CN112310790A - Control method and device of optical fiber amplifier, electronic equipment and storage medium - Google Patents
Control method and device of optical fiber amplifier, electronic equipment and storage medium Download PDFInfo
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- CN112310790A CN112310790A CN202011096337.9A CN202011096337A CN112310790A CN 112310790 A CN112310790 A CN 112310790A CN 202011096337 A CN202011096337 A CN 202011096337A CN 112310790 A CN112310790 A CN 112310790A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
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Abstract
The invention provides a control method and a control device of an optical fiber amplifier, electronic equipment and a storage medium; the method comprises the following steps: determining a pumping current ratio according to a noise parameter of the optical fiber amplifier, wherein the pumping current ratio is as follows: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier; determining a desired output current value of the first pump based on the input power and the desired gain of the fiber amplifier; determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump; driving the first pump according to a desired output current value of the first pump; driving the second pump according to a desired output current value of the second pump.
Description
Technical Field
The present invention relates to the field of optical fiber amplifier technologies, and in particular, to a method and an apparatus for controlling an optical fiber amplifier, an electronic device, and a storage medium.
Background
Erbium-doped fiber amplifiers are the most widely used amplifiers in the field of fiber-optic communication, and especially in dense wavelength division multiplexing optical communication systems, with the current 5G commercialization gradually spreading, the bandwidth of fiber-optic communication is increasing, the wavelength range and the wavelength number in the wavelength division system are also increasing, and the C + + band and the C + L band are gradually expanded from the conventional C band. In such a background environment, the wavelength range of the erbium-doped fiber amplifier needs to be enlarged, and the corresponding optical path structure becomes more and more complex. The stage-by-stage pump optical path structure has become increasingly unable to meet the increasing demand, and therefore, erbium-doped fiber amplifiers with one stage of double pumps or multiple pumps cascaded are developed, and the control complexity of the pumps is increased.
The control method of the erbium-doped fiber amplifier at present mainly comprises two control schemes of digitization and simulation, wherein the simulation scheme builds a control system by an analog circuit, the cost is low, but the control precision and the function are insufficient compared with the digitization scheme. The digitization scheme usually uses an FPGA (Field Programmable Gate Array) chip to implement real-time gain locking, and the current digitization scheme controls a multi-pump cascaded erbium-doped fiber amplifier, usually controls each pump independently, and each pump has its own feedforward algorithm control and feedback algorithm control. The scheme has the advantages that the feedforward control and the feedback control of each pump can be flexibly configured; the method has the disadvantages that with the increase of the number of pumps, logic resources consumed in FPGA design can be multiplied, feedforward calibration becomes more and more complex, fixed pump ratio distribution is not available, automatic script calibration is difficult to realize, manual feedforward calibration needs to be carried out according to experience, uncertainty is increased, different module errors of calibration accuracy are large, feedforward calibration time is long in batch production, in addition, a Differential component of a feedback control PID (proportional-Integral-Differential) controller cannot be added to each pump, otherwise, when a target gain is reached, the distribution of pump current has the possibility of various combinations, noise indexes can be influenced, the Differential component of feedback control is reduced, and transient indexes can be correspondingly reduced.
Disclosure of Invention
The embodiment of the invention provides a control method and device of an optical fiber amplifier, electronic equipment and a storage medium.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a control method of an optical fiber amplifier, which comprises the following steps:
determining a pumping current ratio according to a noise parameter of the optical fiber amplifier, wherein the pumping current ratio is as follows: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
determining a desired output current value of the first pump based on the input power and the desired gain of the fiber amplifier;
determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
driving the first pump according to a desired output current value of the first pump;
driving the second pump according to a desired output current value of the second pump.
In the foregoing solution, the determining a desired output current value of the first pump according to the input power and the desired gain of the optical fiber amplifier includes:
and determining the expected output current value of the first pump by adopting a feedforward control algorithm according to the input power and the expected gain of the optical fiber amplifier.
In the foregoing solution, determining the desired output current of the first pump by using a feed-forward control algorithm according to the input power and the desired gain includes:
recording feedback control values corresponding to different input powers under different expected gains according to a feedback control algorithm; wherein the feedback control value is: an error value between a desired output current value of the first pump and an actual output current value of the first pump;
and determining the expected output current value of the first pump according to the expected gain and the input power and a feedforward control algorithm and the feedback control value.
In the foregoing solution, before the determining the expected output current value of the first pump by using the feedforward control algorithm, the method further includes:
under different expected gains, determining the actual output current value of the first pump under different input powers by adopting a feedback control algorithm;
performing linear fitting according to the corresponding relation between the input power and the actual output current value to obtain a fitting curve;
and determining a feedforward control parameter of the first pump according to the fitted curve, wherein the feedforward control parameter is used for the feedforward control algorithm to determine a desired output current value of the first pump.
In the foregoing solution, after determining the output current value of the first pump, the method further includes:
determining an upper current limit and a lower current limit of the first pump according to the current limiting parameters of the first pump and the second pump and the pump current ratio;
determining a feedback control maximum value of the first pump according to the current upper limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
determining a feedback control minimum value of the first pump according to the lower current limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
when performing feedback control, a feedback control value input to the feedforward control algorithm is selected from between the feedback control maximum value and the feedback control value.
In the above scheme, the method further comprises:
determining whether an abnormal current value outside a corresponding current rated range exists in the actual output current values; if the abnormal current value exists, determining a limited output current value according to the abnormal current value and the corresponding current rated range;
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value.
In the foregoing aspect, the adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value includes:
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value and the control error value of the pump.
In the foregoing solution, the driving the first pump according to the desired output current value of the first pump includes: adjusting the driving current for driving the first pump in a stepping mode according to the expected output current value of the first pump;
the driving the second pump according to a desired output current value of the second pump includes: and adjusting the driving current for driving the second pump in a stepping mode according to the expected output current value of the second pump.
An embodiment of the present invention further provides a control apparatus for an optical fiber amplifier, including:
a ratio control module, configured to determine a pumping current ratio according to a noise parameter of the optical fiber amplifier, where the pumping current ratio is: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
a determining module for determining a desired output current value of the first pump based on an input power and a desired gain of the fiber amplifier; determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
and the driving module is used for driving the first pump according to the expected output current value of the first pump and driving the second pump according to the expected output current value of the second pump.
In the foregoing solution, the determining module is specifically configured to determine the expected output current value of the first pump by using a feed-forward control algorithm according to the input power and the expected gain of the optical fiber amplifier.
In the above solution, the apparatus further includes a calibration module, configured to:
under different expected gains, determining the actual output current value of the first pump under different input powers by adopting a feedback control algorithm;
performing linear fitting according to the corresponding relation between the input power and the actual output current value to obtain a fitting curve;
and determining a feedforward control parameter of the first pump according to the fitted curve, wherein the feedforward control parameter is used for the feedforward control algorithm to determine a desired output current value of the first pump.
In the foregoing solution, the determining module is further specifically configured to:
recording feedback control values corresponding to different input powers under different expected gains according to a feedback control algorithm; wherein the feedback control value is: an error value between a desired output current value of the first pump and an actual output current value of the first pump;
and determining the expected output current value of the first pump according to the expected gain and the input power and a feedforward control algorithm and the feedback control value.
In the above scheme, the apparatus further comprises:
a protection module, configured to determine an upper current limit and a lower current limit of the first pump according to a current limiting parameter of the first pump and the second pump and the pump current ratio;
determining a feedback control maximum value of the first pump according to the current upper limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
determining a feedback control minimum value of the first pump according to the lower current limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
when performing feedback control, a feedback control value input to the feedforward control algorithm is selected from between the feedback control maximum value and the feedback control value.
In the above scheme, the protection module is further configured to:
determining whether an abnormal current value outside a corresponding current rated range exists in the actual output current values; if the abnormal current value exists, determining a limited output current value according to the abnormal current value and the corresponding current rated range;
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value.
In the above scheme, the protection module is specifically configured to:
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value and the control error value of the pump.
In the foregoing solution, the driving module is specifically configured to: adjusting the driving current for driving the first pump in a stepping mode according to the expected output current value of the first pump; and adjusting the driving current for driving the second pump in a stepping mode according to the expected output current value of the second pump.
An embodiment of the present invention further provides an electronic device, including:
a memory for storing executable instructions;
and the processor is used for realizing the control method of the optical fiber amplifier provided by the embodiment of the invention when executing the executable instructions stored in the memory.
The embodiment of the invention also provides a computer-readable storage medium, which stores executable instructions, and when the executable instructions are executed by a processor, the control method of the optical fiber amplifier provided by the embodiment of the invention is realized.
The embodiment of the invention determines the ratio of the pumping current according to the noise parameter, determines the expected output current value of the second pump in the optical fiber amplifier according to the ratio of the pumping current and the expected output current value of the first pump, realizes that the driving current of the second pump can be calculated according to the ratio of the pumping current without independently controlling the second pump, and the control of the optical fiber amplifier can be realized only by controlling the first pump by using the control method of the ratio control of the pumping current instead of the current method of independently controlling each pump, normalizes the control method of multiple pumps into the control method of single pump, reduces the resources required by the control design of the pumping in the optical fiber amplifier while ensuring that the noise of the optical fiber amplifier is controlled in the required range, the cost of chip type selection is reduced, the difficulty of design is reduced, and the research and development efficiency is improved.
Drawings
Fig. 1 is a schematic flow chart of a control method of an optical fiber amplifier according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a control method of a one-stage multi-pump erbium-doped fiber amplifier according to an embodiment of the present invention;
FIG. 3 is a logic diagram of a control method for a novel multi-pump cascaded erbium-doped fiber amplifier according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a control method for a novel multi-pump cascaded erbium-doped fiber amplifier according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of an optical fiber amplifier according to an embodiment of the present invention;
fig. 6 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 present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
It will be appreciated by those skilled in the art that while the following description refers to numerous technical details of embodiments of the present invention, this is by way of example only, and not by way of limitation, to illustrate the principles of the invention. The present invention can be applied to places other than the technical details exemplified below as long as they do not depart from the principle and spirit of the present invention.
In addition, in order to avoid limiting the description of the present specification to a great extent, in the description of the present specification, it is possible to omit, simplify, and modify some technical details that may be obtained in the prior art, as would be understood by those skilled in the art, and this does not affect the sufficiency of disclosure of the present specification.
In the following description, reference is made to "some embodiments" and "an embodiment" which describe a subset of all possible embodiments, but it is understood that "some embodiments" and "an embodiment" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
In the following description, references to the terms "first \ second \ third" are only to distinguish similar objects and do not denote a particular order, but rather the terms "first \ second \ third" are used to interchange specific orders or sequences, where appropriate, to enable embodiments of the invention described herein to be practiced in other than the order shown or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to be limiting of the invention.
The following describes a method for controlling an optical fiber amplifier according to an embodiment of the present invention. Referring to fig. 1, fig. 1 is a schematic flow chart of a control method of an optical fiber amplifier according to an embodiment of the present invention; the control method of the optical fiber amplifier provided by the embodiment of the invention comprises the following steps:
step 101: determining a pumping current ratio according to a noise parameter of the optical fiber amplifier, wherein the pumping current ratio is as follows: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
step 102: determining a desired output current value of the first pump based on the input power and the desired gain of the fiber amplifier;
step 103: determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
step 104: driving the first pump according to a desired output current value of the first pump;
driving the second pump according to a desired output current value of the second pump.
In a disclosed embodiment of the invention, the fiber amplifier comprises at least two pumps. The first pump may be any pump in the optical fiber amplifier, the second pump may be a pump other than the first pump in the optical fiber amplifier, and the second pump may be one or more pumps. The desired gain can be set according to user requirements. The noise parameter includes, but is not limited to, a noise figure.
In one embodiment, the first pump may be the first pump in a fiber amplifier.
In one embodiment, step 101 comprises:
the pump driving current in the optical fiber amplifier is distributed according to a certain ratio according to the noise figure and/or the noise margin of the optical fiber amplifier, thereby controlling the noise of the optical fiber amplifier within the range required by the optical transmission system. The noise index is the ratio of the signal-to-noise ratio of the input end to the signal-to-noise ratio of the output end. The noise margin represents the ability of the fiber amplifier to tolerate noise.
In another embodiment, a pump connected to a first section of erbium-doped fiber in the fiber amplifier is used as a first pump, and when the pump current ratio is adjusted, the proportion of the drive current value of the first pump is increased as much as possible to optimize the noise figure. For the optical path structure of the multi-pump cascade, the output of the first pump in the optical fiber amplifier is the input of the second pump, and through research and analysis, the noise index of the optical fiber amplifier is degraded along with the reduction of the input optical power, so that the driving current ratio of the first pump is increased, the input power of the second pump is improved, the degradation of the noise index can be reduced, and the optimization of the noise index of the optical fiber amplifier is realized.
If the noise margin is large, the proportion of the other pumps is increased to optimize the transient index, and the setting of the pumping current ratio is not too high or too low, which causes the process of desaturation to become slow, the control precision of the pumping current ratio is 1%, and the adjustable range of the pumping current ratio is usually 20% -150%.
The limitation of the adjustable range of the pump current ratio can be relaxed if the fiber amplifier is required. In one embodiment, the default value of the pump current ratio is typically 100%, and the pump current ratio is adjusted to determine the pump current ratio according to the noise figure, typically when the input optical power is low.
In another embodiment, step 101 comprises: the desired gain is set and the pump current ratio is adjusted to reduce the noise figure under the condition that the gain of the fiber amplifier is locked to the desired gain.
In an embodiment, the pump current ratio may be determined according to the performance index of the optical fiber amplifier, such as the noise index and the transient index of the optical fiber amplifier, and the optimization of the performance of the optical fiber amplifier is achieved by adjusting the drive current ratio of each pump.
In one embodiment, step 102 comprises: a feed forward control algorithm is used to determine the desired output current of the first pump based on the input power and the desired gain. Specifically, the DAC (Digital-to-analog converter) value of the actual output current of each Pump (Pump _ DAC) is related to the desired gain (gain) and input power (input _ power) by a binary function represented as: if the input _ power is f (input _ gain), i.e. the feed-forward formula, the desired output current value of the first Pump can be determined according to the feed-forward formula, knowing the input power and the desired gain.
In one embodiment, before the feedforward control algorithm is used to determine the desired output current value of the first pump, the feedforward equation needs to be scaled, i.e., the relevant parameters in the feedforward equation are determined.
Before the determining the desired output current value of the first pump using the feed forward control algorithm, the method further comprises: under different expected gains, determining the actual output current value of the first pump under different input powers by adopting a feedback control algorithm;
performing linear fitting according to the corresponding relation between the input power and the actual output current value to obtain a fitting curve;
and determining a feedforward control parameter of the first pump according to the fitted curve, wherein the feedforward control parameter is used for the feedforward control algorithm to determine a desired output current value of the first pump.
Specifically, relevant parameters in a first Pump feedforward formula Pump _ DAC ═ f (input _ power, gain) are determined according to a fitted curve, so that feedforward control parameters of the first Pump are determined, and feedforward calibration is completed. The embodiment carries out feedforward calibration by adopting feedback control, simplifies the feedforward calibration process, is convenient for realizing the automatic calibration of feedforward parameters, and greatly improves the calibration consistency and the production efficiency.
In some embodiments, said determining a desired output current of said first pump using a feed forward control algorithm based on an input power and a desired gain comprises:
recording feedback control values corresponding to different input powers under different expected gains according to a feedback control algorithm; wherein the feedback control value is: an error value between a desired output current value of the first pump and an actual output current value of the first pump; the feedback control value is dynamically varied.
And determining the expected output current value of the first pump according to the expected gain and the input power and a feedforward control algorithm and the feedback control value.
Specifically, the optical fiber amplifier may have insertion loss of different degrees in practical application, and when the feedforward is calibrated by feedback control, the feedforward control parameter may have an error or cause such as pump aging, and it is difficult to achieve high-precision gain locking only by the feedforward control. Therefore, on the basis of feedforward control, feedback control is added, feedback control values are determined through the feedback control to compensate the feedforward control, specifically, feedback control values corresponding to input power under each gain are recorded according to the feedback control, and a two-dimensional feedforward compensation table is established. By establishing the feedforward compensation table, the precision of feedforward gain locking is improved and the transient characteristic is improved by table lookup compensation.
In an embodiment, the feedback control may be implemented by using a PID feedback algorithm, or may be implemented by using another feedback control algorithm according to actual requirements, which is not limited in this embodiment. Specifically, errors of the expected output power and the actual detection output power are calculated through a PID controller, a feedback control value of the final feedback control and an output current value of the pump calculated through the feedforward control are added by using a reasonable proportional parameter and a reasonable differential parameter, the output current DAC of the pump is determined to adjust the driving current of the pump, the high-precision locking of the gain is realized, and the expected gain precision is locked within 0.1 db.
In one embodiment, in step 103, specifically, if the pumping current ratio is 120% and the desired output current of the first pump is 100mA, the desired output current of the second pump is 120mA according to the pumping current ratio.
In one embodiment, step 104 includes: and adjusting the driving current of the pump in a stepping mode according to the DAC value of the expected output current of the pump in the optical fiber amplifier, so that the gain of the optical fiber amplifier reaches the expected gain, and the locking of the gain is realized. For example, if the desired gain is 50, modulation is performed by increasing 1 every time starting from 0 until the actual gain reaches 50. By adopting a step adjusting mode, the situations of pump current overshoot and undershoot caused by too fast adjustment are reduced.
In some embodiments, after determining the actual output current of the first pump, the method further comprises:
determining an upper current limit and a lower current limit of the first pump according to the current limiting parameters of the first pump and the second pump and the pump current ratio;
determining a feedback control maximum value and a feedback control minimum value of the first pump according to the current upper limit of the first pump, the current lower limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
when performing feedback control, a feedback control value input to the feedforward control algorithm is selected from between the feedback control maximum value and the feedback control minimum value.
Specifically, according to the current rated ranges of the first pump and the second pump, the maximum value and the minimum value of the first pump rated current and the maximum value and the minimum value of the second pump rated current are obtained, and the maximum value and the minimum value of the first pump rated current are divided by the pump current ratio corresponding to the first pump to obtain the current maximum value and the current minimum value calculated by the first pump.
And dividing the maximum value and the minimum value of the rated current of the second pump by the pump current ratio corresponding to the second pump to obtain the maximum value and the minimum value of the current calculated by the second pump. Comparing the maximum value of the current calculated by the first pump with the maximum value of the current calculated by the second pump, selecting the maximum current value as the upper current limit of the first pump, comparing the minimum value of the current calculated by the first pump with the minimum value of the current calculated by the second pump, and selecting the minimum current value as the lower current limit of the first pump. Subtracting the output current value of the first pump determined by the feedforward control from the current upper limit of the first pump to obtain the feedback control maximum value of the first pump; and subtracting the output current value of the first pump determined by the feedforward control from the lower current limit of the first pump to obtain the feedback control minimum value of the first pump.
And when feedback control compensation is carried out, limiting the feedback control value, and enabling the feedback control value not to be larger than the maximum feedback control value and not to be smaller than the minimum feedback control value, so that the sum of the output current value calculated by feedforward control of the first pump and the feedback control value does not exceed the current upper limit and the current lower limit of the first pump.
In this embodiment, the current value of the first pump when each pumping current reaches the maximum value or the minimum value is calculated according to the pumping current ratio of each pump, and the maximum current value and the minimum current value of the first pump are selected as the current upper limit and the current lower limit of the first pump, respectively, to determine the maximum value and the minimum value of the feedback control of the first pump. On the first hand, the control that all pumps can reach the maximum value and the minimum value in the current rated range during feedback control is met, and the utilization efficiency of the pumps is improved. In the third aspect, when the first pump cannot reach the expected gain according to the current pump ratio, the adjustable pump still exists in the optical fiber amplifier to enable the optical fiber amplifier to reach the expected gain, the utilization efficiency of the pump in the optical fiber amplifier is improved, the condition that the pump needs to be added to reach the expected gain of the optical fiber amplifier is reduced, and the cost is saved.
In one embodiment, the method comprises: determining whether an abnormal current value outside a corresponding current rated range exists in the actual output current values; if the abnormal current value exists, determining a limited output current value according to the abnormal current value and the corresponding current rated range; and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value.
Specifically, when the actual output current value of the pump in the optical fiber amplifier exceeds the current rated range of the pump, the actual output current of the pump is limited, and the actual output current value of the pump is limited to be the limited output current value through a preset limiting rule, wherein the limited output current value is within the current rated range of the pump. The preset restriction rule includes at least one of:
when the actual output current of any pump exceeds the maximum value of the corresponding rated current, limiting the output current value to be the maximum value of the pump rated current;
and when the actual output current of any pump is smaller than the minimum value of the corresponding rated current, limiting the output current value to be the minimum value of the rated current of the pump.
Any pump herein may be any one of the aforementioned first pump and second pump.
The adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value comprises:
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value and the control error value of the pump.
Specifically, the feedback control includes proportional control. When the actual output current of the pump exceeds the current rating of the pump, then the pump current ratio will no longer be a fixed value, for example: when the pumping current ratio is 100%, the rated upper limit of the current of the first pump is 100mA, and the rated upper limit of the current of the second pump is 120mA, if the actual output current of the first pump is 100mA at this time, but the optical fiber amplifier still does not reach the desired gain, the output current of the second pump is not calculated according to the fixed current pumping ratio any more, the actual output current value of the second pump needs to be continuously increased within the rated range of the current of the second pump, so that the gain of the optical fiber amplifier can reach the desired value, and the ratio of the driving current of the first pump to the driving current of the second pump at this time is no more than 100%.
During feedback control, the actual output current of the pump will enter a saturation state if the actual output current exceeds the limit of the rated current range of the pump and then continues to be adjusted. At the moment, the limited output current value of the pump in the saturated state is added with the proportional component error in the control error value of the feedback control to carry out feedback regulation, and the exit of the pump supersaturation state can be accelerated through the proportional component error of the feedback control, so that the transient characteristic of the optical fiber amplifier is improved. After the feedback control, the actual output current of the pump is limited again, and the actual output current value of the pump is controlled within the current rated range of the pump.
The embodiment of the invention provides a control method of an optical fiber amplifier, and on the first hand, a pumping current ratio control method is used for replacing the current independent control method of each pump, and the control method of multiple pumps is normalized into a single-pump control method, so that the resources required by design are reduced, the cost of chip type selection is reduced, the difficulty of design is reduced, and the research and development efficiency is improved. In the second aspect, the feedforward calibration is carried out by using feedback control, the calibration of an automatic script can be easily designed, the feedforward calibration process is greatly simplified, and the calibration consistency and the production efficiency are improved. In the third aspect, the control of all pumps is realized by using a pumping current ratio control calculation mode, and the transient characteristics are improved while the noise index is ensured. In the fourth aspect, the actual output current of the pump is limited and the feedback control is limited, so that the utilization rate of the pump is improved and the cost is reduced while the working safety and stability of the pump are ensured, and the transient characteristic is improved by introducing the error component of the feedback control.
With reference to the above embodiments of the present invention, an exemplary application of the embodiments of the present invention in a practical application scenario will be described below.
FIG. 2 is a logic diagram of a control method of a one-stage multi-pump erbium-doped fiber amplifier. In the prior art, the erbium-doped fiber amplifier with one-stage multi-pump consumes more resources in design, an FPGA chip with larger resources needs to be selected, configuration parameters can be multiplied according to the number of pumps, a larger memory needs to be selected, feed-forward calibration is complex in test, calibration consistency and transportability are not high, transient characteristics are general, and efficiency is low in batch production.
The example provides a control method of a novel multi-pump cascade erbium-doped fiber amplifier, adopts a digital control scheme of FPGA, and aims to solve the defects of the prior art, solve the problems of excessive resource consumption and the like, reduce the cost of chip type selection, reduce the research and development difficulty, shorten the research and development period, simplify the feedforward calibration, improve the transient characteristic, improve the calibration consistency and the transportability, facilitate batch production and bring good economic benefits.
Fig. 3 is a logic diagram of a control method of a novel multi-pump cascaded erbium-doped fiber amplifier provided by the present example. The basic steps of the control method for the novel multi-pump cascaded erbium-doped fiber amplifier provided by the present example are shown in fig. 4:
Specifically, in this example, a PID feedback control algorithm is used for the pumping, parameters such as a proportional component factor, a differential component factor, an adjustment period, a PID fractional bit component, and the like of the PID controller are set, a feedback control enable switch is turned on, an expected gain range is traversed, ASE power at each gain point is determined, if the ASE power exists, the current ASE power determined by the feedback control algorithm and the current input power are subtracted from the actual output of the current optical fiber amplifier, and the expected output power of the pumping is determined again. The gain locking precision of the signal power is ensured by compensating the ASE power.
In step 402, the pumping current ratio is determined.
Specifically, a pump which is connected into the first erbium-doped fiber in the fiber amplifier is used as a first pump. And starting feedback algorithm control, and determining a proper pumping current ratio according to the noise index on the premise of ensuring that the optical fiber amplifier can achieve the expected gain. The default pump ratio is 100%. In the specific process of adjusting the pump current ratio, the ratio needs to be adjusted according to different optical path structures of the optical fiber amplifier, and the proportion of the first pump is generally made as large as possible so as to optimize the noise index. If the noise margin is large, the proportion of the remaining pumps can be increased to optimize the transient index, the setting of the pumping current ratio is not suitable for being too high or too low, which causes the desaturation process to be slow, therefore, the adjustable range of the pumping current ratio is generally 20% -150%, and if the optical fiber amplifier cannot reach the desired gain according to the fixed pumping current ratio or other requirements exist, the range limitation of the pumping current ratio can be released.
And 403, calibrating the feedforward parameters.
Fixing the current ratio of the pump, starting a feedback algorithm to control and calibrate the control parameters of a feedforward algorithm, scanning each input power point under each gain point, recording the current DAC value of the first pump determined by the feedback algorithm, and then carrying out linear fitting to obtain feedforward calibration parameters, wherein the step is a coarse adjustment process for locking feedforward gain.
And step 404, compensating the pumped current DAC value determined by the feedforward algorithm through feedback control, and determining the pumped current DAC value.
Starting feedback control and feedforward control, and calibrating feedforward compensation. Specifically, scanning and recording the current DAC value calculated by the feedback algorithm of each input power point under each gain point, then storing the current DAC value into a two-dimensional table, compensating by looking up the table, and adding the current DAC value calculated by the feedback algorithm to the current DAC value calculated by the feedforward algorithm to obtain the pumped current DAC value. This step is a fine tuning process for the feed forward gain lock.
In step 405, the current DAC values for each pump are determined.
Specifically, a feedforward algorithm control and a feedback algorithm control are started, the current DAC value of the first pump is determined according to the current input light and the target gain, and then the current DAC value of each pump is calculated according to the pump current ratio.
At step 406, the feedback control value is limited.
Dividing the rated maximum and the rated minimum of the current of each pump by the ratio of the pump current to obtain the calculated maximum and the calculated minimum of each pump current, selecting the maximum and the minimum from the calculated maximum and the calculated minimum of all the pump currents as the current maximum of the first pump and the current minimum of the first pump, respectively, limiting the feedback control according to the determined current maximum and the minimum of the first pump, wherein the limitation is applied to the differential quantity of a PID controller, and finally, determining the sum of the current value calculated by a feed-forward algorithm and the current value calculated by a feedback algorithm, and limiting the sum to ensure that the sum of the current value calculated by the feed-forward algorithm and the current value calculated by the feedback algorithm is not more than the current maximum of the first pump or less than the current minimum of the first pump. By the limitation on the feedback control, when the current of the pump in the optical fiber amplifier reaches the maximum current or the minimum current of the rated current range, the pump ratio locking is released, and other pumps can be continuously adjusted in the rated working current range, so that the gain locking or the power locking of the erbium-doped optical fiber amplifier is realized.
In step 407, the current DAC value of each pump is limited to the current rating of the corresponding pump to drive each pump.
Specifically, the calculated current DAC value of each pump is subjected to a first level of limitation. The first level of limitation is specifically: and limiting the DAC value of the pumped current within the current rated range corresponding to the pump.
And if the DAC value of the current of the pump exceeds the rated maximum current value of the pump or the rated minimum current limit value of the pump, performing desaturation treatment on the pump. And during feedback control, adding the proportional component of the PID controller in the feedback algorithm to the pumped current DAC value subjected to the first-stage limitation, then performing second-stage limitation on the pumped current DAC value at the moment, and limiting the pumped current DAC value within a current rated range corresponding to the pump.
According to the method, the optical fiber amplifier can realize rapid and high-precision gain locking, the utilization of resources is reduced, the feed-forward calibration and the production efficiency are improved, and the method has good transient characteristics, good portability and high consistency of module characteristics.
The example provides a control method of a novel multi-pump cascaded erbium-doped fiber amplifier, a digital control mode of a programmable logic device FPGA is adopted, on one hand, the control of a one-level double-pump or one-level multi-pump cascaded erbium-doped fiber amplifier is normalized into the control of a one-level one-pump single-pump structure erbium-doped fiber amplifier by taking a first pumping current as a reference and calculating the rest pumping currents according to the pumping current ratio, so that resources required by design are reduced, the cost of chip type selection is reduced, the difficulty of design is reduced, and the research and development efficiency is improved. In the second aspect, the feedforward calibration is carried out by using feedback control, the calibration of an automatic script can be easily designed, the feedforward calibration process is greatly simplified, and the calibration consistency and the production efficiency are improved. In the third aspect, the pump current ratio is used for control, feedback control and feedforward control are spread on each pump, the transient characteristic is improved while the noise index is ensured, and experimental data prove that in the optical path structure of the first-stage two pumps, the transient index of the ratio control method adopted is optimized by 0.5db compared with that of the independent control method of each pump. In the fourth aspect, the actual output current of the pump is limited and the feedback control is limited, so that the utilization rate of the pump is improved and the cost is saved while the working safety and stability of the pump are ensured; by introducing a feedback control error component, the transient characteristics of the fiber amplifier are improved.
Continuing with the description of the control apparatus 50 for an optical fiber amplifier provided by the embodiment of the present invention, in some embodiments, the control apparatus for an optical fiber amplifier can be implemented by a software module. Referring to fig. 5, fig. 5 is a schematic structural diagram of a control apparatus 50 for an optical fiber amplifier according to an embodiment of the present invention, where the control apparatus 50 for an optical fiber amplifier according to an embodiment of the present invention includes: an embodiment of the present invention further provides a control apparatus for an optical fiber amplifier, including:
a ratio control module 501, configured to determine a pumping current ratio according to a noise parameter of the optical fiber amplifier, where the pumping current ratio is: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
a determining module 502 for determining a desired output current value of the first pump according to the input power and the desired gain of the fiber amplifier; determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
a driving module 503, configured to drive the first pump according to a desired output current value of the first pump and drive the second pump according to a desired output current value of the second pump.
In some embodiments, the determining module is specifically configured to determine the desired output current value of the first pump by using a feed-forward control algorithm according to the input power and the desired gain of the optical fiber amplifier.
In some embodiments, the apparatus further comprises a calibration module to:
under different expected gains, determining the actual output current value of the first pump under different input powers by adopting a feedback control algorithm;
performing linear fitting according to the corresponding relation between the input power and the actual output current value to obtain a fitting curve;
and determining a feedforward control parameter of the first pump according to the fitted curve, wherein the feedforward control parameter is used for the feedforward control algorithm to determine a desired output current value of the first pump.
In some embodiments, the determining module is further specifically configured to:
recording feedback control values corresponding to different input powers under different expected gains according to a feedback control algorithm; wherein the feedback control value is: an error value between a desired output current value of the first pump and an actual output current value of the first pump;
and determining the expected output current value of the first pump according to the expected gain and the input power and a feedforward control algorithm and the feedback control value.
In some embodiments, the apparatus further comprises:
a protection module, configured to determine an upper current limit and a lower current limit of the first pump according to a current limiting parameter of the first pump and the second pump and the pump current ratio;
determining a feedback control maximum value of the first pump according to the current upper limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
determining a feedback control minimum value of the first pump according to the lower current limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
when performing feedback control, a feedback control value input to the feedforward control algorithm is selected from between the feedback control maximum value and the feedback control value.
In some embodiments, the protection module is further to:
determining whether an abnormal current value outside a corresponding current rated range exists in the actual output current values; if the abnormal current value exists, determining a limited output current value according to the abnormal current value and the corresponding current rated range;
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value.
In some embodiments, the protection module is specifically configured to:
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value and the control error value of the pump.
In some embodiments, the protection module may divide the protection of the optical fiber amplifier into two stages, where the first stage limits the desired output current of the pump calculated by the pump current ratio, limits the desired output current within the current rating range of the corresponding pump, and converts the desired output current value exceeding the corresponding current rating range into the limited output current value. If the expected output current value of the pump exceeds the current rated range of the pump and the optical fiber amplifier does not reach the expected gain at the moment, the pump ratio is not fixed and the phenomenon of supersaturation is formed at the same time; and the second-stage limitation is to add the proportional component error value of the PID controller in the feedback algorithm control to the limited output current, perform feedback regulation, limit the rated range of the current of the pumping again, and adjust the driving of the pumping corresponding to the abnormal current value.
In some embodiments, the driving module is specifically configured to: adjusting the driving current for driving the first pump in a stepping mode according to the expected output current value of the first pump; and adjusting the driving current for driving the second pump in a stepping mode according to the expected output current value of the second pump.
In a first aspect, a method for controlling a pump current ratio is used to replace a current method for independently controlling each pump, and a control method for multiple pumps is normalized to a control method for a single pump, so that resources required by design are reduced, cost for chip type selection is reduced, difficulty in design is reduced, and efficiency of research and development is improved. In the second aspect, the feedforward calibration is carried out by using feedback control, the calibration of an automatic script can be easily designed, the feedforward calibration process is greatly simplified, and the calibration consistency and the production efficiency are improved. In the third aspect, since feedback control and feedforward control are spread to each pump by using a method of pump current ratio control, transient characteristics are improved while a noise figure is secured. In the fourth aspect, the actual output current of the pump is limited and the feedback control is limited, so that the utilization rate of the pump is improved while the working safety and stability of the pump are ensured, and the transient characteristic is improved by introducing a feedback control error component.
An embodiment of the present invention further provides an electronic device, where the electronic device includes:
a memory for storing executable instructions;
and the processor is used for realizing the control method of the optical fiber amplifier provided by the embodiment of the invention when executing the executable instructions stored in the memory.
The following describes in detail a hardware structure of an electronic device of a control method for an optical fiber amplifier according to an embodiment of the present invention, where the electronic device includes, but is not limited to, a server or a terminal. Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device provided in an embodiment of the present invention, where the control device 60 of the optical fiber amplifier includes: the at least one processor 601, the memory 602, and optionally the target quantity estimation device 60 may further comprise at least one communication interface 603, and the various components in the target quantity estimation device 60 are coupled together by a bus system 604, it being understood that the bus system 604 is used to implement the connection communication between these components. The bus system 604 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 604 in fig. 6.
It will be appreciated that the memory 602 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The memory 602 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The memory 602 in the embodiment of the present invention is used to store various types of data to support the operation of the control apparatus 50 of the optical fiber amplifier. Examples of such data include: any computer program for operating on the control device 50 of the fiber amplifier, such as stored sample data, predictive models, etc., a program implementing the method of an embodiment of the invention may be contained in the memory 602.
The method disclosed by the above-mentioned embodiment of the present invention can be applied to the processor 601, or implemented by the processor 601. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium having a memory and a processor reading the information in the memory and combining the hardware to perform the steps of the method.
In an exemplary embodiment, the control Device 60 of the fiber amplifier may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, Micro Controllers (MCUs), microprocessors (microprocessors), or other electronic components for performing the above-described methods.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms. 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, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The embodiment of the invention also provides a computer-readable storage medium, which stores executable instructions, and when the executable instructions are executed by a processor, the control method of the optical fiber amplifier provided by the embodiment of the invention is realized.
In some embodiments, the computer-readable storage medium may be memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash, magnetic surface memory, optical disk, or CD-ROM; or may be various devices including one or any combination of the above memories. The computer may be a variety of computing devices including intelligent terminals and servers.
In some embodiments, executable instructions may be written in any form of programming language (including compiled or interpreted languages), in the form of programs, software modules, scripts or code, and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
By way of example, executable instructions may correspond, but do not necessarily have to correspond, to files in a file system, and may be stored in a portion of a file that holds other programs or data, such as in one or more scripts in a hypertext Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub-programs, or portions of code).
By way of example, executable instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present invention are included in the protection scope of the present invention.
Claims (11)
1. A method of controlling an optical fiber amplifier, comprising:
determining a pumping current ratio according to a noise parameter of the optical fiber amplifier, wherein the pumping current ratio is as follows: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
determining a desired output current value of the first pump based on the input power and the desired gain of the fiber amplifier;
determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
driving the first pump according to a desired output current value of the first pump;
driving the second pump according to a desired output current value of the second pump.
2. The method of claim 1, wherein determining the desired output current value of the first pump based on the input power and the desired gain of the fiber amplifier comprises:
and determining the expected output current value of the first pump by adopting a feedforward control algorithm according to the input power and the expected gain of the optical fiber amplifier.
3. The control method of claim 2, wherein prior to said determining a desired output current value for said first pump using a feed forward control algorithm, said method further comprises:
under different expected gains, determining the actual output current value of the first pump under different input powers by adopting a feedback control algorithm;
performing linear fitting according to the corresponding relation between the input power and the actual output current value to obtain a fitting curve;
and determining a feedforward control parameter of the first pump according to the fitted curve, wherein the feedforward control parameter is used for the feedforward control algorithm to determine a desired output current value of the first pump.
4. The control method of claim 2, wherein determining the desired output current of the first pump using a feed forward control algorithm based on the input power and the desired gain comprises:
recording feedback control values corresponding to different input powers under different expected gains according to a feedback control algorithm; wherein the feedback control value is: an error value between a desired output current value of the first pump and an actual output current value of the first pump;
and determining the expected output current value of the first pump according to the expected gain and the input power and a feedforward control algorithm and the feedback control value.
5. The control method of claim 4, wherein after determining the value of the output current of the first pump, the method further comprises:
determining an upper current limit and a lower current limit of the first pump according to the current limiting parameters of the first pump and the second pump and the pump current ratio;
determining a feedback control maximum value of the first pump according to the current upper limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
determining a feedback control minimum value of the first pump according to the lower current limit of the first pump and the output current value of the first pump determined by a feed-forward control algorithm;
when performing feedback control, a feedback control value input to the feedforward control algorithm is selected from between the feedback control maximum value and the feedback control value.
6. The control method according to claim 4, characterized in that the method further comprises:
determining whether an abnormal current value outside a corresponding current rated range exists in the actual output current values; if the abnormal current value exists, determining a limited output current value according to the abnormal current value and the corresponding current rated range;
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value.
7. The method of claim 6, wherein adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value comprises:
and adjusting the driving of the pump corresponding to the abnormal current value according to the limited output current value and the control error value of the pump.
8. The control method according to claim 1,
the driving the first pump according to a desired output current value of the first pump includes: adjusting the driving current for driving the first pump in a stepping mode according to the expected output current value of the first pump;
the driving the second pump according to a desired output current value of the second pump includes: and adjusting the driving current for driving the second pump in a stepping mode according to the expected output current value of the second pump.
9. A control apparatus for an optical fiber amplifier, comprising:
a ratio control module, configured to determine a pumping current ratio according to a noise parameter of the optical fiber amplifier, where the pumping current ratio is: the ratio of the drive current value of the second pump in the optical fiber amplifier to the drive current value of the first pump in the optical fiber amplifier;
a determining module for determining a desired output current value of the first pump based on an input power and a desired gain of the fiber amplifier; determining a desired output current value of the second pump in the fiber amplifier from the pump current ratio and the desired output current value of the first pump;
and the driving module is used for driving the first pump according to the expected output current value of the first pump and driving the second pump according to the expected output current value of the second pump.
10. An electronic device, comprising:
a memory for storing executable instructions;
a processor for implementing the method of any one of claims 1-8 when executing executable instructions stored in the memory.
11. A computer-readable storage medium storing executable instructions that, when executed by a processor, implement the method of any one of claims 1-8.
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