Reconfigurable vector-vector multiplication structure based on micro-ring resonators and implementation method

Abstract

The invention provides a reconfigurable vector multiplication structure based on micro-ring resonators and VO2 and an implementation method. Structures and method examples disclosed herein include, based on a microring resonator structure, an optical switch VO2 and a phase change material GST, a function of implementing vector multiplication and reconfigurability.

Description

Technical Field

[0001] The present invention relates to the technical field of optical vector-vector multiplication, and specifically to a reconfigurable vector multiplication structure and method based on a micro-ring resonator and VO2. Background Art

[0002] In today's era, science and technology are developing rapidly. Traditional electronic integrated circuits are greatly limited due to their slow computing speed and high power consumption. Optical signals have the characteristics of fast transmission speed, strong anti-interference, low signal attenuation and high security. In the future, optical signals may replace electrical signals for computing, so optical computing research is of great significance. Relying on the characteristics of the free spectrum range (FSR) of microring resonators, they can be used in wavelength division multiplexing communication systems. In such systems, optical signals of different frequencies carry different information. The size of the FSR determines how many different channels can be accommodated within a given frequency range, so that more signal channels can be multiplexed, effectively increasing the capacity of the communication system. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a reconfigurable vector-vector operation unit structure and method.

[0004] To achieve the above object, the present invention adopts the following technical scheme: a reconfigurable vector multiplication unit based on microring resonator and VO2, characterized in that it includes n rows of vector-vector multiplication units, wherein one vector-vector multiplication unit includes a first microring resonator unit, m optical switch units, m phase change material units and a second microring resonator unit, and the vector-vector multiplication unit can realize the multiplication operation of 1×n vector and n×1 vector. Wherein n and m are integers greater than or equal to 2.

[0005] The first microring resonator unit is composed of one microring resonator, and contains optical signals of different wavelengths passing through the first microring resonator unit and input from the input end of the microring resonator. The optical signal of a specific wavelength resonates with the microring resonator and is output from the download end to the optical switch unit. The path is selected by the programmable optical switch, and the optical signal enters the phase change material unit after the switch selection. The m phase change material units are parallel to each other and are selected by the m optical switch units. After passing through the phase change material unit, the optical signal resonates through the second microring resonator unit to obtain an output signal. The output signals of the n second microring resonator units are superimposed and output from the Out end.

[0006] The material of the optical switch unit is VO2, the material of the phase change material unit is GST, the resonant frequency of the microring resonator of the second microring resonator unit in the same row is the same as the resonant frequency of the microring resonator of the first microring resonator unit, and the microring resonator unit on the input side is the first microring resonator unit, and the microring resonator unit on the output side is the second microring resonator unit.

[0007] A heating device is provided in each optical switch unit, and the temperature is adjusted by controlling the voltage of the heating device so as to control VO2 to be in a metallic state or a dielectric state, so as to realize the switching effect.

[0008] The function realization process of the vector-vector multiplication unit is as follows: the input signal is an optical signal of n different wavelengths, whose wavelengths are a1, a2, ..., an respectively. The signal satisfying the resonance frequency of the first microring resonator unit can output the optical signal with wavelength a1, a2, ..., an from the output end of the first microring resonator unit and enter the phase change material unit. Taking the optical switch unit k11 and the phase change material unit w11 as an example, if k11 is turned on, the signal a1w11 is output from the output end of the phase change material unit w11 after passing through the phase change material unit w11 selected by the optical switch unit k11, and at the same time, only one optical switch unit is turned on. In this case, if k11 is turned on, k12, k13, ..., k1m cannot be turned on, and the signal a1w11 enters the second microring resonator unit. The signal satisfying the resonance frequency of the second microring resonator unit is output from the download end of the microring resonator to obtain 1 output signal. Finally, the output results obtained by the n microring resonator units are added together to obtain the vector-vector multiplication result. If the optical switches k11, k21, ..., kn1 are selected, the final output result from the Output end is a1w11+a2w21+...+anwn1. Different optical switch units are selected by program control so that the optical signal passes through different phase change material units to realize the reconfigurable function. 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 1×2 vector and 2×1 vector multiplication operation of the present invention.

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

[0012] In order to describe the scheme and advantages of the present invention in more detail, the present invention will be further explained below with reference to the accompanying drawings and in combination with embodiments. The specific embodiments shown here are only used as an explanation of the present invention, rather than limiting the scope of its application.

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

[0014] like Figure 2 As shown, the vector-vector multiplication unit includes a first microring resonator unit 1, an optical switch unit 2, a phase change material unit 3, and a second microring resonator unit. An optical signal with a wavelength of a1, a2, ..., an is input from the signal input end of the first microring resonator unit. After passing through the first microring resonator unit 1, a signal with a wavelength of a1 that satisfies the resonance equation of the microring resonator MRR1 in the first microring resonator unit 1 is output from the download end of the first microring resonator unit 1, and a signal with a wavelength of a2 that satisfies the resonance equation of the microring resonator MRR2 in the first microring resonator unit is output from the download end of the first microring resonator unit and enters the optical switch unit 2. In the optical switch unit 2, the optical signal can only be output after one switch is turned on. Here we choose to pass through k11 and k21 as an example. At this time, the signal output from the output end of the optical switch unit 2 enters the phase change material unit 3. After passing through the phase change material units w11 and w21, the output signals are a1w11 and a2w21. The signal output from the phase change material unit 3 enters the second microring resonator unit. The microring resonator MRR1 in the second microring resonator can only select the optical signal with a wavelength of a1. Therefore, the signal output from the download end of the microring resonator MRR1 is a1w11. Similarly, the signal output from the microring resonator MRR2 is a2w21. The output signals of the microring resonators MRR1 and MRR2 are added together to obtain a signal a1w11+a2w21. The signal obtained by the addition operation is output from the Output end.

[0015] 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 vector multiplication unit based on a microring resonator and VO2, characterized in that: The invention comprises n rows of vector-vector multiplication units, wherein one vector-vector multiplication unit comprises a first microring resonator unit, m optical switch units, m phase change material units and a second microring resonator unit, and the vector-vector multiplication unit can realize the multiplication operation of a 1×n vector and an n×1 vector, wherein n and m are integers greater than or equal to 2.

2. The reconfigurable vector multiplication unit according to claim 1, characterized in that: The first microring resonator unit is composed of one microring resonator, and contains optical signals of different wavelengths passing through the first microring resonator unit and input from the input end of the microring resonator. The optical signal of a specific wavelength resonates with the microring resonator and is output from the download end to the optical switch unit. The path is selected by the programmable optical switch, and the optical signal enters the phase change material unit after the switch selection. The m phase change material units are parallel to each other and are selected by the m optical switch units. After passing through the phase change material unit, the optical signal resonates through the second microring resonator unit to obtain an output signal. The output signals of the n second microring resonator units are superimposed and output from the Out end.

3. The reconfigurable vector multiplication unit according to claim 1, characterized in that: The material of the optical switch unit is VO2, the material of the phase change material unit is GST, the resonant frequency of the microring resonator of the second microring resonator unit in the same row is the same as the resonant frequency of the microring resonator of the first microring resonator unit, and the microring resonator unit on the input side is the first microring resonator unit, and the microring resonator unit on the output side is the second microring resonator unit.

4. The reconfigurable vector multiplication unit according to claim 1, characterized in that: A heating device is provided in each optical switch unit, and the temperature is adjusted by controlling the voltage of the heating device so as to control VO2 to be in a metallic state or a dielectric state, so as to realize the switching effect.

5. The reconfigurable vector multiplication unit according to claim 1, characterized in that: The function realization process of the vector-vector multiplication unit is as follows: the input signal is an optical signal of n different wavelengths, whose wavelengths are a1, a2, ..., an respectively. The signal satisfying the resonance frequency of the first microring resonator unit can output the optical signal with wavelength a1, a2, ..., an from the output end of the first microring resonator unit and enter the phase change material unit. Taking the optical switch unit k11 and the phase change material unit w11 as an example, if k11 is turned on, the signal a1w11 is output from the output end of the phase change material unit w11 after passing through the phase change material unit w11 selected by the optical switch unit k11, and at the same time, only one optical switch unit is turned on. In this case, if k11 is turned on, k12, k13, ..., k1m cannot be turned on, and the signal a1w11 enters the second microring resonator unit. The signal satisfying the resonance frequency of the second microring resonator unit is output from the download end of the microring resonator to obtain 1 output signal. Finally, the output results obtained by the n microring resonator units are added together to obtain the vector-vector multiplication result. If the optical switches k11, k21, ..., kn1 are selected, the final output result from the Output end is a1w11+a2w21+...+anwn1. Different optical switch units are selected by program control so that the optical signal passes through different phase change material units to realize the reconfigurable function.

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