CN101615956A - The method and system of a kind of ONU and optical power adjustment - Google Patents
The method and system of a kind of ONU and optical power adjustment Download PDFInfo
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- CN101615956A CN101615956A CN200810068215A CN200810068215A CN101615956A CN 101615956 A CN101615956 A CN 101615956A CN 200810068215 A CN200810068215 A CN 200810068215A CN 200810068215 A CN200810068215 A CN 200810068215A CN 101615956 A CN101615956 A CN 101615956A
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Abstract
The embodiment of the invention discloses a kind of method of optical power adjustment, comprising: ONU monitors descending received optical power/error rate when downlink data receiving; According to the normal variation scope of the descending received optical power/error rate that obtains in advance, judge whether luminous power/error rate that described monitoring obtains exceeds the normal variation scope; When descending luminous power/error rate exceeded the normal variation scope, ONU adjusted up transmitting optical power; The system of a kind of ONU and optical power adjustment is also disclosed; Utilize embodiments of the invention, ONU makes that by autonomous realization optical power adjustment the received optical power excursion of OLT is very little, improves the quality of up direction communication.
Description
Technical field
The present invention relates to field of optical networks, specifically, relate to the method and system of a kind of ONU and optical power adjustment.
Background technology
The PON system is made up of three parts: optical line terminal OLT, light distributed network ODN and Optical Network Terminal ONU/ optical network unit ONT.OLT connects one or more ODN for the PON system provides the network side interface.ODN is the passive optical splitters part, and the data that OLT is descending are transferred to each ONU along separate routes, the upstream data of a plurality of ONU/ONT is gathered to be transferred to OLT simultaneously.ONU provides user side interface for the PON system, uply links to each other with ODN, if ONU directly provides User Port Function, the ethernet user's port as PC online usefulness then is called ONT.No specified otherwise, the ONU that hereinafter mentions system refers to ONU and ONT.
In the PON system, from OLT to ONU, be called descending, otherwise be up.PON system uplink direction adopts TDMA (time division multiple access) mode Data transmission, ONU sends upstream data according to the instruction of OLT, OLT wants that time period of certain ON to send upstream data, this ONU just sends upstream data in the time corresponding section, if OLT does not allow this ONU send data, this ONU turn-offs its laser.
Up direction; because each ONU will control opening of laser and light; not overlapping in order to guarantee two different time slot signals; when OLT carries out the ascending time slot mandate to ONU; it is other because the luminous power of each ONU emission might be different as guard time (Guard Time) to reserve a period of time between two different time slots; perhaps each ONU is to the Line Attenuation difference between OLT; the uplink optical signal that different ONU send has different signal strength signal intensities, promptly different received optical powers when arriving the OLT receiver.When the light signal strength of two adjacent ascending time slots was inconsistent, for up data are carried out correct judgement, the receiver of OLT need reset to decision threshold at the guard time between two time slots.Concrete principle and implementation method please refer to the PON burst luminous signal and receive principle.
For idling slow speed system, the GPON system up as 1Gbps, existing device still is implemented in Guard Time the resetting to decision threshold between adjacent time-slots, but PON system for 10G bps, because it is faster to the time requirement that resets, realize this mode burst receiving function complexity many, cost will be higher.
Existing method be by BER (Bit Error Ratio, bit error rate) as the judgement factor of optical power adjustment, utilizing OLT to pass through PLOAM (Physical Layer OAM, physical layer OAM) message indication ONU increases or reduces transmitting optical power.But the applicant finds in using this procedure: because the BER reflection is a long-term relatively process, might influence normal service communication by BER as the judgement factor of optical power adjustment; And the adjustment luminous power that OLT initiates, the PLOAM message that needs OLT transmission adjustment luminous power is waited for the response of ONU again to ONU, can not once adjust to the right place.
Summary of the invention
In view of the above problems, the embodiment of the invention provides the method and system of a kind of ONU and optical power adjustment.
The method of the optical power adjustment that the embodiment of the invention provides comprises: optical network unit ONU is monitored descending received optical power/error rate when downlink data receiving
According to the normal variation scope of the descending received optical power/error rate that obtains in advance, judge whether luminous power/error rate that described monitoring obtains exceeds the normal variation scope;
When the descending luminous power/error rate that obtains when described monitoring exceeded the normal variation scope, ONU adjusted up transmitting optical power.
The optical network unit that the embodiment of the invention provides comprises the transmitting optical power adjustment control module that is connected with optical transceiver; Described transmitting optical power is adjusted control module and is comprised that received optical power/error rate measurement module, luminous power/error rate change judge module, transmitting optical power/error rate adjusting module;
Described received optical power/error rate measurement module is monitored descending received optical power/error rate when the optical transceiver downlink data receiving;
Described luminous power/the error rate changes descending received optical power/error rate that judge module is used for judging that described received optical power/error rate measurement module monitors obtains whether within predefined descending received optical power/error rate normal variation scope;
Described transmitting optical power/error rate adjusting module is used for when the described luminous power/error rate changes judge module and judges descending luminous power/error rate that described monitoring obtains and exceed the normal variation scope, the up transmitting optical power when adjusting optical transceiver and sending data.
The system of the optical power adjustment that the embodiment of the invention provides comprises OLT and ONU, and wherein ONU comprises optical transceiver and transmitting optical power adjustment control module;
OLT sends downlink data to ONU, when the optical transceiver among the ONU receives described data, transmitting optical power is adjusted control module and is monitored descending received optical power/error rate, and judge that the descending received optical power record is whether within the descending reception error rate/error rate normal variation scope of acquisition in advance, when exceeding the normal variation scope, adjust the up transmitting optical power of optical transceiver when OLT sends data.
Utilize the embodiment of the invention, the realization optical power adjustment that ONU can be autonomous fast makes that the received optical power excursion of OLT is very little, improves the quality of up direction communication.
Description of drawings
Fig. 1 is the method flow diagram of the embodiment of the invention one;
Fig. 2 is the method flow diagram of the embodiment of the invention two;
Fig. 3 is the ONU structural representation of the embodiment of the invention one;
Fig. 4 is the ONU structural representation of the embodiment of the invention two;
Fig. 5 is the system configuration schematic diagram of the embodiment of the invention.
Embodiment
Because ODN generally satisfies two-way conforming requirement, during normal the operation, suffered influence had certain relation when the light signal of down direction transmitted on ODN, the Line Attenuation basically identical on downgoing line decay and the up direction for example, promptly, down direction decay represents that also the decay on the up direction also changes, so can represent attenuation on the up direction with the down direction attenuation when changing.And because the receiving optical signals of down direction is continuous, so can utilize ONU to monitor the situation that descending received optical power is judged down link, and then can judge uplink scenario, thus ONU adjusts the luminous power of up transmission light signal.
In embodiments of the invention one, ONU is according to the descending received optical power value and the predefined descending received optical power normal variation scope that record, whether the variable quantity of judging described descending received optical power value exceeds predetermined normal variation scope, when descending optical power change amount surpassed the normal variation scope, ONU adjusted up transmitting optical power.
Preestablish described descending received optical power normal variation scope and can be and descending received optical power reference value is set simultaneously and normal variation amount realizes, wherein the luminous power reference value can be the mean value of the actual downstream received optical power value of a period of time of recording of ONU, the perhaps optical power value of setting according to mean value in history.Described setting can also realize to ONU transmission setting or regulating command by OLT or other network management devices.
Below in conjunction with Fig. 1 ONU being changed the step of adjusting up transmitting optical power according to descending received optical power is specifically described:
100, a descending received optical power normal variation scope is set on ONU;
Specifically can be provided with descending received optical power reference value (such as be respectively-26dBm), and normal variation amount (such as being respectively 0.5dBm), then descending received optical power normal variation scope be-26.5dBm～-25.5dBm; Wherein this reference value can be ONU according to (data communication does not have error code) under the normal operation, the mean value of the descending received optical power that the long period records automatically is provided with or is adjusted by ONU; This reference value on the ONU also can be disposed or adjust by OAM (Operations, Administration and Maintenance, Operations, Administration and Maintenance) message by OLT; Need to prove that if normal variation amount is made as 0, then described descending received optical power normal variation scope is exactly specific a certain value, and this value equals descending received optical power reference value-26dBm, this special case does not influence following step;
102, ONU monitors descending received optical power;
104, ONU judges whether the actual descending received optical power that records exceeds described descending received optical power normal variation scope; If not, then forward step 102 to, continue monitoring; Otherwise forward step 106 to;
106, ONU adjusts up transmitting optical power, forwards step 102 afterwards to, continues monitoring.
If the actual descending received optical power that records within described descending received optical power normal variation scope, is not adjusted the up transmitting optical power of ONU; Otherwise, up transmitting optical power oppositely to be adjusted, the descending received optical power that promptly records is then transferred big up transmitting optical power less than the lower limit of reference range; Greater than the upper limit of reference range, then turn up transmitting optical power down.The size of up transmitting optical power adjustment can surpass being in proportion of normal variation scope with the descending received optical power that records, perhaps by predefined step value adjustment.In order to guarantee reliability, when adjusting up transmitting optical power, can make each adjustment amount of up transmitting optical power be no more than descending received optical power normal variation amount.
For example, when the actual descending received optical power that records is-26.9dBm, the little 0.4dBm of lower limit-26.5dBm than descending received optical power normal variation scope, then ONU transfers big up transmitting optical power, the value of adjusting is a described difference or proportional with it, promptly transfer big up transmitting optical power 0.4dBm or 0.4dBm*x, x is a coefficient, and greater than 0.Owing to described difference is carried out not having materially affect as up transmitting optical power adjustment parameter to adjusting the result after the mathematic(al) manipulation, so also can adopt similar more complicated transmitting optical power control method to adjust up transmitting optical power.
Wherein the adjustment mode of up transmitting optical power can realize by bias current and/or the drive current of regulating the generating laser that sends upward signal for, ONU.
According to this embodiment following improvement project one is arranged: the reference range that a descending received optical power is set on ONU.In above-mentioned enforcement will according to the reference value of descending received optical power (such as for-26dBm) and descending received optical power normal variation amount (such as being 0.5dBm) judge whether the actual descending received optical power that records exceeds the normal variation scope, this improvement project then be directly be provided with two up and down threshold value (such as be respectively-25.5dBm and-26.5dBm), in this improvement project according to the descending received optical power that records whether the reference range of descending received optical power (such as-26.5dBm～-judge whether this variable power exceeds the normal variation scope within 25.5dBm).If overrun then up transmitting optical power is reversed adjustment, set-up procedure is similar to the above embodiments, does not repeat them here.
In the embodiments of the invention two, the variation of descending received optical power is known in the variation that utilizes ONU to detect the descending reception error rate.Because the major influence factors that descending received optical power size is the descending reception error rate in the PON system, the variation that is the descending reception error rate of ONU can reflect directly that the descending received optical power of ONU changes, and the variation of the descending transmitting optical power of OLT usually is very little, therefore can detect descending reception error rate situation of change by ONU reflects descending received optical power situation of change, and for example the descending received optical power of the too big expression of the descending reception error rate of ONU ONU is too little.So present embodiment is provided with the reference value M and the normal variation value k thereof of a descending reception error rate on ONU, a descending reception error rate normal variation scope perhaps is set (such as being M-k～M+k) on ONU, then whether ONU judges in M-k～M+k scope that according to the descending reception ber value of actual count whether the down direction line power exceeds the normal variation scope, adjusts the up direction transmitting optical power then.If for example the actual measured descending reception ber value of ONU has surpassed upper limit M+k, show that the descending reception error rate has surpassed the normal variation scope, simultaneously show that also descending received optical power is lower than the normal variation scope, so need to improve the up transmitting optical power of this ONU; Vice versa.Concrete steps and the above embodiments one and improvement project one thereof are similar, and the size of up transmitting optical power adjustment can surpass being in proportion of normal variation scope with the descending reception error rate, perhaps adjusts according to predefined step value.As shown in Figure 2:
200, a descending reception error rate normal variation scope is set on the ONU;
A descending reception error rate reference value specifically can be set (such as being 10 on ONU
-12), and normal variation amount is (such as being respectively 10
-13), then descending reception error rate normal variation scope is 0.9 * 10
-12～1.1 * 10
-12The reference range (0.9 * 10 of a descending reception error rate perhaps directly is set on ONU
-12, 1.1 * 10
-12);
202, ONU adds up the descending reception error rate;
204, judge that the descending reception error rate of statistics is whether within the descending reception error rate normal variation scope of described setting; If not, then forward step 202 to, continue monitoring; Otherwise forward step 206 to;
206, according to the actual descending reception error rate that the records judged result within described descending reception error rate normal variation scope whether, adjust up transmitting optical power; Forward step 202 afterwards to, continue monitoring.
If being specially the descending reception error rate of actual count is 10
-11, exceed descending reception error rate normal variation scope on be limited to 8.9 * 10
-12, then transfer big up transmitting optical power, wherein adjusting range can with the described value 8.9 * 10 that exceeds
-12Proportional or adjust according to certain step value.
ONU among the embodiment one comprises transmitting optical power adjustment control module and optical transceiver as shown in Figure 3.Described transmitting optical power is adjusted control module and is monitored descending received optical power/error rate, and judge whether the actual descending received optical power that records does respective handling after within the predefined descending reception error rate/error rate normal variation scope, it further comprises received optical power measurement module, optical power change judge module, transmitting optical power adjusting module.Described received optical power measurement module is measured descending received optical power when the optical transceiver downlink data receiving; Described optical power change judge module judges that the actual descending received optical power that records is whether within predefined descending received optical power normal variation scope; Described transmitting optical power adjusting module is according to the judged result of described optical power change judge module, up transmitting optical power when adjusting optical transceiver transmission data, make up transmitting optical power not exceed described descending received optical power value normal variation scope, adjust up transmitting optical power and be specially the amount that the up transmitting optical power of ONU need be adjusted of calculating, realize by the drive current of regulating generating laser in the optical transceiver.
ONU among the embodiment two comprises transmitting optical power adjustment control module and optical transceiver as shown in Figure 4.Described transmitting optical power is adjusted control module and is comprised that reception error rate measurement module, the error rate change judge module, transmitting optical power adjusting module and optical transceiver.Described reception error rate measurement module is added up the error rate of descending reception data when the optical transceiver downlink data receiving; The described error rate changes judge module and judges that the descending received optical power of actual count is whether within predefined descending reception error rate normal variation scope; Up transmitting optical power when described transmitting optical power adjusting module is adjusted optical transceiver transmission data according to the judged result of described error rate variation judge module, adjust up transmitting optical power and be specially the amount that the up transmitting optical power of ONU need be adjusted of calculating, realize by the drive current of regulating generating laser in the optical transceiver.
The system configuration of the invention process embodiment comprises OLT and ONU as shown in Figure 5, and wherein ONU comprises optical transceiver and transmitting optical power adjustment control module.OLT sends downlink data to ONU, when the optical transceiver among the ONU receives described data, transmitting optical power is adjusted control module and is monitored descending received optical power/error rate, and judge that the actual descending received optical power that records is whether within the predefined descending reception error rate/error rate normal variation scope, when exceeding the normal variation scope, the up transmitting optical power that shows ONU needs to adjust, the up transmitting optical power when adjusting ONU and send data to OLT according to the plussage of described optical power value/error rate and/or predefined step value.
Like this, if Line Attenuation increases (the descending transmitting optical power when OLT issues data does not change), then the descending received optical power of ONU diminishes, after using the scheme of putting down in writing in the foregoing description, ONU can adjust up transmitting optical power automatically according to the variation of descending received optical power, make the received optical power excursion of OLT reduce, improve the quality of up direction communication, and reduce the dynamic range of OLT receiver; As all ONU during all according to the up transmitting optical power value of the corresponding adjustment of the variable quantity of descending received optical power, can guarantee easily that OLT receives from the smaller dynamic range of the up luminous power of all ONU, can reduce the performance requirement that the burst of the receiver of OLT receives thus, then do not need decision threshold is resetted, can save the circuit that resets, not only can reduce the complexity and the cost of OLT receiver, the cost of the design of simplified system and reduction PON system.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of method of optical power adjustment is characterized in that, comprising:
Optical network unit ONU is monitored descending received optical power/error rate when downlink data receiving;
According to the normal variation scope of the descending received optical power/error rate that obtains in advance, judge whether luminous power/error rate that described monitoring obtains exceeds the normal variation scope;
When the descending luminous power/error rate that obtains when described monitoring exceeded the normal variation scope, ONU adjusted up transmitting optical power.
2, method according to claim 1, it is characterized in that, the normal variation scope of the described descending received optical power/error rate that obtains in advance comprises the normal variation scope that the upper and lower limit according to the up received optical power/error rate normal variation that obtains draws, perhaps the normal variation scope that draws according to the descending received optical power reference value of up received optical power/error rate that obtains and normal variation amount thereof.
3, method according to claim 2 is characterized in that, the up transmitting optical power of described adjustment comprises: if luminous power/error rate that described monitoring obtains greater than the upper limit of described normal variation scope, is then turned up transmitting optical power down; If luminous power/error rate that described monitoring obtains, is then transferred big up transmitting optical power less than the lower limit of described normal variation scope.
4, method according to claim 2 is characterized in that, the acquisition mode of the normal variation scope of described descending received optical power/error rate comprises the setting that sends from optical line terminal OLT or network management device or the regulating command and obtaining.
5, method according to claim 2 is characterized in that, described ONU adjusts up transmitting optical power and comprises that the plussage and/or the predefined step value that exceed described normal variation scope according to described optical power value/error rate adjust.
6, a kind of optical network unit is characterized in that, comprises the transmitting optical power adjustment control module that is connected with optical transceiver; Described transmitting optical power is adjusted control module and is comprised that received optical power/error rate measurement module, luminous power/error rate change judge module, transmitting optical power/error rate adjusting module;
Described received optical power/error rate measurement module is monitored descending received optical power/error rate when described optical transceiver downlink data receiving;
Described luminous power/the error rate changes descending received optical power/error rate that judge module is used for judging that described received optical power/error rate measurement module monitors obtains whether within predefined descending received optical power/error rate normal variation scope;
Described transmitting optical power/error rate adjusting module is used for when the described luminous power/error rate changes judge module and judges descending luminous power/error rate that described monitoring obtains and exceed described normal variation scope, the up transmitting optical power when adjusting optical transceiver and sending data.
7, optical network unit according to claim 6 is characterized in that, adjusts described up transmitting optical power and comprises: if luminous power/error rate that described monitoring obtains greater than the upper limit of described normal variation scope, is then turned up transmitting optical power down; If luminous power/error rate that described monitoring obtains, is then transferred big up transmitting optical power less than the lower limit of described normal variation scope.
8, optical network unit according to claim 7 is characterized in that, adjusts described up transmitting optical power and realizes by the drive current of regulating in the optical transceiver.
9, a kind of system of optical power adjustment is characterized in that, comprises optical line terminal OLT and optical network unit ONU, and wherein said ONU comprises optical transceiver and transmitting optical power adjustment control module;
Described OLT sends downlink data to described ONU;
When the optical transceiver in described ONU receives described data, described transmitting optical power is adjusted control module and is monitored descending received optical power/error rate, and judge that the descending received optical power/error rate record is whether within the descending reception error rate/error rate normal variation scope of acquisition in advance, when exceeding described normal variation scope, adjust the up transmitting optical power of described optical transceiver when described OLT sends data.
10, system according to claim 9 is characterized in that, adjusts described up transmitting optical power and comprises that the plussage and/or the predefined step value that exceed the normal variation scope according to described optical power value/error rate adjust.
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