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CN114050466A - Comb wave generation system for electromagnetic compatibility radiation disturbance - Google Patents

Comb wave generation system for electromagnetic compatibility radiation disturbance Download PDF

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CN114050466A
CN114050466A CN202111130719.3A CN202111130719A CN114050466A CN 114050466 A CN114050466 A CN 114050466A CN 202111130719 A CN202111130719 A CN 202111130719A CN 114050466 A CN114050466 A CN 114050466A
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module
laser
comb
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CN114050466B (en
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陈庆雄
张卫华
刘寒遥
李文丽
宋扬
蒋笑林
黄贺
胡浩
彭峥
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Hunan Institute of Metrology and Test
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
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Abstract

The invention provides an electromagnetic compatibility radiation disturbance comb wave generation system, which comprises a multiple quantum well distributed feedback laser module and an odd harmonic suppression module of a GS (generalized sampling) mode, and a DFB (distributed feedback) laser transmitter, wherein the multiple quantum well distributed feedback laser module and the odd harmonic suppression module are electrically connected with a main control module, and the DFB laser transmitter is electrically connected with the main control module; the odd harmonic suppression module comprises a second laser driving current emission module with a 19GHz coherent optical frequency, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module. The system provided by the invention can generate 10MHz fundamental wave and harmonic signal, and form stable comb signal in space after amplifying and shaping the signal.

Description

Comb wave generation system for electromagnetic compatibility radiation disturbance
Technical Field
The invention belongs to the technical field of laser wave emission systems, and particularly relates to a comb wave generation system for electromagnetic compatibility radiation disturbance.
Background
The intellectualization, miniaturization and integration of products such as household appliances, automobiles, consumer electronics and the like are inevitable developments, the electromagnetic interference of the products due to the trend development is required to be stricter and stricter, at present, no matter in the procurement plan of the government or the product research and development of civil enterprises, a report of qualification above provincial level of a third party is definitely required, and the electromagnetic interference is taken as an important index and listed as a necessary inspection item.
In the system used for the electromagnetic interference detection project, important equipment comprises a darkroom, a test antenna, a cable, a receiver and the like, and in all qualified laboratories with provincial levels, radiation test points, instruments and accessories are calibrated at least once every year. How to ensure the accuracy and reliability of data in a laboratory and quickly and effectively find the problem of data deviation needs a stable signal transmitting comb-shaped laser wave to control.
Disclosure of Invention
In view of the above-mentioned drawbacks, the present invention provides a comb wave generation system for electromagnetic compatibility disturbance radiation, which can prevent electromagnetic radiation interference from the external environment and further provide comb laser waves capable of stably transmitting signals.
The invention provides the following technical scheme: a comb wave generation system for electromagnetic compatibility radiation disturbance comprises a multiple quantum well distributed feedback laser module of a GS mode, an odd harmonic suppression module main control module and a DFB laser transmitter, wherein the multiple quantum well distributed feedback laser module and the odd harmonic suppression module of the GS mode are electrically connected with the main control module, the main control module is electrically connected with the DFB laser transmitter, and the multiple quantum well distributed feedback laser module of the GS mode comprises a first laser driving current transmitting module, a first radio frequency amplification module and a direct current bias module, wherein the variable self-contained spectral range of the first laser driving current transmitting module is 9.5GHz coherent optical frequency; the odd harmonic suppression module comprises a second laser driving current emission module, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module, wherein the second laser driving current emission module can change the coherent optical frequency of 19GHz in the spectral range;
the phase shift circuit module with the angle of 0-180 degrees respectively transmits the laser driving signal amplified by the second radio frequency amplification module to one arm and the other arm of the dual-drive Mach-Zehnder modulator module, and the laser driving signal I output by the dual-drive Mach-Zehnder modulator module2(t) and laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1(t) are combined into a total laser driving current signal I (t) which is transmitted to the main control module, and the total laser driving current signal I (t) is subjected to iterative optimization and then is transmitted to have a complex electric field EGS(t) an optical frequency comb.
Further, the multiple quantum well distributed feedback laser module of the GS mode constructs a gain switch laser model and modulates a laser driving current signal I at the time t1(t) the master control module employs a complex electric field E with influenceGS(t) index characteristics of flatness of optical frequency comb: amplitude c of constant bias current0N, amplitude chAnd the relative phase between the first N-1 harmonic and the Nth harmonich，NConstructing a final output comb laser wave candidate solution x model with optimal flatness, wherein h is 1,2, …, N-1, and iteratively minimizing the fitness function model f (x) of the candidate solution x to finally obtain an optimal variation solution g 'with optimal comb laser wave flatness after iterative optimization and fitness evaluation'bast。
Further, a gain switch laser model constructed by the multiple quantum well distributed feedback laser module of the GS mode is as follows:
Figure BDA0003280388500000021
Figure BDA0003280388500000022
Figure BDA0003280388500000023
Figure BDA0003280388500000024
wherein n isinjIs the injection efficiency, VtotThe total volume of the active region and the separate confinement heterostructure of a multiple quantum well distributed feedback laser module being a GS mode, VwIs the volume of the well, τwIs the lifetime of the carriers in the well, τbFor the lifetime of the carriers in the barrier region, τbwIs the capture time, τwbIs the escape time, omega is the differential gain, taupFor photon lifetime, epsilon is the nonlinear gain suppression coefficient, Γ is the optical confinement factor, n0Is the carrier transparency density, nwCarrier density of well bound state, nbIs the carrier density of the bound state of the barrier region, nthIs the threshold carrier density in the well region, RspFor spontaneous emissivity, α is the linewidth enhancement factor, q is the electron charge, S is the photon density, vgθ is the optical phase for group velocity.
Further, the laser driving signal I output by the multiple quantum well distributed feedback laser module of the GS mode1The calculation formula of (t) is as follows: i is1(t)＝IDC1(t)+ΔI1sin (2 π × 9.5 t); wherein, IDC1(t) is the constant bias current in the multiple quantum well distributed feedback laser module of the GS mode,ΔI1distributing a large amplitude in a feedback laser module for the multiple quantum wells of the GS mode;
laser driving signal I output by the dual-drive Mach-Zehnder modulator module2The calculation formula of (t) is as follows: i is2(t)＝IDC2(t)+ΔI2sin (2 π × 19 t); wherein, IDC2(t) is a constant bias current in the dual drive Mach-Zehnder modulator module, Delta I1Is a large amplitude in the dual drive mach-zehnder modulator module;
Figure BDA0003280388500000031
wherein N represents the number of harmonics, c0Is the amplitude of the constant bias current, chAnd phihAmplitude and phase, f, of harmonics, respectively, of the laser drive current signal0The frequency of the laser drive current signal generated for a constant bias current;
emitting a total laser driving current signal I (t) after iterative optimization and having a complex electric field EGS(t) in the optical frequency comb of EGSThe calculation formula of (t) is as follows:
Figure BDA0003280388500000032
wherein S (t) is the photon density at time t, VπIs the maximum transmission point v of the dual-drive Mach-Zehnder modulator module under the working frequency1(t) is the voltage across one arm of the dual drive Mach-Zehnder modulator module, v2(t) is the voltage on one arm of the dual drive Mach-Zehnder modulator module
Further, the candidate solution x model of the comb laser wave is as follows:
x＝[c0 c1 c2…cN Δφ1,N Δφ2,N…ΔφN-1,N]。
further, the calculation formula of the fitness function model f (x) is as follows:
Figure BDA0003280388500000041
wherein the peak power value P of l continuous carrierslThe set P is formed, L is 1,2, …, L, μ is the average value of the set P,
Figure BDA0003280388500000042
further, the main control module iteratively optimizes the flatness of the comb laser wave to finally obtain the optimal variation solution g 'with the best flatness of the comb laser wave after iterative optimization and fitness evaluation'bastThe method comprises the following steps:
s1: initially, when the number of iterations k is 0, N is usedcGenerating an ensemble of candidate solutions x
Figure BDA0003280388500000045
Figure BDA0003280388500000046
Initializing laser position x0,iAnd laser speed v0,iI represents the whole Xk＝0The ith candidate solution as a particle;
s2: construction of equation f (x)0,i) Find the best initial solution gbest；
When k is less than the total algebra N of the optimal variant solutioniteWhen for i ═ 1 to NcParticles, at k ≧ 0 iterations, mutation by population x at presentk，iIn-hybrid random solution to create donor vector vk，iThen generating a binomial cross vector u by crossingk，iSaid donor vector vk,iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000043
wherein r is1、r2And r3Is a randomly generated overall index of the image,all belong to {1, 2., Nc }, and F is [0,1 ]]A scale factor within the range;
the binomial cross vector uk,iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000044
wherein u isk,i,dA binomial cross vector u determined for the drive current parameter dk,i，vk,i,dDonor vector v determined for drive current parameter dk,i，xk,i,dCandidate solutions determined for the drive current parameter d; r iscIs a random number between 0 and 1 generated during the optimization of each driving current parameter d;
s3: verifying the spectral response of the finally emitted comb-shaped laser wave by adopting a fitness function model f (x) of the candidate solution x if f (u)k,i) The flatness of the comb laser wave provided is superior to the current solution f (x)k,i) I.e. f (u)k，i)<f(xk,i) Adopting a binomial cross vector u)k,iUpdating the candidate solution of the k +1 generation, otherwise adopting the candidate solution xk，iAnd updating the candidate solution of the k +1 th generation of the candidate solution:
Figure BDA0003280388500000051
s4: when for all the totality X with Nc particlesk＝0After the optimization candidate solution of each particle in (1) is finished, updating the step S3 according to the following rule and adopting a binomial cross vector uk，iAnd updating to obtain an optimal candidate solution: if f (u)k，i)<f(gbest) Updating the optimal initial solution g constructed in the step S2bestIs g'bastAnd g 'are'bastAnd defining the optimal variation solution with the best flatness of the comb laser wave.
Furthermore, the working frequency of the dual-drive Mach-Zehnder modulator module in the odd harmonic suppression module is 30GHz, and the maximum transmission point V isπThe voltage of the water-soluble organic silicon is 2.5V,biased at the point of maximum transmission to suppress odd harmonics and produce only even harmonics.
Further, the first rf amplifying module performs gain switching on the laser driving current emitted by the laser driving current emitting module by using an amplified rf signal with a power of about 18 dBm.
The invention has the beneficial effects that:
1. the comb wave generating system for electromagnetic compatibility radiation disturbance provided by the invention adopts the aggregation of laser driving current signals of a multiple quantum well distributed feedback laser module of a GS mode and an odd harmonic suppression module, then carries out iterative optimization selection on the signals through a main control module, can generate 10MHz fundamental wave and harmonic signals, and forms stable comb signals in space through antenna emission after amplifying and shaping the signals.
2. The comb wave generating system for electromagnetic compatibility radiation disturbance provided by the invention is an autonomous research and development circuit, can form comb signals which are between 10MHz and 3GHz and take 5MHz, 10MHz and 50MHz as steps, effectively improves the frequency stability and the signal intensity stability of the final comb laser wave, can emit stable values in different electromagnetic interference environments, and can also realize the repeatability of an electromagnetic interference measuring system.
3. The comb wave generating system for electromagnetic compatibility radiation disturbance provided by the invention is applied to a comb wave generator, can generate several stepping type frequency stability generating signals, can repeatedly measure the frequency and voltage stability assignment of the signals under the same environment, and can be used for period check of a laboratory and comparison among laboratories.
4. The comb wave generating system for electromagnetic compatibility radiation disturbance provided by the invention can prevent electromagnetic interference in the environment when being applied to laboratory detection, so as to provide stable comb laser waves, effectively improve the measurement consistency, accuracy and repeatability of a radiation disturbance testing system, and improve the data controllability of a laboratory; the data evaluation capability among laboratories is effectively improved, and laboratory data mutual recognition can be performed in the comparison process; the method fills the blank of research and development technology and scheme of the signal generator in the aspect of EMC detection, assists the accuracy of measured data among laboratories, and has practical economic and social benefits for the development of the electronic industry.
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The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic diagram of the overall structure of the electromagnetic compatibility radiation disturbance comb wave generation system provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the comb wave generation system for electromagnetic compatibility radiation disturbance provided by the present invention includes a multiple quantum well distributed feedback laser module of a GS mode, a main control module of an odd harmonic suppression module, and a DFB laser transmitter, wherein the multiple quantum well distributed feedback laser module of the GS mode and the odd harmonic suppression module are both electrically connected to the main control module, the main control module is electrically connected to the DFB laser transmitter, and the multiple quantum well distributed feedback laser module of the GS mode includes a first laser driving current emission module, a first radio frequency amplification module, and a dc offset module, which have a variable spectral range of 9.5GHz coherent optical frequency; the odd harmonic suppression module comprises a second laser driving current emission module, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module, wherein the second laser driving current emission module can change the coherent optical frequency of 19GHz in the spectral range;
the phase-shift circuit module with the angle of 0-180 degrees respectively transmits the laser driving signals amplified by the second radio frequency amplification module to one arm and the other arm of the dual-drive Mach-Zehnder modulator module, and the laser driving signals are output by the dual-drive Mach-Zehnder modulator moduleOutput laser driving signal I2(t) and laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1(t) are combined into a total laser driving current signal I (t) and transmitted to a main control module, and the total laser driving current signal I (t) is subjected to iterative optimization and then is transmitted to a complex electric field EGS(t) an optical frequency comb.
The multiple quantum well distributed feedback laser module of the GS mode constructs a gain switch laser model and modulates a laser driving current signal I at the time t1(t) the main control module employs a complex electric field E with influenceGS(t) index characteristics of flatness of optical frequency comb: amplitude c of constant bias current0N, amplitude chAnd the relative phase between the first N-1 harmonic and the Nth harmonich，NConstructing a final output comb laser wave candidate solution x model with optimal flatness, wherein h is 1,2, …, N-1, and finally obtaining an optimal variant solution g 'with optimal comb laser wave flatness after iterative optimization and fitness evaluation through iteratively minimizing a fitness function model f (x) of the candidate solution x'bast。
Example 2
As shown in fig. 1, the comb wave generation system for electromagnetic compatibility radiation disturbance provided in this embodiment includes a multiple quantum well distributed feedback laser module of a GS mode, a main control module of an odd harmonic suppression module, and a DFB laser transmitter, where the multiple quantum well distributed feedback laser module of the GS mode and the odd harmonic suppression module are both electrically connected to the main control module, the main control module is electrically connected to the DFB laser transmitter, and the multiple quantum well distributed feedback laser module of the GS mode includes a first laser driving current emission module, a first radio frequency amplification module, and a dc offset module, where the first laser driving current emission module, the first radio frequency amplification module, and the dc offset module may have a spectrum range of 9.5GHz coherent optical frequency; the odd harmonic suppression module comprises a second laser driving current emission module, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module, wherein the second laser driving current emission module can change the coherent optical frequency of 19GHz in the spectral range;
the 0-180 degree phase shift circuit module respectively amplifies the laser driving signals amplified by the second radio frequency amplification moduleA laser driving signal I transmitted to one arm and the other arm of the dual-drive Mach-Zehnder modulator module and output by the dual-drive Mach-Zehnder modulator module2(t) and laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1(t) are combined into a total laser driving current signal I (t) and transmitted to a main control module, and the total laser driving current signal I (t) is subjected to iterative optimization and then is transmitted to a complex electric field EGS(t) an optical frequency comb.
The multiple quantum well distributed feedback laser module of the GS mode constructs a gain switch laser model and modulates a laser driving current signal I at the time t1(t) the main control module employs a complex electric field E with influenceGS(t) index characteristics of flatness of optical frequency comb: amplitude c of constant bias current0N, amplitude chAnd the relative phase between the first N-1 harmonic and the Nth harmonich，NConstructing a final output comb laser wave candidate solution x model with optimal flatness, wherein h is 1,2, …, N-1, and finally obtaining an optimal variant solution g 'with optimal comb laser wave flatness after iterative optimization and fitness evaluation through iteratively minimizing a fitness function model f (x) of the candidate solution x'bast。
The gain switch laser model constructed by the multiple quantum well distributed feedback laser module of the GS mode is as follows:
Figure BDA0003280388500000081
Figure BDA0003280388500000082
Figure BDA0003280388500000083
Figure BDA0003280388500000084
wherein n isinjIs the injection efficiency, VtotThe total volume of the active region and the separate confinement heterostructure of a multiple quantum well distributed feedback laser module being a GS mode, VwIs the volume of the well, τwIs the lifetime of the carriers in the well, τbFor the lifetime of the carriers in the barrier region, τbwIs the capture time, τwbIs the escape time, omega is the differential gain, taupFor photon lifetime, epsilon is the nonlinear gain suppression coefficient, Γ is the optical confinement factor, n0Is the carrier transparency density, nwCarrier density of well bound state, nbIs the carrier density of the bound state of the barrier region, nthIs the threshold carrier density in the well region, RspFor spontaneous emissivity, α is the linewidth enhancement factor, q is the electron charge, S is the photon density, vgθ is the optical phase for group velocity.
Laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1The calculation formula of (t) is as follows: i is1(t)＝IDC1(t)+ΔI1sin (2 π × 9.5 t); wherein, IDC1(t) constant bias current, Δ I, in a multiple quantum well distributed feedback laser module of GS mode1Distributing large amplitude in the feedback laser module for multiple quantum wells of the GS mode;
laser driving signal I output by dual-drive Mach-Zehnder modulator module2The calculation formula of (t) is as follows: i is2(t)＝IDC2(t)+ΔI2sin (2 π × 19 t); wherein, IDC2(t) constant bias current in the dual drive Mach-Zehnder modulator Module, Δ I1Large amplitude in the dual drive mach-zehnder modulator module;
Figure BDA0003280388500000091
wherein N represents the number of harmonics, c0Is the amplitude of the constant bias current, chAnd phihAmplitude and phase, f, of harmonics, respectively, of the laser drive current signal0Laser drive for constant bias current generationThe frequency of the current signal;
emitting a total laser driving current signal I (t) after iterative optimization and having a complex electric field EGS(t) in the optical frequency comb of EGSThe calculation formula of (t) is as follows:
Figure BDA0003280388500000092
wherein S (t) is the photon density at time t, VπIs the maximum transmission point v of the dual-drive Mach-Zehnder modulator module under the working frequency1(t) is the voltage on one arm of the dual drive Mach-Zehnder modulator module, v2(t) is the voltage on one arm of the dual drive Mach-Zehnder modulator module
The comb laser wave candidate solution x model is as follows:
x＝[c0 c1 c2…cN Δφ1，N Δφ2，N…ΔφN-1,N]。
the fitness function model f (x) is calculated as follows:
Figure BDA0003280388500000093
wherein the peak power value P of l continuous carrierslThe set P is formed, L is 1,2, …, L, μ is the average value of the set P,
Figure BDA0003280388500000101
the main control module iteratively optimizes the flatness of the comb laser wave to finally obtain the optimal variation solution g 'with the best flatness of the comb laser wave after iterative optimization and fitness evaluation'bastThe method comprises the following steps:
s1: initially, when the number of iterations k is 0, N is usedcGenerating an ensemble of candidate solutions x
Figure BDA0003280388500000102
Figure BDA0003280388500000103
Initializing laser position x0，iAnd laser speed v0，iI represents the whole Xk＝0The ith candidate solution as a particle;
s2: construction of equation f (x)0，i) Find the best initial solution gbest；
When k is less than the total algebra N of the optimal variant solutioniteWhen for i ═ 1 to NcParticles, at k ≧ 0 iterations, mutation by population x at presentk，iIn-hybrid random solution to create donor vector vk,iThen generating a binomial cross vector u by crossingk，iDonor vector vk，iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000104
wherein r is1、r2And r3Are randomly generated overall indices, all belonging to {1, 2.., Nc }, where F is [0,1 }]A scale factor within the range;
binomial cross vector uk，iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000105
wherein u isk，i，dA binomial cross vector u determined for a drive current parameter d (amplitude or relative phase)k，i，vk,i，dDonor vector v determined for drive current parameter dk，i，xk，i，dCandidate solutions determined for the drive current parameter d; r iscIs a random number between 0 and 1 generated during the optimization of each driving current parameter d;
s3: verifying the spectral response of the finally emitted comb-shaped laser wave by adopting a fitness function model f (x) of the candidate solution x if f (u)k，i) The flatness of the comb-shaped laser wave is better than that of the comb-shaped laser waveFront solution f (x)k，i) I.e. f (u)k，i)<f(xk，i) Adopting a binomial cross vector u)k，iUpdating the candidate solution of the k +1 generation, otherwise adopting the candidate solution xk,iAnd updating the candidate solution of the k +1 th generation of the candidate solution:
Figure BDA0003280388500000111
s4: when for all the totality X with Nc particlesk＝0After the optimization candidate solution of each particle in (1) is finished, updating the step S3 according to the following rule and adopting a binomial cross vector uk,iAnd updating to obtain an optimal candidate solution: if f (u)k,i)<f(gbest) Then, the step S2 is updated to construct the best initial solution gbestIs g'bastAnd g 'are'bastAnd defining the optimal variation solution with the best flatness of the comb laser wave.
The working frequency of the dual-drive Mach-Zehnder modulator module in the odd harmonic suppression module is 30GHz, and the maximum transmission point Vπ2.5V, at the maximum transmission point (V)DC＝Vπ) Biased to suppress odd harmonics and generate only even harmonics.
The first radio frequency amplification module performs gain switching on the laser driving current emitted by the laser driving current emission module by using an amplified radio frequency signal with power of about 18 dBm.
Example 3
The comb wave generation system for electromagnetic compatibility radiation disturbance provided by the embodiment comprises a multiple quantum well distributed feedback laser module of a GS mode, an odd harmonic suppression module main control module and a DFB laser transmitter, wherein the multiple quantum well distributed feedback laser module of the GS mode and the odd harmonic suppression module are electrically connected with the main control module, the main control module is electrically connected with the DFB laser transmitter, and the multiple quantum well distributed feedback laser module of the GS mode comprises a first laser driving current transmitting module, a first radio frequency amplification module and a direct current bias module, wherein the variable self-contained spectrum range of the first laser driving current transmitting module is 9.5GHz coherent light frequency; the odd harmonic suppression module comprises a second laser driving current emission module, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module, wherein the second laser driving current emission module can change the coherent optical frequency of 19GHz in the spectral range;
the phase shift circuit module with the angle of 0-180 degrees respectively transmits the laser driving signal amplified by the second radio frequency amplification module to one arm and the other arm of the dual-drive Mach-Zehnder modulator module, and the laser driving signal I output by the dual-drive Mach-Zehnder modulator module2(t) and laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1(t) are combined into a total laser driving current signal I (t) and transmitted to a main control module, and the total laser driving current signal I (t) is subjected to iterative optimization and then is transmitted to a complex electric field EGS(t) an optical frequency comb.
The multiple quantum well distributed feedback laser module of the GS mode constructs a gain switch laser model and modulates a laser driving current signal I at the time t1(t) the main control module employs a complex electric field E with influenceGS(t) index characteristics of flatness of optical frequency comb: amplitude c of constant bias current0N, amplitude chAnd the relative phase between the first N-1 harmonic and the Nth harmonich，NConstructing a final output comb laser wave candidate solution x model with optimal flatness, wherein h is 1,2, …, N-1, and finally obtaining an optimal variant solution g 'with optimal comb laser wave flatness after iterative optimization and fitness evaluation through iteratively minimizing a fitness function model f (x) of the candidate solution x'bast。
The gain switch laser model constructed by the multiple quantum well distributed feedback laser module of the GS mode is as follows:
Figure BDA0003280388500000121
Figure BDA0003280388500000122
Figure BDA0003280388500000123
Figure BDA0003280388500000124
wherein n isinjIs the injection efficiency, VtotThe total volume of the active region and the separate confinement heterostructure of a multiple quantum well distributed feedback laser module being a GS mode, VwIs the volume of the well, τwIs the lifetime of the carriers in the well, τbFor the lifetime of the carriers in the barrier region, τbwIs the capture time, τwbIs the escape time, omega is the differential gain, taupFor photon lifetime, epsilon is the nonlinear gain suppression coefficient, Γ is the optical confinement factor, n0Is the carrier transparency density, nwCarrier density of well bound state, nbIs the carrier density of the bound state of the barrier region, nthIs the threshold carrier density in the well region, RspFor spontaneous emissivity, α is the linewidth enhancement factor, q is the electron charge, S is the photon density, vgθ is the optical phase for group velocity.
Laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1The calculation formula of (t) is as follows: i is1(t)＝IDC1(t)+ΔI1sin (2 π × 9.5 t); wherein, IDC1(t) constant bias current, Δ I, in a multiple quantum well distributed feedback laser module of GS mode1Distributing large amplitude in the feedback laser module for multiple quantum wells of the GS mode;
laser driving signal I output by dual-drive Mach-Zehnder modulator module2The calculation formula of (t) is as follows: i is2(t)＝IDC2(t)+ΔI2sin (2 π × 19 t); wherein, IDC2(t) constant bias current in the dual drive Mach-Zehnder modulator Module, Δ I1Large amplitude in the dual drive mach-zehnder modulator module;
Figure BDA0003280388500000131
wherein N represents the number of harmonics, c0Is the amplitude of the constant bias current, chAnd phihAmplitude and phase, f, of harmonics, respectively, of the laser drive current signal0The frequency of the laser drive current signal generated for a constant bias current;
emitting a total laser driving current signal I (t) after iterative optimization and having a complex electric field EGS(t) in the optical frequency comb of EGSThe calculation formula of (t) is as follows:
Figure BDA0003280388500000132
wherein S (t) is the photon density at time t, VπIs the maximum transmission point v of the dual-drive Mach-Zehnder modulator module under the working frequency1(t) is the voltage on one arm of the dual drive Mach-Zehnder modulator module, v2(t) is the voltage on one arm of the dual drive mach-zehnder modulator module.
The comb laser wave candidate solution x model is as follows:
x＝[c0 c1 c2…cN Δφ1，N Δφ2，N…ΔφN-1，N]。
the fitness function model f (x) is calculated as follows:
Figure BDA0003280388500000133
wherein the peak power value P of l continuous carrierslThe set P is formed, L is 1,2, …, L, μ is the average value of the set P,
Figure BDA0003280388500000134
the main control module iteratively optimizes the flatness of the comb laser wave to finally obtain the flatness of the comb laser wave after iterative optimization and fitness evaluationOptimal variant solution g'bastThe method comprises the following steps:
s1: initially, when the number of iterations k is 0, N is usedcGenerating an ensemble of candidate solutions x
Figure BDA0003280388500000135
Figure BDA0003280388500000136
Initializing laser position x0，iAnd laser speed v0，iI represents the whole Xk＝0The ith candidate solution as a particle;
s2: construction of equation f (x)0，i) Find the best initial solution gbest；
When k is less than the total algebra N of the optimal variant solutioniteWhen for i ═ 1 to NcParticles, at k ≧ 0 iterations, mutation by population x at presentk，iIn-hybrid random solution to create donor vector vk，iThen generating a binomial cross vector u by crossingk，iDonor vector vk，iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000141
wherein r is1、r2And r3Are randomly generated overall indexes, all belonging to {1,2cIs [0,1 ]]A scale factor within the range;
binomial cross vector uk，iThe calculation formula of (a) is as follows:
Figure BDA0003280388500000142
wherein u isk，i，dA binomial cross vector u determined for a drive current parameter d (amplitude or relative phase)k,i，vk,i,dDonor vector v determined for drive current parameter dk,i，xk,i,dDetermined by a drive current parameter dDetermining a candidate solution; r iscIs a random number between 0 and 1 generated during the optimization of each driving current parameter d;
s3: verifying the spectral response of the finally emitted comb-shaped laser wave by adopting a fitness function model f (x) of the candidate solution x if f (u)k,i) The flatness of the comb laser wave provided is superior to the current solution f (x)k,i) I.e. f (u)k,i)<f(xk,i) Adopting a binomial cross vector u)k,iUpdating the candidate solution of the k +1 generation, otherwise adopting the candidate solution xk,iAnd updating the candidate solution of the k +1 th generation of the candidate solution:
Figure BDA0003280388500000143
s4: when for all the totality X with Nc particlesk＝0After the optimization candidate solution of each particle in (1) is finished, updating the step S3 according to the following rule and adopting a binomial cross vector uk，iAnd updating to obtain an optimal candidate solution: if f (u)k，i)<f(gbest) Then, the step S2 is updated to construct the best initial solution gbestIs g'bastAnd g 'are'bastAnd defining the optimal variation solution with the best flatness of the comb laser wave.
Example 4
Based on the embodiment 3, the working frequency of the dual-drive Mach-Zehnder modulator module in the odd harmonic suppression module is 30GHz, and the maximum transmission point V isπ2.5V, at the maximum transmission point (V)DC＝Vπ) Biased to suppress odd harmonics and generate only even harmonics.
Example 5
On the basis of embodiment 3, the first rf amplifying module performs gain switching on the laser driving current emitted by the laser driving current emitting module by using an amplified rf signal with a power of about 18 dBm.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (9)

1. A comb wave generation system for electromagnetic compatibility radiation disturbance comprises a multiple quantum well distributed feedback laser module of a GS mode, an odd harmonic suppression module main control module and a DFB laser transmitter, wherein the multiple quantum well distributed feedback laser module and the odd harmonic suppression module of the GS mode are both electrically connected with the main control module which is electrically connected with the DFB laser transmitter, and the comb wave generation system is characterized in that the multiple quantum well distributed feedback laser module of the GS mode comprises a first laser driving current transmitting module, a first radio frequency amplification module and a direct current bias module, wherein the first laser driving current transmitting module, the first radio frequency amplification module and the direct current bias module can change the coherent optical frequency within the spectral range of 9.5 GHz; the odd harmonic suppression module comprises a second laser driving current emission module, a second radio frequency amplification module, a 0-180-degree phase shift circuit module, a dual-drive Mach-Zehnder modulator module and a polarization controller module, wherein the second laser driving current emission module can change the coherent optical frequency of 19GHz in the spectral range;
the phase shift circuit module with the angle of 0-180 degrees respectively transmits the laser driving signal amplified by the second radio frequency amplification module to one arm and the other arm of the dual-drive Mach-Zehnder modulator module, and the laser driving signal I output by the dual-drive Mach-Zehnder modulator module2(t) and laser driving signal I output by multiple quantum well distributed feedback laser module of GS mode1(t) are combined into a total laser driving current signal I (t) which is transmitted to the main control module, and the total laser driving current signal I (t) is subjected to iterative optimization and then is transmitted to have a complex electric field EGS(t) an optical frequency comb.
2. The electromagnetic compatibility radiation disturbance comb wave generation system according to claim 1, wherein a gain switch laser mode is constructed by a multiple quantum well distributed feedback laser module of the GS modeType, modulating the laser drive current signal I at time t1(t) the master control module employs a complex electric field E with influenceGS(t) index characteristics of flatness of optical frequency comb: amplitude c of constant bias current0N, amplitude chAnd the relative phase between the first N-1 harmonic and the Nth harmonich,NConstructing a final output comb laser wave candidate solution x model with optimal flatness, wherein h is 1,2, …, N-1, and iteratively minimizing the fitness function model f (x) of the candidate solution x to finally obtain an optimal variation solution g 'with optimal comb laser wave flatness after iterative optimization and fitness evaluation'bast。
3. The electromagnetic compatibility radiation disturbance comb wave generation system according to claim 1, wherein a gain switch laser model constructed by the multiple quantum well distributed feedback laser module of the GS mode is:
Figure FDA0003280388490000021
Figure FDA0003280388490000022
Figure FDA0003280388490000023
Figure FDA0003280388490000024
wherein n isinjIs the injection efficiency, VtotThe total volume of the active region and the separate confinement heterostructure of a multiple quantum well distributed feedback laser module being a GS mode, VwIs the volume of the well, τwIs the lifetime of the carriers in the well, τbFor the lifetime of the carriers in the barrier region, τbwIs the capture time, τwbIs the escape time, omega is the differential gain, taupFor photon lifetime, epsilon is the nonlinear gain suppression coefficient, Γ is the optical confinement factor, n0Is the carrier transparency density, nwCarrier density of well bound state, nbIs the carrier density of the bound state of the barrier region, nthIs the threshold carrier density in the well region, RspFor spontaneous emissivity, α is the linewidth enhancement factor, q is the electron charge, S is the photon density, vgθ is the optical phase for group velocity.
4. The electromagnetic compatibility radiation disturbance comb wave generation system according to claim 1, wherein the multiple quantum well distributed feedback laser module of the GS mode outputs a laser drive signal I1The calculation formula of (t) is as follows: i is1(t)＝IDC1(t)+ΔI1sin (2 π × 9.5 t); wherein, IDC1(t) is the constant bias current in the multiple quantum well distributed feedback laser module of the GS mode,. DELTA.I1Distributing a large amplitude in a feedback laser module for the multiple quantum wells of the GS mode;
laser driving signal I output by the dual-drive Mach-Zehnder modulator module2The calculation formula of (t) is as follows: i is2(t)＝IDC2(t)+ΔI2sin (2 π × 19 t); wherein, IDC2(t) is a constant bias current in the dual drive Mach-Zehnder modulator module, Delta I1Is a large amplitude in the dual drive mach-zehnder modulator module;
Figure FDA0003280388490000025
wherein N represents the number of harmonics, c0Is the amplitude of the constant bias current, chAnd phihAmplitude and phase, f, of harmonics, respectively, of the laser drive current signal0The frequency of the laser drive current signal generated for a constant bias current;
after iterative optimization is carried out on the total laser driving current signal I (t), emission has complex powerField EGS(t) in the optical frequency comb of EGSThe calculation formula of (t) is as follows:
Figure FDA0003280388490000031
wherein S (t) is the photon density at time t, VπIs the maximum transmission point v of the dual-drive Mach-Zehnder modulator module under the working frequency1(t) is the voltage across one arm of the dual drive Mach-Zehnder modulator module, v2(t) is the voltage on one arm of the dual drive mach-zehnder modulator module.
5. The EMC radiation disturbance comb wave generation system as recited in claim 4, wherein the candidate solution x model of the comb laser wave is as follows:
x＝[c0 c1 c2 … cN Δφ1，N Δφ2，N … ΔφN-1，N]。
6. the electromagnetic compatibility radiation disturbance comb wave generation system according to claim 1, wherein a calculation formula of the fitness function model f (x) is as follows:
Figure FDA0003280388490000032
wherein the peak power value P of l continuous carrierslThe set P is formed, L is 1,2, …, L, μ is the average value of the set P,
Figure FDA0003280388490000033
7. the emc radiation disturbance comb wave generation system as claimed in claim 1, wherein the main control module iteratively optimizes comb laser wave flatnessFinally obtaining the optimal variation solution g 'with the optimal flatness of the comb laser wave after iterative optimization and fitness evaluation'bastThe method comprises the following steps:
s1: initially, when the number of iterations k is 0, N is usedcGenerating an ensemble of candidate solutions x
Figure FDA0003280388490000034
Figure FDA0003280388490000035
Initializing laser position x0，iAnd laser speed v0，iI represents the whole Xk＝0The ith candidate solution as a particle;
s2: construction of equation f (x)0，i) Find the best initial solution gbest；
When k is less than the total algebra N of the optimal variant solutioniteWhen for i ═ 1 to NcParticles, at k ≧ 0 iterations, mutation by population x at presentk，iIn-hybrid random solution to create donor vector vk，iThen generating a binomial cross vector u by crossingk，iSaid donor vector vk，iThe calculation formula of (a) is as follows:
Figure FDA0003280388490000041
wherein r is1、r2And r3Are randomly generated overall indices, all belonging to {1, 2.., Nc }, where F is [0,1 }]A scale factor within the range;
the binomial cross vector uk，iThe calculation formula of (a) is as follows:
Figure FDA0003280388490000042
wherein u isk,i,dA binomial cross vector u determined for the drive current parameter dk,i，vk,i,dTo drive electricityDonor vector v determined by flow parameter dk,i，xk,i,dCandidate solutions determined for the drive current parameter d; r iscIs a random number between 0 and 1 generated during the optimization of each driving current parameter d;
s3: verifying the spectral response of the finally emitted comb-shaped laser wave by adopting a fitness function model f (x) of the candidate solution x if f (u)k,i) The flatness of the comb laser wave provided is superior to the current solution f (x)k,i) I.e. f (u)k,i)<f(xk,i) Adopting a binomial cross vector u)k,iUpdating the candidate solution of the k +1 generation, otherwise adopting the candidate solution xk，iAnd updating the candidate solution of the k +1 th generation of the candidate solution:
Figure FDA0003280388490000043
s4: when for all the totality X with Nc particlesk＝0After the optimization candidate solution of each particle in (1) is finished, updating the step S3 according to the following rule and adopting a binomial cross vector uk,iAnd updating to obtain an optimal candidate solution: if f (u)k，i)<f(gbest) Updating the optimal initial solution g constructed in the step S2bestIs g'bastAnd g 'are'bastAnd defining the optimal variation solution with the best flatness of the comb laser wave.
8. The electromagnetic compatibility comb wave generation system for radiation disturbance according to claim 1, wherein an operating frequency of a dual drive mach-zehnder modulator module in the odd harmonic suppression module is 30GHz, and a maximum transmission point V is providedπ2.5V, biased at the maximum transmission point to suppress odd harmonics and generate only even harmonics.
9. The electromagnetic compatibility radiation disturbance comb wave generation system according to claim 1, wherein the first rf amplification module performs gain switching on the laser drive current emitted by the laser drive current emission module using an amplified rf signal having a power of about 18 dBm.
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