CN105282632B - Optical mixer, DOCSIS3.0 system above uplink and eliminate its optical beat interference method - Google Patents
Optical mixer, DOCSIS3.0 system above uplink and eliminate its optical beat interference method Download PDFInfo
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Abstract
A kind of uplink of DOCSIS3.0 system above the present invention provides optical mixer and using the optical mixer, it can be to avoid the laser for the using customization wavelength excessively high problem of bring cost, so that the uplink practical value of DOCSIS3.0 system above greatly improves, a kind of optical mixer, it includes optical splitter and optical matrix switch, one end communication connection of the input terminal of the optical splitter and the optical matrix switch, the optical matrix switch has electricly connected control unit, described control unit controls the optical path on-off of the optical matrix switch and the connection of the optical matrix switch and the optical splitter.The uplink of DOCSIS3.0 system above includes cable modem, RFoG optical node, uplink optical receiver, cable modem termination system, optical mixer, while additionally providing the method that the uplink of above-mentioned DOCSIS3.0 system above is interfered in middle optical beat of eliminating.
Description
Technical field
The present invention relates to radio and television two-way communication fields, more particularly in optical mixer, DOCSIS3.0 system above
Line link and eliminate its optical beat interference method.
Background technique
DOCSIS (Data Over Cable Service Interface Specifications, data over cable
Service interface specification), it is the international standard formulated by wire cable normal structure Cable Labs, excellent QoS
(Quality of Service, service quality) is spoken approvingly of in the industry.The core equipment of DOCSIS is CMTS(Cable Modem
Terminal Systems cable modem termination system) and CM(Cable Modem cable modem), CMTS is
The local side apparatus of DOCSIS system, CM are the terminal devices of DOCSIS system.In general CMTS is installed in computer room, CM quilt
It is mounted on user terminal (being typically mounted in user family).Bidirectional communication link is divided into downlink and uplink between CMTS to CM
Link, downlink refer to the link from CMTS to CM, otherwise are uplinks.
As light entering and copper back constantly promotes, optical node is constantly refined, and optical node is constantly to user terminal promotes, quantity constantly increases
Add, trunk optical fiber demand is caused to be continuously increased, the uplink linght receipts of computer room are also continuously increased.It is received and trunk light to solve uplink linght
The cost problem of cable, in recent years RFoG(RF over Glass, optical fiber radio frequency transmission) technology is widely applied, make " uplink
Optical-fiber network " can use the tree structure similar with " downlink optical-fiber network ".RFoG is SCTE(Society of Cable
Television Engineers American Cable TV Association of Engineers) technical specification formulating, in RFoG optical node
Uplink optical transmitter module can open and close laser according to the uplink transmission power of CM.In the DOCSIS2.0 epoch, thereon
Downlink is all single channel, and down going channel is known as DS, and data feedback channel is known as US, and uplink signal control technology mainstream is multiple for the TDM(time-division
With), that is to say, that in the same time, " in the broadcast domain of the same CMTS " at most only one CM emits signal, means that same
The uplink optical sender of only one most optical node is working in one time.It is thus easy to come from using optical mixer
The fiber mix of multiple optical nodes at computer room is sent to all the way, and the uplink linght inside computer room is received quantity and also greatly reduced, and cost is obvious
It reduces.Fig. 1 is typical case of the RFoG optical node in DOCSIS2.0 uplink.
The DOCSIS3.0 equipment rapid proliferation of multichannel binding technology is supported in recent years, and DOCSIS3.0 device bandwidth is significantly
Increase, supports that the CMTS Typical Disposition of DOCSIS3.0 is 16 downlink RF channels (radio-frequency channel), the downlink with 800MBPS
Bandwidth；4 uplink RF channels, the upstream bandwidth with 160MBPS.But RFoG Technique Popularizing occurs for DOCSIS3.0 specification
Problem, in order to improve communication bandwidth, DOCSIS3.0 has used channel bundled technology, allows " the broadcast domain of the same CMTS
It is interior " radio-frequency channels of multiple uplinks is concurrent, although each channel still uses TDM technology, be between these radio-frequency channels
It works independently mutually.This means that having multiple CM " in the same time " while emitting signal, if the model using Fig. 2
It will cause multiple RFoG optical nodes while shining.Although those frequencies of the CM emitted simultaneously on radio frequency are separated, radio frequencies
Frequency division multiplexing on channel, but truly had by the modulated optical maser wavelength of RFoG optical node may be it is identical, they arrive simultaneously
Up to the same uplink linght time receiving of computer room, error code just produces at once.Here it is the OBI(Optical Beat that people in the industry often says
The interference of Interference optical beat) phenomenon.
OBI is the interference generated after convergence since the wavelength of two beam laser is got too close to, and is that a kind of common light interference is existing
As being found through experiments that the light interference phenomenon of same frequency will lead to link SNR similar to the problem of co-channel interference of radio frequency link
(Signal Noise Ratio signal-to-noise ratio) serious deterioration, and then lead to a large amount of error codes.
Solve the problems, such as that the simplest method of OBI is that each optical node is allowed to use the laser of customization wavelength.As notification number is
Using the laser of customization wavelength in 204131651U Chinese utility model patent, the optical signal for generating different wave length is returned to subtract
Few OBI problem, can completely avoid the overlapping of optical wavelength.But this will lead to optical node cost and steeply rises, along with maintenance
Inconvenience, so this kind of scheme practical value is very low.
Summary of the invention
To the above problem, the present invention provides the DOCSIS3.0 or more of a kind of optical mixer and the application optical mixer
The uplink of system, can be to avoid the laser for the using customization wavelength excessively high problem of bring cost, so that uplink
Road practical value greatly improves, while additionally providing the uplink for eliminating above-mentioned DOCSIS3.0 system above in middle optical beat
The method of interference.
A kind of optical mixer, it is characterised in that: including optical splitter and optical matrix switch, the input terminal of the optical splitter and institute
One end communication connection of optical matrix switch is stated, the optical matrix switch has electricly connected control unit, described control unit control
The optical path on-off of the optical matrix switch and the connection of the optical matrix switch and the optical splitter.
A kind of uplink of DOCSIS3.0 system above, including what is be connected:
Cable modem, for being converted to after radiofrequency signal the ethernet signal from user terminal through data feedback channel
It uploads；
RFoG optical node, for being uploaded after converting optical signal for the radiofrequency signal from the cable modem；
Uplink optical receiver, for being uploaded after originally the optical signal of the RFoG optical node is converted into radiofrequency signal in the future；
Cable modem termination system, for originally the radiofrequency signal of the uplink optical receiver to be converted into ether in the future
Net signal is sent to Metropolitan Area Network (MAN)；
It is characterized by:
Optical mixer is provided between the uplink optical receiver and the RFoG optical node, the optical mixer includes
Optical splitter and optical matrix switch, the input terminal of the optical splitter are connected with one end of the optical matrix switch, each optical splitter
It is connected separately with the uplink optical receiver, the receiving end of the uplink optical receiver and the output end of the optical splitter are logical
News connection, one end of the RFoG optical node and the other end communication connection of the optical matrix switch, the optical matrix switch electricity
Control is connected with control unit, described control unit control the optical matrix switch optical path on-off and the optical matrix switch
With the connection of the optical splitter, described control unit, which controls the radiofrequency signal of the cable modem to different uplinks, leads to
In road, described control unit is by reading the information in the snmp protocol for uploading link come detection signal-to-noise ratio.
Further, the RFoG optical node uses Distributed Feedback Laser.
A method of eliminating the optical beat interference of the uplink of above-mentioned DOCSIS3.0 system above, it is characterised in that:
The topological structure between cable modem and RFoG optical node is obtained, cable modulatedemodulate is controlled as unit of RFoG optical node
The data feedback channel for adjusting device, the uplink channel descriptor for controlling cable modem is the data feedback channel for controlling RFoG optical node, is led to
Signal-to-noise ratio variation when control unit detection RFoG optical node uploads optical signal is crossed to determine the light that will generate optical beat interference
Combination of nodes；The RFoG optical node sorting and grouping building OBI cluster of optical beat interference will be generated；Each OBI cluster is assigned to not
In same data feedback channel.
Further, detection can generate the RFoG optical node of optical beat interference and building OBI cluster specifically includes following step
It is rapid:
Step (1): the input port of matrix switch is closed one by one by control unit come the logical of coupling cable modem
Letter obtains the topological structure between cable modem and RFoG optical node, and cable tune is controlled as unit of RFoG optical node
The data feedback channel of modulator-demodulator, the uplink channel descriptor for controlling cable modem be control RFoG optical node uplink it is logical
Road.
Step (2): creating an OBI cluster as current OBI cluster by control unit, selects a data feedback channel as working as
Preceding data feedback channel selects a RFoG optical node to be added in current OBI cluster and control into current data feedback channel；
Step (3): it selects next RFoG optical node as current optical node by control unit and control arrives another
In data feedback channel, uploaded simultaneously with any RFoG optical node in current OBI cluster respectively by reading the information inspection in snmp protocol
Survey signal-to-noise ratio；
Step (4): there are OBI, described control unit will be worked as two RFoG optical nodes if detecting signal-to-noise ratio deterioration
Preceding RFoG optical node is added in current OBI cluster and by the control of current RFoG optical node into current data feedback channel, otherwise to working as
Preceding optical node is not dealt with；
Step (5): step (3), step (4) are repeated, all RFoG optical nodes is successively detected, obtains in current OBI cluster
Whole RFoG optical nodes；
Step (6): after obtaining whole RFoG optical nodes in current OBI cluster, described control unit is from all RFoG light sections
Point removes whole RFoG optical nodes in current OBI cluster；
Step (7): repeating step (2)-step (6) on the basis of the remaining RFoG optical node of step (5), until
All RFoG optical nodes are marked as the member of each OBI cluster, obtain all OBI clusters and it includes RFoG optical node.
Further, before being assigned in OBI cluster in different data feedback channels, OBI cluster is split and is recombinated,
Before OBI cluster is assigned in different data feedback channels, OBI cluster is split and recombinated, so that in different data feedback channels
RFoG optical node quantity tends to be balanced.
Further, the fractionation to OBI cluster and recombination must satisfy following condition:
(1), when with a RFoG optical node, b mixing group, e data feedback channel, when meeting a can be divided exactly by b,
There is a/b RFoG optical node in each mixing group, conversely, working as d more than a/b=c, then there are c+1 in the 1st to d-th mixing group
RFoG optical node has c RFoG optical node in d+1 to b-th mixing group；
(2), when b is less than or equal to e, each OBI cluster is at most distributed in b data feedback channel, if the RFoG light section of OBI cluster
Point distribution is in different data feedback channels, and RFoG optical node of the distribution in different data feedback channels must be simultaneously in the same OBI cluster
Satisfaction belongs to different mixing groups；When b is greater than e, each OBI cluster is at most distributed in e data feedback channel, if OBI cluster
RFoG optical node distributes in different data feedback channels, RFoG optical node of the distribution in different data feedback channels in the same OBI cluster
It must simultaneously meet and belong to different mixing groups；
(3), after one of OBI cluster distributes, the RFoG optical node in one of data feedback channel is more logical than other uplinks
Member in road more z, then z RFoG optical node in next OBI cluster is first just assigned to it in the distribution of next OBI cluster
In his data feedback channel.
The invention has the advantages that
Optical mixer in the present invention does not have electrooptical device, so that device cost reduces, it is low in energy consumption, it can be with
It is used in adverse circumstances, the scope of application is more extensive；Optical mixer of the invention is applied to the upper of DOCSIS3.0 system above
In line link, it can be led to using the method for the optical beat interference of the uplink of elimination DOCSIS3.0 system above of the invention
It crosses detection and can generate the optical node group merging of OBI and be classified into OBI cluster, then the control of OBI cluster is uploaded into different data feedback channels,
So that can generate the combination of the optical node group of OBI will not upload simultaneously, the generation of OBI phenomenon is avoided；It is fixed to use simultaneously
The laser of wavelength processed generates the optical signal of different wave length, avoid optical node bring using customization wavelength it is huge at
This brings convenience, while the uplink of DOCSIS3.0 system above to equipment operation maintenance so that uplink cost is reduced
The practical value of link also greatly improves；The uplink of DOCSIS3.0 system above of the invention keeps optical-fiber network in tree-like
Structure can save a large amount of optical cable, to reduce cost.
Detailed description of the invention
Fig. 1 is application schematic diagram of the existing RFoG optical node in DOCSIS2.0 uplink；
Fig. 2 is application schematic diagram of the existing RFoG optical node in DOCSIS3.0 uplink；
Fig. 3 is the wavelength of transmitted light test data table of the RFoG optical node in the embodiment of the present invention；
Fig. 4 summarizes tables of data for the OBI cluster in the embodiment of the present invention；
Fig. 5 is the tables of data after the mixed reorganization in the embodiment of the present invention；
Structural schematic diagram with 2 delivery outlets, 32 input ports of optical mixer Fig. 6 of the invention；
Fig. 7 is the application schematic diagram of the uplink of the DOCSIS system of invention；
Fig. 8 is the schematic block diagram of the uplink of the DOCSIS system of invention.
Specific embodiment
In present embodiment, specifically describe based on DOCSIS3.0 technology the case where optical mixer of the invention,
The method of the optical beat interference of the uplink, the uplink of elimination DOCSIS system of DOCSIS system, supports DOCSIS3.0
CMTS Typical Disposition be 16 downlink RF channels, with 800MBPS downlink bandwidth, 4 uplink RF channel US1, US2,
US3, US4, the upstream bandwidth with 160MBPS.
Optical mixer 1 of the invention includes optical splitter 6 and optical matrix switch 7, and input terminal 8 and the light matrix of optical splitter 6 are opened
7 one end communication connection is closed, optical matrix switch 7 has electricly connected control unit 10, seen Fig. 6, and optical splitter 6 is arranged in the present embodiment
There are two, light output A and light output B are shown as in Fig. 6, therefore the optical mixer 1 in the present embodiment is one with 2 outputs
Mouthful, the optical mixers of 32 input ports.
See Fig. 7, Fig. 8, the uplink of the DOCSIS3.0 system of the present embodiment contains optical mixer 1, uplink light-receiving
Device 2, RFoG optical node 3, modulation /demodulation terminal system 4, cable modem 5, control unit 10.
In the present embodiment, RFoG optical node uses Distributed Feedback Laser, two Distributed Feedback Laser (Distributed Feedback
Laser, i.e. distributed feedback laser) wavelength difference obvious effect of the OBI to signal-to-noise ratio, this reality when being less than 0.2nm
The 32 RFoG optical nodes that contain in example are applied, Fig. 3 is the wavelength of transmitted light data of 32 RFoG optical nodes, wavelength of transmitted light number
It sorts according to wavelength has been pressed；
The RFoG optical node ID combination (referred to as OBI cluster) that can generate OBI is also analyzed in the table of Fig. 3, it can be found that
With the presence of multiple OBI clusters.
See Fig. 7, Fig. 8, the uplink of DOCSIS3.0 system is whole from cable modem 5 to cable modem
Ethernet signal from user terminal is converted to radiofrequency signal by the signal transmission link of end system 4, cable modem 5,
Between RFoG optical node and cable modem 5, upstream radio-frequency signal and downlink radio-frequency signal have used frequency division multiplexing skill
Art, uplink and downlink signals are transmitted in same root cable and are not interfere with each other, and upstream radio-frequency signal is uploaded through data feedback channel, RFoG optical node
Upstream radio-frequency signal is converted to optical signal to send, uplink optical receiver 2 by the optical signal from RFoG optical node 3 again
Radiofrequency signal is gone back to, last cable modem termination system 4 converts ethernet signal for upstream radio-frequency signal and is sent to city
Domain net.The signal conversion of uplink is 5 state conversions: Ethernet-radio frequency-light-radio frequency-Ethernet.
In the uplink of the DOCSIS3.0 system of the present embodiment, optical mixer 1 is arranged in 2 He of uplink optical receiver
Between RFoG optical node 3, each optical splitter 6 is connected separately with a uplink optical receiver 2, the receiving end of uplink optical receiver with
9 communication connection of output end of optical splitter, one end of RFoG optical node 3 and the other end communication connection of optical matrix switch 7, light matrix
Switch 7 has electricly connected control unit 10, and control unit 10 controls the optical path on-off and optical matrix switch 7 of optical matrix switch 7
With the connection of optical splitter 6, control unit 10 can control the radiofrequency signal of cable modem 5 to different data feedback channels
In, control unit can be by reading the information in the snmp protocol for uploading link come detection signal-to-noise ratio.
The Distributed Feedback Laser of RFoG optical node is controlled by the uplink signal of cable modem 5, in the uplink, electricity
When cable modem 5 emits radiofrequency signal, RFoG optical node just shines；Optical mixer 1, can be by input light when just powering on
Fine sequence accesses, that is to say, that input port 1 ~ 16 is mixed into light output A, and input port 17 ~ 32 is mixed into light output B.At this time due to
The influence of OBI phenomenon, the uplink signal-to-noise ratio for having some CM are very poor.
In order to solve the problems, such as OBI, the optical beat interference of the uplink using elimination DOCSIS system of the invention is needed
Method, the topological structure between available cable modem and RFoG optical node controlled as unit of RFoG optical node
The data feedback channel of cable modem processed is detected signal-to-noise ratio when RFoG optical node uploads optical signal by control unit and changed
To determine the optical node combination that will generate optical beat interference；The RFoG optical node sorting and grouping structure of optical beat interference will be generated
Build OBI cluster；Each OBI cluster is assigned in different data feedback channels.
Cable modem termination system is Cable Modem Terminal Systems, is come hereafter abbreviated with CMTS
It indicates；Cable modem is Cable Modem, is indicated hereafter abbreviated with CM；Optical beat interference is Optical Beat
Interference is indicated hereafter abbreviated with OBI.
In the method for the optical beat interference of the uplink of the elimination DOCSIS3.0 system of the invention using invention, first
It is prepared step, it is specific: to eliminate OBI: all CM being controlled by control unit and are all limited in data feedback channel US1, so
And uploading bandwidth can only use a quarter, but OBI no longer exists, all CM can be communicated without packet loss, and all CM work
In US1, then it will lead to the waste of other 3 data feedback channels, inefficiency, preparation process 1 is in order to facilitate subsequent control.
Detection can generate the RFoG optical node of optical beat interference and building OBI cluster specifically comprises the following steps:
Step (1): the topological structure between CM and RFoG optical node is obtained, matrix switch is closed by control unit one by one
Input port obtains the topological structure between CM and RFoG optical node.Concrete operations are: after matrix switch input port is closed 5 seconds
Restore, closing matrix switch input port will cause associated CM communication disruption, be counted from the management information of CMTS by packet loss
These CM inventories are obtained with channel utilization index parameter, so that the topological structure between all CM and optical mixer input port is obtained,
Since RFoG optical node and optical mixer input port are one-to-one, and then the topology knot between CM and optical node is obtained
Structure, since RFoG optical node and CM are many-to-one relationships, it is necessary first to which the corresponding relationship for determining CM and optical node facilitates control
Unit by CM control into different data feedback channels, RFoG optical node be it is uncontrolled, RFoG optical node discovery CM have radio frequency uplink,
Laser transmitting is turned on, therefore control unit 10 controls RFoG optical node and actually leads into data feedback channel for control CM to uplink
Road, control cable modem uplink channel descriptor be control RFoG optical node data feedback channel, complete preparation process 1,
Start the data feedback channel that CM is controlled as unit of optical node after preparation process 2, each optical node can select the channel US (can
Select US1, US2, US3, US4)
Step (2): creating an OBI cluster as current OBI cluster by control unit 10, select data feedback channel US1 as
Current data feedback channel selects a RFoG optical node to be added in current OBI cluster and control into current data feedback channel US1；
Step (3): control unit 10 selects next RFoG optical node as current optical node and controls on another
In row of channels US2, uploaded simultaneously with any RFoG optical node in current OBI cluster respectively by reading the information inspection in snmp protocol
Survey signal-to-noise ratio；
Step (4): if detecting signal-to-noise ratio deterioration two RFoG optical nodes of explanation, there are OBI, will by control unit
Current RFoG optical node, which is added in current OBI cluster and controls to current uplink, to be led in the road US1, otherwise is not made to current optical node
Processing；
Step (5): step (3), step (4) are repeated, all RFoG optical nodes is successively detected, obtains in current OBI cluster
Whole RFoG optical nodes；
Step (6): after obtaining whole RFoG optical nodes in current OBI cluster, by control unit 10 from all RFoG light
Node removes whole RFoG optical nodes in current OBI cluster；
Step (7): repeating step (2)-step (6) on the basis of the remaining RFoG optical node of step (6), until
All RFoG optical nodes are marked as the member of different OBI clusters, obtain all OBI clusters and it includes RFoG optical node.
The RFoG optical node group merging building OBI cluster of OBI can be generated by detecting, the data that summarize of obtained OBI cluster are shown in
Fig. 4,32 RFoG optical nodes form 7 OBI clusters altogether, and each OBI cluster is assigned in different data feedback channels and is uploaded, it may occur that
The RFoG optical node of OBI would not upload the OBI problem that causes simultaneously, while need not be generated not using the laser of customization wavelength
The optical signal of co-wavelength avoids the optical node bring significant cost using customization wavelength, brings to equipment operation maintenance
It is convenient, whole data feedback channels are furthermore also used, the ability to communicate of system will not be reduced.
See that Fig. 4, the 3rd cluster there are 12 RFoG optical nodes, the DOCSIS3.0 system in the present invention has 4 data feedback channels
US1, US2, US3, US4 are required according to static equilibrium, and 32 RFoG optical nodes need to be evenly distributed in each data feedback channel,
It is excessively crowded if the member of the 3rd cluster is limited in a data feedback channel, it is unable to satisfy the requirement of static equilibrium.
Four, OBI cluster splitting and reorganizing: the requirement in order to meet static equilibrium is assigned in different data feedback channels in OBI cluster
Before, OBI cluster is split and is recombinated by control unit, for avoiding RFoG optical node in any OBI cluster from excessively making
It is unbalanced at static state, so that the RFoG optical node quantity in different data feedback channels tends to be balanced.
It meets distributive condition when distribution:
(1), when with a RFoG optical node, b mixing group, e data feedback channel, when meeting a can be divided exactly by b,
There is a/b RFoG optical node in each mixing group, conversely, working as d more than a/b=c, then have c+1 RFoG in the 1-d mixing group
Optical node has c RFoG optical node in the d+1-b mixing group.
(2), when b is less than or equal to e, each OBI cluster is at most distributed in b data feedback channel, if the RFoG light section of OBI cluster
Point distribution is in different data feedback channels, and RFoG optical node of the distribution in different data feedback channels must be simultaneously in the same OBI cluster
Satisfaction belongs to different mixing groups；When b is greater than e, each OBI cluster is at most distributed in e data feedback channel, if OBI cluster
RFoG optical node distributes in different data feedback channels, RFoG optical node of the distribution in different data feedback channels in the same OBI cluster
It must simultaneously meet and belong to different mixing groups.
(3), after one of OBI cluster distributes, the RFoG optical node in one of data feedback channel is more logical than other uplinks
Member in road more z, then z RFoG optical node in next OBI cluster is first just assigned to it in the distribution of next OBI cluster
In his data feedback channel.
Two mixing groups are constituted using two optical splitters in the present embodiment, is respectively used to upload, have in the present embodiment
In the case where two optical splitters and 32 RFoG optical nodes, the splitting and reorganizing principle of OBI cluster is as follows:
1, each mixing group must distribute 16 nodes.
2, each OBI cluster at most distributes in 2 data feedback channels, must belong to if distribution is in two data feedback channels
Different mixing groups.
3,32 nodes mean allocation as far as possible in 4 data feedback channels.
RFoG optical node in each OBI cluster is equally divided into two groups as far as possible, these groups are averagely then assigned to 2
In a mixing group, the group in mixing group is then controlled in different data feedback channels, so that it is met each OBI cluster of process most
Distribution must belong to different mixing groups if distribution is in two data feedback channels, meet 32 as far as possible in 2 data feedback channels
A node mean allocation as far as possible in 4 data feedback channels, only one member of OBI cluster if it exists can be in data feedback channel
Arbitrary disposition plays the role of flexible allotment, and allocation result is shown in Fig. 5, and OBI cluster splitting and reorganizing distributes in 4 data feedback channels,
So that 8 RFoG optical nodes are distributed in each channel.And two mixing groups A, B are formed, each mixing group includes 16 members,
It can be to avoid OBI in mixing group.
Shown in fig. 6 is answering for optical mixer of the RFoG optical node in DOCSIS3.0 environment in Fig. 5 after mixing fractionation
Computer room is arrived using two uplink optical fibers with, optical mixer, also there are the corresponding receptions of two uplink optical receivers in computer room, after reception
Electric signal, which passes through after electric mixer merges, is sent to CMTS, and the signal from RFoG optical node can be fully according to the node in Fig. 6
It number is grouped and can work well, avoid the generation of OBI phenomenon.
If some OBI cluster is greater than 16 members, some US needs to accommodate certainly extra 8 optical nodes and generates and gather around
It squeezes, such case load balancing cannot perform to optimal.Control unit is able to detect that such case, can in time provide
RFoG optical node is replaced, replacement process needs to disconnect the network service of single RFoG optical node, needs to operate with caution, can after replacement
The performance of system can be needed to retest, so needing in the acceptable period construction of terminal user.
In the art at present, it is suitable for DOCSIS3.1 standard, DOCSIS3.1 standard can make of the invention
Application prospect is wider, because DOCSIS3.1 supports higher upstream bandwidth.The excessive RFoG for causing single data feedback channel of OBI cluster
The single data feedback channel of the crowded problem of optical node, DOCSIS3.1 possesses bigger bandwidth, this will make congested problem seem not that
It is serious.
The optical splitter quantity of optical mixer can be arranged according to the actual situation, so as to adjust the number of output of optical mixer,
The optical mixer of 2 tunnels output in the above-described embodiments, if some OBI cluster is greater than 16 members, some data feedback channel is agreed
Surely it needs to accommodate extra 8 optical nodes and generates crowded.If optical mixer is extended to 4 tunnel light outputs using 4 optical splitters
Then congested problem has not just existed.And each cluster may be divided into 4 groups (not less than the cluster of 4 members), each group
Positioned at different US and different mixing groups.RFoG optical node classification method and OBI cluster construction method and the splitting and reorganizing of OBI cluster are former
It manages identical with the optical mixer that 2 tunnels export.
Claims (4)
1. a kind of method of the optical beat interference of uplink for eliminating DOCSIS3.0 system above, which is characterized in that
The uplink of DOCSIS3.0 system above includes being connected:
Cable modem, for being converted to after radiofrequency signal the ethernet signal from user terminal through data feedback channel
It passes；
RFoG optical node, for being uploaded after converting optical signal for the radiofrequency signal from the cable modem；
Uplink optical receiver, for being uploaded after originally the optical signal of the RFoG optical node is converted into radiofrequency signal in the future；
Cable modem termination system, for originally the radiofrequency signal of the uplink optical receiver to be converted into Ethernet letter in the future
Number it is sent to Metropolitan Area Network (MAN)；
The optical mixer being provided between the uplink optical receiver and the RFoG optical node, the optical mixer include point
Light device and optical matrix switch, the input terminal of the optical splitter are connected with one end of the optical matrix switch, each optical splitter point
It is not connected with the uplink optical receiver, the receiving end of the uplink optical receiver and the output end communication of the optical splitter
Connection, one end of the RFoG optical node and the other end communication connection of the optical matrix switch, the optical matrix switch are automatically controlled
Be connected with control unit, described control unit control the optical matrix switch optical path on-off and the optical matrix switch with
The connection of the optical splitter, described control unit control the radiofrequency signal of the cable modem to different data feedback channels
In, described control unit is by reading the information in the snmp protocol for uploading link come detection signal-to-noise ratio；The RFoG optical node
Using Distributed Feedback Laser；
The topological structure between cable modem and RFoG optical node is obtained, cable tune is controlled as unit of RFoG optical node
The data feedback channel of modulator-demodulator, the uplink channel descriptor for controlling cable modem be control RFoG optical node uplink it is logical
Road, optical beat interference will be generated to determine by detecting signal-to-noise ratio variation when RFoG optical node uploads optical signal by control unit
Optical node combination；The RFoG optical node sorting and grouping building OBI cluster of optical beat interference will be generated；Each OBI cluster is distributed
Into different data feedback channels.
2. a kind of side of the optical beat interference of uplink for eliminating DOCSIS3.0 system above according to claim 1
Method, it is characterised in that: detection can generate the RFoG optical node of optical beat interference and building OBI cluster specifically comprises the following steps:
Step (1): it closes the input port of matrix switch one by one by control unit come the communication of coupling cable modem, obtains
The topological structure between cable modem and RFoG optical node is taken, controls cable modem as unit of RFoG optical node
The data feedback channel of device, the uplink channel descriptor for controlling cable modem is the data feedback channel for controlling RFoG optical node；
Step (2): creating an OBI cluster as current OBI cluster by control unit, selects a data feedback channel as on currently
Row of channels selects a RFoG optical node to be added in current OBI cluster and control into current data feedback channel；
Step (3): next RFoG optical node is selected as current optical node by control unit and is controlled to another uplink
In channel, uploaded simultaneously with any RFoG optical node in current OBI cluster respectively by reading the infomation detection letter in snmp protocol
It makes an uproar ratio；
Step (4): for two RFoG optical nodes there are OBI, described control unit will be current if detecting signal-to-noise ratio deterioration
RFoG optical node is added in current OBI cluster and by the control of current RFoG optical node into current data feedback channel, otherwise to current
Optical node is not dealt with；
Step (5): step (3), step (4) are repeated, all RFoG optical nodes is successively detected, obtains the whole in current OBI cluster
RFoG optical node；
Step (6): after obtaining whole RFoG optical nodes in current OBI cluster, described control unit is moved from all RFoG optical nodes
Except whole RFoG optical nodes in current OBI cluster；
Step (7): repeating step (2)-step (6) on the basis of the remaining RFoG optical node of step (5), until all
RFoG optical node is marked as the member of each OBI cluster, obtain all OBI clusters and it includes RFoG optical node.
3. a kind of side of the optical beat interference of uplink for eliminating DOCSIS3.0 system above according to claim 2
Method, it is characterised in that: before being assigned in OBI cluster in different data feedback channels, OBI cluster is split and recombinated, so that
RFoG optical node quantity in different data feedback channels tends to be balanced.
4. a kind of side of the optical beat interference of uplink for eliminating DOCSIS3.0 system above according to claim 3
Method, it is characterised in that: OBI cluster, which is split and recombinated, must satisfy following condition:
(1), when with a RFoG optical node, b mixing group, e data feedback channel, when meeting a can be divided exactly by b, each
There is a/b RFoG optical node in mixing group, conversely, working as d more than a/b=c, then have c+1 RFoG light in the 1st to d-th mixing group
Node has c RFoG optical node in d+1 to b-th mixing group；
(2), when b is less than or equal to e, each OBI cluster is at most distributed in b data feedback channel, if the RFoG optical node of OBI cluster point
It fits in different data feedback channels, RFoG optical node of the distribution in different data feedback channels must simultaneously meet in the same OBI cluster
Belong to different mixing groups；When b is greater than e, each OBI cluster is at most distributed in e data feedback channel, if the RFoG light of OBI cluster
Node distributes in different data feedback channels, and RFoG optical node of the distribution in different data feedback channels must be same in the same OBI cluster
When meet belong to different mixing groups；
(3), after one of OBI cluster distributes, the RFoG optical node in one of data feedback channel is than in other data feedback channels
Member more z, then just first z RFoG optical node in next OBI cluster is assigned on other in the distribution of next OBI cluster
In row of channels.
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