CN111181636B - Optical network monitoring method - Google Patents
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- CN111181636B CN111181636B CN202010102706.4A CN202010102706A CN111181636B CN 111181636 B CN111181636 B CN 111181636B CN 202010102706 A CN202010102706 A CN 202010102706A CN 111181636 B CN111181636 B CN 111181636B
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
Abstract
The embodiment of the invention provides an optical network monitoring method, which comprises the following steps: determining an optical label power measurement value of each span section of each service link in an optical network; calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link; and monitoring the optical network based on the current corrected label value of each span section of each service link meeting the preset iteration condition. The method provided by the embodiment of the invention can effectively improve the accuracy and reliability of optical network monitoring. In addition, the optical label power measurement value can be obtained by only directly detecting the photoelectric detector with low bandwidth, so that the cost of optical network monitoring is effectively reduced.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to an optical network monitoring method.
Background
With the explosive growth of various high-bandwidth services and emerging applications, the optical network as an information highway develops toward high capacity, high efficiency and intellectualization, the optical network architecture becomes more complex and large, the connection is more dynamic and flexible, and an effective optical network monitoring technology is urgently needed to ensure the stable and efficient operation of the complex optical network.
In a Dense Wavelength Division Multiplexing (DWDM) large-scale optical network, not only are the number of Wavelength channels large and the channel intervals small, but also optical signals often need to go through a plurality of optical cross nodes, and Wavelength paths dynamically change, so that optical network faults caused by optical cross connection errors easily occur. Therefore, the DWDM optical network needs to implement the functions of monitoring the state of each wavelength channel in each cross node and determining and positioning the fault by means of the monitoring technology.
Currently, for monitoring a DWDM optical network, expensive optical devices are generally needed, and due to the complexity of the DWDM optical network, the accuracy and reliability of the monitoring result are low.
Disclosure of Invention
The embodiment of the invention provides an optical network monitoring method, which is used for solving the problems of high cost and low accuracy of optical network monitoring.
In a first aspect, an embodiment of the present invention provides an optical network monitoring method, including:
determining an optical label power measurement value of each span section of each service link in an optical network;
calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link;
and monitoring the optical network based on the current corrected label value of each span section of each service link meeting the preset iteration condition.
Preferably, the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, and the optical tag power measurement value and the last modified tag value of each span of each service link specifically includes:
for any span of any service link, calculating the gain of each remaining service link in the any span on the optical tag power of the any service link based on an SRS power transfer mechanism and a last corrected tag value of each service link in the any span, and taking the gain as the current power correction quantity of the any span of the any service link;
and determining the current corrected tag value of any span of any service link based on the optical tag power measurement value and the current power correction quantity of any span of any service link and the current power correction quantity of each span before any span.
Preferably, the calculating, for any span of any service link, a gain of an optical label power of each remaining service link in the any span to the any service link based on an SRS power transfer mechanism and a last modified label value of each service link in the any span, as a current power correction amount of the any span of the any service link, specifically includes:
calculating the current power correction quantity delta P of any span of any service link based on the following formulaj，k，m：
Wherein j is the wavelength channel number corresponding to any service link, k is the current iteration number, m is the number of the cross-sections experienced by the service signal corresponding to any service link, and Pj，k，mThe number j of the wavelength channel, the iteration number k, the last corrected label value corresponding to the number m of the experienced segments, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffRespectively the effective length and the effective area of the optical fiber.
Preferably, the determining a current corrected tag value of any span of any service link based on the optical tag power measurement value and the current power correction amount of any span of any service link and the current power correction amount of each span before any span specifically includes:
determining a current revised tag value for said any span of said any traffic link based on the following formula:
in the formula, Pj，mAnd Pj，k+1，mThe optical label power measured value and the current corrected label value of any span of any service link are respectively.
Preferably, the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, the optical tag power measurement value and the last modified tag value of each span of each service link further includes:
and performing deviation correction on each optical label power measurement value affected by the chromatic dispersion effect.
Preferably, the performing deviation correction on the power measurement value of each optical label affected by the chromatic dispersion effect specifically includes:
calculating relative phase delay on each wavelength channel of each span section based on the link configuration information and the label frequency information of the optical network;
determining the contribution proportion of other wavelength channels in the optical label power measurement value of each wavelength channel of each span section based on the SRS crosstalk amount of each wavelength channel of each span section;
determining the measured value deviation of any wavelength channel of any span caused by chromatic dispersion based on the relative phase delay and the contribution proportion of any wavelength channel of any span;
and correcting the optical label power measurement value of any wavelength channel of any span section based on the measurement value deviation of any wavelength channel of any span section.
Preferably, the calculating a relative phase delay on each wavelength channel of each span based on the link configuration information and the tag frequency information of the optical network specifically includes:
calculating the relative phase delay on any wavelength channel of any span section based on the following formula:
Δtm，j＝D·mL·jΔλ；
in the formula,. DELTA.tm，jThe relative phase delay of the jth wavelength channel of the mth span is adopted, D is a dispersion coefficient, L is the optical fiber length of a single span, and Delta lambda is the wavelength channel interval of the optical network;
the determining, based on the SRS crosstalk amount of each wavelength channel of each span, the contribution ratio of other wavelength channels in the optical tag power measurement value of each wavelength channel of each span specifically includes:
calculating the remaining power P of any wavelength channel of any span section after SRS crosstalk based on the following formulam，j，restAnd crosstalk power P to other wavelength channels im，j，i：
In the formula, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffThe effective length and the effective area of the optical fiber are respectively; pj，mAn optical tag power measurement for an mth span jth wavelength channel;
the determining, based on the relative phase delay and the contribution ratio of any one wavelength channel of any span, a measured value deviation of any one wavelength channel of any span caused by chromatic dispersion specifically includes:
calculating dispersion correction coefficient x of any wavelength channel of any span based on the following formulam，jA 1 is to Pj，m·xm，jAs the measured value deviation:
in the formula, 1i is a complex unit, ωjThe frequency of the optical label of the jth channel.
Preferably, the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, the optical tag power measurement value and the last modified tag value of each span of each service link further includes:
based on a preset up-down correction rule, correcting the last corrected label value of each span section of each service link;
the preset up-down correction rule is used for correcting the optical label power deviation of the self and other channels caused by the up-down of the service signal corresponding to the service link.
Preferably, the modifying the last modified tag value of each span of each service link based on the preset add/drop correction rule specifically includes:
compensating the last corrected label value of the downlink span of any service link based on the compensation power value of any service link; the compensation power value is the power value of other wavelength channels transferred to the downlink wavelength channel on the previous span of the downlink span;
updating the difference between the last corrected label value of the uplink span of any service link and the residual power value of any service link to be the last corrected label value of the uplink span; and the residual power value is the power value of the wavelength channel transferred from the downlink wavelength channel to other wavelength channels on the previous span of the downlink span.
Preferably, the preset iteration condition is that the current iteration number reaches the maximum span number of each service link.
In a second aspect, an embodiment of the present invention provides an optical network monitoring apparatus, including:
the measuring unit is used for determining the optical label power measuring value of each span section of each service link in the optical network;
the iteration correction unit is used for calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link;
and the monitoring unit is used for carrying out optical network monitoring based on the current corrected label value of each span section of each service link meeting the preset iteration condition.
In a third aspect, an embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a bus, where the processor and the communication interface, the memory complete mutual communication through the bus, and the processor may call a logic command in the memory to perform the steps of the method provided in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method as provided in the first aspect.
The optical network monitoring method provided by the embodiment of the invention is based on an SRS power transfer mechanism, corrects the optical label power measurement value of each span section of each service link in the optical network, and carries out optical network monitoring based on the corrected label value, thereby effectively improving the accuracy and reliability of optical network monitoring. In addition, the optical label power measurement value can be obtained by only directly detecting the photoelectric detector with low bandwidth, so that the cost of optical network monitoring is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an optical network monitoring method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical network monitoring system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of monitoring power of an optical tag according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical network monitoring apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, wavelength channel identification and performance monitoring of an optical network can be realized by means of an optical label, and the optical network monitoring method based on the optical label has the advantages of simplicity in operation and rich monitoring amount. However, in the case of a DWDM network with multiple spans and multiple wavelength channels, the Stimulated Raman Scattering (SRS) effect causes the energy of a short wavelength channel to be shifted to a long wavelength channel, even in the case of no wavelength drop, the power of each optical label directly detected at a node is not in proportion to the optical power of the wavelength channel affected by the Raman effect, and it is difficult for the optical label to accurately reflect the power of the current wavelength link. In the case of a wavelength drop, the optical label carried by the drop wavelength still exists due to the stimulated raman scattering effect, so it is difficult to determine whether the label is generated by crosstalk or due to no drop of the wavelength. Particularly, crosstalk starts to be superposed when a plurality of spans exist, the situation becomes complicated, and an accurate monitoring result is difficult to obtain by the existing optical network monitoring method based on the optical label. In view of this, the embodiment of the present invention provides an optical network monitoring method, which may be applied to a DWDM network and may also be applied to other types of optical networks. Fig. 1 is a schematic flow chart of an optical network monitoring method according to an embodiment of the present invention, as shown in fig. 1, the method includes:
The optical network here is the optical network to be monitored. In the optical network, all the upper signals are marked with low-frequency top-tuning signals, namely optical labels. In an optical network, multiple wavelength channels can be simultaneously added and transmitted in multiple spans. For any traffic signal, all the spans passed by the traffic signal from the upper path to the lower path can be used as a traffic link.
At each node of the optical network, light splitting can be realized by arranging a coupler and the like, and then a part of signals obtained by light splitting are monitored to obtain an optical label power measurement value at each node. The optical label power measurement values at the nodes obtained in this way may be separated by means of Fast Fourier Transform (FFT) or the like, so as to obtain optical label power measurement values of the wavelength channels, and thus correspond to the optical label power measurement value of each span of each service link in the optical network.
It should be noted that, since a low-frequency optical tag is used, the power measurement value of the optical tag can be obtained by a low-bandwidth direct-detection photodetector such as a PD (Photo-Diode).
Specifically, after the optical tag power measurement value of each span of each service link is obtained, iterative compensation can be performed on the optical tag power measurement value based on an SRS power transfer mechanism, so that the deviation of the optical tag power measurement value due to the stimulated raman scattering effect is corrected, and the problem that the optical tag power measurement value cannot accurately measure the power of the wavelength link is solved.
Firstly, based on an SRS power transfer mechanism and an optical label power measured value of each span of each service link, correcting the optical label power measured value of each span of each service link to obtain a first corrected label value of each span of each service link. Here, the corrected tag value is a power value obtained by correcting the optical tag power measurement value.
And then, based on an SRS power transfer mechanism, and the optical label power measurement value and the first corrected label value of each span of each service link, carrying out a new iteration correction to obtain a second corrected label value of each span of each service link.
And repeating the steps, and performing a new iteration correction based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span of each service link to obtain the current corrected label value of each span of each service link.
Specifically, after each iterative correction, whether a preset iterative condition is met or not is judged, if yes, the iterative correction is stopped, and if not, the iterative correction is continued. Here, the preset iteration condition may be a preset maximum number of iteration correction, and if the current iteration number reaches the maximum number, the iteration is stopped; the preset iteration condition may also be a minimum difference between the current corrected tag value and the last corrected tag value, and if the difference between the current corrected tag value and the last corrected tag value of each span of each service link is smaller than the minimum difference, the iteration is stopped.
After the iterative correction is stopped, the current corrected tag value of each span section of each service link can be used as a channel-associated optical tag power monitoring result which is close to the power of the actual wavelength link after the SRS power transfer correction is finished, and the channel-associated optical tag power monitoring result is applied to optical network monitoring.
Here, the optical network monitoring may specifically be to determine the performance status or the fault type of each service link according to the monitoring result of the optical label power associated with the path. If the channel associated optical label power monitoring result of a certain channel is not in accordance with the expectation, probably because the channel is wrongly dropped or added, the fault type can be further confirmed by detecting the frequency of the channel associated label of the wavelength channel; if the channel associated optical label power monitoring results of all channels are not consistent with the expectation, the optical fiber link may be damaged.
The method provided by the embodiment of the invention is based on the SRS power transfer mechanism, corrects the optical label power measured value of each span section of each service link in the optical network, and monitors the optical network based on the corrected label value, thereby effectively improving the accuracy and reliability of optical network monitoring. In addition, the optical label power measurement value can be obtained by only directly detecting the photoelectric detector with low bandwidth, so that the cost of optical network monitoring is effectively reduced.
Based on the above embodiment, step 120 specifically includes:
step 121, for any span of any service link, based on the SRS power transfer mechanism and the last modified tag value of each service link in the span, calculating the gain of each remaining service link in the span to the optical tag power of the service link, as the current power correction amount of the span of the service link.
Specifically, for any service link, the gain of the last corrected tag value of each service link in the span, except for the service link itself, to the last corrected tag value of the service link is calculated, and the gain is used as the current power correction amount of the span of the service link. Here, the current power correction amount may be a positive value or a negative value, the increased value representing the gain and the negative value representing the attenuation.
Step 121 is performed for each span of the service link, so as to obtain the current power correction amount of each span of the service link.
Step 122, determining a current corrected tag value of the span of the service link based on the optical tag power measurement value and the current power correction amount of the span of the service link and the current power correction amount of each span before the span.
Specifically, assuming that the span is the 5 th span of the service link, each span before the span includes the 1 st to 4 th spans of the service link. The current corrected tag value of the span of the service link can be obtained by accumulating the optical tag power measurement value and the current power correction value of the span of the service link and the current power correction value of each span before the span.
Step 122 is performed for each span of the service link, so as to obtain the current corrected tag value of each span of the service link.
Based on any of the above embodiments, step 121 specifically includes:
calculating the current power correction quantity delta P of any span of any service link based on the following formulaj，k，m：
Wherein j is the wavelength channel number corresponding to any service link, k is the current iteration number, m is the number of the cross-sections experienced by the service signal corresponding to any service link, and Pj，k，mThe number j of the wavelength channel, the iteration number k, the last corrected label value corresponding to the number m of the experienced segments, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffRespectively the effective length and the effective area of the optical fiber.
Further, m is a span number of any span of any service link, i.e. the number of spans experienced by the service signal of the service. Pi，k，mAnd i is the wavelength channel number corresponding to any service link in the span.
According to the formula, in the first iteration under the current condition, when j is less than n/2, the current correction amount is negative, and the corrected result is smaller than the optical label power measured value; when j is larger than n/2, the current correction amount is positive, and the corrected result is larger than the optical label power measured value.
Based on any of the above embodiments, step 122 specifically includes:
determining a current revised tag value for any span of any traffic link based on the following formula:
in the formula, Pj，mAnd Pj，k+1，mRespectively, the optical label power measurement value and the current corrected label value, delta P, of any span of any service linkj，k，iThe current power correction amount of the span of the service link and any span before the span. It can be seen that the current corrected tag value of any span of any service link is determined by the optical tag power measurement value P of that span of that service linkj，mThe sum of the current power corrections of the span and any span preceding the span
And accumulating the obtained result.
Based on any embodiment, further comprising between step 110 and step 120: and performing deviation correction on each optical label power measurement value affected by the chromatic dispersion effect.
Specifically, chromatic dispersion refers to an optical pulse broadening phenomenon caused by different group velocities of different wavelength components in a light source spectrum in an optical fiber, and is a main transmission damage of a high-speed optical fiber system. The accuracy and the reliability of the optical network monitoring can be further improved by correcting the deviation of each optical label power measurement value influenced by the chromatic dispersion,
based on any of the above embodiments, the performing deviation correction on the power measurement value of each optical label affected by chromatic dispersion effect specifically includes:
step 101, calculating a relative phase delay on each wavelength channel of each span section based on link configuration information and tag frequency information of the optical network.
Specifically, for any wavelength channel of any span, the relative phase delay of the wavelength channel of the span, that is, the phase delay of the optical tag power on the wavelength channel of the span, which is generated by chromatic dispersion, relative to the wavelength channel that is not transmitted through the optical fiber. Here, the link configuration information may include a fiber length of a single span, and the tag frequency information may include a wavelength channel spacing.
Step 102, determining the contribution ratios of other wavelength channels in the optical label power measurement value of each wavelength channel in each span section based on the SRS crosstalk amount of each wavelength channel in each span section.
Specifically, for any wavelength channel of any span, the SRS crosstalk amount of each wavelength channel of the span is calculated, so as to obtain the contribution ratio of the optical label of each remaining wavelength channel of the same span to the optical label measurement value of the wavelength channel in the optical label power measurement value detected by the wavelength channel of the span.
Step 103, determining the measured value deviation of any wavelength channel of any span section caused by chromatic dispersion based on the relative phase delay and contribution ratio of any wavelength channel of any span section.
Step 104, based on the deviation of the measured value of the wavelength channel across the segment, correcting the measured value of the optical label power of the wavelength channel across the segment.
Based on any of the above embodiments, step 101 specifically includes:
calculating the relative phase delay on any wavelength channel of any span section based on the following formula:
Δtm，j＝D·mL·jΔλ；
in the formula,. DELTA.tm，jIs the relative phase delay of the jth wavelength channel of the mth span, D is the dispersion coefficient, L is the fiber length of a single span, and Delta lambda is the wavelength channel interval of the optical network.
Step 102 specifically includes:
calculating the remaining power P of any wavelength channel of any span section after SRS crosstalk based on the following formulam，j，restTo do so byAnd crosstalk power P to other wavelength channels im，j，i：
In the formula, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffThe effective length and the effective area of the optical fiber are respectively; pj，mIs the optical tag power measurement for the mth span jth wavelength channel.
Step 103 specifically comprises:
calculating dispersion correction coefficient x of any wavelength channel of any span based on the following formulam，jA 1 is to Pj，m·xm，jAs measured value deviations:
in the formula, 1i is a complex unit, ωjThe frequency of the optical label of the jth channel.
Based on any of the above embodiments, step 120 further includes: based on a preset up-down correction rule, correcting the last corrected label value of each span section of each service link; the preset up-down path correction rule is used for correcting the optical label power deviation of the self and other channels caused by the up-down path and the down path of the service signal corresponding to the service link.
Specifically, the uplink and downlink correction is performed before the iterative correction is performed based on the SRS power transfer mechanism in step 120, and the uplink and downlink correction is required each time before step 120 is performed. Specifically, after determining the optical tag power measurement value in step 110, the optical tag power measurement value of each span of each service link may be corrected based on a preset add/drop correction rule, and then a first corrected tag value of each span of each service link may be calculated based on the SRS power transfer mechanism and the optical tag power measurement value of each span of each service link.
And correcting the first corrected label value of each span of each service link based on a preset uplink and downlink correction rule aiming at the first corrected label value of each span of each service link, and then calculating a second corrected label value of each span of each service link based on an SRS power transfer mechanism, an optical label power measured value of each span of each service link and the first corrected label value.
And repeating the steps, correcting the last corrected label value of each span section of each service link based on a preset uplink and downlink correction rule, and then performing a new iteration correction based on an SRS power transfer mechanism, the optical label power measurement value of each span section of each service link and the last corrected label value to obtain the current corrected label value of each span section of each service link.
Based on any of the above embodiments, the modifying, based on the preset correction rule for going to and going from the next route, the last modified tag value of each span of each service link specifically includes:
compensating the last corrected label value of the downlink span of the service link based on the compensation power value of any service link; the compensation power value is the power value of other wavelength channels transferred to the downlink wavelength channel on the previous span of the downlink span; updating the difference between the last corrected label value of the uplink span of the service link and the residual power value of the service link into the last corrected label value of the uplink span; the residual power value is the power value of the wavelength channel transferred to other wavelength channels on the previous span of the downlink span.
Specifically, for the uplink and downlink correction of the last corrected tag value of the downlink span of any service link, the compensation power value of the service link needs to be added to the last corrected tag value of the downlink span. For the uplink and downlink correction of the last corrected tag value of the uplink span of any service link, the last corrected tag value of the uplink span needs to be subtracted from the remaining power value of the service link.
Further, the upper and lower lane correction can be classified into the following 5 cases:
case 1: when the service in the wavelength channel is dropped at a certain span, the compensation power value of the service link is added with the last corrected label value of the next span, so as to complete the compensation of the influence of the wavelength channel dropping on the label power measurement values of other wavelength channels. The down wavelength channel is set to 0.
Case 2: and when the uplink appears in a certain span section in the wavelength channel, subtracting the last corrected label value of the uplink span section from the residual power value of the service link according to the residual label calculated by the B. And completing the compensation of the detection distortion of the optical label power of the path caused by the residual optical label power of the path remained on other wavelength channels.
Case 3: when the wavelength channels are simultaneously added and dropped in a certain span, calculation is carried out according to the sequence of the case 1 and the case 2.
Case 4: when no service is going on/off the path on the wavelength channel, if the previous going-on/off-path event is going off the path, processing according to the condition 1; if the previous up-down event is up, processing is performed as per case 2.
Case 5: the duplicate entry and duplicate exit are reported in error, except for the special case specified in case 3.
Based on any of the above embodiments, in step 130, the preset iteration condition is that the current iteration number reaches the maximum span number of each service link. Here, the maximum number of segments is the maximum number of segments per traffic link in the optical network.
Based on any of the above embodiments, fig. 2 is a schematic structural diagram of an optical network monitoring system provided by an embodiment of the present invention, as shown in fig. 2, a DWDM network has N wavelength channels in total, services of the N wavelength channels are simultaneously added, incident light power is 0dBm, the incident light power is transmitted through 20 spans, each span is amplified by an EDFA (erbium doped fiber amplifier), EDFA gain coefficients are not completely the same at each wavelength, and chromatic dispersion value of a standard single-mode fiber is 16ps/km "nm. Here, let N be 80.
In the monitoring system shown in fig. 2, the optical network monitoring method includes the following steps:
in step 211, all the add signals are marked with low-frequency tune signals, i.e. optical labels. The optical label is generally selected to be in MHz magnitude, and the top-adjusting depth is less than 5%. In the embodiment of the invention, the number of the optical labels is 80, the range of the optical labels is 1 MHz-5 MHz, and different wavelength channels have optical labels with different frequencies, so that the optical labels can be used as wavelength channel IDs (identity) and the wavelength channel interval is 50 KHz.
In step 212, the signals of the multiple channels are combined into a WDM signal by a wavelength division multiplexer and transmitted through an optical fiber.
And step 221, utilizing the X-type coupler to divide most of the signals in the main channel for continuous transmission, and a small part of the signals enter the node optical tag monitoring module for monitoring.
In step 222, a low-frequency optical label is used, and a low-cost low-bandwidth direct detection receiver (PD) is used to monitor signal reception.
The analog-to-digital converter converts the analog signal to a digital signal for subsequent Digital Signal Processing (DSP), step 223.
In step 224, the DSP processing unit first performs RF spectrum analysis on the received signal. And performing FFT on the received signals, wherein the purpose of the FFT is to separate the monitoring signals loaded in the wavelength channels so as to obtain the optical label power measurement value of each wavelength channel. According to the wavelength channel number N being 80, the embodiment of the present invention should have 80 independent monitoring signals on the frequency spectrum.
first, the bias correction is performed on each optical label power measurement affected by chromatic dispersion effects. Assuming that the dispersion coefficient is 16ps/km × nm, the length of a single span is 100km, the wavelength channel interval is 50GHz and is about 0.4nm, so that the maximum time delay is about 1.12us, and the correction coefficient is 1.0023, calculating the deviation of the measured value caused by chromatic dispersion based on the correction coefficient, so as to correct the measured value of the optical label power of the wavelength channel corresponding to the corresponding span from 9.977e-4 to 1 e-3.
After the chromatic dispersion effect correction of all the optical label power measurement values is completed, an optical label matrix is generated, each row of the optical label matrix represents one wavelength channel, each column represents one span, and the elements of the optical label matrix are the optical label power measurement values after the chromatic dispersion effect correction corresponding to a certain wavelength channel and the span. In an embodiment of the invention, the tag matrix is an 80 x 20 matrix.
And generating a business matrix according to a preset uplink and downlink rule. Each row of the service matrix represents a wavelength channel, each column represents a span, and the element of the service matrix is the number of spans passed by the service in the link. In the embodiment of the present invention, the traffic matrix is an 80 × 20 matrix.
Then, all the spans that a service signal passes from the upper path to the lower path are taken as a service link. And starting from the first span of the service link, calculating the gain or attenuation of other link labels except the service link label to be corrected of the current span to the optical label power value of the service link, and taking the calculation result as the current power correction quantity of the span of the service link.
And taking the sum of the current power correction quantity of the first span and the optical label power measurement value of the first span as the current corrected label value of the first span, and taking the sum of the current power correction quantity of the first span and the optical label power measurement value of the second span as the current corrected label value of the second span. And so on until the current corrected tag value of the last span is calculated.
And finishing one iteration of all the spans of all the service links after obtaining the current corrected label values of all the service links. And repeating the iteration steps until the iteration times are equal to the longest span number in the service link, and obtaining the last current corrected label value as a channel associated optical label power monitoring result of each service link. In the embodiment of the present invention, the maximum number of iterations is 20. After the iteration which is the same as the maximum span number of the service is carried out, the corrected monitoring result of the power of the optical label along the path can be close to the true value.
In step 231, the optical network performance and fault analysis module determines the performance status or fault type of each service link based on the channel associated optical label power monitoring result of each service link. If the channel associated optical label power monitoring result of a certain channel is not in accordance with the expectation, probably because the channel is wrongly dropped or added, the fault type can be further confirmed by detecting the frequency of the channel associated label of the wavelength channel; if the channel associated optical label power monitoring results of all channels are not consistent with the expectation, the optical fiber link may be damaged.
Fig. 3 is a schematic diagram of monitoring optical label power according to an embodiment of the present invention, and fig. 3 shows an optical label compensation effect of all wavelength channels after 5 iterations of the 5 th span. As can be seen from fig. 3, the power of the optical tag corrected by the method provided by the embodiment of the present invention is very close to the true value.
Based on any of the above embodiments, fig. 4 is a schematic structural diagram of an optical network monitoring apparatus provided in an embodiment of the present invention, as shown in fig. 4, the apparatus includes a measurement unit 410, an iterative correction unit 420, and a monitoring unit 430;
the measurement unit 410 is configured to determine an optical label power measurement value of each span of each service link in the optical network;
the iteration correction unit 420 is configured to calculate a current corrected tag value of each span of each service link based on the SRS power transfer mechanism, and the optical tag power measurement value and the last corrected tag value of each span of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link;
the monitoring unit 430 is configured to perform optical network monitoring based on the current corrected tag value of each span of each service link that meets the preset iteration condition.
The device provided by the embodiment of the invention corrects the optical label power measurement value of each span section of each service link in the optical network based on the SRS power transfer mechanism, and performs optical network monitoring based on the corrected label value, thereby effectively improving the accuracy and reliability of optical network monitoring. In addition, the optical label power measurement value can be obtained by only directly detecting the photoelectric detector with low bandwidth, so that the cost of optical network monitoring is effectively reduced.
Based on any of the above embodiments, the iterative modification unit 420 includes:
a correction quantity determining subunit, configured to calculate, for any span of any service link, based on an SRS power transfer mechanism and a last corrected tag value of each service link in the any span, a gain of an optical tag power of each remaining service link in the any span to the any service link, where the gain is used as a current power correction quantity of the any span of the any service link;
a power correction subunit, configured to determine a current corrected tag value of any span of the any service link based on the optical tag power measurement value and the current power correction of the any span of the any service link and a current power correction of each span before the any span.
Based on any of the above embodiments, the correction amount determining subunit is specifically configured to:
calculating the current power correction quantity delta P of any span of any service link based on the following formulaj，k，m：
Wherein j is the wavelength channel number corresponding to any service link, k is the current iteration number, m is the number of the cross-sections experienced by the service signal corresponding to any service link, and Pj，k，mThe number j of the wavelength channel, the iteration number k, the last corrected label value corresponding to the number m of the experienced segments, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffRespectively the effective length and the effective area of the optical fiber.
Based on any of the embodiments above, the power correction subunit is specifically configured to:
determining a current revised tag value for said any span of said any traffic link based on the following formula:
in the formula, Pj，mAnd Pj，k+1，mThe optical label power measured value and the current corrected label value of any span of any service link are respectively.
According to any of the above embodiments, the apparatus further comprises a chromatic dispersion correction unit; the chromatic dispersion correction unit is used for performing deviation correction on each optical label power measurement value affected by the chromatic dispersion effect.
Based on any one of the above embodiments, the chromatic dispersion correction unit includes:
a delay determining subunit, configured to calculate, based on the link configuration information and the tag frequency information of the optical network, a relative phase delay on each wavelength channel of each span;
the crosstalk determining subunit is configured to determine, based on the SRS crosstalk amount of each wavelength channel of each span, a contribution ratio of other wavelength channels in the optical tag power measurement value of each wavelength channel of each span;
a deviation determining subunit, configured to determine, based on the relative phase delay and the contribution ratio of any wavelength channel of any span, a measured value deviation of any wavelength channel of any span caused by chromatic dispersion;
and the deviation correction subunit is used for correcting the optical label power measurement value of any one wavelength channel of any span section based on the measurement value deviation of any one wavelength channel of any span section.
Based on any of the embodiments described above, the delay determining subunit is specifically configured to:
calculating the relative phase delay on any wavelength channel of any span section based on the following formula:
Δtm，j＝D·mL·jΔλ；
in the formula,. DELTA.tm，jIs the m < th > oneRelative phase delay of a jth wavelength channel of a span section, D is a dispersion coefficient, L is the optical fiber length of a single span section, and Delta lambda is the wavelength channel interval of an optical network;
the crosstalk determining subunit is specifically configured to:
calculating the remaining power P of any wavelength channel of any span section after SRS crosstalk based on the following formulam，j，restAnd crosstalk power P to other wavelength channels im，j，i：
In the formula, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffThe effective length and the effective area of the optical fiber are respectively; pj，mAn optical tag power measurement for an mth span jth wavelength channel;
the deviation determining subunit is specifically configured to:
calculating dispersion correction coefficient x of any wavelength channel of any span based on the following formulam，jA 1 is to Pj，m·xm，jAs the measured value deviation:
in the formula, 1i is a complex unit, ωjThe frequency of the optical label of the jth channel.
Based on any one of the above embodiments, the device further comprises an up-down correction unit; the uplink and downlink correction unit is used for correcting the last corrected label value of each span section of each service link based on a preset uplink and downlink correction rule;
the preset up-down correction rule is used for correcting the optical label power deviation of the self and other channels caused by the up-down of the service signal corresponding to the service link.
Based on any of the above embodiments, the add/drop correction unit is specifically configured to:
compensating the last corrected label value of the downlink span of any service link based on the compensation power value of any service link; the compensation power value is the power value of other wavelength channels transferred to the downlink wavelength channel on the previous span of the downlink span;
updating the difference between the last corrected label value of the uplink span of any service link and the residual power value of any service link to be the last corrected label value of the uplink span; and the residual power value is the power value of the wavelength channel transferred from the downlink wavelength channel to other wavelength channels on the previous span of the downlink span.
Based on any of the above embodiments, the preset iteration condition is that the current iteration number reaches the maximum span number of each service link.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device may include: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may call logical commands in memory 530 to perform the following method: determining an optical label power measurement value of each span section of each service link in an optical network; calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link; and monitoring the optical network based on the current corrected label value of each span section of each service link meeting the preset iteration condition.
In addition, the logic commands in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic commands are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of commands for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the method provided in the foregoing embodiments when executed by a processor, and the method includes: determining an optical label power measurement value of each span section of each service link in an optical network; calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link; the first corrected tag value of each span of each service link is calculated based on an SRS power transfer mechanism and an optical tag power measured value of each span of each service link; and monitoring the optical network based on the current corrected label value of each span section of each service link meeting the preset iteration condition.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. 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 can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes commands for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An optical network monitoring method, comprising:
determining an optical label power measurement value of each span section of each service link in an optical network;
based on an SRS power transfer mechanism and the optical label power measured value of each span of each service link, correcting the optical label power measured value of each span of each service link to obtain a first corrected label value of each span of each service link;
if the preset iteration condition is not met, performing a new round of iterative correction by taking the current corrected tag value of each span of each service link as the last corrected tag value, wherein the new round of iterative correction comprises the following steps: calculating the current corrected label value of each span section of each service link based on an SRS power transfer mechanism, and the optical label power measured value and the last corrected label value of each span section of each service link;
and monitoring the optical network based on the current corrected label value of each span section of each service link meeting the preset iteration condition.
2. The method according to claim 1, wherein the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, the optical tag power measurement value of each span of each service link, and a last modified tag value specifically comprises:
for any span of any service link, calculating the gain of each remaining service link in the any span on the optical tag power of the any service link based on an SRS power transfer mechanism and a last corrected tag value of each service link in the any span, and taking the gain as the current power correction quantity of the any span of the any service link;
and determining the current corrected tag value of any span of any service link based on the optical tag power measurement value and the current power correction quantity of any span of any service link and the current power correction quantity of each span before any span.
3. The method according to claim 2, wherein the calculating, for any span of any service link, a gain of an optical tag power of each remaining service link in the any span to the any service link based on an SRS power transfer mechanism and a last modified tag value of each service link in the any span as a current power modification amount of the any span of the any service link specifically comprises:
calculating the current power correction quantity delta P of any span of any service link based on the following formulaj，k，m：
Wherein j is the wavelength channel number corresponding to any service link, k is the current iteration number, m is the number of the cross-sections experienced by the service signal corresponding to any service link, and Pj，k，mThe number j of the wavelength channel, the iteration number k, the last corrected label value corresponding to the number m of the experienced segments, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffRespectively the effective length and the effective area of the optical fiber.
4. The method according to claim 3, wherein the determining a current modified tag value of the any span of the any traffic link based on the optical tag power measurement value and the current power modification amount of the any span of the any traffic link and the current power modification amount of each span before the any span specifically comprises:
determining a current revised tag value for said any span of said any traffic link based on the following formula:
in the formula, Pj，mAnd Pj，k+1，mThe optical label power measured value and the current corrected label value of any span of any service link are respectively.
5. The method according to claim 1, wherein the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, the optical tag power measurement value of each span of each service link and a last modified tag value further comprises:
and performing deviation correction on each optical label power measurement value affected by the chromatic dispersion effect.
6. The method according to claim 5, wherein the performing bias correction on the power measurement value of each optical tag affected by chromatic dispersion effect specifically comprises:
calculating relative phase delay on each wavelength channel of each span section based on the link configuration information and the label frequency information of the optical network;
determining the contribution proportion of other wavelength channels in the optical label power measurement value of each wavelength channel of each span section based on the SRS crosstalk amount of each wavelength channel of each span section;
determining the measured value deviation of any wavelength channel of any span caused by chromatic dispersion based on the relative phase delay and the contribution proportion of any wavelength channel of any span;
and correcting the optical label power measurement value of any wavelength channel of any span section based on the measurement value deviation of any wavelength channel of any span section.
7. The optical network monitoring method according to claim 6, wherein the calculating a relative phase delay on each wavelength channel of each span based on the link configuration information and the tag frequency information of the optical network specifically includes:
calculating the relative phase delay on any wavelength channel of any span section based on the following formula:
Δtm，j＝D·mL·jΔλ；
in the formula,. DELTA.tm，jThe relative phase delay of the jth wavelength channel of the mth span is adopted, D is a dispersion coefficient, L is the optical fiber length of a single span, and Delta lambda is the wavelength channel interval of the optical network;
the determining, based on the SRS crosstalk amount of each wavelength channel of each span, the contribution ratio of other wavelength channels in the optical tag power measurement value of each wavelength channel of each span specifically includes:
calculating the remaining power P of any wavelength channel of any span section after SRS crosstalk based on the following formulam，j，restAnd crosstalkPower P to other wavelength channels im，j，i：
In the formula, gR，pkIs SRS crosstalk linear coefficient, N is the number of wavelength channels, LeffAnd AeffThe effective length and the effective area of the optical fiber are respectively; pj，mAn optical tag power measurement for an mth span jth wavelength channel;
the determining, based on the relative phase delay and the contribution ratio of any one wavelength channel of any span, a measured value deviation of any one wavelength channel of any span caused by chromatic dispersion specifically includes:
calculating dispersion correction coefficient x of any wavelength channel of any span based on the following formulam，jA 1 is to Pj，m·xm，jAs the measured value deviation:
in the formula, 1i is a complex unit, ωjThe frequency of the optical label of the jth channel.
8. The method according to claim 1, wherein the calculating a current modified tag value of each span of each service link based on the SRS power transfer mechanism, the optical tag power measurement value of each span of each service link and a last modified tag value further comprises:
based on a preset up-down correction rule, correcting the last corrected label value of each span section of each service link;
the preset up-down correction rule is used for correcting the optical label power deviation of the self and other channels caused by the up-down of the service signal corresponding to the service link.
9. The optical network monitoring method according to claim 8, wherein the modifying the last modified tag value of each span of each service link based on a preset add/drop modification rule specifically comprises:
compensating the last corrected label value of the downlink span of any service link based on the compensation power value of any service link; the compensation power value is the power value of other wavelength channels transferred to the downlink wavelength channel on the previous span of the downlink span;
updating the difference between the last corrected label value of the uplink span of any service link and the residual power value of any service link to be the last corrected label value of the uplink span; and the residual power value is the power value of the wavelength channel transferred from the downlink wavelength channel to other wavelength channels on the previous span of the downlink span.
10. The method according to any of claims 1 to 9, wherein the preset iteration condition is that the current iteration number reaches the maximum span number of each service link.
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| CN112929093B (en) * | 2021-02-25 | 2023-03-31 | 索尔思光电（成都）有限公司 | OAM signal top-adjusting circuit |
| CN114221700B (en) * | 2021-12-22 | 2023-06-13 | 阿里巴巴（中国）有限公司 | Method and device for calculating configuration of optical transmission network and optical transmission network system |
| CN114726436B (en) * | 2022-03-18 | 2024-03-22 | 北京邮电大学 | Wavelength channel monitoring method and device for wavelength division multiplexing system |
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