CN1665175A - Method for implementing power detection based automatic power control in optical network - Google Patents
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Abstract
The invention relates to a method for implementing automatic power control based on power detection in an optical network. It monitors and regulates the power of all the corresponding nodes in a power control link according to the standard power value provided by the given reference standard, so as to meet the transmitting needs of the optical network and can implement full auto power control on the condition without any artificial interference. Therefore, it can make the power control link in the optical network possess a better self-adapting ability and maintain stable transmitting property in the allowable power change range of the system. It can clearly grasp the power condition of each node in the whole power control link and is convenient for system maintenance and trouble clearing.
Description
Technical field
The present invention relates to technical field of optical network communication, relate in particular to the implementation method of controlling based on the automated power of power detection in a kind of optical-fiber network.
Background technology
In the optical transmission system,, need to increase OA (Optical Amplifier, image intensifer) usually in order to compensate the loss that transmission line brings.In WDM (Wavelength DivisionMultiplexing, wavelength-division multiplex system), because image intensifer can amplify simultaneously to a plurality of wavelength channels, this characteristic is particularly important.The most widely used image intensifer of wavelength-division multiplex system is EDFA (Erbium Doped Fiber Amplifier, an erbium-doped fiber amplifier).
In the actual light transmission system, because optical fiber is aging, the connector loose contact, the drift of VOA (VariableOptical Attenuator, adjustable optical attenuator) attenuation, ageing equipment or network configuration change or the like reason, to cause a certain section Line Attenuation ANOMALOUS VARIATIONS to occur, if do not add control for this situation image intensifer, the energy that will cause originally being used for amplifying each wavelength can be transferred on the wavelength of residual signal, thereby has a strong impact on the system transmissions performance.For avoiding this bad gain competition effect, image intensifer adopts the gain locking mode usually, promptly by power detection and control measure, makes that the difference of the output input power that image intensifer produces is constant.The image intensifer of described gain locking control measure can only guarantee the relatively stable of transmission signals, promptly keep the constant of input and output power difference, rather than the absolute value of power, so the attenuation change of this a certain section circuit will be transmitted by follow-up each image intensifer, thereby downstream links is produced very adverse influence, as shown in Figure 1a, when the generation decay is unusual in the network, light amplifier gain is constant in G remains unchanged, but the unusual input and output power absolute value of node afterwards of decay all will be affected.
For avoiding above-mentioned adverse influence, can adjust improvement accordingly by the power control measure, referring to Fig. 1 b, when the generation decay is unusual in the network, then first node after decay is unusual carries out the power adjustment, make the power absolute value of this node recover normal, this moment, the entire gain of this node was changed to G ', and each node after this node no longer is subjected to the unusual influence that decays.Certainly, if the decay ANOMALOUS VARIATIONS exceeds certain limit,, therefore need take other measures can recover normal because light network transmission system at this time in fact has been in down state.
At present, the most common in light network transmission system also is that the simplest monitoring means are power detection.For whole wavelength-division multiplex system, no matter be the change of transmission wavelength number, or the ANOMALOUS VARIATIONS of decay, the performance on gross power all is identical.We need further process on the power detection basis, correctly judge the unusual rough sledding of decay, can avoid transmitting the interference that wave number changes simultaneously again.A kind of concrete grammar that is for further processing on the power detection basis is to detect the luminous power at one section optical fiber link two ends by webmaster, thereby calculates link actual attenuation value.Compare calculating the actual attenuation value and the preset link standard losses value that obtain, obtain link actual attenuation situation of change.Then, by the power adjustment of relevant device before and after the link, this part of links attenuation change is compensated again, make it meet normal power level.
Although said method has guaranteed the decay in the network and can not transmit backward, thereby downstream links has been had a negative impact the complicated operation that exists, maintenance cost height, the problem of real-time and poor reliability in actual application.
Transmit for avoiding Line Attenuation to change backward, another method that adopts is based on the link power control method of wave number testing mechanism at present, be specially: the wave number information of in power detection, obtaining transmission signals, because in the ripe light network transmission system, the link single wave power level during operate as normal everywhere can be determined according to system specification index, therefore can be the absolute value benchmark of power with the transmission signals wave number information translation of obtaining easily, and then itself and system's actual power measured value compared, and carry out the adjustment of power according to comparative result, make it meet normal power level.
Equally, link power control method based on the wave number testing mechanism has also shown some shortcomings in the application process of reality, the shortcoming that this method exists mainly is wave number checkout gear deployment cost and reliability aspect, and under the power absolute value benchmark that this wave number converts, multilink collaborative work complexity, must realize by manual intervention, can't realize full automatic adjusting.
Summary of the invention
Problem in view of above-mentioned prior art existence, the purpose of this invention is to provide the implementation method of controlling based on the automated power of power detection in a kind of optical-fiber network, thereby automatically the power to whole link carries out overall monitor and adjustment, guarantees the transmission performance of optical-fiber network, and realizes that cost is lower.
The object of the present invention is achieved like this:
The implementation method of controlling based on the automated power of power detection in the described optical-fiber network comprises:
A, be each node configuration reference data on the power control link in the optical-fiber network, described reference data provides the fiducial value of power detection, and the fiducial value of the power detection that provides of described reference data can be upgraded with link condition;
B, the described power of detection are controlled the power of the appointment detection position of each node on the link, and according to reference data and prerequisite described power are adjusted accordingly.
Described steps A comprises:
A1, node in the optical-fiber network is configured to a logic power control link according to the direction of business;
A2, be each node configuration reference data on the described logic power control link.
Described steps A 2 comprises:
Be each node difference or unified configuration reference data on the described logic power control link, and the performance number that described reference data provides can derive from beyond this intra-node or this node, if from this node outside, then also need to carry out information interaction by optical transmission system monitoring and controlling channels or other feasible data channel;
Described reference data can be a definite calibration power value, also can be a definite power detection position; If reference data is a definite power detection position, then should obtain corresponding performance number in the inquiry of described detection position when needed, and the calibration power value that obtains offered node, if the power detection position of node has different power requirements with the power detection position that reference data is determined, then need the power information that power detection obtains to be adjusted accordingly, thereby obtain the corresponding standard performance number according to the side-play amount that provides.
Described steps A 2 comprises:
The calibration power value of described reference data correspondence is the power information by directly the power measurement acquisition is carried out in the relevant position in optical-fiber network, or the power information that obtains of the wavelength number information translation of obtaining by spectrum analysis, or determine by artificial according to network transmission performance.
Among the present invention, if the calibration power value of reference data correspondence is from this node outside, must carry out noise compensation to it, be specially: preset the power back-off parameter according to optical transmission system specifications parameter and performance index during node configuration, this node carries out the noise compensation processing according to the power back-off parameter of configuration after obtaining reference data original power value, obtains the calibration power value of the required reality of this node.
Among the present invention, described reference data need be controlled the changing condition timing or the real-time update of link according to power.
Described step B comprises:
B1, detect the power that each node on the described power control link is specified the detection position in real time;
B2, judge whether the difference between the calibration power value that described power and node reference data provided exceeds the threshold value of setting, if exceed, execution in step B3 then, otherwise, execution in step B1;
B3, power is adjusted according to described difference, after adjustment process finishes, execution in step B1.
Described step B2 also comprises:
If the difference between the calibration power value that reference data provided that disposes on the power of node appointment detection position and the corresponding node exceeds the threshold value of setting, whether the appearance of then further judging described difference is owing to the accidental fluctuation of current system causes, if, execution in step B1 then, otherwise, execution in step B3.
Described step B3 comprises:
Automatic or manual starts one or more power and adjusts processing procedure, with every logic power control link is the unit independent regulation, and carry out the power adjustment at each node that comprises on by traffic direction on every logic power control link successively to link, after adjustment process finishes, execution in step B1.
In the invention described above, step B3 is described to carry out the power adjustment and comprises:
By the attenuation rate of adjustment adjustable optical attenuator, or adjust corresponding laser pumping power and carry out the power adjustment.
Described step B3 comprises:
Described difference is the amplitude that power need be adjusted, if system exists single and adjusts the maximum thresholding that allows to regulate, be that standard is adjusted then not exceed the maximum permission of single adjustment adjustment doors limit value, otherwise directly the amplitude of adjusting is on demand adjusted, and continues execution in step B1 after adjusting is finished.
As seen from the above technical solution provided by the invention, the present invention gives directions the power of detection position to monitor adjustment according to the calibration power value of setting that reference data provided to each node in the corresponding power control link, to satisfy the needs of optical-fiber network transmission.Therefore, realization of the present invention makes the power control link in the optical-fiber network have better self-adapting ability, and it is stable to keep transmission performance in system power changes marginal range.
Among the present invention, can grasp the power situation of each node on the whole piece power control link clearly, getting rid of for system maintenance and fault provides convenience.And, power control link of the present invention is flexible configuration as required, the simplest also is that the most common configuration mode is that a power control link only comprises a reference data, can certainly comprise a plurality of reference datas by whole piece power control link, even thereby it is frequent to guarantee that the primary link wave number changes, also still can include same power control link in and manage, for example when the primary link wave number changes, only need new reference data be set and get final product at this variation.Simultaneously, the separate node power adjustment of carrying out separately of many power control links that the present invention disposed, adjustment process is not disturbed mutually, and need not to realize full automatic power control under the condition of manual intervention.In addition, the power adjustment operation of each power control link of the present invention is finished by each node on the corresponding link is collaborative, makes that the autonomous degree of node device is higher, and antijamming capability is stronger.
Description of drawings
The unusual schematic diagram of decay appears in Fig. 1 a in the optical signal transmission process;
Fig. 1 b is a power control operation schematic diagram of the prior art;
Fig. 2 is the power control operation schematic diagram of power Quality Initiative circuit node among the present invention;
Fig. 3 is the flow chart of method of the present invention.
Embodiment
Method of the present invention is by the detection means based on power detection mechanism, realizes the full-automatic cheaply power control at full link, and can effectively compensate the influence that the image intensifer integrated noise is brought in the link.
The implementation method of controlling based on the automated power of power detection in the optical-fiber network of the present invention mainly comprises following processing procedure:
(1) carries out the configuration that power is controlled link at full link, be about to whole link and be configured to one or more of separate power control links respectively according to the needs such as professional status transmission of reality, every power control link comprises the node of one or more optical-fiber network;
(2) carry out the configuration of reference data at power control each node that link comprised, the fiducial value of power detection that reference data provides (being the calibration power value), be the basis of each node power abnormality detection, and the calibration power value that described reference data provides can be upgraded with link condition;
The reference data that node disposed can be a definite performance number, it also can be a definite power detection position, if the power detection position of reference data for determining, then need regularly to detect or carry out query manipulation in the relevant detection position when confirming unusually, to obtain corresponding performance number, and a performance number that obtains offered node, node carries out this node power demand fiducial value of just obtaining behind the noise compensation, i.e. calibration power value.
(3) node that carries out the power adjustment for needs carries out corresponding power adjustment operation, thereby make node power that normal power level (the calibration power value that is provided with reference data is roughly suitable) is provided, judge in above-mentioned (2) that promptly the power of determining a certain node departs from the normal power level significantly, then carry out corresponding power adjustment, for example, can carry out the adjustment of power by adjusting adjustable optical attenuator, or carry out the adjustment of power by adjusting corresponding laser pumping power.
The specific implementation of method of the present invention such as Fig. 2, shown in Figure 3 specifically comprise:
Step 31: by traffic direction number consecutively A1, A2...An, for example, Ai shown in Figure 2, Aj just represent different nodes respectively with each interdependent node on the wavelength-division multiplex system, and are configured to a power control link A in logic.Each node is by the system monitoring channel, and perhaps other feasible data channel such as FEC (Forward Error Correction, forward direction error code correction) protocol byte etc. is realized the information interaction and the collaborative work of each node of logic power control link;
In the described power control link, link is identical entirely for transport service, also can change, this variation usually occurs in OADM site, variation according to transport service can further be subdivided into a plurality of power control sections with described power control link, separate between each power control section, collaborative mutually, by power adjustment operation, finish the automated power control of whole power control link jointly to each self-contained node; At this moment, concern all fours between the relation between these a plurality of power control sections and a plurality of individual power control link, under specific configuration needs, these power control sections also can become independently power control link.
Described power control link also supports to comprise other network construction forms of annular networking except being applicable to the most typical chain networking of wavelength-division multiplex system.
Step 32: be each node configuration reference data on the power control link, usually adopt described reference data is configured to a power detection position, adjust in the processing procedure in follow-up power detection and power, judge based on the calibration power value that described reference data provided whether this node power occurs unusually;
The reference data of each node on the described power control link can be provided with according to actual needs, the configuration of the power detection position of reference data correspondence is relatively free, can be configured in this node, also can be configured in other nodes, carry out the mutual of power information by approach such as monitoring and controlling channels if be configured in other nodes then need; Each node can dispose same reference data, also can dispose a reference data separately by each node; As in Fig. 2, Ai, Aj node all with the B position of certain node on the A link as the reference benchmark.
The correct pairing reference data of configuration node is the prerequisite that whole power control and treatment process realizes.The calibration power value of reference data correspondence can be that the performance number of acquisition is directly measured in the power detection position of reference data correspondence, also can be that wave number detects the wavelength number information translation of being obtained and the performance number of coming, described calibration power value can also be by the artificial performance number of appointment as required, or by other detection meanss obtain the calibration power value;
Because the power situation of power control link is in the state of continuous variation, so the calibration power value that reference data provided must be upgraded at any time can be effective, for this reason, can adopt the mode of regularly upgrading, also can detect the renewal operation that power carries out reference data after unusual; The node that has reconfigured new reference data can be configured as the beginning of a new power control link, also can be used as a new power control section, include original power control link in and carry out power control administration, for example, transmission link K exists K1, K2, three nodes of K3, the transport service of K1 to K2 and K2 to K3 has nothing in common with each other, can be configured to two separate power control links to these two traffic segment, also can be configured as same power control link, this link has comprised K1 to K2 and these two power control sections of K2 to K3.
Step 33: each node that detects in real time or regularly on the power control link that disposes in the optical-fiber network is specified the power of detection position, and obtains the corresponding reference benchmark.It is to realize at this node that real-time or node power regularly detects; Detection Di, Dj among Fig. 2 is exactly the appointment detection position of node Ai, Aj.
Concrete setting principle for the described reference power of step 32 is relevant with the power detection position of each node, usually must have confirmable power corresponding relation between the node power of reference power and reality, it is identical that the simplest situation is exactly both business tines of transmission; In order effectively to locate the link ANOMALOUS VARIATIONS, realization of the present invention requires the variable power of reference data to embody strictly according to the facts in the node power detection position, the node power that promptly gets access in the power detection position changes, all only comprised the ANOMALOUS VARIATIONS of self-reference benchmark, do not changed the interlock influence that is brought and can not be subjected to external power to realtime power detection position this section power control link inside.
Simplify principle for link configuration, avoid each node arbitrarily to be provided with and cause the corresponding relation confusion, advising that full link adopts same reference data under the situation as much as possible, as the unified first node of link that is set to; For OADM site,, must reassign new reference data usually because transport service changes.
Step 34: judge whether the difference between the reference power of the power of each node that described detection obtains and respective nodes exceeds the threshold value of setting, if exceed, then execution in step 35, otherwise execution in step 33;
The threshold value of described setting is determined according to the transmission requirement of optical-fiber network;
In addition, it should be noted that, because whole abnormality detection is based on the realtime power testing mechanism and realizes, so need take certain measure, the erroneous judgement that brings unusually that the filtering appts accidental fluctuation causes is disconnected, for example, confirm operation after detecting unusually, the unusual back execution in step 35 of final affirmation, if definite described unusual for system's accidental fluctuation causes, then execution in step 33.
Step 35: the node power to the threshold value that exceeds setting is adjusted, and is normal power level until the power of this node, and promptly the difference between node power and corresponding reference power does not exceed the threshold value of setting, and execution in step 33;
After emergent power is unusual, can be automatically or start-up by hand regulate, with wall scroll power control link, perhaps the single power control section on the power control link is a unit, each node is carried out the power adjustment successively and is operated; Because power detection is based on the relative residual quantity of power, but parallel processing between many power control links or a plurality of power control section, and need not to consider collaborative order;
Concrete adjusting measure can be to realize that by the attenuation rate of adjusting adjustable optical attenuator or corresponding laser pumping power adjusting Ci, Cj as shown in Figure 2 is power and adjusts the position.If the use adjustable optical attenuator though select for use electric adjustable optical attenuator cost than hand adjustment optical attenuator height, can be realized full-automatic regulation, reduce the manual maintenance cost greatly;
Simultaneously, for avoiding the system power fluctuation, each adjusting all can not exceed certain limit, so repeatedly regulates repeatedly, recovers normally to get final product up to node power;
In addition, in adjustment process, device hardware fault, power regulating range come to a dead end, transmission link interrupts or other any unfavorable factors that may cause power adjustments to proceed if run into, system will end the power adjustment process and give the user unusual bomp, get rid of to make things convenient for fault.
Carry out above-mentioned steps 31 to step 35 at each node circulation in the network, just can realize the automatic control of respective nodes power, guarantee that node power meets normal power level.
Performance number real-time or regularly detection node is meant the luminous power of power detection position set on node in the step 33 of the present invention, normally handle the signal power that export the back through image intensifer, and described step 35 pair node power is adjusted common power adjustments position set on node, among the present invention, the position that need to guarantee the described detection node power of step 33 should be positioned at after the described position that node power is adjusted of step 35, can guarantee that like this processing procedure realizes purpose of the present invention reliably, promptly the effect of power adjustments can embody in the power detection position.
Through the description of front as can be seen, the present invention has realized corresponding target.When the network environment application of reality is of the present invention, because network environment often exists many disturbing factors, so also need to consider some ins and outs when specific implementation, some ins and outs that need consider when again the present invention being used in concrete network environment below describe:
Reference power for the node that obtains by actual detected, consider the physical link noise effect, the original power value that this detection is obtained can not be directly as using with reference to benchmark, must carry out noise compensation before using, concrete compensation rate is relevant with the power level and the system specification index of original power value, usually need pre-configured corresponding power back-off parameter, when node obtains to compensate processing to obtain adjusted calibration power value according to described power back-off parameter behind the reference power original value.
In addition,, need provide corresponding offset, to offset this because the intrinsic difference that system specification index is brought if the node power detection position has different power requirements with the reference data position.Simultaneously, add foregoing noise compensation measure, just can finally obtain signal power fiducial value, promptly available power reference fiducial value near this node actual conditions;
Simultaneously, when reference power detects outside this node and passes to this node by modes such as monitoring and controlling channels, also need the problem considered to be exactly: if system communication occurs when busy or during the smooth factor of other communications, need to consider to handle accordingly at this situation, for example, can utilize other backup data channels to carry out information interaction, perhaps enter wait and obtain reference state, until obtaining reference or ending by the user.
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 claims.
Claims (10)
1, the implementation method of controlling based on the automated power of power detection in a kind of optical-fiber network is characterized in that comprising:
A, be each node configuration reference data on the power control link in the optical-fiber network, described reference data provides the fiducial value of power detection, and the fiducial value of the power detection that provides of described reference data can be upgraded with link condition;
B, the described power of detection are controlled the power of the appointment detection position of each node on the link, and according to reference data and prerequisite described power are adjusted accordingly.
2, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 1 is characterized in that described steps A comprises:
A1, node in the optical-fiber network is configured to a logic power control link according to the direction of business;
A2, be each node configuration reference data on the described logic power control link.
3, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 2 is characterized in that described steps A 2 comprises:
Be each node difference or unified configuration reference data on the described logic power control link, and the performance number that described reference data provides can derive from beyond this intra-node or this node, if from this node outside, then also need to carry out information interaction by optical transmission system monitoring and controlling channels or other feasible data channel;
Described reference data can be a definite calibration power value, also can be a definite power detection position; If reference data is a definite power detection position, then should obtain corresponding performance number in the inquiry of described detection position when needed, and the calibration power value that obtains offered node, if the power detection position of node has different power requirements with the power detection position that reference data is determined, then need the power information that power detection obtains to be adjusted accordingly, thereby obtain the corresponding standard performance number according to the side-play amount that provides.
4, according to the implementation method of controlling based on the automated power of power detection in claim 2 or the 3 described optical-fiber networks, it is characterized in that described steps A 2 comprises:
The calibration power value of described reference data correspondence is the power information by directly the power measurement acquisition is carried out in the relevant position in optical-fiber network, or the power information that obtains of the wavelength number information translation of obtaining by spectrum analysis, or determine by artificial according to network transmission performance;
Described reference data need be controlled the changing condition timing or the real-time update of link according to power.
5, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 4, it is characterized in that, if the calibration power value of reference data correspondence is from this node outside, need carry out noise compensation to it, be specially: preset the power back-off parameter according to optical transmission system specifications parameter and performance index during node configuration, this node carries out the noise compensation processing according to the power back-off parameter of configuration after obtaining reference data original power value, obtains the calibration power value of the required reality of this node.
6, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 1 is characterized in that described step B comprises:
B1, detect the power that each node on the described power control link is specified the detection position in real time;
B2, judge whether the difference between the calibration power value that described power and node reference data provided exceeds the threshold value of setting, if exceed, execution in step B3 then, otherwise, execution in step B1;
B3, power is adjusted according to described difference, after adjustment process finishes, execution in step B1.
7, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 6 is characterized in that described step B2 also comprises:
If the difference between the calibration power value that reference data provided that disposes on the power of node appointment detection position and the corresponding node exceeds the threshold value of setting, whether the appearance of then further judging described difference is owing to the accidental fluctuation of current system causes, if, execution in step B1 then, otherwise, execution in step B3.
8, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 6 is characterized in that described step B3 comprises:
Automatic or manual starts one or more power and adjusts processing procedure, with every logic power control link is the unit independent regulation, and carry out the power adjustment at each node that comprises on by traffic direction on every logic power control link successively to link, after adjustment process finishes, execution in step B1.
9, according in claim 6, the 7 or 8 described optical-fiber networks based on arbitrary implementation method of the automated power of power detection control, it is characterized in that step B3 is described carries out the power adjustment and comprises:
By the attenuation rate of adjustment adjustable optical attenuator, or adjust corresponding laser pumping power and carry out the power adjustment.
10, the implementation method of controlling based on the automated power of power detection in the optical-fiber network according to claim 6 is characterized in that described step B3 comprises:
Described difference is the amplitude that power need be adjusted, if system exists single and adjusts the maximum thresholding that allows to regulate, be that standard is adjusted then not exceed the maximum permission of single adjustment adjustment doors limit value, otherwise directly the amplitude of adjusting is on demand adjusted, and continues execution in step B1 after adjusting is finished.
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| CN101364845B (en) * | 2007-08-08 | 2012-05-23 | 华为技术有限公司 | Method and system for optical power adjustment in wavelength-division network |
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| CN103339877A (en) * | 2012-11-27 | 2013-10-02 | 华为技术有限公司 | Method and device for adjusting optical signal power |
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