Multi-channel phase demodulation control system for coherent combination and control method thereof

Abstract

The invention relates to the technical field of strong laser coherent synthesis, in particular to a multipath phase demodulation control system for coherent synthesis and a control method thereof.The demodulation control system comprises a beam splitting module, N phase modulators, N amplifiers, a beam combining module, a 90-degree optical mixer, a detector and a processing unit; the phase modulator is used for modulating phases of the sub-beams, the amplifiers are respectively used for amplifying optical power of the sub-beams, the beam combining module is used for combining light, the 90-degree optical mixer is used for coherent frequency mixing processing so as to output an in-phase signal I and an orthogonal signal Q, and the detector is used for converting the in-phase signal I and the orthogonal signal Q into electric signals. And the processing unit is used for performing signal processing on the in-phase signal I and the orthogonal signal Q which are subjected to photoelectric conversion processing so as to output a phase compensation amount delta phi. According to the invention, the output of the 90-degree optical mixer is fixed and sampled twice, so that rapid locking of respective phases of multiple optical paths in coherent combination can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of strong laser coherent synthesis, and in particular to a multi-channel phase demodulation control system for coherent synthesis and a control method thereof. Background Art

[0002] In the field of coherent synthesis, for the coherent synthesis system, each light path needs to be phase controlled to ensure that the phases of each light path are consistent, so that coherently grown synthesized light can be obtained at the synthesis end. However, since each light path will pass through an amplifier to enhance its power, the amplification process will also introduce phase noise (generally in the kHz order). Therefore, the phase of each light path needs to be controlled in real time to ensure that the overall synthesized output light intensity is the strongest.

[0003] Phase control is generally achieved by splitting a portion of the synthesized light beam as feedback light, iterating the algorithm based on the light intensity information of the feedback light (e.g., random parallel gradient descent (SPGD), multi-jitter method, heuristic algorithm, etc.), and optimizing the feedback light intensity to achieve phase locking (e.g., Figure 1 shown);

[0004] Among them: the multi-jitter method draws on the modulation and demodulation ideas in the coherent optical communication system. First, a small-amplitude sinusoidal disturbance signal of different frequencies is applied to the phase modulator of each channel, and then the light of each channel is synthesized to obtain a synthetic light with a disturbance signal;

[0005] E u (t) = E u0 cos(ω L t+φ u );

[0006] E i (t) = E i0 cos(ω L t+φ i +β i sin(ω i t));

[0007]

[0008] E u (t) represents the original light field, E u0 represents the amplitude of the original light field, φ u represents the initial phase of the original light field, ω L represents the light frequency, β i represents the amplitude of the i-th disturbance signal, ω i represents the frequency of the i-th disturbance signal, E i (t) represents the phase modulated light field, E i0 represents the amplitude of the phase modulated light field, φ irepresents the initial phase of the phase-modulated light field, t represents the time, I(t) represents the intensity of the coupled light field, ε0 represents the vacuum dielectric constant, and μ0 represents the vacuum magnetic permeability;

[0009] After the synthesized signal is converted into an electrical signal by the radio and television detector, it is multiplied and integrated with the disturbance signal originally applied to each channel to obtain the feedback amount of each channel. This feedback amount will be proportional to the sine value of the phase of other channels and its own phase, and then it is iterated according to this amount until the phase difference of each channel is close to 0;

[0010] However, these algorithms have the following disadvantages:

[0011] 1. Stochastic Parallel Gradient Descent (SPGD): a. Inefficient iterative process: Traditional optimization algorithms such as the SPGD algorithm rely on stochastic gradient exploration to perform multi-step iterations and then perform polarization control. The number of iterations is large and the path is completely random and unpredictable, and it increases with the increase of the number of channels N, making the polarization control efficiency low. b. Low control bandwidth: Traditional SPGD algorithms require multi-step iterations, and the number of iterations is affected by different initial phases, resulting in low control bandwidth and the need to adjust hyperparameters: Traditional SPGD algorithms need to adjust the feedback coefficient. The feedback coefficient corresponding to different coefficients will change, and hyperparameter adjustment is required to work properly.

[0012] 2. Multi-jitter method: a. The number of iteration steps increases with the increase of the number of paths. Since the feedback quantity of the multi-jitter method is not the direct phase difference, but the sum of the sinusoids of the phase difference, it requires multiple iterations to approach zero. The number of iteration steps will also increase with the increase of the number of paths. b. Additional hyperparameter adjustment is required. Different systems or different power levels of the same system may require additional hyperparameter adjustment to achieve phase locking. Summary of the invention

[0013] The technical problem to be solved by the present invention is: in order to solve the technical problem that the existing random parallel gradient descent method and multi-jitter method of multi-channel phase demodulation have low iteration efficiency and require additional hyperparameter adjustment, the present invention provides a multi-channel phase demodulation control system for coherent synthesis and a control method thereof. By improving the multi-channel phase demodulation control method, the iteration efficiency of multi-channel phase demodulation can be improved, and no additional hyperparameter adjustment is required.

[0014] The technical solution adopted by the present invention to solve the technical problem is: a multi-channel phase demodulation control system for coherent synthesis, comprising: a beam splitting module, N phase modulators, N amplifiers, a beam combining module, a 90° optical mixer, a detector, and a processing unit, wherein the beam splitting module is used to split the input seed light into N+1 sub-beams, the N phase modulators are used to modulate the phases of the N sub-beams respectively, the N amplifiers are used to amplify the optical power of the N sub-beams after phase modulation respectively, the beam combining module is used to combine the N sub-beams after amplifying the optical power into CBC synthesized light, and the 90 °The optical mixer is used to perform coherent mixing processing on the 1-way sub-beam after being split by the beam splitting module and the part of the CBC synthetic light after being synthesized by the beam combining module, so as to output an in-phase signal I and an orthogonal signal Q. The detector is used to convert the in-phase signal I and the orthogonal signal Q into electrical signals. The processing unit is used to perform signal processing on the in-phase signal I and the orthogonal signal Q after the photoelectric conversion processing, so as to output a phase compensation amount Δφ, and use the phase compensation amount Δφ as the phase modulation amount of the phase modulator; wherein: the other part of the CBC synthetic light synthesized by the beam combining module is used as the output light.

[0015] Therefore, by fixing the output of the twice-sampled 90° optical mixer, the relationship between the phase delay of each path and the synthesized optical signal is established to ensure that the synthesized light beam is stable at the maximum light intensity. This can achieve rapid locking of the phases of multiple optical paths in coherent synthesis, improve the iterative efficiency of multi-path phase demodulation, and eliminate the need for additional hyperparameter adjustment.

[0016] Furthermore, the processing unit includes: an ADC, a central processing module and a DAC, wherein the ADC is used to convert an analog signal into a digital signal, the central processing module is used to perform signal processing on an in-phase signal I and an orthogonal signal Q to obtain a phase compensation amount Δφ, and the DAC is used to convert a digital signal into an analog signal.

[0017] A control method for a multi-channel phase demodulation control system for coherent synthesis comprises the following steps:

[0018] S1. Obtain the signal of each channel and perform sinusoidal modulation to obtain the light field E after phase modulation and passing through the beam splitting module. k (t);

[0019] S2, obtain the light field E in S1 k (t) and collecting the in-phase signal I and the quadrature signal Q after the coherent mixing process of the 90° optical mixer, so as to calculate the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the quadrature signal Q;

[0020] S3, obtaining the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the orthogonal signal Q in S2, so as to calculate the in-phase feedback signal S of the kth path of the in-phase signal I Ik and the k-th orthogonal feedback signal S of the orthogonal signal Q Qk ;

[0021] S4, obtaining the k-th in-phase feedback signal S of the in-phase signal I in S3 Ik and the k-th orthogonal feedback signal S of the orthogonal signal Q Qk , to calculate the phase difference S between the current k-th path and the reference path IQk ;

[0022] S5. Obtain the phase difference S between the current k-th path and the reference path in S4 IQk , and perform inverse tangent processing to calculate the phase compensation amount Δφ.

[0023] Therefore, a phase digital twin model of multi-channel coherent synthesis is established, which can be directly optimized in the digital domain to find the optimal phase control amount for each channel, so that the phases of all channels can be quickly restored to consistency, and the time required for phase control is consistent for any number of channels, solving the dilemma of traditional phase control algorithms that the control bandwidth decreases with the increase of optical paths, and no additional hyperparameter adjustment is required.

[0024] Furthermore, in S1, the reference light field E ref The calculation formula of (t) is:

[0025] E ref (t) = A ref cos(ω L t+φ ref );

[0026] Among them: A ref represents the amplitude of the sinusoidal perturbation applied by the kth beam, ω L represents the light frequency, t represents time, φ ref represents the initial phase of the sinusoidal perturbation applied to the kth beam.

[0027] Furthermore, in S1, the light field E k The calculation formula of (t) is:

[0028] E k (t) = A k cos(ω L t+φ k +β k sin(ω k t));

[0029] Among them: A krepresents the amplitude of the kth beam without sinusoidal perturbation, φ k represents the initial phase of the kth beam without sinusoidal perturbation, β k represents the amplitude of the k-th disturbance signal, ω k Represents the frequency of the kth disturbance signal.

[0030] Furthermore, in S2, the calculation formula of the light intensity I(t) of the in-phase signal I is:

[0031]

[0032] The calculation formula of the light intensity Q(t) of the orthogonal signal Q is:

[0033]

[0034] Where: ε0 represents the vacuum dielectric constant, μ0 represents the vacuum magnetic permeability.

[0035] Furthermore, in S3, the k-th in-phase feedback signal S of the in-phase signal I Ik The calculation formula is:

[0036]

[0037] The k-th orthogonal feedback signal S of the orthogonal signal Q Qk The calculation formula is:

[0038]

[0039] Where: τ represents the integration time.

[0040] Furthermore, in S4, the phase difference S between the current k-th path and the reference path IQk The calculation formula is:

[0041] S IQk =S Ik -S Qk .

[0042] Furthermore, in S5, the calculation formula of the phase compensation amount Δφ is:

[0043] Δφ=-(φ ref -φ k ).

[0044] Furthermore, CBC synthesizes light CBC The calculation formula is:

[0045] I CBC =|∑ k E k (t)| 2 .

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. The present invention fixes the output of the 90° optical mixer sampled twice, establishes the relationship between the phase delay of each channel and the synthesized optical signal, ensures that the synthesized light beam is stable at the maximum light intensity, can achieve rapid locking of the phases of multiple optical paths in coherent synthesis, can improve the iterative efficiency of multi-channel phase demodulation, and does not require additional hyperparameter adjustment.

[0048] 2. The present invention establishes a phase digital twin model of multi-channel coherent synthesis, which can be directly optimized in the digital domain to find the optimal phase control amount for each channel, so that the phases of all channels can be quickly restored to consistency, and the time required for phase control is consistent for any number of channels, solving the dilemma of traditional phase control algorithms that the control bandwidth decreases with the increase of optical paths, and no additional hyperparameter adjustment is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0050] Figure 1 It is a framework diagram of a multi-channel phase demodulation control system for coherent synthesis in the prior art;

[0051] Figure 2 It is a framework diagram of a multi-channel phase demodulation control system for coherent synthesis of the present invention;

[0052] Figure 3 A flow chart of a control method of a multi-channel phase demodulation control system for coherent synthesis according to the present invention;

[0053] Figure 4 It is a comparison diagram between the phase fast demodulation method of the present invention and the multi-jitter method.

[0054] In the figure: 1. beam splitting module; 2. phase modulator; 3. amplifier; 4. beam combining module; 5. 90° optical mixer; 6. detector; 7. processing unit; 701. ADC; 702. central processing module; 703. DAC. DETAILED DESCRIPTION

[0055] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] like Figure 2As shown, a multi-channel phase demodulation control system for coherent synthesis includes: a beam splitting module 1, N phase modulators 2, N amplifiers 3, a beam combining module 4, a 90° optical mixer 5, a detector 6 and a processing unit 7, the beam splitting module 1 is used to split the input seed light into N+1 sub-beams, the N phase modulators 2 are used to modulate the phases of the N sub-beams, the N amplifiers 3 are used to amplify the optical power of the N sub-beams after phase modulation, the beam combining module 4 is used to combine the N sub-beams after amplifying the optical power into CBC synthesized light, and the 90° optical mixer 5 is used to The 1-way sub-beam after beam splitting and the part of CBC synthesized light synthesized by the beam combining module 4 are subjected to coherent mixing processing to output an in-phase signal I and an orthogonal signal Q. The detector 6 is used to convert the in-phase signal (In-phase) I and the orthogonal signal Q into electrical signals. The processing unit 7 is used to perform signal processing on the in-phase signal I and the orthogonal signal (Quadrature) Q after the photoelectric conversion processing to output a phase compensation amount Δφ, and use the phase compensation amount Δφ as the phase modulation amount of the phase modulator 2; wherein: the other part of the CBC synthesized light synthesized by the beam combining module 4 is used as the output light. Therefore, by fixing the output of the 90° optical mixer for two samplings (i.e., the number of samplings under any number of channels is fixed and will not change), the relationship between the phase delay amount of each channel and the synthesized optical signal is established (i.e., the phase compensation amount Δφ, the phase of each light channel of any multi-channel coherent synthesis is adjusted to be consistent with the phase of the reference light), ensuring that the synthesized light beam is stable at the maximum light intensity, and can achieve rapid locking of the phases of each of the multiple light channels in coherent synthesis, can improve the iterative efficiency of multi-channel phase demodulation (i.e., the number of iteration steps will not increase with the increase of the number of channels N), and no additional hyperparameter adjustment is required, and the problem of low control bandwidth in the prior art can be solved.

[0059] In other words, compared with the non-polarization-maintaining synthesis system corresponding to the traditional algorithm, the multi-channel phase demodulation control system adds a 90° optical mixer at the feedback point; compared with the non-polarization-maintaining synthesis system corresponding to the traditional algorithm, the multi-channel phase demodulation control system first applies small-amplitude sinusoidal disturbance signals of different frequencies to the phase modulator of each light channel, and on the basis of the non-polarization-maintaining synthesis system, adds a reference channel at the input point together with part of the CBC synthetic light split out as the input of the 90° optical mixer, and the two output channels of the 90° optical mixer are respectively input to the signal acquisition point through the detector for digital signal processing, and the respective disturbance signals are multiplied and integrated to obtain the feedback amount.

[0060] Specifically, the beam splitting module splits the seed light into multiple paths, the phase modulator is used to control the phase of each light beam, the amplification part amplifies each light path separately, and the beam combining module combines each light path to finally obtain a high-power output light of coherent combination (CBC); the 90° optical mixer is used to construct a phase control feedback loop, and the input has two parts, one beam split light path and part of the CBC synthesized light. The in-phase signal I and the orthogonal signal Q output by the detector are digitally processed by the processing unit to obtain the phase control signal, which is loaded onto the phase modulator of each path to ensure the consistency of the phase of each path.

[0061] Specifically, the 1-way sub-beam after being split by the beam splitting module 1 refers to: the reference beam, and this sub-beam is inconsistent with the N-way sub-beams that need phase modulation (that is, in the N+1-way sub-beams, N-way is used as phase modulation, and 1-way is used as a reference beam); the partial CBC synthesized light after being synthesized by the beam combining module 4 refers to: any one of the N-way sub-beams.

[0062] For example, seed light includes: continuous light and pulse seed light, which can perform synthesized light with the same architecture for high repetition rate pulse signals or continuous light signals; the beam splitting module adopts beam splitters, fiber beam splitters (devices made of all optical fibers), diffractive optical elements (DOEs), and polarization beam splitters (spatial light synthesis); the phase modulator adopts lithium niobate crystal modulators, piezoelectric ceramic (PZT) fiber phase modulators, spatial optical phase modulators and other devices that can adjust the phase of light; the beam combining module adopts beam combiners, fiber beam combiners (devices made of all optical fibers), and polarization beam combiners (spatial light synthesis); the 90° optical mixer can be an output of two ports or four ports, and only two detectors are needed for the output of the four ports to obtain the feedback electrical signals of the two in-phase signals I and the orthogonal signals Q; the detectors adopt photodetectors (PDs) and balanced detectors (BPDs).

[0063] In this embodiment, the processing unit 7 includes: ADC701 (A / D converter, analog-to-digital converter), a central processing module 702 and DAC703 (D / A converter, digital-to-analog converter), ADC701 is used to convert an analog signal into a digital signal, the central processing module 702 is used to perform signal processing on the in-phase signal I and the orthogonal signal Q to obtain a phase compensation amount Δφ, and DAC703 is used to convert a digital signal into an analog signal.

[0064] For example, the ADC can also be replaced by an acquisition card or other device that can convert analog electrical signals into digital electrical signals; the central processing module uses a field programmable gate array (FPGA), a single-chip microcomputer MCU or any device with signal processing computing capabilities; the DAC can also be replaced by a device that converts digital electrical signals into analog electrical signals.

[0065] like Figure 3 to Figure 4 As shown, a control method for a multi-channel phase demodulation control system for coherent synthesis includes the following steps:

[0066] S1. Obtain the signal of each channel and perform sinusoidal modulation to obtain the light field E after phase modulation and passing through the beam splitting module. k (T);

[0067] S2, obtain the light field E in S1 k (t) and collecting the in-phase signal I and the quadrature signal Q after the coherent mixing process of the 90° optical mixer (5) to calculate the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the quadrature signal Q;

[0068] S3, obtaining the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the orthogonal signal Q in S2, so as to calculate the in-phase feedback signal S of the kth path of the in-phase signal I Ik and the k-th orthogonal feedback signal S of the orthogonal signal Q Qk ;

[0069] S4, obtaining the k-th in-phase feedback signal S of the in-phase signal I in S3 Ik and the Kth orthogonal feedback signal S of the orthogonal signal Q Qk , to calculate the phase difference S between the current k-th path and the reference path IQk ;

[0070] S5. Obtain the phase difference S between the current k-th path and the reference path in S4 IQk , and perform inverse tangent processing to calculate the phase compensation Δφ. Thus, a phase digital twin model of multi-channel coherent synthesis is established, which can directly optimize in the digital domain (i.e., phase compensation Δφ) and find the optimal phase control amount for each channel, so that the phases of all channels can be quickly restored to consistency, and the time required for phase control is consistent under any number of channels (i.e., not affected by the number of beam splitting sub-beam channels), solving the dilemma of the traditional phase control algorithm that the control bandwidth decreases with the increase of optical channels, and no additional hyperparameter adjustment is required.

[0071] In other words, through a multi-channel phase demodulation control system, a phase digital twin model of each channel can be established based on two fixed adoptions, thereby optimizing the phase control amount in the digital domain, ensuring that the optical power after synthesis is stable at the maximum value, and making the phase of each optical channel consistent, thereby obtaining a high-power coherent synthesized optical output.

[0072] It should be noted that: each time coherent synthesis is performed, S1-S5 needs to be executed.

[0073] In this embodiment, in S1, the reference light field Eref The calculation formula of (t) is:

[0074] E ref (t) = A ref cos(ω L t+φ ref );

[0075] Light Field E k The calculation formula of (t) is:

[0076] E k (t) = A k cos(ω L t+φ k +β k sin(ω k t));

[0077] Among them: A ref represents the amplitude of the sinusoidal perturbation applied by the kth beam, ω L represents the light frequency, t represents the time, φ ref represents the initial phase of the sinusoidal perturbation applied to the kth beam, A k represents the amplitude of the kth beam without sinusoidal perturbation, φ k represents the initial phase of the kth beam without sinusoidal perturbation, β k represents the amplitude of the k-th disturbance signal, ω k Represents the frequency of the kth disturbance signal.

[0078] In this embodiment, in S2, the calculation formula of the light intensity I(t) of the in-phase signal I is:

[0079]

[0080] The calculation formula of the light intensity Q(t) of the orthogonal signal Q is:

[0081]

[0082] Where: ε0 represents the vacuum dielectric constant, μ0 represents the vacuum magnetic permeability.

[0083] In this embodiment, in S3, the k-th in-phase feedback signal S of the in-phase signal I Ik The calculation formula is:

[0084]

[0085] The k-th orthogonal feedback signal S of the orthogonal signal Q Qk The calculation formula is:

[0086]

[0087] Where: τ represents the integration time.

[0088] In this embodiment, in S4, the phase difference S between the current k-th path and the reference path IQk The calculation formula is:

[0089] S IQk =S Ik -S Qk .

[0090] In this embodiment, in S5, the calculation formula of the phase compensation amount Δφ is:

[0091] Δφ=-(φ ref -φ k ).

[0092] In this embodiment, CBC synthesizes light CBC The calculation formula is:

[0093] I CBC =|∑ k E k (t)| 2 .

[0094] Specifically, according to CBC synthesis light I CBC The calculation formula can be obtained that only when all the k-th beams have no initial phase φ applied with sinusoidal perturbations k When all are equal, CBC synthesizes light I CBC can be maximized (that is, the composite light beam reaches the maximum intensity).

[0095] It should be noted that: 1. This application is also applicable to increasing spectrum broadening before beam splitting, or increasing optical path adjustment in each path, and the synthesis method can also be split aperture synthesis or common aperture synthesis;

[0096] 2. This application is also applicable to systems with amplification. Generally, coherent synthesis systems have an amplification stage for power amplification. This application is also applicable to optical path systems with an amplification stage.

[0097] 3. If Figure 4 As shown, the red curve directly calculates the phase compensation amount of each channel through the digital model after two integration cycles, thereby directly recovering the phase (that is, after two samplings, the phase to be compensated for each channel is calculated through digital signal processing, thereby directly recovering the corresponding phase of each channel), while the multi-jitter method requires multiple iterations. The present application reduces the phase recovery time (that is, even if the number of channels is expanded, the two-step demodulation phase can be maintained), significantly improves the phase-locking speed, greatly improves the system control bandwidth, and is suitable for large-scale coherent synthesis expansion.

[0098] To summarize, the present invention establishes the relationship between the phase delay of each path and the synthesized optical signal by fixing the output of the 90° optical mixer sampled twice, ensures that the synthesized light beam is stable at the maximum light intensity, can realize the rapid locking of the phases of multiple optical paths in coherent synthesis, can improve the iterative efficiency of multi-path phase demodulation, and does not require additional hyperparameter adjustment; a phase digital twin model of multi-path coherent synthesis is established, which can be directly optimized in the digital domain to find the optimal phase control amount for each path, so that the phases of all paths can be quickly restored to consistency, and the time required for phase control is consistent for any number of paths, which solves the dilemma that the control bandwidth of the traditional phase control algorithm decreases with the increase of optical paths, and does not require additional hyperparameter adjustment.

[0099] The above description is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A multi-channel phase demodulation control system for coherent synthesis, characterized in that: include: A beam splitting module (1), the beam splitting module (1) being used to split the input seed light into N+1 sub-beams; N phase modulators (2), wherein the N phase modulators (2) are respectively used to modulate the phases of N sub-beams; N amplifiers (3), wherein the N amplifiers (3) are respectively used to amplify the optical power of N sub-light beams after phase modulation; A beam combining module (4), the beam combining module (4) is used to combine N sub-beams after amplifying the optical power into a CBC composite light I CBC ; A 90° optical mixer (5), the 90° optical mixer (5) being used to perform coherent mixing processing on a sub-beam split by the beam splitting module (1) and a portion of the CBC synthesized light synthesized by the beam combining module (4), so as to output an in-phase signal I and an orthogonal signal Q; A detector (6), the detector (6) being used to convert the in-phase signal I and the quadrature signal Q into electrical signals; A processing unit (7), the processing unit (7) is used to perform signal processing on the in-phase signal I and the quadrature signal Q after the photoelectric conversion process, so as to output a phase compensation amount Δφ, and use the phase compensation amount Δφ as the phase modulation amount of the phase modulator (2); Wherein: another part of the CBC synthesized light synthesized by the beam combining module (4) is used as output light.

2. The multi-channel phase demodulation control system for coherent synthesis according to claim 1, characterized in that: The processing unit (7) comprises: An ADC (701), a central processing module (702) and a DAC (703), wherein the ADC (701) is used to convert an analog signal into a digital signal, the central processing module (702) is used to perform signal processing on an in-phase signal I and an orthogonal signal Q to obtain a phase compensation amount Δφ, and the DAC (703) is used to convert a digital signal into an analog signal.

3. A control method for a multi-channel phase demodulation control system for coherent synthesis according to claims 1-2, characterized in that: The following steps are involved: S1. Obtain the signal of each channel and perform sinusoidal modulation to obtain the light field E after phase modulation and passing through the beam splitting module. k (t); S2, obtain the light field E in S1 k (t) and collecting the in-phase signal I and the quadrature signal Q after the coherent mixing process of the 90° optical mixer (5) to calculate the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the quadrature signal Q; S3, obtaining the light intensity I(t) of the in-phase signal I and the light intensity Q(t) of the orthogonal signal Q in S2, so as to calculate the in-phase feedback signal S of the kth path of the in-phase signal I Ik and the k-th orthogonal feedback signal S of the orthogonal signal Q Qk ; S4, obtaining the k-th in-phase feedback signal S of the in-phase signal I in S3 Ik and the k-th orthogonal feedback signal S of the orthogonal signal Q Qk , to calculate the phase difference S between the current k-th path and the reference path IQk ; S5. Obtain the phase difference S between the current k-th path and the reference path in S4 IQk , and perform inverse tangent processing to calculate the phase compensation amount Δφ.

4. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S1, the reference light field E ref The calculation formula of (t) is: E ref (t)=A ref cos(ω L t+φ ref ); Among them: A ref represents the amplitude of the sinusoidal perturbation applied by the kth beam, ω L represents the light frequency, t represents time, φ ref represents the initial phase of the sinusoidal perturbation applied to the kth beam.

5. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S1, the light field E k The calculation formula of (t) is: E k (t)=A k cos(ω L t+φ k +b k sin(ω k t)); Among them: A k represents the amplitude of the kth beam without sinusoidal perturbation, φ k represents the initial phase of the kth beam without sinusoidal perturbation, β k represents the amplitude of the k-th disturbance signal, ω k Represents the frequency of the kth disturbance signal.

6. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S2, the calculation formula of the light intensity I(t) of the in-phase signal I is: The calculation formula of the light intensity Q(t) of the orthogonal signal Q is: Where: ε0 represents the vacuum dielectric constant, μ0 represents the vacuum magnetic permeability.

7. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S3, the k-th in-phase feedback signal S of the in-phase signal I Ik The calculation formula is: The k-th orthogonal feedback signal S of the orthogonal signal Q Qk The calculation formula is: Where: τ represents the integration time.

8. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S4, the phase difference between the current k-th path and the reference path is S IQk The calculation formula is: S IQk =S Ik -S Qk 。 9. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: In S5, the calculation formula of the phase compensation amount Δφ is: Δφ=-(φ ref -f k )。 10. The control method of the multi-channel phase demodulation control system for coherent synthesis according to claim 3, characterized in that: CBC Synthetic Light I CBC The calculation formula is: I CBC =|∑ k E k (t)| 2 。

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