CN112217561B - C + L waveband optical power automatic equalization method and system - Google Patents
C + L waveband optical power automatic equalization method and system Download PDFInfo
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- CN112217561B CN112217561B CN201910627034.6A CN201910627034A CN112217561B CN 112217561 B CN112217561 B CN 112217561B CN 201910627034 A CN201910627034 A CN 201910627034A CN 112217561 B CN112217561 B CN 112217561B
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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
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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
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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
- H04Q2011/0079—Operation or maintenance 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
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
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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 method and a system for automatically balancing optical power of a C + L waveband, and relates to the field of optical power setting. The method comprises the following steps: collecting the actual output light power of each channel, sequentially calculating the difference value between the actual output light power of each channel and the preset expected output light power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output light power of the channel by adjusting the fiber-entering light power of the corresponding channel until the difference value between the actual output light power and the expected output light power of all the channels is below the threshold value. The invention can realize the balance of the optical power of each wavelength in the C + L wave band by automatically adjusting the optical power, thereby ensuring the transmission performance of the system.
Description
Technical Field
The invention relates to the field of optical power setting, in particular to a method and a system for automatically balancing optical power of a C + L waveband.
Background
The existing DWDM (Dense Wavelength Division Multiplexing) system basically uses 96 waves in the C-band (calculated at 50 GHz), and when the DWDM system is extended to 192 waves in the C + L-band (calculated at 50 GHz), because the Wavelength of the optical signal in the C-band is shorter and the Wavelength of the optical signal in the L-band is longer, when all the optical signals in the C-band and the L-band are mixed and transmitted in one optical fiber, a stronger raman effect, that is, the optical power of the optical signal in the short Wavelength (C-band), is transferred to the optical power of the optical signal in the long Wavelength (L-band), that is, the energy of the short Wavelength signal in the C-band is lost, and the energy of the long Wavelength signal in the L-band is increased; at this time, if equalization pre-emphasis is not performed at the transmitting end, the OSNR (Optical Signal Noise Ratio) at the end of the partial wavelength Optical Signal at the receiving end is poor, and thus the overall transmission performance is reduced.
Energy transfer is not a simple linear relation, and at present, partial scholars analyze by establishing a mathematical model, but the energy transfer has different condition limits, and the influence relation among the partial scholars cannot obtain a mathematical analytic solution. Through different research and analysis, the final conclusion is that the Raman effect is strongly related to the length of the optical fiber, the type of the optical fiber, the single-wave fiber-entering optical power of the optical signal and the number of wave channels.
As can be seen from FIG. 1, the influence of the Raman effect reaches the maximum at the positions with the channel spacing of 70-100 nm, and the smaller the channel spacing, the less obvious the Raman effect is. Thus over the entire C-band (< 40nm interval), the linear function adjustment can be approximated because the effect due to raman effect is relatively small. However, in the whole C + L waveband (more than 80nm interval), because the influence of the Raman effect on part of the waveband is very obvious, the adjustment cannot be adjusted by using an approximate linear function, and only an approximate solution can be obtained by other modes.
Currently, the degradation of the tail end OSNR caused by the optical power loss of the C-band due to the raman effect in the C + L transmission process can only be alleviated by manually adjusting the single-wave fiber-in power and the slope of the C-band and the L-band, respectively. However, when adjusting the optical power of a certain channel, the optical power of other wavelengths longer than this channel is affected, for example: the power change of the 1 st wavelength light will affect the following 2 nd to 192 th wavelengths, but the influence coefficients are different; by analogy, the power change of the 2 nd wavelength light affects the following 3 rd to 192 th wavelengths, but the influence coefficients are different, especially the wavelength is larger than the wavelength of the light channel of 70 nm to 100 nm. If the problem cannot be solved, the OSNR of a part of channels is poor, and the maximum transmission performance of the whole system is affected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention solves the technical problems that: how to realize the optical power balance of each wavelength in the C + L waveband by a mode of automatically adjusting the optical power, thereby ensuring the transmission performance of the system.
In order to achieve the above purpose, the method for automatically equalizing the optical power of the C + L waveband provided by the invention comprises the following steps: collecting the actual output light power of each channel, sequentially calculating the difference value between the actual output light power of each channel and the preset expected output light power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output light power of the channel by adjusting the fiber-entering light power of the corresponding channel until the difference value between the actual output light power and the expected output light power of all the channels is below the threshold value.
On the basis of the above technical solution, the method for setting the desired output optical power includes: establishing an experience database in advance, wherein the experience database comprises different system configuration parameters and expected output optical power of each associated channel; each set of system configuration parameters comprises optical fiber length, optical fiber type, channel number and wavelength value;
the method for selecting the desired output optical power comprises the following steps: a desired output optical power for each wavelength associated with a corresponding system configuration parameter at the time of actual use is selected.
On the basis of the technical scheme, each set of system configuration parameters in the experience database also need to be associated with the fiber-entering optical power of each channel; the method also comprises the following steps before the actual output optical power of each channel is collected: and detecting actually used system configuration parameters, and acquiring and setting the fiber-in optical power of each channel associated with the corresponding system configuration parameters in an experience database.
On the basis of the above technical solution, the specific implementation method that the difference between the actual output optical power of all the channels and the expected output optical power is below the threshold value includes: defining all channels from short to long as lambda 1-lambda m in sequence, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the lambda 1-lambda m, stopping subsequent calculation when the calculated channel lambda n with the difference value larger than the preset threshold value is calculated, and adjusting the fiber-entering optical power of the lambda n; then, according to the sequence of lambdan + 1-lambdam, calculating the difference value between the actual output optical power of each channel and the preset expected output optical power in sequence, and adjusting the fiber-entering optical power of the channel with the difference value larger than the threshold value until lambdam; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then subsequent wavelength calculation and adjustment are performed.
On the basis of the above technical solution, each set of system configuration parameters in the experience database further needs to associate a weight of each channel, where the weight is increased fiber-in optical power/increased output optical power; the method for adjusting the fiber-entering optical power of lambdan comprises the following steps: and calculating the attenuation adjustment value of the lambda n by the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of lambdan is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of lambdan.
The invention provides a C + L waveband optical power automatic balancing system, which comprises a receiving end comparator;
the receiving end comparator is used for: collecting the actual output optical power of each channel, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output optical power of the channel by adjusting the fiber-entering optical power of the channel corresponding to the sending end until the difference value between the actual output optical power and the expected output optical power of all the channels is below the threshold value.
On the basis of the technical scheme, the system also comprises an experience database establishing module and a presetting module;
the experience database establishing module is used for: establishing an experience database, wherein the experience database comprises different system configuration parameters and the expected output optical power of each associated wave channel; each set of system configuration parameters comprises optical fiber length, optical fiber type, channel number and wavelength value;
the preset module is used for: the desired output optical power for each wavelength in the empirical database associated with the corresponding system configuration parameter at the time of actual use is selected.
On the basis of the technical scheme, the experience database establishing module is further configured to: associating the fiber-entering optical power of each channel for each set of system configuration parameters; the preset module is further configured to: and detecting the actually used system configuration parameters, and acquiring and setting the fiber-in optical power of each channel associated with the corresponding system configuration parameters in an experience database.
On the basis of the above technical solution, the specific process of the receiving end comparator for realizing that the difference between the actual output optical power and the expected output optical power of all channels is below the threshold value includes: defining all channels from short to long as lambda 1-lambda m in sequence, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the lambda 1-lambda m, stopping subsequent calculation when the calculated channel lambda n with the difference value larger than the preset threshold value is calculated, and adjusting the fiber-entering optical power of the lambda n; then, according to the sequence of lambdan + 1-lambdam, the difference value between the actual output optical power of each channel and the preset expected output optical power is calculated in sequence, and the fiber-entering optical power of the channel with the difference value larger than the threshold value is adjusted until lambdam; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then subsequent wavelength calculation and adjustment are performed.
On the basis of the technical scheme, the experience database building module is further configured to: associating a weight of each channel for each set of system configuration parameters, the weight being an increased fiber-in power/an increased output optical power;
the adjustment process of the fiber-entering optical power of the lambdan comprises the following steps: and calculating the attenuation adjustment value of lambdan according to the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of lambdan is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of lambdan.
Compared with the prior art, the invention has the advantages that:
the invention can use the equalization pre-emphasis technology (namely presetting the expected output optical power) in the wavelength division device of the C + L wave band, and can rapidly adjust the optical power of each wave channel during the operation, thereby realizing the optical power equalization of each wave channel, further relieving the influence of the Raman effect on the C + L wavelength division system, and ensuring that all channel services work in the optimal range.
Meanwhile, the invention can directly and automatically adjust under the condition that the optical power of each channel changes in operation if the optical power exceeds the threshold value, does not need human intervention and is very convenient to use.
Drawings
FIG. 1 is a schematic diagram of Raman effect of a wavelength division system in the background art of the present invention;
FIG. 2 is a schematic structural diagram of a C + L band wavelength division device according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a comparison between an actual output optical power and a desired output optical power according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an input/output curve of optical power equalization with added channels in an embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for automatically equalizing optical power in C + L band according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The method for automatically balancing the optical power of the C + L waveband in the embodiment of the invention comprises the following steps:
firstly, a set of C + L waveband wavelength division device needs to be established, and the establishment mode of the device is a conventional means in the field; referring to fig. 2, the transmitting end of the communication apparatus in this embodiment includes:
a VMU (channel attenuation adjustable multiplexer, 48 channels in this embodiment, CE is C-band even wave, CO is C-band odd wave, LE is L-band even wave, and LO is L-band odd wave) connected to the service board (100G in this embodiment); the system is used for combining the light waves transmitted by the service board card;
ITL50_ C and ITL50_ L (comb filters for C-band and L-band) for filtering the light waves transmitted by the VMU;
OA _ C and OA _ L (amplifiers for C band and L band) for amplifying the light waves transmitted by ITL _ C and ITL50_ L, respectively;
50:50 coupler, its wave splitting port connects OA _ C and OA _ L separately, the wave combining port connects with a sending end comparator;
OSCAD _ CL (1510, C and L band combiner) for combining optical waves transmitted by OA _ C and OA _ L;
EOSC + OTDR (monitoring optical channel);
the receiving end of the device is similar to the transmitting end, and the difference is that:
OSCAD _ CL is 1510, C and L wave band wave splitters;
the amplifier has 2 stages (in practical application, there may be multiple stages, PA represents one stage, and OA represents 2 stages);
an ODU48 (48-channel optical demultiplexer) corresponding to the VMU.
On this basis, a receiving end comparator (the input end of which is connected with a 50:50 coupler) is arranged at the receiving end to collect the actual output optical power of each channel, the difference between the actual output optical power of each channel and the preset expected output optical power (each channel has its own expected output optical power) is sequentially calculated according to the sequence of the wavelengths from small to large, and if the difference is larger than the preset threshold value, the actual output optical power of the channel is changed by adjusting the fiber-in optical power of the channel corresponding to the transmitting end (see fig. 2, whether the fiber-in optical power is successfully adjusted can be monitored by arranging an originating end comparator with an input end connected with the 50:50 coupler at the transmitting end) until the difference between the actual output optical power and the expected output optical power of all channels is below the threshold value.
Therefore, the balanced pre-emphasis technology (namely, the expected output optical power is preset) can be used in the C + L wave band wavelength division device, and the optical power of each channel can be rapidly adjusted during start-up, so that the optical power balance of each channel is realized, the influence of the Raman effect on the C + L wave division system is further relieved, and the service of all channels is ensured to work in the optimal range.
Meanwhile, the invention can directly and automatically adjust the optical power of each channel under the condition of changing the optical power, if the optical power exceeds the threshold value, the artificial intervention is not needed, and the use is very convenient.
Preferably, the method for setting the desired output optical power includes: establishing an experience database in advance, wherein the experience database comprises different system configuration parameters and expected output optical power of each associated channel; in the background art, it has been mentioned that the raman effect is strongly correlated with the fiber length, the fiber type, the single-wave fiber-in power of the optical signal, and the number of channels, so that one set of system configuration parameters of the empirical database includes the fiber length, the fiber type, the number of channels, and the wavelength value.
On this basis, the method for selecting the desired output optical power comprises the following steps: the desired output optical power for each wavelength in the empirical database associated with the corresponding (same or close) system configuration parameter at actual use is selected.
Preferably, in order to accelerate the speed of adjusting the optical power, the setting of the optical power of each channel needs to be performed at the time of opening an office, and for this reason, each set of system configuration parameters in the experience database needs to be associated with the optical power of each channel.
On this basis, the initial setting step of the fiber-in optical power in the method is as follows: the actually used system configuration parameters (the length, the type and the number of channels) are detected, and the fiber-incoming optical power of each channel associated with the corresponding (same or most performed) system configuration parameters is obtained and set in an empirical database (the attenuation of each channel in the VMU and the input optical power of the corresponding amplifier are set according to the fiber-incoming optical power).
The specific detection method of the system configuration parameters actually used in this embodiment includes: since the present embodiment is 50GHz, the number of channels is 192 waves, and therefore, only the length of the optical fiber and the type of the optical fiber need to be detected.
For the length of the optical fiber, the length can be measured in an OTDR or 1588 time synchronization mode; the OTDR is realized by hardware, and the result error obtained by using an OTDR mode measuring method is basically about 10 m; 1588 the time synchronization method is based on time delay data between two stations and 5us/km coefficient to get the length of optical fiber with error on the order of 10 m.
For the type of optical fiber, the main influence is dispersion and the effective sectional area of the optical fiber, and for a coherent optical transmission system with the speed of 100G and above, the dispersion is not the main influence factor; the effective sectional area of the optical fiber can influence the optical power of single-wave fiber, the larger the effective sectional area is, the larger the optical power of the single-wave fiber is, the better the OSNR at the tail end is, but the more obvious the nonlinear effect and the Raman effect are; therefore, the type of the optical fiber can be determined by reporting the dispersion value by a 100G coherent optical module.
Preferably, the specific implementation method that the difference between the actual output optical power and the expected output optical power of all the channels is below a threshold value includes: defining all channels from short to long as lambda 1-lambda m (m is 192 in this embodiment), sequentially calculating the difference between the actual output optical power of each channel and the preset expected output optical power according to the sequence of lambda 1-lambda m (see fig. 3, the comparison calculation can be calculated through a chart during the calculation, which is clear), and stopping the subsequent calculation when calculating the channel lambda n of which the difference is greater than the preset threshold value, and adjusting the fiber-entering optical power of lambda n; then, according to the sequence of lambada n + 1-lambada m (because lambada n is already adjusted, calculation is not needed), calculating the difference value between the actual output optical power of each channel and the preset expected output optical power in sequence, and adjusting the fiber-entering optical power of the channel with the difference value larger than the threshold value until lambada m; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then subsequent wavelength calculation and adjustment are performed.
Finally, in order to further ensure the optical power balance of each channel, the above process may be repeated and periodically performed.
Preferably, the method for adjusting the fiber-incoming optical power of λ n includes: and calculating the attenuation adjustment value of lambdan according to the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of lambdan is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of lambdan.
In this embodiment, the weight of each channel is preset and associated with a system configuration parameter corresponding to the experience database, and the method for setting the weight includes:
the fiber-entering optical power of each channel is adjusted in sequence from short wave to long wave in advance, the optical power change conditions of all the wavelengths are fed back at the output end, so that the influence factors among different wavelengths are obtained, the influence of the fiber-entering optical power change of each channel on the output optical power of the channel can be obtained, and the weight is calculated, wherein the specific calculation formula is as follows: weight-increased in-fiber power/increased output optical power. For example, as shown in fig. 4, when the input fiber power of λ 1 is increased by 1db and the output light power of λ 1 is increased by 0.2db, the weight of λ 1 is 1/0.2 is 5.
The method is described in detail below by means of a complete set of procedures.
Referring to fig. 5, the method for automatically equalizing optical power of C + L band in the embodiment of the present invention includes the following specific steps:
s1: the actually used system configuration parameters (the length, the type and the number of channels of the optical fiber) are detected, the fiber-incoming optical power of each channel associated with the corresponding system configuration parameters is obtained from the experience database and is set, and the process goes to S2.
S2: the actual input optical power of each channel is scanned by the receiver comparator, and the process goes to S3.
S3: and sequentially calculating the difference value between the actual output light power of each channel and the preset expected output light power (the difference value is 0 representing no difference value) according to the sequence from the short wave to the long wave, stopping subsequent calculation when the channel lambdan with the difference value larger than the preset threshold value is calculated, and turning to S4, and turning to S5 when the difference value between the actual output light power of all the channels and the preset expected output light power is within the threshold value.
S4: adjusting the fiber-entering optical power of lambdan: if the actual output optical power of the lambdan is larger than the expected output optical power, adding the attenuation adjusting value to the actual attenuation value of the lambdan; if the actual output optical power of λ n is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of λ n, and the process goes to S2.
S5: and keeping the current configuration unchanged, and ending.
The automatic C + L waveband light power balancing system in the embodiment of the invention comprises an experience database establishing module, a presetting module and a receiving end comparator.
The experience database establishing module is used for: establishing an experience database, wherein the experience database comprises different system configuration parameters and fiber-in optical power, expected output optical power and weight of each channel related to the different system configuration parameters; each set of system configuration parameters comprises optical fiber length, optical fiber type, channel number and wavelength value; the setting flow of the weight comprises the following steps: the weight is the added in-fiber optical power/added out-fiber optical power.
The preset module is used for: detecting actually used system configuration parameters, and acquiring and setting fiber-entering optical power of each channel associated with the corresponding system configuration parameters in an experience database; the desired output optical power for each wavelength in the empirical database associated with the corresponding system configuration parameter at the time of actual use is selected.
The receiving end comparator is used for: collecting the actual output optical power of each channel, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output optical power of the channel by adjusting the fiber-entering optical power of the channel corresponding to a sending end until the difference value between the actual output optical power and the expected output optical power of all the channels is below the threshold value; the specific process comprises the following steps: defining all channels from short to long as lambda 1-lambda m in sequence, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the lambda 1-lambda m, stopping subsequent calculation when the calculated channel lambda n with the difference value larger than the preset threshold value is calculated, and adjusting the fiber-entering optical power of the lambda n; then, according to the sequence of lambdan + 1-lambdam, calculating the difference value between the actual output optical power of each channel and the preset expected output optical power in sequence, and adjusting the fiber-entering optical power of the channel with the difference value larger than the threshold value until lambdam; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then the subsequent wavelength calculation and adjustment are performed
The adjustment flow of the fiber-entering optical power of lambdan comprises the following steps: and calculating the attenuation adjustment value of lambdan according to the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of the lambdan is less than the expected output optical power, subtracting the attenuation adjusting value from the actual attenuation value of the lambdan;
it should be noted that: in the system provided in the embodiment of the present invention, when performing inter-module communication, only the division of each functional module is illustrated, and in practical applications, the above function distribution may be completed by different functional modules as needed, that is, the internal structure of the system is divided into different functional modules to complete all or part of the above described functions.
Further, the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. A method for automatically equalizing optical power of C + L bands is characterized by comprising the following steps: collecting the actual output light power of each channel, sequentially calculating the difference value between the actual output light power of each channel and the preset expected output light power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output light power of the channel by adjusting the fiber-entering light power of the corresponding channel until the difference value between the actual output light power and the expected output light power of all the channels is below the threshold value;
the setting method of the desired output optical power comprises the following steps: establishing an experience database in advance, wherein the experience database comprises different system configuration parameters and expected output optical power of each associated channel; each set of system configuration parameters comprises optical fiber length, optical fiber type, channel number and wavelength value;
the method for selecting the desired output optical power comprises the following steps: selecting a desired output optical power for each wavelength associated with a corresponding system configuration parameter at actual use;
the specific implementation method that the difference between the actual output optical power and the expected output optical power of all the channels is below the threshold value comprises the following steps: defining all channels from short to long as lambda 1-lambda m in sequence, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the lambda 1-lambda m, stopping subsequent calculation when the calculated channel lambda n with the difference value larger than the preset threshold value is calculated, and adjusting the fiber-entering optical power of the lambda n; then, according to the sequence of lambdan + 1-lambdam, calculating the difference value between the actual output optical power of each channel and the preset expected output optical power in sequence, and adjusting the fiber-entering optical power of the channel with the difference value larger than the threshold value until lambdam; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then subsequent wavelength calculation and adjustment are performed.
2. The method for automatically equalizing optical power in C + L band according to claim 1, wherein each set of system configuration parameters in the experience database further needs to be associated with the fiber-in optical power of each channel; the method also comprises the following steps before the actual output optical power of each channel is collected: and detecting the actually used system configuration parameters, and acquiring and setting the fiber-in optical power of each channel associated with the corresponding system configuration parameters in an experience database.
3. The method for automatically equalizing optical power in C + L band according to claim 1, wherein: each set of system configuration parameters in the experience database also needs to be associated with a weight of each channel, where the weight is an increased fiber-in optical power/an increased output optical power; the method for adjusting the fiber-entering optical power of lambdan comprises the following steps: and calculating the attenuation adjustment value of lambdan according to the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of lambdan is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of lambdan.
4. The utility model provides a C + L wave band's automatic balanced system of luminous power which characterized in that: the system comprises a receiving end comparator;
the receiving end comparator is used for: collecting the actual output optical power of each channel, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the wavelengths from small to large, and if the difference value is larger than a preset threshold value, changing the actual output optical power of the channel by adjusting the fiber-entering optical power of the channel corresponding to a sending end until the difference value between the actual output optical power and the expected output optical power of all the channels is below the threshold value;
the system also comprises an experience database establishing module and a presetting module;
the experience database establishing module is used for: establishing an experience database, wherein the experience database comprises different system configuration parameters and the expected output optical power of each associated wave channel; each set of system configuration parameters comprises optical fiber length, optical fiber type, channel number and wavelength value;
the preset module is used for: selecting a desired output optical power for each wavelength in an empirical database associated with a corresponding system configuration parameter at actual use;
the specific process of the receiving end comparator for realizing that the difference value between the actual output optical power and the expected output optical power of all the channels is below the threshold value comprises the following steps: defining all channels from short to long as lambda 1-lambda m in sequence, sequentially calculating the difference value between the actual output optical power of each channel and the preset expected output optical power according to the sequence of the lambda 1-lambda m, stopping subsequent calculation when the calculated channel lambda n with the difference value larger than the preset threshold value is calculated, and adjusting the fiber-entering optical power of the lambda n; then, according to the sequence of lambdan + 1-lambdam, calculating the difference value between the actual output optical power of each channel and the preset expected output optical power in sequence, and adjusting the fiber-entering optical power of the channel with the difference value larger than the threshold value until lambdam; after each wavelength is adjusted, the actual output optical power of each channel needs to be collected again, and then subsequent wavelength calculation and adjustment are performed.
5. The system for automatically equalizing optical power in the C + L band according to claim 4, wherein the experience database creation module is further configured to: associating the fiber-entering optical power of each channel for each set of system configuration parameters; the preset module is further configured to: and detecting the actually used system configuration parameters, and acquiring and setting the fiber-in optical power of each channel associated with the corresponding system configuration parameters in an experience database.
6. The system for automatically equalizing optical power in the C + L band according to claim 4, wherein: the experience database building module is further configured to: associating a weight of each channel for each set of system configuration parameters, wherein the weight is increased fiber-in optical power/increased output optical power;
the adjustment process of the fiber-entering optical power of the lambdan comprises the following steps: and calculating the attenuation adjustment value of lambdan according to the following formula: the attenuation adjusting value is the weight of the difference multiplied by lambdan between the actual output optical power of lambdan and the expected output optical power, and if the actual output optical power of lambdan is larger than the expected output optical power, the actual attenuation value of lambdan is added with the attenuation adjusting value; if the actual output optical power of lambdan is less than the desired output optical power, the attenuation adjustment value is subtracted from the actual attenuation value of lambdan.
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