CN102564573A - Multi-wavelength laser power time division measurement method - Google Patents
Multi-wavelength laser power time division measurement method Download PDFInfo
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- CN102564573A CN102564573A CN2011104504795A CN201110450479A CN102564573A CN 102564573 A CN102564573 A CN 102564573A CN 2011104504795 A CN2011104504795 A CN 2011104504795A CN 201110450479 A CN201110450479 A CN 201110450479A CN 102564573 A CN102564573 A CN 102564573A
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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 multiwavelength laser power measurement method of the parameter measurement of optical communication passive device or equipment.
Background technology
The laser power measurement relevant with optical wavelength is the manufacturing, debugging, measuring fiber communication device or the modal measurement of equipment; Because light sensor (as: PIN pipe; APD pipe etc.) do not have wavelength selectivity, need wavelength separated and wavelength selection unit in the test macro.
Well-known test macro has following several kinds:
1, the measuring light power of discontinuous wavelength
In some the measuring light power occasions that need carry out discontinuous wavelength, following organization plan is arranged usually:
A) insert wavelength separated/selected cell (Fig. 1) behind the measured piece.
B) insert wavelength separated/selected cell (Fig. 2, Fig. 3) before the measured device.
Adopt interleaver as the wavelength separated unit in the above structure, and adopt photoswitch usually as wavelength selection unit.Photoswitch is owing to exist following shortcoming:
The repetitive error of photoswitch: >=0.05db;
Photoswitch switches slow, and time delay reaches a few tens of milliseconds;
The switch life of photoswitch is limited, is inappropriate for continuously switching repeatedly.
And the parameter measurement of optical communication passive device or equipment; As: multi-wavelength inserts loss, return loss, the isoparametric measurement of Polarization Dependent Loss; Require the relative accuracy of measuring system to be superior to 0.01dB; Therefore, high-precision measurement requirement can not be satisfied as the measuring system of selected cell, real-time measurement requirement can not be satisfied with photoswitch.
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 is carried out the measurement of continuous spectrum.But,, need the several seconds usually because Wavelength stabilized and spectral scan is consuming time quite long.So, also can't satisfy real-time measurement requirement.
Summary of the invention
The technical matters that the present invention will solve provides a kind of multiwavelength laser power time-division measuring method, is applicable to the parameter measurement of optical communication passive device or equipment, and can satisfy high precision and real-time measurement requirement.
The present invention adopts following technical scheme to solve the problems of the technologies described above: a kind of multiwavelength laser power time-division measuring method, and a plurality of LASER Light Sources output to measured piece through wave multiplexer, and measured piece is being carried out in the measuring light power; Use the modulation synchro control, used time-sharing procedure, carried out the digital modulation of LASER Light Source through the timesharing of modulation synchro control; The synchronous demodulation of measuring light power end; And the laser power of measurement corresponding wavelength, promptly under synchronizing signal control, the different periods are selected the excitation of different wavelength of laser light sources as test; At measuring junction; According to the arrangement of different periods, isolate different wavelength of laser, and measure the luminous power of each wavelength.
This invention further is specially:
Said modulation synchro control is placed on the excitation end.
Perhaps said modulation synchro control is placed on measuring junction, combines with the measuring light power meter and forms the measuring light power structure.
As an example; Said measuring light power structure comprise embedded type CPU, A/D converter, synchronous modulation signal generator, parallel connection N resistor chain, 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 given LASER Light Source; Wherein, each resistor chain includes M parallel resistor, is used for the gear shift of different ranges; The output terminal of each resistor chain M:1 analog switch of all connecting; Concrete, wherein second end of each resistance all is connected to corresponding in a M:1 analog switch non-common port, 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, and the control end of said 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; 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 the low-pass filter, and the output terminal of operational amplifier is connected to photoelectric tube, and the negative electrode of photoelectric tube is connected to first end of resistance in each resistor chain simultaneously;
At first by embedded type CPU control, output to the control end of N:1 analog switch through 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 is when channel selecting is " 1 ", again through embedded type CPU control; 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 last embodiment, the common port of each M:1 analog switch can also all be connected to A/D converter through a low-pass filter, at this moment, records the laser power mean value of this passage.
As another embodiment; Said 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 given LASER Light Source; The negative electrode of photoelectric tube connects the common port of 1:N analog switch, and the non-common port of the N of 1:N analog switch connects a programmable amplifier respectively, is connected to A/D converter through a low-pass filter behind each programmable amplifier; Then be connected to embedded type CPU and carry out measuring light power, the control end of said 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 control, output to the control end of 1:N analog switch through A/D converter, select corresponding passage; When channel selecting was " 0 ", the programmable amplifier contract fully of this passage was when channel selecting is " 1 "; Through embedded type CPU control, A/D converter outputs to programmable amplifier, the corresponding range of gating again; Behind LPF, what record is the laser power mean value of this passage.
Described LASER Light Source; Comprise first adder, 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 the given negative feedback end with luminous power of luminous power respectively; The given feedback with luminous power of luminous power is through the laggard light inlet power governor of first adder addition; Analog switch has three contacts, and the output terminal of optical power adjustment device connects first contact, 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, two input ends in addition of second adder connect input modulated-analog signal and current feedback respectively, and the output of second adder gets into driving/holding circuit behind current regulator; The output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD; Semiconductor laser tube LD through behind the 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 behind feedback factor K1f as the negative feedback end of luminous power;
During digital modulation, when modulation signal was level"1", the 3rd contact and first contact were connected; The laser that output amplitude is stable; During level "0", the 3rd contact and first contact break off, and connect with second contact; The negative sense bias voltage that biasing circuit provides inserts, and makes semiconductor laser tube LD reverse bias;
When direct current or analog-modulated, the 3rd contact and 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 through 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 through 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: insert loss, return loss, Polarization Dependent Loss or the like.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 appearance, and instruments such as Polarization Dependent Loss measuring instrument can satisfy the high precision of these devices or equipment and real-time measurement requirement;
2, in the manufacturing process of optical-fibre communications device, for the monitoring in real time of multi-wavelength light power provides online detection means, for the utilization of feedback control technology provides condition;
3, avoid the selection and the switching of wavelength, simplify the multi-wavelength test operation of optical-fibre communications device or equipment;
4, cost is low, and efficient is high.
Description of drawings
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 multiwavelength laser power time-division measuring method of the present invention.
Fig. 5 is a principle of the invention scheme oscillogram.
Fig. 6 is the structure principle chart of first embodiment of the measuring light power structure among the present invention.
Fig. 7 is the structure principle chart of second embodiment of the measuring light power structure among the present invention.
Fig. 8 is the structure principle chart of the 3rd embodiment of the measuring light power structure among the present invention.
Fig. 9 is the structure principle chart of the LASER Light Source that uses among the present invention.
Embodiment
See also Fig. 4, multiwavelength laser power time-division measuring method of the present invention comprises a plurality of LASER Light Sources, wave multiplexer, measuring light power meter and modulation isochronous controller.
The output terminal of the adjusting termination modulation isochronous controller of each LASER Light Source in said a plurality of LASER Light Source; The output terminal of each LASER Light Source is received the corresponding input end mouth 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 isochronous controller is connected with the measuring light power meter simultaneously.
This patent multiwavelength laser power measurement utilization time-sharing procedure carries out the digital modulation of LASER Light Source through the timesharing of modulation isochronous controller, the synchronous demodulation of measuring light power end, and measure the laser power of corresponding wavelength.
Said demodulation among the present invention is meant that under synchronizing signal control, the different periods are selected the excitation of different wavelength of laser light source as test; At measuring junction,, isolate different wavelength of laser, and measure the luminous power of each wavelength according to the arrangement of different periods.
Modulation isochronous controller among the present invention can be used as individual components, also can make up with measuring light power meter or LASER Light Source, to be combined as preferably with measuring light power.When modulation isochronous controller and the combination of measuring light power meter, be about to the modulation synchro control and be placed on measuring junction, when modulation isochronous controller and LASER Light Source combination, be about to the modulation synchro control and be placed on the excitation end.
Principle scheme oscillogram of the present invention is seen Fig. 5, and among Fig. 5, the output of each LASER Light Source is with input modulating signal is synchronous 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 the different similar waveform of laser power amplitude with output B.T is called the dead band, prevents cross interference.
With reference to Fig. 5, the computation process that said LASER Light Source closes the luminous power calculating that luminous power is calculated, B is ordered that the A behind the ripple orders and optical power loss, average light power is described below:
1. establish: amplitude is A, and the cycle is T, and pulsewidth is τ, and time variable is t.
Then 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 the formula: m is the cycle ordinal number, and u (t) is a unit-step function.(down together, slightly)
If: pulse delay is σ.
Order: t=x-σ, substitution (1) formula; Behind the substitution of variable, use the former formula of t=x substitution again.
:
f(t,?σ)=A∑{u[t-σ-(m-1)T]-?u[t-τ-σ-(m-1)T]}?(?m=1,2,……)?......(2)
If: A=1, the dead band is δ, n is passage ordinal number: n=1,2 ... N (down together, slightly)
Then: σ=(n-1) (τ+δ) substitution (2) formula:
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. suppose: wave multiplexer is desirable device, decays to 0, and the luminous power expression formula that A is ordered is:
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, get P λ n, (n=1,2 ... N)
7. the computing formula of average light power:
Pavgλi=?Pλi*τ/T。
8. inserting loss calculates:
ILλi=?-10*Log[(Kλi*Pλi)/?Pλi]
=?-10*Log[Kλi?] (i=1,2…N)
, be the structure principle chart of first embodiment of the measuring light power structure among the present invention please with reference to Fig. 6.It is the measuring light power structure that the function with modulation synchro control and measuring light power combines.
Said measuring light power structure comprise embedded type CPU, A/D converter, synchronous modulation signal generator, parallel connection N resistor chain, 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 given LASER Light Source.
Wherein, each resistor chain includes M parallel resistor, is used for the gear shift of different ranges; Divide 8 grades like 10dBm---70dBm, the output terminal of each resistor chain M:1 analog switch of all connecting, concrete; Wherein second end of each resistance all is connected to corresponding in a M:1 analog switch non-common port, and N:1 analog switch of input end series connection of operational amplifier is 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 said 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 through a low-pass filter, and then is connected to CPU and carries 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 the low-pass filter.The output terminal of operational amplifier is connected to photoelectric tube, and the negative electrode of photoelectric tube is connected to first end of resistance in each resistor chain simultaneously.
The course of work of this measuring light power structure is described below:
At first by embedded type CPU control, output to the control end of N:1 analog switch through 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 is when channel selecting is " 1 ", again through embedded type CPU control; A/D converter outputs to the M:1 analog switch, the switch of the corresponding range of gating.Behind LPF, what record is the laser power mean value of this passage n (corresponding wavelength λ n).
, be the structure principle chart of second embodiment of the measuring light power structure among the present invention please with reference to Fig. 7.
Said 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 given 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 a programmable amplifier respectively; Be connected to A/D converter through a low-pass filter behind each programmable amplifier, be connected to embedded type CPU then and carry out measuring light power.The control end of said 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 described below:
At first by embedded type CPU control, output to the control end of 1:N analog switch through A/D converter, select corresponding passage; When channel selecting is " 0 "; The programmable amplifier contract fully of this passage is when channel selecting is " 1 ", again through embedded type CPU control; A/D converter outputs to programmable amplifier, the corresponding range of gating.Behind LPF, what record is the laser power mean value of this passage n (corresponding wavelength λ n).
, be the structure principle chart of the 3rd embodiment of the measuring light power structure among the present invention please with reference to Fig. 8.The difference of this embodiment and above-mentioned first embodiment is, is directly connected to A/D converter behind the M:1 analog switch, does not have low-pass filter, and at this moment, what record is the laser power instantaneous value of this passage n (corresponding wavelength λ n).
See also shown in Figure 9; Be the structure principle chart of the LASER Light Source that uses 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 the given negative feedback end with luminous power of luminous power respectively; The given feedback with luminous power of luminous power is through the laggard light inlet power governor of first adder addition; Analog switch has three contacts, and the output terminal of optical power adjustment device connects first contact, and second contact connects biasing circuit; First signal generator connects the control end of analog switch; The 3rd contact is the input end that public contact is linked second adder, and two input ends in addition of second adder connect secondary signal generator and current feedback terminal respectively, and the output of second adder gets into driving/holding circuit behind current regulator; The output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD; Semiconductor laser tube LD through behind the 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 behind feedback factor K1f and low-pass filter as the negative feedback end of luminous power.
Can be found out that by Fig. 9 and above-mentioned annexation said stable LASER Light Source is made up of two closed loops: interior ring is an electric current loop, through the sample circuit negative feedback of the drive current of semiconductor laser tube LD, and the drive current of control semiconductor laser tube LD; Outer shroud is the luminous power ring, through the sample circuit negative feedback of photoelectric tube PD, and the control laser power.
The effect of each parts is described below:
Wherein first signal generator provides digital modulation signals, and the secondary signal generator provides modulated-analog signal, and at this moment, digital modulation signals and modulated-analog signal produce by this LASER Light Source is inner.Certainly, also can be with an external modulation interface of input end of the control port and the second adder of analog switch, thus obtain digital modulation signals and modulated-analog signal from the 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 electric current is given as 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 alternately switch, and when direct current or analog quantity modulation, the 3rd contact and 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 the current regulator, isolated digital signal and system signal, avoided the influence of digital level fluctuation degree of stability.
Driving/holding circuit has defencive functions such as overcurrent, short circuit, back-pressure, the slow startup of start except that electric current amplifies.
The course of work of this LASER Light Source is described below:
During digital modulation, when modulation signal was level"1", the double loop system loop was connected; The laser that output amplitude is stable, during level "0", outer shroud breaks off; " V-" that biasing circuit provides inserts, and makes semiconductor laser tube LD reverse bias, accelerates and turn-offs semiconductor laser tube LD fully.
When direct current or analog-modulated, the 3rd contact and first contact are connected always, and modulated-analog signal is through after straight, as one of interior ring input, controlling and driving electric current.
As second embodiment; On the basis of first embodiment; 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 through D/A converter, embedded type CPU control D/A conversion; The Output optical power set-point, this set-point is adjustable.
As the 3rd embodiment, on the basis of 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 through 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 confirmed.
Among 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 all arranged.Photoelectric tube PD can be packaged in one with semiconductor laser tube LD.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. multiwavelength laser power time-division measuring method is characterized in that: a plurality of LASER Light Sources output to measured piece through wave multiplexers, and measured piece is being carried out in the measuring light power; Use the modulation synchro control, used time-sharing procedure, carried out the digital modulation of LASER Light Source through the timesharing of modulation synchro control; The synchronous demodulation of measuring light power end, and the laser power of measurement corresponding wavelength are promptly under synchronizing signal control; The different periods are selected the excitation of different wavelength of laser light source as test, at measuring junction, according to the arrangement of different periods; Isolate different wavelength of laser, and measure the luminous power of each wavelength.
2. multiwavelength laser power time-division measuring method according to claim 1 is characterized in that: said modulation synchro control is placed on the excitation end.
3. multiwavelength laser power time-division measuring method according to claim 1 is characterized in that: said modulation synchro control is placed on measuring junction, combines with the measuring light power meter and forms the measuring light power structure.
4. multiwavelength laser power time-division measuring method according to claim 3; It is characterized in that: said measuring light power structure comprise embedded type CPU, A/D converter, synchronous modulation signal generator, parallel connection N resistor chain, 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 given LASER Light Source; Wherein, each resistor chain includes M parallel resistor, is used for the gear shift of different ranges; The output terminal of each resistor chain M:1 analog switch of all connecting; Concrete, wherein second end of each resistance all is connected to corresponding in a M:1 analog switch non-common port, 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, and the control end of said 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; 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 the low-pass filter, and the output terminal of operational amplifier is connected to photoelectric tube, and the negative electrode of photoelectric tube is connected to first end of resistance in each resistor chain simultaneously;
At first by embedded type CPU control, output to the control end of N:1 analog switch through 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 is when channel selecting is " 1 ", again through embedded type CPU control; 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.
5. multiwavelength laser power time-division measuring method according to claim 4 is characterized in that: the common port of each M:1 analog switch all is connected to A/D converter through a low-pass filter, at this moment, records the laser power mean value of this passage.
6. multiwavelength laser power time-division measuring method according to claim 3; It is characterized in that: said 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 given LASER Light Source; The negative electrode of photoelectric tube connects the common port of 1:N analog switch, and the non-common port of the N of 1:N analog switch connects a programmable amplifier respectively, is connected to A/D converter through a low-pass filter behind each programmable amplifier; Then be connected to embedded type CPU and carry out measuring light power, the control end of said 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 control, output to the control end of 1:N analog switch through A/D converter, select corresponding passage; When channel selecting was " 0 ", the programmable amplifier contract fully of this passage was when channel selecting is " 1 "; Through embedded type CPU control, A/D converter outputs to programmable amplifier, the corresponding range of gating again; Behind LPF, what record is the laser power mean value of this passage.
7. according to each described multiwavelength laser power time-division measuring method of claim 1 to 6; It is characterized in that: described LASER Light Source; Comprise first adder, 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 the given negative feedback end with luminous power of luminous power respectively; The given feedback with luminous power of luminous power is through the laggard light inlet power governor of first adder addition; Analog switch has three contacts, and the output terminal of optical power adjustment device connects first contact, 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, two input ends in addition of second adder connect input modulated-analog signal and current feedback respectively, and the output of second adder gets into driving/holding circuit behind current regulator; The output terminal of driving/holding circuit is connected to the positive pole of semiconductor laser tube LD; Semiconductor laser tube LD through behind the 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 behind feedback factor K1f as the negative feedback end of luminous power;
During digital modulation, when modulation signal was level"1", the 3rd contact and first contact were connected; The laser that output amplitude is stable; During level "0", the 3rd contact and first contact break off, and connect with second contact; The negative sense bias voltage that biasing circuit provides inserts, and makes semiconductor laser tube LD reverse bias;
When direct current or analog-modulated, the 3rd contact and first contact are connected always.
8. multiwavelength laser power time-division measuring method according to claim 7 is characterized in that: 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 through D/A converter.
9. multiwavelength laser power time-division measuring method according to claim 7; 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 through rectifier, embedded type CPU, A/D converter.
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