CN114389739A - Power balancing method of optical network, optical transport network element and storage medium - Google Patents
Power balancing method of optical network, optical transport network element and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Abstract
The invention discloses a power balancing method of an optical network, an optical transport network element and a storage medium, wherein the power balancing method comprises the steps of obtaining a first target power and a first actual power of an optical signal at an upstream power equalizer and a second target power and a second actual power at a downstream power equalizer; obtaining a power balance gain adjustment quantity of a downstream power equalizer according to the first target power, the first actual power, the second target power and the second actual power; and sending the power equalization gain adjustment amount to a downstream power equalizer to enable the downstream power equalizer to carry out power adjustment. The power balancing method can simultaneously give the power balancing gain adjustment amount to a plurality of power balancing points on the service transmission path, and compared with the traditional power balancing mode of adjusting one by one from an upstream node to a downstream node according to the trend of the service transmission path, the power balancing method can greatly improve the efficiency of power balancing and quickly realize power convergence.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a power balancing method for an optical network, an optical transport network element, and a storage medium.
Background
In a Dense Wavelength Division Multiplexing (DWDM) network, an optical signal carrying service information often needs to pass through a multi-stage amplifier to reach a target node, and in a transmission process of the optical signal on a service path, in order to overcome an unbalanced characteristic caused by the amplifier and an influence caused by nonlinear transfer, power equalization needs to be performed on the optical signal in a network element of the path to ensure transmission quality of the DWDM network.
In the prior art, the conventional power balancing technology needs to consider the mutual influence caused by optical signals in the power balancing process of upstream and downstream network elements, the adjustment needs to be performed on downstream nodes in sequence from an upstream node according to a service transmission path, and each node needs to wait for the completion of the adjustment of an adjacent upstream node, so that the power balancing efficiency is low.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a power balancing method of an optical network, an optical transport network element and a storage medium, which can eliminate the influence of the span gain adjustment of an upstream node on the power balancing of the current network element and improve the power balancing efficiency.
In a first aspect, an embodiment of the present invention provides a power balancing method for an optical network, where the optical network includes an upstream power equalizer and a downstream power equalizer that are arranged on a same service transmission path, and the power balancing method includes:
acquiring a first target power and a first actual power of an optical signal at an upstream power equalizer, and a second target power and a second actual power at a downstream power equalizer;
obtaining a power equalization gain adjustment quantity of the downstream power equalizer according to the first target power, the first actual power, the second target power and the second actual power;
sending the power equalization gain adjustment amount to the downstream power equalizer to enable the downstream power equalizer to carry out power adjustment.
In a second aspect, an embodiment of the present invention provides an optical transport network element of an optical transport network, including at least one processor and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the aforementioned method of power balancing for an optical network.
In a third aspect, an embodiment of the present invention provides a network element, including the optical transport network element of the optical transport network in the second aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to cause a computer to execute the power balancing method for an optical network according to the foregoing first aspect.
In the power equalization method for the optical network provided in the embodiment of the present invention, when power of a power equalizer on a service transmission path is abnormal and power equalization needs to be performed, a power equalization gain adjustment amount needs to be calculated for the power equalizer, and at this time, the power offset condition of the same optical signal at an upstream power equalizer of the power equalizer is considered, so that the calculated power equalization gain adjustment amount excludes the influence caused by upstream cross-section gain adjustment, and thus, the power equalization gain adjustment amount can be simultaneously given to a plurality of power equalization points on the service transmission path.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 2 is a flowchart of obtaining a target power in a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 3 is a flowchart of acquiring channel information in a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 4 is a flowchart of obtaining actual power in a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 5 is a flowchart of determining a power offset in a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 6 is a flowchart of a process of calculating a power equalization gain adjustment amount in a power equalization method according to an embodiment of the first aspect of the present invention;
fig. 7 is a flowchart of determining whether power adjustment is successful in a power balancing method according to an embodiment of the first aspect of the present invention;
fig. 8 is a schematic connection diagram of a power equalization link according to an example one of the present invention;
FIG. 9 is a flow chart of a power equalization method of example one of the present invention;
fig. 10 is a schematic connection diagram of a power balancing link according to example two of the present invention;
FIG. 11 is a flow chart of a power equalization method of example two of the present invention;
fig. 12 is a schematic connection diagram of a power equalization link of example three of the present invention;
fig. 13 is a schematic structural diagram of an apparatus of a network element of an optical transport network according to a second aspect of the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a power equalization method of an optical network, an optical transport network element and a storage medium, when power equalization gain adjustment amount is calculated for a power equalizer, the power offset condition of the same optical signal of an upstream power equalizer of the current power equalizer is considered, and the upstream power offset is eliminated, so that the power equalization gain adjustment amount can be simultaneously given to a plurality of power equalization points on a service transmission path, sequential adjustment from upstream to downstream is not needed, and the power equalization efficiency is improved.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, a first aspect of the embodiment of the present invention provides a power equalization method for an optical network, where the optical network includes an upstream power equalizer and a downstream power equalizer that are disposed on a same service transmission path, and the power equalization method of the embodiment of the present invention includes, but is not limited to, step S100, step S200, and step S300.
Step S100, a first target power and a first actual power of the optical signal at the upstream power equalizer, and a second target power and a second actual power at the downstream power equalizer are obtained.
Optical signals are transmitted in an optical network from a source node to a destination node based on routing information, which gives which nodes the optical signals need to pass through in turn, so that upstream and downstream relations are formed between the nodes. In order to realize power balance of optical signals, the power of each channel in the current node is determined, a power equalizer is arranged in the node, and the power of each channel in the current node is detected through the power equalizer. When the power equalizer detects that the actual power of a channel in the current node deviates from the reference power value by more than a certain limit, the power equalizer triggers the power adjustment of the channel. It can be understood that, in order to implement management of the power equalizers in each node, one or a group of power controllers are further provided in the optical network, and the power controllers are connected to each power equalizer, initiate power query to the power equalizer, and send power adjustment amount to the power equalizer.
In order to determine whether the power offset occurs, an actual value and a reference value of the optical signal at the power equalizer need to be obtained, that is, the actual power and the target power in step S100 correspond to each other, and by comparing the actual power and the target power, it can be known whether the power offset occurs at the current power equalizer. Since the embodiment of the present invention needs to eliminate the influence of the upstream power equalizer on the downstream power equalizer, in step S100, power information of the upstream power equalizer and the downstream power equalizer needs to be obtained, which are the first actual power, the first target power, the second actual power, and the second target power, respectively, and these data are the basis for calculation in step S200. The target power is calculated by the power controller, for example, the power controller sends a power query request to each power equalizer, and at this time, the power equalizer returns channel information of each channel, such as a service wavelength, a transmission bandwidth, a transmission rate, a modulation code pattern, and the like of the channel, and the power controller can calculate the target power corresponding to the power equalizer according to the channel information.
It is understood that the optical network in which power equalization is performed belongs to a DWDM network. The network elements of the DWDM network have service add path and drop path, the add path means that the current network element has new service data added, the current network element multiplexes the new service data and other data into optical signals through wavelength division multiplexing and sends the optical signals to the next port, the drop path means that the node where the current network element is located and the optical signals reach is a target node, and the service data is sent to a terminal through demultiplexing. Therefore, the uplink and the downlink of the current service in the network element all affect the optical signal, which causes power offset of the channel, and power equalization needs to be performed to avoid the influence of the power offset on the subsequent transmission process. It should be noted that the network element where the power equalizer is located does not all only forward the optical signal, and further includes a relay network element that converts the wavelength of the optical signal, and the relay network element is also provided with the power equalizer, and since the power before and after the relay may change, the channel power before and after the relay network element needs to be considered, which will be described later by way of example; in addition, the function of the power equalizer is implemented by another device in some network elements, for example, the power equalization process is implemented by a channel power detector and a channel power executor in an Optical Line Amplifier (OLA) network element, and therefore it should be understood that the power equalizer in the embodiment of the present invention represents a single device or a combination of multiple devices capable of performing channel power query and performing power equalization.
And step S200, obtaining a power equalization gain adjustment quantity of the downstream power equalizer according to the first target power, the first actual power, the second target power and the second actual power.
With the development of an optical network, the number of optical amplifiers in the optical network is increasing, and the number of optical amplifiers through which a service optical signal needs to pass from a source node to a target node is correspondingly increased, because an optical fiber and the optical amplifiers are not ideal devices, the unevenness of channel power is caused by factors such as damage and aging of the optical fiber, nonlinear amplification brought by the optical amplifiers, and the like, a power equalizer needs to be arranged in the node to adjust and compensate the power of a channel where the optical signal is located, so that the signal stability of the optical network is ensured. At present, the power offset at the upstream power equalizer may affect the power at the downstream power equalizer, so when a node in a service transmission path detects a power abnormality, a power equalization adjustment amount needs to be sent to the power equalizer of the node, the power equalizer adjusts the abnormal power according to the power equalization adjustment amount, and after adjustment, the power detected at the downstream power detection point of the power equalizer is also affected, so that it needs to continue to adjust downstream. Obviously, the downstream power equalization needs to wait until the upstream power equalization is completed, the power equalization efficiency is low, the opening of a new service is influenced in the power equalization process, and the optical signal of the new service can be added after the power equalization is completed.
In order to improve the efficiency of power equalization and enable a plurality of power equalizers to perform power equalization in parallel, in the embodiment of the present invention, two actual powers at the upstream power equalizer and the downstream power equalizer are obtained through step S200, and meanwhile, according to two target powers of the upstream power equalizer and the downstream power equalizer, a power equalization gain adjustment amount of the downstream power equalizer is calculated through the four power data. It should be noted that, in a traffic transmission path, power equalization is not usually performed only for one node with abnormal power, and therefore, if a power equalizer of a current node detects abnormal power, performing power equalization on the current node will inevitably affect the power condition of a downstream power equalizer, and therefore, embodiments of the present invention aim to simultaneously send corresponding power equalization gain adjustment amounts to a plurality of power equalizers in the traffic transmission path, so that the plurality of power equalizers simultaneously perform power equalization, thereby improving the efficiency of power equalization. It should be noted that the first power equalizer on the traffic transmission path is not calculated according to this step, because the first power equalizer is located at the most upstream, the power equalization gain adjustment amount cannot be obtained by the method of this step, and the first power equalizer may perform power adjustment according to a conventional or other special power equalization method.
It is understood that the calculation method of the power equalization gain adjustment amount may be adjusted according to the actual condition of the optical network, for example, by a simple subtraction operation, and the upstream power data is subtracted from the downstream power data, so as to eliminate the influence of the upstream power, wherein the calculation method of the power data may also be adjusted according to the actual condition, for example, the square root of the first target power is subtracted from the square root of the first actual power, so as to obtain the upstream power gain amount. The above calculation method is only one feasible example, and the method for calculating the power equalization gain adjustment amount according to the embodiment of the present invention is not limited.
Step S300, sending the power equalization gain adjustment amount to the downstream power equalizer to enable the downstream power equalizer to perform power adjustment.
After the power controller obtains the power equalization gain adjustment amount through the calculation in step S200, the power controller sends the power equalization gain adjustment amount to the downstream power equalizer, so that the downstream power equalizer performs power equalization on the channel with abnormal power according to the power equalization gain adjustment amount. In some cases, the power controller sends a channel power adjustment instruction to the power equalizer while sending the power equalization gain adjustment amount to the power equalizer, and notifies the power equalizer to perform power equalization according to the received power equalization gain adjustment amount by using the instruction, and in other cases, the power equalizer has a function of automatically performing power equalization according to the triggering of the power equalization gain adjustment amount, so that the power controller may not send the channel power adjustment instruction to the power equalizer when sending the power equalization gain adjustment amount, and the power equalizer may automatically trigger to perform power equalization. It can be understood that, after receiving the power equalization gain adjustment amount, power equalizers of different manufacturers may have different power equalization procedures in advance, and the operation modes of the power equalizers are not limited herein.
In some embodiments, referring to fig. 2, the first target power and the second target power are obtained by:
step S210, acquiring first channel information of an optical signal at an upstream power equalizer and second channel information at a downstream power equalizer;
step S220, calculating to obtain a first target power according to the first channel information, and calculating to obtain a second target power according to the second channel information.
The target power and the target power are calculated by the power controller through channel information measured by the power equalizer, the power controller periodically or according to set time sends a power query request to each power equalizer in the optical network, when the power equalizer receives the power query request sent by the power controller, the power controller queries the channel information of each channel passing through the power equalizer, the channel information comprises one or more of channel wavelength, span attenuation, optical fiber type, modulation code rate and speed, and the power controller calculates the target power of each channel at the power equalizer according to the received channel information. Specifically, referring to fig. 3, the method for acquiring the first channel information and the second channel information in the embodiment of the present invention includes the following steps:
step S211, respectively sending power query requests to an upstream power equalizer and a downstream power equalizer;
step S212, receiving the first channel information returned by the upstream power equalizer according to the power query request, and receiving the second channel information returned by the downstream power equalizer according to the power query request.
Since the first target power and the second target power are calculated in the same manner, the first target power will be described as an example. The power controller sends a power query request to the upstream power equalizer, queries first channel information of the upstream power equalizer (the first channel information refers to the channel information of one channel in the upstream power equalizer), and calculates to obtain a first target power according to the first channel information. The embodiment of the invention obtains the channel information of the power equalizer through the power query request, thereby calculating the target power and providing a data basis for calculating the power offset.
In an embodiment, referring to fig. 4, the first actual power and the second actual power are obtained by:
step S230, transmitting the first target power to an upstream power equalizer, and transmitting the second target power to a downstream power equalizer;
and step S240, receiving the first actual power returned by the upstream power equalizer and the second actual power returned by the downstream power equalizer.
In this embodiment, after responding to the power query request of the power controller, the power equalizer receives a target power returned by the power controller, at this time, the power equalizer compares the received target power with an actual power, and when a difference between the target power and the actual power is greater than a set threshold (different power equalizers may have different thresholds), the power equalizer returns the actual power to the power controller to trigger the power controller to perform adjustment calculation. In some embodiments, when detecting that the difference between the target power and the actual power is greater than the set threshold value, the power equalizer sends a power equalization request to the power controller in addition to returning the actual power to the power controller, and the power controller performs adjustment amount calculation according to the received power equalization request and the actual power; in other embodiments, if the power controller has a function of automatically triggering and executing the adjustment amount calculation according to the actual power returned by the power equalizer, then the power equalizer is not required to send a power equalization request at the same time, because the actual power sent by the power equalizer has an identification field, and the power controller can locate to which channel in which power equalizer the current actual power corresponds after receiving the actual power, so as to compare the target power and the actual power inside the power controller, specifically, referring to fig. 5, in an embodiment of calculating the power offset inside the power controller, the power controller further performs the following steps before obtaining the power equalization gain adjustment amount:
step S400, calculating a power deviation value of the second actual power and the second target power;
step S500, determining that the power deviation value exceeds a preset power deviation threshold value.
It can be understood that, in the foregoing embodiment, the power controller needs to receive the actual powers returned by all the power equalizers on the service transmission path, compare the actual powers with the target powers of the corresponding channels, obtain a difference value between the actual powers and the target powers, that is, a power deviation value, and if the power deviation value exceeds a preset power deviation threshold, determine that power equalization needs to be performed.
In summary, through step S210, step S220, step S230 and step S240, power data for calculating the power equalization gain adjustment amount can be obtained, and in an embodiment, referring to fig. 6, the method for calculating the power equalization gain adjustment amount includes the following steps:
step S250, obtaining a target power gain of the optical signal from the upstream power equalizer to the downstream power equalizer according to the first target power and the second target power;
step S260, obtaining the actual power gain of the optical signal from the upstream power equalizer to the downstream power equalizer according to the first actual power and the second actual power;
and step S270, obtaining a power balance gain adjustment amount according to the target power gain and the actual power gain.
With Pd(n) represents the target power of the nth power equalizer, denoted by Pd(n-1) represents the target power of the (n-1) th power equalizer on the same traffic transmission path, denoted by Pa(n) denotes the actual power of the nth power equalizer by Pa(n-1) denotes the actual power of the (n-1) th power equalizer, Gt(n) represents the power equalization gain adjustment amount of the nth power equalizer. Thus, the target power gain G in step S250d(n) the calculation method is as follows:
Gd(n)＝Pd(n)-Pd(n-1)
actual power gain G in step S260a(n) the calculation method is as follows:
Ga(n)＝Pa(n)-Pa(n-1)
power balance gain adjustment G in step S270t(n) the calculation method is as follows:
Gt(n)＝Ga(n)-Gd(n)＝Pa(n)-Pa(n-1)-(Pd(n)-Pd(n-1))
it can be understood that the above-mentioned n-1 power equalizer and nth power equalizer are actually represented as an upstream power equalizer and a downstream power equalizer, and the power conditions of all power equalizers on the service transmission path and the power equalization gain adjustment amount of each power equalizer can be obtained by recursion through the above-mentioned calculation formulas, so that the power equalization gain adjustment amount can be sent to the corresponding power equalizer in parallel, and each power equalizer can independently execute power equalization without executing power equalization in sequence according to the upstream and downstream order, thereby greatly improving the efficiency of power equalization, quickly completing power convergence, satisfying the time requirement for realizing power equalization, and quickly opening and recovering services. In addition, the invention can ensure the channel power balance to safely and effectively land in the complex grid network, and can solve the problem that the normal transmission of the existing service is not influenced when a new service is opened.
After the power controller sends the power equalization gain adjustment amount to the power equalizer, it needs to determine whether each power equalizer successfully executes the power equalization, and therefore, referring to fig. 7, after executing step S300, the embodiment of the present invention further includes the following steps:
step S410, initiating a power query request;
step S420, acquiring the actual power of the downstream power equalizer after being adjusted according to the power equalization gain adjustment amount;
step S430, updating the second actual power according to the adjusted actual power.
And the power controller determines the current actual power of each power equalizer after executing power equalization by re-initiating the power query request, updates the original actual power of the newly obtained actual power, and re-compares whether the difference value between the updated actual power and the target power exceeds a preset power offset threshold value, if so, re-executes power equalization once according to the power equalization method.
By the power equalization method of the embodiment, when power abnormality is detected, the actual power of each power equalizer on the service transmission path and the target power obtained by calculation are obtained, and the gain adjustment quantity G is equalized according to the powertAnd (n) obtaining the power equalization gain adjustment quantity of each power equalizer except the first power equalizer, and sending the power equalization gain adjustment quantity to the corresponding power equalizer, so that each power equalizer on a service transmission path can execute power equalization in parallel.
The following description of embodiments of the invention is given with reference to several practical examples:
example 1
Referring to fig. 8, fig. 8 schematically shows a connection relationship between a power equalizer and a power controller on the same service transmission path in an Optical network, where a network element where each power equalizer is located is a ROADM (Reconfigurable Optical Add-Drop Multiplexer) network element, that is, the power equalizer is embedded in the ROADM network element, and the power controller connects each power equalizer and executes the following power equalization method, referring to fig. 9:
step S501, sending power query requests to power equalizers on the same service transmission path;
step S502, receiving channel information returned by each power equalizer according to the power query request;
step S503, calculating the target power of each power equalizer according to the channel information, and respectively sending the target power to the corresponding power equalizer;
step S504, receiving a power equalization request and an actual power returned by the power equalizer, wherein the power equalization request is sent after the power equalizer judges that the difference value between the actual power and the received target power is larger than an offset threshold value;
step S505, executing primary power equalization, and obtaining power equalization gain adjustment quantity of each power equalizer according to the target power and the actual power of the upstream and downstream power equalizers;
step S506, the power equalization gain adjustment amount is sent to the corresponding power equalizer, so that the power equalizer executes power equalization adjustment in parallel;
step S507, sending a power query request to determine the actual power of each power equalizer on the current service transmission path, entering a monitoring state if the difference between the actual power after power equalization and the target power does not exceed the offset threshold, otherwise, re-executing the steps S505 to S506.
Wherein, the power balance gain adjustment quantity is calculated according to the following formula:
Gt(n)＝Ga(n)-Gd(n)＝Pa(n)-Pa(n-1)-(Pd(n)-Pd(n-1))
Pd(n) represents a target power of the nth power equalizer toPd(n-1) represents the target power of the (n-1) th power equalizer on the same traffic transmission path, denoted by Pa(n) denotes the actual power of the nth power equalizer by Pa(n-1) denotes the actual power of the (n-1) th power equalizer, Gt(n) represents the power equalization gain adjustment amount of the nth power equalizer, Ga(n) denotes the actual power gain of the nth power equalizer, Gd(n) represents a target power gain of the nth power equalizer.
In the step S507, the monitoring state may be that the power controller sends a power query request at intervals, or that the power controller triggers sending a power query request according to a service request.
Through the steps S501 to S507, the ROADM network element on the service transmission path can execute power equalization in parallel, so that each power equalizer can independently execute power equalization without sequentially executing power equalization according to the upstream and downstream sequences, the efficiency of power equalization is greatly improved, and power convergence is quickly completed.
Example two
Referring to fig. 10, fig. 10 schematically shows a connection relationship between power equalizers and power controllers on the same traffic transmission path in an optical network, where a network element where one power equalizer is located is a relay network element, and network elements where the other power equalizers are located are ROADM network elements.
The power controller is connected to each power equalizer, and the power equalization method performed in the ROADM network element is the same as the power equalization method of example one, but the difference is the power equalization method performed in the relay network element, the power equalizers are respectively provided before and after the relay, and the two power equalizers are respectively adjusted according to the channel wavelength conditions before and after the relay, see fig. 11:
step S601, sending power query requests to power equalizers on the same service transmission path;
step S602, identifying the position of the relay network element in the route according to the service transmission path, and receiving channel information of the channel wavelength before the relay network element and the channel wavelength after the relay network element;
step S603, obtaining target powers of front and rear wavelength channels of the relay network element according to channel information of the front channel wavelength of the relay network element and the rear channel wavelength of the relay network element, and sending the target powers to a power equalizer in the relay network element, wherein the front and rear power equalization points of the power equalizer of the relay network element respectively receive corresponding target powers;
step S604, receiving a power equalization request and an actual power returned by the power equalizer, wherein the power equalization request is sent after the power equalizer judges that the difference value between the actual power and the received target power is larger than an offset threshold value;
step S605, executing primary power equalization, and obtaining power equalization gain adjustment quantity of each power equalizer according to the target power and the actual power of the upstream and downstream power equalizers;
step S606, the power equalization gain adjustment quantity is sent to the corresponding power equalizer, so that the power equalizer executes power equalization adjustment in parallel, wherein the power equalizer of the relay network element executes power equalization according to the respective power equalization gain adjustment quantities of the front and rear power equalization points;
step S607, checking the actual power of each power equalizer after power equalization, and determining whether the power equalization is successful.
The calculation formula of the power equalization gain adjustment amount is the same as that in the first example, and is not described again here. For the two power equalization points before and after the relay network element, the two power equalization points before and after the relay network element can be actually regarded as two power equalizers before and after, so the power equalization is also performed according to the above calculation formula.
Example three
Referring to fig. 12, fig. 12 schematically shows a connection relationship between a power equalizer and a power controller on the same traffic transmission path in an optical network, where a network element where a part of the power equalizers are located is an OLA network element, and a network element where another part of the power equalizers are located is a ROADM network element. For convenience of description later, the channel power detector and the channel power executor in the OLA network element are represented by a power equalizer. The power controller connects the respective power equalizers and performs the power equalization method as in steps S501 to S507.
A second aspect of an embodiment of the present invention provides an optical transport network element, including at least one processor and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of power balancing for an optical network of the aforementioned first aspect.
Referring to fig. 13, it is exemplified that the control processor 1001 and the memory 1002 in the optical transport network element 1000 may be connected by a bus. The memory 1002, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, the memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk memory, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1002 may optionally include memory located remotely from the control processor 1001, which may be connected to the optical transport network element 1000 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the arrangement shown in fig. 13 does not constitute a limitation of the optical transport network element 1000 and may comprise more or less components than those shown, or some components may be combined, or a different arrangement of components.
By executing the power balancing method of the first aspect in the network element, the power balancing gain adjustment amount can be simultaneously given to a plurality of power balancing points on the service transmission path, and compared with a traditional power balancing mode in which the adjustment is performed one by one from an upstream node to a downstream node according to the trend of the service transmission path, the power balancing efficiency can be greatly improved and the power convergence can be rapidly realized.
A third aspect of embodiments of the present invention provides a computer-readable storage medium, having stored thereon computer-executable instructions, the computer-executable instructions are executed by one or more control processors, e.g., by one of the control processors 1001 in fig. 13, the one or more control processors may be caused to perform the method of power balancing for an optical network in the above method embodiments, for example, the above-described method steps S100 to S300 in fig. 1, method steps S210 to S220 in fig. 2, method steps S211 to S212 in fig. 3, method steps S230 to S240 in fig. 4, method steps S400 to S500 in fig. 5, method steps S250 to S270 in fig. 6, method steps S410 to S430 in fig. 7, method steps S501 to S507 in fig. 9, and method steps S601 to S607 in fig. 11 are performed.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (10)
1. A power equalization method for an optical network, the optical network including an upstream power equalizer and a downstream power equalizer disposed on a same traffic transmission path, the power equalization method comprising:
acquiring a first target power and a first actual power of an optical signal at an upstream power equalizer, and a second target power and a second actual power at a downstream power equalizer;
obtaining a power equalization gain adjustment quantity of the downstream power equalizer according to the first target power, the first actual power, the second target power and the second actual power;
sending the power equalization gain adjustment amount to the downstream power equalizer to enable the downstream power equalizer to carry out power adjustment.
2. The method according to claim 1, wherein the first target power and the second target power are obtained by:
acquiring first channel information of an optical signal at the upstream power equalizer and second channel information at the downstream power equalizer;
and calculating to obtain a first target power according to the first channel information, and calculating to obtain a second target power according to the second channel information.
3. The method according to claim 2, wherein the channel information comprises one or more of a span attenuation, a transmission bandwidth, a transmission rate, a modulation code pattern used, and a fiber type used for transmitting the optical signal in the current network element.
4. The method of claim 2, wherein obtaining the first channel information of the optical signal at the upstream power equalizer and the second channel information at the downstream power equalizer comprises:
respectively sending power query requests to the upstream power equalizer and the downstream power equalizer;
and receiving first channel information returned by the upstream power equalizer according to the power query request, and receiving second channel information returned by the downstream power equalizer according to the power query request.
5. The method according to claim 1 or 2, wherein the first actual power and the second actual power are obtained by:
transmitting the first target power to the upstream power equalizer and the second target power to the downstream power equalizer;
and receiving a first actual power returned by the upstream power equalizer and a second actual power returned by the downstream power equalizer.
6. The method of claim 1, wherein before obtaining the power equalization gain adjustment, the method further comprises:
calculating a power deviation value of the second actual power and the second target power;
determining that the power deviation value exceeds a preset power deviation threshold value.
7. The method according to claim 1, wherein the obtaining the power equalization gain adjustment amount of the downstream power equalizer according to the first target power, the first actual power, the second target power, and the second actual power comprises:
obtaining a target power gain of the optical signal from the upstream power equalizer to the downstream power equalizer according to the first target power and the second target power;
obtaining an actual power gain of the optical signal from the upstream power equalizer to the downstream power equalizer according to the first actual power and the second actual power;
and obtaining the power balance gain adjustment quantity according to the target power gain and the actual power gain.
8. The method of power equalization for an optical network of claim 1, wherein after sending the power equalization gain adjustment to the downstream power equalizer, further comprising:
initiating a power query request;
acquiring the actual power of the downstream power equalizer after being adjusted according to the power equalization gain adjustment quantity;
and updating the second actual power according to the adjusted actual power.
9. An optical transport network element comprising at least one processor and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of power balancing for an optical network according to any one of claims 1 to 8.
10. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform a method of power balancing for an optical network as claimed in any one of claims 1 to 8.
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| CN202011140487.5A CN114389739A (en) | 2020-10-22 | 2020-10-22 | Power balancing method of optical network, optical transport network element and storage medium |
| PCT/CN2021/123110 WO2022083470A1 (en) | 2020-10-22 | 2021-10-11 | Power equalization method for optical network, optical transport network network element, and storage medium |
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| CN202011140487.5A CN114389739A (en) | 2020-10-22 | 2020-10-22 | Power balancing method of optical network, optical transport network element and storage medium |
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| CN1288859C (en) * | 2003-09-23 | 2006-12-06 | 华为技术有限公司 | Dynamic gain balance system and method of realizing same |
| WO2014082200A1 (en) * | 2012-11-27 | 2014-06-05 | 华为技术有限公司 | Optical signal power regulation method and device |
| CN103227681B (en) * | 2013-05-17 | 2016-07-06 | 烽火通信科技股份有限公司 | Wave division multiplexing optical transmission system passage dynamic optical power regulating method |
| US9231796B2 (en) * | 2013-11-25 | 2016-01-05 | Globalfoundries Inc. | Power aware equalization in a serial communications link |
| US10547404B1 (en) * | 2018-11-13 | 2020-01-28 | Ciena Corporation | Automatic optical link calibration with channel holders |
| CN111262643B (en) * | 2018-11-30 | 2022-02-11 | 中国移动通信集团山东有限公司 | Power adjustment control method and device |
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