CN105306144A - Repeater, uplink applying same and method for removing optical beat interference in uplink - Google Patents
Repeater, uplink applying same and method for removing optical beat interference in uplink Download PDFInfo
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- CN105306144A CN105306144A CN201510784658.0A CN201510784658A CN105306144A CN 105306144 A CN105306144 A CN 105306144A CN 201510784658 A CN201510784658 A CN 201510784658A CN 105306144 A CN105306144 A CN 105306144A
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Abstract
The invention provides an uplink which can solve the problem of optical attenuation in the uplink and comprises a cable modem, an RFoG optical node, an uplink optical receiver, a cable modem terminal system and a repeater. Meanwhile, the invention also provides the repeater applying the uplink. The repeater comprises an optical transmitter, an RF mixer and an optical reception module; and the optical reception module comprises an optical splitter, an optical receiver and an RF attenuator. In addition, the invention also provides a method for removing optical beat interference in the uplink.
Description
Technical field
The present invention relates to radio and television two-way communication field, especially relate to the repeater being applied to more than DOCSIS3.0 system, the up link applying this repeater and eliminate its optical beat interference method.
Background technology
dOCSIS(DataOverCableServiceInterfaceSpecifications, data over cable service interface specification), be one by wire cable normal structure CableLabs formulate international standard, its excellent QoS(QualityofService, service quality) by the industry speak approvingly of.The nucleus equipment of DOCSIS is CMTS(CableModemTerminalSystems cable modem termination system) and CM(CableModem cable modem), CMTS is the local side apparatus of DOCSIS system, and CM is the terminal equipment of DOCSIS system.In general CMTS is installed in machine room, and CM is installed in user side (being generally arranged in user family).Between CMTS to CM, bidirectional communication link is divided into down link and up link, and down link refers to the link from CMTS to CM, otherwise is up link.
Along with light entering and copper back constantly advances, the continuous refinement of optical node, optical node constantly advances to user side, quantity constantly increases, and causes trunk optical fiber demand constantly to increase, and the up light of machine room is received and also constantly increased.Receive and the Cost Problems of backbone optical cable to solve up light, RFOG(RFoverGlass in recent years, optical fiber radio frequency transmits) technology is widely applied, and makes " up optical-fiber network " can adopt the tree structure similar with " descending optical-fiber network ".RFOG is SCTE(SocietyofCableTelevisionEngineers American Cable TV IEEE) technical specification formulating, the up light emission module in RFOG optical node can open and close laser according to the uplink transmission power of CM.In the DOCSIS2.0 epoch, its upper and lower provisional capital is single channel, down channel is called DS, up channel is called US, upward signal control technology main flow is TDM(time division multiplexing), that is in the same time, " in the broadcast domain of same CMTS " only has at most a CM to transmit, and just represents in the same time to only have at most the up optical sender of an optical node in work.Use optical mixer to become a road to deliver to machine room the fiber mix from multiple optical node with regard to being easy to like this, the up light inside machine room is received quantity and is also greatly reduced, and cost obviously reduces.Fig. 1 is the typical apply of RFOG optical node in DOCSIS2.0 up link.The pattern that the common optical mixer of this direct use carries out mixing is called " directly mixed pattern ".
Under directly mixing pattern, optical link decay and splitting ratio have direct relation.In recent years along with the refinement of optical node, splitting ratio is increasing, make the light decay of whole link increasing, the luminous power of arrival machine room starts the lower limit close to optical receiver receiving ability, even have influence on the up signal to noise ratio of link, if notification number is provide a kind of uplink multi-path light mixing relay station in the Chinese utility model patent of 201270573Y, by the method that light signal is received mixing by optical splitter and then sent, improve the luminous power of up link, 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 employs channel bundled technology, allow " in the broadcast domain of same CMTS " multiple up radio-frequency channel concurrent, although each passage still uses TDM technology, but work alone mutually between these radio-frequency channels.This means have multiple CM to transmit in " in the same time " simultaneously, and because there is light mixing in uplink multi-path light mixing relay station, so there is the interference of OBI(OpticalBeatInterference optical beat) possibility that occurs, OBI is because the wavelength of two bundle laser is too close, the interference produced after converging, link SNR(SignalNoiseRatio signal to noise ratio will be caused) serious deterioration, it is a kind of common light interference phenomenon, although the frequency of those CM launched on radio frequency is separated simultaneously, it radio-frequency channel is frequency division multiplexing, but it may be identical for being truly had by the optical maser wavelength after the modulation of RFOG optical node, they arrive the same up smooth time receiving of machine room after the optical splitter mixing of repeater, error code just creates at once, OBI phenomenon that Here it is.
Summary of the invention
For the problems referred to above, the invention provides a kind of up link, relaying can be carried out to light signal, solve the problem of optical attenuation in up link, additionally provide the repeater being applied to up link simultaneously, also provided is the method eliminating optical beat interference in up link.
A kind of up link, comprises and being connected:
Cable modem, uploads through data feedback channel after the ethernet signal from user side is converted to radiofrequency signal;
RFoG optical node, uploads after the radiofrequency signal from described cable modem is converted into light signal;
Up optical receiver, uploads after the light signal of described RFoG optical node is converted into radiofrequency signal from the beginning in the future;
Cable modem termination system, in the future from the beginning the radiofrequency signal of described up optical receiver be converted into ethernet signal and be sent to metropolitan area network;
It is characterized in that:
Repeater according to claim 1 is provided with between described up optical receiver and described RFoG optical node, described repeater comprises: optical transmitting set, RF blender and Optical Receivers, the output of described Optical Receivers connects the receiving terminal of described RF blender, the output of described RF blender connects the receiving terminal of described optical transmitting set, Optical Receivers comprises optical splitter, optical receiver, RF attenuator, the output of described optical splitter connects the receiving terminal of described optical receiver, the output of described optical receiver connects the receiving terminal of described RF attenuator, the output of described RF attenuator connects the receiving terminal of described RF blender, the output of described optical transmitting set connects described up optical receiver, the receiving terminal of described optical splitter connects described RFoG optical node, each described RFoG optical node is connected with a described cable modem, up link also comprises control unit, described control unit connects described cable modem and described RF attenuator respectively, the radiofrequency signal of described cable modem can control in different data feedback channel by described control unit, described control unit can change the attenuation of described Optical Receivers by described RF attenuator, described control unit can carry out detection signal-to-noise ratio by described RF attenuator.
Described RFOG optical node adopts Distributed Feedback Laser.
A kind of repeater being applied to up link, comprise: optical transmitting set, RF blender and Optical Receivers, the output of described Optical Receivers connects the receiving terminal of described RF blender, the output of described RF blender connects the receiving terminal of described optical transmitting set, it is characterized in that: Optical Receivers comprises optical splitter, optical receiver, RF attenuator, the output of described optical splitter connects the receiving terminal of described optical receiver, the output of described optical receiver connects the receiving terminal of described RF attenuator, the output of described RF attenuator connects the receiving terminal of described RF blender, described RF attenuator has electricly connected control unit, described control unit can change the attenuation of described Optical Receivers.
A kind of method eliminating optical beat interference in up link, it is characterized in that: the topological structure obtaining Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node, the control unit signal to noise ratio change detected when RFoG optical node uploads light signal determines to produce the optical node combination of optical beat interference; The optical node combination that can produce optical beat interference in each Optical Receivers is assigned in same data feedback channel by control unit.
Further, the step of the optical node combination that the RFoG optical node that detection produces optical beat interference combines and distributes the interference of generation optical beat is as follows:
Step (1): input port RFoG optical node being connected to one by one the optical splitter of each Optical Receivers, control unit controls the attenuator of Optical Receivers one by one, change the attenuation of Optical Receivers, obtain the topological structure of Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node;
Step (2): select an Optical Receivers as current Optical Receivers, select a data feedback channel as the first data feedback channel, the RFoG optical node being connected to current Optical Receivers controls in the first data feedback channel by control unit, and all the other data feedback channels are idle data feedback channel;
Step (3): select an idle data feedback channel as current data feedback channel, select in current Optical Receivers RFoG optical node as current optical node one by one, current optical node controls in current data feedback channel by control unit, control unit control RF attenuator detects RFoG optical node remaining in current optical node and current Optical Receivers and whether there is signal to noise ratio deterioration, if signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs controls in current data feedback channel by control unit, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, select other an idle data feedback channel as current data feedback channel again, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect RFoG optical node remaining in current Optical Receivers and whether current optical node exists signal to noise ratio deterioration by control unit, if signal to noise ratio deterioration do not detected, another idle data feedback channel of direct selection is as current data feedback channel, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in current Optical Receivers are all assigned in different data feedback channels by control unit,
Step (4): repeat step (2), (3) until the RFoG optical node of all Optical Receivers is all assigned in different data feedback channels.
Further, when all RFoG optical nodes in an Optical Receivers are carried out optical beat Interference Detection and distribution produce optical beat interference optical node combination time, if data feedback channel is all assigned with RFoG optical node, also have at least two signal to noise ratio deterioration RFoG optical node does not occur in first data feedback channel, select the data feedback channel having minimum RFoG optical node as in current data feedback channel, signal to noise ratio deterioration RFoG optical node will be there is not one by one and upload in current data feedback channel as current optical node one by one in control unit, control unit control RF attenuator detects the remaining RFoG optical node that signal to noise ratio deterioration does not occur and whether current optical node exists signal to noise ratio deterioration, signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs is controlled in current data feedback channel, reselect have minimum RFoG optical node data feedback channel as current data feedback channel, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration by control unit, otherwise then reselect have minimum RFoG optical node data feedback channel as current data feedback channel, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in an Optical Receivers are all assigned in different data feedback channels by control unit.
Further, after RFoG optical node in all Optical Receivers is all assigned to different data feedback channels, all RFoG optical nodes in any two different data feedback channels in any one Optical Receivers are exchanged, makes the RFoG optical node quantity in these any two different data feedback channels be tending towards balanced.
Advantage of the present invention is: the up link of more than DOCSIS3.0 system of the present invention, achieve, in the up link of more than DOCSIS3.0 system, relaying is carried out to light signal, solve the problem of luminous power deficiency in up link, adopt optical splitter to carry out mixing in repeater to receive simultaneously, a large amount of optical receiver need not be used, cost and Overall Power Consumption are saved, be conducive to promoting, eliminate the method for optical beat interference in the up link of more than DOCSIS3.0 system, avoid optical beat interference, improve and upload link signal to noise ratio.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram of existing RFoG optical node in the up link of DOCSIS2.0 system;
Fig. 2 is the wavelength of transmitted light test data table of the RFoG optical node in the embodiment of the present invention;
Fig. 3 is the tables of data after the RFoG optical node in the embodiment of the present invention is redistributed;
Fig. 4 repeater of the present invention has the structural representation of 4 Optical Receivers;
Fig. 5 is application schematic diagram light signal being carried out to the up link road of the DOCSIS3.0 system of relaying of invention.
Embodiment
In present embodiment, the method of optical beat interference in repeater of the present invention, up link and elimination up link is specifically described in the situation based on DOCSIS3.0 technology, the CMTS Typical Disposition of support DOCSIS3.0 is 16 descending RF passages, there is the downlink bandwidth of 800MBPS, 4 up RF passage US1, US2, US3, US4, have the upstream bandwidth of 160MBPS.
See Fig. 5, the up link of the DOCSIS3.0 system of the present embodiment contains modulation /demodulation terminal system 1, up optical receiver 2, RFoG optical node 3, cable modem 4, repeater 5, control unit 6.
In the present embodiment, RFOG optical node adopts Distributed Feedback Laser, two Distributed Feedback Laser (DistributedFeedbackLaser, i.e. distributed feedback laser) wavelength difference when being less than 0.2nm OBI to the obvious effect of signal to noise ratio, 32 RFoG optical nodes are contained in the present embodiment, Fig. 2 is the wavelength of transmitted light data of 32 RFoG optical nodes, and wavelength of transmitted light data have pressed wavelength sequence; Also analyze the RFoG optical node ID that can produce OBI in the form of Fig. 2 to combine.
See Fig. 4, repeater in embodiments of the present invention, comprise: optical transmitting set 7, RF blender 8 and Optical Receivers 9, the output 10 of Optical Receivers connects the receiving terminal 11 of RF blender, the output 12 of RF blender connects the receiving terminal 13 of optical transmitting set, Optical Receivers 9 comprises optical splitter 14, optical receiver 15, RF attenuator 16, the output 17 of optical splitter connects the receiving terminal 18 of optical receiver, the output 19 of optical receiver connects the receiving terminal 20 of RF attenuator, the output 23 of RF attenuator connects the receiving terminal 11 of RF blender, RF attenuator 16 is connected with control unit 6, control unit 6 can change the attenuation of Optical Receivers 9, repeater in Fig. 4 has 4 Optical Receivers 9, Optical Receivers 9 adopts the structure of 8 mixed 1, meet the input of 332 RFoG, correspondence also can change the Optical Receivers 9 of 4 mixed 1 or 16 mixed 1 into, as long as each Optical Receivers 9 correspondence arranges an optical receiver, a large amount of optical receiver need not be used, cost and Overall Power Consumption are saved, be conducive to promoting.
See Fig. 4, Fig. 5, the up link of DOCSIS3.0 system is the signal transmission link from cable modem 4 to cable modem termination system 1, ethernet signal from user side is converted to radiofrequency signal by cable modem 4, between RFoG optical node 3 and cable modem 4, upstream radio-frequency signal and downlink radio-frequency signal employ frequency multiplexing technique, uplink and downlink signals transmits and does not interfere with each other in same cable, upstream radio-frequency signal is uploaded through data feedback channel, upstream radio-frequency signal is changed into light signal and sends by RFoG optical node 3, light signal from RFoG optical node 3 is gone back to radiofrequency signal by up optical receiver 2 again, upstream radio-frequency signal is converted into ethernet signal and is sent to metropolitan area network by last cable modem termination system 4.The signal conversion of up link is 5 State Transferring: Ethernet-radio frequency-light-radio frequency-Ethernet.
In the up link of the DOCSIS3.0 system of the present embodiment, between up optical receiver 2 and RFoG optical node 3, repeater 5 is set, repeater 5 comprises: optical transmitting set 7, RF blender 8 and Optical Receivers 9, the output 10 of Optical Receivers connects the receiving terminal 11 of RF blender, the output 12 of RF blender connects the receiving terminal 13 of optical transmitting set, Optical Receivers 9 comprises optical splitter 14, optical receiver 15, RF attenuator 16, the output 17 of optical splitter connects the receiving terminal 18 of optical receiver, the output 19 of optical receiver connects the receiving terminal 20 of RF attenuator, the output 23 of RF attenuator connects the receiving terminal 11 of RF blender, the output 21 of optical transmitting set connects up optical receiver 2, the receiving terminal 22 of optical splitter connects RFoG optical node 3, each RFoG optical node 3 is connected with a cable modem 4, control unit 6 is stube cable modulator-demodulator 4 and RF attenuator 16 respectively, the radiofrequency signal of cable modem 4 can control in different data feedback channel by control unit 6, control unit 6 can change the attenuation of Optical Receivers by control RF attenuator 16, control unit 6 can carry out detection signal-to-noise ratio by RF attenuator 16, by the setting of repeater, achieve, in the up link of DOCSIS3.0 system, relaying is carried out to light signal, solve the problem of luminous power deficiency in up link.
See Fig. 4, when up link just powers on, the radiofrequency signal of all cable modems 4 may be distributed in different data feedback channels, starts freely to reach the standard grade.Now due to the impact of OBI phenomenon, the up signal to noise ratio having some cable modems 4 is very poor, and now control unit starts to get involved work.
Cable modem termination system is CableModemTerminalSystems, is below abbreviated as CMTS to represent; Cable modem is CableModem, is below abbreviated as CM to represent; Optical beat interference is OpticalBeatInterference, is below abbreviated as OBI to represent.
In order to solve OBI problem, need the method for the optical beat interference of the up link adopting elimination more than DOCSIS3.0 system of the present invention, obtain the topological structure of Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node, the control unit signal to noise ratio change detected when RFoG optical node uploads light signal determines to produce the optical node combination of optical beat interference; The optical node combination that can produce optical beat interference in each Optical Receivers is assigned in same data feedback channel by control unit.
The method of optical beat interference in the up link of the DOCSIS3.0 system of relaying is carried out in elimination of the present invention to light signal, detect the RFoG optical node producing optical beat interference combine and distribute the optical node combination producing optical beat interference, comprise preparation process concrete:
Preparation process: eliminate OBI: control unit controls all CM and is all limited in data feedback channel US1, but uploading bandwidth can only use 1/4th, but OBI no longer exists, all CM can without packet loss communication, all CM are operated in US1, then will cause the waste of other 3 data feedback channels, inefficiency, preparation process 1 is conveniently subsequent control.
Obtain the topological structure between CM and Optical Receivers: control unit is by controlling the RF attenuator of Optical Receivers one by one, increase or reduce the attenuation of Optical Receivers, the increase decayed causing up link or reduction, the up link of DOCSIS is very responsive to decay, and the launching electrical level of CM will make quick response.Control unit is easy to from the management information of CMTS, obtains these CM by the variable quantity of the launching electrical level gathering CM.Through this step, control unit obtains the corresponding relation of all CM and Optical Receivers, RFoG optical node is not controlled, RFoG optical node finds that CM has radio frequency up, just open laser to launch, therefore actual in control CM is to data feedback channel in control unit 10 control RFoG optical node to data feedback channel, start the data feedback channel of control CM in units of optical node after completing preparation process 1, preparation process 2, each optical node can select US passage (optional US1, US2, US3, US4).
The step that detection produces the RFoG optical node combination of optical beat interference and the optical node combination of distribution generation optical beat interference is as follows:
Step (1): input port RFoG optical node being connected to one by one the optical splitter of each Optical Receivers, control unit controls the attenuator of Optical Receivers one by one, change the attenuation of Optical Receivers, obtain the topological structure of Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node;
Step (2): select an Optical Receivers as current Optical Receivers, select a data feedback channel as the first data feedback channel, the RFoG optical node being connected to current Optical Receivers controls in the first data feedback channel by control unit, and all the other data feedback channels are idle data feedback channel;
Step (3): select an idle data feedback channel as current data feedback channel, select in current Optical Receivers RFoG optical node as current optical node one by one, current optical node controls in current data feedback channel by control unit, control unit control RF attenuator detects RFoG optical node remaining in current optical node and current Optical Receivers and whether there is signal to noise ratio deterioration, if signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs controls in current data feedback channel by control unit, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, select other an idle data feedback channel as current data feedback channel again, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect RFoG optical node remaining in current Optical Receivers and whether current optical node exists signal to noise ratio deterioration by control unit, if signal to noise ratio deterioration do not detected, another idle data feedback channel of direct selection is as current data feedback channel, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in current Optical Receivers are all assigned in different data feedback channels by control unit,
Step (4): repeat step (2), (3) until the RFoG optical node of all Optical Receivers is all assigned in different data feedback channels.
It is that example is described that other steps of the optical node combination that the RFoG optical node combination of detection generation optical beat interference and distribution generation optical beat disturb use Optical Receivers A.
Optical Receivers A accesses RFoG optical node and is numbered 1 ~ 8, and because each RFoG optical node is connected to a CM, so CM numbering is also 1 ~ 8, all CM data feedback channels are US1, these CM are formed an inventory, are convenient to the operation that description CM removes from inventory.
Choose first RFoG optical node in inventory, the data feedback channel of CM corresponding for first RFoG optical node is become an idle passage US2, and control unit detects the up signal to noise ratio situation of change of other CM in inventory.If some CM signal to noise ratio deterioration just indicates the generation of OBI in discovery inventory, the CM that signal to noise ratio deteriorations occur for these is all moved into idle channel US2; If do not find signal to noise ratio deterioration just represent current C M get along well any CM with bunch, remove from inventory after current C M being assigned to idle channel.
After 1st detection signal-to-noise ratio deterioration, totally 3 nodes of the optical node 1,7,8 in Fig. 2 will be assigned to US2, and other 5 nodes are still at 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 at US1, and optical node 2 other optical nodes in inventory of getting along well produce OBI.
After 3rd detection signal-to-noise ratio deterioration, totally 3 nodes of the optical node 3,4,6 in Fig. 2 will be assigned to US4, only have node 5 to stay in US1.
Through 3 detection signal-to-noise ratio deteriorations, all RFoG optical nodes in Optical Receivers A have all been assigned with.
When all RFoG optical nodes in an Optical Receivers are carried out optical beat Interference Detection and distribution produce optical beat interference optical node combination time, if data feedback channel is all assigned with RFoG optical node, also have at least two signal to noise ratio deterioration RFoG optical node does not occur in first data feedback channel, select the data feedback channel having minimum RFoG optical node as in current data feedback channel, signal to noise ratio deterioration RFoG optical node will be there is not one by one and upload in current data feedback channel as current optical node one by one in control unit, control unit control RF attenuator detects the remaining RFoG optical node that signal to noise ratio deterioration does not occur and whether current optical node exists signal to noise ratio deterioration, signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs is controlled in current data feedback channel, reselect have minimum RFoG optical node data feedback channel as current data feedback channel, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration by control unit, otherwise then reselect have minimum RFoG optical node data feedback channel as current data feedback channel, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in an Optical Receivers are all assigned in different data feedback channels by control unit.
In Optical Receivers B, after the 1st detection signal-to-noise ratio deterioration, totally 1 optical node of the optical node 9 in Fig. 2 will be assigned to US2, and other 7 nodes are still at US1, and optical node 9 other optical nodes in inventory of getting along well produce OBI.
After 2nd detection signal-to-noise ratio deterioration, totally 2 optical nodes of the optical node 10,14 in Fig. 2 will be assigned to US3, and other 5 nodes are still at US1.
After 3rd detection signal-to-noise ratio deterioration, the optical node 12,13,15 in Fig. 2 will be assigned to US4, and other 2 nodes are still at US1.
Now passage all takies, select US2 as current data feedback channel, optical node 16 and optical node 9 are placed in a passage, optical node 16 other optical nodes in inventory of getting along well produce OBI, remaining optical node 11 other optical nodes in inventory of also getting along well produce OBI, are retained in US1.
By the method same with RFoG optical node in process Optical Receivers A, RFoG optical node in Optical Receivers B, C, D is assigned in different data feedback channels, in order to realize the equilibrium of data feedback channel, after RFoG optical node in all Optical Receivers is all assigned to different data feedback channels, all RFoG optical nodes in any two different data feedback channels in any one Optical Receivers are exchanged, makes the RFoG optical node quantity in these any two different data feedback channels be tending towards balanced.
In current this area, the present invention is also applicable to DOCSIS3.1 standard, and DOCSIS3.1 standard can make application prospect of the present invention wider, because DOCSIS3.1 supports higher upstream bandwidth.The problem causing the RFoG optical node of single data feedback channel crowded in single data feedback channel RFoG optical node, the single data feedback channel of DOCSIS3.1 has larger bandwidth, this will make congested problem seem so not serious, and following more than the DOCSIS3.1 standard can be applicable equally.
Claims (7)
1. a up link, comprises and being connected:
Cable modem, uploads through data feedback channel after the ethernet signal from user side is converted to radiofrequency signal;
RFoG optical node, uploads after the radiofrequency signal from described cable modem is converted into light signal;
Up optical receiver, uploads after the light signal of described RFoG optical node is converted into radiofrequency signal from the beginning in the future;
Cable modem termination system, in the future from the beginning the radiofrequency signal of described up optical receiver be converted into ethernet signal and be sent to metropolitan area network;
It is characterized in that:
Repeater according to claim 1 is provided with between described up optical receiver and described RFoG optical node, described repeater comprises: optical transmitting set, RF blender and Optical Receivers, the output of described Optical Receivers connects the receiving terminal of described RF blender, the output of described RF blender connects the receiving terminal of described optical transmitting set, Optical Receivers comprises optical splitter, optical receiver, RF attenuator, the output of described optical splitter connects the receiving terminal of described optical receiver, the output of described optical receiver connects the receiving terminal of described RF attenuator, the output of described RF attenuator connects the receiving terminal of described RF blender, the output of described optical transmitting set connects described up optical receiver, the receiving terminal of described optical splitter connects described RFoG optical node, each described RFoG optical node is connected with a described cable modem, up link also comprises control unit, described control unit connects described cable modem and described RF attenuator respectively, the radiofrequency signal of described cable modem can control in different data feedback channel by described control unit, described control unit can change the attenuation of described Optical Receivers by described RF attenuator, described control unit can carry out detection signal-to-noise ratio by described RF attenuator.
2. a kind of up link according to claim 1, is characterized in that: described RFOG optical node adopts Distributed Feedback Laser.
3. one kind is applied to the repeater of up link according to claim 1, comprise: optical transmitting set, RF blender and Optical Receivers, the output of described Optical Receivers connects the receiving terminal of described RF blender, the output of described RF blender connects the receiving terminal of described optical transmitting set, it is characterized in that: Optical Receivers comprises optical splitter, optical receiver, RF attenuator, the output of described optical splitter connects the receiving terminal of described optical receiver, the output of described optical receiver connects the receiving terminal of described RF attenuator, the output of described RF attenuator connects the receiving terminal of described RF blender, described RF attenuator has electricly connected control unit, described control unit can change the attenuation of described Optical Receivers.
4. eliminate the method for the optical beat interference of the up link described in claim 1 for one kind, it is characterized in that: the topological structure obtaining Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node, the control unit signal to noise ratio change detected when RFoG optical node uploads light signal determines to produce the optical node combination of optical beat interference; The optical node combination that can produce optical beat interference in each Optical Receivers is assigned in same data feedback channel by control unit.
5. the method for the optical beat interference of elimination up link according to claim 4, is characterized in that: the step of the optical node combination that the RFoG optical node that detection produces optical beat interference combines and distributes the interference of generation optical beat is as follows:
Step (1): input port RFoG optical node being connected to one by one the optical splitter of each Optical Receivers, control unit controls the attenuator of Optical Receivers one by one, change the attenuation of Optical Receivers, obtain the topological structure of Optical Receivers and cable modem, the data feedback channel of control cables modulator-demodulator in units of RFoG optical node;
Step (2): select an Optical Receivers as current Optical Receivers, select a data feedback channel as the first data feedback channel, the RFoG optical node being connected to current Optical Receivers controls in the first data feedback channel by control unit, and all the other data feedback channels are idle data feedback channel;
Step (3): select an idle data feedback channel as current data feedback channel, select in current Optical Receivers RFoG optical node as current optical node one by one, current optical node controls in current data feedback channel by control unit, control unit control RF attenuator detects RFoG optical node remaining in current optical node and current Optical Receivers and whether there is signal to noise ratio deterioration, if signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs controls in current data feedback channel by control unit, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, select other an idle data feedback channel as current data feedback channel again, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect RFoG optical node remaining in current Optical Receivers and whether current optical node exists signal to noise ratio deterioration by control unit, if signal to noise ratio deterioration do not detected, another idle data feedback channel of direct selection is as current data feedback channel, and select RFoG optical node that in current Optical Receivers, one signal to noise ratio deterioration does not occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in current Optical Receivers are all assigned in different data feedback channels by control unit,
Step (4): repeat step (2), (3) until the RFoG optical node of all Optical Receivers is all assigned in different data feedback channels.
6. the method for the optical beat interference of elimination up link according to claim 5, it is characterized in that: when all RFoG optical nodes in an Optical Receivers are carried out optical beat Interference Detection and distribution produce optical beat interference optical node combination time, if data feedback channel is all assigned with RFoG optical node, also have at least two signal to noise ratio deterioration RFoG optical node does not occur in first data feedback channel, select the data feedback channel having minimum RFoG optical node as in current data feedback channel, signal to noise ratio deterioration RFoG optical node will be there is not one by one and upload in current data feedback channel as current optical node one by one in control unit, control unit control RF attenuator detects the remaining RFoG optical node that signal to noise ratio deterioration does not occur and whether current optical node exists signal to noise ratio deterioration, signal to noise ratio deterioration detected, then the RFoG optical node that signal to noise ratio deterioration occurs is controlled in current data feedback channel, reselect have minimum RFoG optical node data feedback channel as current data feedback channel, detect that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration by control unit, otherwise then reselect have minimum RFoG optical node data feedback channel as current data feedback channel, and select the next one RFoG optical node of signal to noise ratio deterioration not to occur as current optical node, current optical node controls in current data feedback channel and continues to detect remaining RFoG optical node and whether current optical node exists signal to noise ratio deterioration, until all RFoG optical nodes in an Optical Receivers are all assigned in different data feedback channels by control unit.
7. the method for the optical beat interference of elimination up link according to claim 6, it is characterized in that: after the RFoG optical node in all Optical Receivers is all assigned to different data feedback channels, all RFoG optical nodes in any two different data feedback channels in any one Optical Receivers are exchanged, makes the RFoG optical node quantity in these any two different data feedback channels be tending towards balanced.
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| CN108713298A (en) * | 2016-07-28 | 2018-10-26 | 华为技术有限公司 | Communication means, Cable Modem Terminal System and cable modem |
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