Optical logic device and logic implementation method therefor

Abstract

An optical logic device and a logic implementation method therefor. The optical logic device comprises: a first straight waveguide (20), a second straight waveguide (21), two ring waveguides (3), two phase change functional units (4), four electrodes (5) and an optical detection device. The two ring waveguides (3) are spaced between the first straight waveguide (20) and the second straight waveguide (21); the two phase change functional units (4) respectively cover upper surfaces of the two ring waveguides (3); and two ends of each phase change functional unit (4) are each connected to one electrode (5). The first straight waveguide (20) comprises a first input end (a) and a first output end (b), and the second straight waveguide (21) comprises a second output end (c), wherein the first output end (b) and the first input end (a) are arranged on different sides, the second output end (c) and the first input end (a) are arranged on the same side, the first input end (a) is used for inputting an optical signal, the optical signal is a signal that does not change the state of the phase change functional unit (4), and the state of the phase change functional unit (4) comprises a crystalline state and an amorphous state. Each ring waveguide (3) comprises a second input end, wherein the second input end is composed of electrodes (5) at two ends of a phase change functional unit (4), the ring waveguide (3) is used for coupling an optical signal in the first straight waveguide (20) to the ring waveguide (3) and coupling an optical signal in the ring waveguide (3) to the second straight waveguide (21), the second input end is used for inputting an electrical signal, and the electrical signal is a signal that can change the state of the phase change functional unit (4). The optical detection device is connected to both the first output end (b) and the second output end (c), and is used for monitoring the transmittance of the optical signal outputted by the first output end (b) and the second output end (c) when the phase change functional unit (4) is in different states. The optical logic device has the characteristics of a compact structure, simple operation and a large on-off ratio, thereby improving the computational speed and capability of optical logic operations.

Description

An optical logic device and its logic implementation method Technical Field

[0001] This application belongs to the interdisciplinary fields of optics, microelectronics and logic operations, and more specifically, relates to an optical logic device and its logic implementation method. Background Technology

[0002] With the continuous development of society, the improvement of device performance cannot be achieved solely by shrinking geometric dimensions; Moore's Law has almost come to an end. At the same time, the response speed of electronic devices has approached its physical limits, failing to meet the increasingly demanding needs of production and daily life. Compared to traditional electronic technology, using optical signals for information processing offers advantages such as faster processing speed, immunity to electromagnetic interference, and parallel processing capabilities.

[0003] With their compact size and excellent optical properties, microring resonators have become indispensable basic components in the field of silicon-based photonics. Active tunable silicon-based microrings based on thermo-optical and plasmonic dispersion effects have been widely used in optical switches, optical logic, optical modulators, and optical signal processing. However, microring resonators based on these effects are inherently volatile, requiring continuous voltage or optical pulses, and therefore have high power consumption.

[0004] In recent years, phase change materials have gradually emerged in the field of integrated optics. Phase change materials exhibit significant differences in refractive index under different phase states; high-speed, reversible, and repeatable switching between different phase states can be achieved under the triggering of electrical or optical signals; simultaneously, their phase state switching is "non-volatile," therefore, optical switches, optical logic devices based on non-volatile phase change materials do not require continuous energy input to maintain refractive index changes, which undoubtedly reduces device power consumption.

[0005] Currently, optical logic devices based on phase change materials can typically only implement the most basic Boolean logic operations. To implement more Boolean logic operations, it is necessary to either modify the structure of the optical logic device or increase the number of operation steps. Clearly, both modifying the structure and increasing the number of operation steps inevitably increase the complexity of the device structure and operation. Therefore, overcoming the problems of structural complexity, operational complexity, and poor computational speed and power in optical logic devices in related technologies is a pressing issue that needs to be addressed.

[0006] Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this application is to provide an optical logic device and its logic implementation method, which aims to solve the problems of complex structure, complex operation, poor computing speed and computing power of optical logic devices in related technologies.

[0008] To achieve the above objectives, this application provides an optical logic device, comprising:

[0009] The system consists of a first straight waveguide, a second straight waveguide, two ring waveguides, two phase-change functional units, four electrodes, and a photodetector.

[0010] Two annular waveguides are spaced between the first straight waveguide and the second straight waveguide, and two phase-change functional units are respectively covered on the upper surface of the two annular waveguides, with an electrode connected to each end of each phase-change functional unit.

[0011] The first straight waveguide includes a first input terminal and a first output terminal, and the second straight waveguide includes a second output terminal. The first output terminal and the first input terminal are disposed on opposite sides, and the second output terminal and the first input terminal are disposed on the same side. The first input terminal is used to input an optical signal, and the optical signal is a signal that does not change the state of the phase transition functional unit. The state of the phase transition functional unit includes crystalline and amorphous states.

[0012] Each ring waveguide includes a second input terminal, which is composed of electrodes at both ends of the phase-change functional unit. The ring waveguide is used to couple optical signals in the first straight waveguide to the ring waveguide and optical signals in the ring waveguide to the second straight waveguide. The second input terminal is used to input electrical signals, which are signals that can change the state of the phase-change functional unit.

[0013] The optical detection device is connected to the first output terminal and the second output terminal respectively, and is used to monitor the transmittance of the optical signal output by the first output terminal and the second output terminal of the phase change functional unit in different states.

[0014] In some embodiments, the first straight waveguide is disposed at a first distance from the ring waveguide, and the second straight waveguide is disposed at a second distance from the ring waveguide. The first distance is the distance at which the optical signal in the first straight waveguide is coupled to the ring waveguide, and the second distance is the distance at which the optical signal in the ring waveguide is coupled to the second straight waveguide.

[0015] In some embodiments, the phase change material constituting the phase change functional unit is a chalcogenide compound that can undergo a reversible phase transition of crystallization or amorphization under the action of an electrical signal.

[0016] In some embodiments, the chalcogenide compound is composed of a reversible phase change material containing one or more elements selected from Ge, Sb, and Te.

[0017] In some embodiments, the materials constituting the first straight waveguide, the second straight waveguide, and the ring waveguide are the same.

[0018] Secondly, this application provides a logic implementation method for an optical logic device, comprising:

[0019] The optical signal is input to the first input terminal;

[0020] The electrical signal is applied to or not applied to the second input terminal, wherein applying the electrical signal represents a logic value of 1, and not applying the electrical signal represents a logic value of 0;

[0021] The logic value of the first output terminal is determined based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device.

[0022] The logic value of the second output terminal is determined based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device.

[0023] The Boolean logic operation result of the optical logic device is determined based on the logic value of the first output terminal, the logic value of the second output terminal, and the logic value input at the second input terminal.

[0024] In some embodiments, determining the logic value of the first output terminal based on the transmittance of the optical signal output by the first output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes:

[0025] If the transmittance of the optical signal output from the first output terminal is greater than a preset value, the logic value of the first output terminal is determined to be 1.

[0026] If the transmittance of the optical signal output from the first output terminal is less than the preset value, the logic value of the first output terminal is determined to be 0.

[0027] In some embodiments, determining the logic value of the second output terminal based on the transmittance of the optical signal output by the second output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes:

[0028] If the transmittance of the optical signal output from the second output terminal is greater than the preset value, the logic value of the second output terminal is determined to be 1.

[0029] If the transmittance of the optical signal output from the second output terminal is less than the preset value, the logic value of the second output terminal is determined to be 0.

[0030] In some embodiments, before applying or not applying the electrical signal to the second input terminal, the method further includes:

[0031] A reset pulse is input to the second input terminal. The reset pulse is used to reset the phase change functional unit so that the phase change functional unit is in an initial state, which includes the crystalline state or the amorphous state.

[0032] In some embodiments, where the second input terminal on one of the ring waveguides represents a P input terminal and the second input terminal on the other ring waveguide represents a Q input terminal, the Boolean logic operation result is determined to include P operation, NOT P operation, Q operation, NOT Q operation, P AND Q operation, P AND NOT Q operation, P OR Q operation, P OR NOT Q operation, P implies Q operation, P implies NOT Q operation, P inverse implies Q operation, and P inverse implies NOT Q operation.

[0033] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0034] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art:

[0035] This application provides an optical logic device and its logic implementation method. By inputting an electrical signal to a second input terminal disposed on a ring waveguide, a phase-change functional unit (PCF) is heated, resulting in either crystallization or amorphization. Different logic inputs are achieved by controlling the crystallization state of the PCF. Utilizing the significant differences in the transmittance of optical signals when the PCF is in different states, the transmittance of the optical signal input to the first input terminal of the PCF in different states is monitored. This allows for the determination of the distinct switching states corresponding to each output terminal, obtaining the corresponding logic values, and achieving the output of logic results under different logic inputs. This application achieves multiple Boolean logic operations with just one step of inputting an electrical signal to the second input terminal, simplifying operation and improving the computational power of the optical logic device. Furthermore, since the optical logic device has two output terminals, two different Boolean logic operations can be implemented in a single operation, increasing the computational speed of the optical logic device. The micro-ring resonator constructed using a straight waveguide and a ring waveguide structure is smaller in size and has a simpler and more compact structure compared to optical logic devices in related technologies. Attached Figure Description

[0036] Figure 1 is a schematic diagram of the structure of an optical logic device provided in an embodiment of this application;

[0037] Figure 2 is a flowchart illustrating the logic implementation method of the optical logic device provided in an embodiment of this application;

[0038] Figure 3 is a schematic diagram of the optical field distribution of the optical logic device under the condition that the phase change materials on the two micro-ring resonators provided in the embodiments of this application are respectively amorphous and a combination of amorphous states.

[0039] Figure 4 is a schematic diagram of the optical field distribution of the optical logic device under the combination of amorphous and crystalline phase change materials on the two micro-ring resonators provided in the embodiments of this application.

[0040] Figure 5 is a schematic diagram of the optical field distribution of the optical logic device under the combination of crystalline and amorphous phase change materials on the two micro-ring resonators provided in the embodiments of this application.

[0041] Figure 6 is a schematic diagram of the optical field distribution of the optical logic device with phase change materials in crystalline state and crystalline combination state respectively on the two micro-ring resonators provided in the embodiments of this application;

[0042] Figure 7 is a schematic diagram of the transmission spectrum of the through output terminal of the optical logic device under different state combinations of phase change materials of the two phase change functional units provided in the embodiments of this application.

[0043] Figure 8 is a schematic diagram of the transmission spectrum of the Drop output terminal of the optical logic device under different state combinations of phase change materials of the two phase change functional units provided in the embodiments of this application. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] In this article, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this article indicates that the related objects are in an "or" relationship; for example, A / B means A or B.

[0046] The terms "first" and "second," etc., used in the specification and claims herein are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.

[0047] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0048] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.

[0049] The purpose of this application is to provide an optical logic device and its logic implementation method, which uses electrical pulses to control the state (crystalline / amorphous) of phase change materials and uses low-power detection optical signals that cannot cause phase change materials to undergo phase change to detect the state. This results in an optical logic device that can perform multiple (12 in total) Boolean logic operations in one step.

[0050] To achieve the above objectives, the technical solution adopted in this application is: an optical logic device and its logic implementation method. The optical logic device includes a first straight waveguide, a second straight waveguide, two ring waveguides, two phase-change functional units, four electrodes, and a photodetector. The optical logic device also has a first input terminal, two second input terminals, a first output terminal, and a second output terminal. The first input terminal serves as an optical input terminal for inputting optical signals, and the second input terminals serve as electrical input terminals for inputting electrical signals.

[0051] In terms of logic implementation, an electrical signal is input to the second input terminal to heat the phase change functional unit, causing a crystallization / amorphization phase transition, thereby controlling the crystallization state of the phase change material constituting the phase change functional unit to achieve logic input. A specific wavelength of light signal is input from the first input terminal for detection. Utilizing the significant transmittance difference of the phase change functional unit in different states, a photodetector connected to the first and second output terminals monitors the transmittance of the light signal at the first input terminal in different states, determining the significantly different switching states of each output terminal and obtaining the corresponding logic value (logic value "0" or logic value "1"), thus achieving the output of logic results under different logic inputs. Multiple Boolean logic operations can be implemented simply by inputting an electrical signal to the second input terminal, simplifying the operation and improving the computing power of the optical logic device. Furthermore, since this optical logic device has two output terminals, two different Boolean logic operations can be implemented in a single operation, improving the computing speed and efficiency of the optical logic device. The micro-ring resonator constructed using a straight waveguide and a ring waveguide structure in this application is smaller in size and has a simpler and more compact structure compared to optical logic devices in related technologies.

[0052] Next, the technical solutions provided in the embodiments of this application will be described.

[0053] As shown in Figure 1, an optical logic device provided in this application embodiment includes:

[0054] The system consists of a first straight waveguide, a second straight waveguide, two ring waveguides, two phase-change functional units, four electrodes, and a photodetector.

[0055] Two annular waveguides are spaced between the first straight waveguide and the second straight waveguide, and two phase-change functional units are respectively covered on the upper surface of the two annular waveguides, with an electrode connected to each end of each phase-change functional unit.

[0056] The first straight waveguide includes a first input terminal and a first output terminal, and the second straight waveguide includes a second output terminal. The first output terminal and the first input terminal are disposed on opposite sides, and the second output terminal and the first input terminal are disposed on the same side. The first input terminal is used to input an optical signal, and the optical signal is a signal that does not change the state of the phase transition functional unit. The state of the phase transition functional unit includes crystalline and amorphous states.

[0057] Each ring waveguide includes a second input terminal, which is composed of electrodes at both ends of the phase-change functional unit. The ring waveguide is used to couple optical signals in the first straight waveguide to the ring waveguide and optical signals in the ring waveguide to the second straight waveguide. The second input terminal is used to input electrical signals, which are signals that can change the state of the phase-change functional unit.

[0058] The optical detection device is connected to the first output terminal and the second output terminal respectively, and is used to monitor the transmittance of the optical signal output by the first output terminal and the second output terminal of the phase change functional unit in different states.

[0059] In its specific implementation, the optical logic device includes a first straight waveguide 20 and a second straight waveguide 21, two ring waveguides 3, two phase-change functional units 4, four electrodes 5, and a photodetector. The first straight waveguide 20 includes a first input terminal (port a) and a first output terminal (port b), and the second straight waveguide 21 includes a second output terminal (port c).

[0060] Two ring waveguides 3 are spaced apart between the two first straight waveguides 20 and the second straight waveguide 21. A certain distance exists between the ring waveguide 3 and both the first straight waveguide 20 and the second straight waveguide 21. The ring waveguide 3 can couple optical signals from the first straight waveguide 20 into the ring waveguide 3, and vice versa. Two phase-change functional units 4 are respectively covered on the upper surfaces of the two ring waveguides 3, and each phase-change functional unit 4 has an electrode 5 connected to both ends. Electrical signals can be input to a second input terminal on the ring waveguide 3 through these electrodes 5. In one example, this second input terminal is composed of the electrodes at both ends of the phase-change functional unit, namely a P input terminal and a Q input terminal.

[0061] The optical logic device in this embodiment includes two second input terminals, one first input terminal, a first output terminal (i.e., port b), and a second output terminal (i.e., port c). The two second input terminals on the ring waveguide 3 serve as electrical input terminals, the first input terminal (i.e., port a) on the first straight waveguide 20 serves as an optical input terminal, and the first output terminal (i.e., port b) on the first straight waveguide 20 and the second output terminal on the second straight waveguide 21 serve as two optical output terminals. An electrical signal is applied to the phase change material constituting the phase change functional unit 4 through electrodes 5 connected to the two second input terminals, causing the phase change material to undergo a phase change and realizing a write operation. This electrical signal is a signal that can change the state of the phase change functional unit 4, and it can be an electrical pulse.

[0062] The first input terminal can be used to input a low-power optical signal that will not change the state of the phase change functional unit 4. This optical signal can be an optical pulse or continuous light. The state of the phase change functional unit 4 includes crystalline and amorphous states. When the phase change material constituting the phase change functional unit 4 crystallizes, the phase change functional unit 4 is in a crystalline state; when the phase change material constituting the phase change functional unit 4 amorphizes, the phase change functional unit 4 is in an amorphous state.

[0063] The first output terminal is a Through output terminal, and the second output terminal is a Drop output terminal. The Through output terminal is located at another port (i.e., port b) of the first straight waveguide 20 where the first input terminal is located. The Drop output terminal is located on another straight waveguide (i.e., the second straight waveguide 21) different from the first input terminal, and its position is on the same side as the first input terminal (i.e., port c). Since the phase change material constituting the phase change functional unit 4 has a large difference in transmittance at the output terminals of the optical logic device under different states, after applying an electrical pulse to the phase change functional unit 4 through the second input terminal to realize the logic writing operation, the transmittance of the optical signal output from the first output terminal and the second output terminal after the optical signal input for detection at the first input terminal passes through the optical logic device can be monitored by an optical detection device connected to the first output terminal and the second output terminal, thereby realizing the read operation of the logic values ​​of the first output terminal and the second output terminal.

[0064] It should be noted that the optical logic device provided in this application embodiment can implement 12 Boolean logic operations in one step without changing the device structure, and since it has two optical output terminals, it can implement two different Boolean logic operations in one operation.

[0065] In one example, an optical signal is input to the first input terminal a on the first direct waveguide 20. By detecting the transmittance of the Through output terminal and the Drop output terminal in the optical logic device, the switching state of different ports of the optical logic device is determined, thereby outputting the logic value "0" or "1".

[0066] By performing logic write and read operations on phase-change functional unit 4, the optical logic device can implement 12 Boolean logic operations. Furthermore, since it has two optical output terminals, it can perform two different Boolean logic operations in a single operation.

[0067] In one example, the 12 Boolean logic operations can specifically include P operation, Q operation, NOT P operation, NOT Q operation, P AND Q operation, P AND NOT Q operation, P OR Q operation, P OR NOT Q operation, P implies Q operation, P implies NOT Q operation, P inverse implies Q operation, and P inverse implies NOT Q operation.

[0068] This application provides an optical logic device that, by inputting an electrical signal to a second input terminal disposed on a ring waveguide, heats a phase-change functional unit (PCU) to induce a crystalline or amorphous phase transition. Different logic inputs are achieved by controlling the crystalline state of the PCU. Utilizing the significant differences in the transmittance of optical signals under different phase-change functional states, the transmittance of the optical signal input to the first input terminal of the PCU in different states is monitored. This allows for the determination of distinct switching states at each output terminal, resulting in corresponding logic values ​​and enabling the output of logic results under different logic inputs. This application achieves multiple Boolean logic operations with just one step of inputting an electrical signal to the second input terminal, simplifying operation and improving the computational power of the optical logic device. Furthermore, since the optical logic device has two output terminals, two different Boolean logic operations can be implemented in a single operation, increasing the computational speed. The micro-ring resonator, constructed using a straight waveguide and a ring waveguide structure, is smaller in size and has a simpler and more compact structure compared to optical logic devices in related technologies.

[0069] Furthermore, in some embodiments, the first straight waveguide is disposed at a first distance from the ring waveguide, and the second straight waveguide is disposed at a second distance from the ring waveguide. The first distance is the distance at which the optical signal in the first straight waveguide is coupled to the ring waveguide, and the second distance is the distance at which the optical signal in the ring waveguide is coupled to the second straight waveguide.

[0070] In a specific implementation, the first straight waveguide 20 is positioned at a first distance from the ring waveguide 3, and the second straight waveguide 21 is positioned at a second distance from the ring waveguide 3. The first distance can be the distance at which an optical signal input from the first input terminal of the first straight waveguide 20 is coupled into the ring waveguide 3, and this first distance can also be called the coupling gap. The second distance can be the distance at which an optical signal in the ring waveguide 3 is coupled into the second straight waveguide 21, and this second distance can also be called the coupling gap.

[0071] Furthermore, in some embodiments, the phase change material constituting the phase change functional unit is a chalcogenide compound that can undergo a reversible phase transition of crystallization or amorphization under the action of an electrical signal.

[0072] In specific implementation, the phase change material used in phase change functional unit 4 is a chalcogenide compound that can undergo reversible phase change of crystallization or amorphization under the action of an electrical signal.

[0073] Furthermore, in some embodiments, the chalcogenide compound is composed of a reversible phase change material containing one or more elements selected from Ge, Sb, and Te.

[0074] In a specific implementation, the chalcogenide compound is composed of a reversible phase change material containing one or more elements selected from Ge, Sb, and Te. For example, the chalcogenide compound can be Sc. 9.19 (Ge2Sb2Te5) 90.81 .

[0075] It is understood that, in the embodiments of the present invention, Sc 9.19 (Ge2Sb2Te5) 90.81 Examples of chalcogenide compounds that can undergo reversible phase transitions of crystallization or amorphization are provided for illustration, but are not intended to limit the scope of protection of this invention in any way. Any chalcogenide compound that can undergo reversible phase transitions of crystallization or amorphization under the action of an electrical signal should fall within the protection scope of the phase change material used in the phase change functional unit 4 of this invention.

[0076] Furthermore, in some embodiments, the materials constituting the first straight waveguide, the second straight waveguide, and the ring waveguide are the same.

[0077] In practice, the first straight waveguide 20, the second straight waveguide 21 and the ring waveguide 3 are made of the same material, and the four electrodes 5 are all metal electrodes. The materials used are all metal materials with good conductivity, such as platinum Pt and copper Cu for electrode 5.

[0078] For example, the first straight waveguide, the second straight waveguide, and the ring waveguide are made of silicon.

[0079] For example, the wavelength of the optical signal input to the first input terminal is 1550nm.

[0080] This application also provides a logic implementation method for an optical logic device.

[0081] As shown in Figure 2, an embodiment of this application provides a logic implementation method for an optical logic device, including steps 110, 120, 130, 140 and 150.

[0082] Step 110: Input the optical signal into the first input terminal.

[0083] Step 120: Apply or not apply the electrical signal to the second input terminal, wherein applying the electrical signal represents a logic value of 1, and not applying the electrical signal represents a logic value of 0.

[0084] Step 130: Determine the logic value of the first output terminal based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device.

[0085] Step 140: Determine the logic value of the second output terminal based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device.

[0086] Step 150: Determine the Boolean logic operation result of the optical logic device based on the logic value of the first output terminal, the logic value of the second output terminal, and the logic value input at the second input terminal.

[0087] In a specific implementation, in step 110, a light signal of a specific wavelength from the above embodiment is input to the first input terminal (i.e., port a) on the first direct waveguide 20 for detection. This light signal can be a light pulse or continuous light, and it does not change the state of the phase transition functional unit 4. In one example, the wavelength of this light signal is 1550 nm.

[0088] In step 120, based on the Boolean logic input, an electrical signal as described in the above embodiment is applied or not applied to the second input terminal on the ring waveguide 3 through two electrodes 5 connected to each phase change functional unit 4. This electrical signal is an electrical pulse that can cause the phase change material constituting the phase change functional unit 4 to undergo a crystallization or amorphization phase transition. Applying the electrical pulse represents a logic value "1", and not applying the electrical pulse represents a logic value "0".

[0089] By utilizing the significant differences in transmittance between the light output terminal and the light input terminal of the phase transition functional unit 4 in different states (including crystallized and amorphous states), corresponding logic values ​​can be obtained, ultimately realizing 12 Boolean logic operations in a one-step operation.

[0090] In step 130, the logic value of the first output terminal is obtained by acquiring the transmittance of the light signal output by the first output terminal of the phase change function unit 4 under the above different states as monitored by the light detection device.

[0091] In step 140, the logic value of the second output terminal is obtained by acquiring the transmittance of the light signal output by the second output terminal of the phase change function unit 4 under the different states monitored by the light detection device.

[0092] Further, in some embodiments, determining the logic value of the first output terminal based on the transmittance of the optical signal output by the first output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes:

[0093] If the transmittance of the optical signal output from the first output terminal is greater than a preset value, the logic value of the first output terminal is determined to be 1.

[0094] If the transmittance of the optical signal output from the first output terminal is less than the preset value, the logic value of the first output terminal is determined to be 0.

[0095] Further, in some embodiments, determining the logic value of the second output terminal based on the transmittance of the optical signal output by the second output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes:

[0096] If the transmittance of the optical signal output from the second output terminal is greater than the preset value, the logic value of the second output terminal is determined to be 1.

[0097] If the transmittance of the optical signal output from the second output terminal is less than the preset value, the logic value of the second output terminal is determined to be 0.

[0098] In specific implementation, when the transmittance of the light signal output by the first output terminal is greater than a preset value, the logic value of the first output terminal is determined to be "1"; when the transmittance of the light signal output by the first output terminal is less than the preset value, the logic value of the first output terminal is determined to be "0".

[0099] When the transmittance of the light signal output from the second output terminal is greater than the preset value, the logic value of the second output terminal is determined to be "1"; when the transmittance of the light signal output from the second output terminal is less than the preset value, the logic value of the second output terminal is determined to be "0".

[0100] In step 150, based on the logic values ​​of the first and second output terminals obtained above, and combined with the logic value input at the second input terminal, the Boolean logic operation of the optical logic device and its operation result can be determined.

[0101] The logic implementation method of the optical logic device provided in this application involves inputting an electrical signal to the second input terminal disposed on a ring waveguide, causing the phase-change functional unit to heat up and generate a crystallization or amorphization phase transition. Different logic inputs are achieved by controlling the crystallization state of the phase-change functional unit. Utilizing the significant differences in the transmittance of the optical signal when the phase-change functional unit is in different states, the transmittance of the optical signal input to the first input terminal of the phase-change functional unit in different states is monitored. This determines the significantly different switching states corresponding to each output terminal, obtains the corresponding logic values, and realizes the output of logic results under different logic inputs. This application can achieve multiple Boolean logic operations with just one step of inputting an electrical signal to the second input terminal, simplifying the operation and improving the computing power of the optical logic device. Furthermore, since the optical logic device has two output terminals, two different Boolean logic operations can be achieved in a single operation, improving the computing speed of the optical logic device. The micro-ring resonator constructed using a straight waveguide and a ring waveguide structure is smaller in size and has a simpler and more compact structure compared to optical logic devices in related technologies.

[0102] Furthermore, in some embodiments, before applying or not applying the electrical signal to the second input terminal, the method further includes:

[0103] A reset pulse is input to the second input terminal. The reset pulse is used to reset the phase change functional unit so that the phase change functional unit is in an initial state, which includes the crystalline state or the amorphous state.

[0104] In specific implementation, before applying or not applying the aforementioned electrical signal to the second input terminal of the ring waveguide 3, a reset pulse needs to be input to the second input terminal. This reset pulse can be specifically used to reset the phase change functional unit 4 so that the phase change functional unit 4 is in the initial state under this logic. The initial state can specifically include a crystalline state or an amorphous state.

[0105] Furthermore, in some embodiments, where the second input terminal on one of the ring waveguides represents a P input terminal and the second input terminal on the other ring waveguide represents a Q input terminal, the Boolean logic operation result is determined to include P operation, NOT P operation, Q operation, NOT Q operation, P AND Q operation, P AND NOT Q operation, P OR Q operation, P OR NOT Q operation, P implies Q operation, P implies NOT Q operation, P inverse implies Q operation, and P inverse implies NOT Q operation.

[0106] In the specific implementation, the two second input terminals on the ring waveguide 3 are represented by P input terminal and Q input terminal respectively. The optical logic device in this embodiment can realize the following 12 Boolean logic operation results:

[0107] P operation, not P operation, Q operation, not Q operation, P and Q operation, P and not Q operation, P or Q operation, P or not Q operation, P implies Q operation, P implies not Q operation, P inverse implies Q operation, and P inverse implies not Q operation.

[0108] The 12 preset Boolean logic operation modes include:

[0109] P operation: Reset the crystallization state of the phase change material at the P and Q input terminals to the crystalline state respectively, and implement the P operation at the Drop output terminal.

[0110] Non-P operation: The crystallization state of the phase change material at the P and Q input terminals is reset to the crystalline state, and the non-P operation is implemented through the output terminal.

[0111] Q operation: The crystallization state of the phase change material at the P and Q input terminals is reset to the crystalline state, and the Q operation is implemented at the Drop output terminal.

[0112] Non-Q operation: The crystallization state of the phase change material at the P and Q input terminals is reset to the crystalline state, and the non-Q operation is implemented through the output terminal.

[0113] P and Q operations: The crystallization state of the phase change material at the P and Q input terminals is reset to the amorphous state, and the P and Q operations are realized through the output terminal.

[0114] P and Q operations: The crystallization state of the phase change material at the P and Q input terminals is reset to the amorphous state, and the P and Q operations are implemented at the Drop output terminal.

[0115] P or Q operation: Reset the crystallization state of the phase change material at the P and Q input terminals to the crystalline state respectively, and implement the P or non-Q operation at the Drop output terminal.

[0116] P or Q operation: Reset the crystallization state of the phase change material at the P and Q input terminals to the crystalline state respectively, and implement the P or Q operation through the output terminal.

[0117] P-implied Q operation: The phase change material at the P input terminal is reset to an amorphous state, and the phase change material at the Q input terminal is reset to a crystalline state. The P-implied Q operation is implemented through the output terminal.

[0118] P-implied non-Q operation: The phase change material at the P input terminal is reset to an amorphous state, the phase change material at the Q input terminal is reset to a crystalline state, and the P-implied non-Q operation is implemented at the Drop output terminal.

[0119] The P-inverse-Q operation resets the phase change material at the P input to a crystalline state and the phase change material at the Q input to an amorphous state, and the P-inverse-Q operation is implemented through the output.

[0120] P inverse implied non-Q operation: The phase change material at the P input terminal is reset to a crystalline state, the phase change material at the Q input terminal is reset to an amorphous state, and the P inverse implied non-Q operation is performed at the Drop output terminal.

[0121] In Example 1, optical simulation is performed using the optical logic device provided in the embodiments of this application, including material import, structural modeling, simulation settings, and simulation result analysis.

[0122] Referring to Figure 1, 1 is the substrate, 20 is the first straight waveguide, 21 is the second straight waveguide, 3 is the ring waveguide, 4 is the phase change functional unit, and 50 is the metal electrode. In this embodiment, the substrate 1 is made of SiO2 material, the ring waveguide 3, the first straight waveguide 20, and the second straight waveguide 21 are all made of Si material, the metal electrode 5 is made of Pt material, and the phase change material used in the phase change functional unit 4 is Sc-doped Ge2Sb2Te5. More specifically, port a is the first input terminal, port b is the Through output terminal (first output terminal), port c is the Drop output terminal (second output terminal), and the P and Q input terminals are the second input terminals.

[0123] More specifically, in the embodiments of this application, the chemical formula of the Sc-doped Ge2Sb2Te5 phase change material is Sc 9.19 (Ge2Sb2Te5) 90.81 The optical logic devices were simulated using Lumerical MODE.

[0124] In Example 2, to further illustrate the optical performance of the optical logic device provided in the example, the optical performance of the device based on Sc in Example 1 was monitored. 9.19 (Ge2Sb2Te5) 90.81 The optical field distribution of the phase change material optical logic device and the transmission spectrum near the 1550nm band of the two output ports were analyzed, and the results are shown in Figures 3-8.

[0125] Figures 3-6 show the optical field distribution of the optical logic device under different crystallization state combinations of the two phase change functional units. As can be seen from the figures, when the phase change materials constituting the two phase change functional units are both in a crystalline state, most of the optical signal input from the first direct waveguide 20 is output from the Through output terminal. In other cases, the optical signal input from the first direct waveguide 20 propagates through the ring waveguide 3 and then undergoes destructive phase interference with the light phase in the first direct waveguide 20, resulting in very low transmittance at the Through output terminal, with most light output from the Drop output terminal. To further investigate the optical output of the two output ports of the designed optical logic device, this embodiment uses an optical detection device to monitor the light transmittance of the two output ports (i.e., the Through output terminal and the Drop output terminal).

[0126] Figures 7 and 8 show the transmission spectra of the optical logic device output from the Through and Drop output terminals under different state combinations of phase change materials in the two phase change functional units. In Figure 7, a represents the amorphous Sc 9.19 (Ge2Sb2Te5) 90.81 Phase change material, where c represents crystalline Sc 9.19 (Ge2Sb2Te5) 90.81 Phase change materials, where a+c in the diagram represents amorphous Sc. 9.19 (Ge2Sb2Te5) 90.81 Phase change materials and crystalline Sc 9.19 (Ge2Sb2Te5) 90.81 The combination of phase change materials follows the same logic. As shown in Figures 7 and 8, the Through and Drop outputs exhibit a significant difference in transmittance when the phase change material is in a crystalline + crystalline state combination compared to other combinations. Therefore, in the subsequent Boolean logic design, the output of the Through output when the phase change material is in a crystalline + crystalline state combination is considered a logic value of "1", and the rest are considered logic values ​​of "0". Similarly, the output of the Drop output when the phase change material is in a crystalline + crystalline state combination is considered a logic value of "0", and the rest are considered logic values ​​of "1". Specific optical outputs and the output logic values ​​of the two ports are shown in Table 1.

[0127] Table 1: Optical Output of Optical Logic Devices at Both Output Terminals under Different Combinations of Phase Change Materials

[0128] In Example 3, this embodiment is a specific implementation of full Boolean logic on the optical logic device. First, reset pulses are input to the P and Q input terminals, causing the two phase-change functional units 4 to reach their corresponding initial states under this logic. Then, electrical pulses (logic value "1") or (logic value "0") are applied to the phase-change material according to the input logic value, causing the phase-change material to undergo a crystallization or amorphization phase transition / maintain its original state. Finally, a light signal of a specific wavelength is input for detection. Utilizing the significant differences in transmittance of the light signal under different states of the phase-change material, the corresponding logic value can be obtained, ultimately realizing 12 Boolean logic operations in a single operation.

[0129] Table 2: 12 Boolean Logic Operations (Preferred Methods)

[0130] Preferably, the 12 Boolean logic operations include: P operation, Q operation, NOT P operation, NOT Q operation, P AND Q operation, P NAND Q operation, P OR Q operation, P NOR Q operation, P IMP Q operation, P NIMP Q operation, P RIMP Q operation, and P RIMP Q operation, as detailed in Table 2.

[0131] The 12 Boolean logic operations are as follows:

[0132] (1) NOT P / P: Refer to Table 2 to reset the phase change material at the P and Q input terminals to the initial state (crystalline state).

[0133] When P=0, no electrical pulse is applied to the P input terminal, therefore the phase change material at the P input terminal remains crystalline. When the probe optical signal is input from the first direct waveguide, referring to Table 1, it can be seen that the logic value of the Through output terminal is "1", and the logic value of the Drop output terminal is "0". Therefore, the Through output terminal implements the logic operation NOT P=1, and the Drop output terminal implements the logic operation P=0.

[0134] When P=1, an electrical pulse is applied to the P input terminal to amorphize the crystalline phase change material; therefore, the phase change material at the P input terminal is amorphous. When the probe optical signal is input from the first direct waveguide, referring to Table 1, it can be seen that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through terminal implements the logic operation NOT P=0, and the Drop output terminal implements the logic operation P=1.

[0135] (2) NOT Q / Q: Refer to Table 2 to reset the phase change material at the P and Q input terminals to the initial state (crystalline state).

[0136] When Q=0, no electrical pulse is applied to the Q input terminal, therefore the phase change material at the Q input terminal remains crystalline. When the probe optical signal is input from the optical input terminal of the first direct waveguide, referring to Table 1, it can be seen that the logic value of the Through output terminal is "1", and the logic value of the Drop output terminal is "0". Therefore, the Through output terminal implements the logic operation NOT Q=1, and the Drop output terminal implements the logic operation Q=0.

[0137] When Q=1, an electrical pulse is applied to the Q input terminal to amorphize the crystalline phase change material; therefore, the phase change material at the Q input terminal is amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, it can be seen that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation NOT Q=0, and the Drop output terminal implements the logic operation Q=1.

[0138] (3) AND / NAND: Refer to Table 2 to reset the phase change material at the P and Q ends to the initial state (amorphous state).

[0139] When P=0 and Q=0, no electrical pulse is applied to either the P or Q input terminals, therefore the phase change materials at both input terminals remain amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P AND Q = 0 AND 0 = 0. The Drop output terminal implements the logic operation P NAND Q = 0 NAND 0 = 1.

[0140] When P=0 and Q=1, no electrical pulse is applied to the P input terminal, while an electrical pulse is applied to the Q input terminal, causing the amorphous phase change material to crystallize. Therefore, the phase change material at the P input terminal is amorphous, and the phase change material at the Q input terminal is crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P AND Q = 0 AND 1 = 0. The Drop output terminal implements the logic operation P NAND Q = 0 NAND 1 = 1.

[0141] When P=1 and Q=0, an electrical pulse is applied to the P input terminal to crystallize the amorphous phase change material. No electrical pulse is applied to the Q input terminal. Therefore, the phase change material at the P input terminal is crystalline, and the phase change material at the Q input terminal is amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P AND Q = 1 AND 0 = 0. The Drop output terminal implements the logic operation P NAND Q = 1 NAND 0 = 1.

[0142] When P=1 and Q=1, electrical pulses are applied to both P and Q inputs to crystallize the amorphous phase change material. Therefore, the phase change material at both P and Q inputs switches to a crystalline state. When the probe optical signal is input from the first direct waveguide, referring to Table 1, the logic value of the Through output is "1", and the logic value of the Drop output is "0". Therefore, the Through output implements the logic operation P AND Q = 1 AND 1 = 1. The Drop output implements the logic operation P NAND Q = 1 NAND 1 = 0.

[0143] (4) NOR / OR: Refer to Table 2 to reset the phase change material at the P and Q input terminals to the initial state (crystalline state).

[0144] When P=0 and Q=0, no electrical pulse is applied to either the P or Q input terminals, therefore the phase change materials at both input terminals remain crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, the logic value of the Through output terminal is "1", and the logic value of the Drop output terminal is "0". Therefore, the Through output terminal implements the logic operation P NOR Q=0 NOR 0=1. The Drop output terminal implements the logic operation P OR Q=0 OR 0=0.

[0145] When P=0 and Q=1, no electrical pulse is applied to the P input terminal, while an electrical pulse is applied to the Q input terminal, causing the crystalline phase change material to become amorphous. Therefore, the phase change material at the P input terminal is crystalline, and the phase change material at the Q input terminal is amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P NOR Q = 0 NOR 1 = 0. The Drop output terminal implements the logic operation P OR Q = 0 OR 1 = 1.

[0146] When P=1 and Q=0, an electrical pulse is applied to the P input terminal to amorphize the crystalline phase change material. No electrical pulse is applied to the Q input terminal; therefore, the phase change material at the P input terminal is amorphous, and the phase change material at the Q input terminal is crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal performs the logic operation P NOR Q = 1 NOR 0 = 0. The Drop output terminal performs the logic operation P OR Q = 1 OR 0 = 1.

[0147] When P=1 and Q=1, electrical pulses are applied to both P and Q inputs to amorphize the crystalline phase change material. Therefore, the phase change material at both P and Q inputs switches to an amorphous state. When the optical signal is input from the first direct waveguide, referring to Table 1, the logic value of the Through output is "0", and the logic value of the Drop output is "1". Therefore, the Through output implements the logic operation P NOR Q = 1 NOR 1 = 0. The Drop output implements the logic operation P OR Q = 1 OR 1 = 1.

[0148] (5) IMP / NIMP: See Table 2. Reset the phase change material at the P input terminal to the amorphous state and the phase change material at the Q input terminal to the crystalline state.

[0149] When P=0 and Q=0, no electrical pulse is applied to either the P or Q input terminals. Therefore, the phase change material at the P input terminal is amorphous, and the phase change material at the Q input terminal is crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P IMP Q=0 IMP 0=0. The Drop output terminal implements the logic operation P NIMP Q=0 NIMP 0=1.

[0150] When P=0 and Q=1, no electrical pulse is applied to input terminal P, while an electrical pulse is applied to input terminal Q, causing the crystalline phase change material to become amorphous. Therefore, the phase change materials at both input terminals P and Q are amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P IMP Q=0 IMP 1=0. The Drop output terminal implements the logic operation P NIMP Q=0 NIMP 1=1.

[0151] When P=1 and Q=0, an electrical pulse is applied to the P input terminal to crystallize the amorphous phase change material, while no electrical pulse is applied to the Q input terminal. Therefore, the phase change materials at both the P and Q input terminals are crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "1", and the logic value of the Drop output terminal is "0". Therefore, the Through output terminal implements the logic operation P IMP Q=1 IMP 0=1. The Drop output terminal implements the logic operation P NIMP Q=1 NIMP 0=0.

[0152] When P=1 and Q=1, applying an electrical pulse to the P input terminal causes the amorphous phase change material to crystallize, and applying an electrical pulse to the Q input terminal causes the crystalline phase change material to amorphize. Therefore, the phase change material at the P input terminal is crystalline, and the phase change material at the Q input terminal is amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P IMP Q=1 IMP 1=0. The Drop output terminal implements the logic operation P NIMP Q=1 NIMP 1=1.

[0153] (6) RIMP / RNIMP: See Table 2. The phase change material at the P input terminal is reset to the crystalline state, and the phase change material at the Q input terminal is reset to the amorphous state.

[0154] When P=0 and Q=0, no electrical pulse is applied to either the P or Q input terminals. Therefore, the phase change material at the P input terminal is crystalline, and the phase change material at the Q input terminal is amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P RIMP Q=0 RIMP 0=0. The Drop output terminal implements the logic operation P RNIMP Q=0 RNIMP 0=1.

[0155] When P=0 and Q=1, no electrical pulse is applied to the P input terminal, while an electrical pulse is applied to the Q input terminal to crystallize the amorphous phase change material. Therefore, the phase change materials at both the P and Q input terminals are crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "1", and the logic value of the Drop output terminal is "0". Therefore, the Through output terminal implements the logic operation P RIMP Q=0 RIMP 1=1. The Drop output terminal implements the logic operation P RNIMP Q=0 RNIMP 1=0.

[0156] When P=1 and Q=0, an electrical pulse is applied to the P input terminal to amorphize the crystalline phase change material, while no electrical pulse is applied to the Q input terminal. Therefore, the phase change materials at both the P and Q input terminals are amorphous. When the optical signal is input from the first direct waveguide, referring to Table 1, the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal performs the logic operation P RIMP Q=1 RIMP 0=0. The Drop output terminal performs the logic operation P RNIMP Q=1 RNIMP 0=1.

[0157] When P=1 and Q=1, applying an electrical pulse to the P input terminal causes the crystalline phase change material to become amorphous, and applying an electrical pulse to the Q input terminal causes the amorphous phase change material to become crystalline. Therefore, the phase change material at the P input terminal is amorphous, and the phase change material at the Q input terminal is crystalline. When the optical signal is input from the first direct waveguide, referring to Table 1, we know that the logic value of the Through output terminal is "0", and the logic value of the Drop output terminal is "1". Therefore, the Through output terminal implements the logic operation P RIMP Q=1 RIMP 1=0. The Drop output terminal implements the logic operation P RNIMP Q=1 RNIMP 1=1.

[0158] It should be understood that the above method is based on the optical logic device in the above embodiments, and its implementation principle and technical effect are similar to those described in the above optical logic device, and will not be repeated here.

[0159] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0160] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0161] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the components can rotate relative to each other after connection. "Sliding connection" refers to a connection where the components can slide relative to each other after connection. The directional terms mentioned in the embodiments of this application, such as "top," "bottom," "inner," "outer," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0162] Furthermore, the mathematical concepts mentioned in the embodiments of this application, such as symmetry, equality, parallelism, and perpendicularity, are limitations specific to the current technological level, rather than absolute and strict mathematical definitions. Slight deviations are permissible; approximations of symmetry, equality, parallelism, and perpendicularity are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0163] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical logic device, characterized in that, include: The system consists of a first straight waveguide, a second straight waveguide, two ring waveguides, two phase-change functional units, four electrodes, and a photodetector. Two annular waveguides are spaced between the first straight waveguide and the second straight waveguide, and two phase-change functional units are respectively covered on the upper surface of the two annular waveguides, with an electrode connected to each end of each phase-change functional unit. The first straight waveguide includes a first input terminal and a first output terminal, and the second straight waveguide includes a second output terminal. The first output terminal and the first input terminal are disposed on opposite sides, and the second output terminal and the first input terminal are disposed on the same side. The first input terminal is used to input an optical signal, and the optical signal is a signal that does not change the state of the phase transition functional unit. The state of the phase transition functional unit includes crystalline and amorphous states. Each ring waveguide includes a second input terminal, which is composed of electrodes at both ends of the phase-change functional unit. The ring waveguide is used to couple optical signals in the first straight waveguide to the ring waveguide and optical signals in the ring waveguide to the second straight waveguide. The second input terminal is used to input electrical signals, which are signals that can change the state of the phase-change functional unit. The optical detection device is connected to the first output terminal and the second output terminal respectively, and is used to monitor the transmittance of the optical signal output by the first output terminal and the second output terminal of the phase change functional unit in different states.

2. The optical logic device as described in claim 1, characterized in that, The first straight waveguide is positioned at a first distance from the ring waveguide, and the second straight waveguide is positioned at a second distance from the ring waveguide. The first distance is the distance at which the optical signal in the first straight waveguide is coupled to the ring waveguide, and the second distance is the distance at which the optical signal in the ring waveguide is coupled to the second straight waveguide.

3. The optical logic device as described in claim 1, characterized in that, The phase change material constituting the phase change functional unit is a chalcogenide compound that can undergo a reversible phase change of crystallization or amorphization under the action of an electrical signal.

4. The optical logic device as described in claim 3, characterized in that, The chalcogenide compounds are composed of reversible phase change materials containing one or more of the elements Ge, Sb, and Te.

5. The optical logic device according to any one of claims 1-4, characterized in that, The materials constituting the first straight waveguide, the second straight waveguide, and the ring waveguide are the same.

6. A logic implementation method for an optical logic device as described in any one of claims 1-5, characterized in that, include: The optical signal is input to the first input terminal; The electrical signal is applied to or not applied to the second input terminal, wherein applying the electrical signal represents a logic value of 1, and not applying the electrical signal represents a logic value of 0; The logic value of the first output terminal is determined based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device. The logic value of the second output terminal is determined based on the transmittance of the light signal output by the phase change functional unit in different states as monitored by the light detection device. The Boolean logic operation result of the optical logic device is determined based on the logic value of the first output terminal, the logic value of the second output terminal, and the logic value input at the second input terminal.

7. The logic implementation method of the optical logic device as described in claim 6, characterized in that, The step of determining the logic value of the first output terminal based on the transmittance of the light signal output by the first output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes: If the transmittance of the optical signal output from the first output terminal is greater than a preset value, the logic value of the first output terminal is determined to be 1. If the transmittance of the optical signal output from the first output terminal is less than the preset value, the logic value of the first output terminal is determined to be 0.

8. The logic implementation method of the optical logic device as described in claim 6, characterized in that, The step of determining the logic value of the second output terminal based on the transmittance of the light signal output by the second output terminal of the phase transition functional unit in different states as monitored by the optical detection device includes: If the transmittance of the optical signal output from the second output terminal is greater than the preset value, the logic value of the second output terminal is determined to be 1. If the transmittance of the optical signal output from the second output terminal is less than the preset value, the logic value of the second output terminal is determined to be 0.

9. The logic implementation method of the optical logic device as described in any one of claims 6-8, characterized in that, Before applying or not applying the electrical signal to the second input terminal, the method further includes: A reset pulse is input to the second input terminal. The reset pulse is used to reset the phase change functional unit so that the phase change functional unit is in an initial state, which includes the crystalline state or the amorphous state.

10. The logic implementation method of the optical logic device as described in claim 9, characterized in that, When the second input terminal on one of the ring waveguides represents the P input terminal and the second input terminal on the other ring waveguide represents the Q input terminal, the Boolean logic operation result is determined to include P operation, NOT P operation, Q operation, NOT Q operation, P AND Q operation, P AND NOT Q operation, P OR Q operation, P OR NOT Q operation, P implies Q operation, P implies NOT Q operation, P inverse implies Q operation, and P inverse implies NOT Q operation.

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