A photonic computing device with error-correctable spatial-frequency parallelism

Abstract

The present application discloses a photon computing device that can correct errors in space-frequency domain parallelism, and relates to the field of photon computing technology. The device includes: receiving a plurality of multi-wavelength optical signals, and performing a first matrix operation on each input multi-wavelength optical signal; during the processing, an amplitude phase frequency response control unit uses the periodic response of a micro-ring structure in the frequency domain to perform frequency array processing on each multi-wavelength optical signal; and performs optical switching processing and / or a second matrix operation processing on the processed optical signal to obtain a target optical signal. The present invention uses the periodic response of the amplitude phase frequency response control unit in the frequency domain to perform frequency domain array processing on each optical signal, so that the target optical signal can be obtained based on the processed optical signal, solving the technical problems that the optical processing of the photon computing system in the prior art cannot realize monitoring and error correction of the processing process, resulting in low reliability, and cannot fully utilize the space domain and frequency domain, resulting in low processing efficiency.

Description

Technical Field

[0001] The present application relates to the field of photon computing technology, and in particular to a photon computing device capable of error-correcting spatial-frequency domain parallelism. Background Art

[0002] In recent years, with the development of artificial intelligence and broadband network communications, the requirements for existing computing performance have continued to increase. Among them, photonic computing has unique advantages in the fields of matrix operations and neural network training, and has always been the focus of research in this field. Existing photonic computing units have the characteristics of fast speed, low processing loss, and highly parallel processing. They can perform parallel calculations in multiple dimensions such as wavelength and space, accelerating the training process of neural networks. At present, for complex optical computing systems, the phase alignment of spatial processing may require fine adjustment and calibration, which increases the difficulty of system design and debugging.

[0003] In the existing scheme, a phase shifter and a coupler can be combined to form a reconfigurable optical filter chip to realize multiple filter functions and improve the reconfigurability of the system. However, the existing optical computing system still has problems such as low wavelength stability and low wavelength alignment accuracy in frequency domain processing. The wavelength of light may be affected by environmental factors such as temperature and thermal expansion of optical materials, causing wavelength deviation. Inaccurate wavelength alignment may lead to errors in signal transmission and processing, and also increase the difficulty of system design and debugging.

[0004] Therefore, reliability is a pain point in optical processing, and existing optical computing systems have not yet involved powerful error correction capabilities. In addition, optical processing in the frequency domain usually cannot fully utilize the frequency domain, requiring each optical processing unit to correspond to one operation, resulting in low processing efficiency.

[0005] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of this application is to provide a spatial-frequency domain parallel photonic computing device that can correct errors, aiming to solve the technical problems that the optical processing of the photonic computer system in the prior art cannot monitor and correct the processing process, resulting in low reliability, and cannot fully utilize the spatial and frequency domains, resulting in low processing efficiency.

[0007] To achieve the above-mentioned purpose, the present application proposes a photon computing device capable of error correction in space-frequency domain parallelism, the device comprising: a first switching matrix operation unit, an amplitude-phase-frequency response control unit, and a second switching matrix operation unit; the first switching matrix operation unit and the second switching matrix operation unit are connected via the amplitude-phase-frequency response control unit; the first switching matrix operation unit and the second switching matrix operation unit are both multi-channel switching matrix structures;

[0008] The first switching matrix operation unit is used to receive a plurality of multi-wavelength optical signals and perform optical switching processing and / or first matrix operation processing on each input multi-wavelength optical signal;

[0009] The amplitude phase frequency response control unit is used to perform frequency array processing on each of the multi-wavelength optical signals by utilizing the periodic response of the micro-ring structure in the frequency domain during the processing, and to reversely obtain the processing result of the intermediate wavelength optical signal based on the optical signals of the first and last wavelengths when the processing is completed;

[0010] The second switching matrix operation unit is used to perform optical switching processing and / or second matrix operation processing on the processed optical signal to obtain a target optical signal.

[0011] In one embodiment, the first switching matrix operation unit and the second switching matrix operation unit are both composed of a plurality of MZI type unitary matrix operation subunits; each MZI type unitary matrix operation subunit in the first switching matrix operation unit and the second switching matrix operation unit is connected by a waveguide in a topological cascade manner;

[0012] Each of the MZI type unitary matrix operator units is composed of a first input end, a second input end, a first output end, a second output end, a first coupler, a second coupler and a first phase shifter; two optical waveguides are arranged between the first coupler and the second coupler, and the first phase shifter is arranged on one of the two optical waveguides;

[0013] The MZI unitary matrix operator unit is used to determine the current working state based on the phase difference between the upper and lower arms of the first phase shifter, and the current working state includes: a through state, a cross state and a coupling state;

[0014] The MZI type unitary matrix operator unit is also used to control the output of the target optical signal according to the current working state.

[0015] In one embodiment, the MZI type unitary matrix operator unit is used to control the optical signals input from the first input end and the second input end to be output from the first output end and the second output end respectively when the current working state is a through state;

[0016] The MZI type unitary matrix operator unit is further used to control the optical signals input from the first input end and the second input end to be output from the second output end and the first output end respectively when the current working state is a cross state;

[0017] The MZI unitary matrix operator unit is further used to control the optical signals input from the first input end and the second input end to be output from the first output end and the second output end according to a preset splitting ratio when the current working state is a coupled state.

[0018] In one embodiment, the amplitude-phase-frequency response control unit is composed of a first MZI-type unitary matrix operator unit, a second MZI-type unitary matrix operator unit, and a third MZI-type unitary matrix operator unit;

[0019] The first MZI type unitary matrix operator unit is provided with a third coupler, a fourth coupler and a second phase shifter, two optical waveguides are provided between the third coupler and the fourth coupler, and the second phase shifter is provided on one of the two optical waveguides;

[0020] The second MZI type unitary matrix operator unit is provided with a fifth coupler, a sixth coupler and a third phase shifter, two optical waveguides are provided between the fifth coupler and the sixth coupler, and the third phase shifter is provided on one of the two optical waveguides;

[0021] The third MZI type unitary matrix operator unit is provided with a seventh coupler, an eighth coupler and a fourth phase shifter, two optical waveguides are provided between the seventh coupler and the eighth coupler, and the fourth phase shifter is provided on one of the two optical waveguides;

[0022] The first MZI type unitary matrix operator unit, the second MZI type unitary matrix operator unit and the third MZI type unitary matrix operator unit are connected by an optical waveguide, a fifth phase shifter is arranged between the third coupler and the fifth coupler, a sixth phase shifter is arranged between the fourth coupler and the sixth coupler, a seventh phase shifter is arranged between the fifth coupler and the seventh coupler, and an eighth phase shifter is arranged between the sixth coupler and the eighth coupler.

[0023] In one embodiment, the amplitude, phase, and frequency response control unit is a reconfigurable micro-ring structure; the amplitude, phase, and frequency response control unit is used to jointly adjust the power of the input optical signal through the second phase shifter, the third phase shifter, and the fourth phase shifter;

[0024] The amplitude, phase and frequency response control unit is further used to adjust the group delay of the input optical signal when configured as an all-pass filter.

[0025] In one embodiment, the amplitude phase frequency response control unit is further used to adjust the phases of the third phase shifter and the fourth phase shifter to a target phase; wherein, when the third phase shifter and the fourth phase shifter are in the target phase, the second MZI type unitary matrix operator unit is in a through state or a coupled state, the third MZI type unitary matrix operator unit is in a cross state, and the amplitude phase frequency response control unit is configured as a target single-loop filter;

[0026] The amplitude, phase and frequency response control unit is further used to perform translation adjustment on the spectrum response of the target single-loop filter based on the fifth phase shifter and the sixth phase shifter.

[0027] In one embodiment, a photodetector is provided in the third MZI type unitary matrix operator unit, and the photodetector is used to monitor the working state of the amplitude, phase, and frequency response control unit, and provide feedback by reading the current value, so that the amplitude, phase, and frequency response control unit is in an expected working state during the processing of photon computing, so as to realize the error-correctable characteristics of the optical computing process.

[0028] In one embodiment, the micro-ring structure is composed of a fourth MZI type unitary matrix operator unit and a fifth MZI type unitary matrix operator unit;

[0029] The fourth MZI type unitary matrix operator unit is provided with a ninth coupler, a tenth coupler and a ninth phase shifter, two optical waveguides are provided between the ninth coupler and the tenth coupler, and the ninth phase shifter is provided on one of the two optical waveguides;

[0030] The fifth MZI unitary matrix operator unit is provided with an eleventh coupler, a twelfth coupler and a tenth phase shifter, two optical waveguides are provided between the eleventh coupler and the twelfth coupler, and the tenth phase shifter is provided on one of the two optical waveguides;

[0031] The micro-ring structure is connected by the fourth MZI type unitary matrix operator unit and the fifth MZI type unitary matrix operator unit through an optical waveguide, an eleventh phase shifter is arranged between the ninth coupler and the eleventh coupler, and a twelfth phase shifter is arranged between the tenth coupler and the twelfth coupler.

[0032] In one embodiment, the micro-ring structure is used to adjust the spectrum response through the eleventh phase shifter and the twelfth phase shifter.

[0033] In one embodiment, materials of the first to fifth MZI type unitary matrix operator units include, but are not limited to: silicon on insulator, silicon nitride, and lithium niobate.

[0034] The present application provides a photon computing device capable of error correction in space-frequency domain parallelism. The present application discloses a first exchange matrix operation unit, an amplitude phase frequency response control unit, and a second exchange matrix operation unit; the first exchange matrix operation unit is used to receive a plurality of multi-wavelength optical signals, and perform optical exchange processing and / or first matrix operation processing on each input multi-wavelength optical signal; the amplitude phase frequency response control unit is used to perform frequency array processing on each multi-wavelength optical signal by using the periodic response of a micro-ring structure in the frequency domain during the processing, and to reversely obtain the processing result of the intermediate wavelength optical signal based on the optical signals of the first and last two wavelengths when the processing is completed. result; a second exchange matrix operation unit is used to perform optical exchange processing and / or second matrix operation processing on the processed optical signal to obtain a target optical signal; because the present invention uses the periodic response of the amplitude, phase and frequency response control unit in the frequency domain to perform frequency domain array processing on each optical signal during the process of the first exchange matrix operation unit processing the optical signal, so that the second exchange matrix operation unit obtains the target optical signal based on the processed optical signal, thereby solving the technical problems in the prior art that the optical processing of the photonic computer system cannot realize the monitoring and error correction of the processing process, resulting in low reliability, and cannot make full use of the spatial domain and frequency domain, resulting in low processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 A schematic diagram of the structure of the first embodiment of the photon computing device capable of error correction in spatial and frequency domains in parallel in the present application;

[0038] Figure 2 A rectangular topological structure diagram of a switching matrix operation unit in a photonic computing device capable of error-correcting spatial-frequency domain parallelism in this application;

[0039] Figure 3 This is a triangular topological structure diagram of the switching matrix operation unit in the error-correctable spatial-frequency domain parallel photon computing device of the present application;

[0040] Figure 4 This is a schematic diagram of the structure of the MZI type unitary matrix operator unit in the error-correctable spatial-frequency domain parallel photon computing device of the present application;

[0041] Figure 5 A structural diagram of the second embodiment of the photon computing device capable of error correction in spatial domain and frequency domain parallelism provided in the present application;

[0042] Figure 6 A structural diagram of the third embodiment of the photon computing device capable of error correction in spatial domain and frequency domain parallelism provided in the present application;

[0043] Figure 7 This is a diagram showing the simulation results of the spectral response of the micro-ring structure in the error-correctable spatial-frequency domain parallel photonic computing device of the present application.

[0044] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0047] The main solution of the embodiment of the present application is: the first exchange matrix operation unit receives a plurality of multi-wavelength optical signals, and performs optical exchange processing and / or first matrix operation processing on each input multi-wavelength optical signal; during the processing, the amplitude, phase and frequency response control unit uses the periodic response of the micro-ring structure in the frequency domain to perform frequency array processing on each multi-wavelength optical signal, and when the processing is completed, the processing result of the intermediate wavelength optical signal is obtained by reverse calculation based on the optical signals of the first and last wavelengths; the second exchange matrix operation unit performs optical exchange processing and / or second matrix operation processing on the processed optical signal to obtain the target optical signal.

[0048] The present application provides a solution, which can use the periodic response of the amplitude, phase and frequency response control unit in the frequency domain to perform frequency domain array processing on each optical signal during the process of the first switching matrix operation unit processing the optical signal, so that the second switching matrix operation unit obtains the target optical signal based on the processed optical signal, thereby solving the technical problems in the prior art that the optical processing of the photonic computer system cannot monitor and correct the processing process, resulting in low reliability, and cannot fully utilize the spatial domain and frequency domain, resulting in low processing efficiency.

[0049] Based on this, the embodiment of the present application provides a photon computing device capable of error correction in spatial domain and frequency domain parallelism, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the error-correctable spatial-frequency domain parallel photonic computing device of the present application.

[0050] like Figure 1 As shown, the error-correctable spatial-frequency-domain parallel photonic computing device of this embodiment includes: a first switching matrix operation unit 10, an amplitude-phase-frequency response control unit 20 and a second switching matrix operation unit 30; the first switching matrix operation unit 10 and the second switching matrix operation unit 30 are connected via the amplitude-phase-frequency response control unit 20; the first switching matrix operation unit 10 and the second switching matrix operation unit 30 are both multi-channel switching matrix structures.

[0051] The first switching matrix operation unit 10 is used to receive a plurality of multi-wavelength optical signals and perform optical switching processing and / or first matrix operation processing on each input multi-wavelength optical signal.

[0052] It should be noted that the first switching matrix operation unit 10 and the second switching matrix operation unit 30 can both be N×N switching matrices, so that the error-correctable spatial-frequency domain parallel photon computing device proposed in this scheme can process N modulated optical carrier signals in parallel, and each optical signal can simultaneously contain wavelengths λ1 to λ N , all wavelengths are processed by matrix operations simultaneously through the N×N exchange matrix, thereby realizing spatial-frequency domain interleaving calculations.

[0053] The amplitude, phase and frequency response control unit 20 is used to perform frequency array processing on each of the multi-wavelength optical signals using the periodic response of the micro-ring structure 40 in the frequency domain during the processing, and to reversely obtain the processing result of the intermediate wavelength optical signal based on the optical signals of the first and last wavelengths when the processing is completed.

[0054] It should be noted that the micro-ring structure 40 can realize the simultaneous processing of each frequency comb wavelength in the same processing unit, and the reliability of the calculation processing is ensured by selecting 1 to N processed wavelength responses for calibration and inversion. Alternatively, by selecting 1 to N processed wavelength responses, the processed wavelength that meets the processing requirements is inverted from the known filter response of the micro-ring structure 40, and is selected to achieve parallel processing. Compared with the traditional optical computing method, this solution realizes the error-correctable characteristics of the optical processing process, and makes full use of the frequency domain and spatial domain to achieve multi-channel wavelength parallel processing.

[0055] It should be noted that in the traditional photon computing structure based on the MZI (Mach-Zehnder Interferometer) network, the phase shifter array or attenuator array structure is usually used as a tap between the two exchange matrix units, while the amplitude phase frequency response control unit 20 can be used as a tap in the computing unit structure proposed in this scheme, so that the signal of each channel can be adjusted, and the optical signal can be array processed by using the periodic response of the micro-ring in the frequency domain, and the optical signal can be detected as feedback of the processing process. Specifically, this scheme can introduce a feedback mechanism in the processing process, select 1-N processed wavelengths for calibration, realize feedback on the micro-ring configuration or feedback on the optical frequency comb, and thus realize reliable processing of optical signals.

[0056] It should be noted that the specific principle of fault tolerance of the optical processing process in this scheme is partly derived from the periodicity of the light source frequency comb and the micro-ring response in the frequency domain. By only selecting the optical signals of the first and last wavelengths on the spectrum for monitoring, the response of the intermediate wavelength optical signal can be deduced. The other part comes from the monitoring of the working state of the micro-ring by the low-speed PD of the tap structure (i.e., the low-speed PD set in the amplitude phase frequency response control unit 20) to ensure that the filter operates in the expected state.

[0057] The second switching matrix operation unit 30 is used to perform optical switching processing and / or second matrix operation processing on the processed optical signal to obtain a target optical signal.

[0058] It should be understood that the first matrix operation processing and the second matrix operation processing are respectively the calculation processing of the optical signal by the first switching matrix operation unit 10 and the second switching matrix operation unit 30. Accordingly, the target optical signal can be an optical signal obtained by processing the multiple optical signals of different wavelengths input to the first switching matrix operation unit 10.

[0059] In this embodiment, the first switching matrix operation unit 10 and the second switching matrix operation unit 30 are both composed of a plurality of MZI type unitary matrix operation subunits 101; each MZI type unitary matrix operation subunit 101 in the first switching matrix operation unit 10 and the second switching matrix operation unit 30 is connected by waveguides in a topological cascade manner.

[0060] It should be noted that the structure of the MZI unitary matrix operator unit in this embodiment can be integrated into a single chip, and the integrated process system includes but is not limited to SOI, SiN (including but not limited to rectangular waveguide, window waveguide, double-layer waveguide), PLC (silica), InP, GaAs and other systems, which are not limited in this embodiment.

[0061] Each of the MZI type unitary matrix operator units 101 is composed of a first input terminal in1, a second input terminal in2, a first output terminal out1, a second output terminal out2, a first coupler C1, a second coupler C2 and a first phase shifter P1; two optical waveguides are arranged between the first coupler C1 and the second coupler C2, and the first phase shifter P1 is arranged on one of the two optical waveguides.

[0062] It should be understood that the MZI unitary matrix operator unit 101 in this embodiment may also have a phase shifter in each arm, that is, a phase shifter is set on each of the two optical waveguides between the first coupler C1 and the second coupler C2, which also realizes the corresponding function by adjusting the phase difference of the optical signals in the two arms.

[0063] It should be noted that in this solution, the first exchange matrix operation unit 10 and the second exchange matrix operation unit 30 are composed of N(N-1) / 2 MZI type unitary matrix operation unit structures, which are realized by topological cascading of MZI type unitary matrix operation units. By performing continuous dimensionality reduction transformation on the two-dimensional subspace of the complete N-dimensional Hilbert space in a step-by-step iterative manner, an arbitrary unitary matrix decomposition UΣV is realized, where U is an N-order unitary matrix, Σ is a diagonal matrix with eigenvalues ​​on the diagonal, and the elements on the diagonal represent the sparse coefficients of the taps. Figure 2 and Figure 3 ,in, Figure 2 This is a rectangular topological structure diagram of the switching matrix operation unit in the photon computing device capable of error-correcting spatial-frequency domain parallelism in this application. Figure 3 The triangular topological structure diagram of the switching matrix operation unit in the photonic computing device capable of error correction in the spatial domain and frequency domain parallelism of the present application, the N×N switching matrix structure based on the topological cascade of the MZI type unitary matrix operation unit in the present solution includes a rectangular topology (such as Figure 2 ) and triangular topology (as Figure 3 Two general architectures are shown in Figure 1, where each grey box represents an MZI-type unitary matrix operation unit structure, and each white box represents an amplitude-phase-frequency response control unit structure. The two architectures have the same number of MZI-type unitary matrix operation units, and the rectangular topology has less impact on the unitary matrix fidelity due to cascade loss.

[0064] In practical applications, when the number of input channels is 4, the transmission matrix U(4) of the N×N switching matrix operation unit can be expressed as:

[0065]

[0066] Reference Figure 4 , Figure 4This is a schematic diagram of the structure of the MZI type unitary matrix operator unit in the photon computing device capable of error correction in the spatial domain and frequency domain in parallel in this application. Figure 4 As shown, the MZI unitary matrix operator unit 101 in this solution is composed of a phase shifter (i.e., the first phase shifter P1) and two couplers (i.e., the first coupler C1 and the second coupler C2), with two input terminals (i.e., the first input terminal in1 and the second input terminal in2) and two output terminals (i.e., the first output terminal out1 and the second output terminal out2), and the structure is bilaterally symmetrical. Among them, the first coupler C1 and the second coupler C2 can both be 50:50 couplers. In the 50:50 coupler, the input power is evenly distributed to the two output ports, while maintaining low insertion loss and return loss to ensure efficient transmission of the signal. In this embodiment, the 50:50 coupler can be implemented by a direct coupler (DirectionalCoupler, DC), a 2×2 multimode coupler (Multimode Interference, MMI) and other structures; the phase shifter can be implemented by an electrically adjustable phase shifter or a thermally adjustable phase shifter and other structures.

[0067] In a specific implementation, in this embodiment, the phase difference θ between the upper and lower arms is adjusted by adjusting the phase shifter to achieve control of the output optical signal. Its general transmission matrix can be expressed as:

[0068]

[0069] The 2×2 transfer matrix is ​​a complete second-order unitary matrix, represents the inherent phase shift brought by the 50:50 coupler, θ represents the phase difference between the upper and lower arms of the first phase shifter P1, and E out1 and E out2 They represent the optical power output from the first output terminal out1 and the second output terminal out2, E in1 and E in2 Respectively represent the optical power input to the first input terminal in1 and the second input terminal in2.

[0070] The MZI unitary matrix operator 101 is used to determine the current working state based on the phase difference between the upper and lower arms of the first phase shifter P1, and the current working state includes: a through state, a cross state and a coupling state.

[0071] In this embodiment, when the phase difference θ between the upper and lower arms of the first phase shifter P1 is ±π, the working state of the MZI unitary matrix operator unit 101 is a through state (Bar State, BS); when the phase difference θ between the upper and lower arms of the first phase shifter P1 is 0 and 2π, the working state of the MZI unitary matrix operator unit 101 is a cross state (Cross State, CS); when the phase difference θ between the upper and lower arms of the first phase shifter P1 is not the above two situations, the working state of the MZI unitary matrix operator unit 101 is a coupling state (Tunable Coupler, TC).

[0072] The MZI unitary matrix operator 101 is further configured to control the output of the target optical signal according to the current working state.

[0073] Specifically, the MZI unitary matrix operator unit 101 is used to control the optical signals input from the first input terminal in1 and the second input terminal in2 to be output from the first output terminal out1 and the second output terminal out2 respectively when the current working state is a through state; the MZI unitary matrix operator unit 101 is also used to control the optical signals input from the first input terminal in1 and the second input terminal in2 to be output from the second output terminal out2 and the first output terminal out1 respectively when the current working state is a cross state; the MZI unitary matrix operator unit 101 is also used to control the optical signals input from the first input terminal in1 and the second input terminal in2 to be output from the first output terminal out1 and the second output terminal out2 according to a preset splitting ratio when the current working state is a coupled state.

[0074] It should be noted that when the working state of the MZI unitary matrix operator 101 is the through state, the optical signal input from the first input terminal in1 can only be output from the first output terminal out1, and the optical signal input from the second input terminal in2 can only be output from the second output terminal out2; when the working state of the MZI unitary matrix operator 101 is the cross state, the optical signal input from the first input terminal in1 can only be output from the second output terminal out2, and the optical signal input from the second input terminal in2 can only be output from the first output terminal out1; when the MZ When the working state of the I-type unitary matrix operator unit 101 is a coupled state, the optical signal input from the first input terminal in1 and the second input terminal in2 can be output from the first output terminal out1 and the second output terminal out2 with a specific splitting ratio, and when θ=±π / 2, the splitting ratio of the MZI unitary matrix operator unit is 50:50, and the intensity of the optical signal output from the first output terminal out1 and the second output terminal out2 is 1 / 2 of the input optical signal. In the coupled state, regardless of the splitting ratio of the output optical signal, there will be an additional phase shift to form a phase shifter.

[0075] In this embodiment, a first switching matrix operation unit, an amplitude phase frequency response control unit, and a second switching matrix operation unit are disclosed; the first switching matrix operation unit is used to receive a plurality of multi-wavelength optical signals, and perform optical switching processing and / or first matrix operation processing on each input multi-wavelength optical signal; the amplitude phase frequency response control unit is used to perform frequency array processing on each multi-wavelength optical signal by using the periodic response of the micro-ring structure in the frequency domain during the processing, and to obtain the processing result of the intermediate wavelength optical signal by reverse deduction based on the optical signals of the first and last wavelengths when the processing is completed; the second switching matrix operation unit is used to perform optical switching processing and / or second matrix operation processing on the processed optical signal to obtain the target optical signal; because in this embodiment, during the process of the first switching matrix operation unit processing the optical signal, the periodic response of the amplitude phase frequency response control unit in the frequency domain is used to perform frequency domain array processing on each optical signal, so that the second switching matrix operation unit obtains the target optical signal based on the processed optical signal, thereby solving the technical problem that the optical processing of the photonic computer system in the prior art cannot make full use of the spatial domain and the frequency domain, resulting in low processing efficiency. At the same time, the working status of the amplitude, phase and frequency response control unit is monitored, and feedback is given by reading the PD current value, so that it is in the expected working state during the photon computing process, thereby solving the technical problem of low reliability caused by the inability to monitor and correct the processing process of the optical processing of the optical-computer system in the prior art.

[0076] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 5 , Figure 5 A structural block diagram is provided for the second embodiment of the error-correctable spatial-frequency domain parallel photonic computing device of the present application.

[0077] Based on the above-mentioned first embodiment of the photonic computing device capable of error correction in space-domain and frequency-domain parallelism, a second embodiment of the photonic computing device capable of error correction in space-domain and frequency-domain parallelism of the present invention is proposed.

[0078] like Figure 5 As shown, in this embodiment, the amplitude-phase-frequency response control unit 20 is composed of a first MZI type unitary matrix operator unit 201 , a second MZI type unitary matrix operator unit 202 and a third MZI type unitary matrix operator unit 203 .

[0079] The first MZI unitary matrix operator unit 201 is provided with a third coupler C3, a fourth coupler C4 and a second phase shifter P2, two optical waveguides are provided between the third coupler C3 and the fourth coupler C4, and the second phase shifter P2 is provided on one of the two optical waveguides.

[0080] The second MZI unitary matrix operator unit 202 is provided with a fifth coupler C5, a sixth coupler C6 and a third phase shifter P3, two optical waveguides are provided between the fifth coupler C5 and the sixth coupler C6, and the third phase shifter P3 is provided on one of the two optical waveguides.

[0081] The third MZI unitary matrix operator unit 203 is provided with a seventh coupler C7, an eighth coupler C8 and a fourth phase shifter P4, two optical waveguides are provided between the seventh coupler C7 and the eighth coupler C8, and the fourth phase shifter P4 is provided on one of the two optical waveguides.

[0082] The first MZI type unitary matrix operator unit 201, the second MZI type unitary matrix operator unit 202 and the third MZI type unitary matrix operator unit 203 are connected by an optical waveguide, a fifth phase shifter P5 is arranged between the third coupler C3 and the fifth coupler C5, a sixth phase shifter P6 is arranged between the fourth coupler C4 and the sixth coupler C6, a seventh phase shifter P7 is arranged between the fifth coupler C5 and the seventh coupler C7, and an eighth phase shifter P8 is arranged between the sixth coupler C6 and the eighth coupler C8.

[0083] It should be noted that if Figure 5As shown, in this embodiment, each amplitude-phase-frequency response control unit 20 is composed of 6 50:50 couplers (i.e., the third to eighth couplers) and 7 phase shifters (i.e., the second to eighth phase shifters) to form a dual-ring MRR (Micro-ring Resonator) structure, which can adjust the power of the optical signal coupled to the micro-ring structure by adjusting the second phase shifter P2.

[0084] It should be understood that, in this embodiment, the first MZI type unitary matrix operator unit 201, the second MZI type unitary matrix operator unit 202 and the third MZI type unitary matrix operator unit 203 are connected through the fifth to eighth phase shifters to jointly form an amplitude phase frequency response control unit 20.

[0085] Furthermore, the amplitude, phase, and frequency response control unit 20 is a reconfigurable micro-ring structure; the amplitude, phase, and frequency response control unit 20 is used to jointly adjust the power of the input optical signal through the second phase shifter P2, the third phase shifter P3, and the fourth phase shifter P4; the amplitude, phase, and frequency response control unit 20 is also used to adjust the group delay of the input optical signal when configured as an all-pass filter.

[0086] It should be noted that when the phase of the fourth phase shifter P4 is adjusted to π, the dual-ring MRR structure can be configured as an all-pass filter. At this time, the phase of the third phase shifter P3 can be adjusted to configure the group delay of the filter, thereby achieving alignment of the regulated optical signal.

[0087] Furthermore, the amplitude, phase, and frequency response control unit 20 is also used to adjust the phases of the third phase shifter P3 and the fourth phase shifter P4 to a target phase; wherein, when the third phase shifter P3 and the fourth phase shifter P4 are in the target phase, the second MZI type unitary matrix operator unit 202 is in a through state or a coupled state, the third MZI type unitary matrix operator unit 203 is in a cross state, and the amplitude, phase, and frequency response control unit 20 is configured as a target single-loop filter; the amplitude, phase, and frequency response control unit 20 is also used to perform a translation adjustment on the spectral response of the target single-loop filter based on the fifth phase shifter P5 and the sixth phase shifter P6.

[0088] It should be noted that when the phase of the third phase shifter P3 is adjusted to π, it can be configured as a single-ring MRR structure filter. At this time, by adjusting the phases of the fifth phase shifter P5, the sixth phase shifter P6, the seventh phase shifter P7 and the eighth phase shifter P8, the spectral response of the filter can be shifted and adjusted, thereby realizing the function of configuring a reconfigurable micro-ring filter.

[0089] Furthermore, a photodetector is provided in the third MZI type unitary matrix operator unit 203, and the photodetector is used to monitor the working state of the amplitude, phase, and frequency response control unit 20, and provide feedback by reading the current value, so that the amplitude, phase, and frequency response control unit 20 is in an expected working state during the processing of photon calculation, so as to realize the error-correctable characteristics of the optical calculation process.

[0090] It should be noted that in the present solution, the amplitude-phase-frequency response control unit 20 has only one signal input port and one signal output port, and has a photodetector (low-speed PD (Photo-Diode)) at the add and drop ends of the micro-ring structure 40 respectively for monitoring the optical power and realizing feedback on the working state and processing process of the micro-ring. For example, when the micro-ring is configured as an all-pass filter state, the PD current at the drop end should be kept at a minimum, that is, the optical signal is output from the signal output port.

[0091] In this embodiment, the first MZI unitary matrix operator unit 201 in the amplitude-phase-frequency response control unit 20 is provided with a third coupler C3, a fourth coupler C4 and a second phase shifter P2, two optical waveguides are provided between the third coupler C3 and the fourth coupler C4, and the second phase shifter P2 is provided on one of the two optical waveguides; the second MZI unitary matrix operator unit 202 is provided with a fifth coupler C5, a sixth coupler C6 and a third phase shifter P3, two optical waveguides are provided between the fifth coupler C5 and the sixth coupler C6. waveguide, the third phase shifter P3 is arranged on one of the two optical waveguides; the third MZI type unitary matrix operator unit 203 is provided with a seventh coupler C7, an eighth coupler C8 and a fourth phase shifter P4, two optical waveguides are arranged between the seventh coupler C7 and the eighth coupler C8, and the fourth phase shifter P4 is arranged on one of the two optical waveguides, so that the signal of each path can be adjusted, and the periodic response of the microring in the frequency domain is used to perform array processing on the optical signal. At the same time, the optical signal can also be detected as feedback of the processing process, thereby ensuring the reliability of the optical processing.

[0092] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 6 , Figure 6 A structural block diagram is provided for Example 3 of the error-correctable spatial-frequency domain parallel photonic computing device of the present application.

[0093] Based on the above-mentioned first embodiment and / or second embodiment of the error-correctable spatial-frequency-parallel photonic computing device, a third embodiment of the error-correctable spatial-frequency-parallel photonic computing device of the present invention is proposed.

[0094] like Figure 6 As shown, in this embodiment, the micro-ring structure 40 is composed of a fourth MZI type unitary matrix operator unit 401 and a fifth MZI type unitary matrix operator unit 402 .

[0095] The fourth MZI unitary matrix operator unit 401 is provided with a ninth coupler C9, a tenth coupler C10 and a ninth phase shifter P9, two optical waveguides are provided between the ninth coupler C9 and the tenth coupler C10, and the ninth phase shifter P9 is provided on one of the two optical waveguides.

[0096] The fifth MZI unitary matrix operator unit 402 is provided with an eleventh coupler C11, a twelfth coupler C12 and a tenth phase shifter P10, two optical waveguides are provided between the eleventh coupler C11 and the twelfth coupler C12, and the tenth phase shifter P10 is provided on one of the two optical waveguides.

[0097] The micro-ring structure 40 is connected by the fourth MZI type unitary matrix operator unit 401 and the fifth MZI type unitary matrix operator unit 402 through an optical waveguide, an eleventh phase shifter P11 is arranged between the ninth coupler C9 and the eleventh coupler C11, and a twelfth phase shifter P12 is arranged between the tenth coupler C10 and the twelfth coupler C12.

[0098] In the specific implementation, Figure 6 As shown, in this embodiment, the micro-ring structure 40 is composed of four 50:50 couplers (i.e., the ninth to twelfth couplers) and four phase shifters (i.e., the ninth to twelfth phase shifters). By adjusting the ninth phase shifter P9, the optical power coupled into the micro-ring structure can be adjusted, and by adjusting the tenth phase shifter P10, the output optical signal power can be adjusted. At the same time, in this embodiment, the add and drop ends of the micro-ring structure 40 are respectively provided with a photodetector (i.e., a low-speed PD) to monitor the optical power and realize feedback on the working state of the micro-ring.

[0099] Furthermore, the micro-ring structure 40 is used to adjust the spectrum response through the eleventh phase shifter P11 and the twelfth phase shifter P12.

[0100] In this embodiment, refer to Figure 7 , Figure 7 The simulation results of the spectrum response of the micro-ring structure in the error-correctable spatial-frequency domain parallel photon computing device of this application are shown in the figure. Figure 7 As shown, in this embodiment, by adjusting the tenth phase shifter P10, the micro-ring can be adjusted to act as a resonant cavity or an all-pass filter; by adjusting the eleventh phase shifter 11, the response curve can be adjusted to shift left and right in the spectrum.

[0101] It should be noted that in this solution, after the frequency comb optical signal is input into the micro-ring structure 40 from the input end, the wavelength interval between the comb teeth of the frequency comb and the micro-ring free spectrum range FSR may be consistent or inconsistent, and each frequency comb wavelength is processed simultaneously in the same processing unit based on the sampling of the filter response curve of the micro-ring structure. This solution selects 1 to N processed wavelength responses for calibration to achieve feedback on the micro-ring configuration or the optical frequency comb, thereby ensuring the reliability of the processing process, or selects 1 to N processed wavelength responses to infer the processed wavelength that meets the processing requirements from the known filter response of the micro-ring structure, and selects it to achieve parallel processing.

[0102] Furthermore, in the present embodiment, the materials of the first to fifth MZI type unitary matrix operator units 402 include but are not limited to silicon on insulator (SOI), silicon nitride (SiN), lithium niobate (LiNb2O3), and the like.

[0103] In this embodiment, the fourth MZI unitary matrix operator unit 401 in the micro-ring structure 40 is provided with a ninth coupler C9, a tenth coupler C10 and a ninth phase shifter P9, two optical waveguides are provided between the ninth coupler C9 and the tenth coupler C10, and the ninth phase shifter P9 is provided on one of the two optical waveguides; the fifth MZI unitary matrix operator unit 402 is provided with an eleventh coupler C11, a twelfth coupler C12 and a tenth phase shifter P10, and the eleventh coupler C13 is provided with a tenth phase shifter P14. Two optical waveguides are arranged between the coupler C11 and the twelfth coupler C12, and the tenth phase shifter P10 is arranged on one of the two optical waveguides; the eleventh phase shifter P11 is arranged in the optical waveguide between the ninth coupler C9 and the eleventh coupler C11, and the twelfth phase shifter P12 is arranged in the optical waveguide between the tenth coupler C10 and the twelfth coupler C12, so that the processed wavelength that meets the processing requirements can be inferred through the micro-ring frequency domain response, thereby further improving the reliability of optical processing.

Claims

1. A photonic computing device capable of error correction in spatial domain and frequency domain parallelism, characterized in that: The device comprises: a first switching matrix operation unit, an amplitude-phase-frequency response control unit, and a second switching matrix operation unit; the first switching matrix operation unit and the second switching matrix operation unit are connected via the amplitude-phase-frequency response control unit; the first switching matrix operation unit and the second switching matrix operation unit are both multi-channel switching matrix structures; The first switching matrix operation unit is used to receive a plurality of multi-wavelength optical signals and perform optical switching processing and / or first matrix operation processing on each input multi-wavelength optical signal; The amplitude phase frequency response control unit is used to perform frequency array processing on each of the multi-wavelength optical signals by utilizing the periodic response of the micro-ring structure in the frequency domain during the processing, and to reversely obtain the processing result of the intermediate wavelength optical signal based on the optical signals of the first and last wavelengths when the processing is completed; The second switching matrix operation unit is used to perform optical switching processing and / or second matrix operation processing on the processed optical signal to obtain a target optical signal; The first exchange matrix operation unit and the second exchange matrix operation unit are both composed of a plurality of MZI type unitary matrix operation subunits; the MZI type unitary matrix operation subunits in the first exchange matrix operation unit and the second exchange matrix operation unit are connected by waveguides in a topological cascade manner; Each of the MZI type unitary matrix operator units is composed of a first input end, a second input end, a first output end, a second output end, a first coupler, a second coupler and a first phase shifter; two optical waveguides are arranged between the first coupler and the second coupler, and the first phase shifter is arranged on one of the two optical waveguides; The MZI unitary matrix operator unit is used to determine the current working state based on the phase difference between the upper and lower arms of the first phase shifter, and the current working state includes: a through state, a cross state and a coupling state; The MZI type unitary matrix operator unit is further used to control the output of the target optical signal according to the current working state; The amplitude-phase-frequency response control unit is composed of a first MZI-type unitary matrix operator unit, a second MZI-type unitary matrix operator unit and a third MZI-type unitary matrix operator unit; The first MZI type unitary matrix operator unit is provided with a third coupler, a fourth coupler and a second phase shifter, two optical waveguides are provided between the third coupler and the fourth coupler, and the second phase shifter is provided on one of the two optical waveguides; The second MZI type unitary matrix operator unit is provided with a fifth coupler, a sixth coupler and a third phase shifter, two optical waveguides are provided between the fifth coupler and the sixth coupler, and the third phase shifter is provided on one of the two optical waveguides; The third MZI type unitary matrix operator unit is provided with a seventh coupler, an eighth coupler and a fourth phase shifter, two optical waveguides are provided between the seventh coupler and the eighth coupler, and the fourth phase shifter is provided on one of the two optical waveguides; The first MZI type unitary matrix operator unit, the second MZI type unitary matrix operator unit and the third MZI type unitary matrix operator unit are connected by an optical waveguide, a fifth phase shifter is arranged between the third coupler and the fifth coupler, a sixth phase shifter is arranged between the fourth coupler and the sixth coupler, a seventh phase shifter is arranged between the fifth coupler and the seventh coupler, and an eighth phase shifter is arranged between the sixth coupler and the eighth coupler.

2. The device according to claim 1, characterized in that The MZI type unitary matrix operator unit is used to control the optical signals input from the first input end and the second input end to be output from the first output end and the second output end respectively when the current working state is a through state; The MZI type unitary matrix operator unit is further used to control the optical signals input from the first input end and the second input end to be output from the second output end and the first output end respectively when the current working state is a cross state; The MZI unitary matrix operator unit is further used to control the optical signals input from the first input end and the second input end to be output from the first output end and the second output end according to a preset splitting ratio when the current working state is a coupled state.

3. The device according to claim 1, characterized in that The amplitude, phase and frequency response control unit is a reconfigurable micro-ring structure; the amplitude, phase and frequency response control unit is used to jointly adjust the power of the input optical signal through the second phase shifter, the third phase shifter and the fourth phase shifter; The amplitude, phase and frequency response control unit is further used to adjust the group delay of the input optical signal when configured as an all-pass filter.

4. The device according to claim 1, characterized in that The amplitude phase frequency response control unit is further used to adjust the phases of the third phase shifter and the fourth phase shifter to a target phase; wherein, when the third phase shifter and the fourth phase shifter are in the target phase, the second MZI type unitary matrix operator unit is in a through state or a coupled state, the third MZI type unitary matrix operator unit is in a cross state, and the amplitude phase frequency response control unit is configured as a target single-loop filter; The amplitude, phase and frequency response control unit is further used to perform translation adjustment on the spectrum response of the target single-loop filter based on the fifth phase shifter and the sixth phase shifter.

5. The device according to claim 1, characterized in that A photodetector is provided in the third MZI type unitary matrix operator unit, and the photodetector is used to monitor the working state of the amplitude, phase, and frequency response control unit, and provide feedback by reading the current value, so that the amplitude, phase, and frequency response control unit is in the expected working state during the processing of photon calculation, so as to realize the error-correctable characteristics of the optical calculation process.

6. The device according to any one of claims 1 to 5, characterized in that The micro-ring structure is composed of a fourth MZI type unitary matrix operator unit and a fifth MZI type unitary matrix operator unit; The fourth MZI type unitary matrix operator unit is provided with a ninth coupler, a tenth coupler and a ninth phase shifter, two optical waveguides are provided between the ninth coupler and the tenth coupler, and the ninth phase shifter is provided on one of the two optical waveguides; The fifth MZI unitary matrix operator unit is provided with an eleventh coupler, a twelfth coupler and a tenth phase shifter, two optical waveguides are provided between the eleventh coupler and the twelfth coupler, and the tenth phase shifter is provided on one of the two optical waveguides; The micro-ring structure is connected by the fourth MZI type unitary matrix operator unit and the fifth MZI type unitary matrix operator unit through an optical waveguide, an eleventh phase shifter is arranged between the ninth coupler and the eleventh coupler, and a twelfth phase shifter is arranged between the tenth coupler and the twelfth coupler.

7. The device according to claim 6, characterized in that The micro-ring structure is used to adjust the spectrum response through the eleventh phase shifter and the twelfth phase shifter.

8. The device according to claim 6, characterized in that The materials of the first to fifth MZI type unitary matrix operator units include: silicon on insulator, silicon nitride and lithium niobate.

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