CN106936494B - A kind of passive optical network protection system and its apparatus - Google Patents
A kind of passive optical network protection system and its apparatus Download PDFInfo
- Publication number
- CN106936494B CN106936494B CN201511008612.6A CN201511008612A CN106936494B CN 106936494 B CN106936494 B CN 106936494B CN 201511008612 A CN201511008612 A CN 201511008612A CN 106936494 B CN106936494 B CN 106936494B
- Authority
- CN
- China
- Prior art keywords
- optical
- wavelength
- optical fiber
- onu
- backup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
Abstract
The present invention provides a kind of passive optical network, local side unit includes several optical line terminal OLTs, is sent to ODN network by the downlink optical signal of protection wavelength channel by respective feeder fiber or receives the uplink optical signal from user side ONU；Optical power fluctuation unit, input port are connected with aforementioned several fibre circuit unit OLT respectively by several feeder fibers, and output port passes through introducing optical fiber respectively and is connected with the ONU of user side；Optical network unit has link protection device, and for coupling other ONU, the introducing optical fiber for keeping the ONU being coupled connected can be used as the backup that the optical network unit introduces optical fiber.Wherein, it is configured and is exported with complementary type by protection downstream wavelength in downlink optical signal; the system can provide a flexible wireless front end passback MFH based on existing Optical Distribution Network for Radio Access Network and comprehensively protect system, in particular so that ONU close to each other, which introduces optical fiber, can provide mutual backup.
Description
Technical field
The present invention relates in field of communication technology access system more particularly to a kind of passive optical network (PON) protection system
The wireless front end passed-back traffic of system and its device and the system in Radio Access Network protects application.
Background technique
With continuing to bring out for all kinds of new opplications, wireless traffic is persistently increased rapidly.Cloud Radio Access Network (C-RAN)
The characteristics of can reduce cost, simplified network structure and shared resource because of it, is considered as a kind of very popular framework, uses
To meet growing business demand.In this distributed radio access networks (RAN) framework, base station (BS) function is divided
From for two parts: primary radio component is located at remote radio unit (RRU) (RRH), and processing and control function are located at baseband processing unit
(BBU).Part between the BBU and distal end RRH of centralization is referred to as wireless front end passback (MFH), is the pass in C-RAN framework
Key section.The low delay character considered and itself has due to the coincidence of geographical coverage area, economically, wavelength-division multiplex without
Source optical-fiber network (WDM-PON) is considered as a kind of framework for being very suitable to carrying MFH.
Front end, which communicates back, is typically based on common public radio interface (CPRI) technology, transmits number by binary bit stream
Word baseband signal.However, the bandwidth utilization efficiency of CPRI technology is not high.Such as: be 20MHz for single wireless signal-path band width,
8*8 needs the front end return data rate of up to 10Gb/s mostly into the typical scene for having more (MIMO).And it is fixed for 3GPP standard
The 4 of justice+G base station deployment, it may be assumed that 3 RRH of every base station deployment (corresponding 3 sectors), single carrier 20MHz, the polymerization of 5 carrier waves, 8*8MIMO
Deployment scenario, the one way front end return data rate of every base station is up to 150Gb/s.
To avoid excessively high front end from returning rate, it is thus proposed that using including frequency conversion, radio frequency RF power synthesis/fractionation
Etc. analog signal processing mode including technologies, multiple wireless channels are converged on the same optical wavelength and are transmitted by it.Each
Optical wavelength carries 60 subcarriers, and each subcarrier carries a 20MHz bandwidth, 64 ary quadrature amplitudes (64-QAM)
LTE orthogonal frequency division multiplexing (OFDM) signal.Still with aforementioned 4+For G base station deployment scene, using technique, every base station institute
Need carrying wavelength number by from use 30 optical wavelengths (Single wavelength 10Gb/s) of CPRI technology be reduced to 4 wavelength (on
2 wavelength of row, 2 wavelength of downlink).Fig. 1 shows the PON network system tray of analog signal convergence technology carrying wireless front end passed-back traffic
Structure, for the sake of simplicity, here with 2 RRH of each base station deployment, and be illustrated by taking 2 base stations, one way business as an example, in legend,
The digital baseband signal that the baseband processing unit BBU1 of one base station is generated carries out channel by polymerization/split cells and converges it
Afterwards, respectively by digital-to-analogue conversion in the port OLT 1,2, light modulation, be loaded into downlink light wave wavelength X 1, export on λ 2, and
The digital baseband signal that another base station baseband processing unit BBU2 is generated carries out channel convergence by polymerization/split cells
Later, pass through the port 3 optical line terminal (OLT) respectively, 4 digital-to-analogue conversions, light modulation, be loaded into downlink light wave wavelength X 3, λ
It is exported on 4, above-mentioned optical wavelength is multiplexed into Optical Distribution Network (ODN) by wavelength division multiplexer (WDM) and is transmitted to each optical-fiber network list
First (ONU), wherein ONU1-1, ONU1-2 in cellular cell 1 select optical wavelength λ 1, λ 2 to receive at its base band respectively
The downlink signal of unit B BU is managed, such as: the wavelength selection system in ONU1-1 selects optical wavelength λ 1, is connect by receiving unit Rx
It receives the downlink optical signal from its BBU1 carried on λ 1, analog-digital converter ADC and downstream analog signal is converted into digital signal,
After each channel being split by polymerization/split cells, then analog signal is converted to by analog-digital converter DAC, and through up-conversion,
It is transferred to corresponding remote radio unit (RRU) RRH.Similarly, ONU2-1, ONU2-2 in cellular cell 2 select optical wavelength respectively
λ 3, λ 4 receive the downlink data from its BBU2.On the contrary, up direction passes through respective uplink linght from the backhaul data of each RRH
Wave wavelength is sent to OLT (not illustrating in legend) in an analog fashion.Due to high bandwidth utilization efficiency, this modeling scheme
It has obtained more and more paying close attention to from equipment vendor, operator and standardization body.
When PON system serves domestic consumer, network protection usually only be used as an optional mechanism, whether use according to
Rely when actual deployment considering economically.However, when PON is used for the carrying of front end passed-back traffic, due to more wireless channels
Convergence and centralization BBUs processing, it is necessary to use full redundancy mechanism, cause to avoid because of optical fiber cable or equipment fault
The service disconnection of thousands of users.
Three kinds of protection mechanism types: type A are defined in PON standard: only backing up feeder fiber, and feeder fiber, which refers to, to be located at
Fiber section between OLT and luminous-power distributor (SPL), to be protected to longest this section of optical path of distance after multiplex.Class
Type B: while the feeder fiber for backing up OLT and being connected.Type C: entire PON system, including OLT, ODN and ONU are backed up.
For economic considerations, usual PON system can be using type A or the protection architecture of type B.Not to introducing optical fiber
It is backed up, introduces optical fiber and refer to the fiber section between SPL and ONU.Due to occurring in the failure shadow for introducing fiber segment
Minority domestic consumer is rung, therefore introducing optical fiber is not protected.However, for commercial user's scene and carrying wireless traffic,
Such as MFH scene, require to have an impact using full redundancy mechanism to avoid to extensive and responsible consumer in standard, such as: Type C
Protection mechanism.
For Type C protection mechanism, in PON network system full redundancy link protection framework as shown in Figure 2, it provides two
Full redundancy link is covered, the failure that OLT, feeder fiber, SPL, introducing optical fiber, any point ONU occur in system can be resumed.
This framework ensure that the high reliability of system, and the optical fiber that is introduced into being based particularly between SPL and ONU is most easy in PON network
The fact that impaired part.However, Type C protection cannot be compatible with the existing basis PON due to introducing additional SPL
Facility, meanwhile, it not only doubles introducing optical fiber cost the backup for introducing optical fiber, also doubles construction cost.
Summary of the invention
The present invention is intended to provide a kind of improved PON network system protection structure, it is based on existing Optical Distribution Network ODN
Structure, by the way that link protection device is arranged in the side ONU, so that the introducing optical fiber of adjacent ONU is protected each other, the system protection structure
One flexible wireless front end passback MFH system can be provided for Radio Access Network, avoided due to OLT or fiber failure
Caused by service disconnection.
According to an aspect of the present invention, a kind of passive optical network is provided here comprising: local side unit, including
Several optical line terminal OLTs are sent to Optical Distribution Network ODN by respective feeder fiber and are believed by the downlink light of protection wavelength channel
Number or receive the uplink optical signal from user side optical network unit ONU；Optical power fluctuation unit, input port pass through several
Feeder fiber is connected with aforementioned several OLT respectively, and output port passes through introducing optical fiber respectively and is connected with the ONU of user side；Light
Network unit has link protection device, for coupling other ONU, makes to be coupled the connected introducing optical fiber of ONU and can be used as this
The backup of optical network unit introducing optical fiber.
Preferably, aforementioned optical network unit carries out protection switching, passes through institute when the introducing optical fiber connected breaks down
It states the introducing optical fiber that the coupled ONU of link protection device is connected and establishes connection, to receive specified downstream wavelength or transmission
Upstream wavelength.
Preferably, it in aforementioned downlink optical signal, is configured and is exported with complementary type by protection downstream wavelength.
Preferably, in aforesaid passive optical network system, an OLT is judging the work OLT by protection downstream wavelength
It when port failure, activates and backs up the port OLT in other OLT accordingly, export the optical signal in the downstream wavelength channel.
Preferably, in aforesaid passive optical network system, an OLT activates it when judging connected feeder fiber failure
All ports corresponding backup OLT in its OLT, the feeder fiber output connected by other OLT are led to by protection downstream wavelength
Road.
According to another aspect of the present invention, the local side unit in a kind of passive optical network, packet are provided here
Include: several optical line terminal OLTs are sent to Optical Distribution Network ODN by protection downstream wavelength channel by respective feeder fiber
Downlink optical signal receives the uplink optical signal from user side optical network unit ONU, wherein in the downlink optical signal, quilt
It protects downstream wavelength to configure with complementary type to export.
Preferably, in aforementioned local side unit, an OLT judge one by protection downstream wavelength port failure when, activation
The port OLT is backed up in other OLT accordingly, exports the optical signal in the downstream wavelength channel.
Preferably, in aforementioned local side unit, an OLT is activated in other OLT when judging connected feeder fiber failure
All ports corresponding backup OLT, the feeder fiber connected by other OLT are exported by protection downstream wavelength channel
According to another aspect of the present invention, a kind of optical fiber link protective device is provided here, has first, second
Introduce optical fiber input, comprising: the first WDM device is connected with the first introducing optical fiber, exports at least one optical wavelength, make
For the input of first wave length coupler；First wave length coupler, an input port is connected with the first WDM device, to connect
The first optical wavelength is received as operation wavelength, another input port is connected with the first backup link device；First backup link
Device exports the backup wavelength of first optical wavelength for being coupled with the second introducing optical fiber.
Preferably, aforementioned first backup link device includes: the second WDM device, is connected with the second introducing optical fiber,
At least two optical wavelengths are exported, one of optical wavelength is the backup wavelength of first optical wavelength；First photoswitch
Device, one end are connected with by the second wavelength division multiplexer designated port, using second be introduced into optical fiber the first optical wavelength as
Backup wavelength.
Preferably, aforementioned optical fiber link protective device further comprises: second wave length coupler, an input port and
Two WDM devices are connected, to receive the second optical wavelength as operation wavelength；Another input port and the second backup chain
Road device is connected；Second backup link device exports the standby of second optical wavelength for being coupled with the first introducing optical fiber
Part wavelength.
Aforementioned second backup link device includes: the second optical switch device, and one end is specified with by the first wavelength division multiplexer
Port is connected, and is introduced into optical fiber the second optical wavelength as backup wavelength for first.
According to another aspect of the present invention, a kind of passive optical network unit is provided here comprising: link protection dress
It sets, for coupling other optical network unit ONUs, making to be coupled the connected introducing optical fiber of ONU can be used as the optical network unit and draw
Enter the backup of optical fiber.
Preferably, aforementioned link protection device includes: WDM device, and the introducing optical fiber being connect with the ONU is connected,
Export at least the first optical wavelength；Wavelength coupler, an input port are connected with the WDM device, to receive first
Optical wavelength is connected as operation wavelength, another input port with optical switch device；
Aforementioned optical switch device is coupled with other ONU's, with described in the introducing optical fiber output that is connected from other ONU
The backup wavelength of one optical wavelength.
Preferably, aforementioned WDM device also exports the second optical wavelength, and the backup of optical fiber is introduced as other ONU.
System and its apparatus provided by according to embodiments of the present invention, it can be wireless based on existing Optical Distribution Network
Access network provides a flexible wireless front end passback MFH and comprehensively protects system, either OLT failure, feeder line light
Fine failure, the introducing fiber failure for being also proximate to user side can obtain dual redundant protection, according to the difference of configuration, even
It can accomplish that multiple redundancy is protected；ONU shielded for user side, relative to full redundancy machine mode Types Below C protection mechanism,
It utilizes the introducing optical fiber of neighbouring ONU only in ONU end setting protective device woth no need to be laid with the introducing optical fiber backup of redundancy
As its backup optical fiber, cost can be received, especially relative to serve thousands mobile subscriber up to ten thousand.
Further, embodiment according to the present invention, several optical line terminal OLTs of local side by respective feeder fiber to
ODN is sent by the downlink optical signal of protection wavelength channel, is configured in downlink optical signal with complementary type by protection downstream wavelength defeated
Out, this for wireless front end return MFH for, even if so that the RRH under a cellular system when transmission fault occurs, also only
Only only have partial service amount to be affected, and available fast quick-recovery.
Detailed description of the invention
By the detailed description with the accompanying drawing being set forth below, feature of the invention, property and advantage will become brighter
It is aobvious, identical element mark having the same in attached drawing, in which:
Fig. 1 is the PON network system architecture using analog signal convergence technology carrying wireless front end passed-back traffic；
Fig. 2 is PON network system full redundancy link protection framework under existing way；
Fig. 3 is PON network all risk insurance retaining frame of the present invention using analog signal convergence technology carrying wireless front end passed-back traffic
Structure embodiment；
Fig. 4 A is a kind of one of optical fiber link protective device embodiment provided by the invention；
Fig. 4 B is the two of a kind of optical fiber link protective device embodiment provided by the invention；
Fig. 5 is the PON network system provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
Pretection switch embodiment in system under OLT failure；
Fig. 6 is the PON network system provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
Pretection switch embodiment in system under feeder fiber failure；
Fig. 7 is the PON network system provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
The pretection switch embodiment under fiber failure is introduced in system.
Specific embodiment
In the following detailed description of the preferred embodiment, reference is constituted to the appended attached drawing of present invention a part.
Appended attached drawing, which has been illustrated by way of example, can be realized specific embodiment.Exemplary embodiment not purport
In exhaustive all embodiments according to the present invention.It should be noted that although being described in the present invention with particular order herein
The step of method, but this does not require that or implies must execute these operations in this particular order, or must
Must execute whole shown in operation be just able to achieve it is desired as a result, on the contrary, step described herein can change execution it is suitable
Sequence.Additionally or alternatively, it is convenient to omit multiple steps are merged into a step and executed, and/or one is walked by certain steps
Suddenly execution of multiple steps are decomposed into.
Fig. 3 shows the PON net provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
Network full guard framework, here with 4+System architecture and working mechanism are illustrated for G deployment scenario.According to Such analysis,
When Single wavelength carries 60 subcarriers, it is only necessary to which 2 upstream wavelengths (and 2 downstream wavelengths) can meet the number of a base station
According to carrying demand.Therefore, a base station only can be serviced with 2 ONU, and the two ONU are geographically close to each other.
In local side OLT side, the digital baseband signal that the baseband processing unit BBU of a base station is generated passes through polymerization/fractionation
After unit carries out channel convergence, analog signal is converted to via digital analog converter, the analogue data of 60 subcarriers is modulated
It is transmitted onto the same continuous light laser, and using the outgoing wave of this laser length.To meet 4+2 under G deployment scenario
The carrying demand of a base station need to use 4 ports OLT at the end OLT altogether.Consider for system resilience, in legend, two sets of OLT are set
Standby OLT1, OLT2 are equipped with all ports OLT, and the port OLT of half quantity is respectively opened with complementary type, it may be assumed that each
Two wavelength received by base station are emitted by two ports OLT being located in different OLT devices respectively, such as " λ 1 is by OLT
The port OLT 1-1 outgoing on 1, and λ 2 is emitted by the port the OLT 2-2 on OLT 2；Meanwhile corresponding λ 1 protects the OLT 2 of wavelength
On the port OLT 2-1, corresponding λ 2 protect the port the OLT 1-2 on the OLT 1 of wavelength to remain off.The wavelength of outgoing exists
After completing wavelength multiplexing in OLT, transmission wavelength X 1 and λ 3 on the feeder fiber 1 that is connected with OLT1；And the feeder line being connected with OLT2
Wavelength X 2 and λ 4 are transmitted on optical fiber 2.
It is worth noting that protected ONU needs are completed on two sets of OLT device OLT 1, OLT 2 in PON system
Registration.In this way, the logic state of " the work port OLT " can be copied within the shortest time on " port backup OLT ".Together
When, according to ITU-T G.984.1 standard suggestion, there should be data communication channel between two sets of OLT device OLT 1, OLT 2, with
Share the ONU in need for re-establishing link service configuration parameters.
In Optical Distribution Network ODN, 1 × N light in existing network is replaced using 2 × N luminous-power distributor SPL
Power divider, each input port of 2 × N luminous-power distributor pass through a feeder fiber and a set of OLT device of local side
It is connected.Each output port of 2 × N luminous-power distributor passes through an introducing optical fiber and is connected with user side ONU, legend
In, downlink optical signal transmits institute in each of 4 introducing optical fiber after SPL completes wavelength multiplexing and power distribution
There is wavelength X 1- λ 4 to the ONU being attached thereto.
In user side, under normal conditions since the introducing optical fiber of connection ONU does not back up, introducing fiber segment cannot be protected
Shield, however being introduced into fiber segment is the part most easily broken down in network.Therefore in embodiments of the present invention, we are same
Connection is established between two ONU of cellular cell, the introducing optical fiber being connected with the two ONU is mutually backups.
In a kind of situation, the passive optical network unit ONU1-1 in cellular cell 1 serves wireless front end passback MFH, it
The introducing optical fiber of adjacent ONU1-2 can be used as backup link, passive optical network unit ONU1-1 includes that a wavelength-division is multiple
With device, a wavelength coupler WC and link protection device, in which:
WDM device WDM, the introducing optical fiber being connect with ONU1-1 are connected, and export at least one optical wavelength λ 1,
Input as wavelength coupler WC；An input port of wavelength coupler WC is connected with the WDM device WDM, with
It receives optical wavelength λ 1 and is used as operation wavelength, another input port is connected with the first backup link device.First backup link
Device couples other ONU1-2, and the introducing optical fiber for keeping the ONU1-2 being coupled connected can be used as optical network unit ONU 1-1 and draw
Enter the backup of optical fiber.
Provided preferred embodiment according to the present invention, the first backup link device include a photoswitch OS1, and light is opened
It closes OS1 and ONU1-2 to be coupled, to obtain the optical wavelength λ 1 being introduced into optical fiber that ONU1-2 is connected as backup wavelength.
In the case of another, passive optical network unit ONU2-1, ONU2-1 in cellular cell 2 is served wireless simultaneously
Front end returns MFH, and passive optical network unit ONU2-1 includes that aforementioned WDM device, wavelength coupler WC and link are protected
Protection unit, is different from aforementioned ONU1-1, and WDM device exports at least two optical wavelength λ 3, λ 4, one of wavelength X
3 input as itself ONU wavelength coupler WC, another optical wavelength λ 4 are used as other ONU2-2 link backups, so
Two ONU in same cellular cell 2 are mutually backups.
In normal operation, the photoswitch in each ONU is in " disconnected " state, and ONU is only received from its ONU
The downstream wavelength carried in corresponding " the normal optical fiber link " being introduced into optical fiber.After reception, the data on this wavelength are demodulated,
And it is transferred to corresponding RRH in this base station.
It will be understood by those skilled in the art that optical fiber link protective device proposed by the invention can be used as an independence
Device and exist, be illustrated in conjunction with a kind of legend 4A one of optical fiber link protective device embodiment provided, light in legend
Fine link protection device has first, second to introduce optical fiber input, it includes the first WDM device WDM1, first wave
Long coupler WC1 and the first backup link being made of the first optical switch device OS1 and the second WDM device WDM2
Device, the link protection device are provided solely for the unilateral protection to first wave length λ 1, and second wave length λ 2 is not as protection wavelength,
Wherein:
First WDM device WDM1, the introducing optical fiber being connect with ONU1-1 are connected, and export at least one light wave wave
Long λ 1, the input as wavelength coupler WC1；
First wave length coupler WC1, there are two input port, one of input port and first wavelength-division multiplex for tool
Device WDM1 is connected, and is filled using receiving the first optical wavelength λ 1 as operation wavelength, another input port and the first backup link
It sets connected；
First backup link device, it is coupled with the second introducing optical fiber, exports the backup of the first optical wavelength λ 1
Wavelength.
Provided preferred embodiment according to the present invention, in the first backup link device: the second WDM device
WDM2 is connected with the second introducing optical fiber, exports at least two optical wavelength λ 1, λ 2, and one of optical wavelength is first light
The backup wavelength of wave wavelength X 1；And the first optical switch device OS1, one end with by the second wavelength division multiplexer WDM2 designated port phase
Even, the first optical wavelength λ 1 in optical fiber is introduced by second be used as backup wavelength.
And in the case of certain, optical fiber link protective device can also have bilateral defencive function, provide in conjunction with legend 4B
A kind of one of optical fiber link protective device embodiment is illustrated, optical fiber link protective device in legend, has first, second
It introduces optical fiber to input, in addition to aforementioned first wave length coupler WC, the first backup link device and the first wavelength-division multiplex in structure
Device WDM1 further includes second wave length coupler WC2 and by the second photoswitch to provide except the protection to first wave length λ 1
The second backup link device that device OS2 and the first WDM device WDM1 are constituted, the link protection device not only provide
Protection to first wave length λ 1, and second wave length λ 2 also can be used as protection wavelength, in which:
Second wave length coupler WC2, an input port are connected with the second WDM device WDM2, to receive the second light
Wave wavelength X 2 is used as operation wavelength, another input port is connected with the second backup link device；Second backup link device with
First introducing optical fiber is coupled, and exports the backup wavelength of the second optical wavelength λ 2.
Provided preferred embodiment according to the present invention, in the second backup link device: the first WDM device
WDM1 is connected with the first introducing optical fiber, exports at least two optical wavelengths, and one of wavelength X 1 is used as first wave length coupler
The input of WC, backup wavelength of another optical wavelength as the second optical wavelength λ 2；Second optical switch device OS2,
One end is connected with by the first wavelength division multiplexer WDM1 designated port, is introduced into 2 conduct of the second optical wavelength λ in optical fiber for first
Backup wavelength.
OLT event in the PON network system using analog signal convergence technology carrying wireless front end passed-back traffic that Fig. 5 is provided
The lower pretection switch embodiment of barrier, in the system embodiment, when OLT device and its power supply system and installation place generation disaster then
It may cause a whole set of OLT device to break down, and the failure of optical electrical device may cause some OLT port failure, specifically
It says on ground:
Local side OLT is protected using improved " double parent's types ", and terminal OLT device OLT1, OLT2 are worked at the same time, OLT1
Activate the port 1-1, OLT 1-3 output in its port OLT by protection downstream wavelength λ 1, λ 3；OLT2 activates its port OLT end 2-2, OLT
Mouth 2-4 output is so matched by protection downstream wavelength λ 2, λ 4 in downlink optical signal by protection downstream wavelength with complementary type
Set output.
A kind of situation, when the damage of a set of OLT device, the corresponding port OLT will be whole in another set of OLT device
It is activated, to provide protection backup.Such as: when OLT1 equipment damage in legend, another set of equipment OLT2 activates its all OLT
Port is sent to ODN network by the downlink optical signal λ 1- λ 4 of protection wavelength channel by feeder fiber 2.In this case,
The all of the port of OLT1 detects warning information, such as: the failure of OLT transmitter, OLT transmitter are without normal backward electric current
Or driving current is excessive, at this point it is possible to be determined as OLT device failure, can activate backup OLT all of the port to provide backup and protect
Shield.In this framework, ONU flanks the wavelength received and will not be influenced by OLT failure.Meanwhile this returns wireless front end
For MFH, even if so that the RRH under a cellular system when transmission fault occurs, also only only have partial service amount by
It influences, and available fast quick-recovery.
Another situation, i.e., some port OLT in certain a set of OLT device are broken down, such as: the port OLT 1-1 hair
Raw failure.At this time, it is only necessary to the corresponding port OLT on another set of OLT device OLT2 is activated, such as: the port OLT 2-1, this
When, the wavelength that feeder fiber 1 is carried occurred from failure before λ 1 and λ 3 become λ 3, and the wavelength that feeder fiber 2 is carried by
λ 2 and λ 4 before failure generation become λ 1, λ 2 and λ 4.After 2 × 2SPL completes wavelength multiplexing and power distribution, every introducing
Optical fiber still carries whole " λ 1- λ 4 " wavelength, identical when with normal operating conditions.In this case, the port OLT1 1-1 is detected
To warning information, such as: the failure of OLT transmitter, OLT transmitter are excessive without normal backward electric current or driving current, at this point,
It can be determined that as the port OLT 1-1 failure, can activate the corresponding port backup OLT, i.e. the port OLT 2-1 is protected with providing backup
Shield.In this framework, ONU flanks the wavelength received and will not be influenced by OLT failure.Meanwhile this returns wireless front end
For MFH, even if so that the RRH under a cellular system when transmission fault occurs, also only only have partial service amount by
It influences, and available fast quick-recovery.
Fig. 6 is the PON network system provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
Pretection switch embodiment in system under feeder fiber failure, breaking down in feeder fiber section will affect almost all of terminal use
Family, therefore should strictly avoid.Assuming that the feeder fiber 1 that OLT1 is connected breaks down, then its carrying by protection down going wave
Long λ 1 and λ 3 loses, it means that has the data of half that can not receive in each base station in the side ONU.In this case, by local side
OLT judges whether that failure has occurred in feeder fiber, and another set of OLT device OLT2 is needed to activate the port OLT available free thereon,
Such as: the port OLT 2-1, OLT port 2-3 is exported by feeder fiber 2 and corresponding is led to by protection downstream wavelength to provide backup
Road λ 1 and λ 3.So, feeder fiber 2 will carry all by protection downstream wavelength " λ 1- λ 4 ".It is similar with aforementioned circumstances,
After 2 × 2SPL completes wavelength multiplexing and power distribution, every introducing optical fiber still carries whole " λ 1- λ 4 " wavelength, and just
It is identical when normal working condition.In this framework, ONU flanks the wavelength received and will not be influenced by OLT failure.
For above situation, all ports OLT of terminal OLT device OLT1 detect warning information, such as: signal is lost
LOS is lost, all ports OLT of OLT1 are not received by effective optical signal in several uplink frames.At this point it is possible to be determined as this
Corresponding 1 launching failure of feeder fiber of OLT, can activating backup OLT2 equipment, all complementary ports are protected accordingly with providing backup
Shield.
Fig. 7 is the PON network system provided by the invention using analog signal convergence technology carrying wireless front end passed-back traffic
The pretection switch embodiment under fiber failure is introduced in system, being introduced into fiber segment is the part most easily broken down in network.Assuming that
The introducing optical fiber 1 being connect with ONU1-1 breaks down.In this case, ONU 1-1 will be unable to as under normal condition
It is received from its " working optical fibre " by 1 signal of protection downstream wavelength λ, is come therefrom, base station corresponding to the cellular cell 1
The half data for managing unit will lose.Occur to introduce fiber failure, the ONU 1 as corresponding to the introducing optical fiber concludes whether introduce
Failure has occurred in optical fiber.Later, its photoswitch OS 1 is switched to " closed " state by ONU 1-1, is established backup with ONU 1-2 and is connected
It connects.Since every introducing optical fiber carries identical by protection downstream wavelength λ 1- λ 4, ONU 1-1 can be from ONU
The downstream wavelength λ 1 for belonging to ONU 1-1 is received after the WDM of 1-2, while having no effect on the work of ONU 1-2.
For above situation, OMU1-1 detects warning information, such as: dropout, several continuous frames are interior without effectively
Downlink optical signal, at this point it is possible to be determined as the corresponding introducing fibre optical transmission failure of the ONU, this ONU switches its photoswitch OS 1
To " closed " state, backup connection is established with ONU 1-2.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, although implementing referring to preferable
Invention is explained in detail for example, those skilled in the art should understand that: it still can be to of the invention
Technical solution is modified or replaced equivalently, and these modifications or equivalent replacement cannot also make modified technical solution de-
Spirit and scope from technical solution of the present invention.
Claims (11)
1. a kind of passive optical network, characterized by comprising:
Local side unit, including several optical line terminal OLTs are protected by respective feeder fiber to Optical Distribution Network ODN transmission
The downlink optical signal of wavelength channel receives the uplink optical signal from user side optical network unit ONU；
Optical power fluctuation unit, input port are connected with aforementioned several OLT respectively by several feeder fibers, output port
It is connected respectively by introducing optical fiber with the ONU of user side；
Optical network unit has link protection device, and for coupling other ONU, making to be coupled the connected introducing optical fiber of ONU can be with
The backup that optical fiber is introduced as the optical network unit, wherein the link protection device includes:
WDM device, the introducing optical fiber being connect with the ONU are connected, and export at least the first optical wavelength；
Wavelength coupler, an input port are connected with the WDM device, to receive the first optical wavelength as work
Wavelength, another input port are connected with optical switch device；
Optical switch device, for being coupled with other, with the first light wave wave described in the introducing optical fiber output that is connected from other ONU
Long backup wavelength.
2. passive optical network as described in claim 1, it is characterised in that the optical network unit is in the introducing connected
When optical fiber breaks down, the introducing optical fiber that carries out protection switching, connected by the coupled ONU of the link protection device
Connection is established, to receive specified downstream wavelength or send upstream wavelength.
3. passive optical network as described in claim 1, it is characterised in that in the downlink optical signal, by protection down going wave
Long configured with complementary type exports.
4. passive optical network as claimed in claim 3, it is characterised in that an OLT judge one by protection down going wave
It when long work OLT port failure, activates and backs up the port OLT in other OLT accordingly, export described by protection wavelength channel
Downlink optical signal.
5. passive optical network as claimed in claim 3, it is characterised in that an OLT is judging connected feeder fiber event
When barrier, all ports corresponding backup OLT in other OLT are activated, described in the feeder fiber output connected by other OLT
By the downlink optical signal of protection wavelength channel.
6. a kind of optical fiber link protective device, have first, second to introduce optical fiber input, be characterized in that include:
First WDM device is connected with the first introducing optical fiber, exports at least one optical wavelength, couple as first wave length
The input of device；
First wave length coupler, an input port are connected with the first WDM device, using receive the first optical wavelength as
Operation wavelength, another input port are connected with the first backup link device；
First backup link device exports the backup wavelength of first optical wavelength for being coupled with the second introducing optical fiber.
7. optical fiber link protective device as claimed in claim 6, it is characterised in that the first backup link device includes:
Second WDM device is connected with the second introducing optical fiber, exports at least two optical wavelengths, one of optical wavelength
For the backup wavelength of first optical wavelength；
First optical switch device, one end are connected with by the second wavelength division multiplexer designated port, are introduced into optical fiber for second
One optical wavelength is used as backup wavelength.
8. optical fiber link protective device as claimed in claims 6 or 7, it is characterised in that further comprise:
Second wave length coupler, an input port are connected with the second WDM device, using receive the second optical wavelength as
Operation wavelength；
Another input port is connected with the second backup link device；
Second backup link device exports the backup wavelength of second optical wavelength for being coupled with the first introducing optical fiber.
9. optical fiber link protective device as claimed in claim 8, it is characterised in that the second backup link device includes:
Second optical switch device, one end are connected with by the first wavelength division multiplexer designated port, are introduced into optical fiber for first
Two optical wavelengths are used as backup wavelength.
10. a kind of passive optical network unit, characterized by comprising:
Link protection device, for coupling other optical network unit ONUs, making to be coupled the connected introducing optical fiber of ONU be can be used as
The optical network unit introduces the backup of optical fiber, wherein the link protection device includes:
WDM device, the introducing optical fiber being connect with the ONU are connected, and export at least the first optical wavelength；
Wavelength coupler, an input port are connected with the WDM device, to receive the first optical wavelength as work
Wavelength, another input port are connected with optical switch device；
Optical switch device, for being coupled with other, with the first light wave wave described in the introducing optical fiber output that is connected from other ONU
Long backup wavelength.
11. passive optical network unit as claimed in claim 10, it is characterised in that the WDM device exports the second light
Wave wavelength introduces the backup of optical fiber as other ONU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008612.6A CN106936494B (en) | 2015-12-29 | 2015-12-29 | A kind of passive optical network protection system and its apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008612.6A CN106936494B (en) | 2015-12-29 | 2015-12-29 | A kind of passive optical network protection system and its apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106936494A CN106936494A (en) | 2017-07-07 |
| CN106936494B true CN106936494B (en) | 2019-10-01 |
Family
ID=59458965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511008612.6A Active CN106936494B (en) | 2015-12-29 | 2015-12-29 | A kind of passive optical network protection system and its apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106936494B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055082B (en) * | 2017-11-14 | 2020-01-21 | 烽火通信科技股份有限公司 | C-RAN system-based single-fiber bidirectional optical line system |
| CN109067465A (en) * | 2018-09-25 | 2018-12-21 | 南京中兴软件有限责任公司 | Optical network system, OLT, method for transmitting signals and readable storage medium storing program for executing |
| CN112865913B (en) * | 2021-01-20 | 2023-03-28 | 重庆邮电大学 | Amplified saturated RSOA light source device based on mobile forward transmission |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1756175A (en) * | 2004-09-27 | 2006-04-05 | 上海贝尔阿尔卡特股份有限公司 | Passive optical network protection switching method and system and optical circuit terminal access card |
| CN1838548A (en) * | 2005-03-24 | 2006-09-27 | 上海贝尔阿尔卡特股份有限公司 | Passive optical network backup protection device |
| CN201054594Y (en) * | 2007-06-15 | 2008-04-30 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical passive network backup device |
| CN101841367A (en) * | 2010-04-14 | 2010-09-22 | 东南大学 | Optical path switching device having wavelength selection function |
| CN104125008A (en) * | 2014-07-30 | 2014-10-29 | 中国联合网络通信集团有限公司 | Method and device for protecting distribution fibers |
-
2015
- 2015-12-29 CN CN201511008612.6A patent/CN106936494B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1756175A (en) * | 2004-09-27 | 2006-04-05 | 上海贝尔阿尔卡特股份有限公司 | Passive optical network protection switching method and system and optical circuit terminal access card |
| CN1838548A (en) * | 2005-03-24 | 2006-09-27 | 上海贝尔阿尔卡特股份有限公司 | Passive optical network backup protection device |
| CN201054594Y (en) * | 2007-06-15 | 2008-04-30 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical passive network backup device |
| CN101841367A (en) * | 2010-04-14 | 2010-09-22 | 东南大学 | Optical path switching device having wavelength selection function |
| CN104125008A (en) * | 2014-07-30 | 2014-10-29 | 中国联合网络通信集团有限公司 | Method and device for protecting distribution fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106936494A (en) | 2017-07-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10411805B2 (en) | Systems and methods of optical path protection for distributed antenna systems | |
| US9794018B2 (en) | Optical network system and optical communication method | |
| US8855489B2 (en) | Communications method, particularly for a mobile radio network | |
| US20020075906A1 (en) | Signal transmission systems | |
| JP6690347B2 (en) | Optical communication system, transmitting station, and optical communication method | |
| CN106936494B (en) | A kind of passive optical network protection system and its apparatus | |
| KR100337131B1 (en) | Bi-directional, subcarrier-multiplexed self-healing ring optical network | |
| CN102811094A (en) | Protective changeover device of wave division-time division multiplexing passive optical network system and method | |
| JP5657747B2 (en) | System for implementing fiber optic wireless transmission in a passive optical network | |
| Shin et al. | CWDM networks with dual sub-channel interface for mobile fronthaul and backhaul deployment | |
| EP2573967B1 (en) | System for interconnecting nodes attached to a passive optical network | |
| CN218603576U (en) | Remote unit protection system | |
| Schrenk et al. | Towards spectrum-programmable, mesh-enabled mobile xHaul through reconfigurable WDM overlay in fully-passive networks | |
| KR101364101B1 (en) | Base station system for optic signal transmission in cloud network, multiplexer for optic signal transmission | |
| KR20130017821A (en) | Protection recovery and switching apparatus in single-core wdm ring networks | |
| EP2517390B1 (en) | Method and device for data protection in an optical communication network | |
| Kiess et al. | Protection scheme for passive optical networks shared between a fixed and a mobile operator | |
| EP2510707B1 (en) | Method and device for data processing in a passive optical network | |
| Fei et al. | A novel survivable scheme for OFDM-PON based on ring topology | |
| Pandey et al. | FWDM Radio over Fiber for Next-Generation 5G Networks | |
| Bhar et al. | Protection architecture for Passive Optical Networks using cascaded AWG and tunable components | |
| Zhang et al. | A Novel Cost-Effective WDM Self-Healing Ring for FMC Access Network | |
| Prat et al. | Commercial realization of an all optical mesh network: Extending the photonic layer to the end-user |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Applicant after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Applicant before: Shanghai Alcatel-Lucent Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |