CN103970165B - For the control method that double-wave-length orthogonal polarization light polarization stability controls - Google Patents
For the control method that double-wave-length orthogonal polarization light polarization stability controls Download PDFInfo
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Abstract
A kind of control method controlled for double-wave-length orthogonal polarization light polarization stability, its scheme is: 1) set one with reference to rise folk prescription to, 2) current folk prescription of double-wave-length orthogonal polarization light is played folk prescription to comparing in real time to reference, current the folk prescription calculating double-wave-length orthogonal polarization light to with reference to rise folk prescription to angle a, 3) according to the size of angle a, employing Polarization Controller to regulating, makes angle a reduce a folk prescription of double-wave-length orthogonal polarization light; 4) repeat step 2), 3) operation, make the numerical value of angle a converge on 0.Advantageous Effects of the present invention is: propose a kind of control method being suitable for double-wave-length orthogonal polarization light polarization stability and controlling.
Description
Technical field
The present invention relates to a kind of polarization control technology, particularly relate to a kind of control method controlled for double-wave-length orthogonal polarization light polarization stability.
Background technology
Polarisation of light state is one of four large key parameters of light (frequency, phase place, amplitude and polarization state), polarization state refers to the skewed popularity of light its energy distribution in communication process, when Free propagation, polarisation of light state can occur to change immediately because of the impact of the factor such as environment temperature, stress, and the change of this polarization state has great impact to field of high-speed optical communications, light sensory field and polarization relevant apparatus that some are special.
At high-speed light communication field, be correlated with gain amplifier and palarization multiplexing etc. of the polarization associated modulation occurred in recent years, polarization all requires that light signal has in transmitting procedure and stablizes constant polarization state, and therefore Polarization Control has extremely important effect; On the other hand, along with the breakthrough of optical fiber sensing technology, be widely applied in the every field of optical fiber sensing system in national economy, as one of the important demodulation method of the transducing signal such as phase place, frequency displacement, coherent detection becomes the core technology in the field such as temperature stress distributed sensing, angular velocity sensing, coherent detection requires that two coherent lights must have stable polarization relation, stable interference signal could be obtained export, so the polarization state stability control of light signal is the key component of coherent detection.
Double-wave-length orthogonal polarization laser instrument obtains and applies more and more widely in recent years, the feature of this laser instrument is that the light signal that it exports comprises two wavelength differences but the light signal that wavelength interval is adjustable, power is substantially equal, and the polarization state of two wavelength light always keeps the orthogonality relation of 90 degree simultaneously.Utilize this laser instrument can realize the several functions such as light generation, the generation of optics random waveform of any microwave signal, these functions are significant for Microwave photonics field, but, the polarization state that the prerequisite completing these functions remains pairwise orthogonal polarized light must keep stable.In actual applications, when these two crossed polarized lights that laser instrument exports transmit in single-mode fiber, be subject to the impact of the environmental factor such as stress, temperature equally, the polarization of two light signals is while maintenance orthogonality relation, synchronous polarization variations can occur, and this just have impact on the application of this laser instrument in a lot of field.
Existing polarization control method is only applicable to control Single wavelength list polarization state light, its basic reason is: existing polarization control method needs to rely on luminous power to obtain polarization error amount, because double-wave-length orthogonal polarization light exists orthogonal polarization relationship, the luminous power of the light signal that the polarizer exports can not change along with the polarization variations of crossed polarized light, therefore luminous power cannot be relied on to detect and to get polarization error amount, naturally also just cannot realize controlling the stability of its polarization state.
Summary of the invention
For the problem in background technology, the present invention proposes a kind of control method controlled for double-wave-length orthogonal polarization light polarization stability, it is characterized in that: 1) set one with reference to rise folk prescription to, 2) current folk prescription of double-wave-length orthogonal polarization light is played folk prescription to comparing in real time to reference, current the folk prescription calculating double-wave-length orthogonal polarization light to with reference to rise folk prescription to angle α, 3) according to the size of angle α, employing Polarization Controller to regulating, makes angle α reduce a folk prescription of double-wave-length orthogonal polarization light; 4) repeat step 2), 3) operation, make the numerical value of angle α converge on 0.
Principle of the present invention is: in the process studied double-wave-length orthogonal polarization light, inventor tastes the existing polarization control method of pilot production and carries out Polarization Control to double-wave-length orthogonal polarization light, but in experimentation, inventor finds that the luminous power of picking up is a constant, the Polarization Control means detected based on luminous power cannot be adopted to control double-wave-length orthogonal polarization polarisation of light state, so inventor has carried out deep theoretical analysis to the transport property of double-wave-length orthogonal polarization light in existing polarization control system, and found following content: known based on existing theory, in the interconnective polarizer and polarization maintaining optical fibre, a folk prescription of the polarizer is to consistent with some axles of polarization maintaining optical fibre, suppose that this axle is the fast axle of polarization maintaining optical fibre, then polarization direction, play folk prescription, to the position relationship with polarization maintaining optical fibre fast and slow axis, (λ in figure can be shown by Fig. 2
1and λ
2the light of two kinds of wavelength in band table double-wave-length orthogonal polarization light, α is the angle of double-wave-length orthogonal polarization polarisation of light direction and the intrinsic polarization direction of the polarizer), under α angle conditions, two crossed polarized lights are through projection mapping, namely finally project to the polarizer to play the light of folk prescription on (also fast axle) and will export from the polarizer, and play folk prescription with the polarizer and will be cut off stop to the light of vertical (namely parallel with slow axis) and cannot export, from the polarizer export light after photodetector carries out opto-electronic conversion, the electric signal that its optical beat produces can be represented by the formula:
In formula,
for the responsiveness of photodetector; P
1and P
2for the luminous power of the light of two kinds of wavelength in double-wave-length orthogonal polarization light; ω
1and ω
2it is the frequency that the light of two kinds of wavelength is corresponding;
Due to almost equal (the i.e. P of the luminous power of two wavelength light in double-wave-length orthogonal polarization light
1=P
2), so in above formula
item is constant, and its value can not change along with the change of α, so it is infeasible for relying on luminous power to detect polarization error signal.After having found to cause luminous power to detect the reason lost efficacy, inventor has found again further, from above formula
item can be found out, circular frequency is ω
1-ω
2ac signal (also can be called radiofrequency signal) amplitude (namely
) can change along with the change of α, indirectly can be reflected the variation tendency of polarization direction thus by the variable quantity of detection signal amplitude, thus carry out corresponding negative-feedback regu-lation, so the solution of the present invention has just been arisen at the historic moment.
As can be seen from aforementioned schemes we, Polarization Control is carried out to double-wave-length orthogonal polarization light and needs two conditions, one is the invariable reference direction in acquisition direction, it is two for calculating the angle (also can be described as error) between double-wave-length orthogonal polarization light and reference direction, what first inventor expected is exactly the polarizer, for a certain concrete polarizer, its intrinsic folk prescription is to being invariable, simultaneously, the polarizer can also be selected the light in different polarization direction, this characteristic of the polarizer extremely caters to aforementioned schemes, after adopting the polarizer to process double-wave-length orthogonal polarization light to be modulated, naturally the angle information between double-wave-length orthogonal polarization light and reference direction is just carried in the output light of the polarizer, carry out opto-electronic conversion by exporting light to the polarizer and pick up its beat frequency information, just can judge corner dimension and variation tendency thereof from the amplitude size of electric signal and variation tendency thereof, thus make follow-up compensatory control possess realization condition,
About compensatory control part: the object that polarization stability controls makes double-wave-length orthogonal polarization polarisation of light direction keep stable, this " stablizing " does not need double-wave-length orthogonal polarization polarisation of light direction to keep constant, as long as it converges on a fixed-direction and only reciprocating vibration among a small circle, this is identical with the object of negative feedback control common in machine field, therefore inventor adopts negative feedback compensatory control to realize the automatic control to double-wave-length orthogonal polarization light polarization stability.
Preferably, employing photodetector extracts the beat frequency information in aforementioned polarizer output light.
Advantageous Effects of the present invention is: propose a kind of control method being suitable for double-wave-length orthogonal polarization light polarization stability and controlling.
Accompanying drawing explanation
Fig. 1, principle schematic based on a kind of control system of the present invention program;
Fig. 2, double-wave-length orthogonal polarization polarisation of light direction and the polarizer rise folk prescription to graph of a relation;
In figure, each title corresponding to mark is respectively: double-wave-length orthogonal polarization laser instrument 1, Polarization Controller 2, protect inclined shunt 3, the polarizer 4, photodetector 5, wave detector 6, signal processing system 7.
Embodiment
A kind of control method controlled for double-wave-length orthogonal polarization light polarization stability, its scheme is: 1) set one with reference to rise folk prescription to, 2) current folk prescription of double-wave-length orthogonal polarization light is played folk prescription to comparing in real time to reference, current the folk prescription calculating double-wave-length orthogonal polarization light to with reference to rise folk prescription to angle α, 3) according to the size of angle α, employing Polarization Controller to regulating, makes angle α reduce a folk prescription of double-wave-length orthogonal polarization light; 4) repeat step 2), 3) operation, make the numerical value of angle α converge on 0.
Further, step 1) in, with intrinsic folk prescription of a polarizer to rise as a reference folk prescription to; Step 2) in, extract the beat frequency information in aforementioned polarizer output light, in beat frequency information, contain the information of angle α.
Further, step 3) in, adopt negative feedback compensatory control automatically to control Polarization Controller.
Further, step 2) in, employing photodetector extracts the beat frequency information in aforementioned polarizer output light.
Implement for the ease of those skilled in the art, the invention also discloses following a kind of concrete double-wave-length orthogonal polarization light polarization stabilitrak:
Described polarization stability control system is made up of the inclined shunt 3 of the guarantor of Polarization Controller 2, single-input double-output, the polarizer 4, photodetector 5, wave detector 6 and signal processing system 7;
The output terminal of described double-wave-length orthogonal polarization laser instrument 1 is connected with the input end light path of Polarization Controller 2; The output terminal of Polarization Controller 2 is connected with the input end light path of protecting inclined shunt 3; The first output terminal protecting inclined shunt 3 forms the output terminal of polarization control system, outside output dual wavelength crossed polarized light; Protect between the second output terminal of inclined shunt 3 and the input end of the polarizer 4 and be connected by polarization maintaining optical fibre light path; Be connected by polarization maintaining optical fibre light path between the output terminal of the polarizer 4 and the input end of photodetector 5; The output terminal of photodetector 5 is connected with the input end of wave detector 6; The output terminal of wave detector 6 is connected with signal processing system 7; Signal processing system 7 is electrically connected with the control part of Polarization Controller 2;
Described double-wave-length orthogonal polarization laser instrument 1 is for exporting double-wave-length orthogonal polarization light to be modulated;
The control signal that described Polarization Controller 2 can export according to signal processing system 7 carries out dynamic adjustments to the double-wave-length orthogonal polarization polarisation of light state that double-wave-length orthogonal polarization laser instrument 1 exports;
The inclined shunt 3 of described guarantor is for being divided into two-way by the output light of Polarization Controller 2, and wherein a road light outwards exports application end to, and another road light is for extracting double-wave-length orthogonal polarization polarisation of light error;
The intrinsic polarization direction of the described polarizer 4 as 0 degree of polarization direction, with the control information of double-wave-length orthogonal polarization light and 0 degree of polarization direction in the output light of the polarizer 4;
Described photodetector 5 is for being converted to electric signal by light signal, and meanwhile, photodetector 5 also picks up the beat signal in light signal;
Described wave detector 6 amplifies process for carrying out detection to input signal;
The variable quantity that described signal processing system 7 can output signal according to wave detector 6, adopts negative feedback control principle to carry out dynamic adjustments to the running parameter of Polarization Controller 2, makes the output signal of wave detector 6 converge on the steady state value of a setting.
Preferably, the first output terminal of the inclined shunt 3 of described guarantor and the splitting ratio of the second output terminal are 95:5.
Claims (3)
1. for the control method that double-wave-length orthogonal polarization light polarization stability controls, it is characterized in that: 1) set one with reference to playing folk prescription to, step 1) in, with intrinsic folk prescription of a polarizer to rise as a reference folk prescription to; 2) current folk prescription of double-wave-length orthogonal polarization light is played folk prescription to comparing in real time to reference, calculate current folk prescription of double-wave-length orthogonal polarization light to the angle α with the intrinsic polarization direction of the polarizer, step 2) in, extract the beat frequency information in aforementioned polarizer output light, in beat frequency information, contain the information of angle α; 3) according to the size of angle α, employing Polarization Controller to regulating, makes angle α reduce a folk prescription of double-wave-length orthogonal polarization light; 4) repeat step 2), 3) operation, make the numerical value of angle α converge on 0.
2. the control method controlled for double-wave-length orthogonal polarization light polarization stability according to claim 1, is characterized in that: step 3) in, adopt negative feedback compensatory control automatically to control Polarization Controller.
3. the control method controlled for double-wave-length orthogonal polarization light polarization stability according to claim 1, is characterized in that: step 2) in, employing photodetector extracts the beat frequency information in aforementioned polarizer output light.
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| CN201147318Y (en) * | 2007-10-12 | 2008-11-12 | 中国人民解放军第三军医大学野战外科研究所 | Right angle intersection double polarizing lights non-invasive blood sugar measuring apparatus |
| CN102044835A (en) * | 2010-12-09 | 2011-05-04 | 中国电子科技集团公司第四十四研究所 | Narrow-pulse polarization controller |
| CN102980434A (en) * | 2008-04-18 | 2013-03-20 | S·M·尼尔松 | Channel system |
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|---|---|---|---|---|
| CN201147318Y (en) * | 2007-10-12 | 2008-11-12 | 中国人民解放军第三军医大学野战外科研究所 | Right angle intersection double polarizing lights non-invasive blood sugar measuring apparatus |
| CN102980434A (en) * | 2008-04-18 | 2013-03-20 | S·M·尼尔松 | Channel system |
| CN102044835A (en) * | 2010-12-09 | 2011-05-04 | 中国电子科技集团公司第四十四研究所 | Narrow-pulse polarization controller |
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| 《1053nm单频线偏振光纤激光器》;刑美术等;《光纤与电缆及其应用技术》;20080225(第1期);第9-11页 * |
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