CN102440762B - Method and system for stabilizing frequency by interference phase parameter calibration feedback regulation and control - Google Patents
Method and system for stabilizing frequency by interference phase parameter calibration feedback regulation and control Download PDFInfo
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- CN102440762B CN102440762B CN201110269652.1A CN201110269652A CN102440762B CN 102440762 B CN102440762 B CN 102440762B CN 201110269652 A CN201110269652 A CN 201110269652A CN 102440762 B CN102440762 B CN 102440762B
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Abstract
The invention provides a method for stabilizing frequency by interference phase parameter calibration feedback regulation and control, which comprises the following steps of: introducing the laser light output by a sweep frequency laser system into an interference module through the rear part of a coupler module for light splitting interference and coupling; converting an interference light signal into an electric signal by a detector module; transmitting the electric signal to a data acquisition module for converting into data; processing the data by a data processing module to obtain an interference phase parameter; comparing the interference phase parameter with a calibration reference value to obtain a deviation value as a frequency stabilization regulation and control feedback signal value; calculating a filter regulation and control parameter regulation and control quantity; finally, regulating and controlling the filter by a filter parameter regulation and control performing module according to the regulation and control quantity. According to the method and the system provided by the invention, the change value of the sweep frequency laser interference phase parameter can be quickly measured, so that real-time monitoring of the sweep frequency laser tuning frequency drift phenomenon, quick response for the sweep frequency laser tuning frequency drift and frequency stabilization output are realized, and the filter is regulated and controlled.
Description
Technical field
The present invention relates to sweeping laser technical field and optical coherent chromatographic imaging field, especially relate to a kind of phase parameter calibration feedback regulation of sweeping laser interference that utilizes and sweeping laser is carried out to method and the frequency stabilization system of frequency stabilization.
Background technology
In recent years, sweeping laser more and more comes into one's own in research and the application and development in optical coherent chromatographic imaging (Optical Coherence Tomography is called for short OCT) field.OCT is the emerging technology in biomedical imaging field, has the distinct advantages such as not damaged, high-resolution, in field of ophthalmology, cardiovascular based endoscopic imaging field etc., is progressively used widely.OCT technology has been passed through the development of time domain, spectral domain (frequency domain) technological phase, latest generation high-performance OCT adopts sweeping laser as system source, utilize the characteristic of the scanning of sweeping laser fast frequency, high spectral resolution, detection rates and the imaging resolution of OCT system have greatly been promoted, make OCT Real-time Two-dimensional, three-dimensional imaging have more realizability, really possess the function of clinical " optical microphotograph vivisection imaging ".
Through research, the frequency-sweeping laser source that is applied to OCT system has produced a few class technical implementation way.The Bouma group of Harvard University, has developed the frequency-sweeping laser source based on grating and polygonal rotating mirror tuned filter; Ding Zhihua group of China Zhejiang University has also developed the hyperfine tuned filter frequency-sweeping laser source (patent application number: 201010108236.9) based on double grating and polygonal rotating mirror.The light source package as tuning filtering device that this class contains polygonal rotating mirror, all faces the unstable unsettled problem of sweeping laser output phase of bringing of polygonal mirror running accuracy; And with the swept light source of free-space structure tuned filter, volume is larger, light path is subject to ectocine, and the use that can make a search in laboratory is but not suitable for being developed to good stability, portable high swept light source module product.The Fujimoto group of masschusetts, u.s.a Polytechnics (MIT) and the Chen group of University of California etc., developed based on optical fiber Fabry Perot tuned filter (fiber Fabry-Perot tunable filter, FFP-TF) swept light source, this technic relization scheme compact conformation, but in application, face the tuned frequency drift instability problem of key obstacle a: FFP-TF.Experiment shows, the main cause that affects the drift of FFP-TF tuned frequency is environmental change factor, particularly variations in temperature factor.Variations in temperature by ambient temperature changes and the device heating of FFP-TF own causes, all can affect the voltage response characteristic of FFP-TF driving mechanism, thereby tuned frequency is drifted about.
Therefore, how on FFP-TF scheme basis, realizing effective tuned frequency frequency stabilization, is that this type of frequency-sweeping laser source can really be applied to the clinical key by OCT system.
Summary of the invention
In order to solve the above-mentioned technical problem existing in prior art, the invention provides and a kind ofly utilize sweeping laser output interference of light to obtain specific phase parameter to calibrate, and utilize calibration parameter light-source system to be carried out to the method for reaction type regulation and control frequency stabilization.
The present invention also provides a kind of frequency stabilization system based on above-mentioned regulation and control frequency-stabilizing method.
The present invention solves the technical scheme that prior art problem adopts:
An interferometric phase parameter calibration feedback regulation frequency-stabilizing method, the method comprises the following steps: the first step, coupler module is divided into two-way by the laser of sweeping laser system output, and wherein a road laser continues output, and another road laser enters intervention module; Second step, described intervention module is carried out spectral interference coupling to the laser entering; The 3rd step, detector module is converted into the signal of telecommunication by interference light signal, and outputs to data acquisition module; The 4th step, described data acquisition module is converted into data by the interference light signal of telecommunication gathering and store, and outputs to data processing module; The 5th step, described data processing module is processed according to carrying out interference light electrical signal data, obtain interferometric phase parameter and calibrate parameter value as phase place, and compare with demarcation reference point, obtain deviate between the two, and deviate is regulated and controled to feedback signal value as frequency stabilization, and calculate filter regulation and control parameter regulation and control amount according to deviate; The 6th step, filter parameter regulation and control Executive Module regulates and controls the work parameter of filter according to described filter regulation and control parameter regulation and control amount, realizes described sweeping laser system frequency stabilization output.
Described intervention module includes the first fiber coupler, the second fiber coupler, the first optical fiber and the second optical fiber, described the first fiber coupler is divided into two-way light by the laser entering again, and through described first optical fiber of different optical path lengths and the second optical fiber transmission, delivers to described the second fiber coupler respectively and interfere, be coupled.
During described sweeping laser system operation, the start time signal of the time cycle of filter frequency sweep is outputed to described data acquisition module simultaneously, and be converted in the lump data with described interference light signal, output to data processing module.
Described coupler module is divided into two-way laser by the laser of described sweeping laser system output, and wherein a road laser continues output as light source Output of laser, and another road laser enters described intervention module.
Described data processing module calculates after interferometric phase parameter, it is calibrated to parameter value as phase place, and contrast with demarcation reference point, also carry out the whether judgement in allowed band of both deviates, make maintenance when pre-filter running parameter, or calculate filter regulation and control parameter regulation and control amount and filter carried out to the selection of frequency stabilization regulation and control by described regulation and control Executive Module according to deviate.
The data handling procedure of described data processing module comprises the following steps: the first step, intercepts the interference light signal data of the continuous time series of any segment length in the data segment of described data processing module in a frequency sweep cycle; Second step, does Hilbert transform to each data in the data segment of intercepting and processes; The 3rd step, extracts corresponding real part data and imaginary data according to the Hilbert transform expression-form of each data point; The 4th step, real part data and the imaginary data corresponding according to each Hilbert transform value, calculate corresponding phase place, obtains thus the phase data sequence corresponding to interference light signal data sequence; The 5th step, utilizes phase unwrapping algorithm to carry out phase unwrapping processing to phase data sequence; The 6th step, phase unwrapping is processed and is obtained a total phase place, the phase place calibration parameter using this total phase parameter as data processing method; The 7th step, in the situation that sweeping laser system is carried out frequency stabilization regulation and control, will obtain phase place calibration supplemental characteristic and contrast with demarcating reference point, draw deviate between the two, and deviate is regulated and controled to feedback signal value as frequency stabilization; The 8th step, described data processing module calculates filter regulation and control parameter regulation and control amount according to deviate.
Described data processing module, before intercepting interference light signal data, also carries out the judgement whether data with existing section is chosen mode; If had, described data processing module directly utilizes the data sequence of being scheduled to store to choose mode and chooses data sequence.
Described data processing module obtains after phase place calibration parameter, also carries out whether this phase place being calibrated to parameter value as the judgement of standard value; If so, data segment corresponding to this standard value chosen to form and store in system, as follow-up nominal data sequence, choose mode, this standard value is stored in system simultaneously, as the demarcation reference point of subsequent detection.
When frequency stabilization system adopts driving voltage or electric current regulation and control, what described data processing module calculated is filter driving voltage or electric current regulation and control parameter; When frequency stabilization system adopts temperature adjusting, what described data processing module calculated is that filter working temperature is adjusted parameter.
Realize a frequency stabilization system for interferometric phase parameter calibration feedback regulation frequency-stabilizing method described above, include successively connected coupler module, intervention module, detector module, data acquisition module, data processing module, filter parameter regulation and control Executive Module; Wherein, the output of sweeping laser system is located at and is connected to described coupler module, is mainly used in a part of frequency sweep Output of laser to separate, and introduces in described intervention module; Described intervention module adopts typical optical fiber formula mark-Zehnder interferometer structure, mainly by the first fiber coupler, the second fiber coupler, formed, and between described the first fiber coupler and the second fiber coupler, the first optical fiber with two sections of different lengths is connected with the second optical fiber conducting; Described detector module is connected with the output conducting of described the second fiber coupler interference light, is mainly used in converting the signal of telecommunication to from the interference light signal of described intervention module output, and is transported to described data acquisition module; Described data acquisition module is mainly used in the interference light signal of telecommunication from described detector module, frequency sweep cycle signal with filter driver from described sweeping laser system, be converted in the lump data storages, and these data are offered to described data processing module carry out data processing; Described data processing module is mainly used in the data from described data acquisition module to process, calculate, obtain interferometric phase parameter, and compare with demarcating reference point, calculate filter regulation and control parameter regulation and control amount, finally export to described filter parameter regulation and control Executive Module; Described filter parameter regulation and control Executive Module is connected with the conducting of described sweeping laser system, is mainly used according to the filter regulation and control parameter regulation and control amount from described data processing module, the running parameter of described sweeping laser system median filter being regulated and controled.
Described coupler module is fiber coupler; Described detector module is photodetector; Described data acquisition module is data collecting card; Described data processing module is circuit or the chip with data-handling capacity, or computer and corresponding data handling procedure; Described filter parameter regulation and control Executive Module is driving voltage adjustment module, drive current adjustment module or filter temperature adjusting mechanism module.
Described the second fiber coupler is 2 * 2 fiber couplers, and described detector module is difference photodetector, or described the second fiber coupler is 2 * 1 fiber couplers, and described detector module is normal optical electric explorer.
Described filter parameter regulation and control Executive Module is liquid-cooled thermoregulation mechanism, include the thermoregulator Temperature of Working adjustment module of liquid-cooled and liquid cooling Working fluid flow passage that mutual conduction connects, and the thermoregulator Temperature of Working adjustment module of described liquid-cooled is connected with described data processing module conducting, described liquid cooling Working fluid flow passage is located at around the piezoelectric actuator of described filter.
The technique scheme of passing through of the present invention, can utilize intervention module to coordinate with data processing module, changing value that can Quick Measurement sweeping laser interferometric phase parameter, realized the Real-Time Monitoring to sweeping laser tuned frequency drift phenomenon, and by data processing module, calculate filter regulation and control parameter regulation and control amount the filter of sweeping laser system is regulated and controled, realize the quick response to the drift of sweeping laser tuned frequency, realized frequency stabilization output; And frequency stabilization system of the present invention can be integrated in swept light source system easily, greatly promote the frequency sweep stability of light-source system.
Accompanying drawing explanation
Fig. 1 is the sweeping laser tuned frequency drift schematic diagram of sweeping laser system.
Fig. 2 is the structural representation of interferometric phase parameter calibration feedback regulation frequency stabilization system embodiment mono-of the present invention.
Fig. 3 is the structural representation of interferometric phase parameter calibration feedback regulation frequency stabilization system embodiment bis-of the present invention.
Fig. 4 is the schematic flow sheet of the frequency-stabilizing method of interferometric phase parameter calibration feedback regulation frequency stabilization system of the present invention.
Fig. 5 is the schematic flow sheet that in interferometric phase parameter calibration feedback regulation frequency-stabilizing method of the present invention, data processing obtains interferometric phase parameter.
Embodiment
Below in conjunction with accompanying drawing, technical solution of the present invention is elaborated.
Refer to Figure of description Fig. 1-5.Coupler module 1, intervention module 2(the first fiber coupler 21, the second fiber coupler 22, the first optical fiber 23 and the second optical fiber 24 in figure), detector module 3, data acquisition module 4, data processing module 5, filter parameter regulation and control Executive Module 6 and sweeping laser system 7(amplifier 71, coupler 72, filter 73).
As shown in Figure 1, Figure 2:
Interferometric phase parameter calibration feedback regulation frequency stabilization system of the present invention includes successively connected coupler module 1, intervention module 2, detector module 3, data acquisition module 4, data processing module 5, filter parameter regulation and control Executive Module 6.Wherein, coupler module 1 is fiber coupler, is located at and is connected to the output of sweeping laser system 7, is mainly used in a part of frequency sweep Output of laser to separate, and introduces in intervention module 2.Intervention module 2 adopts typical optical fiber formula mark-Zehnder interferometer (MZI) structure, mainly by the first fiber coupler 21, the second fiber coupler 22, formed, the first fiber coupler 21 is 1 * 2 fiber couplers, the second fiber coupler 22 is 2 * 2 fiber couplers, and the energy Ratios of two fiber coupler output light is 50:50, and between the first fiber coupler 21 and the second fiber coupler 22, optical fiber (the first optical fiber 23, the second optical fiber 24) conducting with two sections of different lengths connects.Sweeping laser enters after intervention module 2, first at the first fiber coupler 21, punishes into two-way light; This two-way light through the first optical fiber 23 and second optical fiber 24 of two sections of fixed light path differences, interferes and is coupled at the second fiber coupler 22 places, and being delivered to detector module 3 respectively.Detector module 3 is difference photodetectors, its electrode input end is connected with the output conducting of the second fiber coupler 22 two-way interference lights respectively with negative input, form difference input mode and suppress common-mode noise, detector module 3 is mainly used in converting the signal of telecommunication to from the interference light signal of intervention module 2 outputs, and is transported to data acquisition module 4.Data acquisition module 4 is data collecting cards, be mainly used in the interference light signal of telecommunication from detector module 3, start time signal with the frequency sweep cycle of filter driver from sweeping laser system, be converted in the lump data storages, and these data are offered to data processing module 5 carry out data processing.Data processing module 5 is that (this built-in chip type has data processor to the chip with data-handling capacity, as GPU, MCU, DSP, FPGA), be mainly used in processing, calculating from the data of data acquisition module 4, obtain interferometric phase parameter value, and compare with demarcation reference point, according to deviate between the two, calculate filter regulation and control parameter regulation and control amount (this filter regulation and control parameter regulation and control amount is driving voltage or electric current regulation and control parameter), finally export to filter parameter regulation and control Executive Module 6.Filter parameter regulation and control Executive Module 6 is that (this driving voltage adjustment module or drive current adjustment module are conventional driving voltage or drive current adjustment device for the driving voltage adjustment module that is connected with 7 conductings of sweeping laser system or drive current adjustment module, at this, be no longer described in detail), be mainly used according to the filter regulation and control parameter regulation and control amount from data processing module 5, the task driven voltage of sweeping laser system 7 median filters or task driven electric current being regulated and controled, realize sweeping laser system frequency stabilization output.
Certainly, described the second fiber coupler (22) also can 2 * 1 fiber couplers, and accordingly, described detector module (3) is normal optical electric explorer.The energy Ratios of described two fiber coupler output light can be also other any ratios.
During interferometric phase parameter calibration feedback regulation frequency stabilization system work of the present invention, its frequency-stabilizing method comprises the following steps: first, coupler module 1 is divided into two-way by the laser of sweeping laser system 7 outputs, and wherein a road laser continues output, and another road laser enters intervention module 2; Then, 2 pairs of laser that enter of described intervention module are interfered and are coupled, be specially: the first fiber coupler 21 of intervention module 2 is divided into two-way light by the laser entering again, and two optical fiber (the first optical fiber 23 and the second optical fiber 24) that pass through respectively different optical path lengths are sent to the second fiber coupler 22, at the second fiber coupler 22, join and interfere, be coupled; Then, detector module 3 is converted into the signal of telecommunication by interference light signal, and outputs to data acquisition module 4; Again then, data acquisition module 4 is converted into data by the interference light signal of telecommunication gathering and store, and outputs to data processing module 5; Follow again, data processing module 5 is processed according to carrying out interference light electrical signal data, obtain interferometric phase parameter and calibrate parameter value as phase place, and compare with demarcation reference point, obtain deviate between the two, and deviate is regulated and controled to feedback signal value as frequency stabilization, and calculate filter regulation and control parameter regulation and control amount according to deviate; Finally, filter parameter regulation and control Executive Module 6 regulates and controls the work parameter of filter according to filter regulation and control parameter regulation and control amount, realizes the 7 frequency stabilization outputs of sweeping laser system.
Like this, the present invention can utilize intervention module 2 to coordinate the changing value of the sweeping laser interferometric phase parameter of measuring rapidly sweeping laser system 7 with data processing module 5, realized the Real-Time Monitoring to sweeping laser tuned frequency drift phenomenon, and with data processing module 5 calculating filter regulation and control parameter regulation and control amounts, by filter parameter, regulating and controlling Executive Module 6 regulates and controls, realize the quick response to the drift of sweeping laser tuned frequency, realized frequency stabilization output; And frequency stabilization system of the present invention can be integrated in swept light source system easily, greatly promote the frequency sweep stability of light-source system.
In addition, described sweeping laser system 7 includes amplifier 71, coupler 72 and the filter 73 that is connected successively and forms loop checking installation, coupler 72 is fiber couplers, filter 73 is piezoelectric type filters, and fiber coupler 72 is connected with 1 conducting of coupler module, piezoelectric type filter 63 is connected with 6 conductings of filter parameter regulation and control Executive Module.The swept light source of described sweeping laser system 7 is in service, the piezoelectric actuator temporal evolution of filter 73 provides corresponding driving voltage, system control program outputs to data processing module 5 by the time cycle signal of filter 73 frequency sweeps simultaneously, filter 73 carries out frequency selection under the driving of driving voltage, realize frequency-swept, its sweeping laser tuned frequency drift as shown in Figure 1, abscissa is the driving voltage value of filter, when variations in temperature, piezoelectricity-the frequency response curve of filter changes, therefore, when temperature is different, under identical driving voltage, can obtain different output frequencies, occur as frequency drift.
As shown in Figure 3:
Interferometric phase parameter calibration feedback regulation frequency stabilization system embodiment bis-of the present invention is basic identical with the structure of embodiment mono-, include equally successively connected coupler module 1, intervention module 2, detector module 3, data acquisition module 4, data processing module 5, filter parameter regulation and control Executive Module 6, difference is only: the filter regulation and control Executive Module 6 of embodiment bis-is filter temperature adjusting mechanism modules, liquid-cooled thermoregulation mechanism for example, include the thermoregulator Temperature of Working adjustment module of liquid-cooled and liquid cooling Working fluid flow passage that mutual conduction connects, and the thermoregulator Temperature of Working adjustment module of liquid-cooled is connected with data processing module 5 conductings, liquid cooling Working fluid flow passage is located at around the piezoelectric actuator of filter 73.Now, the described filter regulation and control parameter regulation and control amount that described data processing module 5 calculates is filter 73 working temperature regulation and control parameters.
As shown in Figure 4:
The frequency-stabilizing method of interferometric phase parameter calibration feedback regulation frequency stabilization system of the present invention comprises the following steps:
A1: the swept light source of sweeping laser system 7 is in service, the piezoelectric actuator temporal evolution of filter provides corresponding driving voltage;
A2: sweeping laser system 7 control programs output to data acquisition module 4 by the time cycle signal time starting point signal of filter frequency sweep simultaneously;
A3: filter carries out frequency selection under driving voltage drives, and realizes frequency-swept;
A4: laser sweeping laser output, the laser that is the 7 light source outputs of sweeping laser system is divided into through fiber coupler 1 the two-way laser that energy Ratios is 95:5, wherein, energy is that 95% mono-road laser continues output as light source Output of laser, and another road laser that energy is 5% enters intervention module 2;
A5: 2 pairs of intervention module enter sharp interference of light, first the laser that enters intervention module 2 be divided into through the first fiber coupler 21 the two-way light that energy Ratios is 50:50 again, and this two-way light is joined and interferes at second fiber coupler 22 places through the optical fiber (the first optical fiber 23 and the second optical fiber 24) of two different lengths respectively;
A6: it is the signal of telecommunication that detector module 3 transforms interference light, from the interference light of the second fiber coupler 22 outputs, be divided into the two-way light that energy is equal, and be input to respectively electrode input end and the negative input of a difference photodetector, form difference input mode and suppress common-mode noise, interference light signal is converted into the signal of telecommunication by difference photodetector simultaneously, outputs to data acquisition module 4;
A7: data acquisition module 4 in the future autodyne gathers and stores after dividing the interference light signal of telecommunication of photodetector 3 and being converted into digitalized data from the frequency sweep cycle signal (being start time signal) of the filter driver of sweeping laser system 7, and these data are outputed to data processing module 5;
A8: data processing module 5 calculates interferometric phase parameter, be that data processing module 5 on computer carries out computing, processing by corresponding software program to the time cycle signal time starting point signal data of interference light electrical signal data and filter frequency sweep, show that interferometric phase parameter calibrates parameter value as phase place;
A9: the deviate that judges phase place calibration parameter value and demarcate reference point is in allowed band? "Yes" performs step A12, and "No" performs step A10 and A11;
A10: data processing module 5, according to phase place calibration parameter value and the deviate of demarcating reference point, calculates corresponding filter parameter regulation and control amount, and output to regulation and control Executive Module 6;
A11: regulation and control Executive Module 6 carries out frequency stabilization regulation and control according to regulation and control parameter regulation and control amount, be that computer must filter regulation and control parameter regulation and control amount output to corresponding regulation and control Executive Module by data processing module 5, filter 73 to sweeping laser system 7 regulates and controls, and realizes sweeping laser system 7 frequency stabilization output sweeping lasers;
A12: keep when pre-filter running parameter.
As shown in Figure 5:
In the frequency-stabilizing method of interferometric phase parameter calibration feedback regulation frequency stabilization system of the present invention, the processing procedure of the data processing module 5 of steps A 8 comprises the following steps:
A801: judge whether that data with existing section chooses mode, judge whether system has chosen preparation as the data sequence of interferometric phase data processing? "Yes" performs step A802, and "No" performs step A803;
A802: data processing module 5 directly utilizes the data sequence of being scheduled to store to choose mode (data segment is chosen mode) and choose data sequence in interference light signal data;
A803: the interference light signal data that intercept the continuous time series of any segment length in the data segment of data processing module 5 in a frequency sweep cycle;
A804: each data in the data segment of intercepting are made to Hilbert (Hilbert) conversion process;
A805: extract corresponding real part data and imaginary data according to the Hilbert transform expression-form of each data point;
A806: real part data and the imaginary data corresponding according to each Hilbert transform value, calculate corresponding phase place, obtain thus the phase data sequence corresponding to interference light signal data sequence;
A807: utilize phase unwrapping algorithm to carry out phase unwrapping processing to phase data sequence;
A808: phase unwrapping is processed and obtained a total phase place, the phase place calibration parameter using this total phase parameter as data processing method of the present invention;
A809: judge whether using this phase place calibration parameter value as standard value? whether the Laser output that namely judges sweeping laser system 7 normal? "Yes" performs step A810 and A811, and "No" performs step A812;
A810: data segment corresponding to this standard value chosen to form and store in system, choose mode as follow-up nominal data sequence;
A811: this standard value is stored in system, as the demarcation reference point of subsequent detection;
A812: in the situation that sweeping laser system is carried out frequency stabilization regulation and control, the interferometric phase parameter obtaining is calibrated to parameter value as phase place, and compare with demarcating reference point, obtain deviate between the two, and deviate is regulated and controled to feedback signal value as frequency stabilization;
A813: obtain frequency stabilization regulation and control parameter (being that filter regulates and controls parameter regulation and control amounts) the data of data processing module 5 deviate in being stored in data processing module 5 and corresponding relation experience curve (this experience curve for by experiment obtain experimental deviate and regulation and control amount experience curve) of regulation and control parameter according to deviate.When frequency stabilization system adopts driving voltage or electric current regulation and control, what data processing module 5 calculated is filter driving voltage or electric current regulation and control parameter; When frequency stabilization system adopts temperature adjusting, what data processing module 5 calculated is that filter working temperature is adjusted parameter.
Above content is in conjunction with concrete optimal technical scheme further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. an interferometric phase parameter calibration feedback regulation frequency-stabilizing method, is characterized in that, described frequency-stabilizing method comprises the following steps:
A. coupler module (1) is divided into two-way by the laser of sweeping laser system (7) output, and wherein a road laser continues output, and another road laser enters intervention module (2); During described sweeping laser system (7) operation, the start time signal of the time cycle of filter frequency sweep is outputed to data acquisition module (4) simultaneously, and be converted in the lump data with interference light signal, output to data processing module (5);
B. described intervention module (2) is carried out spectral interference coupling to the laser entering;
C. detector module (3) is converted into the signal of telecommunication by interference light signal, and outputs to data acquisition module (4);
D. described data acquisition module (4) is converted into data by the interference light signal of telecommunication gathering and store, and outputs to data processing module (5);
E. described data processing module (5) is processed according to the electrical signal data of interference light:
E1. in the data segment of described data processing module (5) in a frequency sweep cycle, intercept the interference light signal data of the continuous time series of any segment length; Described data processing module (5), before intercepting interference light signal data, also carries out the judgement whether data with existing section is chosen mode; If had, described data processing module (5) directly utilizes the data sequence of being scheduled to store to choose mode and chooses data sequence;
E2. each data in the data segment of intercepting being done to Hilbert transform processes;
E3. according to the Hilbert transform expression-form of each data point, extract corresponding real part data and imaginary data;
E4. real part data and the imaginary data corresponding according to each Hilbert transform value, calculates corresponding phase place, obtains thus the phase data sequence corresponding to interference light signal data sequence;
E5. utilize phase unwrapping algorithm to carry out phase unwrapping processing to phase data sequence;
E6. phase unwrapping is processed and is obtained a total phase place, the phase place calibration parameter using this total phase parameter as data processing method; Described data processing module (5) obtains after phase place calibration parameter, also carries out whether this phase place being calibrated to parameter value as the judgement of standard value; If so, data segment corresponding to this standard value chosen to form and store in system, as follow-up nominal data sequence, choose mode, this standard value is stored in system simultaneously, as the demarcation reference point of subsequent detection;
E7. in the situation that sweeping laser system is carried out frequency stabilization regulation and control, the phase place calibration supplemental characteristic obtaining is contrasted with demarcating reference point, draw deviate between the two, and carry out the whether judgement in allowed band of both deviates;
If e8. digital baseband input signal is in the allowed band of setting, keep when pre-filter running parameter; If judgment bias value exceeds allowed band, described data processing module (5) calculates filter regulation and control parameter regulation and control amount according to digital baseband input signal;
F. filter parameter regulation and control Executive Modules (6) regulate and control the running parameter of filter according to described filter regulation and control parameter regulation and control amount, realize described sweeping laser system (7) frequency stabilization output.
2. interferometric phase parameter calibration feedback regulation frequency-stabilizing method according to claim 1, it is characterized in that: when frequency stabilization system adopts driving voltage or electric current regulation and control, what described data processing module (5) calculated is filter driving voltage or electric current regulation and control parameter; When frequency stabilization system adopts temperature adjusting, what described data processing module (5) calculated is filter working temperature regulation and control parameters.
3. a frequency stabilization system that realizes in claim 1 or 2 the interferometric phase parameter calibration feedback regulation frequency-stabilizing method described in any one, is characterized in that: include successively connected coupler module (1), intervention module (2), detector module (3), data acquisition module (4), data processing module (5), filter parameter regulation and control Executive Module (6); Wherein,
Described coupler module (1) is fiber coupler, is located at and is connected to the output of sweeping laser system (7), is mainly used in a part of frequency sweep Output of laser to separate, and introduces in described intervention module (2);
Described intervention module (2) comprises the first fiber coupler (21) and the second fiber coupler (22), and between described the first fiber coupler (21) and the second fiber coupler (22), with first optical fiber (23) of two sections of different lengths, conducting is connected with the second optical fiber (24);
Described detector module (3) is photodetector, be connected with the output conducting of described the second fiber coupler (22) interference light, for converting the signal of telecommunication to from the interference light signal of described intervention module (2) output, and be transported to described data acquisition module (4);
Described data acquisition module (4) is for an interference light signal of telecommunication from described detector module (3), start time signal with the frequency sweep cycle of filter driver from described sweeping laser system (7), be converted in the lump data storages, and these data are offered to described data processing module (5) carry out data processing;
Described data processing module (5) is the chip with data-handling capacity, or computer and corresponding data handling procedure, for calibrating parameter value using processing, obtain interferometric phase parameter from the data of described data acquisition module (4) as phase place, and compare with demarcation reference point, obtain deviate between the two, and when this deviate exceeds allowed band, further calculate filter regulation and control parameter regulation and control amount, finally export to described filter parameter regulation and control Executive Module (6);
Described filter parameter regulation and control Executive Modules (6) are driving voltage adjustment module or drive current adjustment module or filter temperature adjusting mechanism module, be connected with described sweeping laser system (7) conducting, for the running parameter of described sweeping laser system (7) median filter being regulated and controled according to the filter regulation and control parameter regulation and control amount from described data processing module (5).
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| CA2880038C (en) * | 2012-07-27 | 2021-06-01 | Thorlabs, Inc. | Agile imaging system |
| WO2014194507A1 (en) * | 2013-06-06 | 2014-12-11 | 华为技术有限公司 | Optical frequency monitoring device |
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