CN101877572A - Device and method for high-speed automatic gain control - Google Patents
Device and method for high-speed automatic gain control Download PDFInfo
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- CN101877572A CN101877572A CN2009101071338A CN200910107133A CN101877572A CN 101877572 A CN101877572 A CN 101877572A CN 2009101071338 A CN2009101071338 A CN 2009101071338A CN 200910107133 A CN200910107133 A CN 200910107133A CN 101877572 A CN101877572 A CN 101877572A
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Abstract
The invention relates to the field of amplifiers, and in particular discloses a device and a method for high-speed automatic gain control. The device comprises a feedforward control part and a feedback control part, wherein in the feedforward control part, an input optical signal and a pumping current form a linear relationship, the input optical signal is detected and amplified by an operational amplifier, a control signal is directed loaded to a pumping to generate a corresponding pumping drive current; and in the feedback control part, a product of the input optical signal and a gain target value is compared with an output optical signal by detecting the input optical signal and the output optical signal to obtain a difference between the output optical signal and the target value, the difference between the output optical signal and the target value is input to a proportional integral differential (PID) circuit to output the control signal so as to control the drive current of the pumping, and the final control result is generated by adding the output result of a feedforward circuit and the output result of a feedback circuit by an adder to output the final control signal so as to control a pumping laser device. Therefore, the invention provides the control device and the method having the advantages of high speed, low power consumption and low cost.
Description
Technical field
The present invention relates to a kind of being applied in and control the control method of (AGC) function by the combine automatic gain of the high speed that realizes of feedforward and rear feed in the doped optical fibre amplifier.
Background technology
The current quick A GC controlled function that realizes in the doped optical fibre amplifier module generally mainly contains following two kinds of schemes: based on FEEDBACK CONTROL scheme behind the digital control scheme of processor control, the hardware circuit, below various schemes are done one and simply introduce:
Digital control scheme based on processor control, it is flexible, convenient that this on the whole scheme is used, this scheme generally all will be used with ADC (analog to digital converter) and DAC (digital to analog converter) at a high speed, draws the result who needs after need calculating in processor.Generally, these device power consumption at a high speed all can be very big, generally all in the hundreds of milliwatt even more than several watts, the overall power of amplifier module is increased, and be the epoch of main flow at current communication products with low cost, low-power consumption, small size, high power consumption just has very big drawback.
FEEDBACK CONTROL scheme behind the hardware circuit, cost is minimum, but this scheme mainly is to control pumping current by the feedback result of optical input power and optical output power, general thisly only come the scheme speed of ride gain can be slow, because comprised the time course of an integration and differential in the circuit by the mode of back feedback.
Summary of the invention
The present invention proposes a kind of apparatus and method of High-Speed Automatic gain controlling, i.e. the controlling schemes that feed forward circuit control and back feedback circuit control combine provides a kind of high speed, low-power consumption, control device and method cheaply.
To achieve these goals, the present invention proposes a kind of method of High-Speed Automatic gain controlling, it is characterized in that: comprise feedfoward control part and back FEEDBACK CONTROL part, the feedfoward control part, input optical signal and pumping current are linear, input optical signal detects, amplifies by operational amplifier, control signal directly is loaded into produces corresponding Pump Drive current in the pumping; The rear feed control section, compare by detecting input optical signal and exporting light signal, draw the error between output light signal and the desired value, then the error between them is input to proportion integration differentiation (PID) circuit output control signal, the drive current of control pumping, final control result controls pump laser by the output result of feed forward circuit and the output result of rear feed circuit by the final control signal of adder output, realizes Amplifier Gain control.
Wherein, preferred version is that the output result of described feedfoward control part is directly determined by the size of input optical signal.
Wherein, preferred version is that the output result of described back FEEDBACK CONTROL part is by input optical signal and the decision of output light signal error comparative result.
Wherein, preferred version is,: the job step of feedfoward control part comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 obtains output voltage V 2 through input proportional amplifier amplification target gain multiple G; Second step: regulate the adjustable voltage biasing circuit and make that the output voltage of this circuit is B1; The 3rd step: the output voltage V 2 of input proportional amplifier and the output voltage B1 of adjustable voltage biasing circuit are input to adder simultaneously, obtain the voltage V6 of adder output; The 4th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, the job step of rear feed control section comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains output voltage V 2; Second step: output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier again; The 3rd step: the voltage V2 of input proportional amplifier output and output transreactance amplifier convert voltage V3 to and are input to the proportion integration differentiation circuit simultaneously, and what obtain the proportion integration differentiation circuit goes out voltage V5; The 4th step: the output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The 7th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser.
Wherein, preferred version is, the job step of rear feed control section comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains output voltage V 2; Second step: output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier again; The 3rd step: regulate ASE compensating circuit output voltage B2; The 4th step: the voltage V3 of output transreactance amplifier output and the output voltage B2 of ASE compensating circuit are input to the output subtraction circuit simultaneously, obtain the output voltage V 4 of subtracter; The 5th step: the voltage V4 of the voltage V2 of input proportional amplifier output and the output of output subtracter is input to the proportion integration differentiation circuit simultaneously, and what obtain the proportion integration differentiation circuit goes out voltage V5; The 6th step: the output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The 7th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser.
Wherein, preferred version is, the driving current signal that described rear feed control section is a pump laser is by the ratio multiple decision of input photodiode signal and output photodiode signal, and input photodiode signal and output photodiode signal are by realizing Amplifier Gain control through the proportion integration differentiation circuit behind the transreactance amplifier.
Wherein, preferred version is, the result that described feedforward control circuit and rear feed control circuit draw by the adder circuit addition is as the final control signal of control pump laser.
Wherein, preferred version is that described proportion integration differentiation circuit can be ignored the differential circuit part.
The present invention also comprises a kind of device of High-Speed Automatic gain controlling, it is characterized in that: described feedfoward control part and rear feed control section, the result that the output result of described feedforward control circuit part and the output result of rear feed control section draw by an adder addition is as the final control signal of controlling pump laser.
Wherein, preferred version is described feedfoward control part input photodiode, input transreactance amplifier, input proportional amplifier, adjustable bias potential circuit, adder, drive circuit for laser, pump laser.The annexation of feedforward is: the fraction light signal enters the input photodiode, produces corresponding photoelectric current I1, and this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Regulate the adjustable voltage biasing circuit and make that the output voltage of this circuit is B1; The output voltage V 2 of input proportional amplifier and the output voltage B1 of adjustable voltage biasing circuit are input to adder simultaneously, obtain the voltage V6 of adder output; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
Wherein, preferred version is, described input transreactance amplifier, and the input proportional amplifier, the adjustable bias potential circuit, adder, drive circuit for laser constitute by high speed operation amplifier.
Wherein, preferred version is that the multiplication factor G of input proportional amplifier is the overall gain of system, can carry out the multiple setting by adjustable resistance, also can carry out the multiple setting by digital regulation resistance.
Wherein, preferred version is, the rear feed circuit part comprises: input photodiode, input transreactance amplifier, input proportional amplifier, output photodiode, output transreactance amplifier, proportion integration differentiation circuit, adder, drive circuit for laser, pump laser, the annexation of rear feed is: light signal enters the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; The voltage V2 of the voltage V3 of output transreactance amplifier output and the output of input proportional amplifier is input to the proportion integration differentiation circuit simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit; The output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
Wherein, preferred version is that the rear feed circuit part comprises: input photodiode, input transreactance amplifier, input proportional amplifier, output photodiode, output transreactance amplifier, ASE compensating circuit, output subtracter, proportion integration differentiation circuit, adder, drive circuit for laser, pump laser.The annexation of rear feed is: light signal enters the input photodiode, produces corresponding photoelectric current I1, and this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; Regulate ASE compensating circuit output voltage B2; The voltage V3 of output transreactance amplifier output and the output voltage B2 of ASE compensating circuit are input to the output subtraction circuit simultaneously, obtain the output voltage V 4 of subtracter; The voltage V4 of the voltage V2 of input proportional amplifier output and the output of output subtracter is input to the proportion integration differentiation circuit simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit; The output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
Wherein, preferred version is that input transreactance amplifier, input proportional amplifier, output photodiode, output transreactance amplifier, ASE compensating circuit, output subtracter, proportion integration differentiation circuit, adder, drive circuit for laser constitute by high speed operation amplifier.
Wherein, preferred version is, the described circuit that is made of operational amplifier can a single power supply or dual power supply.
The invention has the advantages that: because the control method that combines by above-mentioned feedforward and rear feed is exactly the control result that will feedover and the control results added of rear feed in fact, and then the final voltage that adder draws controlled laser by drive circuit for laser, have advantages such as at a high speed, low-power consumption, low cost.
Description of drawings
Below in conjunction with accompanying drawing implementation method of the present invention is further specified:
Fig. 1 represents the structure principle chart of first embodiment of the device of a kind of High-Speed Automatic gain controlling of the present invention.
Fig. 2 represents the structure principle chart of second embodiment of the device of a kind of High-Speed Automatic gain controlling of the present invention.
Embodiment
Below in conjunction with accompanying drawing effect of the present invention being described further, is its embodiment with erbium-doped fiber amplifier especially.
As shown in Figure 1, wherein, fiber amplifier among described Fig. 1 (EDFA) light channel structure 20 comprises main body light path 23, output optical splitter 24, the output wire jumper 25 of input wire jumper 21, amplifier.Transmit from left to right referring to accompanying drawing 1 direction of propagation of light signal.
Wherein, the function of each device of described light path part is as follows: input optical splitter 22, input optical signal enters input optical splitter 22 by input wire jumper 21, input optical splitter 22 will be imported the light separated into two parts, part light is walked the main body light path 23 that main optical path enters amplifier, another part light enters input photodiode 31 by the input optical splitter, plays supervisory function bit; Input light amplifies back output light signal through the main body light path 23 of amplifier, enter output optical splitter 24: with output signal light separated into two parts, part light is walked wire jumper 25 outputs of main optical path from output, the beam split of another part light process output is opened and is entered output photodiode 32, plays supervisory function bit.
Wherein, the controlling schemes that feedfoward control and back FEEDBACK CONTROL combine comprises feedfoward control part 30 and rear feed control section 40, feedfoward control part 30 comprises: input photodiode 31, input transreactance amplifier 32, input proportional amplifier 33, adjustable bias potential circuit 36, adder 35, drive circuit for laser 34, pump laser 29; Rear feed circuit part 40 comprises: input photodiode 31, input transreactance amplifier 32, input proportional amplifier 33, output photodiode 41, output transreactance amplifier 42, proportion integration differentiation circuit 45, adder 35, drive circuit for laser 34, pump laser 29; The shared part of feed forward circuit and rear feed circuit is: input photodiode 31, input transreactance amplifier 32, input proportional amplifier 33, adder 35, drive circuit for laser 34, pump laser 29, wherein, the light path of described feedfoward control part 30 is: the fraction light signal enters input photodiode 31, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through input transreactance amplifier 32 again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Regulate adjustable voltage biasing circuit 36 and make that the output voltage of this circuit is B1; The output voltage V 2 of input proportional amplifier 33 and the output voltage B1 of adjustable voltage biasing circuit 36 are input to adder 35 simultaneously, obtain the voltage V6 of adder 35 outputs; The output voltage V 6 of adder 35 is input to drive circuit for laser 34, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path 20 under the effect of this electric current.The light path of rear feed control section 40 is: input light through input optical splitter 22 minutes the sub-fraction light signal enters input photodiode 31, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through input transreactance amplifier 32 again, and this voltage V1 amplifies G through input proportional amplifier 33 and doubly obtains V2; Output light through output optical splitter 24 minutes the sub-fraction light signal enters output photodiode 41, produce corresponding photoelectric current I2, this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; The voltage V2 of the voltage V3 of output transreactance amplifier 42 outputs and 33 outputs of input proportional amplifier is input to proportion integration differentiation circuit 45 simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit 45; The output voltage V 5 of proportion integration differentiation circuit 45 obtains the output voltage V 6 of adder 35 through adder 35; The output voltage V 6 of adder 35 is input to drive circuit for laser 34, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser 29, laser produces corresponding light signal and is loaded in the light path 20 under the effect of this electric current.
Wherein, preferred version, described input transreactance amplifier 32, input proportional amplifier 33, adjustable bias circuit 36, output transreactance amplifier 42, output subtracter 44, proportion integration differentiation circuit 45, adder 35, drive circuit for laser 34 constitute by high speed operation amplifier.
Wherein, preferred version, the output result of described feedfoward control part 30 is directly determined by the size of input optical signal.
Wherein, preferred version, the multiplication factor G of the input proportional amplifier of described feedfoward control part 30 is overall gain values of light path system.
Wherein, preferred version, the multiplication factor G of the input proportional amplifier of described feedfoward control part 30 can be by adjustable resistance or digital regulation resistance setting.
For stabilizing circuit, the differential partial circuit in the proportion integration differentiation circuit 45 of the output light part of described back FEEDBACK CONTROL part 40 can be ignored.
Wherein, preferred version, described adder 35, but proportion integration differentiation circuit 45 single power supplies or dual power supply.
Fig. 2 is the structure principle chart of second embodiment of the device of a kind of High-Speed Automatic gain controlling of the present invention, carries out the ASE compensation when small-signal is imported.
As shown in Figure 2: feedfoward control part and embodiment one are as broad as long, mainly are that the rear feed control section has increased the ASE compensated part.Rear feed circuit part 40 comprises: input photodiode 31, input transreactance amplifier 32, input proportional amplifier 33, output photodiode 41, output transreactance amplifier 42, ASE compensating circuit 43, output subtracter 44, proportion integration differentiation circuit 45, adder 35, drive circuit for laser 34, pump laser 29, the light path of rear feed control section 40 is: input light through input optical splitter 22 minutes the sub-fraction light signal enters input photodiode 31, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through input transreactance amplifier 32 again, and this voltage V1 amplifies G through input proportional amplifier 33 and doubly obtains V2; Output light through output optical splitter 24 minutes the sub-fraction light signal enters output photodiode 41, produce corresponding photoelectric current I2, this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; Regulate ASE compensating circuit 43 output voltage B2; The voltage V3 of output transreactance amplifier 42 outputs and the output voltage B2 of ASE compensating circuit 43 are input to output subtracter 44 simultaneously, obtain the output voltage V 4 of subtracter; The voltage V4 of the voltage V2 of input proportional amplifier 33 outputs and 44 outputs of output subtracter is input to proportion integration differentiation circuit 45 simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit 45; The output voltage V 5 of proportion integration differentiation circuit 45 obtains the output voltage V 6 of adder 35 through adder 35; The output voltage V 6 of adder 35 is input to drive circuit for laser 34, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser 29, laser produces corresponding light signal and is loaded in the light path 20 under the effect of this electric current.
Wherein, preferred version, described input transreactance amplifier 32, input proportional amplifier 33, adjustable bias circuit 36, output transreactance amplifier 42, ASE compensating circuit 43, output subtracter 44, proportion integration differentiation circuit 45, adder 35, drive circuit for laser 34 constitute by high speed operation amplifier.
For stabilizing circuit, the differential partial circuit in the proportion integration differentiation circuit 45 of the output light part of described back FEEDBACK CONTROL part 40 can be ignored.
Wherein, preferred version, the output result of described feedfoward control part 30 and the output result of rear feed control section 40 export to pump laser by adder 35.
Wherein, preferred version, described adder 35, but proportion integration differentiation circuit 45 single power supplies or dual power supply.
The present invention also comprises a kind of method of High-Speed Automatic gain controlling, and in order to describe the course of work of this method in detail, the present invention carries out progressively reasoning by the common-used formula of this area.
The basic principle of described feedfoward control part 30 is as follows:
Wherein, under the constant prerequisite of the gain of light, power output and input power are proportional, and just pumping current that can draw and input optical power have following relation:
I＝K×Pin(mW)+B-----------------------------(1)
(1) Pin (mW) is a slope for input optical power (is unit with milliwatt (mW)) K in the formula, and I is a pumping current, and B is an intercept; Wherein, K, B value are the fundamental characteristics of light path, can be come out by the calculation of design parameters of light path, are not described in detail here.
Above-mentioned formula is the most basic foundation that realizes feedfoward control, the feedfoward control part 30 of accompanying drawing 1.
The operation principle of present embodiment feedfoward control part 30 is exactly in order to realize formula (1), the most important link that realizes formula (1) is exactly to determine the feedback resistance value R1 of input transreactance amplifier, at first import light and enter input photodiode 31 by input optical splitter 22, the electric current of input photodiode 31 generations converts voltage V1 to by input transreactance amplifier 32 then, the voltage V1 that produces on the transreactance amplifier 32 obtains voltage V2 after amplifying G times by input proportional amplifier 33, V2 converts corresponding Pump Drive current I to by the pumping drive circuit again, can draw Pump Drive current I by the principle of operational amplifier:
I＝G×R1×(a％×η)×Pin(mW)---------------(2)
(2) in the formula, V1 is the output voltage of transreactance amplifier 32, R1 is the feedback resistance on the transreactance amplifier 32, Pin (mW) is input optical power (is unit with milliwatt (mW)), a% is the splitting ratio of input optical splitter 22, and promptly importing light has the ratio of a% to enter into input photodiode 31, and η is the responsiveness of photodiode, general this value is defaulted as 1, the yield value that multiple G needs for the light path module.
Wherein, the adjustable bias circuit 36 of the feed forward circuit part 30 in the accompanying drawing 1 is B1=B by adjustable resistance or digital regulation resistance regulation voltage, then in accompanying drawing 1 as can be seen, feedfoward control part 30 by the electric current I that pump driver produces is:
I＝G×R1×(a％×η)×Pin(mW)+B----------(3)
Can draw by (1), (3):
K＝G×R1×(a％×η)-------------------(4)
By (4) formula can calculate input transreactance amplifier 32 feedback resistance R1=K/ (a% * η * G), determined the feedback resistance R1 of input transreactance amplifier 32 after, the feedfoward control part 30 of this embodiment is just finished.But because this control belongs to open loop control, thus on control precision, have certain deviation, thus need the back feedback control circuit to compensate, thus reach precision control requirement.
The operation principle of present embodiment rear feed control is similar substantially to the feedback control principle that industry is used always, and when ignoring the ASE compensation, the output end signal of control is total Output optical power; When needs carried out the ASE compensation, the output end signal of control was the signal power of output light, and example is compensated for as example to ignore ASE, and main process is as follows:
Input optical signal is input to input photodiode 31 by input optical splitter 22, amplifies through input transreactance amplifier 32 to produce voltage V1 again, and V1 amplifies G times of output voltage V 2 by the input proportional amplifier; The output light signal is input to output photodiode 41 by output optical splitter 24, amplifies through output transreactance amplifier 42 to produce voltage V3 again.
Wherein, because the feedback resistance R1 of fixed input transreactance amplifier makes R1 * a% * η=R2 * b% * η also just determine the feedback resistance R2 of output transreactance amplifier:
R2＝R1×a％/b％ ---------------------(5)
Principle according to the output transreactance amplifier can draw:
V3＝R2×(Pout(mW)×b％×η) --------------(6)
(6) in the formula, R is the feedback resistance of output transreactance amplifier 42, Ppump (mW) is the power output of pumping (is unit with milliwatt (mW)), b% is the splitting ratio of output optical splitter, promptly exporting light has the ratio of b% to enter into the output photodiode, η is the responsiveness of photodiode, and generally this value is defaulted as 1.
Wherein, after input optical signal process input transreactance amplifier 32 and input proportional amplifier 33 output voltage V 2 and output light signal process output transreactance amplifier 42 and output subtracter 44 output voltage V 4 (ignoring the ASE compensation), pass through proportion integration differentiation circuit 45 and adder 35 again, produce the driving voltage V6 of control pump laser, V6 converts corresponding Pump Drive current I to by pumping drive circuit 34.
Because V2, V4 are input to forward and reverse input of linear operational amplifier respectively, can get according to the principle of operational amplifier:
Pout(mW)＝G×Pin(mW) ------------------------(7)
By (7) formula as can be seen power output be input power G doubly, the back FEEDBACK CONTROL of this embodiment is just finished.
The control result of complex feed-back, rear feed can draw the voltage V6 that is added in pump driver 34 ends and is:
V6＝V2+V5+B -----------------------------(8)
V6 converts corresponding Pump Drive current I to by pumping drive circuit 34, the final actual electric current that is added on the pump laser 29 of this electric current I conduct, the Pump Drive current when just being G for satisfied gain.
Above each several part is comprehensive, and the control method that above-mentioned feedforward and rear feed combine is exactly the control result that will feedover and the control results added of rear feed in fact, and then the final voltage that adder 35 draws is controlled laser by drive circuit for laser.
The invention has the advantages that: the apparatus and method that the present invention proposes a kind of High-Speed Automatic gain controlling, it is the controlling schemes that feed forward circuit control and back feedback circuit control combine, a kind of high speed is provided, low-power consumption, control method cheaply, be that the The whole control circuit is divided into feedfoward control and back FEEDBACK CONTROL two parts, feedfoward control guarantees the rate request of circuit response, rear feed control guarantees the corresponding required precision of circuit, so feedfoward control and rear feed control combine and satisfied rate request has satisfied required precision again, can realize low-power consumption again simultaneously, low-cost.
The above person only is most preferred embodiment of the present invention, is not to be used to limit the scope of the invention, and all equivalences of being done according to the present patent application claim change or modify, and are all the present invention and contain.
Claims (16)
1. the method for a High-Speed Automatic gain controlling, it is characterized in that: comprise feedfoward control part and back FEEDBACK CONTROL part, the feedfoward control part, input optical signal and pumping current are linear, input optical signal detects, amplifies by operational amplifier, control signal directly is loaded into produces corresponding Pump Drive current in the pumping; The rear feed control section, by detecting input optical signal and output light signal, product to input optical signal and gain target value compares with the output light signal, draw the error between output light signal and the desired value, then the error between them is input to proportion integration differentiation circuit output control signal, the drive current of control pumping, final control result controls pump laser by the output result of feed forward circuit and the output result of rear feed circuit by the final control signal of adder output, realizes Amplifier Gain control.
2. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 1, it is characterized in that: the output result of described feedfoward control part is directly determined by the size of input optical signal.
3. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 1, it is characterized in that: the output result of described back FEEDBACK CONTROL part multiply by gain target value and the decision of output light signal error comparative result by input optical signal.
4. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 1, it is characterized in that: the job step of feedfoward control part comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 obtains output voltage V 2 through input proportional amplifier amplification target gain multiple G; Second step: regulate the adjustable voltage biasing circuit and make that the output voltage of this circuit is B1; The 3rd step: the output voltage V 2 of input proportional amplifier and the output voltage B1 of adjustable voltage biasing circuit are input to adder simultaneously, obtain the voltage V6 of adder output; The 4th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, the job step of rear feed control section comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains output voltage V 2; Second step: output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier again; The 3rd step: the voltage V2 of input proportional amplifier output and output transreactance amplifier convert voltage V3 to and are input to the proportion integration differentiation circuit simultaneously, and what obtain the proportion integration differentiation circuit goes out voltage V5; The 4th step: the output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The 7th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser.
5. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 4, it is characterized in that: the job step of rear feed control section comprises: the first step: input light is got the sub-fraction light signal through the input optical splitter and is entered the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains output voltage V 2; Second step: output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier again; The 3rd step: regulate ASE compensating circuit output voltage B2; The 4th step: the voltage V3 of output transreactance amplifier output and the output voltage B2 of ASE compensating circuit are input to the output subtraction circuit simultaneously, obtain the output voltage V 4 of subtracter; The 5th step: the voltage V4 of the voltage V2 of input proportional amplifier output and the output of output subtracter is input to the proportion integration differentiation circuit simultaneously, and what obtain the proportion integration differentiation circuit goes out voltage V5; The 6th step: the output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The 7th step: the output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser.
6. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 4, it is characterized in that: the driving current signal that described rear feed control section is a pump laser is by the ratio multiple decision of input photodiode signal and output photodiode signal, and input photodiode signal and output photodiode signal are by realizing Amplifier Gain control through the proportion integration differentiation circuit behind the transreactance amplifier.
7. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 4, it is characterized in that: the result that described feedforward control circuit and rear feed control circuit draw by the adder circuit addition is as the final control signal of control pump laser.
8. according to the method for the described a kind of High-Speed Automatic gain controlling of claim 4, it is characterized in that: described proportion integration differentiation circuit can be ignored the differential circuit part.
9. the device of a High-Speed Automatic gain controlling, it is characterized in that: described feedfoward control part and rear feed control section, the result that the output result of described feedforward control circuit part and the output result of rear feed control section draw by an adder addition is as the final control signal of controlling pump laser.
10. according to the device of the described a kind of High-Speed Automatic gain controlling of claim 9, it is characterized in that: described feedfoward control part input photodiode, input transreactance amplifier, input proportional amplifier, the adjustable bias potential circuit, adder, drive circuit for laser, pump laser.The annexation of feedforward is: the fraction light signal enters the input photodiode, produces corresponding photoelectric current I1, and this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Regulate the adjustable voltage biasing circuit and make that the output voltage of this circuit is B1; The output voltage V 2 of input proportional amplifier and the output voltage B1 of adjustable voltage biasing circuit are input to adder simultaneously, obtain the voltage V6 of adder output; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
11. device according to the described a kind of High-Speed Automatic gain controlling of claim 10, it is characterized in that: described input transreactance amplifier, the input proportional amplifier, the adjustable bias potential circuit, adder, drive circuit for laser constitute by high speed operation amplifier.
12. the device according to the described a kind of High-Speed Automatic gain controlling of claim 10 is characterized in that: the multiplication factor G of input proportional amplifier is the overall gain of system, can carry out the multiple setting by adjustable resistance, also can carry out the multiple setting by digital regulation resistance.
13. device according to the described a kind of High-Speed Automatic gain controlling of claim 9, it is characterized in that: the rear feed circuit part comprises: the input photodiode, the input transreactance amplifier, the input proportional amplifier, the output photodiode, the output transreactance amplifier, the proportion integration differentiation circuit, adder, drive circuit for laser, pump laser, the annexation of rear feed is: light signal enters the input photodiode, produce corresponding photoelectric current I1, this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; The voltage V2 of the voltage V3 of output transreactance amplifier output and the output of input proportional amplifier is input to the proportion integration differentiation circuit simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit; The output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
14. the device according to the described a kind of High-Speed Automatic gain controlling of claim 13 is characterized in that: the rear feed circuit part comprises: input photodiode, input transreactance amplifier, input proportional amplifier, output photodiode, output transreactance amplifier, ASE compensating circuit, output subtracter, proportion integration differentiation circuit, adder, drive circuit for laser, pump laser.The annexation of rear feed is: light signal enters the input photodiode, produces corresponding photoelectric current I1, and this photoelectric current I1 converts voltage V1 to through the input transreactance amplifier again, and this voltage V1 amplifies G through the input proportional amplifier and doubly obtains V2; Output light is got the sub-fraction light signal through the output optical splitter and is entered the output photodiode, produces corresponding photoelectric current I2, and this photoelectric current I2 converts voltage V3 to through the output transreactance amplifier; Regulate ASE compensating circuit output voltage B2; The voltage V3 of output transreactance amplifier output and the output voltage B2 of ASE compensating circuit are input to the output subtraction circuit simultaneously, obtain the output voltage V 4 of subtracter; The voltage V4 of the voltage V2 of input proportional amplifier output and the output of output subtracter is input to the proportion integration differentiation circuit simultaneously, obtains the output voltage V 5 of proportion integration differentiation circuit; The output voltage V 5 of proportion integration differentiation circuit obtains the output voltage V 6 of adder through adder; The output voltage V 6 of adder is input to drive circuit for laser, should control voltage V6 and convert the corresponding driving electric current to, and this electric current is loaded on the laser, and laser produces corresponding light signal and is loaded in the light path under the effect of this electric current.
15. the device according to claim 13 or 14 described a kind of High-Speed Automatic gain controlling is characterized in that: input transreactance amplifier, input proportional amplifier, output photodiode, output transreactance amplifier, ASE compensating circuit, output subtracter, proportion integration differentiation circuit, adder, drive circuit for laser constitute by high speed operation amplifier.
16. the device according to claim 13 or 14 described a kind of High-Speed Automatic gain controlling is characterized in that: the described circuit that is made of operational amplifier can a single power supply or dual power supply.
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| CN105912067B (en) * | 2016-06-15 | 2017-05-24 | 凌云天博光电科技股份有限公司 | Control method and device for pump laser input currents |
| CN108390720A (en) * | 2017-02-03 | 2018-08-10 | 宏观微电子股份有限公司 | Semiconductor chip |
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