CN103401139B - Laser monitoring power sampling circuit and method suitable for continuous and burst modes - Google Patents
Laser monitoring power sampling circuit and method suitable for continuous and burst modes Download PDFInfo
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Abstract
The invention discloses a laser monitoring power sampling circuit and a laser monitoring power sampling method suitable for continuous and burst modes, relating to the field of lasers. The circuit comprises a power supply, a reference voltage, an input sampling voltage, an operational amplifier, a filter resistor, a capacitor, a filtering voltage, a first resistor, a second resistor, a first NMOS (N-channel Metal Oxide Semiconductor) tube, a second NMOS tube, a first switch, a second switch, a third switch, a fourth switch and a fifth switch. The sampling circuit is controlled through a time-sequence signal and a burst enable signal, the photoelectric current of a monitoring diode is sampled and filtered, sampling circuits in the continuous mode and the burst mode are combined into one, and the same set of sampling circuit can be adopted for processing no matter the laser works in the continuous mode or the burst mode, so that the aims of sampling and processing respectively is fulfilled through the time sequences of different modes, and the continuous mode and the burst mode can work normally.
Description
Technical field
The present invention relates to field of lasers, particularly relate to a kind of to be suitable for continuously and the laser of burst mode monitors luminous power sample circuit and method.
Background technology
Laser comprises one and sends the LD(Laser Diode of data, laser diode) and a MD(Monitor Diode carrying out power monitoring, photodiode).The luminescence of laser diode LD needs a threshold current I
tH, when the electric current being supplied to laser diode LD is greater than or equal to threshold current I
tHtime, laser diode LD just converts electrical signals to light signal, thus carries out high-speed optical signal transmission.
LDD(Laser Diode Driver, laser diode drive) for laser diode LD provides drive current, be described above the characteristics of luminescence of laser, the electric current being supplied to laser needs to be greater than threshold current I
tHcould be luminous, so the electric current that laser diode drive LDD is supplied to laser diode LD has two kinds, one is quiescent bias current I
bIAS, another is passed through by a pair data differential signals DINP, DNIN to amplify the modulated current I that shaping outputs to laser
mOD, these two kinds of electric currents can be supplied to laser diode LD simultaneously.
Because the light output characteristic of laser diode LD is very strong to the dependence of temperature, and delivery efficiency reduces along with the aging of laser diode LD.So the luminous power of laser diode LD and quiescent bias current I
bIASthere are much relations, laser works be made in optimum state, be supplied to the quiescent bias current I of laser diode LD
bIASalso need to revise at any time.In order to ensure the constant of laser diode LD Output optical power, all contain an APC(Auto Power Control in laser diode drive LDD chip, Automatic optical power control) circuit.
Shown in Figure 1, APC loop in laser diode drive LDD chip is by DSP(Digital Signal Processor, digital signal processor) control, photodiode MD senses the light that laser diode LD sends, and produces monitoring current I according to certain proportionate relationship
mD, this monitoring current I
mDwith the luminous power direct proportional linear relation of laser diode LD.Monitoring current I
mDvery little with the relation of temperature and degree of aging, utilize the resistance R of photodiode MD
mDsampling, by monitoring current I
mDbe converted to sampled voltage Vmd, in order to make comparator CMP export a stable state, sampled voltage Vmd needs to process after filtering.So there is a low-pass filter circuit after sampled voltage Vmd, the voltage of sampled voltage Vmd after RC filter circuit is filtering voltage Vrc.According to laser to quiescent bias current I
bIASthe difference of size requirements, we can arrange different reference voltage V ref.Compared by filtering voltage Vrc and reference voltage V ref, the output of the direct control DSP of the Output rusults of comparator CMP, by repeatedly sampling and comparing, controls the quiescent bias current I outputting to laser diode LD
bIASsize, finally when APC loop stability, the filtering voltage Vrc at comparator CMP two ends is equal with reference voltage V ref, now DSP control quiescent bias current I
bIASstable.
Laser has two kinds of application scenarioss: continuous mode and burst mode.Continuous mode is: it is continuous print, unbroken that laser receives data.Burst mode is: send a collection of data message instantaneously suddenly, distribute and just stop, and the time of stopping paying out is changeable, with randomness.For different application, the APC loop of laser driver is distinguished to some extent, because burst-mode receiver data are with randomness, so under burst mode, the APC of laser driver has maintenance function, can guarantee the data-signal correctly transmitting burst.From the angle of integrated circuit (IC) design, it is desirable to carry out design circuit by more cost-effective scheme.So present laser diode drive LDD chip, generally can support two kinds of application scenarioss: continuous mode and burst mode simultaneously.But the burst of burst mode data and randomness make burst mode and continuous mode APC loop have larger difference.
Want compatible continuous mode and burst mode two kinds of operative scenario simultaneously, the technical issues that need to address have two:
First problem is: in the application scenarios of burst mode, and laser diode LD may be turned off by burst enable signal for a long time, and now laser diode LD is not luminous, and photodiode MD does not also have monitor current I
mDthen sampled voltage Vmd may drop to zero, whether system needs to open according to burst enable signal to judge that whether sampled voltage Vmd is normal, when system burst is enable frequently open and turn off time, sampled voltage Vmd can be very unstable, filtering voltage Vrc also can become very unstable, and this makes a big impact to the correct output of comparator CMP.
Second Problem is: how to carry out filtering to sampled voltage Vmd.Because the luminous power in laser diode LD is data-signal, thus the photodiode MD monitor current of sampling also with the amplitude of data-signal and frequency proportional.In order to ensure the constant of laser diode LD Output optical power, after doing voltage transitions to the monitor current of photodiode MD, need to do filtering process.In this loop, to data processing delay the longest be filter circuit, the filter resistance R in Fig. 1 and the value size of electric capacity C directly determine the data processing speed of whole loop.The frequency of data-signal is less, then the time constant filter needed is larger, and frequency data signal is larger, and the time constant filter of needs is less.When optical module is operated in continuous mode, the photoelectric current that photodiode MD gathers is stable and continuous print, can according to the frequency of data-signal, get a comparatively suitable RC parameter, in order to ensure the stable of the state of comparator CMP, in the scope meeting system time, in a continuous mode, it is large as much as possible that the parameter of RC is got, and makes filtering voltage Vrc more stable.
But for the optical module being operated in burst mode, system needs APC circuit can respond the change of burst enable signal fast, so can not have any filtering to sampled voltage Vmd, in order to avoid APC loop has delay, affects response speed.Certainly, for the laser being operated in burst mode, the signal frequency of system acceptance is very fast, so when burst mode, even if not to sampled voltage Vmd filtering, also can not affect the stability of filtering voltage Vrc.
Generally speaking, no matter be the laser being operated in continuous mode, be still operated in the laser of burst mode, system all wishes that APC loop can work fast and stable.Therefore, in APC loop, continuous mode and these two kinds of patterns of burst mode can normally being worked, is field of lasers technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, there is provided a kind of to be suitable for continuously and the laser of burst mode monitors luminous power sample circuit and method, controlled by clock signal and burst enable signal, sampling filter is carried out to the photoelectric current of monitoring diode, the sample circuit of continuous mode and burst mode is united two into one, by the sequential of different mode, reach the object of respective sampling processing, continuous mode and burst mode can normally be worked.
Provided by the inventionly to be suitable for continuously and luminous power sample circuit monitored by the laser of burst mode, to comprise power vd D, reference voltage V ref, the sampled voltage Vmd of input, operational amplifier A MP, filter resistance R, electric capacity C and filtering voltage Vrc, also comprises the first resistance R1, second resistance R2, first NMOS tube M1, second NMOS tube M2, first K switch 1, second switch K2, 3rd K switch 3, 4th K switch 4, 5th K switch 5, operational amplifier A MP is used for electric capacity C quick charge, and the in-phase input end of operational amplifier A MP is connected with reference voltage V ref, the reverse input end of operational amplifier A MP respectively with the drain electrode of the first NMOS tube M1, one end of first resistance R1 connects, an other termination power vd D of the first resistance R1, and the output of operational amplifier A MP is connected with the grid of the first NMOS tube M1, and the grid of the first NMOS tube M1 is connected with the grid of the second NMOS tube M2, the source class of the first NMOS tube M1, the equal ground connection GND of source class of the second NMOS tube M2, the drain electrode of the second NMOS tube M2 is connected with one end of the second resistance R2, another termination power vd D of the second resistance R2, the sampled voltage Vmd of one termination input of the first K switch 1, another termination filtering voltage Vrc, one end of second switch K2 is connected with the drain electrode of the second NMOS tube M2, the positive pole of another termination capacitor C, the minus earth GND of electric capacity C, the sampled voltage Vmd of one termination input of the 3rd K switch 3, the other end is connected with one end of the 4th K switch 4, and the other end of the 4th K switch 4 is connected with one end of filter resistance R, and the other end of filter resistance R is connected with the positive pole of electric capacity C, the positive pole of one termination capacitor C of the 5th K switch 5, another termination filtering voltage Vrc.
On the basis of technique scheme, described first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 are controlled by respective timing control signal C1, C2, C3, C4, C5 respectively, if the control signal of certain switch is high level, then this switch closes; If the control signal of certain switch is low level, then this switch disconnects;
When laser works is at continuous mode, the control signal C1 of the first K switch 1 is always low level, and the first K switch 1 disconnects all the time, and the sampled voltage Vmd of input can not directly be sent to filtering voltage Vrc; The control signal C4 of the 4th K switch 4 is burst enable signals, and during continuous mode, burst enable signal is opened all the time, and the control signal C4 of the 4th K switch 4 is always high level, and the 4th K switch 4 closes all the time; In a continuous mode, the course of work of second switch K2, the 3rd K switch 3, the 5th K switch 5 is as follows: in first cycle T 1, the control signal C2 of second switch K2 is high level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are low level, then second switch K2 closes, and the 3rd K switch 3, the 5th K switch 5 disconnect; Second switch K2 closes, and the voltage of electric capacity C positive pole is charged to rapidly with reference voltage V ref equal; In second period T2, the control signal C2 of second switch K2 is low level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are high level, then second switch K2 disconnects, 3rd K switch 3, the 5th K switch 5 close, it is reference voltage V ref that electric capacity C have accumulated level within the T1 cycle, and sampled voltage Vmd, after filtering after resistance R and C filtering, passes to filtering voltage Vrc;
When laser works is at burst mode, in the 3rd cycle T 3, the control signal C1 of the first K switch 1, the control signal C4 of the 4th K switch 4 is high level, first K switch 1, 4th K switch 4 closes, the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 is low level, second switch K2, 3rd K switch 3, 5th K switch 5 disconnects, the enable signal that happens suddenly in the T3 cycle is effective, sampled voltage Vmd directly outputs to filtering voltage VRC by the first K switch 1, other path outputting to filtering voltage VRC is all disconnect, in the 4th cycle T 4, burst enable signal is invalid, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is high level, second switch K2, the 3rd K switch 3, the 5th K switch 5 are all closed, now, the size of filtering voltage Vrc is determined by reference voltage V ref.
On the basis of technique scheme, the current potential of described electric capacity C positive pole is determined from the time that 0 is charged to reference voltage V ref by the first resistance R1, the second resistance R2, the first NMOS tube M1, the second NMOS tube M2.
On the basis of technique scheme, the breadth length ratio of described second NMOS tube M2 is N times of the breadth length ratio of the first NMOS tube M1, and N is scalar multiple.
The present invention also provides a kind of laser that is continuous and burst mode that is suitable for based on foregoing circuit to monitor the luminous power method of sampling, comprises the following steps:
Described first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 are controlled by respective timing control signal C1, C2, C3, C4, C5 respectively, if the control signal of certain switch is high level, then this switch closes; If the control signal of certain switch is low level, then this switch disconnects;
When laser works is at continuous mode, the control signal C1 of the first K switch 1 is always low level, and the first K switch 1 disconnects all the time, and the sampled voltage Vmd of input can not directly be sent to filtering voltage Vrc; The control signal C4 of the 4th K switch 4 is burst enable signals, and during continuous mode, burst enable signal is opened all the time, and the control signal C4 of the 4th K switch 4 is always high level, and the 4th K switch 4 closes all the time; In a continuous mode, the course of work of second switch K2, the 3rd K switch 3, the 5th K switch 5 is as follows: in first cycle T 1, the control signal C2 of second switch K2 is high level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are low level, then second switch K2 closes, and the 3rd K switch 3, the 5th K switch 5 disconnect; Second switch K2 closes, and the voltage of electric capacity C positive pole is charged to rapidly with reference voltage V ref equal; In second period T2, the control signal C2 of second switch K2 is low level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are high level, then second switch K2 disconnects, 3rd K switch 3, the 5th K switch 5 close, it is reference voltage V ref that electric capacity C have accumulated level within the T1 cycle, and sampled voltage Vmd, after filtering after resistance R and C filtering, passes to filtering voltage Vrc;
When laser works is at burst mode, in the 3rd cycle T 3, the control signal C1 of the first K switch 1, the control signal C4 of the 4th K switch 4 is high level, first K switch 1, 4th K switch 4 closes, the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 is low level, second switch K2, 3rd K switch 3, 5th K switch 5 disconnects, the enable signal that happens suddenly in the T3 cycle is effective, sampled voltage Vmd directly outputs to filtering voltage VRC by the first K switch 1, other path outputting to filtering voltage VRC is all disconnect, in the 4th cycle T 4, burst enable signal is invalid, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is high level, second switch K2, the 3rd K switch 3, the 5th K switch 5 are all closed, now, the size of filtering voltage Vrc is determined by reference voltage V ref.
On the basis of technique scheme, the current potential of described electric capacity C positive pole is determined from the time that 0 is charged to reference voltage V ref by the first resistance R1, the second resistance R2, the first NMOS tube M1, the second NMOS tube M2.
On the basis of technique scheme, the breadth length ratio of described second NMOS tube M2 is N times of the breadth length ratio of the first NMOS tube M1, and N is scalar multiple.
Compared with prior art, advantage of the present invention is as follows:
Sample circuit of the present invention is controlled by clock signal and burst enable signal, sampling filter is carried out to the photoelectric current of monitoring diode, the sample circuit of continuous mode and burst mode is united two into one, no matter laser works is at continuous mode or burst mode, can process with this cover sample circuit simultaneously, by the sequential of different mode, reach the object of respective sampling processing, continuous mode and these two kinds of patterns of burst mode can normally be worked.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of LDD chip.
Fig. 2 is suitable for the circuit diagram that luminous power sample circuit monitored by laser that is continuous and burst mode in the embodiment of the present invention.
The sequential chart of control signal when Fig. 3 is continuous mode in the embodiment of the present invention.
The sequential chart of T2 when Fig. 4 is continuous mode in the embodiment of the present invention.
The sequential chart of control signal when Fig. 5 is burst mode in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 2, the embodiment of the present invention provides a kind of and is suitable for laser monitoring luminous power sample circuit that is continuous and burst mode, comprises power vd D, reference voltage V ref, the sampled voltage Vmd of input, operational amplifier A MP, first resistance R1, second resistance R2, filter resistance R, electric capacity C, filtering voltage Vrc, first NMOS tube M1, second NMOS tube M2, first K switch 1, second switch K2, 3rd K switch 3, 4th K switch 4 and the 5th K switch 5, operational amplifier A MP are used for electric capacity C quick charge, and the in-phase input end of operational amplifier A MP is connected with reference voltage V ref, the reverse input end of operational amplifier A MP respectively with the drain electrode of the first NMOS tube M1, one end of first resistance R1 connects, an other termination power vd D of the first resistance R1, and the output of operational amplifier A MP is connected with the grid of the first NMOS tube M1, and the grid of the first NMOS tube M1 is connected with the grid of the second NMOS tube M2, the source class of the first NMOS tube M1, the equal ground connection GND of source class of the second NMOS tube M2, the drain electrode of the second NMOS tube M2 is connected with one end of the second resistance R2, another termination power vd D of the second resistance R2, the sampled voltage Vmd of one termination input of the first K switch 1, another termination filtering voltage Vrc, one end of second switch K2 is connected with the drain electrode of the second NMOS tube M2, the positive pole of another termination capacitor C, the minus earth GND of electric capacity C, the sampled voltage Vmd of one termination input of the 3rd K switch 3, the other end is connected with one end of the 4th K switch 4, and the other end of the 4th K switch 4 is connected with one end of filter resistance R, and the other end of filter resistance R is connected with the positive pole of electric capacity C, the positive pole of one termination capacitor C of the 5th K switch 5, another termination filtering voltage Vrc.
Shown in Figure 2, the Main Function of operational amplifier A MP, the first NMOS tube M1, the second NMOS tube M2, the first resistance R1, second this part circuit of resistance R2 carries out quick charge to electric capacity C, and the voltage swing of charging is determined by reference voltage V ref.Filter resistance R and electric capacity C is exactly the low-pass filter circuit in Fig. 1, and the first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 are controlled by respective timing control signal C1, C2, C3, C4, C5 respectively.These components and parts, according to such connected mode and control mode work, can realize the filtering sampling of compatible continuous mode and burst mode simultaneously.
On the basis of above-mentioned laser monitoring luminous power sample circuit, the embodiment of the present invention also provides a kind of and is suitable for the laser monitoring luminous power method of sampling that is continuous and burst mode, comprises the following steps:
When laser works is at continuous mode, the control signal of the first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 is respectively C1, C2, C3, C4, C5, the sequential of 5 control signal C1, C2, C3, C4, C5 should be arranged according to the sequential chart shown in Fig. 3, if the control signal of certain switch is high level, then this switch closes; If the control signal of certain switch is low level, then this switch disconnects.
Shown in Figure 3, the control signal C1 of the first K switch 1 is always low level, and the first K switch 1 disconnects all the time, and the sampled voltage Vmd of input can not directly be sent to filtering voltage Vrc.The control signal C4 of the 4th K switch 4 is burst enable signals, because during continuous mode, burst enable signal is opened all the time, so the control signal C4 of the 4th K switch 4 is always high level, the 4th K switch 4 closes all the time.
In a continuous mode, the course of work of second switch K2, the 3rd K switch 3, the 5th K switch 5 is as follows:
Shown in Figure 3, in first cycle T 1, the control signal C2 of second switch K2 is high level, and the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are low level, then second switch K2 closes, and the 3rd K switch 3, the 5th K switch 5 disconnect.It is that electric capacity C charges that second switch K2 closes the quick-charging circuit meaned now, and the voltage of electric capacity C positive pole can be charged to rapidly with reference voltage V ref equal.The current potential of electric capacity C positive pole is determined from the time that 0 is charged to reference voltage V ref by the first resistance R1, the second resistance R2, the first NMOS tube M1, the second NMOS tube M2.Capacitance due to electric capacity C is fixing, wants to charge to electric capacity C fast, just needs the output resistance of quick-charging circuit enough little.
In order to reduce the output resistance of quick-charging circuit, need careful design first NMOS tube M1, the second NMOS tube M2 and the ratio between the first resistance R1, the second resistance R2, the breadth length ratio of the second NMOS tube M2 is set to the N of the breadth length ratio of the first NMOS tube M1 doubly, N is scalar multiple.Suppose that the voltage of the node between the first resistance R1 and the first NMOS tube M1 is V1, the voltage of the node between the second resistance R2 and the second NMOS tube M2 is V2, first resistance R1 is N times of the second resistance R2, the voltage of such V2 is the same with the voltage of V1, the output resistance of quick-charging circuit is determined by the second resistance R2 simultaneously, second resistance R2 is less, faster to the time of capacitor charging.Although the value of N is larger, output resistance is less, and charging rate is faster, but the excessive power consumption that also can increase by the second NMOS tube M2 of the value of N.
In actual applications, the relation of power consumption and charging rate should be considered, at the first NMOS tube M1, the second NMOS tube M2 with get a suitable ratio between the first resistance R1, the second resistance R2.In first cycle T 1, the voltage of electric capacity C positive pole is charged to rapidly with reference voltage V ref equal, and the time length of T1 is also determined by the charging interval.In order to ensure stable charging circuit, the value of general T1 is slightly larger than the charging interval.
Shown in Figure 3, in second period T2, the control signal C2 of second switch K2 is low level, and the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are high level, then second switch K2 disconnects, and the 3rd K switch 3, the 5th K switch 5 close.Now, although second switch K2 is disconnected, it is reference voltage V ref that electric capacity C have accumulated level within the T1 cycle, and sampled voltage Vmd, after filtering after resistance R and C filtering, passes to filtering voltage Vrc.Time of R*C is the voltage of electric capacity C is charged to filtering voltage Vrc process by zero, because electric capacity C, within the T1 cycle, is charged to reference voltage V ref, so electric capacity C changes to the time of filtering voltage Vrc from reference voltage V ref, is exactly the time of T2.Because there is the quick charge in the T1 cycle, thus the time of T2 no longer determined by Trc=R*C, but by Fig. 4 T2 determine.If filtering voltage Vrc and reference voltage V ref is more close, then the at every turn stable time is less, substantially reduces the filtering time under continuous mode, effectively can reduce the time of APC loop stability.
In actual applications, according to the frequency of transmission of signal, can carry out segmentation value to filter resistance R, when transmission of signal frequency height, T2 can select less time constant, and the signal transacting cycle accelerates; When signal frequency is low, T2 can select longer time constant, and sampled voltage Vmd can filter cleaner.
When laser works is at burst mode, the sequential chart of 5 control signal C1, C2, C3, C4, C5 is shown in Figure 5, in the 3rd cycle T 3, the control signal C1 of the first K switch 1, the control signal C4 of the 4th K switch 4 are high level, first K switch 1, the 4th K switch 4 close, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is low level, and second switch K2, the 3rd K switch 3, the 5th K switch 5 disconnect.The enable signal that happens suddenly in the T3 cycle is effective, and sampled voltage Vmd directly outputs to filtering voltage VRC by the first K switch 1, and other path outputting to filtering voltage VRC is all disconnect.This is because burst System requires that system has very fast response speed, sampled voltage Vmd can not have any delay directly to output to filtering voltage Vrc.
In the 4th cycle T 4, burst enable signal is invalid, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is high level, namely second switch K2, the 3rd K switch 3, the 5th K switch 5 are all closed, now, the size of filtering voltage Vrc is determined by reference voltage V ref.At this moment, the same with previously described, reference voltage V ref charges to rapidly electric capacity C by quick-charging circuit, to prevent the laser when the enable signal that happens suddenly is invalid unglazed, sampled voltage Vmd will drop to zero, now, by quick-charging circuit constantly for electric capacity C charges, can ensure that the output state of comparator is stablized.That is, even if burst does not stop conversion or turns off for a long time, filtering voltage Vrc has a stable state all the time, and the state of comparator also would not be chaotic.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in specification is known to the skilled person.
Claims (5)
1. be suitable for a laser monitoring luminous power sample circuit that is continuous and burst mode, comprise power vd D, reference voltage V ref, the sampled voltage Vmd of input, operational amplifier A MP, filter resistance R, electric capacity C and filtering voltage Vrc, is characterized in that: also comprise the first resistance R1, second resistance R2, first NMOS tube M1, second NMOS tube M2, first K switch 1, second switch K2, 3rd K switch 3, 4th K switch 4, 5th K switch 5, operational amplifier A MP is used for electric capacity C quick charge, and the in-phase input end of operational amplifier A MP is connected with reference voltage V ref, the reverse input end of operational amplifier A MP respectively with the drain electrode of the first NMOS tube M1, one end of first resistance R1 connects, an other termination power vd D of the first resistance R1, and the output of operational amplifier A MP is connected with the grid of the first NMOS tube M1, and the grid of the first NMOS tube M1 is connected with the grid of the second NMOS tube M2, the source class of the first NMOS tube M1, the equal ground connection GND of source class of the second NMOS tube M2, the drain electrode of the second NMOS tube M2 is connected with one end of the second resistance R2, another termination power vd D of the second resistance R2, the sampled voltage Vmd of one termination input of the first K switch 1, another termination filtering voltage Vrc, one end of second switch K2 is connected with the drain electrode of the second NMOS tube M2, the positive pole of another termination capacitor C, the minus earth GND of electric capacity C, the sampled voltage Vmd of one termination input of the 3rd K switch 3, the other end is connected with one end of the 4th K switch 4, and the other end of the 4th K switch 4 is connected with one end of filter resistance R, and the other end of filter resistance R is connected with the positive pole of electric capacity C, the positive pole of one termination capacitor C of the 5th K switch 5, another termination filtering voltage Vrc.
2. be suitable for laser monitoring luminous power sample circuit that is continuous and burst mode as claimed in claim 1, it is characterized in that: described first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 are controlled by respective timing control signal C1, C2, C3, C4, C5 respectively, if the control signal of certain switch is high level, then this switch closes; If the control signal of certain switch is low level, then this switch disconnects;
When laser works is at continuous mode, the control signal C1 of the first K switch 1 is always low level, and the first K switch 1 disconnects all the time, and the sampled voltage Vmd of input can not directly be sent to filtering voltage Vrc; The control signal C4 of the 4th K switch 4 is burst enable signals, and during continuous mode, burst enable signal is opened all the time, and the control signal C4 of the 4th K switch 4 is always high level, and the 4th K switch 4 closes all the time; In a continuous mode, the course of work of second switch K2, the 3rd K switch 3, the 5th K switch 5 is as follows: in first cycle T 1, the control signal C2 of second switch K2 is high level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are low level, then second switch K2 closes, and the 3rd K switch 3, the 5th K switch 5 disconnect; Second switch K2 closes, and the voltage of electric capacity C positive pole is charged to rapidly with reference voltage V ref equal; In second period T2, the control signal C2 of second switch K2 is low level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are high level, then second switch K2 disconnects, 3rd K switch 3, the 5th K switch 5 close, it is reference voltage V ref that electric capacity C have accumulated level within the T1 cycle, and sampled voltage Vmd, after filtering after resistance R and C filtering, passes to filtering voltage Vrc;
When laser works is at burst mode, in the 3rd cycle T 3, the control signal C1 of the first K switch 1, the control signal C4 of the 4th K switch 4 is high level, first K switch 1, 4th K switch 4 closes, the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 is low level, second switch K2, 3rd K switch 3, 5th K switch 5 disconnects, the enable signal that happens suddenly in the T3 cycle is effective, sampled voltage Vmd directly outputs to filtering voltage VRC by the first K switch 1, other path outputting to filtering voltage VRC is all disconnect, in the 4th cycle T 4, burst enable signal is invalid, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is high level, second switch K2, the 3rd K switch 3, the 5th K switch 5 are all closed, now, the size of filtering voltage Vrc is determined by reference voltage V ref.
3. be suitable for laser monitoring luminous power sample circuit that is continuous and burst mode as claimed in claim 2, it is characterized in that: the current potential of described electric capacity C positive pole was determined by the first resistance R1, the second resistance R2, the first NMOS tube M1, the second NMOS tube M2 from the time that 0 is charged to reference voltage V ref.
4. the luminous power method of sampling monitored by the laser that is continuous and burst mode that is suitable for based on circuit described in claim 1, it is characterized in that, comprises the following steps:
Described first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5 are controlled by respective timing control signal C1, C2, C3, C4, C5 respectively, if the control signal of certain switch is high level, then this switch closes; If the control signal of certain switch is low level, then this switch disconnects;
When laser works is at continuous mode, the control signal C1 of the first K switch 1 is always low level, and the first K switch 1 disconnects all the time, and the sampled voltage Vmd of input can not directly be sent to filtering voltage Vrc; The control signal C4 of the 4th K switch 4 is burst enable signals, and during continuous mode, burst enable signal is opened all the time, and the control signal C4 of the 4th K switch 4 is always high level, and the 4th K switch 4 closes all the time; In a continuous mode, the course of work of second switch K2, the 3rd K switch 3, the 5th K switch 5 is as follows: in first cycle T 1, the control signal C2 of second switch K2 is high level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are low level, then second switch K2 closes, and the 3rd K switch 3, the 5th K switch 5 disconnect; Second switch K2 closes, and the voltage of electric capacity C positive pole is charged to rapidly with reference voltage V ref equal; In second period T2, the control signal C2 of second switch K2 is low level, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 are high level, then second switch K2 disconnects, 3rd K switch 3, the 5th K switch 5 close, it is reference voltage V ref that electric capacity C have accumulated level within the T1 cycle, and sampled voltage Vmd, after filtering after resistance R and C filtering, passes to filtering voltage Vrc;
When laser works is at burst mode, in the 3rd cycle T 3, the control signal C1 of the first K switch 1, the control signal C4 of the 4th K switch 4 is high level, first K switch 1, 4th K switch 4 closes, the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the control signal C5 of the 5th K switch 5 is low level, second switch K2, 3rd K switch 3, 5th K switch 5 disconnects, the enable signal that happens suddenly in the T3 cycle is effective, sampled voltage Vmd directly outputs to filtering voltage VRC by the first K switch 1, other path outputting to filtering voltage VRC is all disconnect, in the 4th cycle T 4, burst enable signal is invalid, the control signal C5 of the control signal C2 of second switch K2, the control signal C3 of the 3rd K switch 3, the 5th K switch 5 is high level, second switch K2, the 3rd K switch 3, the 5th K switch 5 are all closed, now, the size of filtering voltage Vrc is determined by reference voltage V ref.
5. be suitable for the laser monitoring luminous power method of sampling that is continuous and burst mode as claimed in claim 4, it is characterized in that: the current potential of described electric capacity C positive pole was determined by the first resistance R1, the second resistance R2, the first NMOS tube M1, the second NMOS tube M2 from the time that 0 is charged to reference voltage V ref.
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| CN108833869B (en) * | 2018-07-27 | 2020-07-21 | 浙江传媒学院 | Switchable burst light emitting circuit for uplink channel of cable television network |
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| US6563848B1 (en) * | 1999-08-06 | 2003-05-13 | Pentax Corporation | Semiconductor laser drive device |
| EP1544855A1 (en) * | 2003-12-15 | 2005-06-22 | Thomson Licensing S.A. | Compatible laser modulation circuit for scanner in optical storage media recording/reproducing apparatus |
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| CN101350676A (en) * | 2008-09-03 | 2009-01-21 | 烽火通信科技股份有限公司 | Automatic average optical power control system for bursting light emission module |
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| JP3950122B2 (en) * | 1999-06-25 | 2007-07-25 | 株式会社東芝 | Semiconductor integrated circuit, optical pickup optical system unit including the same, and optical pickup device |
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| US6563848B1 (en) * | 1999-08-06 | 2003-05-13 | Pentax Corporation | Semiconductor laser drive device |
| EP1544855A1 (en) * | 2003-12-15 | 2005-06-22 | Thomson Licensing S.A. | Compatible laser modulation circuit for scanner in optical storage media recording/reproducing apparatus |
| CN101030693A (en) * | 2007-04-03 | 2007-09-05 | 烽火通信科技股份有限公司 | Automatic illuminating-power controlling circuit for laser driver |
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