CN102564573B - Multi-wavelength laser power time division measurement method - Google Patents
Multi-wavelength laser power time division measurement method Download PDFInfo
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- CN102564573B CN102564573B CN201110450479.5A CN201110450479A CN102564573B CN 102564573 B CN102564573 B CN 102564573B CN 201110450479 A CN201110450479 A CN 201110450479A CN 102564573 B CN102564573 B CN 102564573B
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Abstract
The invention discloses a multi-wavelength laser power time division measurement method. A plurality of laser sources output laser to a piece to be measured through a combiner; in the process of performing laser power measurement on the piece to be measured, modulation and demodulation synchronous control is used, a time division method is applied, the laser sources are digitally modulated through the modulation and demodulation synchronous control in a time division mode, the laser sources with different wavelengths are selected as testing excitation in different periods, and at a measurement end, laser with different wavelengths is separated and the laser power of each wavelength is measured according to the arrangement of different periods. The invention has the advantages that: the multi-wavelength laser power time division measurement method is suitable for the most basic measurement of optical communication passive devices or equipment, and can meet the high-precision and real-time measurement requirement of the devices or equipment; 2, an on-line detection means is provided for monitoring multi-wavelength laser power in real time; 3, multi-wavelength testing operation for the optical communication devices or equipment is simplified; and 4, the cost is low and the efficiency is high.
Description
Technical field
The present invention relates to a kind of measuring method, particularly be applied to the Multi-wavelength laser power measuring method of the parameter measurement of optical communication passive device or equipment.
Background technology
The laser power measurement relevant to optical wavelength is the manufacturing, debugging, measuring fiber communication device or the modal measurement of equipment, due to light sensor (as: PIN pipe, APD pipe etc.) do not there is wavelength selectivity, need wavelength separated and wavelength selection unit in test macro.
Well-known test macro has several as follows:
1, the measuring light power of discontinuous wavelength
The measuring light power occasion that need to carry out discontinuous wavelength at some has following organization plan usually:
A) insert wavelength separated/selected cell (Fig. 1) after the measured piece.
B) insert wavelength separated/selected cell (Fig. 2, Fig. 3) before measured device.
In above structure, adopt interleaver as the wavelength separated unit, and usually adopt photoswitch as wavelength selection unit.Photoswitch is owing to there being following shortcoming:
The repetitive error of photoswitch: >=0.05db;
The photoswitch switching is slow, and time delay reaches a few tens of milliseconds;
The switch life of photoswitch is limited, is unsuitable for repeatedly switching continuously.
And the parameter measurement of optical communication passive device or equipment, as: multi-wavelength insertion loss, return loss, the isoparametric measurement of Polarization Dependent Loss, require the relative accuracy of measuring system to be better than 0.01dB, therefore, high-precision measurement requirement can not be met with photoswitch as the measuring system of selected cell, real-time measurement requirement can not be met.
2, other measurement scheme
Tunable laser sources+measuring light power unit.
Wideband light source+spectrometer.
Above-mentioned measurement scheme, the measuring method of employing spectral scan, carry out the measurement of continuous spectrum.But, due to Wavelength stabilized and spectral scan, consuming time quite long, usually need the several seconds.So, also can't meet real-time measurement requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Multi-wavelength laser power time division measurement method, is applicable to the parameter measurement of optical communication passive device or equipment, and can meet high precision and real-time measurement requirement.
The present invention solves the problems of the technologies described above by the following technical solutions: a kind of Multi-wavelength laser power time division measurement method, a plurality of LASER Light Source output to measured piece through wave multiplexer, in measured piece is carried out to measuring light power, used the modulation /demodulation synchro control, use time-sharing procedure, carry out the Digital Modulation of LASER Light Source by the timesharing of modulation /demodulation synchro control, the synchronous demodulation of measuring light power end, and the laser power of measurement corresponding wavelength, under synchronizing signal is controlled, the LASER Light Source of different choosing period of time different wave lengths is as the excitation of test, at measuring junction, arrangement according to the different periods, isolate the laser of different wave length, and measure the luminous power of each wavelength.
This invention further is specially:
Described modulation /demodulation synchro control is placed on the excitation end.
Perhaps described modulation /demodulation synchro control is placed on measuring junction, with the measuring light power meter, combines and forms the measuring light power structure.
As an example, described measuring light power structure comprises embedded type CPU, A/D converter, the synchronous modulation signal generator, N resistor chain in parallel, N+1 analog switch, with N N the low-pass filter that resistor chain is corresponding, operational amplifier, photoelectric tube, embedded type CPU, A/D converter, the synchronous modulation signal generator connects successively, a measurement port of photoelectric tube connects the fiber-optic output mouth of measured piece, synchronous modulation signal generator output modulation signal is to LASER Light Source, wherein, each resistor chain includes M resistance in parallel, gear shift for different ranges, the output terminal of each resistor chain M:1 analog switch of all connecting, concrete, wherein the second end of each resistance all is connected to a non-common port corresponding in the M:1 analog switch, a N:1 analog switch of input end series connection of operational amplifier, concrete, the input end of operational amplifier connects the common port of N:1 analog switch, the control end of described each M:1 analog switch and N:1 analog switch is all received the synchronous modulation signal generator, the common port of each M:1 analog switch all is connected to A/D converter, and then be connected to CPU and carry out power measurement, the non-common port of N:1 analog switch is connected respectively on the branch road between each M:1 analog switch common port and low-pass filter, the output terminal of operational amplifier is connected to photoelectric tube, the negative electrode of photoelectric tube is connected to the first end of resistance in each resistor chain simultaneously,
At first by embedded type CPU, controlled, output to the control end of N:1 analog switch by A/D converter, select corresponding passage, make this passage connect operational amplifier, form feedback channel, when channel selecting is " 0 ", the M:1 analog switch contract fully of this passage, when channel selecting is " 1 ", by embedded type CPU, control again, A/D converter outputs to the M:1 analog switch, and the switch of the corresponding range of gating records the laser power instantaneous value of this passage.
In a upper embodiment, the common port of each M:1 analog switch can also all be connected to A/D converter by a low-pass filter, now, records the laser power mean value of this passage.
As another embodiment, described measuring light power structure comprises embedded type CPU, A/D converter, the synchronous modulation signal generator, a N in parallel program control I/V amplifier, the 1:N analog switch, N low-pass filter, photoelectric tube, embedded type CPU, A/D converter, the synchronous modulation signal generator connects successively, a measurement port of photoelectric tube connects the fiber-optic output mouth of measured piece, synchronous modulation signal generator output modulation signal is to LASER Light Source, the negative electrode of photoelectric tube connects the common port of 1:N analog switch, the non-common port of the N of 1:N analog switch connects respectively a programmable amplifier, be connected to A/D converter by a low-pass filter after each programmable amplifier, then be connected to embedded type CPU and carry out measuring light power, the control end of described 1:N analog switch and the control end of programmable amplifier all are connected to the synchronous modulation signal generator,
At first by embedded type CPU, controlled, output to the control end of 1:N analog switch by A/D converter, select corresponding passage, when channel selecting is " 0 ", the programmable amplifier contract fully of this passage, when channel selecting is " 1 ", by embedded type CPU, control, A/D converter outputs to programmable amplifier again, the corresponding range of gating, after low-pass filtering, what record is the laser power mean value of this passage.
Described LASER Light Source, comprise first adder, the optical power adjustment device, biasing circuit, second adder, driving/holding circuit, semiconductor laser tube LD, photoelectric tube PD, diode D, feedback factor K1f, K2f, and analog switch, the input end of first adder connects respectively the given negative feedback end with luminous power of luminous power, luminous power is given enters the light power governor with feedback luminous power after the first adder addition, analog switch has three contacts, the output terminal of optical power adjustment device connects the first contact, the second contact connects biasing circuit, the control end of digital modulation signals input analog switch, the 3rd contact is public contact, link an input end of second adder, another two input ends of second adder connect respectively input modulated-analog signal and current feedback, the output of second adder enters driving/holding circuit after current regulator, the output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD, semiconductor laser tube LD after feedback factor K2f as current feedback, the two ends of the semiconductor laser tube LD that diode D is connected in parallel on, the positive pole of diode D connects the negative pole of semiconductor laser tube LD, the positive pole of photoelectric tube PD connects the negative pole of semiconductor laser tube LD, the negative pole of photoelectric tube PD after feedback factor K1f as the negative feedback end of luminous power,
During Digital Modulation, when modulation signal is level"1", the 3rd contact and the first contact are connected, the laser that output amplitude is stable, during level "0", the 3rd contact and the first contact disconnect, and with the second contact, connect, the negative sense bias voltage access that biasing circuit provides, make semiconductor laser tube LD reverse bias;
When direct current or analog-modulated, the 3rd contact and the first contact are connected always.
This stable LASER Light Source also comprises embedded type CPU, D/A converter, and embedded type CPU is connected to an input end of first adder by D/A converter.
Perhaps this stable LASER Light Source also comprises rectifier, embedded type CPU, A/D converter, and when analog-modulated, modulated-analog signal is connected to an input end of first adder by rectifier, embedded type CPU, A/D converter.
The invention has the advantages that: 1, be applicable to optical communication passive device or the most basic measurement of equipment, as: insertion loss, return loss, Polarization Dependent Loss etc.Multi-wavelength light power real-time detection method, not only can be used for light power meter, also can be used for the return loss instrument, and the instruments such as Polarization Dependent Loss measuring instrument, can meet the high precision of these devices or equipment and real-time measurement requirement;
2, in the manufacturing process of photoconductive fiber communication apparatus, for multi-wavelength light power Real-Time Monitoring provides online detection means, for the utilization of feedback control technology provides condition;
3, avoid selection and the switching of wavelength, simplify the multi-wavelength test operation of photoconductive fiber communication apparatus or equipment;
4, cost is low, and efficiency is high.
The accompanying drawing explanation
Fig. 1 to Fig. 3 is the structure principle chart of existing three kinds of optical power measuring devices.
Fig. 4 is the structure principle chart of Multi-wavelength laser power time division measurement method of the present invention.
Fig. 5 is principle of the invention scheme oscillogram.
Fig. 6 is the structure principle chart of the first embodiment of the measuring light power structure in the present invention.
Fig. 7 is the structure principle chart of the second embodiment of the measuring light power structure in the present invention.
Fig. 8 is the structure principle chart of the 3rd embodiment of the measuring light power structure in the present invention.
Fig. 9 is the structure principle chart of the LASER Light Source used in the present invention.
Embodiment
Refer to Fig. 4, Multi-wavelength laser power time division measurement method of the present invention comprises a plurality of LASER Light Source, wave multiplexer, measuring light power meter and modulation /demodulation isochronous controller.
The output terminal of the adjusting termination modulation /demodulation isochronous controller of each LASER Light Source in described a plurality of LASER Light Source, the output terminal of each LASER Light Source is received the input port of the correspondence of wave multiplexer, the output port of wave multiplexer is connected to measured piece, the measuring light power meter is connected to the other end of measured piece, and the modulation /demodulation isochronous controller is connected with the measuring light power meter simultaneously.
This patent Multi-wavelength laser power is measured and is used time-sharing procedure, carries out the Digital Modulation of LASER Light Source by the timesharing of modulation /demodulation isochronous controller, the synchronous demodulation of measuring light power end, and the laser power of measurement corresponding wavelength.
Described demodulation in the present invention refers to that the LASER Light Source of different choosing period of time different wave lengths is as the excitation of test under synchronizing signal is controlled; At measuring junction, according to the arrangement of different periods, isolate the laser of different wave length, and measure the luminous power of each wavelength.
Modulation /demodulation isochronous controller in the present invention can be used as individual components, also can combine with measuring light power meter or LASER Light Source, to be combined as preferably with measuring light power.When modulation /demodulation isochronous controller and the combination of measuring light power meter, be about to the modulation /demodulation synchro control and be placed on measuring junction, when modulation /demodulation isochronous controller and LASER Light Source combination, be about to the modulation /demodulation synchro control and be placed on the excitation end.
Principle scheme oscillogram of the present invention is shown in Fig. 5, and in Fig. 5, the output of each LASER Light Source is synchronizeed with input modulating signal separately, so the output (1) of light source (λ 1) has similar waveform with modulation 1; The output (2) of light source (λ 2) has similar waveform with modulation 2; Light source (λ 2) ... light source (λ n) similarly.The input A of measured piece has with output B the similar waveform that the laser power amplitude is different.T is called dead band, prevents from intersecting disturbing.
With reference to Fig. 5, it is as described below that described LASER Light Source is closed the computation process of the luminous power calculating that luminous power is calculated, B is ordered that the A after ripple orders and optical power loss, average light power:
1. establish: amplitude is A, and the cycle is T, and pulsewidth is τ, and time variable is t.
The periodic square wave function expression is:
f(t)=A∑{u[t-(m-1)T]- u[t-τ-(m-1)T]} ( m=1,2,……) ......(1)
In formula: m is the cycle ordinal number, and u (t) is unit-step function.(lower same, slightly)
If: pulse delay is σ.
Order: t=x-σ, substitution (1) formula; After substitution of variable, then use the former formula of t=x substitution.
:
f(t, σ)=A∑{u[t-σ-(m-1)T]- u[t-τ-σ-(m-1)T]} ( m=1,2,……) ......(2)
If: A=1, dead band is δ, n is passage ordinal number: n=1,2 ... N (lower same, slightly)
: (τ+δ) substitution (2) formula of σ=(n-1):
f(t, (n-1)(τ+δ))= f(t, n)
=A∑{u[t-(n-1)(τ+δ)- (m-1)T]- u[t-τ-(n-1)(τ+δ)- (m-1)T]}
=A∑{u[t-(n-1)(τ+δ)- (m-1)T]- u[t-nτ-(n-1)δ-(m-1)T]}
(m=1,2,……) ......(3)
2. establish: A=1.
∵ modulates 1 n=1.
∴ modulates 1 expression formula to be had:
f(t,1)=∑{u[t-(m-1)T]- u[t-τ-(m-1)T]} (m=1,2,……)
∵ modulates 2 n=2.
∴ modulates 2 expression formulas to be had:
f(t,2)=∑{u[t-(τ+δ)- (m-1)T]- u[t-2τ-δ-(m-1)T]} (m=1,2,……)
In like manner, modulation N n=N.
The expression formula of ∴ modulation N has:
f(t,N)= ∑{u[t-(N-1)(τ+δ)-(m-1)T]- u[t-Nτ-(N-1)δ-(m-1)T]} (m=1,2,……)
3. establish: wavelength X i light source light output pulses amplitude is P λ i, and i=n.(i=1,2,…N)
So, the light source 1 of wavelength X 1 is output as:
pλ1(t,1)= Pλ1∑{u[t-(m-1)T]- u[t-τ-(m-1)T]} (m=1,2,……)
The light source 2 of wavelength X 2 is output as:
pλ2(t,2)= Pλ2∑{u[t-(τ+δ)- (m-1)T]- u[t-2τ-δ-(m-1)T]} (m=1,2,……)
In like manner, the light source N of wavelength X n is output as:
pλn(t,N)= Pλn∑{u[t-(N-1)(τ+δ)-(m-1)T]- u[t-Nτ-(N-1)δ-(m-1)T]} (m=1,2,……)
4. hypothesis: wave multiplexer is desirable device, decays to the luminous power expression formula that 0, A orders to be:
pa(t)= pλ1(t,1)+ pλ2(t,2)+ ┄┄ + pλn(t,N)
=∑pλi(t,i) (i=1,2,…N)
=∑∑Pλi{u[t-(i-1)(τ+δ)-(m-1)T]- u[t-iτ-(i-1)δ-(m-1)T]} (m=1,2,……)
5. establish: during wavelength X i, the measured piece transfer coefficient is K λ i.(Kλi≤1)。
The luminous power expression formula that B is ordered is:
pb(t)= Kλ1*pλ1(t,1)+ Kλ1*pλ2(t,2)+ ┄┄ + Kλn*pλn(t,N) =∑Kλi*pλi(t,i) (i=1,2,…N)
=∑∑Kλi*Pλi{u[t-(i-1)(τ+δ)-(m-1)T]- u[t-iτ-(i-1)δ-(m-1)T]} (m=1,2,……)
6. the demodulation expression formula of passage n is:
fn(t)= ∑{u[t-(n-1)(τ+δ)-(m-1)T]- u[t-nτ-(n-1)δ-(m-1)T]}
(n=1,2,3…N; m=1,2,……)
With fn (t) demodulation pb (t), i.e. fn (t) * pb (t), respectively:
f1(t)*pb(t)=Kλ1*Pλ1∑{u[t-(m-1)T]- u[t-τ-(m-1)T]}
(m=1,2,……)
f2(t)*pb(t)= Kλ2*Pλ2∑{u[t-(τ+δ)- (m-1)T]- u[t-2τ-δ-(m-1)T]}
(m=1,2,……)
fN(t)*pb(t)= KλN*Pλn∑{u[t-(N-1)(τ+δ)-(m-1)T]-u[t-Nτ-(N-1)-(m-1)T]}
(m=1,2,……)
Thus, record K λ n*P λ n, (n=1,2 ... N).
In like manner, measure the A point, obtain P λ n, (n=1,2 ... N)
7. the computing formula of average light power:
Pavgλi= Pλi*τ/T。
8. insertion loss calculates:
ILλi= -10*Log[(Kλi*Pλi)/ Pλi]
= -10*Log[Kλi ] (i=1,2…N)
Please refer to Fig. 6, is the structure principle chart of the first embodiment of the measuring light power structure in the present invention.It is the measuring light power structure that the function of modulation /demodulation synchro control and measuring light power is combined.
Described measuring light power structure comprise embedded type CPU, A/D converter, synchronous modulation signal generator, N resistor chain in parallel, a N+1 analog switch, with N N low-pass filter, operational amplifier, the photoelectric tube that resistor chain is corresponding.Embedded type CPU, A/D converter, synchronous modulation signal generator connect successively.A measurement port of photoelectric tube connects the fiber-optic output mouth of measured piece.Synchronous modulation signal generator output modulation signal is to LASER Light Source.
Wherein, each resistor chain includes M resistance in parallel, gear shift for different ranges, as 10dBm---70dBm divides 8 grades, the output terminal of each resistor chain M:1 analog switch of all connecting, concrete, wherein the second end of each resistance all is connected to a non-common port corresponding in the M:1 analog switch, a N:1 analog switch of input end series connection of operational amplifier, concrete, the input end of operational amplifier connects the common port of N:1 analog switch, also i.e. N M:1 analog switch altogether, 1 N:1 analog switch, the control end of described each M:1 analog switch and N:1 analog switch is all received the synchronous modulation signal generator, and the common port of each M:1 analog switch all is connected to A/D converter by a low-pass filter, and then be connected to CPU and carry out power measurement.The non-common port of N:1 analog switch is connected respectively on the branch road between each M:1 analog switch common port and low-pass filter.The output terminal of operational amplifier is connected to photoelectric tube, and the negative electrode of photoelectric tube is connected to the first end of resistance in each resistor chain simultaneously.
The course of work of this measuring light power structure is as described below:
At first by embedded type CPU, controlled, output to the control end of N:1 analog switch by A/D converter, select corresponding passage, make this passage connect operational amplifier, form feedback channel, when channel selecting is " 0 ", the M:1 analog switch contract fully of this passage, when channel selecting is " 1 ", then control by embedded type CPU, A/D converter outputs to the M:1 analog switch, the switch of the corresponding range of gating.After low-pass filtering, what record is the laser power mean value of this passage n (corresponding wavelength λ n).
Please refer to Fig. 7, is the structure principle chart of the second embodiment of the measuring light power structure in the present invention.
Described measuring light power structure comprises embedded type CPU, A/D converter, synchronous modulation signal generator, N program control I/V amplifier of parallel connection, 1:N analog switch, a N low-pass filter, photoelectric tube.Embedded type CPU, A/D converter, synchronous modulation signal generator connect successively.A measurement port of photoelectric tube connects the fiber-optic output mouth of measured piece.Synchronous modulation signal generator output modulation signal is to LASER Light Source.
The negative electrode of photoelectric tube connects the common port of 1:N analog switch, the non-common port of the N of 1:N analog switch connects respectively a programmable amplifier, be connected to A/D converter by a low-pass filter after each programmable amplifier, then be connected to embedded type CPU and carry out measuring light power.The control end of described 1:N analog switch and the control end of programmable amplifier all are connected to the synchronous modulation signal generator.
The course of work of this measuring light power structure is as described below:
At first by embedded type CPU, controlled, output to the control end of 1:N analog switch by A/D converter, select corresponding passage, when channel selecting is " 0 ", the programmable amplifier contract fully of this passage, when channel selecting is " 1 ", then control by embedded type CPU, A/D converter outputs to programmable amplifier, the corresponding range of gating.After low-pass filtering, what record is the laser power mean value of this passage n (corresponding wavelength λ n).
Please refer to Fig. 8, is the structure principle chart of the 3rd embodiment of the measuring light power structure in the present invention.The difference of this embodiment and above-mentioned the first embodiment is, after the M:1 analog switch, is directly connected to A/D converter, there is no low-pass filter, and now, what record is the laser power instantaneous value of this passage n (corresponding wavelength λ n).
Refer to shown in Fig. 9; be the structure principle chart of the LASER Light Source used of the present invention, the LASER Light Source that the present invention uses comprises first adder, optical power adjustment device, biasing circuit, analog switch, second adder, first signal generator, secondary signal generator, driving/holding circuit, semiconductor laser tube LD, photoelectric tube PD, diode D, feedback factor K1f, K2f, low-pass filter.
The input end of first adder connects respectively the given negative feedback end with luminous power of luminous power, luminous power is given enters the light power governor with feedback luminous power after the first adder addition, analog switch has three contacts, the output terminal of optical power adjustment device connects the first contact, the second contact connects biasing circuit, the control end of first signal generator connecting analog switch, the 3rd contact is the input end that public contact is linked second adder, another two input ends of second adder connect respectively secondary signal generator and current feedback terminal, the output of second adder enters driving/holding circuit after current regulator, the output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD, semiconductor laser tube LD after feedback factor K2f as current feedback terminal, the two ends of the semiconductor laser tube LD that diode D is connected in parallel on, the positive pole of diode D connects the negative pole of semiconductor laser tube LD, the positive pole of photoelectric tube PD connects the negative pole of semiconductor laser tube LD, the negative pole of photoelectric tube PD after feedback factor K1f and low-pass filter as the negative feedback end of luminous power.
By Fig. 9 and above-mentioned annexation, can be found out, described stable LASER Light Source consists of two closed loops: interior ring is electric current loop, through sampling and the negative feedback of the drive current of semiconductor laser tube LD, controls the drive current of semiconductor laser tube LD; Outer shroud is the luminous power ring, through sampling and the negative feedback of photoelectric tube PD, controls laser power.
The effect of each parts is as described below:
Wherein the first signal generator provides digital modulation signals, and the secondary signal generator provides modulated-analog signal, and now, digital modulation signals and modulated-analog signal produce by this LASER Light Source is inner.Certainly, also can be by an external modulation interface of input end of the control port of analog switch and second adder, thus obtain digital modulation signals and modulated-analog signal from outside.
The optical power adjustment device is integration or ratio or proportional integral amplifier.
Current regulator is ratio or integration proportional amplifier.
Feedback factor K1f, K2f are respectively drive current Ild and luminous power feedback factor.
Diode D provides the reverse-voltage protection of semiconductor laser tube LD, when given value of current when negative, for electric current loop provides current channel.
Luminous power is given as stable DC quantity.
Analog switch: during Digital Modulation, the 3rd contact of analog switch and first and second contact be switching alternately, and when direct current or analog quantity modulation, the 3rd contact and the first contact are connected.
Biasing circuit: during Digital Modulation, give the negative voltage value of the semiconductor laser tube LD reliable turn-off of sening as an envoy to.
Low-pass filter: adopt resistance capacity filter, or active filter.
Insert analog switch between optical power adjustment device and current regulator, isolated digital signal and system signal, avoided the impact of digital level fluctuation on degree of stability.
Driving/holding circuit, except electric current amplifies, has the defencive functions such as overcurrent, short circuit, back-pressure, the slow startup of start.
The course of work of this LASER Light Source is as described below:
During Digital Modulation, when modulation signal is level"1", the double loop system loop is connected, the laser that output amplitude is stable, during level "0", outer shroud disconnects, " V-" access that biasing circuit provides, make semiconductor laser tube LD reverse bias, accelerates and turn-off semiconductor laser tube LD fully.
When direct current or analog-modulated, the 3rd contact and the first contact are connected always, and modulated-analog signal, through after straight, as one of interior ring input, is controlled drive current.
As second embodiment, on the basis of the first embodiment, this stable LASER Light Source also comprises embedded type CPU, D/A converter, embedded type CPU is connected to an input end of first adder by D/A converter, embedded type CPU is controlled the D/A conversion, the Output optical power set-point, this set-point is adjustable.
As the 3rd embodiment, on the basis of the first embodiment, this stable LASER Light Source also comprises rectifier, embedded type CPU, A/D converter, when analog-modulated, the secondary signal generator is connected to an input end of first adder by rectifier, embedded type CPU, A/D converter, modulated-analog signal through the sampling of overcommutation, CPU, and the A/D conversion after, actual measurement modulation signal amplitude, the Output optical power set-point, this luminous power set-point is determined.
In above-mentioned three embodiment, luminous power is given, analog-modulated, digital modulation signals be respectively from different port inputs.The given system as outer shroud of luminous power is given, and no matter make is continuous laser, still has the laser of periodically modulating through analog or digital constant and stable output is arranged.Photoelectric tube PD can be packaged in one with semiconductor laser tube LD.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a Multi-wavelength laser power time division measurement method, a plurality of LASER Light Source output to measured piece through wave multiplexer, in measured piece is carried out to measuring light power, used the modulation /demodulation synchro control, use time-sharing procedure, carry out the Digital Modulation of LASER Light Source by the timesharing of modulation /demodulation synchro control, the synchronous demodulation of measuring light power end, and the laser power of measurement corresponding wavelength, under synchronizing signal is controlled, the LASER Light Source of different choosing period of time different wave lengths is as the excitation of test, at measuring junction, arrangement according to the different periods, isolate the laser of different wave length, and measure the luminous power of each wavelength, described modulation /demodulation synchro control is placed on measuring junction, combine and form the measuring light power structure with the measuring light power meter, it is characterized in that: described measuring light power structure comprises embedded type CPU, A/D converter, the synchronous modulation signal generator, N resistor chain in parallel, N+1 analog switch, with N N the low-pass filter that resistor chain is corresponding, operational amplifier, photoelectric tube, embedded type CPU, A/D converter, the synchronous modulation signal generator connects successively, a measurement port of photoelectric tube connects the fiber-optic output mouth of measured piece, synchronous modulation signal generator output modulation signal is to LASER Light Source, wherein, each resistor chain includes M resistance in parallel, gear shift for different ranges, the output terminal of each resistor chain M:1 analog switch of all connecting, concrete, wherein the second end of each resistance all is connected to a non-common port corresponding in the M:1 analog switch, a N:1 analog switch of input end series connection of operational amplifier, concrete, the input end of operational amplifier connects the common port of N:1 analog switch, the control end of described each M:1 analog switch and N:1 analog switch is all received the synchronous modulation signal generator, the common port of each M:1 analog switch all is connected to A/D converter, and then be connected to CPU and carry out power measurement, the non-common port of N:1 analog switch is connected respectively on the branch road between each M:1 analog switch common port and low-pass filter, the output terminal of operational amplifier is connected to photoelectric tube, the negative electrode of photoelectric tube is connected to the first end of resistance in each resistor chain simultaneously,
At first by embedded type CPU, controlled, output to the control end of N:1 analog switch by A/D converter, select corresponding passage, make this passage connect operational amplifier, form feedback channel, when channel selecting is " 0 ", the M:1 analog switch contract fully of this passage, when channel selecting is " 1 ", by embedded type CPU, control again, A/D converter outputs to the M:1 analog switch, and the switch of the corresponding range of gating records the laser power instantaneous value of this passage.
2. Multi-wavelength laser power time division measurement method according to claim 1, it is characterized in that: the common port of each M:1 analog switch all is connected to A/D converter by a low-pass filter, now, records the laser power mean value of this passage.
3. Multi-wavelength laser power time division measurement method according to claim 1 and 2, it is characterized in that: described LASER Light Source, comprise first adder, the optical power adjustment device, biasing circuit, second adder, driving/holding circuit, semiconductor laser tube LD, photoelectric tube PD, diode D, feedback factor K1f, K2f, and analog switch, the input end of first adder connects respectively the given negative feedback end with luminous power of luminous power, luminous power is given enters the light power governor with feedback luminous power after the first adder addition, analog switch has three contacts, the output terminal of optical power adjustment device connects the first contact, the second contact connects biasing circuit, the control end of digital modulation signals input analog switch, the 3rd contact is public contact, link an input end of second adder, another two input ends of second adder connect respectively input modulated-analog signal and current feedback, the output of second adder enters driving/holding circuit after current regulator, the output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD, semiconductor laser tube LD after feedback factor K2f as current feedback, the two ends of the semiconductor laser tube LD that diode D is connected in parallel on, the positive pole of diode D connects the negative pole of semiconductor laser tube LD, the positive pole of photoelectric tube PD connects the negative pole of semiconductor laser tube LD, the negative pole of photoelectric tube PD after feedback factor K1f as the negative feedback end of luminous power,
During Digital Modulation, when modulation signal is level"1", the 3rd contact and the first contact are connected, the laser that output amplitude is stable, during level "0", the 3rd contact and the first contact disconnect, and with the second contact, connect, the negative sense bias voltage access that biasing circuit provides, make semiconductor laser tube LD reverse bias;
When direct current or analog-modulated, the 3rd contact and the first contact are connected always.
4. Multi-wavelength laser power time division measurement method according to claim 3, it is characterized in that: this stable LASER Light Source also comprises embedded type CPU, D/A converter, embedded type CPU is connected to an input end of first adder by D/A converter.
5. Multi-wavelength laser power time division measurement method according to claim 3, it is characterized in that: this stable LASER Light Source also comprises rectifier, embedded type CPU, A/D converter, when analog-modulated, modulated-analog signal is connected to an input end of first adder by rectifier, embedded type CPU, A/D converter.
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| CN106406407A (en) * | 2016-11-16 | 2017-02-15 | 天津市盛丹电子技术发展有限公司 | Multi-range high-accuracy constant current source |
| CN108333138B (en) * | 2017-12-29 | 2021-06-11 | 天津先阳科技发展有限公司 | Multi-wavelength spectrum synchronous measurement method and device |
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