Reconfigurable optical matrix-vector multiplication unit based on micro-ring resonator and phase change material and implementation method

Abstract

The invention provides a reconfigurable optical matrix-vector multiplication unit based on a micro-ring resonator and a phase change material and an implementation method. The matrix-vector multiplication unit comprises a first micro-ring resonator unit, a phase change material unit, a second micro-ring resonator unit and waveguides connected with the first micro-ring resonator unit, the phase change material unit and the second micro-ring resonator unit. The first micro-ring resonator unit gates optical signals for the first time by means of a plurality of free spectral ranges, and after multiplication of the phase change material unit is completed, the second micro-ring resonator unit gates the optical signals of all wavelengths one by one. And finally, the gated signals are added as required to obtain an operation result of the matrix-vector multiplication operation.

Description

Technical Field

[0001] The 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 microring resonator and a phase change material. Background Art

[0002] With the continuous development of science and technology, traditional electronic integrated circuits are limited by their processing speed and energy loss, so they are greatly restricted, making it difficult to significantly improve information processing capabilities. Optical signals have the characteristics of high bandwidth and parallel processing, which enables optical signals to replace electrical signals for calculations. Silicon-based microring resonators can perform some optical switching and optical logic calculation functions with their advantages of small size, low power consumption, and strong anti-interference ability.

[0003] By utilizing the free spectrum range (FSR) characteristics of the microring resonator, multiple optical signals of different wavelengths can be selected from the microring resonator, thus having the ability to perform matrix operations. The existing matrix-multiplication operation structure is complex, expensive, and cannot be reconfigured, so it is necessary to develop a reconfigurable matrix-vector operation unit with a simpler structure. 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 method with a simple structure.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a reconfigurable optical matrix-vector multiplication unit based on a microring resonator and a phase change material, characterized in that it includes n matrix-vector multiplication units, wherein one matrix-vector multiplication unit includes a first microring resonator unit, m phase change material units and n second microring resonator units and a waveguide. The optical matrix-vector multiplication unit uses integrated optics to realize the multiplication operation of n×n matrix and n×1 vector, wherein the elements in the n×n matrix are binary numbers of 0 or 1, the elements in the n×1 vector are real numbers between 0 and 1, m and n are natural numbers greater than or equal to 2, and m is greater than or equal to n.

[0006] The first microring resonator unit is composed of a microring resonator, and optical signals of different wavelengths enter from the input end of the first microring resonator unit, and the signal satisfying the resonance equation of the first microring resonator unit is output from the download end of the first microring resonator unit and enters the phase change material unit through a waveguide. The m phase change material units are composed of m mutually parallel phase change materials. The signal output from the first microring resonator unit enters from the input end of the m phase change units and can only pass through one of the phase change materials in the m phase change material units, and then is output from the output end of the phase change material unit and enters the n second microring resonator units. The signal satisfying the resonance equation of the second microring resonator unit is output from the output end of the n second microring resonators to obtain n output signals.

[0007] The material of the phase change material unit is GST, and the microring resonator of the second microring resonator unit can only select one of the optical signals that meet the requirements of the first microring resonator unit for output.

[0008] The functional implementation process of the matrix-vector multiplication unit is: the input signal is a different wavelengths λ1, λ2, ..., the input signal is a different wavelengths λ1, λ2, ..., λ a The optical signal satisfying the resonance equation of the first microring resonator unit will be output from the output end of the first microring resonator unit with wavelengths of λ1, λ2, ..., λ n The optical signal enters the phase change material unit and is output from the output end of the phase change material unit after passing through a selected phase change material x1 (λ1+λ2+…+λ n ) x1, enters the input end of the second microring resonator unit, and the signal satisfying the resonance equation of the second microring resonator unit is output from the output end, and the obtained n output signals are λ1 x1, λ2 x1, ..., λ n x1, and finally the detector adds the output results to get the matrix-vector multiplication result, where a is a positive integer and a is greater than or equal to n. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the present invention.

[0010] Figure 2 It is a schematic diagram of the 2×2 matrix and 2×1 vector multiplication operation of the present invention.

[0011] Figure 3 It is a schematic structural diagram of the silicon-based microring resonator of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present invention more concise and clear, the specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. According to the following description and claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0013] The principle of matrix multiplication is to implement the multiplication operation between an input matrix a and an input vector b, and obtain the output vector c. The specific calculation formula is as follows:

[0014] When m=n, the input matrix a is a block matrix, or square matrix for short. Figure 1 As shown, the present invention can implement the above block matrix-vector multiplication operation.

[0015] like Figure 3 As shown in the schematic diagram of the structure of a silicon-based microring resonator, the optical signal enters from the input end. When the wavelength meets the resonance condition of the microring resonator, the optical signal is output from the download end. When the resonance condition is not met, the optical signal is output from the through end.

[0016] Figure 1 The schematic diagram of n matrix-vector multiplication units. The optical signal first enters the first microring resonator unit, and the optical signal that meets the resonance condition wavelength of the first microring resonator unit is output and enters the phase change material unit. The phase change material unit selects GST. In the phase change material unit, all output optical signals can only pass through one phase change material and then be output to the second microring resonator unit.

[0017] Figure 2 The figure is a schematic diagram of an embodiment of a 2×2 matrix and 2×1 vector multiplication operation of the matrix-vector multiplication operation unit. The present invention is described in detail below in conjunction with the embodiments and drawings.

[0018] The multiplication formula of a 2×2 matrix and a 2×1 vector is as follows:

[0019] like Figure 2 As shown, the optical matrix-vector multiplication unit is integrated on a silicon substrate, which includes a first microring resonator unit 1, a phase change material unit 2, and a second microring resonator unit 3. The wavelengths λ1, λ2, λ1 are input from the signal input end of the first microring resonator. ’ ,λ2 ’After passing through the first microring resonator unit 1, the optical signal satisfies the resonance equation of the microring resonator MRR1 in the first microring resonator unit 1 with wavelengths of λ1 and λ2, which are output from the download end of the first microring resonator unit 1 and enter the phase change material unit 2. In the phase change material unit 2, the optical signal can only be output after passing through one phase change material. Here we choose to pass through the phase change material x 11 As an example, the signal output from the output end of the phase change material unit 2 is λ1x 11 +λ2x 11 The signal output from the phase change material unit 2 enters the second microring resonator unit 3. The microring resonator MRR11 in the second microring resonator 3 can only select the optical signal with a wavelength of λ1, so the signal output from the download end of the microring resonator MRR11 is λ1x 11 , the microring resonator MRR12 can only select the optical signal with a wavelength of λ2, so the signal output from the download end of the microring resonator MRR12 is λ2x 11 Similarly, the signals output from the microring resonator MRR21 and the microring resonator MRR22 are λ1 and ’ x 21 and λ2 ’ x 21 The optical power meter is used to add the signals of microring resonator MRR11 and microring resonator MRR21, and the resulting signal is λ1x 11 +λ1 ’ x 21 , add the signals of microring resonator MRR12 and microring resonator MRR22, and the resulting signal is λ2x 11 +λ2 ’ x 21 . In this way, the obtained signal is the result of the operation of the output vector.

[0020] 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 optical matrix-vector multiplication unit based on microring resonators and phase change materials, characterized in that: The invention comprises n matrix-vector multiplication units, wherein one matrix-vector multiplication unit comprises a first microring resonator unit, m phase change material units, n second microring resonator units and a waveguide. The optical matrix-vector multiplication unit realizes the multiplication operation of n×n matrix and n×1 vector by integrated optics, wherein the elements in the n×n matrix are binary numbers of 0 or 1, the elements in the n×1 vector are real numbers between 0 and 1, m and n are natural numbers greater than or equal to 2, and m is greater than or equal to n.

2. The reconfigurable optical matrix-vector multiplication unit according to claim 1, characterized in that: The first microring resonator unit is composed of a microring resonator, and optical signals of different wavelengths enter from the input end of the first microring resonator unit, and the signal satisfying the resonance equation of the first microring resonator unit is output from the download end of the first microring resonator unit and enters the phase change material unit through a waveguide. The m phase change material units are composed of m mutually parallel phase change materials. The signal output from the first microring resonator unit enters from the input end of the m phase change units and can only pass through one of the phase change materials in the m phase change material units, and then is output from the output end of the phase change material unit and enters the n second microring resonator units. The signal satisfying the resonance equation of the second microring resonator unit is output from the output end of the n second microring resonators to obtain n output signals.

3. The reconfigurable optical matrix-vector multiplication unit according to claim 1, characterized in that: The material of the phase change material unit is GST, and the microring resonator of the second microring resonator unit can only select one of the optical signals that meet the requirements of the first microring resonator unit for output.

4. The reconfigurable optical matrix-vector multiplication unit according to claim 1, characterized in that: The functional implementation process of the matrix-vector multiplication unit is: The input signal is a different wavelengths λ1, λ2, ..., λ a The optical signal satisfying the resonance equation of the first microring resonator unit will be output from the output end of the first microring resonator unit with wavelengths of λ1, λ2, ..., λ n The optical signal enters the phase change material unit and is output from the output end of the phase change material unit after passing through a selected phase change material x1 (λ1+λ2+…+λ n )x1, enters the input end of the second microring resonator unit, and the signal satisfying the resonance equation of the second microring resonator unit is output from the output end, and the obtained n output signals are λ1 x1, λ2 x1, ..., λ n x1, and finally the detector adds the output results to get the matrix-vector multiplication result, where a is a positive integer and a is greater than or equal to n.

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