CN101634590B - Detection and predetermination calculational method for rapid variation light power - Google Patents
Detection and predetermination calculational method for rapid variation light power Download PDFInfo
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Abstract
A detection and predetermination calculational method for rapid variation light power comprises steps of: respectively obtaining characteristic parameters and a threshold value of an instant slope ratio of all gears of a TIA circuit which are stored in a parameter table; calculating the instant slope ratio value of output signals of the TIA circuit in real time, and comparing the real time instant slope ratio value and the threshold value of instant slope ratio; when input light signal varies quickly, determining the beginning power value of input light variation, and calculating the real variable quantity of the input light power according to the instant slope ratio of the output signals of the TIA circuit; adding the beginning light power of input light variation and input light power variable quantity obtained by predetermination calculation to obtain determination light power when input light rapid varies to serve as the real instant power of the input light, comparing the light power value obtained by predetermination and the light power value obtained according to the output signals of the TIA circuit, finishing the predetermination calculation when the predetermined light power value and the light power value are closer, using the light power value as the real instant power of the input light. The method greatly speeds up light power detection speed and can accurately display the light power value of fast variation.
Description
Technical field
The present invention relates to a kind of detection and prediction and calculation of luminous power.Particularly relate to a kind of can finishing the detection of the quick variation luminous power of accurately estimating calculating of the target power that changes and the method for prediction and calculation in input light fast-changing moment.
Background technology
In optical communication system, the optical power detecting circuit generally has two kinds: a kind of is the mutual conductance amplifying circuit that adopts logarithm operational amplifier to constitute, the advantage of this circuit is a wide dynamic range, shortcoming is lower to the detection sensitivity of transient signal at low input optical power place, is unfavorable for the detection of fast-changing luminous power; Another kind is TIA (the Transimpedance Amplifier that adopts linear operational amplifier, transimpedance is amplified) circuit, this circuit advantage is that response speed is fast, input optical power and TIA circuit be output into linear relationship, be easier to detect the quick variation of input optical signal by the output signal that detects the TIA circuit, its shortcoming is that the actual dynamic range of single span resistance TIA circuit is narrower, so need to use many gears TIA circuit to widen the dynamic range that input is surveyed usually.
At present realize that there are two defectives in input when changing the detection of luminous power fast using many gears TIA circuit:
First is under the certain situation of operational amplifier gain bandwidth product, input optical power is low more, TIA circuit gear of living in to stride the resistance meeting bigger, circuit gain is also bigger thereupon, the bandwidth of TIA circuit then can be narrower, fast-changing input optical signal can produce distortion by the TIA circuit, and it is serious more to stride the big more then distortion of resistance.The way that adopts is whether to surpass threshold value by comparing the TIA circuit output signal at present, thereby judges whether luminous power quick variation takes place, but can't accurately calculate the actual value of quick variation luminous power according to the distorted signal of TIA circuit output.
Second is when input optical signal is crossed over one or more gears and changed fast, switch switching between the adjacent gear can cause that vibration appears in the output signal of TIA circuit, the quick variation that is difficult to distinguish the TIA circuit output signal during this period be by input optical signal change fast cause or cause by the gearshift of TIA circuit.Cause at present for avoiding shifting gears subsequent control get muddled the measure commonly used adopted be after the gear switch time-delay a period of time finish up to shift process, in fact this way has ignored the detection to fast-changing luminous power when gearshift.
Summary of the invention
Technical matters to be solved by this invention is, provide a kind of can input light fast-changing moment finish to the target power that changes accurately estimate calculating, and be not subjected to the detection of quick variation luminous power of factor affecting such as distortion, vibration of TIA circuit and the method for prediction and calculation.
The technical solution adopted in the present invention is: a kind of detection of quick variation luminous power and the method for prediction and calculation comprise the steps:
Step 2 is calculated the instantaneous slope value of transimpedance amplifying circuit output signal in real time, and more real-time instantaneous slope and instantaneous slope threshold value, judges whether input optical signal quick variation takes place;
Step 3 when input optical signal takes place to change fast, is determined the initial power value that input light changes, and calculates the actual change amount of input optical power according to the instantaneous slope prediction of transimpedance amplifying circuit output signal;
Step 4, the initial luminous power that input light is changed adds the input optical power variable quantity of prediction and calculation gained, the prediction luminous power when obtaining importing light and changing fast is as the actual instantaneous power of input light;
Step 5, the optical power value that comparison prediction obtains and calculate the optical power value of gained according to transimpedance amplifying circuit output signal, when the two near the time finish prediction and calculation, the actual instantaneous power of importing light this moment equals to calculate according to transimpedance amplifying circuit output signal the optical power value of gained.
If the absolute value of the instantaneous slope of transimpedance amplifying circuit output signal is then carried out the prediction and calculation of input optical power greater than instantaneous slope threshold value, comprise following treatment step:
Step S405, the input optical power value P before the start-of-record prediction and calculation
0As the fast-changing initial power value of luminous power;
Step S406 preserves current instantaneous slope value K (x), and the optical power value P ' that calculates gained according to actual sample value is (x), wherein x=0,1,2 ..., for sampling is calculated constantly;
Step S407, more adjacent in real time instantaneous slope value K (x) is worth, and finds the instantaneous slope value K of absolute value maximum
Max(x); Step S408, the target power value P (x) that the prediction and calculation input optical power changes;
Step S409 is if find the instantaneous slope value K of absolute value maximum among the step S407
Max(x), then stop prediction and calculation, and keep adopting the maximum value calculation gained target power value P (x) of instantaneous slope absolute value constant, if current instantaneous slope value K (x) is not the maximal value of instantaneous slope absolute value among the step S407, then the target power value P (x) of gained is calculated in the prediction of output;
Step S410 judges that whether optical power value P ' value (x) is near target power value P (x);
Step S411 and step S412, when optical power value P ' (x) with the size of target power value P (x) very near the time, Output optical power value P ' (x), the output of expression transimpedance amplifying circuit is basicly stable, when optical power value P ' (x) with the size differences of target power value P (x) when big, export target performance number P (x) represents the current prediction and calculation of carrying out.
If the absolute value of the instantaneous slope of transimpedance amplifying circuit output signal is not more than instantaneous slope threshold value, then directly calculate the input optical power value according to transimpedance amplifying circuit output signal.
Also comprise in described step 1 and the step 3: change the foundation of the prediction and calculation relational expression of luminous power fast.
The prediction and calculation relational expression that changes fast luminous power be with the equivalence of transimpedance amplifying circuit on the basis of RC circuit model, and utilize the characteristics of RC circuit output signal absolute value maximum of the instantaneous slope of correspondence when input signal takes place to change fast to set up.
The prediction and calculation relational expression that changes luminous power fast is:
Wherein x represents the sequence number of continuous data, and i represents the gear sequence number of transimpedance amplifying circuit, the instantaneous slope value of K (x) expression transimpedance amplifying circuit output signal, and the input optical power variable quantity that Δ P (x) expression prediction and calculation obtains is a unit with the milliwatt, P
0The milliwatt value of the initial power when the expression input optical power changes, the milliwatt value of the instantaneous input optical power that prediction obtained during P (x) expression input optical power changed, M
iAnd N
iGear i characteristic of correspondence parameter group for the transimpedance amplifying circuit.
Parameter M in the prediction and calculation relational expression of quick variation luminous power
iAnd N
iComputing method be:
P wherein
0, P
i, Δ P
iAnd K
I, maxThe initial milliwatt value that predefined input optical power changes when representing parameter calibration respectively, termination milliwatt value, actual change amount milliwatt value, and the instantaneous slope maximal value of surveying the transimpedance amplifying circuit output signal that obtains; I represents the gear sequence number of transimpedance amplifying circuit, and n is illustrated in the number of the data sample that measures under the i gear.
The I/V conversion and the amplifying circuit of input optical power photoelectric conversion signal are realized by the transimpedance amplifying circuit.
Mould/the number conversion of transimpedance amplifying circuit output signal can according in the concrete application to the different requirements of luminous power precision of prediction, select for use high-speed a/d circuit or low speed A/D circuit to realize.
Described quick luminous power detects and the prediction and calculation method can realize on single-chip microcomputer, processor, digital signal processor spare, programmable logic device (PLD).
The detection of quick variation luminous power of the present invention and the method for prediction and calculation, can obtain importing the target power value that light changes in input light prediction and calculation of fast-changing moment, accelerate optical power detecting speed greatly, and can show fast-changing optical power value accurately.As be applied among the EDFA, can realize PUMP drive current and fast-changing input optical signal synchronously, control exactly, thereby in the gain of light of input light rapid control amplifier of fast-changing moment, the size that suppresses the gain overshoot or owe to dash effectively.In addition, quick luminous power detection of the present invention and prediction and calculation method can be directly embedded in original control flow on the basis of the cost that does not increase original digital control system in the specific implementation, realize the lifting significantly of system performance, have a good application prospect.And prediction and calculation the distortion of TIA circuit transmission begin or gear switch before very short time in carry out, the speed of calculating output is fast, and is not subjected to the influence of the factors such as distortion, vibration of TIA circuit.
Description of drawings
Fig. 1 is the detection of quick variation luminous power of the present invention and the overview flow chart of prediction and calculation method;
Fig. 2 is the block diagram of the embodiment of the detection of quick variation luminous power of the present invention and prediction and calculation method;
Fig. 3 is the processing flow chart that the characteristic parameter calibration of TIA circuit among the present invention is calculated;
Fig. 4 is the processing flow chart of the prediction and calculation of quick variation luminous power of the present invention;
Fig. 5 uses the block diagram that EDFA of the present invention (Erbium-Doped Fiber Amplifier (EDFA)) fast transient suppresses control system.
Embodiment
Below in conjunction with embodiment and accompanying drawing the detection of quick variation luminous power of the present invention and the method for prediction and calculation are made a detailed description, but the elaboration of embodiment does not herein limit the present invention.
Because characteristics of the present invention, the luminous power detection and the prediction and calculation method of many gears TIA circuit and single gear TIA circuit are identical, therefore, for conveniently understanding the present invention, except EDFA (Erbium-Doped Fiber Amplifier (EDFA)) application example, all omit the gear switch control operation about the detection of quick variation luminous power and the elaboration of prediction and calculation method in all the other embodiments and the accompanying drawing.
As shown in Figure 1, the detection of quick variation luminous power of the present invention and the method for prediction and calculation comprise the steps: S101, obtain the characteristic parameter on each gear of TIA circuit, the threshold value of instantaneous slope respectively, and deposit in these characteristic parameters and threshold value in the parameter list respectively;
S102 calculates the instantaneous slope value of TIA circuit output signal in real time, and more real-time instantaneous slope and instantaneous slope threshold value, judges whether input optical signal quick variation takes place;
S103 when input optical signal takes place to change fast, determines the initial power value that input light changes, and calculates the actual change amount of input optical power according to the instantaneous slope prediction of TIA circuit output signal;
S104, the initial luminous power that input light is changed adds the input optical power variable quantity of prediction and calculation gained, the prediction luminous power when obtaining importing light and changing fast is as the actual instantaneous power of input light;
S105, the optical power value that comparison prediction obtains and calculate the optical power value of gained according to the TIA circuit output signal, when the two near the time finish prediction and calculation, will calculate the actual instantaneous power of the optical power value of gained according to the TIA circuit output signal as input light.
Wherein, also comprise in step 1 and the step 3: change the foundation of the prediction and calculation relational expression of luminous power fast.
The prediction and calculation relational expression can clearly be represented the characteristic parameter on input optical power, each gear of TIA circuit, the relation between the TIA circuit output signal three.
The prediction and calculation relational expression of quick variation luminous power of the present invention is:
Wherein x represents the sequence number of continuous data, and i represents the gear sequence number of TIA circuit, the instantaneous slope value of K (x) expression TIA circuit output signal, and the input optical power variable quantity that Δ P (x) expression prediction and calculation obtains is a unit with the milliwatt, P
0The milliwatt value of the initial power when the expression input optical power changes, the milliwatt value of the instantaneous input optical power that prediction obtained during P (x) expression input optical power changed, M
iAnd N
iGear i characteristic of correspondence parameter group for the TIA circuit.M wherein
iAnd N
iComputing method be:
P wherein
0, P
i, Δ P
iAnd K
I, maxThe instantaneous slope maximal value of the TIA circuit output signal that the initial milliwatt value that predefined input optical power changes when representing parameter calibration respectively, termination milliwatt value, actual change amount (milliwatt value) and actual measurement obtain; I represents the gear sequence number of TIA circuit, and n is illustrated in the number of the data sample that measures under the i gear.
The foundation foundation that changes the prediction and calculation relational expression of luminous power among the present invention fast is: with the TIA circuit equivalent is the RC circuit, and according to the characteristics of RC circuit in the instantaneous slope maximum of input sudden change moment input and output signal approximately linear, sudden change moment RC circuit output signal, extract the characteristic parameter M and the N of TIA circuit respectively, the variation of the instantaneous slope of output signal by monitoring TIA circuit again, thereby the variable quantity of prediction and calculation input signal fast and accurately.
Fig. 2 is a block diagram of realizing the embodiment of the detection of quick variation luminous power of the present invention and prediction and calculation method.S201 is a photodiode, finishes opto-electronic conversion, output photodetection current signal;
S202 is the TIA circuit, is connected with photodiode, finishes I/V conversion and amplification to the opto-electronic conversion current signal respectively;
S203 is the high-speed a/d sample circuit, links to each other with the TIA circuit, realizes the output signal of TIA circuit is carried out quick sampling, and the output digital quantity uses for subsequent control;
S204 is fast-changing detection of luminous power and predictor computation module (being provided with on computers), connects the output of high-speed a/d sample circuit, realizes that the fast prediction of the target power value of fast-changing detection of input optical power and variation is calculated;
S205 is luminous power output control (by computer control), connects the output of fast-changing detection of luminous power and predictor computation module, exports normal optical power value when input optical power does not take place to change fast; Then the target light performance number of gained is calculated in the prediction of output after detecting input optical power and taking place to change fast; After the TIA circuit output signal is basicly stable, recover the normal optical power value of output;
S206 is parameter calibration module (being provided with on computers), connects the output of high-speed a/d sample circuit, realizes the characteristic parameter of TIA circuit and the calibration of instantaneous slope threshold value are calculated;
The TIA circuit feature parameter list that S207 output parameter calibration module calculates (by computing machine output).
According to shown in Figure 2, execution in step is as follows respectively under parameter calibration and the normal operating conditions:
(1) parameter calibration operation: set calibration debugging light source earlier, output rectangular modulation light signal is behind TIA circuit S202, high-speed a/d sample circuit S203, again according to high-speed a/d sample circuit S203 operation collect the data of TIA circuit output signal, execution parameter calibration module S206, calculate the characteristic parameter of TIA circuit and the positive negative threshold value of instantaneous slope, leave in the characteristic parameter table.
(2) under the normal operating conditions: from the characteristic parameter table, read parameters earlier, when the work light signal of reality through photodiode S201, after TIA circuit S202 operation converts corresponding electric signal to, carry out high-speed a/d sample circuit S203 more successively, fast-changing detection of luminous power and predictor computation module S204 realize the quick sampling to the TIA circuit output signal, fast-changing detection, the prediction and calculation of target light performance number, carry out luminous power output control S205 at last, according to judge whether the quick change procedure of TIA circuit output signal takes place and fast change procedure whether finish, whether determine the Output optical power predicted value.
Fig. 3 is the processing flow chart that the characteristic parameter calibration of TIA circuit is calculated.
Step S301, the low-power that the light signal of process rectangular modulation is set is P
L(milliwatt), the setting high power is P
H(milliwatt), obtain modulation amplitude Δ P (n) (milliwatt) (n is the sequence number of sample data, be followed successively by 1,2 ..., L);
Step S302 obtains the sampled data of the high-speed a/d of TIA circuit output signal, extracts TIA circuit feature parameter for host computer and uses;
Step S303 obtains according to sampled data and calculates instantaneous slope curve, obtains the maximal value K of instantaneous slope
Max(n);
Step S304 is with the high power P of modulated light source
HValue increases 1dBm, and repeating step S302～S304 can obtain L group { Δ P (n), K
Max(n) } data;
Step S305 and S306 according to principle of least square method, calculate characteristic parameter M, N value according to following formula fitting:
As shown in Figure 4, the processing flow chart of the prediction and calculation of the quick variation luminous power among the present invention comprises the steps:
Step S401 reads characteristic parameter M, N value and instantaneous slope threshold value K+, K-from the characteristic parameter table;
Among the present invention, instantaneous slope threshold value has positive and negative two threshold values, and when the TIA circuit output signal increased, the instantaneous slope that has only output signal just can be judged as input optical signal and increase fast greater than positive threshold value, the beginning prediction and calculation; When the TIA circuit output signal reduced, the instantaneous slope that has only output signal just can be judged as input optical signal and reduce fast less than negative threshold value, the beginning prediction and calculation.All the other situations all are judged as the constant or generation variation at a slow speed of input optical signal, can not carry out prediction and calculation.Therefore, the present invention without any negative effect, only carries out prediction and calculation to fast-changing input optical signal to normal input optical signal, is easier in the seamless control system that is integrated into current various optical transmission devices.
Among the present invention, when K (x) on the occasion of the time represent that current input optical power has the trend of increase, the amplitude that actual light power has increased equals Δ P (x) value that prediction and calculation obtains substantially, otherwise when K (x) represents that current input optical power has the trend that reduces during for negative value, the amplitude that actual light power has reduced equals Δ P (x) value that prediction and calculation obtains substantially.In the actual product accuracy of prediction and calculation only by in the production run to TIA circuit feature parameter M
iAnd N
iThe accuracy decision of calibration.Therefore, adopt the present invention and design automation to produce calibration tool, indexs such as the control accuracy of control product that can be stable and control rate.
Step S402 and S403 read the high-speed a/d sampled data, and the instantaneous slope value K (x) of real-time calculating sampling data;
Step S404, compare K (x) and K+, K (x) magnitude relationship respectively with K-, if K (x) is greater than K+ or K (x)＜K-then judge that input optical power takes place to change fast, otherwise judge the input optical power held stationary, return repeated execution of steps S402～S404;
Step S405, before the beginning prediction and calculation, record input optical power value P at this moment
0As the fast-changing initial power value of luminous power, P
0Value remained constant before the prediction and calculation processing finishes;
Step S406 preserves current instantaneous slope value K (x), and the optical power value P ' that calculates gained according to actual sample value (x), and P ' is (x) during input optical power changes fast, because the true optical power value of TIA circuit transmission distortion meeting substantial deviation reality;
Step S407, more adjacent in real time instantaneous slope value K (x) value is preserved the K of absolute value maximum
Max(x) because the TIA circuit output signal is monotone variation, if therefore with | K
Max(x) | adjacent two | K (x) | all less than | K
Max(x) |, can judge and find the maximum instantaneous slope point, this puts the moment that corresponding input optical signal is undergone mutation, and therefore, when adopting luminous power detection and prediction and calculation method, the peak response delay time of fast-changing relatively input optical signal is for searching | K
Max(x) | the peaked time;
Step S408, the target power value P (x) that changes according to formula prediction and calculation input optical power:
Wherein M, N value are to read among the step S401 to obtain P from parameter list
0It is the performance number before input light takes place to change fast;
Step S409, if find the maximal value of instantaneous slope absolute value among the step S407, then stop prediction and calculation, and keep adopting the maximum value calculation gained target power value P (x) of instantaneous slope absolute value constant, if current K (x) is not the maximal value of instantaneous slope absolute value among the S407, then the target power value P (x) of gained is calculated in the prediction of output;
Step S410, relatively P ' (x) and the relative size of P (x): | 1-P ' (x)/P (x) |＜Δ
Th, Δ wherein
ThBe the close degree between the two, can be according to the actual product target setting;
Step S411 when the S410 judged result is true, exports P ' (x), and the output of expression TIA circuit is basicly stable;
Step S412 when the S410 judged result is false, exports P (x), represents that current optical power value is a predicted value.
Fig. 5 uses the block diagram that EDFA fast transient of the present invention suppresses control system.
Among Fig. 5 quick luminous power detection and prediction and calculation method among the present invention are embedded in the control flow of conventional EDFA, comprise following steps:
Step S502～S504, the same with routine control, operations such as opto-electronic conversion, I/V conversion and the amplification of realization input detection light signal, high-speed a/d sampling;
Step S505, carry out fast-changing detection of luminous power and prediction and calculation, when input signal does not take place to change fast, this operation output valve is to calculate the gained optical power value according to TIA circuit output sampled value, when input signal takes place to change fast, output valve before the output of TIA circuit is stable is a prediction and calculation gained optical power value, and the output valve after stablizing then reverts to by TIA circuit output actual sample value and calculates the gained optical power value;
Step S506, different with conventional control method, the input gear shift control is carried out after prediction and calculation, a benefit is can calculate target power value fast before gearshift, make subsequent control to change synchronously with input substantially, another benefit is to avoid gear switch to cause the influence of TIA circuit output vibration to subsequent control;
Step S507, current value I is calculated in feedforward
p(x)=K*P (x)+B, wherein K, B are coefficient, P (x) calculates the gained optical power value for step S505, when input light changes fast, because S505 can predict the Output optical power value rapidly, exactly according to the variation of TIA circuit output signal, the control that light changes basic synchronization can be realized and import so feedforward is calculated, thereby the overshoot size can be effectively suppressed;
Step S508, PID calculates, calculate the increment size Δ I (x) of electric current according to step S505 Output optical power value and S501 output power value, when input light changes fast, because adopting S505 prediction of output optical power value to participate in PID calculates, can avoid PID control to be subjected to the influence of the distortion of TIA circuit transmission, gear switch, thereby realize the level and smooth output of current increment, disorderly problem can not occur calculating;
Step S509, total current: I (x)=I during calculating input light changes fast
p(x)+Δ I (x);
Step S510, the PUMP driving circuit amplifies I (x), drives EDFA gain of light module;
The detection of quick variation luminous power of the present invention and the method for prediction and calculation, prediction and calculation the distortion of TIA circuit transmission begin or gear switch before very short time in carry out, the speed of calculating output is fast, and is not subjected to the influence of the factors such as distortion, vibration of TIA circuit.
Above embodiment only for explaining the present invention, is not limited to the present invention, for various concrete application scenarios, may have the embodiment of various accommodations.Within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Using the present invention can finish in input light fast-changing moment the target power that changes accurately estimated calculating.The TIA circuit is on arbitrary gear, and when input optical power took place to change fast, the output signal of TIA circuit must be undergone mutation.When the instantaneous slope value of the output signal of TIA circuit instantaneous slope threshold value less than this gear correspondence, judge that current input optical power amplitude of variation is too small, perhaps the noise of TIA circuit own causes the output signal slight jitter, can not open prediction and calculation; When the instantaneous slope value of the output signal of TIA circuit instantaneous slope threshold value greater than this gear, judge that then bigger variation appears in input optical power, begin to carry out prediction and calculation, moment in the sudden change of TIA circuit output signal calculates the input optical power predicted value fast, so just can avoid because TIA circuit response distortion when input optical power changes fast causes the problem that the input optical power detecting error is big and time delay is long.After prediction obtains the input optical power value, finish prediction and calculation immediately, and the predicted value of maintenance input optical power is as the input optical power actual value, the input optical power value that calculates up to actual sample value and it by the TIA circuit output signal very near the time, just the input optical power value that will be calculated by the actual sample value of TIA circuit output signal is as the actual value of input optical power.
Use the present invention can be on finishing the target gear before the gearshift of TIA circuit corresponding luminous power estimate calculating.When one or more gear of input optical signal leap TIA circuit changes fast, prediction and calculation method of the present invention can be in the moment that input optical power changes, elder generation's prediction and calculation obtains optical power value corresponding on the target gear, and then the gear switch of carrying out the TIA circuit is operated, in the gear switch process, with the predicted value of input optical power on the current gear as input optical power actual value on the target gear and remain unchanged, input optical power value that calculates up to actual sample value and predicted value by the output signal of TIA circuit on the target gear very near the time, just the input optical power value that will be calculated by the actual sample value of the output signal of TIA circuit on the target gear is as the actual value of input optical power.Therefore, adopt the present invention not only to avoid the gearshift of TIA circuit to cause that subsequent control gets muddled preferably, and prediction and calculation speed and input optical power identical effect of quick variation in same gear.
Among the present invention, input optical power is surveyed by PD (photodiode) testing circuit and many gears TIA circuit and is realized, luminous power detection and prediction and calculation method do not have specific (special) requirements to the device of specific implementation fast, at different index requests, can select for use high-speed microprocessor, processor, DSP device, programmable logic device (PLD) etc. to be realized respectively, therefore be fit to very much the application scenario of customization.
In optical communication system, the present invention is applied in high-speed light power measurement occasion (as light power meter), can accurately calculate in real time and the display light performance number.
In Erbium-Doped Fiber Amplifier (EDFA), because the gain of EDFA is mainly determined jointly by three factors such as input optical power, pumping light power and EDFA particle inverted population level, wherein particle inverted population level increases along with the increase of pumping light power, reduces along with the increase of input optical power.When the quick variation that input optical power changes,, the gain of each optical channel is remained unchanged substantially if pumping light power can be adjusted rapidly to keep the level of particle inverted population; If it is slow that the regulating the speed obviously of pumping light power counted the pace of change of level than population inversion, then the instantaneous gain of EDFA then bigger overshoot can occur.The present invention is applied among the EDFA, can take place fast-changing moment at input optical power, prediction and calculation obtains importing the target light performance number that light changes, thereby in the shortest time, realize the feedforward calculation control, make pumping light power change synchronously with input optical power substantially, make that the change in gain of each passage is very little, overshoot is suppressed effectively.
Above embodiment only for explaining the present invention, is not limited to the present invention, for various concrete application scenarios, may have the embodiment of various accommodations.Within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind changes the detection of luminous power and the method for prediction and calculation fast, it is characterized in that, comprises the steps:
Step 1 is obtained the characteristic parameter on each gear of transimpedance amplifying circuit, the threshold value of instantaneous slope respectively, and deposits in these characteristic parameters and threshold value in the parameter list respectively;
Step 2 is calculated the instantaneous slope value of transimpedance amplifying circuit output signal in real time, and more real-time instantaneous slope and instantaneous slope threshold value, judges whether input optical signal quick variation takes place;
Step 3 when input optical signal takes place to change fast, is determined the initial power value that input light changes, and calculates the actual change amount of input optical power according to the instantaneous slope prediction of transimpedance amplifying circuit output signal;
Step 4, the initial luminous power that input light is changed adds the input optical power variable quantity of prediction and calculation gained, the prediction luminous power when obtaining importing light and changing fast is as the actual instantaneous power of input light;
Step 5, the optical power value that comparison prediction obtains and calculate the optical power value of gained according to transimpedance amplifying circuit output signal, when the two near the time finish prediction and calculation, the actual instantaneous power of importing light this moment equals to calculate according to transimpedance amplifying circuit output signal the optical power value of gained.
2. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation, it is characterized in that, if the absolute value of the instantaneous slope of transimpedance amplifying circuit output signal is then carried out the prediction and calculation of input optical power greater than instantaneous slope threshold value, comprise following treatment step:
Step S405, the input optical power value P before the start-of-record prediction and calculation
0As the fast-changing initial power value of luminous power;
Step S406 preserves current instantaneous slope value K (x), and the optical power value P ' that calculates gained according to actual sample value is (x), wherein x=0,1,2 ..., be that sampling is calculated constantly;
Step S407, more adjacent in real time instantaneous slope value K (x) is worth, and finds the instantaneous slope value K of absolute value maximum
Max(x);
Step S408, the target power value P (x) that the prediction and calculation input optical power changes;
Step S409 is if find the instantaneous slope value K of absolute value maximum among the step S407
Max(x), then stop prediction and calculation, and keep adopting the maximum value calculation gained target power value P (x) of instantaneous slope absolute value constant, if current instantaneous slope value K (x) is not the maximal value of instantaneous slope absolute value among the step S407, then the target power value P (x) of gained is calculated in the prediction of output;
Step S410 judges that whether optical power value P ' value (x) is near target power value P (x);
Step S411 and step S412, when optical power value P ' (x) with the size of target power value P (x) very near the time, Output optical power value P ' (x), the output of expression transimpedance amplifying circuit is basicly stable, when optical power value P ' (x) with the size differences of target power value P (x) when big, export target performance number P (x) represents the current prediction and calculation of carrying out.
3. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation, it is characterized in that, if the absolute value of the instantaneous slope of transimpedance amplifying circuit output signal is not more than instantaneous slope threshold value, then directly calculate the input optical power value according to transimpedance amplifying circuit output signal.
4. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation is characterized in that, also comprise in described step 1 and the step 3: change the foundation of the prediction and calculation relational expression of luminous power fast.
5. the detection of quick variation luminous power according to claim 4 and the method for prediction and calculation, it is characterized in that, the prediction and calculation relational expression that changes fast luminous power be with the equivalence of transimpedance amplifying circuit on the basis of RC circuit model, and utilize the characteristics of RC circuit output signal absolute value maximum of the instantaneous slope of correspondence when input signal takes place to change fast to set up.
6. the detection of quick variation luminous power according to claim 4 and the method for prediction and calculation is characterized in that, the prediction and calculation relational expression that changes luminous power fast is:
Wherein x represents the sequence number of continuous data, and i represents the gear sequence number of transimpedance amplifying circuit, the instantaneous slope value of K (x) expression transimpedance amplifying circuit output signal, and the input optical power variable quantity that Δ P (x) expression prediction and calculation obtains is a unit with the milliwatt, P
0The milliwatt value of the initial power when the expression input optical power changes, the milliwatt value of the instantaneous input optical power that prediction obtained during P (x) expression input optical power changed, M
iAnd N
iGear i characteristic of correspondence parameter group for the transimpedance amplifying circuit.
7. the detection of quick variation luminous power according to claim 6 and the method for prediction and calculation is characterized in that, change the parameter M in the prediction and calculation relational expression of luminous power fast
iAnd N
iComputing method be:
P wherein
0, P
i, Δ P
iAnd K
I, maxThe initial milliwatt value that predefined input optical power changes when representing parameter calibration respectively, termination milliwatt value, actual change amount milliwatt value, and the instantaneous slope maximal value of surveying the transimpedance amplifying circuit output signal that obtains; I represents the gear sequence number of transimpedance amplifying circuit, and n is illustrated in the number of the data sample that measures under the i gear.
8. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation is characterized in that, the I/V conversion and the amplifying circuit of input optical power photoelectric conversion signal are realized by the transimpedance amplifying circuit.
9. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation, it is characterized in that, mould/the number conversion of transimpedance amplifying circuit output signal can according in the concrete application to the different requirements of luminous power precision of prediction, select for use high-speed a/d circuit or low speed A/D circuit to realize.
10. the detection of quick variation luminous power according to claim 1 and the method for prediction and calculation, it is characterized in that described quick luminous power detects and the prediction and calculation method can realize on single-chip microcomputer, processor, digital signal processor spare, programmable logic device (PLD).
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| CN102610996B (en) * | 2012-01-19 | 2014-05-14 | 厦门优迅高速芯片有限公司 | Method and device for rapidly calibrating luminous power |
| CN102546013B (en) | 2012-02-17 | 2014-08-13 | 华为技术有限公司 | Signal power detection method and equipment |
| CN103780303B (en) | 2012-10-24 | 2017-07-25 | 华为技术有限公司 | Optical module and its detection circuit |
| CN104734784B (en) * | 2013-12-19 | 2017-12-22 | 华为技术有限公司 | A kind of method and apparatus for determining input optical power |
| CN106772595A (en) * | 2016-12-05 | 2017-05-31 | 中国矿业大学 | A kind of method that detonator time delay is eliminated in shock wave Velocity Inversion for colliery |
| CN109495182B (en) * | 2018-10-16 | 2020-07-31 | 武汉光迅科技股份有限公司 | Receiving end calibration method and device of coherent optical module |
| CN110730040B (en) * | 2019-11-19 | 2024-03-29 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN115441945A (en) * | 2022-08-19 | 2022-12-06 | 武汉邮电科学研究院有限公司 | Optical power prediction method and device |
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