CN105306144B - Repeater, using the repeater up-link and eliminate its optical beat interference method - Google Patents
Repeater, using the repeater up-link and eliminate its optical beat interference method Download PDFInfo
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- CN105306144B CN105306144B CN201510784658.0A CN201510784658A CN105306144B CN 105306144 B CN105306144 B CN 105306144B CN 201510784658 A CN201510784658 A CN 201510784658A CN 105306144 B CN105306144 B CN 105306144B
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Abstract
The invention provides a kind of up-link, optical signal is relayed, can solve the problems, such as optical attenuation in up-link, including cable modem, RFoG optical nodes, up optical receiver, cable modem termination system, repeater, the repeater applied to up-link is additionally provided simultaneously, including：Optical transmitting set, RF blenders and Optical Receivers, Optical Receivers include optical splitter, optical receiver, RF attenuators, also provided is the method for eliminating that optical beat disturbs in up-link.
Description
Technical field
The present invention relates to radio and television two-way communication field, more particularly, to applied in DOCSIS3.0 system above
After device, using the repeater up-link and eliminate its optical beat interference method.
Background technology
DOCSIS (Data Over Cable Service Interface Specifications, data over cable
Service interface specification）, be one by wire cable normal structure Cable Labs formulate international standard, its excellent QoS
（Quality of Service, service quality）Spoken approvingly of in the industry.DOCSIS nucleus equipment is CMTS（Cable Modem
Terminal Systems cable modem termination systems）And CM（Cable Modem cable modems）, CMTS is
The local side apparatus of DOCSIS systems, CM are the terminal devices of DOCSIS systems.In general CMTS is installed in computer room, CM quilts
Installed in user terminal（It is typically mounted in user family）.Bidirectional communication link is divided into downlink and up between CMTS to CM
Link, downlink refer to the link from CMTS to CM, otherwise are up-links.
As light entering and copper back constantly promotes, optical node constantly refines, and optical node is constantly to user terminal promotes, quantity constantly increases
Add, cause trunk optical fiber demand to be continuously increased, the up light of computer room, which is received, to be also continuously increased.Received and trunk light to solve up light
The Cost Problems of cable, in recent years RFOG（RF over Glass, optical fiber radio frequency transmission）Technology is widely applied, and is made " up
Optical-fiber network " can use the tree structure similar with " descending optical-fiber network ".RFOG is SCTE（Society of Cable
Television Engineers American Cable TVs IEEE）The technical specification formulated, in RFOG optical nodes
Up light emission module can open and close laser according to CM uplink transmission power.In the DOCSIS2.0 epoch, thereon
Descending is all single channel, and down channel is referred to as DS, and up channel is referred to as US, and upward signal control technology main flow is TDM（Time-division answers
With）, that is to say, that in the same time, " in same CMTS broadcast domain " at most only CM transmission signal, mean that same
The up optical sender of an at most only optical node is working in one time.Thus it is easy to come from using optical mixer
The fiber mix of multiple optical nodes into computer room is sent to all the way, and the up light inside computer room is received quantity and also greatly reduced, and cost is obvious
Reduce.Fig. 1 is typical case of the RFOG optical nodes in DOCSIS2.0 up-links.It is this directly to use common optical mixer
The pattern mixed is referred to as " directly mixing pattern ".
Because under straight mixed pattern, optical link decay and splitting ratio have direct relation.Recently as the refinement of optical node, divide
Light is than increasing so that the light decay of whole link is increasing, and the luminous power for reaching computer room begins to photoreceiver reception
The lower limit of ability, or even the up signal to noise ratio of link is had influence on, such as the Chinese utility model patent that notification number is 201270573Y
In provide a kind of uplink multi-path light mixing relay station, receive mixing and then the side that retransmits by the way that optical signal is passed through into optical splitter
Method, the luminous power of up-link is improved, play relaying action, but such uplink multi-path light mixing relay station can not be used
In the up-link based on DOCSIS3.0, because DOCSIS3.0 has used channel bundled technology, it is allowed to " same CMTS's
In broadcast domain " multiple up radio-frequency channels are concurrent, although each passage still uses TDM technologies, these radio-frequency channels
Between work independently mutually.This means having multiple CM transmission signals simultaneously, and uplink multi-path light " in the same time "
Relay station is mixed because light mixing be present, OBI be present（Optical Beat Interference optical beats disturb）Hair
Raw possibility, OBI are due to that the wavelength of two beam laser is got too close to, and caused interference after convergence, will cause link SNR
（Signal Noise Ratio signal to noise ratio）Serious deterioration, it is a kind of common light interference phenomenon, although what those launched simultaneously
Frequencies of the CM on radio frequency is separated, is frequency division multiplexing on radio-frequency channel, but passes through the laser wave after the modulation of RFOG optical nodes
Long truly have is probably identical, and they reach the same up smooth time receiving of computer room after the optical splitter mixing of repeater, by mistake
Code just generates at once, and here it is OBI phenomenons.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of up-link, optical signal can be relayed, solve uplink
In road the problem of optical attenuation, while the repeater applied to up-link is additionally provided, also provided is elimination up-link
The method of middle optical beat interference.
A kind of up-link, including be connected：
Cable modem, for the ethernet signal from user terminal to be converted to after radiofrequency signal through data feedback channel
Upload；
RFoG optical nodes, for being uploaded after the radiofrequency signal from the cable modem is converted into optical signal；
Up optical receiver, for being uploaded after originally the optical signal of the RFoG optical nodes is converted into radiofrequency signal in the future；
Cable modem termination system, the radiofrequency signal for originally described up optical receiver in the future are converted into ether
Net signal is sent to Metropolitan Area Network (MAN)；
It is characterized in that：
The repeater described in claim 1, institute are provided between the up optical receiver and the RFoG optical nodes
Stating repeater includes：Optical transmitting set, RF blenders and Optical Receivers, the output end of the Optical Receivers connect the RF and mixed
The receiving terminal of clutch, the output end of the RF blenders connect the receiving terminal of the optical transmitting set, and Optical Receivers includes light splitting
Device, optical receiver, RF attenuators, the output end of the optical splitter connect the receiving terminal of the optical receiver, the optical receiver
Output end connect the receiving terminals of the RF attenuators, the output end of the RF attenuators connects the reception of the RF blenders
End, the output end of the optical transmitting set connect the up optical receiver, and the receiving terminal of the optical splitter connects the RFoG light
Node, each RFoG optical nodes are connected with a cable modem, and up-link also includes control unit, institute
State control unit and connect the cable modem and the RF attenuators respectively, described control unit can be by the cable
The radiofrequency signal of modem is controlled into different data feedback channels, and described control unit can be changed by the RF attenuators
The attenuation of the Optical Receivers, described control unit can be by the RF attenuators come detection signal-to-noise ratio.
The RFOG optical nodes use Distributed Feedback Laser.
A kind of repeater applied to up-link, including：Optical transmitting set, RF blenders and Optical Receivers, the light
The output end of receiving module connects the receiving terminal of the RF blenders, and the output end of the RF blenders connects the optical transmitting set
Receiving terminal, it is characterised in that：Optical Receivers includes optical splitter, optical receiver, RF attenuators, the output end of the optical splitter
The receiving terminal of the optical receiver is connected, the output end of the optical receiver connects the receiving terminal of the RF attenuators, the RF
The output end of attenuator connects the receiving terminal of the RF blenders, and the RF attenuators have electricly connected control unit, the control
Unit processed can change the attenuation of the Optical Receivers.
A kind of method that optical beat disturbs in elimination up-link, it is characterised in that：Optical Receivers is obtained to adjust with cable
The topological structure of modulator-demodulator, the data feedback channel of cable modem, control unit inspection are controlled in units of RFoG optical nodes
Signal to noise ratio when RFoG optical nodes upload optical signal is surveyed to change to determine to produce the optical node combination of optical beat interference；Control
The optical node combination that optical beat interference can be produced in each Optical Receivers is assigned in same data feedback channel by unit.
Further, detection produces the RFoG optical nodes combination of optical beat interference and distribution produces the light of optical beat interference
The step of combination of nodes, is as follows：
Step（1）：RFoG optical nodes are connected to the input port of the optical splitter of each Optical Receivers, control unit one by one
The attenuator of Optical Receivers is controlled one by one, is changed the attenuation of Optical Receivers, is obtained Optical Receivers and cable modulatedemodulate
The topological structure of device is adjusted, the data feedback channel of cable modem is controlled in units of RFoG optical nodes；
Step（2）：An Optical Receivers is selected to select a data feedback channel as first as current Optical Receivers
Data feedback channel, control unit control the RFoG optical nodes for being connected to current Optical Receivers into the first data feedback channel, remaining
Data feedback channel is idle data feedback channel；
Step（3）：An idle data feedback channel is selected to be selected one by one in current Optical Receivers as current data feedback channel
A RFoG optical node as current optical node, control unit controls current optical node into current data feedback channel, control
Unit controls RF attenuators to detect current optical node with remaining RFoG optical nodes in current Optical Receivers with the presence or absence of letter
Make an uproar than deterioration, if detecting, signal to noise ratio deteriorates, and control unit controls the RFoG optical nodes that signal to noise ratio deterioration occurs to current
In data feedback channel, have detected that the RFoG light section that signal to noise ratio deterioration occurs is not re-used as current optical node, reselection others one
Individual idle data feedback channel selects in current Optical Receivers one signal to noise ratio deterioration does not occur as current data feedback channel
For RFoG optical nodes as current optical node, control unit, which controls current optical node into current data feedback channel, continues detection currently
Remaining RFoG optical nodes deteriorate with current optical node with the presence or absence of signal to noise ratio in Optical Receivers；If it is bad to be not detected by signal to noise ratio
Change, directly select another idle data feedback channel as current data feedback channel, and select in current Optical Receivers one not send out
The control of current optical node is arrived current data feedback channel by the RFoG optical nodes of raw signal to noise ratio deterioration as current optical node, control unit
In continue to detect remaining RFoG optical nodes with current optical node with the presence or absence of signal to noise ratio deterioration, until in current Optical Receivers
All RFoG optical nodes be all assigned in different data feedback channels；
Step（4）：Repeat step（2）、（3）Until the RFoG optical nodes of all Optical Receivers be all assigned to it is different
In data feedback channel.
Further, all RFoG optical nodes in an Optical Receivers carry out optical beat Interference Detection and
When distribution produces the optical node combination of optical beat interference, if data feedback channel is all assigned RFoG optical nodes, first up logical
Also have at least two signal to noise ratio deterioration RFoG optical nodes do not occur in road, the data feedback channel that selection possesses minimum RFoG optical nodes is made
For in current data feedback channel, signal to noise ratio deterioration RFoG optical nodes will not occur one by one for control unit one by one as on current optical node
Pass in current data feedback channel, control unit controls RF attenuators to detect the remaining RFoG light sections that signal to noise ratio deterioration does not occur
Point deteriorates with current optical node with the presence or absence of signal to noise ratio, detects that signal to noise ratio deteriorates, then the RFoG light of signal to noise ratio deterioration will occur
Node control reselects the data feedback channel for possessing minimum RFoG optical nodes as current up logical into current data feedback channel
Road, have detected that the RFoG light section that signal to noise ratio deterioration occurs is not re-used as current optical node, and select next noise not to occur
RFoG optical nodes than deterioration continue the control of current optical node into current data feedback channel as current optical node, control unit
Remaining RFoG optical nodes are detected to deteriorate with the presence or absence of signal to noise ratio with current optical node；It is on the contrary then reselect and possess minimum RFoG
The data feedback channel of optical node selects next RFoG optical node conducts that signal to noise ratio deterioration does not occur as current data feedback channel
Current optical node, control unit current optical node is controlled continue into current data feedback channel to detect remaining RFoG optical nodes with
Current optical node deteriorates with the presence or absence of signal to noise ratio, until all RFoG optical nodes in an Optical Receivers are all assigned to not
In same data feedback channel.
Further, it is right after the RFoG optical nodes in all Optical Receivers are all assigned to different data feedback channels
All RFoG optical nodes in any two difference data feedback channel in any one Optical Receivers are interchangeable so that this is any
RFoG optical node quantity in two different data feedback channels tends to be balanced.
It is an advantage of the invention that：The up-link of the DOCSIS3.0 system above of the present invention, is realized in DOCSIS3.0
Optical signal is relayed in the up-link of system above, solves the problems, such as luminous power deficiency in up-link, while in
After carrying out mixing reception using optical splitter in device, without a large amount of optical receivers are used, cost and Overall Power Consumption are saved, has been advantageous to
Promote, eliminate the method that optical beat disturbs in the up-link of DOCSIS3.0 system above, avoid optical beat interference, improve
Upload link signal to noise ratio.
Brief description of the drawings
Fig. 1 is application schematic diagram of the existing RFoG optical nodes in the up-link of DOCSIS2.0 systems；
Fig. 2 is the wavelength of transmitted light test data table of the RFoG optical nodes in the embodiment of the present invention；
Fig. 3 is the tables of data after the RFoG optical nodes in the embodiment of the present invention are redistributed；
The repeater of Fig. 4 present invention has the structural representation of 4 Optical Receivers；
Fig. 5 is the application schematic diagram on the up-link road of the DOCSIS3.0 systems relayed to optical signal of invention.
Embodiment
In present embodiment, based on the situation of DOCSIS3.0 technologies come specifically describe the present invention repeater, uplink
Road and the method for eliminating optical beat interference in up-link, the CMTS Typical Dispositions for supporting DOCSIS3.0 are that 16 descending RF lead to
Road, there is 800MBPS downlink bandwidth, 4 up RF passages US1, US2, US3, US4, there is 160MBPS upstream bandwidth.
See Fig. 5, the up-link of the DOCSIS3.0 systems of the present embodiment contains modulation /demodulation terminal system 1, up light
Receiver 2, RFoG optical nodes 3, cable modem 4, repeater 5, control unit 6.
In the present embodiment, RFOG optical nodes use Distributed Feedback Laser, two Distributed Feedback Lasers（Distributed Feedback
Laser, i.e. distributed feedback laser）Wavelength difference when being less than 0.2nm OBI to the obvious effect of signal to noise ratio, this reality
Apply the 32 RFoG optical nodes that contain in example, Fig. 2 is the wavelength of transmitted light data of 32 RFoG optical nodes, wavelength of transmitted light number
Sorted according to wavelength is pressed；OBI RFoG optical nodes ID combinations can be produced by also being analyzed in Fig. 2 form.
See Fig. 4, the repeater in embodiments of the present invention, including：Optical transmitting set 7, RF blenders 8 and Optical Receivers
9, the output end 10 of Optical Receivers connects the receiving terminal 11 of RF blenders, and the output end 12 of RF blenders connects optical transmitting set
Receiving terminal 13, Optical Receivers 9 include optical splitter 14, optical receiver 15, RF attenuators 16, and the output end 17 of optical splitter connects light
The receiving terminal 18 of receiver, the output end 19 of optical receiver connect the receiving terminal 20 of RF attenuators, the output end 23 of RF attenuators
The receiving terminal 11 of RF blenders is connected, RF attenuators 16 are connected with control unit 6, and control unit 6 can change Optical Receivers 9
Attenuation, the repeater in Fig. 4 has 4 Optical Receivers 9, and Optical Receivers 9 meets 3 32 using 8 mixed 1 structure
RFoG input, it is corresponding to change 4 mixed 1 or 16 mixed 1 Optical Receivers 9 into, set as long as each Optical Receivers 9 is corresponding
One optical receiver, without a large amount of optical receivers are used, cost and Overall Power Consumption are saved, has been advantageous to promote.
See Fig. 4, Fig. 5, the up-link of DOCSIS3.0 systems is whole from cable modem 4 to cable modem
Ethernet signal from user terminal is converted to radiofrequency signal by the signal transmission link of end system 1, cable modem 4,
Between RFoG optical nodes 3 and cable modem 4, 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 not interfere with each other, and upstream radio-frequency signal uploads through data feedback channel, RFoG optical nodes
Upstream radio-frequency signal is changed into optical signal by 3 to be sent, up optical receiver 2 by the optical signal from RFoG optical nodes 3 again
Secondary to go back to radiofrequency signal, upstream radio-frequency signal is converted into ethernet signal and is sent to by last cable modem termination system 4
Metropolitan Area Network (MAN).The signal conversion of up-link is 5 State Transferrings：Ethernet-radio frequency-light-radio frequency-Ethernet.
In the up-link of the DOCSIS3.0 systems of the present embodiment, up optical receiver 2 and RFoG optical nodes 3 it
Between repeater 5 is set, repeater 5 includes：Optical transmitting set 7, RF blenders 8 and Optical Receivers 9, the output end of Optical Receivers
The receiving terminal 11 of 10 connection RF blenders, the output end 12 of RF blenders connect the receiving terminal 13 of optical transmitting set, Optical Receivers 9
Including optical splitter 14, optical receiver 15, RF attenuators 16, the output end 17 of optical splitter connects the receiving terminal 18 of optical receiver, light
The output end 19 of receiver connects the receiving terminal 20 of RF attenuators, and the output end 23 of RF attenuators connects the receiving terminal of RF blenders
11, the output end 21 of optical transmitting set connects up optical receiver 2, and the receiving terminal 22 of optical splitter connects RFoG optical nodes 3, each
RFoG optical nodes 3 are connected with a cable modem 4, and control unit 6 distinguishes connecting cable modem 4 and RF decay
Device 16, control unit 6 can control the radiofrequency signal of cable modem 4 into different data feedback channels, the energy of control unit 6
RF attenuators 16 are enough controlled to change the attenuation of Optical Receivers, control unit 6 can detect noise by RF attenuators 16
Than by the setting of repeater, realizing and optical signal being relayed in the up-link of DOCSIS3.0 systems, solve
In up-link the problem of luminous power deficiency.
See Fig. 4, when up-link is just upper electric, the radiofrequency signal of all cable modems 4 is likely distributed in difference
Data feedback channel in, start freely reach the standard grade.Now due to the influence of OBI phenomenons, the up of some cable modems 4 is had
Signal to noise ratio is very poor, and now control unit starts to intervene work.
Cable modem termination system is Cable Modem Terminal Systems, is come hereafter abbreviated with CMTS
Represent；Cable modem is Cable Modem, is represented hereafter abbreviated with CM；Optical beat interference is Optical Beat
Interference, represented hereafter abbreviated with OBI.
In order to solve the problems, such as OBI, it is necessary to the equation of light of the up-link using the elimination DOCSIS3.0 system above of the present invention
The method disturbed is patted dry, the topological structure of Optical Receivers and cable modem is obtained, is controlled in units of RFoG optical nodes
The data feedback channel of cable modem, signal to noise ratio when control unit detection RFoG optical nodes upload optical signal change to determine
The optical node combination of optical beat interference will be produced；Control unit will can produce the light of optical beat interference in each Optical Receivers
Combination of nodes is assigned in same data feedback channel.
The side that optical beat disturbs in the up-link for the DOCSIS3.0 systems that the elimination of the present invention is relayed to optical signal
Method, detection produces the RFoG optical nodes combination of optical beat interference and distribution produces the optical node combination of optical beat interference, including
Preparation process is specific：
Preparation process：Eliminate OBI：Control unit controls all CM to be all limited in data feedback channel US1, but uploads band
Width can only use a quarter, but OBI is no longer present, and all CM can be communicated without packet loss, and all CM are operated in US1,
The waste of other 3 data feedback channels will then be caused, efficiency is low, and preparation process 1 is in order to facilitate subsequent control.
Obtain the topological structure between CM and Optical Receivers：Control unit by controlling the RF of Optical Receivers to decline one by one
Subtract device, come the attenuation for increasing or reducing Optical Receivers, the increase or reduction that up-link will be caused to decay, DOCSIS's is upper
Line link is very sensitive to decaying, and CM launching electrical level could be made that quick response.Control unit is easy to the management letter from CMTS
In breath, these CM are obtained by gathering the CM variable quantity of launching electrical level.By this step, control unit obtains all CM and light
The corresponding relation of receiving module, RFoG optical nodes are uncontrolled, and RFoG optical nodes find that CM has radio frequency up, turn on laser
Device is launched, therefore it is actually control CM to data feedback channel into data feedback channel that control unit 10, which controls RFoG optical nodes, completes to prepare
Start the data feedback channel of the control CM in units of optical node after step 1, preparation process 2, each optical node can select US
Passage（Optional US1, US2, US3, US4）.
Detection produces the RFoG optical nodes combination of optical beat interference and distribution produces the optical node combination of optical beat interference
The step of it is as follows：
Step（1）：RFoG optical nodes are connected to the input port of the optical splitter of each Optical Receivers, control unit one by one
The attenuator of Optical Receivers is controlled one by one, is changed the attenuation of Optical Receivers, is obtained Optical Receivers and cable modulatedemodulate
The topological structure of device is adjusted, the data feedback channel of cable modem is controlled in units of RFoG optical nodes；
Step（2）：An Optical Receivers is selected to select a data feedback channel as first as current Optical Receivers
Data feedback channel, control unit control the RFoG optical nodes for being connected to current Optical Receivers into the first data feedback channel, remaining
Data feedback channel is idle data feedback channel；
Step（3）：An idle data feedback channel is selected to be selected one by one in current Optical Receivers as current data feedback channel
A RFoG optical node as current optical node, control unit controls current optical node into current data feedback channel, control
Unit controls RF attenuators to detect current optical node with remaining RFoG optical nodes in current Optical Receivers with the presence or absence of letter
Make an uproar than deterioration, if detecting, signal to noise ratio deteriorates, and control unit controls the RFoG optical nodes that signal to noise ratio deterioration occurs to current
In data feedback channel, have detected that the RFoG light section that signal to noise ratio deterioration occurs is not re-used as current optical node, reselection others one
Individual idle data feedback channel selects in current Optical Receivers one signal to noise ratio deterioration does not occur as current data feedback channel
For RFoG optical nodes as current optical node, control unit, which controls current optical node into current data feedback channel, continues detection currently
Remaining RFoG optical nodes deteriorate with current optical node with the presence or absence of signal to noise ratio in Optical Receivers；If it is bad to be not detected by signal to noise ratio
Change, directly select another idle data feedback channel as current data feedback channel, and select in current Optical Receivers one not send out
The control of current optical node is arrived current data feedback channel by the RFoG optical nodes of raw signal to noise ratio deterioration as current optical node, control unit
In continue to detect remaining RFoG optical nodes with current optical node with the presence or absence of signal to noise ratio deterioration, until in current Optical Receivers
All RFoG optical nodes be all assigned in different data feedback channels；
Step（4）：Repeat step（2）、（3）Until the RFoG optical nodes of all Optical Receivers be all assigned to it is different
In data feedback channel.
Detection produces the RFoG optical nodes combination of optical beat interference and distribution produces the optical node combination of optical beat interference
Other steps borrow Optical Receivers A exemplified by illustrate.
Optical Receivers A access RFoG optical node numberings are 1 ~ 8, because each RFoG optical nodes are connected to a CM, institute
With CM numberings and 1 ~ 8, all CM data feedback channels are US1, and these CM are formed into an inventory, are easy to description CM to be moved from inventory
The operation removed.
First RFoG optical node in inventory is chosen, the data feedback channel of CM corresponding to first RFoG optical node is changed into
One idle passage US2, and control unit detects the up signal to noise ratio situation of change of other CM in inventory.If it find that inventory
In the deterioration of some CM signal to noise ratio just indicate OBI generation, the CM of these generation signal to noise ratio deteriorations is all moved into idle channel
US2；If not finding that signal to noise ratio deterioration means that current CM gets along well any same clusters of CM, by current CM be assigned to after idle channel from
Removed in inventory.
After 1st detection signal-to-noise ratio deterioration, totally 3 nodes will be assigned to US2 to the optical node 1,7,8 in Fig. 2, and other 5
Individual node is still in US1.
After 2nd detection signal-to-noise ratio deterioration, the optical node 2 in Fig. 2 will be assigned to US3, and other 4 nodes are still in
US1, optical node 2 get along well inventory in other optical nodes produce OBI.
After 3rd detection signal-to-noise ratio deterioration, totally 3 nodes will be assigned to US4 to the optical node 3,4,6 in Fig. 2, only save
Point 5 is stayed in US1.
Deteriorated by 3 detection signal-to-noise ratios, all RFoG optical nodes in Optical Receivers A have all been allocated.
All RFoG optical nodes in an Optical Receivers carry out optical beat Interference Detection and distribution produce
During the optical node combination of optical beat interference, if data feedback channel is all assigned RFoG optical nodes, also have in first data feedback channel
At least two signal to noise ratio deterioration RFoG optical nodes do not occur, and the data feedback channel that selection possesses minimum RFoG optical nodes is used as on current
In row of channels, control unit will not occur signal to noise ratio deterioration RFoG optical nodes and be uploaded to currently as current optical node one by one one by one
In data feedback channel, control unit control RF attenuators detect the remaining RFoG optical nodes that signal to noise ratio deterioration does not occur with it is current
Optical node deteriorates with the presence or absence of signal to noise ratio, detects that signal to noise ratio deteriorates, then controls the RFoG optical nodes that signal to noise ratio deterioration occurs
Into current data feedback channel, the data feedback channel for possessing minimum RFoG optical nodes is reselected as current data feedback channel, has been detected
To occur signal to noise ratio deterioration RFoG light section be not re-used as current optical node, and select it is next do not occur signal to noise ratio deterioration
For RFoG optical nodes as current optical node, control unit, which controls current optical node into current data feedback channel, continues detection remainder
RFoG optical nodes and current optical node with the presence or absence of signal to noise ratio deterioration；It is on the contrary then reselect and possess minimum RFoG optical nodes
Data feedback channel selects next RFoG optical nodes that signal to noise ratio deterioration does not occur as current light section as current data feedback channel
Point, control unit, which controls current optical node into current data feedback channel, to be continued to detect remaining RFoG optical nodes and current light section
Point deteriorates with the presence or absence of signal to noise ratio, until all RFoG optical nodes in an Optical Receivers be all assigned to it is different up
In passage.
In Optical Receivers B, after the 1st detection signal-to-noise ratio deterioration, totally 1 optical node will be divided the optical node 9 in Fig. 2
US2 is fitted on, other 7 nodes are still in US1, and other optical nodes produce OBI in the discord inventory of optical node 9.
After 2nd detection signal-to-noise ratio deterioration, totally 2 optical nodes will be assigned to US3 to the optical node 10,14 in Fig. 2, other
5 nodes are still in US1.
After 3rd detection signal-to-noise ratio deterioration, the optical node 12,13,15 in Fig. 2 will be assigned to US4, other 2 nodes
It is still in US1.
Now passage all takes, and selects US2 to be placed on optical node 16 and optical node 9 as current data feedback channel
In one passage, other optical nodes in inventory of getting along well of optical node 16 produce OBI, and remaining optical node 11 is also got along well other in inventory
Optical node produces OBI, is retained in US1.
By the method same with RFoG optical nodes in processing Optical Receivers A, by the RFoG in Optical Receivers B, C, D
Optical node is assigned in different data feedback channels, in order to realize the equilibrium of data feedback channel, in all Optical Receivers
After RFoG optical nodes are all assigned to different data feedback channels, to any two difference data feedback channel in any one Optical Receivers
Interior all RFoG optical nodes are interchangeable so that the RFoG optical node quantity in any two difference data feedback channel tends to be equal
Weighing apparatus.
In the art at present, it is suitable for DOCSIS3.1 standards, DOCSIS3.1 standards can make the present invention's
Application prospect is wider, because DOCSIS3.1 supports higher upstream bandwidth.List is caused in single data feedback channel RFoG optical nodes
The problem of RFoG optical nodes of individual data feedback channel are crowded, DOCSIS3.1 single data feedback channel possess bigger bandwidth, and this will make
Congested problem seems less serious, and following more than the DOCSIS3.1 standards can be equally applicable.
Claims (6)
1. a kind of up-link, including be connected：
Cable modem, for the ethernet signal from user terminal to be converted to after radiofrequency signal through data feedback channel
Pass；
RFoG optical nodes, for being uploaded after the radiofrequency signal from the cable modem is converted into optical signal；
Up optical receiver, for being uploaded after originally the optical signal of the RFoG optical nodes is converted into radiofrequency signal in the future；
Cable modem termination system, the radiofrequency signal for originally described up optical receiver in the future are converted into Ethernet letter
Number it is sent to Metropolitan Area Network (MAN)；
It is characterized in that：
Repeater is provided between the up optical receiver and the RFoG optical nodes, the repeater includes：Light is launched
Device, RF blenders and Optical Receivers, the output end of the Optical Receivers connect the receiving terminal of the RF blenders, the RF
The output end of blender connects the receiving terminal of the optical transmitting set, and Optical Receivers includes optical splitter, optical receiver, RF decay
Device, the output end of the optical splitter connect the receiving terminal of the optical receiver, and the output end of the optical receiver connects the RF
The receiving terminal of attenuator, the output ends of the RF attenuators connect the receiving terminal of the RF blenders, the optical transmitting set it is defeated
Go out end and connect the up optical receiver, the receiving terminal of the optical splitter connects the RFoG optical nodes, each RFoG light
Node is connected with a cable modem, and up-link also includes control unit, and described control unit connects respectively
The cable modem and the RF attenuators, described control unit can believe the radio frequency of the cable modem
Into different data feedback channels, described control unit can change the Optical Receivers by the RF attenuators and decline for number control
Decrement, described control unit can be by the RF attenuators come detection signal-to-noise ratio.
A kind of 2. up-link according to claim 1, it is characterised in that：The RFOG optical nodes use Distributed Feedback Laser.
3. a kind of repeater of up-link applied to described in claim 1, including：Optical transmitting set, RF blenders and light connect
Module is received, the output end of the Optical Receivers connects the receiving terminal of the RF blenders, and the output end of the RF blenders connects
Connect the receiving terminal of the optical transmitting set, it is characterised in that：Optical Receivers includes optical splitter, optical receiver, RF attenuators, described
The output end of optical splitter connects the receiving terminal of the optical receiver, and the output end of the optical receiver connects the RF attenuators
Receiving terminal, the output end of the RF attenuators connect the receiving terminal of the RF blenders, and the RF attenuators have electricly connected control
Unit processed, described control unit can change the attenuation of the Optical Receivers.
A kind of 4. method for the optical beat interference for eliminating the up-link described in claim 1, it is characterised in that：Light is obtained to connect
The topological structure of module and cable modem is received, the up logical of cable modem is controlled in units of RFoG optical nodes
Road, signal to noise ratio when control unit detection RFoG optical nodes upload optical signal change to determine to produce the light of optical beat interference
Combination of nodes；The optical node combination that optical beat interference can be produced in each Optical Receivers is assigned on same by control unit
In row of channels；
Detection produces the RFoG optical nodes combination of optical beat interference and distributes the step for the optical node combination for producing optical beat interference
It is rapid as follows：
Step（1）：RFoG optical nodes are connected to the input port of the optical splitter of each Optical Receivers one by one, control unit is one by one
The attenuator of Optical Receivers is controlled, changes the attenuation of Optical Receivers, obtains Optical Receivers and cable modem
Topological structure, in units of RFoG optical nodes control cable modem data feedback channel；
Step（2）：An Optical Receivers is selected to select a data feedback channel up as first as current Optical Receivers
Passage, control unit control the RFoG optical nodes for being connected to current Optical Receivers into the first data feedback channel, and remaining is up
Passage is idle data feedback channel；
Step（3）：An idle data feedback channel is selected to select one in current Optical Receivers one by one as current data feedback channel
Individual RFoG optical nodes control current optical node into current data feedback channel as current optical node, control unit, control unit
Control RF attenuators whether there is signal to noise ratio to detect current optical node with remaining RFoG optical nodes in current Optical Receivers
Deterioration, if detecting, signal to noise ratio deteriorates, and control unit controls the RFoG optical nodes that signal to noise ratio deterioration occurs to current up
In passage, have detected that the RFoG light section that signal to noise ratio deterioration occurs is not re-used as current optical node, reselection one sky of others
Not busy data feedback channel selects the RFoG light that signal to noise ratio deterioration does not occur in current Optical Receivers as current data feedback channel
As current optical node, control unit controls current optical node into current data feedback channel to be continued to detect current light-receiving node
Remaining RFoG optical nodes deteriorate with current optical node with the presence or absence of signal to noise ratio in module；If signal to noise ratio deterioration is not detected by, directly
Selecting selects another idle data feedback channel as current data feedback channel, and selects in current Optical Receivers one noise does not occur
RFoG optical nodes than deterioration continue the control of current optical node into current data feedback channel as current optical node, control unit
Detect remaining RFoG optical nodes to deteriorate with the presence or absence of signal to noise ratio with current optical node, until all in current Optical Receivers
RFoG optical nodes are all assigned in different data feedback channels；
Step（4）：Repeat step（2）、（3）Until the RFoG optical nodes of all Optical Receivers be all assigned to it is different up
In passage.
5. the method for the optical beat interference according to claim 4 for eliminating up-link, it is characterised in that：When to a light
All RFoG optical nodes in receiving module carry out optical beat Interference Detection and distribution produce the optical node of optical beat interference
During combination, if data feedback channel is all assigned RFoG optical nodes, also have at least two noise does not occur in first data feedback channel
Than deteriorating RFoG optical nodes, selection possesses the data feedback channels of minimum RFoG optical nodes as in current data feedback channel, control unit
Signal to noise ratio deterioration RFoG optical nodes will not occur one by one to upload in current data feedback channel as current optical node one by one, control is single
Member control RF attenuators whether there is letter to detect the remaining RFoG optical nodes that signal to noise ratio deterioration does not occur with current optical node
Make an uproar than deterioration, detect that signal to noise ratio deteriorates, then control the RFoG optical nodes that signal to noise ratio deterioration occurs into current data feedback channel,
The data feedback channel for possessing minimum RFoG optical nodes is reselected as current data feedback channel, has detected that and signal to noise ratio deterioration occurs
RFoG light section is not re-used as current optical node, and selects next RFoG optical nodes that signal to noise ratio deterioration does not occur as current light
Node, control unit, which controls current optical node into current data feedback channel, to be continued to detect remaining RFoG optical nodes and current light
Node deteriorates with the presence or absence of signal to noise ratio；It is on the contrary then reselect and possess the data feedback channels of minimum RFoG optical nodes as current up
Passage, and select next RFoG optical nodes that signal to noise ratio deterioration does not occur as current optical node, control unit is by current light
It is bad with the presence or absence of signal to noise ratio with current optical node that node control continues to detect remaining RFoG optical nodes into current data feedback channel
Change, until all RFoG optical nodes in an Optical Receivers are all assigned in different data feedback channels.
6. the method for the optical beat interference according to claim 5 for eliminating up-link, it is characterised in that：In all light
After RFoG optical nodes in receiving module are all assigned to different data feedback channels, to any two in any one Optical Receivers
All RFoG optical nodes in different data feedback channels are interchangeable so that the RFoG light sections in any two difference data feedback channel
Point quantity tends to be balanced.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098592A (en) * | 2009-12-15 | 2011-06-15 | 美国博通公司 | Optical network unit for transmitting radiofrequency signal and Ethernet passive optical network system |
| CN205304806U (en) * | 2015-11-16 | 2016-06-08 | 无锡路通视信网络股份有限公司 | Up link system of repeater, applied this repeater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098592A (en) * | 2009-12-15 | 2011-06-15 | 美国博通公司 | Optical network unit for transmitting radiofrequency signal and Ethernet passive optical network system |
| CN205304806U (en) * | 2015-11-16 | 2016-06-08 | 无锡路通视信网络股份有限公司 | Up link system of repeater, applied this repeater |
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