CN105897341B - Optical amplifier transient inhibition quickly approaches device and method - Google Patents
Optical amplifier transient inhibition quickly approaches device and method Download PDFInfo
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- 238000013459 approach Methods 0.000 title abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/296—Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
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Abstract
The present invention relates to a kind of inhibition of optical amplifier transient quickly to approach device and method, which has input terminal parallel sampling circuit, output end sample circuit, analog-digital converter, digital analog converter, pump laser, fifo controller and PID arithmetic module；Expand effective scope of detection using double ADC parallel samplings, when input light intensity changes, spliced by two-way ADC sampled datas, ensures that the data for computing module are really complete；By detecting input light amplitude of variation and output light intensity signal, PID compensation is made decisions, while obtaining the correction amount of PID integral terms.To realize that the transient response to different Add/drop Voice Channel rates can realize effectively inhibition in erbium-doped fiber amplifier (EDFA), the performance of EDFA is improved, ensures the reliable and stable of entire optical communication system.
Description
Technical Field
The invention relates to an optical communication device, in particular to an erbium-doped fiber amplifier (EDFA), and particularly relates to a device and a method capable of effectively inhibiting the transient state of the EDFA in the process of optical exchange at different rates.
Background
In a DWDM system, as the traffic volume increases, the number of channels required for the upper and lower optical paths also increases gradually, and the change of the number of channels causes the change of the input optical power of the EDFA, thereby generating a transient effect. The transient effects of EDFAs have a significant impact on DWDM systems. Especially for cascaded EDFAs, transient effects will significantly affect the operation of the system. An EDFA is often considered as a node without propagation delay in optical communication systems. Under the condition that the current channel allocation speed is continuously upgraded, the best performance can be realized by making the sampling rate and the control rate of the equipment the fastest. However, in practical situations, because the optical amplifier adopts a set of hardware and a control scheme, transient suppression cannot be considered for different channel configuration rates (i.e., transient rise and fall edges at different times).
For an optical amplifier with good ms-order optical switching transient suppression, the optical amplifier does not have any effect on us-order optical switching transient suppression. Optical switching in the order of ms has a mis-alignment of 1.5 dB. Currently, each top-level EDFA equipment manufacturer optimizes the transient performance of the EDFA on the channel rapid configuration level of less than 10us, and sets various technical thresholds, but the actual effect cannot meet different requirements of the system.
The problems are caused by the electrical characteristics of the input and output sampling circuit, the transmission time delay of the optical fiber in the module and the response rate of the control device, which lead the control mode of the equipment and the actual system not to be completely matched.
Disclosure of Invention
Under the condition that us-magnitude optical exchange transient characteristics are restrained to be close to physical limits, due to transmission time delay existing in an EDFA optical amplifier, electrical characteristics of an input and output sampling circuit are inconsistent, an integral term cannot be quickly reestablished when original steady state is established under the condition that input light changes, and large ms-magnitude under-rush occurs in the optical exchange transient process.
In order to overcome the defects of the existing control scheme and achieve rapid convergence for different-rate optical switching networks, the invention provides a control device for feedback compensation, which comprises: the input parallel sampling circuit adopts double-path AD sampling, so that the effective sampling range is expanded, the misoperation caused by sampling data failure due to circuit gear shifting caused by overlarge amplitude of an uplink and a downlink is avoided, and a digital signal converted from a light intensity signal is transmitted to the FIFO controller. The FIFO controller filters the two paths of sampling signals and splices the two paths of sampling signals into a correct sampling sequence so as to control feedforward output. Meanwhile, the FIFO controller generates two FIFO queues with the sampling period and the clock interval of m according to the correct sampling sequence. The IP core is calculated by special division, whether the feedback control loop is compensated or not is judged by comparing the amplitude of the input light change, and the size and the direction of the feedback compensation are determined according to the result of the amplitude calculation. And the PID calculation module obtains the operation result of the IP core calculated by division and corrects the pump drive of the EDFA.
The technical scheme adopted by the invention is as follows: under the condition that the input light intensity of the system is changed, an integral term in feedback control is compensated through the amplitude change and the slope change of the input light intensity, and the rapid approximation of the transient suppression of the EDFA under the condition that channels in the system are configured at different rates and work in an automatic gain locking working mode is digitally controlled.
Therefore, the invention provides a fast approximation device for transient suppression of an optical amplifier, which comprises: the device comprises an input parallel sampling circuit, an input end analog-to-digital converter, an output sampling circuit, an output end analog-to-digital converter, an FIFO (first in first out) controller, a division operation module and a PID (proportion integration differentiation) operation module; the input parallel sampling circuit converts a light intensity signal input into the light amplifier into an input light intensity voltage signal; the input end analog-to-digital converter converts the input light intensity voltage signal into an input light intensity sampling data signal; the FIFO controller respectively transmits the input light intensity sampling data of the current sampling time and the input light intensity sampling data before m sampling clock periods to a first-in first-out data queue; the division operation module reads data from the first-in first-out data queue and transmits the variation information of the input light intensity before and after m sampling clock periods to the PID operation module; the output sampling circuit converts the light intensity signal output from the optical amplifier into an output light intensity voltage signal; the output end analog-to-digital converter converts the output light intensity voltage signal into an output light intensity sampling data signal; the PID operation module calculates PID control parameters according to the input light intensity sampling data signals and the output light intensity sampling data signals to realize closed-loop feedback control of the optical amplifier, and the PID operation module compensates the PID control parameters according to the change information of the input light intensity.
In the above technical solution, the input end analog-to-digital converter includes a first input end analog-to-digital converter and a second input end analog-to-digital converter, the input parallel sampling circuit inputs two voltage signals proportional to the light intensity amplitude of the input optical amplifier to the first input end analog-to-digital converter and the second input end analog-to-digital converter respectively, and the first input end analog-to-digital converter and the second input end analog-to-digital converter respectively process the voltage signals with different amplitudes, so as to expand the light intensity detection range of the input optical amplifier.
In the above technical solution, the compensating the PID control parameter includes compensating an integral term in the PID control parameter.
In the above technical solution, compensating the PID control parameter includes compensating an integral term in the PID control parameter by using a differential term calculation in the PID control parameter.
In the above technical solution, the FIFO controller splices the input light intensity sample data at the current sampling time and the input light intensity sample data before m sampling clock cycles into two first-in first-out data queues according to a sequence, and generates a data sequence FIFO1 with a data structure of (D1, D2, …, Dn) and a data sequence FIFO2 with a data structure of (D1+ m, D2+ m, …, Dn + m) according to the sampling sequence, where D1 is the input light intensity value of the current sampling cycle, D1+ m is the input light intensity value before m sampling clock cycles, head data Dn of the data sequence FIFO1 is the light intensity value before n sampling clock cycles, head data Dn + m of the data sequence FIFO2 is the light intensity value before n + m sampling cycles, where m and n are positive integers, and m > n > 1.
In the above technical solution, whether the PID control parameter is compensated is determined according to the following determination conditions:
decision condition 1: | (Σ FIFO1- Σ FIFO2) |/(Σ FIFO1+ Σ FIFO2) < Δ D
Decision condition 2: i (Sigma FIFO 1-Sigma FIFO2) |/(Sigma FIFO1+ Sigma FIFO2) ≧ Δ D
The Σ FIFO1 is a sum of the data queue FIFO1, the Σ FIFO2 is a sum of the data queue FIFO2, and Δ D is a configurable proportional relationship, which represents a detected light intensity variation amplitude of the input optical amplifier after secondary filtering by the FIFO controller and the division module.
In the above technical solution, the integral term of the PID control parameter is compensated according to the following formula:
dFIFO＝|(ΣFIFO1-ΣFIFO2)|/(ΣFIFO1+ΣFIFO2)
PID＝P*error0+D*error0+ΣI*error
wherein dFIFO is the calculation result of the division calculation module and represents the amplitude of the light intensity variation of the input light amplifier, F (dFIFO) is the function of dFIFO and represents the compensation calculation of the integral term in the PID control parameter, error is the gain error of the light amplifier, and error is the gain error of the light amplifier0For gain error of the current sampling clock period, errornThe gain error obtained at the nth sampling clock cycle is shown in P, I, D, which are proportional term, integral term and differential term in the PID control parameters.
In the above technical solution, the optical amplifier is an erbium-doped fiber amplifier, a raman fiber amplifier, a hybrid fiber amplifier, or a high-power fiber amplifier.
The invention also provides an EDFA transient suppression fast approximation method, which is characterized by comprising the following steps: converting the light intensity signal of the input light amplifier into an input light intensity voltage signal; converting the input light intensity voltage signal into an input light intensity sampling data signal; calculating to obtain the change information of the input light intensity before and after m sampling clock periods according to the input light intensity sampling data of the current sampling time and the input light intensity sampling data before m sampling clock periods; converting the light intensity signal output from the optical amplifier into an output light intensity voltage signal; converting the output light intensity voltage signal into an output light intensity sampling data signal; and calculating PID control parameters according to the input light intensity sampling data signals and the output light intensity sampling data signals to realize closed-loop feedback control of the EDFA, and compensating the PID control parameters according to the change information of the input light intensity.
In the above technical solution, compensating the PID control parameter includes compensating an integral term in the PID control parameter by using a differential term calculation in the PID control parameter.
The invention achieves the following technical effects:
the invention uses parallel sampling to accurately capture the change of input light intensity, and expands the time span of data comparison by constructing two first-in first-out queues related to the light intensity input to the EDFA, so as to achieve the effect of detecting the secondary filtering of the input light intensity, and finally uses the amplitude or slope of the light intensity change to correct the integral term in feedback calculation, thereby achieving the effect that the channel can be rapidly and stably output when configuring equipment at different rates.
The invention realizes that the EDFA is in an automatic gain locking (AGC) control mode by the optimized design of the PID control algorithm of the optical amplifier pump, inhibits the EDFA transient effect under the condition of light intensity change of all channel configuration rates, meets the transient inhibition requirement in future all-optical network communication, and provides a solution for transmission signal distortion caused by the uplink and downlink and intensity modulation in an optical communication system.
Drawings
FIG. 1 is a block diagram of a transient suppression fast approximation apparatus
FIG. 2 is a working block diagram of a parallel sampling circuit, a FIFO controller, and a division operation IP core
FIG. 3 is a schematic diagram of the drive scheme of the EDFA transient suppression fast approximation device pump
The labels in the figure are: the device comprises a parallel sampling circuit 101, an analog-to-digital converter ADC 1102, an analog-to-digital converter ADC 2103, a FIFO controller 104, a first-in first-out data queue FIFO1105, a first-in first-out data queue FIFO2106, a division operation IP core 107, an output sampling circuit 108, an analog-to-digital converter ADC3109, a PID operation module 110, a digital-to-analog converter DAC 111, a pump 112 and an erbium-doped fiber EDF 113.
The drawings provide an explanation of the specific embodiments of the present invention, and together with the detailed description, serve to explain practical applications of the invention, and are not intended to limit the scope of the invention, as defined in the appended claims.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description, in order to facilitate the understanding and implementation of the invention by those skilled in the art.
The existing optical amplifier gain control loop generally comprises a (single-path) input sampling circuit, an input end analog-to-digital converter, an output sampling circuit, an output end analog-to-digital converter, an operation control module, a digital-to-analog converter and a pumping light source. Input light of the EDFA is converted into a voltage signal through an input sampling circuit, and an input end analog-to-digital converter generates digital quantity representing the strength of the input light; output light of the EDFA is converted into a voltage signal through an output sampling circuit, and an output end analog-to-digital converter generates digital quantity representing the strength of the output light. The digital quantity of the input light intensity and the output light intensity is input into an operation control module, the digital quantity is obtained by jointly calculating according to a Gain value Gain and a spontaneous emission ASE set by a system, a Gain control deviation error is obtained, a PID output calculation result is obtained by proportional integral derivative PID operation according to the Gain control deviation error and is transmitted to a digital-analog converter, a laser of a pump light source is driven to generate pump light, and light amplification of the EDFA under the control of a Gain loop is achieved. However, due to the difference in electrical characteristics between the input sampling circuit and the output sampling circuit, the delay of the optical fiber in the module and the response rate of the control device, the control mode of the gain control loop of the optical amplifier cannot be completely matched with the actual system, and the transient suppression requirements under different channel configuration rates cannot be met.
The transient suppression fast approximation device method provided by the invention is used for a control device of an optical amplifier gain loop, and can be used for transient suppression of an erbium-doped fiber amplifier (EDFA). The transient suppression fast approximation device, as shown in fig. 1, includes an input parallel sampling circuit 101, an analog-to-digital converter ADC 1102, an analog-to-digital converter ADC 2103, a FIFO controller 104, a first-in-first-out data queue FIFO1105, a first-in-first-out data queue FIFO2106, a division operation IP core 107, an output sampling circuit 108, an analog-to-digital converter ADC3109, a PID operation module 110, a digital-to-analog converter DAC 111, and a pump 112.
The input parallel sampling circuit 101 converts a light intensity signal input into an erbium-doped fiber amplifier (EDFA) into a voltage signal, the amplitude of the voltage signal is in a linear relationship with the intensity of the light signal input into the EDFA, the converted voltage signal is divided into two paths and input into the analog-to-digital converter ADC 1102 and the analog-to-digital converter ADC 2103, the analog-to-digital converter ADC 1102 and the analog-to-digital converter ADC 2103 respectively convert electrical signals corresponding to different light intensity amplitude ranges into digital signals, and therefore the light intensity detection range is expanded, and the input parallel sampling circuit 101 is matched with the input parallel sampling circuit to ensure that the input light intensity signal can be effectively detected under different input light intensity conditions and light channel configuration conditions. The two paths of voltage signals are converted into two paths of digital signals through the analog-to-digital converter ADC 1102 and the analog-to-digital converter ADC 2103 and then output to the FIFO controller 104, and the two paths of digital signals after analog-to-digital conversion are spliced and filtered by the FIFO controller 104 and then are transmitted to the PID operation module 110; meanwhile, the FIFO controller 104 transmits the input light intensity data to the FIFO1105 in the FIFO data queue in order according to the sampling time, the FIFO controller 104 transmits the m pieces of sampling data of the light intensity before the clock to the FIFO2106 in the FIFO data queue, the dedicated division operation IP core 107 calculates the compensation coefficient of the integral term of the PID operation module 110 according to the change of the input EDFA light intensity before and after m sampling periods, and transmits the intensity change amplitude information of the input light to the PID operation module 110.
The output sampling circuit 108 converts the light intensity signal output by the EDFA into a voltage signal, the amplitude of the voltage signal is in a linear relationship with the intensity of the light signal output by the EDFA, the converted voltage signal is input into the analog-to-digital converter ADC3109, the output light digital quantity is transmitted to the PID operation module 110, the PID operation module 110 also performs low-pass filtering at the same time, and the circuit noise is removed to obtain a smooth and accurate output light power value.
Fig. 2 is a working block diagram of the parallel sampling circuit 101, the FIFO controller 104, the division IP core 107, the first-in first-out data queue FIFO1105 and the first-in first-out data queue FIFO2106 shown in fig. 1. The parallel sampling circuit 101 samples the light intensity signal input into the EDFA according to the sampling period, the light intensity signal is converted into a digital signal by the analog-to-digital converter ADC 1102 and the analog-to-digital converter ADC 2103 and is sent into the FIFO controller 104, the digital signal series represents the light intensity value input into the EDFA at each sampling time, the FIFO controller 104 filters the high-frequency noise in the digital signal series by low-pass filtering, and the light intensity data at the current sampling time and the sampling data of the light intensity before m clocks are respectively spliced into two first-in first-out data queues according to the sequence by special data splicing treatment, a data sequence FIFO1 with the data structure of (D1, D2, …, Dn) and a data sequence FIFO2 with the data structure of (D1+ m, D2+ m, …, Dn + m) are generated according to the sampling sequence, wherein D1 is the light intensity value of the current sampling period, D1+ m is the light intensity value before m sampling periods, and the head data Dn of the data sequence FIFO1 is the light intensity before n sampling periods, the head data Dn + m of the data sequence FIFO2 is the light intensity value before n + m sampling periods, wherein m and n are positive integers and m > n >1, and the specific values of m and n are determined comprehensively according to the sampling rate and the transmission rate of the signal input to the EDFA. Preferably, data sequence FIFO1 is buffered by FIFO1105 and data sequence FIFO2 is buffered by FIFO2106, updating in real time according to a FIFO scheme.
The data sequence FIFO1 and the data sequence FIFO2 are input into the division operation IP core 107 to be operated so as to realize accurate detection of the light intensity change of the input EDFA and calculation of the light intensity amplitude change value. The amplitude and trend of the input light change can be obtained by comparing the sum of the two data sequence FIFOs, the sum itself can also have the effect of smoothing filtering, and then the data used by the division IP core 107 for division is more real, and those skilled in the art should also understand that the two FIFO sequences can be realized by extracting signals of different time periods in one FIFO queue for comparison.
The dedicated division IP core 107 determines whether to compensate the feedback output according to the following formula:
decision condition 1: | (Σ FIFO1- Σ FIFO2) |/(Σ FIFO1+ Σ FIFO2) < Δ D
Decision condition 2: i (Sigma FIFO 1-Sigma FIFO2) |/(Sigma FIFO1+ Sigma FIFO2) ≧ Δ D
The Σ FIFO1 is the sum of the FIFO1 queue, the Σ FIFO2 is the sum of the FIFO2 queue, and Δ D is a configurable proportional relationship, which represents the detected light intensity variation amplitude of the input EDFA after the secondary filtering by the FIFO controller 104 and the division operation IP core 107.
When the decision condition 1 is satisfied, that is, | (Σ FIFO1- Σ FIFO2) |/(Σ FIFO1+ Σ FIFO2) < Δ D, it is considered that the light intensity of the input EDFA is stable and the integral term of the PID operation module 110 does not need to be compensated;
when the decision condition 2 is satisfied, that is, | (Σ FIFO1- Σ FIFO2) |/(Σ FIFO1+ Σ FIFO2) ≧ Δ D, it is considered that the light intensity input to the EDFA changes, the original feedback loop steady state has been destroyed, and the integral term of the PID operation module 110 needs to be compensated.
That is to say, the division operation IP core 107 obtains the power variation amplitude and slope of the input signal and the power variation amplitude or slope of the output signal through the detected input light variation amplitude and output light intensity signal, and finally obtains the gain variation amplitude or slope through calculation, so as to determine the integral term compensation of the PID operation module 110 and obtain the correction amount of the PID integral term.
In the working state of the device, the first-in first-out data queue FIFO1105, the first-in first-out data queue FIFO2106 and the special division operation IP core 107 are updated in real time according to a first-in first-out mechanism.
Fig. 3 is a block diagram of a structure in which a Pump driving module 301 in an EDFA transient suppression fast approximation apparatus performs Pump driving to achieve fast convergence, a PID operation module 110 and a Pump driving module 308 in fig. 1 constitute the Pump driving module 301 in fig. 3, an FIFO controller 104 filters and removes noise from an input digital signal to generate an input AD sample DATAin302 corresponding to an input EDFA light intensity signal, outputs an AD sample through an output sampling circuit 108 and an analog-to-digital converter ADC3109 to generate an output AD sample DATAout 303 corresponding to an EDFA output light intensity signal, and calculates a system steady-state Error, namely, DATAout-DATAin, Gain-ASE according to input AD sample DATAin302 and output AD sample DATAout 303 data, where Gain is Gain of the EDFA amplifier, and ASE is amplified spontaneous emission output by the EDFA amplifier; the systematic error calculation results are pushed to the feedback calculation block 307. At the same time, the AD sample DATAin302 data is input to the pump driving module 301, and a corresponding pump driving feedforward 305 is generated according to the gain value. Meanwhile, the FIFO controller 104 pushes the data of the input AD sample DATAin302 into the division operation IP core 304 for decision, and the feedback calculation module 307 compensates the integral term of PID control according to the following formula, thereby completing the calculation of the feedback loop.
dFIFO＝|(ΣFIFO1-ΣFIFO2)|/(ΣFIFO1+ΣFIFO2)
PID＝P*error0+D*error0+ΣI*error
Wherein dFIFO is the calculation result of IP core 107 calculated by division, representing the amplitude of the light intensity change of input EDFA, and F (dFIFO) is the function of dFIFO, representing the compensation calculation of PID integral term. error0Gain error for the current clock; wherein P is proportional term in PID proportional-integral-derivative, I is integral term, D is derivative term, error0Calculated for the newest of the current sample clock in the array by input-output sampling FIFO subtractionTo linear gain difference, errornIs the calculated error of the nth time the module is started.
The existing gain control loop of the optical amplifier through the PID algorithm only carries out the accumulation of an integral term I under the previous stable state, the I accumulation generated under the condition of input and output light change is wrong when the stable I accumulation is achieved under the new state, and the accumulation term before the input light is stable is harmful to the establishment of the new stable state after the input light is stable. Since the accumulation term determines the final output, once the P-ratio term output occupies a small PID overall output in the PID module, that is, the input light approaches the final state, the erroneous I accumulation term generated before the new state is established will generate a large misadjustment to cause erroneous overshoot or undershoot, and the time for the second new state to reach stability is determined by the convergence speed (i.e., the speed at which the I accumulation finally reaches stability). The invention restrains the wrong I accumulation term by detecting the variation amplitude of the input light, thereby not damaging the establishment of the whole feedback loop and rapidly achieving the stability.
The above embodiment is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. The specific structure and the size of the device can be adjusted correspondingly according to actual needs. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. An optical amplifier transient suppression fast-approximation apparatus, comprising: the device comprises an input parallel sampling circuit, an input end analog-to-digital converter, an output sampling circuit, an output end analog-to-digital converter, an FIFO (first in first out) controller, a division operation module and a PID (proportion integration differentiation) operation module; wherein,
the input parallel sampling circuit converts the light intensity signal of the input light amplifier into an input light intensity voltage signal;
the input end analog-to-digital converter converts the input light intensity voltage signal into an input light intensity sampling data signal; the input end analog-to-digital converter comprises a first input end analog-to-digital converter and a second input end analog-to-digital converter, the input parallel sampling circuit respectively inputs two paths of voltage signals which are proportional to the light intensity amplitude of the input light amplifier into the first input end analog-to-digital converter and the second input end analog-to-digital converter, and the first input end analog-to-digital converter and the second input end analog-to-digital converter respectively correspondingly process the voltage signals with different amplitudes, so that the light intensity detection range of the input light amplifier is enlarged;
the FIFO controller respectively transmits the input light intensity sampling data of the current sampling time and the input light intensity sampling data before m sampling clock periods to a first-in first-out data queue;
the division operation module reads data from the first-in first-out data queue and transmits the variation information of the input light intensity before and after m sampling clock periods to the PID operation module;
the output sampling circuit converts the light intensity signal output from the optical amplifier into an output light intensity voltage signal;
the output end analog-to-digital converter converts the output light intensity voltage signal into an output light intensity sampling data signal;
the PID operation module calculates PID control parameters according to the input light intensity sampling data signals and the output light intensity sampling data signals to realize closed-loop feedback control of the optical amplifier, and the PID operation module compensates the PID control parameters according to the change information of the input light intensity.
2. The optical amplifier transient suppression fast approximation apparatus of any one of claim 1, wherein: compensating the PID control parameter includes compensating an integral term in the PID control parameter.
3. The optical amplifier transient suppression fast approximation apparatus of any one of claims 1-2, wherein: compensating the PID control parameter includes compensating an integral term in the PID control parameter using a differential term calculation in the PID control parameter.
4. The optical amplifier transient suppression fast approximation apparatus of any one of claim 3, wherein: the FIFO controller splices the input light intensity sampling data of the current sampling time and the input light intensity sampling data before m sampling clock cycles into two first-in first-out data queues respectively according to the sequence, and generates a data sequence FIFO1 with a data structure of (D1, D2, … and Dn) and a data sequence FIFO2 with a data structure of (D1+ m, D2+ m, … and Dn + m) according to the sampling sequence, wherein D1 is the input light intensity value of the current sampling cycle, D1+ m is the input light intensity value before m sampling clock cycles, the head data Dn of the data sequence FIFO1 is the light intensity value before n sampling clock cycles, the head data Dn + m of the data sequence FIFO2 is the light intensity value before n + m sampling cycles, wherein m and n are positive integers, and m > n > 1.
5. The optical amplifier transient suppression fast approximation apparatus of claim 4, wherein: and judging whether the PID control parameters are compensated according to the following judgment conditions:
decision condition 1: | (Σ FIFO1- Σ FIFO2) |/(Σ FIFO1+ Σ FIFO2) < Δ D
Decision condition 2: i (Sigma FIFO 1-Sigma FIFO2) |/(Sigma FIFO1+ Sigma FIFO2) ≧ Δ D
The Σ FIFO1 is a sum of the data queue FIFO1, the Σ FIFO2 is a sum of the data queue FIFO2, and Δ D is a configurable proportional relationship, which represents a detected light intensity variation amplitude of the input optical amplifier after secondary filtering by the FIFO controller and the division module.
6. The optical amplifier transient suppression fast approximation apparatus of claim 5, wherein: the integral term of the PID control parameter is compensated according to the following formula:
dFIFO＝|(ΣFIFO1-ΣFIFO2)|/(ΣFIFO1+ΣFIFO2)
PID＝P*error0+D*error0+ΣI*error
wherein dFIFO is the calculation result of the division calculation module and represents the amplitude of the light intensity variation of the input light amplifier, F (dFIFO) is the function of dFIFO and represents the compensation calculation of the integral term in the PID control parameter, error is the gain error of the light amplifier, and error is the gain error of the light amplifier0For gain error of the current sampling clock period, errornThe gain error obtained at the nth sampling clock cycle is shown in P, I, D, which are proportional term, integral term and differential term in the PID control parameters.
7. The optical amplifier transient suppression fast approximation apparatus of any one of claim 1 or claim 2 or claim 4 or claim 5 or claim 6, wherein: the optical amplifier is an erbium-doped optical fiber amplifier, a Raman optical fiber amplifier, a hybrid optical fiber amplifier or a high-power optical fiber amplifier.
8. The method for quickly approximating transient suppression of the optical amplifier is characterized by comprising the following steps:
converting the light intensity signal of the input light amplifier into an input light intensity voltage signal;
the method comprises the steps that two paths of voltage signals proportional to the light intensity amplitude of an input light amplifier are respectively input into a first input end analog-to-digital converter and a second input end analog-to-digital converter by adopting the input end analog-to-digital converters comprising the first input end analog-to-digital converter and the second input end analog-to-digital converter, and the first input end analog-to-digital converter and the second input end analog-to-digital converter respectively and correspondingly process the voltage signals with different amplitudes, so that the light intensity detection range of the input light amplifier is expanded, and the input light intensity voltage signals are converted into input;
calculating to obtain the change information of the input light intensity before and after m sampling clock periods according to the input light intensity sampling data of the current sampling time and the input light intensity sampling data before m sampling clock periods;
converting the light intensity signal output from the optical amplifier into an output light intensity voltage signal;
converting the output light intensity voltage signal into an output light intensity sampling data signal;
and calculating PID control parameters according to the input light intensity sampling data signals and the output light intensity sampling data signals to realize closed-loop feedback control of the EDFA, and compensating the PID control parameters according to the change information of the input light intensity.
9. The optical amplifier transient suppression fast approximation method of claim 8, wherein: compensating the PID control parameter includes compensating an integral term in the PID control parameter using a differential term calculation in the PID control parameter.
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| US6172801B1 (en) * | 1997-01-14 | 2001-01-09 | Fujitsu Limited | Optical amplifier, optical amplifying apparatus, optical transmitter for use in optical communications system, and optical surge suppression method for the optical amplifier |
| CN1430370A (en) * | 2001-12-29 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Erbium adulterated optical fiber amplifier gain control apparatus |
| CN101086594A (en) * | 2006-06-07 | 2007-12-12 | 中兴通讯股份有限公司 | Optical amplifier transient suppression method and control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6172801B1 (en) * | 1997-01-14 | 2001-01-09 | Fujitsu Limited | Optical amplifier, optical amplifying apparatus, optical transmitter for use in optical communications system, and optical surge suppression method for the optical amplifier |
| CN1430370A (en) * | 2001-12-29 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Erbium adulterated optical fiber amplifier gain control apparatus |
| CN101086594A (en) * | 2006-06-07 | 2007-12-12 | 中兴通讯股份有限公司 | Optical amplifier transient suppression method and control circuit |
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