CN116266771A - Convolution operation device and convolution operation method based on multimode interference - Google Patents
Convolution operation device and convolution operation method based on multimode interference Download PDFInfo
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Abstract
The present disclosure provides a convolution operation device based on multimode interference, comprising: the laser generation module is used for generating first laser; the data input module is used for modulating the data to be processed onto the first laser; the delay module is used for delaying and splitting the modulated first laser to obtain N beams of second laser; the multimode interference coupler is used for simultaneously carrying out multimode interference on N beams of second lasers according to a preset convolution matrix and outputting M groups of optical signals; the detector array comprises M photoelectric detectors, and the M photoelectric detectors are used for respectively receiving M groups of optical signals and detecting the intensity of the M groups of optical signals to obtain convolution operation results; wherein M and N are positive integers. The present disclosure also provides a convolution operation method based on multimode interference.
Description
Technical Field
The disclosure relates to the fields of big data technology and microwave photonics, in particular to a convolution operation device based on multimode interference and a convolution operation method thereof.
Background
Convolution operation is used as a big data operation method which can be widely applied to the fields of signal processing, physics, image processing, artificial intelligence and the like, and the efficiency of data processing needs to be improved by means of a high-performance computer.
With the development of 5G technology, autopilot technology, and high-speed network systems, the amount of data that needs to be processed by convolution operations grows exponentially. Accordingly, traditional von neumann architecture-based computers are increasingly facing challenges in latency, power consumption, and processing rate.
Disclosure of Invention
In view of this, in order to overcome at least one aspect of the above-described problems, the present disclosure provides a convolution operation device based on multimode interference, including: the laser generation module is used for generating first laser; the data input module is used for modulating data to be processed onto the first laser; the delay module is used for delaying and splitting the modulated first laser to obtain N beams of second laser; the multimode interference coupler is used for simultaneously carrying out multimode interference on the N beams of second lasers according to a preset convolution matrix and outputting M groups of optical signals; the detector array comprises M photoelectric detectors, wherein the M photoelectric detectors are used for respectively receiving the M groups of optical signals and detecting the intensity of the M groups of optical signals to obtain convolution operation results; wherein M and N are positive integers.
According to an embodiment of the present disclosure, the multimode interference coupler includes N input ports and M output ports; the multimode interference coupler is used for respectively receiving the N beams of second laser through the N input ports, and respectively splitting the N beams of second laser to the M output ports according to N groups of preset splitting ratios to obtain M groups of optical signals; the N groups of preset beam splitting ratios are in one-to-one correspondence with the N beams of second laser.
According to an embodiment of the present disclosure, the preset convolution matrix includes M convolution kernels; the multimode interference coupler is used for adjusting the intensity of the N beams of second laser according to the M convolution kernels respectively to obtain M groups of optical signals; wherein the M convolution kernels are in one-to-one correspondence with the M groups of optical signals.
According to an embodiment of the present disclosure, the multimode interference coupler includes N input waveguides, M output waveguides, and a multimode interference zone; the N input waveguides and the M output waveguides are respectively arranged at two sides of the multimode interference area at preset intervals.
According to an embodiment of the present disclosure, the multimode interference zone includes a plurality of multimode interference units and a plurality of tuning controls, where the plurality of tuning controls are respectively used to adjust refractive indexes of one multimode interference unit of the plurality of multimode interference units.
According to an embodiment of the present disclosure, the multimode interference coupler further includes N polarization controllers; the N polarization controllers are used for respectively controlling the polarization states of the N beams of second laser light.
According to an embodiment of the present disclosure, in case the at least one multimode interference coupler comprises a plurality of multimode interference couplers, the plurality of multimode interference couplers are connected in parallel.
According to an embodiment of the present disclosure, the data input module includes: the random waveform generator is used for converting the data to be processed into signals to be processed; and the electro-optical modulator is used for receiving the signal to be processed and the first laser and modulating the signal to be processed onto the first laser.
According to the embodiment of the disclosure, the delay module comprises a beam splitter and at least N-1 optical delay lines, the data to be processed comprises N bits of data which are continuously input, and the duration of each bit of data is one input period; the beam splitter is used for dividing the modulated first laser into N beams to obtain N laser components; the at least N-1 optical delay lines are used for respectively delaying the N laser components to obtain N beams of second laser; wherein the N-1 second laser of the N second lasers is sequentially delayed by one input period so that the N bits of data are simultaneously input to the multimode interference coupler.
The disclosure also provides a convolution operation method of multimode interference, based on the convolution operation device of multimode interference described in any one of the above, the method includes: generating first laser by a laser generating module; modulating data to be processed onto the first laser through a data input module; delaying and splitting the modulated first laser by a delay module to obtain N beams of second laser; simultaneously carrying out multimode interference on the N beams of second lasers according to a preset convolution matrix through at least one multimode interference coupler, and outputting M groups of optical signals; the detector array comprises M photoelectric detectors, the M photoelectric detectors respectively receive the M groups of optical signals and detect the intensities of the N groups of optical signals to obtain convolution operation results; wherein M and N are positive integers.
Compared with the prior art, the method has the following beneficial effects:
1. by utilizing the advantages of light such as large bandwidth, high speed, low delay and the like, the transmission time of the light and the wavelength of the light are designed, and high-efficiency big data processing is carried out through light transmission.
2. The parallel convolution operation of a plurality of convolution kernels is realized by using a plurality of laser components with different wavelengths, so that the input rate of data is improved, and the data processing process is faster.
3. The convolution kernel is adjusted in real time by the special design of structural parameters, regional fine regulation and control of refractive indexes, polarization control of input light and other technologies in the multimode interference coupler, so that the convolution operation system has complete reconfigurability and expansibility.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a multi-mode interference-based convolution operation apparatus of an embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic diagram of laser delay according to an embodiment of the disclosure;
FIG. 3 schematically illustrates a structural schematic of a multimode interference coupler of an embodiment of the present disclosure;
FIG. 4 schematically illustrates a schematic structure of a multimode interference coupler of another embodiment of the disclosure;
FIG. 5 schematically illustrates a schematic structure of a multimode interference coupler of another embodiment of the disclosure;
FIG. 6 schematically illustrates a schematic diagram of a multi-mode interference based convolution operation device according to another embodiment of the present disclosure; and
fig. 7 schematically illustrates a flowchart of a convolution operation method of multi-mode interferometry according to an embodiment of the present disclosure.
Description of the reference numerals
1. Laser generating module
2. Data input module
3. Delay module
4. Multimode interference coupler
41. Input waveguide
42. Output waveguide
43. Multimode interference region
44. Polarization controller
5. Detector array
51. Photoelectric detector
6. Optical coupler
Detailed Description
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for use in the embodiments or prior art description will be briefly described below, it being apparent that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. Other figures can be obtained from these figures without inventive effort for the person skilled in the art. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
Fig. 1 schematically illustrates a schematic diagram of a multi-mode interference-based convolution operation apparatus according to an embodiment of the present disclosure. As shown in fig. 1, the present disclosure provides a convolution operation device 100 based on multimode interference, including: a laser generating module 1, a data input module 2, a delay module 3, at least one multimode interference coupler 4 and a detector array 5.
The laser generation module 1, the data input module 2, the delay module 3, the at least one multimode interference coupler 4 and the detector array 5 are sequentially connected through optical fiber jumpers.
The convolution operation device 100 based on multimode interference further comprises an optical amplifier, which may be located at any position in the optical link, for amplifying the power of the laser light in the optical link.
The laser generating module 1 is used for generating first laser.
To achieve convolution operations on the plurality of convolution kernels, the first laser may include N laser components, N being a positive integer.
Illustratively, the laser generating module 1 comprises N lasers and a beam combiner. The N lasers respectively generate N lasers with different wavelengths, and the beam combiner combines the N lasers with different wavelengths into first lasers. Beam combiners include, but are not limited to, optical couplers, wavelength division multiplexers, dense wavelength division multiplexers, and arrayed waveguide gratings.
The laser generating module 1 may be a multi-wavelength laser, for example. The multi-wavelength laser generates a laser beam that includes N laser components having different wavelengths.
And the data input module 2 is used for modulating the data to be processed onto the first laser.
The data input module 2 comprises an arbitrary waveform generator and an electro-optical modulator. The arbitrary waveform generator and the electro-optic modulator are connected by a cable.
The data input module 2 may further include an electric amplifier, which may be located between the arbitrary waveform generator and the electro-optical modulator, and the electric amplifier is connected to the arbitrary waveform generator and the electro-optical modulator through two ends of a cable, and is configured to receive and amplify power of the signal to be processed, and send the amplified signal to be processed to the electro-optical modulator.
And the arbitrary waveform generator is used for converting the data to be processed into signals to be processed. The data to be processed includes, but is not limited to, images, audio, video, and text. The arbitrary waveform generator converts an image, audio, text, and the like to be processed into an electrical signal to be processed.
The data to be processed may be converted into the signal to be processed by a Programmable Pulse Generator (PPG), or may be converted into the signal to be processed by a combination of a digital-to-analog converter and a unit of logic operation such as a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a Graphics Processor (GPU), an Application Specific Integrated Circuit (ASIC), etc.
And the electro-optical modulator is used for receiving the signal to be processed and the first laser and modulating the signal to be processed onto the first laser.
The electric signal to be processed is used as a modulation signal, and the electric light modulator is used for modulating the signal to be processed onto the first laser. The data to be processed is understandably loaded onto the intensity of the first laser light by means of an electro-optical modulator.
The intensity of the modulated first laser light was changed. The intensity of the N laser components included in the modulated first laser is changed, but the intensity of each laser component is changed in equal proportion. The relative intensity relationship between the modulated laser components is consistent with the relative intensity relationship between the laser components before modulation.
And the delay module 3 is used for delaying and splitting the modulated first laser to obtain N beams of second laser.
When convolution operation is performed, N bits of data to be convolved need to be input to the multimode interference coupler 4 at the same time, and the data to be processed is modulated onto the first laser in a serial manner, so that N laser components of the modulated first laser need to be delayed to different degrees, so that N bits of data to be convolved can be input to the multimode interference coupler 4 at the same time.
The delay module 3 comprises a beam splitter and at least N-1 optical delay lines. The data to be processed comprises N bits of data which are continuously input, and the duration of each bit of data is one input period.
The beam splitter is used for dividing the modulated first laser into N beams to obtain N laser components. The beam splitter splits the modulated first laser beam into N beams according to wavelengths, each wavelength being split into one beam, each beam forming a laser component. Beam splitters include, but are not limited to, wavelength division demultiplexers, dense wavelength division demultiplexers, arrayed waveguide gratings, and waveform shapers.
And delaying N-1 laser components in the N laser components by at least N-1 optical delay lines respectively to obtain N beams of second laser. Wherein, N-1 beams of the N beams of the second laser light are sequentially delayed by one input period, so that N bits of data are simultaneously input into the multimode interference coupler 4 respectively.
Fig. 2 schematically illustrates a schematic diagram of laser delay according to an embodiment of the present disclosure.
As shown in fig. 2 (a), the Laser generating module 1 generates a first Laser including 4 Laser beams 1 ～Laser 4 . The data to be processed includes data X 1 ～X 4 The input frequency of the data to be processed is f. After passing through the data input module 2, the Laser 1 ～Laser 4 All carry data X to be processed 1 ～X 4 . Since the input frequency of the data to be processed is f, the input timings between each data to be processed differ by one input period t=1/f.
If 4 lasers are simultaneously input into the multimode interference coupler 4, the multimode interference coupler 4 can only simultaneously receive the data X to be processed in the first data input period 1 Only the data X to be processed can be received simultaneously in the second data input period 2 。
As shown in fig. 2 (B), the delay module 3 delays the 4 laser beams respectively, so that the multimode interference coupler 4 can receive the data X to be processed at a time 1 ～X 4 . The time delay operation includes the step of feeding the Laser 1 Delay 3 input cycles, will be excitedOptical Laser 2 Delay 2 input periods, laser 3 Delay 1 input period for Laser 4 Without delay.
And the at least one multimode interference coupler 4 is used for simultaneously carrying out multimode interference on the N beams of second lasers according to a preset convolution matrix and outputting M groups of optical signals.
The multimode interference coupler 4 includes N input ports and M output ports. The multimode interference coupler 4 receives the N beams of second laser light through the N input ports, splits the N beams of second laser light to the M output ports according to the N groups of preset splitting ratios, and outputs M groups of optical signals through the M output ports.
The N groups of preset beam splitting ratios are in one-to-one correspondence with the N beams of second lasers. Each second laser beam is split to M output ends according to the corresponding splitting ratio, and each output end outputs laser beams split by N second laser beams.
For example, the multimode interference coupler 4 includes 4 input ports and 5 output ports, and the multimode interference coupler 4 receives 4 Laser beams 'through the 4 input ports, respectively' 1 ～Laser’ 4 . According to 4 groups of preset beam splitting ratios S 11 ～S 15 、S 21 ～S 25 、S 31 ～S 35 、S 41 ～S 45 For 4-beam Laser' 1 ～Laser’ 4 Splitting the beam.
According to a preset splitting ratio S 11 ～S 15 Laser' 1 Splitting into 5 output ports according to a preset splitting ratio S 21 ～5 25 Laser' 2 Splitting into 5 output ports according to a preset splitting ratio S 31 ～S 35 Laser' 3 Splitting into 5 output ports according to a preset splitting ratio S 41 ～S 45 Laser' 4 Split into 5 output ports. The 5 output ports output 5 groups of optical signals, and the optical signal output by the first output port comprises Laser' 1 ～Laser’ 4 Respectively according to a preset beam splitting ratio S 11 、S 21 、S 31 And S is 41 Splitting the laser beam to a first output port, a second output portThe optical signal comprises Laser' 1 ～Laser’ 4 Respectively according to a preset beam splitting ratio S 12 、S 22 、S 32 And S is 42 Splitting the Laser beam to a second output port, wherein the optical signal output by the third output port comprises a Laser' 1 ～Laser’ 4 Respectively according to a preset beam splitting ratio S 13 、S 23 、S 33 And S is 43 Splitting the Laser beam to a third output port, wherein the optical signal output by the fourth output port comprises Laser' 1 ～Laser’ 4 Respectively according to a preset beam splitting ratio S 14 、S 24 、S 34 And S is 44 Splitting the Laser light into a fourth output port, and outputting an optical signal including a Laser 'from a fifth output port' 1 ～Laser’ 4 Respectively according to a preset beam splitting ratio S 15 、S 25 、S 35 And S is 45 Splitting the laser light to a fifth output port.
The N-beam laser beam splitting is carried out according to a preset splitting ratio, namely the data to be processed loaded on the laser beam is subjected to convolution operation according to a preset convolution matrix. The preset convolution matrix includes M convolution kernels. The multimode interference coupler adjusts the intensity of N beams of second laser according to one of the M convolution kernels respectively to obtain M groups of optical signals. Wherein, M convolution kernels are in one-to-one correspondence with M groups of optical signals.
Illustratively, the predetermined convolution matrix is
Convolution kernels are { (K) 11 ... K 1N )，...，(K M1 ... K MN ) Data to be processed including X 1 ～X N The output convolution operation result is Y 1 ～Y M 。
The convolution operation process can be expressed as formula (1):
convolution result y1=x 1 K 11 +X 2 K 12 +…+X N K 1N 。
For example, the preset convolution matrix includes 5 convolution kernels C 1 ～C 5 . The multimode interference coupler 4 is based on 5 convolution kernels C, respectively 1 ～C 5 Adjusting 4-beam Laser' 1 ～Laser’ 4 To obtain 5 groups of optical signals.
According to convolution kernel C 1 Adjust 4 Laser lasers' 1 ～Laser’ 4 For the intensity of Laser' 1 ～Laser’ 4 Carrying out convolution operation on the loaded data to be processed, and outputting a first group of optical signals Laser' 1 . Similarly, output optical signal Laser' 2 ～Laser” 5 . Wherein, 5 convolution kernels are in one-to-one correspondence with 5 groups of optical signals, and each convolution kernel comprises 4 elements.
It should be noted that each convolution kernel includes the same number of elements as the number of input ports of the multimode interference coupler. Convolution kernels come in a variety of forms. In the above embodiment, the convolution kernel is represented in the form of a one-dimensional transverse vector, and the convolution kernel may also be represented in the form of a multidimensional matrix. However, the convolution operation process can be expressed by the above formula (1) no matter what form the convolution kernel is expressed. In the case where the convolution kernel is a multi-dimensional matrix, the multi-dimensional matrix may be converted into a one-dimensional transverse vector.
Fig. 3 schematically illustrates a structural schematic of a multimode interference coupler of an embodiment of the disclosure.
As shown in fig. 3, the multimode interference coupler 4 includes N input waveguides 41, M output waveguides 42, and a multimode interference region 43.N input waveguides 41 and M output waveguides 42 are respectively installed at both sides of the multimode interference zone 43 at preset intervals. Changing the mounting positions of the input waveguide 41 and the output waveguide 42 can realize adjustment of a preset convolution matrix. The length L, width W and height H of the multimode interference zone 43 can be designed to achieve adjustment of the preset convolution matrix.
Fig. 4 schematically illustrates a schematic structure of a multimode interference coupler according to another embodiment of the disclosure.
As shown in fig. 4, the multimode interference zone 43 includes a plurality of multimode interference units and a plurality of tuning members for adjusting refractive indexes of the plurality of multimode interference units, respectively. The multimode interference units and the regulating and controlling pieces are respectively in one-to-one correspondence.
In embodiments of the present disclosure, methods of modulating a multimode interference unit include a variety of. Electrodes can be manufactured in each multimode interference unit, different voltages are applied to the electrodes, and the refractive index is adjusted in a carrier injection mode; the phase change material or ferroelectric material can be used for manufacturing the multimode interference areas to realize independent regulation and control of refractive index; the refractive index of each multimode interference unit can be independently adjusted by independently designing the thickness, doping concentration and the like of each multimode interference unit.
The refractive index of the multimode interference unit is independently and finely regulated, so that the fine adjustment of the convolution matrix can be realized.
Fig. 5 schematically illustrates a schematic structure of a multimode interference coupler according to another embodiment of the disclosure.
As shown in fig. 5, the multimode interference coupler 4 further includes N polarization controllers 44 on the basis of N input waveguides 41, M output waveguides 42, and a multimode interference zone 43.
The optical signal is input to the polarization controller 44 before being input to the input waveguide 41. The polarization controllers 44 control the polarization states of the laser light, respectively, to achieve adjustment of the convolution matrix.
The detector array 5 converts the received optical signals into electrical signals, thereby converting the convolution results into the electrical domain.
The detector array 5 includes M photodetectors 51, and the M photodetectors 51 respectively receive M sets of optical signals and detect intensities of the M sets of optical signals, so as to obtain a convolution operation result.
The present disclosure provides yet another embodiment, the delay module 3 may also be a dispersive medium and a beam splitter. In the case where the delay module 3 is a dispersive medium, the laser generating module 1 generates laser light having a comb spectrum, which includes N laser light components. The wavelength of each laser component is different, and the wavelength interval between any two adjacent laser components is equal.
For example, the Laser generating module 1 generates a Laser including 4 Laser components 1 ～Laser 4 4 Laser component lasers 1 ～Laser 4 Respectively of lambda 1 、λ 2 、λ 3 And lambda (lambda) 4 . Wherein lambda is 1 、λ 2 、λ 3 And lambda (lambda) 4 The wavelength interval between two laser components adjacent to any wavelength is the same. Understandably, lambda 1 、λ 2 、λ 3 And lambda (lambda) 4 The wavelength relationship between them satisfies Δλ=λ 1 -λ 2 ＝λ 2 -λ 3 ＝λ 3 -λ 4 。
The laser generating module 1 can be a multi-wavelength laser, N lasers, an active mode locking laser, an optical frequency comb, a high-speed direct-tuning laser and a combination of the laser and an electro-optical modulator.
The dispersion medium includes, but is not limited to, at least one of a dispersion compensating fiber, a chirped fiber grating, a common single mode fiber, and a multimode fiber. The dispersive medium delays the N laser components to varying degrees.
The present disclosure provides an exemplary method of achieving a delay of one data input period between any two laser components that are wavelength-adjacent. The present disclosure is not limited to a particular laser delay method.
For example, it may be provided that the laser component and the dispersive medium satisfy:
wherein Deltalambda is the wavelength interval between any two laser components with adjacent wavelengths, f k For the input frequency of the data to be processed,
the dispersion coefficient for the dispersive medium and L for the length of the dispersive medium. It is understood that the amount of delay between any two laser components that are wavelength-adjacent is 1/f.
In the case that the delay module 3 is a beam splitter and N-1 optical delay lines, it is necessary to split the laser beam into N beams according to the wavelength, delay the N beams by the optical delay lines, and input the delayed N beams to the multimode interference coupler 4. In the case where the delay module 3 is a dispersive medium and a beam splitter, group velocity dispersion is directly performed on the modulated laser light, the dispersed laser light is split into N beams, and the N beams of laser light are input to the multimode interference coupler 4.
The present disclosure also provides another embodiment, in which the laser generating module 1 may be a single wavelength laser that generates a single wavelength laser. The delay module 3 is a plurality of optical delay lines.
Before the optical delay line delays the laser, the optical coupler is needed to divide the modulated single-wavelength laser power into N beams, and the optical delay line delays the N beams respectively.
Fig. 6 schematically illustrates a schematic diagram of a multi-mode interference-based convolution operation apparatus according to another embodiment of the present disclosure.
As shown in fig. 6, the convolution operation device 100 based on multimode interference includes a laser generating module 1, a data input module 2, a delay module 3, N optical couplers 6, R multimode interference couplers 4, R detector arrays 5, and R multimode interference couplers 4 connected in parallel.
The laser generating module 1, the data input module 2, the delay module 3 and the detector array 5 refer to the previous embodiment of the convolution operation device based on multimode interference, and are not described herein again.
The delay module 3 delays the N laser components to obtain N beams of second laser, and the N optical couplers 6 divide the N beams of second laser into R beams respectively. R laser beams which are subjected to power division through each optical coupler 6 are respectively input into R multimode interference couplers 4, so that parallel convolution calculation of a plurality of convolution kernels is realized.
The present disclosure provides a detailed convolution operation method, which is suitable for the convolution operation device, and fig. 7 schematically shows a flowchart of the convolution operation method according to an embodiment of the present disclosure.
As shown in fig. 7, the convolution operation method at least includes the following steps:
s1, generating first laser through a laser generating module.
S2, modulating the data to be processed onto the first laser through the data input module.
And S3, delaying and splitting the modulated first laser by a delay module to obtain N beams of second laser.
S4, carrying out multimode interference on N beams of second lasers simultaneously through at least one multimode interference coupler according to a preset convolution matrix, and outputting M groups of optical signals, wherein M is a positive integer.
S5, the detector array comprises M photoelectric detectors, the M photoelectric detectors respectively receive M groups of optical signals, and the intensities of the M groups of optical signals are detected to obtain convolution operation results.
It should be noted that, in the embodiment of the present disclosure, the convolution operation method of multi-mode interference corresponds to the convolution operation device portion of multi-mode interference in the embodiment of the present disclosure, and the description of the convolution operation method of multi-mode interference specifically refers to the convolution operation device portion of multi-mode interference, which is not described herein again.
It should also be noted that, in the embodiments of the present disclosure, the features of the embodiments and the embodiments of the present disclosure may be combined with each other to obtain new embodiments without conflict.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of the present disclosure and not for limiting, and although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present disclosure without departing from the spirit and scope of the technical solutions of the present disclosure.
Claims (10)
1. A convolution operation device based on multimode interference, comprising:
the laser generation module is used for generating first laser;
the data input module is used for modulating data to be processed onto the first laser;
the delay module is used for delaying and splitting the modulated first laser to obtain N beams of second laser;
the multimode interference coupler is used for simultaneously carrying out multimode interference on the N beams of second lasers according to a preset convolution matrix and outputting M groups of optical signals; and
the detector array comprises M photoelectric detectors, wherein the M photoelectric detectors are used for respectively receiving the M groups of optical signals and detecting the intensity of the M groups of optical signals to obtain convolution operation results;
wherein M and N are positive integers.
2. The convolution operation apparatus according to claim 1, wherein said multimode interference coupler comprises N input ports and M output ports;
the multimode interference coupler is used for respectively receiving the N beams of second laser through the N input ports, and respectively splitting the N beams of second laser to the M output ports according to N groups of preset splitting ratios to obtain M groups of optical signals;
the N groups of preset beam splitting ratios are in one-to-one correspondence with the N beams of second laser.
3. The convolution operation apparatus according to claim 1, wherein said preset convolution matrix comprises M convolution kernels;
the multimode interference coupler is used for adjusting the intensity of the N beams of second laser according to the M convolution kernels respectively to obtain M groups of optical signals;
wherein the M convolution kernels are in one-to-one correspondence with the M groups of optical signals.
4. The convolution operation apparatus according to claim 1, wherein said multimode interference coupler comprises N input waveguides, M output waveguides and a multimode interference region;
the N input waveguides and the M output waveguides are respectively arranged at two sides of the multimode interference area at preset intervals.
5. The convolution operation apparatus according to claim 4, wherein the multimode interference region includes a plurality of multimode interference units and a plurality of tuning elements for adjusting refractive indexes of the plurality of multimode interference units, respectively.
6. The convolution operation apparatus according to any one of claims 2 to 5, wherein said multimode interference coupler further comprises N polarization controllers;
the N polarization controllers are used for respectively controlling the polarization states of the N beams of second laser light.
7. The convolution operation apparatus according to claim 1, wherein in a case where the at least one multimode interference coupler includes a plurality of multimode interference couplers, the plurality of multimode interference couplers are connected in parallel.
8. The convolution operation apparatus according to claim 1, wherein said data input module comprises:
the random waveform generator is used for converting the data to be processed into signals to be processed;
and the electro-optical modulator is used for receiving the signal to be processed and the first laser and modulating the signal to be processed onto the first laser.
9. The convolution operation apparatus according to claim 8, wherein said delay module comprises a beam splitter and at least N-1 optical delay lines, said data to be processed comprises N bits of data inputted consecutively, each bit of data lasting for one input period;
the beam splitter is used for dividing the modulated first laser into N beams to obtain N laser components;
the at least N-1 optical delay lines are used for respectively delaying the N laser components to obtain N beams of second laser;
wherein N-1 beams of the N beams of the second laser light are sequentially delayed by one of the input periods so that the N bits of data are simultaneously input to the multimode interference coupler.
10. A convolution operation method based on multimode interference, characterized in that it is based on a convolution operation device based on multimode interference according to any one of claims 1 to 9, said method comprising:
generating first laser by a laser generating module;
modulating data to be processed onto the first laser through a data input module;
delaying and splitting the modulated first laser by a delay module to obtain N beams of second laser;
simultaneously carrying out multimode interference on the N beams of second lasers according to a preset convolution matrix through at least one multimode interference coupler, and outputting M groups of optical signals;
the detector array comprises M photoelectric detectors, the M photoelectric detectors respectively receive the M groups of optical signals and detect the intensity of the M groups of optical signals to obtain convolution operation results;
wherein M and N are positive integers.
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