Reconfigurable matrix-vector multiplication unit based on single-waveguide micro-ring resonator and VO2 and implementation method

Abstract

The invention provides a reconfigurable matrix-vector multiplication unit based on a single-waveguide micro-ring resonator and VO2 and an implementation method. Systems and method examples disclosed herein include a single waveguide microring resonator structure, a phase change material VO2, and a waveguide, with functionality to implement an optically reconfigurable matrix-vector multiplication.

Description

Technical Field

[0001] The present invention relates to the technical field of optical matrix-vector multiplication, and in particular to a reconfigurable optical matrix-vector multiplication operation based on a single waveguide microring resonator and VO2 phase change material. Background Art

[0002] With the rapid development of science and technology, the limitations of traditional electronic integrated circuits in processing speed and energy efficiency have become increasingly obvious, seriously hindering the further improvement of information processing capabilities. In contrast, optical signals, with their ultra-wide bandwidth and powerful parallel processing capabilities, have shown significant advantages in improving processing speed, reducing energy consumption, and enhancing anti-interference capabilities, indicating their great potential to replace electrical signals in complex calculations. Silicon-based microring resonators have been successfully applied in the fields of optical switches and optical logic computing due to their compact size, low energy consumption, and excellent anti-interference performance.

[0003] By utilizing the free spectral range (FSR) characteristics of microring resonators, the desired signal can be accurately screened out from a large number of optical signals of different wavelengths. This characteristic opens up a new way to achieve efficient matrix operations. However, the matrix-vector multiplication operation structure currently on the market is not only complex and costly, but also lacks the necessary reconstruction flexibility, which limits the diversity of its application scenarios. In view of this, in order to meet the growing computing needs, it is necessary to develop a reconfigurable matrix-vector multiplication operation unit with a simple structure, convenient operation, and flexible application scenarios. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide a reconfigurable matrix-vector operation unit and an implementation method thereof.

[0005] A reconfigurable matrix-vector multiplication unit based on single waveguide microring resonator and VO2 for realizing the multiplication of m×n matrix and n×1 vector, characterized in that m rows of single waveguide microring resonator multiplication units are integrated. Each row of multiplication units contains n single waveguide microring resonator groups, wherein each group is composed of two single waveguide microring resonators and two VO2 phase change material elements and corresponding waveguide structures.

[0006] The reconfigurable matrix-vector multiplication unit is characterized in that the single waveguide microring resonator group is composed of two single waveguide microring resonators and two VO2 phase change materials. By controlling the metallic state and non-metallic state of the VO2 phase change material (at the same time, the same single waveguide microring resonator group has one and only one VO2 in the non-metallic state), optical path selection is completed, and light signals of different wavelengths are controlled to enter one of the input ends of the two single waveguide microring resonators of a microring resonator group. The transmittance of the single waveguide microring resonator can be changed by changing the ambient temperature. The transmitted light signal is output from the output end of the microring resonator and enters the subsequent single waveguide microring resonator group through the waveguide. The light of n different wavelengths in the optical signal passes through n single waveguide microring resonator groups in sequence to complete the above steps.

[0007] The reconfigurable vector-matrix multiplication unit is characterized in that the transmittance of the single waveguide microring resonator can be changed by its ambient temperature. There is a heating plate under each single waveguide microring resonator, and the transmittance of the single waveguide microring resonator can be changed by changing the heating voltage.

[0008] The reconfigurable matrix-vector multiplication unit is characterized in that the optical switch material is VO2, and the state of the VO2 phase change material can change the metallic state and the non-metallic state through the ambient temperature to achieve the purpose of optical switching. In a single waveguide microring resonator group, one and only one VO2 is in the non-metallic state, and one and only one optical path of the two microring resonators is conductive.

[0009] The reconfigurable matrix-vector multiplication unit is characterized in that the function realization process of the matrix-vector multiplication unit is: n optical signals a1, a2, ..., an are modulated to input n different wavelengths λ 1 ,λ 2 , …, λ n The light is input from the input end of the structure. After the modulated light enters the m rows of reconfigurable matrix-vector multiplication units, in one row, the light signals of different wavelengths correspond to the single waveguide microring resonator groups with different resonant frequencies, λ 1 After the light of wavelength passes through the single waveguide microring resonator group corresponding to the wavelength, the microring resonator with different transmittance is selected by the on-off of VO2, and the output is a1R11 or a1R11', whose value is determined by the on-off of VO2, and only one is in the on state. After the light signals of different wavelengths pass through n microring resonator groups, the output a1R11+a2R12+…+anR1n can be obtained (taking the single waveguide microring resonator group as an example in which one of the microring resonators is turned on). The outputs of the remaining rows are a1R21+a2R22+…anR2n; a1R31+a2R32+…anR3n:…; a1Rm1+a2Rm2+…anRmn. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 It is a schematic diagram of the 2×2 matrix and 2×1 vector multiplication operation of the present invention.

[0012] Figure 3 It is a schematic structural diagram of the silicon-based single waveguide microring resonator of the present invention. DETAILED DESCRIPTION

[0013] In order to more clearly explain the purpose, technical solution and advantages of the present invention, the specific implementation details of the present invention will be introduced in depth with the help of schematic diagrams. Through the following description and the content of the claims, the advantages and characteristics of the present invention will be fully demonstrated. It should be noted that all the drawings are in a highly simplified form, and the proportions are not accurate. The only purpose is to assist in understanding the purpose of the embodiments of the present invention in an intuitive and clear way. It is hereby explained that the specific embodiments shown here are only used as an explanation of the present invention, not to limit its scope of application.

[0014] The principle of matrix multiplication is to implement the multiplication operation between an input matrix α and an input vector β, and obtain the output vector γ. The specific calculation formula is as follows:

[0015] like Figure 1 As shown, the present invention can realize the above matrix-vector multiplication operation.

[0016] Figure 2 The schematic diagram of an embodiment of a 2×2 matrix and a 2×1 vector multiplication operation of the matrix-vector multiplication operation unit is shown below. The present invention is described in detail in conjunction with the embodiments and drawings. The multiplication operation formula of a 2×2 matrix and a 2×1 vector is shown below:

[0017] like Figure 2 As shown, the vector-matrix multiplication unit is integrated on the silicon substrate, which includes the first row of single-waveguide microring resonator multiplication units 1 and the second row of single-waveguide microring resonator multiplication units 2. The optical signals a1 and a2 are modulated to wavelengths λ1 and λ2, respectively. After being input from the input end, they pass through the optical splitter and enter the multiplication unit 1 and the multiplication unit 2, respectively. In the multiplication unit 1, when the optical signal passes through the first single-waveguide microring resonator group A, the two VO2 switches k11 and k11' on A can only have one turned on by controlling the temperature. Here, k11 is selected to be turned on and k11' is closed as an example. The wavelength that satisfies the resonance equation of the single-waveguide microring resonator group A is λ 1, after passing through the microring resonator, the output is a1R11, and the wavelength that satisfies the resonance equation of the B microring resonator group is λ2. The two VO2 switches k12 and k12' on B can also only have one turned on. Here, k12 is turned on and k12' is turned off. The output is a2R12, and the output of the multiplication unit of the single-waveguide microring resonator in the first row is a1R11+a2R12. Similarly, the output of the multiplication unit 2 of the microring resonator in the second row is a1R21+a2R22 (taking k21 and k22 as an example). In this way, the result is (a1R11+a2R12, a1R21+a2R22).

[0018] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A reconfigurable matrix-vector multiplication unit based on a single waveguide microring resonator and VO2 for multiplying an m×n matrix by an n×1 vector, characterized in that: M rows of single waveguide microring resonator multiplication units are integrated. Each row of multiplication units contains n single waveguide microring resonator groups, each of which is composed of two single waveguide microring resonators and two VO2 phase change material elements and corresponding waveguide structures.

2. The reconfigurable matrix-vector multiplication unit according to claim 1, characterized in that: The single waveguide microring resonator group is composed of two single waveguide microring resonators and two VO2 phase change materials. By controlling the metallic state and non-metallic state of the VO2 phase change material (at the same time, one and only one VO2 in the same single waveguide microring resonator group is in the non-metallic state), optical path selection is completed, and light signals of different wavelengths are controlled to enter one of the input ends of the two single waveguide microring resonators of a microring resonator group. The transmittance of the single waveguide microring resonator can be changed by changing the ambient temperature. The transmitted light signal is output from the output end of the microring resonator and enters the subsequent single waveguide microring resonator group through the waveguide. Light of n different wavelengths in the optical signal passes through n single waveguide microring resonator groups in sequence to complete the above steps.

3. The reconfigurable vector-matrix multiplication unit according to claim 1, characterized in that: The transmittance of the single waveguide microring resonator can be changed by its ambient temperature. There is a heating plate under each single waveguide microring resonator, and the transmittance of the single waveguide microring resonator can be changed by changing the heating voltage.

4. The reconfigurable matrix-vector multiplication unit according to claim 1, characterized in that: The optical switch material is VO2. The state of VO2 phase change material can change between metallic state and non-metallic state through ambient temperature to achieve the purpose of optical switching. In a single waveguide microring resonator group, only one VO2 is in non-metallic state, and only one optical path of two microring resonators is conductive.

5. The reconfigurable matrix-vector multiplication unit according to claim 1, characterized in that: The functional implementation process of the matrix-vector multiplication unit is as follows: n optical signals a1, a2, ..., an are modulated to input n different wavelengths λ1, λ2, ..., λ n On the light, input from the input end of the structure, the modulated light enters the m rows of reconfigurable matrix-vector multiplication units respectively. In one row, the light signals of different wavelengths correspond to the single waveguide microring resonator groups with different resonant frequencies. After the light of wavelength λ1 passes through the single waveguide microring resonator group corresponding to its wavelength, the microring resonator with different transmittance is selected by the on-off of VO2, and the output is a1R11 or a1R11', and its value is determined by the on-off of VO2, and only one is in the on state. After the light signals of different wavelengths pass through n microring resonator groups, the output a1R11+a2R12+……+anR1n can be obtained (taking the case where one of the microring resonators in the single waveguide microring resonator group is turned on as an example). The outputs of the remaining rows are a1R21+a2R22+……anR2n; a1R31+a2R32+……anR3n:……; a1Rm1+a2Rm2+……anRmn.

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