CN101646104A - Method, device and system for adjusting power - Google Patents
Method, device and system for adjusting power Download PDFInfo
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- CN101646104A CN101646104A CN200810029972A CN200810029972A CN101646104A CN 101646104 A CN101646104 A CN 101646104A CN 200810029972 A CN200810029972 A CN 200810029972A CN 200810029972 A CN200810029972 A CN 200810029972A CN 101646104 A CN101646104 A CN 101646104A
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Abstract
The embodiment of the invention discloses a method for adjusting power level, which comprises the following steps that: an embedded ONT in an extender EB acquires line status information on an opticalnetwork channel, wherein the line status information is the information on the uplink emission power status, the signal error rate status or the distribution optical network unit identification information status on a line of the optical network channel; and the embedded ONT commands a power adjusting device to adjust the power level on the line of the optical network channel according to the acquired line status information. Correspondingly, the embodiment of the invention also discloses a communication device and an optical network system, an optical line is provided with an extender supporting the function of adjusting the power level, and the extender dynamically adjusts the power level on the line according to the line status on the optical network channel, so a receiver of an OLT isprevented from having ultrahigh emission power and the signal-to-noise ratio of the OLT is improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method, equipment and system that adjusts power.
Background technology
EPON (Passive Optical Network, PON) technology is a kind of light access technology of point-to-multipoint mode, by optical line terminal (Optical Line Termination, OLT), optical branching device, optical network unit (Optical Network Unit, ONU) and the optical fiber that connects this equipment form.OLT is as local side apparatus, be connected with optical branching device (Optical splitter) by a trunk optical fiber, optical branching device connects each ONU by independent branch optical fiber, down direction, optical branching device is realized the beam split function, by branch optical fiber the downlink optical signal of OLT is sent to all ONU; Up direction, optical branching device is realized the light signal aggregation feature, the light signal that all ONU are sent converges, and sends to OLT by trunk optical fiber.
In order to support the long-range data transmission of OLT and ONU, need the light signal in the optical fiber be amplified, derive long distance P ON (Long Reach PON, LR-PON), as shown in Figure 1, on optical transmission pathway, increase a regeneration unit, as power amplifier (Optical Amplifier, OA) or the photoelectricity photoconverter (Optical-Electrical-Optical Converter, OEO), this regeneration unit is regenerated to the light signal among the PON.Here usually optical branching device and regeneration unit can be integrated in same equipment, be called extender (Extender Box, EB).
Regeneration unit in the extender just carries out the regeneration of light signal to passive optical network signal, the data feedback channel passive optical network signal is played a fixing effect of amplifying, different ONU is at optical distribution network (OpticalDistribution Network, ODN) optical loss is also inequality, and EB equipment can't be adjusted the power level of regeneration unit according to the line status of ONU unit and OLT place circuit.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the embodiment of the invention provides a kind of method, equipment and system that adjusts power level.By in the line configuring at optical network path place support the extender that power is adjusted, realized adjustment to power level on the transmission link.
In order to solve the problems of the technologies described above, the embodiment of the invention has proposed a kind of method of adjusting power level, may further comprise the steps:
Embedded ONT among the extender EB obtains the line state information on the optical network path, described line state information is the uplink transmission power state on the circuit of described optical network path place, or the signal error rate state, or distribute the optical network unit marks message state information;
Described embedded ONT adjusts power level on this optical network path place circuit according to the line state information instruction power adjustment equipment that obtains.
Accordingly, the embodiment of the invention has also proposed a kind of communication equipment, comprising:
Embedded ONT, be used to obtain the line state information on the optical network path, described line state information is the uplink transmission power state on the circuit of described optical network path place, or signal error rate state, or distribute the optical network unit marks message state information, and adjust power level on this optical network path place circuit according to the line state information instruction power adjustment equipment that obtains;
Power is adjusted equipment, is used for adjusting power level on this optical network path place circuit according to the instruction of embedded ONT.
Accordingly, the embodiment of the invention has also proposed a kind of optical network system, comprise at least one optical network unit and the optical line terminal that is attached thereto, on the circuit at described optical network unit and described optical line terminal place, disposed and supported power level to adjust the extender of function, this extender is adjusted power level on this optical network path place circuit according to the line state information of optical network unit and optical network path place, described optical line terminal place circuit instruction power adjustment equipment, described line state information is the uplink transmission power state on the circuit of described optical network path place, or the signal error rate state, or distribute the optical network unit marks message status.
Implement the embodiment of the invention, disposed on optical link and supported power level to adjust the extender of function, this extender is dynamically adjusted power level on the circuit according to the line status on the optical network path, thereby improves the signal to noise ratio of OLT.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is existing LR-PON network system architecture figure;
Fig. 2 is LR-PON network system first Organization Chart in the embodiment of the invention;
Fig. 3 is LR-PON network system second Organization Chart in the embodiment of the invention;
Fig. 4 is LR-PON network system second Organization Chart in the embodiment of the invention;
Fig. 5 is the first pass figure that the optical-fiber network in the embodiment of the invention is adjusted the power level method;
Fig. 6 is second flow chart that the optical-fiber network in the embodiment of the invention is adjusted the power level method;
Fig. 7 is the 3rd flow chart that the optical-fiber network in the embodiment of the invention is adjusted the power level method;
Fig. 8 is the communication equipment structural representation in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method, equipment and system that adjusts power level.By in the line configuring at optical network path place support the extender that power is adjusted, realized adjustment to power level on the transmission link.
Fig. 2 shows LR-PON network system first Organization Chart in the embodiment of the invention, a plurality of optical network unit ONU or Optical Network Terminal ONT21 have been comprised, by the optical splitter in the extender 22 (Splitter) 221 a plurality of ONU or ONT are inserted OLT23 in the optical network system, the extender 22 has here been introduced and has been supported power level to adjust the embedded ONT (Embedded ONT) 223 of function, this embedded ONT adjusts the power level of regeneration unit in the optical network system 222 according to line status, regeneration unit 222 is that a power is adjusted equipment, can be according to the power level on the instruction adjustment optical network path place circuit of embedded ONT223.This line status can obtain from OLT, also can directly obtain from network, according to the line status that obtains the power level on the regeneration unit 222 is adjusted.Described line state information is the uplink transmission power state on the circuit of described optical network path place, or the signal error rate state, or distributes the optical network unit marks message status.
Need to prove that in initial procedure, the regeneration unit of optical network path place circuit all disposes an initial power level.The OLT here also adjusts the transmitted power level of single ONU or ONT according to the line status that detects, thereby prevents OLT receiver overload.The regeneration unit 222 here can be OA or OEO.
Fig. 3 shows LR-PON network system second Organization Chart in the embodiment of the invention, and the regeneration unit here is power amplifier (OA).At this moment be provided with OA, optical coupler, Splitter and EmbeddedONT at EB.Optical coupler one end here links to each other with OLT, and the other end has two branches, and a branch meets Embedded ONT, and another branch meets ONU/ONT by OA and Splitter.
Fig. 4 shows LR-PON network system the 3rd Organization Chart in the embodiment of the invention, is provided with OEO transponder, Splitter, optical coupler and Embedded ONT at EB.Optical coupler one end here links to each other with OLT, and the other end has two branches, and a branch meets Embedded ONT, and another branch meets ONU/ONT by OEO transponder and Splitter.
Fig. 5 shows the first pass figure of the optical-fiber network adjustment power level method in the embodiment of the invention, this power level adjustment process is initiated by OLT, detect the line status at optical network path place by OLT after, according to uplink transmission power state or the triggering of signal error rate (BER) state the power level of regeneration unit or ONT is adjusted, concrete steps are as follows:
Step S501: be under (Standby) state of awaiting orders at Embedded ONT, OLT will trigger the multiplication factor of Embedded ONT configuration OA or the transmitted power level of OEO transponder, this trigger process can be passed through Optical Network Termination Management and Control Interface, and (Optical Network TerminationManagement and Control Interface OMCI) realizes;
Step S502:Embedded ONT disposes the multiplication factor of OA or the power level of OEO transponder according to the instruction of OLT;
Need to prove, step S501 is the layoutprocedure of OA or OEO being carried out initial value to the step S502, to the initial configuration process of OA or OEO, be not limited to OLT and trigger Embedded ONT and realize, the initial value of its OA or OEO can be the value that sets in advance or the value of configuration.
Step S503: be under the Standby state transmitted power level of OLT configuration ONU/ONT at ONU/ONT;
Concrete, the transmitted power level of configuration ONT can be finished before step S501 among the step S503, also can finish simultaneously with step S501, also can be after step S501.This process only needs to finish under (Standby) state of awaiting orders to get final product.
Step S504:OLT detects uplink transmission power state or signal error rate (BER) state on the optical network path, can be in all processes, perhaps be in Ranging (range finding)/Operatation (work) and detect during state at Embedded ONT or common ONU;
If it is on the weak side or higher to detect the uplink transmission power of most ONU/ONT, when perhaps the up BER of most ONU/ONT is higher or on the low side, then carry out step S505; If it is on the weak side or higher to detect the uplink transmission power of indivedual ONU/ONT, when perhaps the up BER of indivedual ONU/ONT is higher or on the low side, then carry out step S504b.
Step S505: when OLT detects the on the weak side or BER of the uplink transmission power of most ONU/ONT when higher, perhaps OLT detects the higher or BER of the uplink transmission power of most ONU/ONT when on the low side, OLT just can determine that EB need adjust the transmitted power level of its upgoing O A multiplication factor/OEO transponder, so OLT just sends instruction to Embedded ONT, to trigger the transmitted power level that Embedded ONT adjusts upgoing O A multiplication factor/OEO transponder;
If it is on the weak side or BER is higher to detect the uplink transmission power of most ONU/ONT, then need to trigger the transmitted power level that Embedded ONT improves upgoing O A multiplication factor/OEO transponder, if detect the higher or BER of the uplink transmission power of most ONU/ONT when on the low side, then need to trigger the transmitted power level that Embedded ONT reduces upgoing O A multiplication factor/OEO transponder.
Step S506:Embedded ONT adjusts the power level of multiplication factor/OEO transponder of upgoing O A according to the instruction of OLT, finishes this flow process;
Step S504b: when OLT judges only is that the uplink transmission power of indivedual ONU/ONT is on the weak side or BER is higher, OLT just can determine that indivedual ONU/ONT need adjust its transmitted power level, so OLT just sends Change Power Level message to indivedual ONU/ONT, adjust its transmitted power level to trigger indivedual ONU/ONT, this process can be in all processes, also can be under Ranging (range finding)/Operatation (work) state, finish this flow process at ONU.
Fig. 6 shows second flow chart of the optical-fiber network adjustment power level method in the embodiment of the invention, and this power level adjustment process is initiated by Embedded ONT, and concrete steps are as follows:
Step S601: be under (Standby) state of awaiting orders at Embedded ONT, OLT will trigger the transmitted power level of Embedded ONT configuration OEO transponder, this trigger process can be passed through Optical Network Termination Management and Control Interface, and (Optical Network Termination Management and ControlInterface OMCI) realizes;
Step S602:Embedded ONT disposes the power level of OEO transponder according to the instruction of OLT;
Need to prove, step S601 is to OA/OEO and the layoutprocedure of carrying out initial value to step S602, to the initial configuration process of OA or OEO, be not limited to OLT and trigger Embedded ONT and realize, the initial value of its OA or OEO can be the value that sets in advance or the value of configuration.
Step S603 is to step S604: be in sequence number (Serial Number at Embedded ONT, SN) under the state, Embedded ONT responds serial number request (S/N Request) message of some, but still do not receive distribution ONU sign (Assign ONU-ID) message that OLT sends, at this moment EmbeddedONT will initiate the power level adjustment to upgoing O EO transponder.Here the quantity of S/N Request message is called as serial number request threshold value (S/N_Request_Threshold).When the SN state had just begun, Embedded ONT can instruct the OEO transponder to adopt the power level modes that disposes among the step S602.When surpassing S/N_Request_Threshold, Embedded ONT indication OEO transponder is heightened transmitted power level and is continued response S/N Request message.After adjusting transmitted power level, if surpassed S/N_Request_Threshold again, Embedded ONT just continues indication OEO transponder and improves its transmitted power level, receives Assign_ONU-ID message or stops ONU (Disable ONU) message up to Embedded ONT.
Need to prove, also can when serial number request message is lower than this low threshold threshold value, can triggers OEO and turn down power level here according to a low threshold threshold value is set.
Because the optical loss difference of different ONU in optical distribution network ODN, even same ONU/ONT is also different with the optical loss under the protection trunk optical fiber section in different working trunk optical fiber sections, the OLT receiver should have higher sensitivity and bigger dynamic range under the two-forty condition.For alleviating requirement, all through having all through the ages under the situation than low optical loss, can reduce OA power amplification multiple or the OEO transmitted power level of EB at most ONU/ONT, to prevent OLT receiver overload to the OLT receiver dynamic range; All under the situation through having the high light loss all through the ages, can promote OA power amplification multiple or the OEO transmitted power level of EB at most ONU/ONT.For EB, the power level adjustment refers to that EB can change (improve or reduce) its OA power amplification multiple or OEO transmitted power level, thereby improves the signal to noise ratio of OLT.The power level adjustment has dual mode: Embedded ONT initiates, OLT initiates.When having operating path passage and backup path passage, in as shown in Fig. 3 or Fig. 4, when the operating path passage breaks down, and when switching to the backup path passage and carrying out the transmission of light signal, need the power level information on the circuit of Embedded ONT acquisition operating path passage place, and according to the power level information on the circuit of the adjustment of the power level information on the circuit of operating path passage place backup path passage place.The EmbeddedONT here also supports the adjustment to the OA transmitted power level except that supporting power level adjustment (power levelling) function, and the information interaction between Embedded ONT on operating path and the back-up job.
Fig. 7 shows the 3rd flow chart of the optical-fiber network adjustment power level method in the embodiment of the invention, in this optical network system, there are operating path passage and backup path passage, after operating path breaks down, need switch to the backup path passage, the circuit at the backup path passage place here need be adjusted the power level of place circuit according to the operating path passage, and concrete steps are as follows:
Step S701 is to step S703: when the fibre circuit at operating path passage place break down or the circuit at operating path place on the OLT1 fault, this moment, OLT1 and/or Embedded ONT1 detected the LOS/LOF alarm, trigger and switch, switch to the fibre circuit at standby operating path place by the fibre circuit at operating path passage place, in this process, OLT1 can move the default power level information of each ONU or ONT to OLT2;
Step S704:Embedded ONT1 moves the power level information of its OA/OEO to EmbeddedONT2;
Need to prove, after step S704 occurs in and trigger to switch, with power level information migration in the step 703 be synchronous.
Step S705: when the fibre circuit at backup path place enters operating state when carrying out optical signal transmission, the new power level that Embedded ONT2 calculates OA/OEO according to power level information and the trunk optical fiber length difference of the OA/OEO of former Embedded ONT1;
Step S706:Embedded ONT2 reduces or promotes OA power amplification multiple or the OEO transmitted power level of EB according to result of calculation, if require adjustment ground OA power amplification multiple or OEO transmitted power level to exceed the adjusting range of OA/OEO, then adopt step S707 and step S708, trigger OLT2 by Embedded ONT2 and initiate the power adjustment process;
Step S707 and step S708:OLT2 judge according to the trunk optical fiber length difference whether each ONU adjusts transmitted power level, if difference less than certain limit, then need not be adjusted the transmitted power level of ONU;
If difference greater than certain limit, is then readjusted the transmitted power level of ONU according to the size of difference, can adopt the mode of broadcasting here by OLT2, send out a transmitted power level adjustment instruction to all ONU.
Need to prove, ONU is being adjusted in the process of transmitted power level, the process that process that step S707 realizes to the step S708 and step S705 realize to the step S706 can be synchronous, if carry out power level information migration between the OLT, then do not need to carry out the process of step S707 to the step S708.
Fig. 8 shows the communication equipment structural representation in the embodiment of the invention, this communication equipment can be the EB node, Embedded ONT801 and regeneration unit 802 have been comprised, wherein: Embedded ONT801 is used to obtain the line state information on the optical network path, described line state information is the uplink transmission power state on the circuit of described optical network path place, or signal error rate state, or distribute the optical network unit marks message status, according to the power level on line state information instruction regeneration unit 802 these optical network path place circuits of adjustment that obtain; Regeneration unit 802 is used for the light signal on the optical network path is amplified.This equipment is BE node or other connection device, by the annexation of above-mentioned each unit, can adjust the power level of regeneration unit according to the information of obtaining, and this regeneration unit 802 can be OA or OEO etc.Adjustment scheme in the concrete implementation procedure comprises: when the uplink transmission power on the optical network path place circuit that Embedded ONT 801 obtains is less than normal, or the signal error rate on the optical network path place circuit that obtains is when higher, or the quantity of the distribution optical network unit marks message on the optical network path place circuit that obtains is when surpassing presetting first threshold, and instruction regeneration unit 802 is heightened power level; When the uplink transmission power on the optical network path place circuit that Embedded ONT 801 obtains is bigger than normal, or the signal error rate on the optical network path place circuit that obtains is when on the low side, or the quantity of the distribution optical network unit marks message on the optical network path place circuit that obtains is when surpassing the second default threshold value, and instruction regeneration unit 802 is turned down power level.
Accordingly, when having operating path passage and back-up job path passage in the optical network system, when this equipment Embedded ONT801 is present on operating path passage and the backup path passage, when this operating path passage breaks down, and when switching to the backup path passage and carrying out the transmission of light signal, described EmbeddedONT801 also is used to obtain the power level information on the circuit of operating path passage place, and the power level of adjusting on these optical network path place circuits according to the instruction of the power level information on the operating path passage place circuit that obtains regeneration unit 802; This regeneration unit 802 is adjusted power level on this network channel place backup path circuit according to the instruction of Embedded ONT801.
In sum, the embodiment of the invention has realized transmission link power level adjustment among the PON by introduce the Embedded ONT that supports power level to adjust function in EB according to the line status on the optical link.According to the optical loss difference of different ONU or ONT, adjust the power level on OA or OEO or ONT or the ONU, prevent that OLT receiver transmitting power is excessive, thereby improve the signal to noise ratio of OLT.When optical network system has the backup path passage, when the transmission path of ONU and OLT switches to the backup path passage, can realize the power level adjustment of ONU and/or EB fast, satisfy requirement switching time of LR-PON system.
Above disclosed only is some preferred embodiments in the embodiment of the invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Claims (10)
1, a kind of method of adjusting power is characterized in that, may further comprise the steps:
Embedded ONT among the extender EB obtains the line state information on the optical network path, described line state information is the uplink transmission power state on the circuit of described optical network path place, or the signal error rate state, or distribute the optical network unit marks message state information;
Described embedded ONT adjusts power level on this optical network path place circuit according to the line state information instruction power adjustment equipment that obtains.
2, the method for claim 1 is characterized in that, the power level step that described embedded ONT adjusts on this optical network path place circuit according to the line state information instruction power adjustment equipment that obtains is specially:
When the uplink transmission power on the optical network path place circuit that obtains is less than normal, maybe when the signal error rate on the optical network path place circuit that obtains is higher, maybe when the quantity of the distribution optical network unit marks message on the optical network path place circuit that obtains surpassed presetting first threshold, instruction power adjustment equipment was heightened power level;
When the uplink transmission power on the optical network path place circuit that obtains is bigger than normal, maybe when the signal error rate on the optical network path place circuit that obtains is on the low side, maybe when the quantity of the distribution optical network unit marks message on the optical network path place circuit that obtains surpassed the second default threshold value, instruction power adjustment equipment was turned down power level.
3, method as claimed in claim 1 or 2 is characterized in that, described method also comprises:
When described optical network path comprises operating path passage and backup path passage, when described operating path passage breaks down, and when switching to the backup path passage and carrying out the transmission of light signal, obtain the line state information on the circuit of operating path passage place;
According to the power level information on the circuit of the instruction of the line state information on the circuit of described operating path passage place power adjustment equipment adjustment backup path passage place.
4, method as claimed in claim 3 is characterized in that, described method also comprises:
The power level of judging the adjustment of described power adjustment equipment is to have exceeded the adjusting range that described power is adjusted equipment, if exceed adjusting range, then send indication information to optical line terminal, this indication information is used to indicate optical line terminal to adjust the transmitted power level of optical network unit.
5, a kind of communication equipment is characterized in that, described equipment comprises:
Embedded ONT, be used to obtain the line state information on the optical network path, described line state information is the uplink transmission power state on the circuit of described optical network path place, or signal error rate state, or distribute the optical network unit marks message state information, and adjust power level on this optical network path place circuit according to the line state information instruction power adjustment equipment that obtains;
Power is adjusted equipment, is used for adjusting power level on this optical network path place circuit according to the instruction of embedded ONT.
6, communication equipment as claimed in claim 5, it is characterized in that, when having operating path passage and backup path passage on the optical network path that described communication equipment is positioned at, described operating path passage breaks down, and when switching to the backup path passage and carrying out the transmission of light signal, described embedded ONT also is used to obtain the power level information on the circuit of operating path passage place, and adjusts power level on this optical network path place circuit according to the instruction of the power level information on the operating path passage place circuit that obtains power adjustment equipment;
Described power is adjusted equipment and is adjusted power level on this network channel place backup path circuit according to the instruction of embedded ONT.
As claim 5 or 6 described communication equipments, it is characterized in that 7, described embedded ONT also is used for judging according to the power level information that obtains whether the power level of described power adjustment equipment adjustment has exceeded the adjusting range that described power is adjusted equipment; If exceed adjusting range, then send command information to the optical link terminal point, this indication information is used to indicate optical line terminal to adjust the transmitted power level of optical network unit.
8, communication equipment as claimed in claim 7 is characterized in that, described power adjustment equipment is power amplifier or photoelectricity photoconverter.
9, a kind of optical network system, comprise at least one optical network unit and the optical line terminal that is attached thereto, it is characterized in that, on the circuit at described optical network unit and described optical line terminal place, disposed and supported power level to adjust the extender of function, this extender is adjusted power level on this optical network path place circuit according to the line state information of optical network unit and optical network path place, described optical line terminal place circuit instruction power adjustment equipment, described line state information is the uplink transmission power state on the circuit of described optical network path place, or the signal error rate state, or distribute the optical network unit marks message status.
10, optical network system as claimed in claim 9, it is characterized in that, if when being provided with operating path passage and backup path passage in the described optical network system, when described operating path passage breaks down, and when switching to the backup path passage and carrying out the transmission of light signal, described extender obtains the power level information on the circuit of operating path passage place, and judge whether described power level information adjustment has exceeded the adjusting range that described power is adjusted equipment, if exceed the adjusting range that described power is adjusted equipment, then send indication information to optical line terminal, this indication information is used to indicate optical line terminal to adjust the transmitted power level of optical network unit.
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