 1 is connected to photo-coupler OC1, and the signal from OS1 and OS2 is coupled by OC1, by protecting optical fiber FF*
It is connected to the AWG in RN.Protection road control unit basic block diagram such as Fig. 5.
Logic decision unit is made up of two parts, the signal of telecommunication that in OLT, receptor (Rx) sends simultaneously to this two parts, its
Basic structure such as Fig. 6 shows.Part I L-1 includes N number of NOT logic door and a N input and gate, and Part II L-2 is one
Individual N inputs NAND Logic door.In logic decision unit, L-1 controls photoswitch OS1 (lateral connection or interconnection), and L-2 is controlled
Photoswitch OS2 (1-2 connects or 1-3 connects) processed.
When Rx and corresponding monitor all can't detect ascending power, show that corresponding ONU group integrally goes offline, this time
Switch OS2 is still switched, but fault manage-ment cells are according to the logical signal on the operating path and Protection path receiving,
Notify whether backup Transmit-Receive Unit executes protection tuning, now do not notify backup Transmit-Receive Unit to be adjusted to the ONU group that goes offline corresponding
Wavelength.Fig. 7 is the internal basic block diagram of ONU.
Specifically, the error protection principle of structure of the present invention：
Under normal mode of operation, downstream signal is only transmitted by operating path, OS1 lateral connection in OLT, and OS2 puts
In port 2 position, as shown in Figure 1.Downstream signal is divided into two parts through 2 × 2OC at each ONU group, is broadcast to each respectively
ONU.ONU is together in series with Protection path (dotted line in Fig. 1) and forms a similar annular by operating path (solid line in Fig. 1) respectively
Crossover bus shape structure, ONU only receiving data from working optical fibre under normal circumstances.On up direction, each upstream data leads to
Cross working optical fibre to be sent at 2 × 2OC, be divided into two parts, a part is sent to each in OLT by operating path and OS1
Rx, another part is passed to by Protection path and is further divided into two parts at 1 × 2OC1, and a part is sent to power monitoring unit, separately
A part is sent to backup Transmit-Receive Unit through OS2.
Fiber failure can be divided into following five kinds of situations to discuss.
Situation one：When FF breaks down.
Now OLT Transmit-Receive Unit can't detect the upward signal of all ONU groups, and all of Rx output is all logical signal
" 0 ", L-1 output logic signal " 1 ", control OS1 to be switched to cross-connection state, now whole network is switched on protection optical fiber
Transmission, realizes the recovery of data service, and backup Transmit-Receive Unit does not carry out protection tuning.
Situation two：When any one work DF breaks down.
Now, in Transmit-Receive Unit, corresponding Rx can't detect upward signal, produces logical signal " 0 " and arrives logic decision unit
And fault manage-ment cells.Meanwhile, monitor that the power monitor of same channel is able to detect that optical signal, produce logical signal " 1 "
To fault manage-ment cells.Fault manage-ment cells, according to the logical signal receiving, notify backup Transmit-Receive Unit to be adjusted to accordingly
On wavelength.
Through logical operationss output logic signal " 0 ", OS1 is not switched L-1；L-2 output logic signal is " 1 ", sends out
The port 2 of XOR toward in the control unit of protection road.The port 1 of XOR is connected on OS2, sends when OS2 switches on port 1 and patrols
Collect the port 1 that signal " 1 " arrives XOR, otherwise send " 0 ".The logical signal that now XOR port 1 receives is " 0 ", and therefore XOR is defeated
Go out logical signal " 1 " and be sent to OS2, OS2 is switched on port 1.Now backup Transmit-Receive Unit downstream signal can by OS2,
OC1 is sent to RN, then protects optical fiber DF* to be sent to corresponding faulted ONU group so that only faulty ONU group through corresponding
It is switched on corresponding protection optical fiber it is achieved that minimum living protects the fault recovery of expense.
Meanwhile, if other one or more (number of faults is less than m) work DF breaks down again, each unit execution is corresponding
Operation, only faulty ONU group is switched on corresponding protection optical fiber to remain able to realization.Now, L-1 output logic signal is
" 0 ", OS1 is not switched, and L-2 output logic signal is sent to the port 2 of XOR for " 1 ", and now OS2 is in port 1 shape
State, the logical signal being thus transmitted to XOR port 1 is " 1 ", and therefore XOR is output as logical signal " 0 ", and OS2 will be maintained at holding
In the state of mouth 1.At this moment, the protection data that backup Transmit-Receive Unit sends can be sent to RN node, only still can achieve after demultiplexing
It is that the ONU group of fault is switched in corresponding protection backup, realize the fault recovery of low overhead.
Situation three：When breaking down for two or a plurality of (number of faults is less than m) work DF simultaneously.
Recovering step now is similar with during single fault.In OLT Transmit-Receive Unit, multiple Rx do not receive signal, logic decision
Unit is corresponding to OS1 and OS2 execution to be controlled, and still can realize only faulty ONU group and be switched to corresponding protection backup
On, realize the fault recovery of low overhead.
Now other if one or more of (number of faults is less than m) work DF breaks down, each unit execution is corresponding
Operation, remain able to realize only faulty ONU group be switched on corresponding protection optical fiber, its process and class described in situation two
Seemingly.
Situation four：When the DF number of simultaneous faults is more than m.
When fault manage-ment cells detect fault DF number and are more than m, fault manage-ment cells directly transmit logical signal " 1 " and arrive
OS1, controls OS1 to be switched to crossing condition, and backup Transmit-Receive Unit does not carry out protection tuning.
In OLT, logic decision unit Part I L-1 logical expression is：
The logical expression of Part II L-2 is：
wj, j=1,2L n is the logical signal that in OLT, each receptor sends.
The expression formula of XOR device XOR is：
S represents the output signal of XOR, SL2Represent the output signal of logic decision unit Part II, SOS21Represent that OS2 is
No connection is on port 1.
Situation five：When LMF breaks down.
ONU basic structure is as shown in Figure 7.Three bonder Tap, a power monitor, Photoelectric Detection is included inside ONU
Device PD, reflective semiconductor optical amplifier (RSOA).In operating path, signal transmits in the direction of the clock, and signal is divided by Tap 1
For two parts, a part passes to PD by Tap 3, and another part continues transmission under clockwise direction.Up direction, RSOA will be descending
DATA remodulation is beamed back Tap 3 and is divided into two parts, and the upward signal of ONU is coupled into upstream wavelength at Tap 1 by a part
Middle counterclockwise transmission, another part passes to OS.Power monitor, according to the output signal of PD, controls switching of OS.
When LMF breaks down, PD does not receive downstream signal, and power monitor M sends a logical signal controlling switch
OS switches, and at this moment ONU will be switched to protection optical fiber LMF* and realize data recovery, and behind trouble point, all of ONU will voluntarily be switched to
According to clockwise direction transmission upward signal on protection optical fiber, realize the recovery of data service.
Finally illustrate, preferred embodiment above only in order to technical scheme to be described and unrestricted, although logical
Cross above preferred embodiment the present invention to be described in detail, it is to be understood by those skilled in the art that can be
In form and various changes are made to it, without departing from claims of the present invention limited range in details.
Claims (4)
1. a kind of low overhead high survivability PON protection structure it is characterised in that：Two parts of WDM/TDM-PON are adopted not
Same protected mode, Part I is WDM part, and WDM part adopts tree-like backup architecture, by the control realization intelligence of OLT
Quick protective switch；Part II is TDM part, and TDM part adopts crossover bus shape structure, realizes quickly distributed self-insurance
Protective switching；
The intelligent quick protective switch control of described WDM part specifically includes：Newly devise logic decision in the olt and backup is received
Bill unit, and protection road control unit, described protection road control unit is according to the output signal of logic decision unit and OS2
State control OS2 switch；Unit in OLT is connected with each other communication to realize WDM partly centralized pretection switch；?
ONU newly devises a power monitor, respectively ONU is together in series using operating path and Protection path simultaneously, is formed and hands over
Fork busbar network, realizes fast distributed self-insurance protective switching；
Transmit-Receive Unit monitors to the optical signal of operating path, logical signal is sent to logic decision unit and fault simultaneously
Administrative unit；Power monitoring unit monitors to Protection path, and logical signal is sent to fault manage-ment cells；Fault pipe
Reason unit according to the logical signal receiving, notify backup Transmit-Receive Unit be tuned to corresponding wavelength realize protecting；Logic decision
Unit, according to the logical signal receiving, controls two photoswitch OS to switch；Backup Transmit-Receive Unit is according to fault manage-ment cells
Output signal execution corresponding protection tuning, and input a signal into protection road control unit.
2. a kind of low overhead according to claim 1 high survivability PON protection structure it is characterised in that：Normal work
Under pattern, downstream signal is transferred to ONU group by working optical fibre FF and DF-i, is divided into two parts to broadcast respectively through photo-coupler OC
To each ONU, upward signal is along same path reverse transfer；During WDM partial fault, logic decision unit is according to receiving
Logical signal controls the state of OS1 and OS2, and fault manage-ment cells, according to the logical signal receiving, intelligently control backup to receive
Bill unit be tuned on corresponding wavelength, by corresponding Protection path：FF* and DF-i*, realizes pretection switch；TDM partly event
Power monitor detection it is only necessary to can achieve that self-shield is switched by the power monitor set up in ONU during barrier, in ONU
During less than downstream signal, produce logical signal and control the photoswitch OS in ONU to switch, and behind trouble point all of ONU is voluntarily
It is switched on Protection path.
3. a kind of low overhead according to claim 1 high survivability PON protection structure it is characterised in that：Described logic
Identifying unit is divided into two parts, and Part I controls the state of OS1, mainly by N number of NOT logic door and a N input and gate
Constitute；Part II controls the state of OS2 in the control unit of protection road, is a N input NAND Logic door.
4. a kind of low overhead according to claim 1 high survivability PON protection structure it is characterised in that：Described protection
Road control unit is made up of two parts, and one is OS2, controls from whether the downstream signal of backup Transmit-Receive Unit passes through protection
Path downlink transfer, second is XOR device XOR, and XOR is according to the state of OS2 and logic decision unit Part II
Output signal controls the state of OS2.
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| CN106160840B (en) * | 2015-04-08 | 2019-01-18 | 东南大学 | Wave division multiplexing passive optical network optical fiber link distributed protection device and its guard method |
| CN104836624A (en) * | 2015-04-17 | 2015-08-12 | 东南大学 | Centralized protection passive optical network system based on optical carrier suppression technology |
| CN106131715B (en) * | 2016-07-12 | 2019-07-26 | 重庆邮电大学 | A kind of expansible low overhead TWDM-PON all-fiber protection structure |
| WO2020107481A1 (en) * | 2018-11-30 | 2020-06-04 | 华为技术有限公司 | Pon fault location method and device |
| 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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