Optical half adder

Abstract

The invention discloses an optical half adder which comprises a micro-ring resonator module, a first multi-mode Mach-Zehnder interferometer (MZI) switch module and a second multi-mode MZI switch module, and the micro-ring resonator module, the first multi-mode MZI switch module and the second multi-mode MZI switch module are connected in sequence. According to the optical half adder provided by the invention, through the combination of the meticulously designed micro-ring resonator and the multimode MZI switch, accurate control and modulation of optical signals are realized, not only are wavelength and mode structures fused, but also the function of the half adder is realized.

Description

Technical Field

[0001] The invention relates to the field of integrated optoelectronic signal processing, in particular to an optical half adder. Background Art

[0002] With the rapid development of modern information technology, the requirements for data processing speed and efficiency are increasing. Traditional electronic logic devices, despite their great success in the field of integrated circuits, are gradually approaching their physical limits due to their inherent electron mobility limitations and thermal management issues. Therefore, it is particularly important to explore new logic devices to break through these limitations. Optical logic devices are regarded as strong candidates for future information technology due to their advantages such as high speed, low power consumption and resistance to electromagnetic interference. In particular, on the silicon photonics platform, optical logic devices realized using optical waveguide integration technology are not only compatible with existing CMOS processes, but also can be efficiently integrated with electronic devices.

[0003] In the research of optical logic devices, the combination of wavelength and mode is an important direction to improve the optical signal processing capabilities. The control of the wavelength dimension can realize the selection and modulation of different optical signals, while the control of the mode dimension can use different modes in the optical waveguide to realize the parallel transmission of signals. Although these two technologies have great potential in theory, in practical applications, how to effectively combine the wavelength and mode dimensions to realize more complex logic functions remains a challenge. At present, most research focuses on a single dimension, and logic devices combining wavelength and mode are relatively rare due to the complexity of their design and implementation. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing optical logic devices are only based on a single dimension of wavelength or mode, and there has been no practical attempt to process complex logic operations in multiple dimensions, especially the design of logic devices combining wavelength and mode is complex and difficult to implement. Therefore, the present invention provides an optical half adder, which realizes precise control and modulation of optical signals by combining a carefully designed microring resonator with a multi-mode Mach-Zehnder interferometer (MZI) switch, which not only integrates the wavelength and mode structure, but also realizes the function of a half adder.

[0005] To achieve the above-mentioned purpose, the present invention provides an optical half adder, comprising a microring resonator module (1), a first multimode MZI switch module (2) and a second multimode MZI switch module (3), wherein the microring resonator module (1), the first multimode MZI switch module (2) and the second multimode MZI switch module (3) are connected in sequence.

[0006] Furthermore, the microring resonator module (1) comprises a first waveguide (11), a second waveguide (12), a third waveguide (13), a fourth waveguide (14) and a microring (15); the first waveguide (11) is connected to the second waveguide (12); the third waveguide (13) is connected to the fourth waveguide (14); the microring (15) is a core component, integrated with the four waveguides and works in coordination with the four waveguides, and dynamically couples with the four waveguides by changing the resonant state of the microring, thereby accurately regulating the flow direction of the optical signal;

[0007] The first multi-mode MZI switch module (2) comprises a first waveguide (21), a second waveguide (22), a third waveguide (23), a fourth waveguide (24) and a mode conversion module (25); the first waveguide (21) is connected to an input end of the mode conversion module (25), the second waveguide (22) is connected to an output end of the mode conversion module (25), the third waveguide (23) is connected to an input end of the mode conversion module (25), and the fourth waveguide (24) is connected to an output end of the mode conversion module (25);

[0008] The second multimode MZI switch module (3) comprises a first waveguide (31), a second waveguide (32), a third waveguide (33), a fourth waveguide (34) and a mode conversion module (35); the first waveguide (31) is connected to an input end of the mode conversion module (35); the second waveguide (32) is connected to an output end of the mode conversion module (35); the third waveguide (33) is connected to an input end of the mode conversion module (35); and the fourth waveguide (34) is connected to an output end of the mode conversion module (35).

[0009] Furthermore, the second waveguide (12) of the microring resonator module (1) is connected to the first waveguide (21) of the first multimode MZI switch module (2); the third waveguide (13) of the microring resonator module (1) is connected to the third waveguide (23) of the first multimode MZI switch module (2); and the fourth waveguide (24) of the first multimode MZI switch module (2) is connected to the first waveguide (31) of the second multimode MZI switch module (3).

[0010] Furthermore, the microring resonator module (1) further comprises a modulation mechanism (01), the first multimode MZI switch module (2) further comprises a modulation mechanism (02), and the second multimode MZI switch module (3) further comprises a modulation mechanism (03). The modulation mechanism (01), the modulation mechanism (02), and the modulation mechanism (03) are all based on a thermal adjustment scheme, wherein a SiO2 layer is added to a silicon substrate, a silicon waveguide layer is added thereon, a heating electrode is laid above the silicon-based optical waveguide, and then a voltage is applied to the lead of the heating electrode. Current generates heat through the electrode, and the temperature of the silicon-based optical waveguide is changed by radiation, thereby changing the effective refractive index of the ring waveguide, and further changing the resonant wavelength of the microring resonator and the phase difference of the MZI double arms.

[0011] Furthermore, in the microring resonator module (1), an optical signal is inputted by using the first waveguide (11), and the microring resonator module (1) is modulated by controlling the modulation mechanism (01), and different electrical signal operands are applied, so that the microring resonator is in a resonant state or a non-resonant state.

[0012] Furthermore, when the microring resonator is in a resonant state, the optical signal input from the first waveguide (11) is coupled into the microring (15) and then output through the third waveguide (13); when the microring resonator is in a non-resonant state, the optical signal input from the first waveguide (11) does not pass through the microring (15) but is directly output through the second waveguide (12).

[0013] Furthermore, the mode conversion module (25) comprises an input-end mode converter waveguide module (251), an input-end Y-branch structure (252), an MZI transmission arm (253), an output-end Y-branch structure (254), and an output-end mode converter waveguide module (255); the input-end mode converter waveguide module (251) is connected to the input-end Y-branch structure (252), the input-end Y-branch structure (252) is connected to the MZI transmission arm (253), the MZI transmission arm (253) is connected to the output-end Y-branch structure (254), and the Y-branch structure (254) is connected to the output-end mode converter waveguide module (255). Specifically, the upper waveguide of the input-end mode converter waveguide module (251) is connected to the single port of the input-end Y-branch structure (252), the dual ports of the input-end Y-branch structure (252) are respectively connected to the left ports of the upper and lower arms of the MZI transmission arm (253), the right ports of the upper and lower arms of the MZI transmission arm (253) are respectively connected to the dual ports of the output-end Y-branch structure (254), and the single port of the Y-branch structure (254) is connected to the upper waveguide of the output-end mode converter waveguide module (255); wherein the modulation mechanism (02) is used to control one of the arms of the MZI transmission arm to adjust the phase difference of the dual arms.

[0014] Furthermore, the input mode converter waveguide module includes an upper waveguide and a lower waveguide. By setting the waveguide width of the upper and lower waveguides, the upper waveguide supports the mode transmission of TE0 mode and TE1 mode, and the lower waveguide only supports the TE0 mode transmission; an appropriate spacing between the upper and lower waveguides is set so that the TE0 mode of the lower waveguide can be coupled into the upper waveguide and converted into TE1 mode transmission.

[0015] Furthermore, when the TE0 mode is input on the left side of the input Y-branch structure, two TE0 modes with the same phase are output on the right side of the Y-branch; when the TE1 mode is input on the left side, two TE0 modes with opposite phases are output on the right side of the Y-branch.

[0016] Furthermore, the MZI transmission arm integrates a modulation mechanism (02), which generates a phase difference between two arms of the MZI, thereby adjusting the phase difference of the optical signal transmitted in the two arms, including two phase differences of 0 and π.

[0017] Technical Effects

[0018] The optical half adder provided by the present invention integrates the two dimensions of wavelength and mode to achieve simultaneous control of optical signals and realize complex logical operations. This combination is an innovative attempt in the field of optical logic devices. The optical half adder structure of the present invention has the reconfigurability and scalability of the optical logic architecture. The basic optical logic unit can be reconfigured and expanded according to different application requirements to build a more complex optical logic system, providing new possibilities for the flexibility and scalability of photonic integrated circuits. It also shows processing speed and power consumption advantages that surpass traditional electronic logic devices. Optical signals are not limited by electronic bottlenecks. This high-speed parallel processing capability gives optical logic devices significant advantages in application scenarios that require fast, large-scale data processing.

[0019] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an optical half adder according to a preferred embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a first multi-mode MZI switch module (2) of an optical half adder according to a preferred embodiment of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a second multi-mode MZI switch module (3) of an optical half adder in a preferred embodiment of the present invention;

[0023] Figure 4 The present invention is a schematic diagram of optical signal transmission of a first multi-mode MZI switch module (2) of an optical half adder according to a preferred embodiment of the present invention, including: in a straight-through state, optical signals are respectively input from (a) a first waveguide (21) and (b) a third waveguide (23); and in a crossover state, optical signals are respectively input from (c) the first waveguide (21) and (d) the third waveguide (23). DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In the following description, specific details such as specific internal procedures and techniques are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0026] like Figure 1 As shown, the present invention provides an optical half adder, which is an optical half adder based on a microring resonator and a multimode MZI switch, comprising a microring resonator module (1), a first multimode MZI switch module (2) and a second multimode MZI switch module (3). The microring resonator module (1) comprises a first waveguide (11), a second waveguide (12), a third waveguide (13) and a fourth waveguide (14) and a microring (15), wherein the first waveguide (11) is connected to the second waveguide (12), the third waveguide (13) is connected to the fourth waveguide (14), and the microring (15) is a core component, integrated with the four waveguides and works in coordination, and dynamically couples with the four waveguides by changing the resonance state of the microring, thereby accurately regulating the flow direction of the optical signal. Figure 2 and Figure 3The detailed decomposition structures of the first multimode MZI switch module (2) and the second multimode MZI switch module (3) are respectively shown. The first multimode MZI switch module (2) comprises a first waveguide (21), a second waveguide (22), a third waveguide (23), a fourth waveguide (24) and a mode conversion module (25), the first waveguide (21) is connected to the input end of the mode conversion module (25), the second waveguide (22) is connected to the output end of the mode conversion module (25), the third waveguide (23) is connected to the input end of the mode conversion module (25), and the fourth waveguide (24) is connected to the output end of the mode conversion module (25); specifically, The first waveguide (21) is connected to the upper waveguide of the input-end mode converter waveguide module (251) in the first mode conversion module (25), the second waveguide (22) is connected to the upper waveguide of the output-end mode converter waveguide module (255) in the mode conversion module (25), the third waveguide (23) is connected to the lower waveguide of the input-end mode converter waveguide module (251) in the mode conversion module (25), and the fourth waveguide (24) is connected to the lower waveguide of the output-end mode converter waveguide module (255). The second multi-mode MZI switch module (3) comprises a first waveguide (31), a second waveguide (32), a third waveguide (33), a fourth waveguide (34) and a mode conversion module (35), wherein the first waveguide (31) is connected to an input end of the mode conversion module (35), the second waveguide (32) is connected to an output end of the mode conversion module (35), the third waveguide (33) is connected to an input end of the mode conversion module (35), and the fourth waveguide (34) is connected to an output end of the mode conversion module (35). Specifically, the first waveguide (31) is connected to the upper waveguide of the input-end mode converter waveguide module (351) in the mode conversion module (35), the second waveguide (32) is connected to the upper waveguide of the output-end mode converter waveguide module (355) in the mode conversion module (35), the third waveguide (33) is connected to the lower waveguide of the input-end mode converter waveguide module (351) in the mode conversion module (35), and the fourth waveguide (34) is connected to the lower waveguide of the output-end mode converter waveguide module (355). The second waveguide (12) of the microring resonator module (1) is connected to the first waveguide (21) of the first multimode MZI switch module (2); the third waveguide (13) of the microring resonator module (1) is connected to the third waveguide (23) of the first multimode MZI switch module (2); and the fourth waveguide (24) of the first multimode MZI switch module (2) is connected to the first waveguide (31) of the second multimode MZI switch module (3).

[0027] The micro-ring resonator module (1), the first multi-mode MZI switch module (2) and the second multi-mode MZI switch module (3) all include modulation mechanisms, which are modulation mechanism 01 for modulating the micro-ring resonator module (1), modulation mechanism (02) for modulating the first multi-mode MZI switch module (2) and modulation mechanism (03) for modulating the second multi-mode MZI switch module (3). The modulation mechanism can be based on a thermal adjustment scheme, by adding a SiO2 layer on a silicon substrate, and then adding a silicon waveguide layer thereon, and laying a heating electrode above the silicon-based optical waveguide, applying a voltage to the lead of the heating electrode, and the current passing through the electrode generates heat, which changes the temperature of the silicon-based optical waveguide by radiation, thereby changing the effective refractive index of the ring waveguide, and then changing the resonant wavelength of the micro-ring resonator and the phase difference of the MZI double arms. Among them, the silicon substrate is not only a part of the modulation mechanism, but also a key element of the basic device structure. It provides physical support and optical property basis for the waveguide, ensuring that the waveguide can stably guide and control the transmission of optical signals.

[0028] A microring resonator module (1), wherein the first waveguide (11) is used to input an optical signal. The microring resonator module (1) is modulated by controlling a modulation mechanism (01) to apply different electrical signal operands so that the microring resonator is in different states such as a resonant state or a non-resonant state. When the microring resonator is in a resonant state, the optical signal input from the first waveguide (11) is coupled into the microring (15) and then output through the third waveguide (13); when the microring resonator is in a non-resonant state, the optical signal input from the first waveguide (11) does not pass through the microring (15) but is directly output through the second waveguide (12). When the microring resonator switches between a resonant state and a non-resonant state, the transmission path of the optical signal changes accordingly. This change directly affects the state of the optical signal when it reaches a target output port (22) or a target output port (34), thereby causing the output of the logic value S or C to change.

[0029] The first multi-mode MZI switch module (2) comprises a first waveguide (21), a second waveguide (22), a third waveguide (23), a fourth waveguide (24) and a mode conversion module (25), and its detailed decomposition structure is as follows: Figure 2As shown, the first waveguide (21) is connected to the upper waveguide of the input end mode converter waveguide module (251) in the mode conversion module (25), the second waveguide (22) is connected to the upper waveguide of the output end mode converter waveguide module (255) in the mode conversion module (25), the third waveguide (23) is connected to the lower waveguide of the input end mode converter waveguide module (251) in the mode conversion module (25), and the fourth waveguide (24) is connected to the lower waveguide of the output end mode converter waveguide module (255). The mode conversion module (25) includes an input end mode converter waveguide module (251), an input end Y branch structure (252), an MZI transmission arm (253), an output end Y branch structure (254) and an output end mode converter waveguide module (255). The modulation mechanism (02) is used to control one of the arms of the MZI transmission arm (253) to adjust the phase difference of the two arms. By applying different electrical signal operands, the phase difference between the two arms of the multi-mode MZI can be made 0 or π.

[0030] The input end mode converter waveguide module (251) in the mode conversion module (25) is divided into an upper waveguide and a lower waveguide. By setting the waveguide width of the upper and lower waveguides, the upper waveguide can support mode transmission of the TE0 mode and the TE1 mode, and the lower waveguide only supports TE0 mode transmission. The appropriate spacing between the upper and lower waveguides allows the TE0 mode of the lower waveguide to be coupled into the upper waveguide and converted into TE1 mode transmission. Specifically, when the TE0 mode is input to the left side of the upper waveguide, it will be directly output from the right side of the upper waveguide; when the TE0 mode is input to the left side of the lower waveguide, it will be converted into TE1 mode through mode coupling and output from the right side of the upper waveguide.

[0031] When the TE0 mode is inputted to the left side of the input end Y branch structure (252), two TE0 modes with the same phase are outputted on the right side of the Y branch. When the TE1 mode is inputted to the left side, two TE0 modes with opposite phases are outputted on the right side of the Y branch.

[0032] In the MZI transmission arm (253), one arm integrates a modulation mechanism (02), and the modulation mechanism (02) generates a phase difference between two arms of the MZI, thereby adjusting the phase difference of optical signals transmitted in the two arms. In the embodiment of the present invention, two phase differences of 0 and π can be generated in the two arms.

[0033] When two TE0 modes with the same phase are inputted to the left side of the output end Y branch structure (254), the TE0 mode is outputted at the right side of the Y branch. When two TE0 modes with opposite phases are inputted to the left side, the TE1 mode is outputted at the right side of the Y branch.

[0034] The output end mode converter waveguide module (255) also includes an upper waveguide and a lower waveguide. By setting the waveguide width of the upper and lower waveguides, the upper waveguide supports mode transmission of TE0 mode and TE1 mode, and the lower waveguide only supports TE0 mode transmission. The appropriate spacing between the upper and lower waveguides allows the TE1 mode of the upper waveguide to be coupled into the lower waveguide and converted into TE0 mode transmission. Specifically, when the TE0 mode is input to the left side of the upper waveguide, it will be directly output from the right side of the upper waveguide; when the TE1 mode is input to the left side of the upper waveguide, it will be converted into TE0 mode through mode coupling and output from the right side of the lower waveguide.

[0035] Taking the first multi-mode MZI switch module (2) as an example, Figure 4 The schematic diagram of the optical mode field transmission of the multi-mode MZI switch is shown. When the modulation mechanism (02) is adjusted so that the phase difference between the two arms of the multi-mode MZI is 0, the multi-mode MZI switch module is in a straight-through state. Specifically, the optical signal is input from the first waveguide (21), such as Figure 4 As shown in (a), the input optical mode is TE0 mode, which is directly transmitted to the input Y branch structure (252) through the upper waveguide of the input mode converter waveguide module (251), and is divided into two TE0 mode optical signals with the same phase. After the two optical signals pass through the MZI transmission arm (253), since the phase difference between the two arms is 0, they are still TE0 mode after being combined at the output Y branch structure (254), and are input from the upper waveguide of the output mode converter waveguide module (255), and finally output through the second waveguide (22). Therefore, when the phase difference between the two arms of the multimode MZI is 0, the optical signal is input from the first waveguide (21) and output from the second waveguide (22), indicating that the multimode MZI switch module is in a straight-through state.

[0036] When the modulation mechanism (02) is adjusted so that the phase difference between the two arms of the multimode MZI is 0, the multimode MZI switch module (2) is also in a straight-through state. Specifically, the optical signal is input from the third waveguide (23), such as Figure 4 As shown in (b), the input optical mode is TE0 mode, passes through the lower waveguide of the input mode converter waveguide module (251), enters the upper waveguide through mode coupling and becomes TE1 mode, and then enters the input Y branch structure (252), where it is divided into two TE0 mode optical signals with opposite phases. After these two optical signals pass through the MZI transmission arm (253), since the phase difference between the two arms is 0, they are still TE1 mode after being combined at the output end Y branch structure (254), and are input from the upper waveguide of the output end mode converter waveguide module (255), enter the lower waveguide through mode coupling and become TE0 mode, and finally output through the fourth waveguide (24). Therefore, when the phase difference between the two arms of the multi-mode MZI is 0, the optical signal is input from the third waveguide 23 and output from the fourth waveguide (24), indicating that the multi-mode MZI switch module is in a straight-through state.

[0037] When the modulation mechanism (02) is adjusted so that the phase difference between the two arms of the multimode MZI is π, the multimode MZI switch module (2) is in a cross state. Specifically, the optical signal is input from the first waveguide (21), such as Figure 4 As shown in (c), the input optical mode is TE0 mode, which passes through the upper waveguide of the input mode converter waveguide module (251) and is directly transmitted to the input Y branch structure (252), where it is divided into two TE0 mode optical signals with the same phase. After the two optical signals pass through the MZI transmission arm (253), due to the phase difference of the two arms being π, they are combined at the output Y branch structure (254) and become TE1 mode, and are input from the upper waveguide of the output mode converter waveguide module (255), enter the lower waveguide through mode coupling and become TE0 mode, and finally output through the fourth waveguide (24). Therefore, when the phase difference between the two arms of the multi-mode MZI is π, the optical signal is input from the first waveguide (21) and output from the fourth waveguide (24), indicating that the multi-mode MZI switch module is in a cross state.

[0038] When the modulation mechanism (02) is adjusted so that the phase difference between the two arms of the multimode MZI is π, the multimode MZI switch module (2) is in a cross state. Specifically, the optical signal is input from the third waveguide (23), such as Figure 4 As shown in (d), the input optical mode is TE0 mode, which passes through the lower waveguide of the input mode converter waveguide module (251), enters the upper waveguide through mode coupling and becomes TE1 mode, and then enters the input Y branch structure (252), where it is divided into two TE0 mode optical signals with opposite phases. After these two optical signals pass through the MZI transmission arm (253), due to the phase difference between the two arms being π, they are combined at the output end Y branch structure (254) and become TE0 mode, and are input from the upper waveguide of the output end mode converter waveguide module (255), and finally output through the second waveguide (22). Therefore, when the phase difference between the two arms of the multimode MZI is π, the optical signal is input from the third waveguide (23) and output from the second waveguide (22), indicating that the multimode MZI switch module is in a cross state.

[0039] By applying electrical signal operands of different logical numbers to the modulation mechanism, the working state of each module is regulated, and by selecting the output signal of the corresponding port, the logic value of the final output signal is controlled. In the optical half adder structure, the input signals are addends A and addends B, and the output signals are half-addends S and carry numbers C. In this embodiment, addend A corresponds to the electrical signal operand applied to the modulation mechanism (01) of the microring resonator module (1), addend B corresponds to the electrical signal operand applied to the modulation mechanism (02) of the first multi-mode MZI switch module (2) and the modulation mechanism (03) of the second multi-mode MZI switch module (3), the half-addend S corresponds to the output logic number of the second waveguide (22) of the first multi-mode MZI switch module (2), and the carry number C corresponds to the output logic number of the fourth waveguide (34) of the second multi-mode MZI switch module (3).

[0040] Definition: When the electrical signal operand A applied to the modulation mechanism (01) of the microring resonator module (1) is logic "0", the microring is in a resonant state. In this state, an input optical signal enters the microring resonator module (1) through a first waveguide (11), and after passing through the microring (15), the optical signal is output from a third waveguide (13).

[0041] Definition: When the electrical signal operand A applied to the modulation mechanism (01) of the microring resonator module (1) is logic "1", the microring is in a non-resonant state. In this state, the input optical signal enters the microring resonator module (1) through the first waveguide (11), does not pass through the microring, and is directly output by the second waveguide (12).

[0042] Definition: When the electrical signal operand B applied to the modulation mechanism (02) of the first multi-mode MZI switch module (2) and the modulation mechanism (03) of the second multi-mode MZI switch module (3) is logic "0", the phase difference between the two arms of the MZI is 0. This means that two TE0 mode optical signals with the same phase still maintain the same phase after passing through the two arms of the MZI, and two TE0 mode optical signals with opposite phases still maintain opposite phases after passing through the two arms of the MZI.

[0043] It is defined that when the electrical signal operand B applied to the modulation mechanism (02) of the first multi-mode MZI switch module (2) and the modulation mechanism (03) of the second multi-mode MZI switch module (3) is logic "1", the phase difference between the two arms of the MZI is π. In this state, two TE0 mode optical signals with the same phase become opposite in phase after passing through the two arms of the MZI, and two TE0 mode optical signals with opposite phases become the same in phase after passing through the two arms of the MZI.

[0044] By changing the electrical signal operands A and B of the modulation mechanisms (01), (02) and (03), different transmission paths of the optical signal are controlled. When the optical signal is output from the second waveguide (22) of the first multimode MZI switch module (2), it indicates S=1; if the optical signal is not output from the second waveguide (22), S=0. Similarly, when the optical signal is output from the fourth waveguide (34) of the second multimode MZI switch module (3), it indicates C=1; if the optical signal is not output from the fourth waveguide (34), C=0. Different logical combinations of A and B will produce four different implementation states, corresponding to different S and C output values. The specific implementation states are as follows:

[0045] The first implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies a logic "0" electrical signal (operand A), the microring resonator is in a resonant state. At the same time, when the modulation mechanism (02) of the first multimode MZI switch module (2) and the modulation mechanism (03) of the second multimode MZI switch module (3) apply a logic "0" electrical signal (operand B), the phase difference between the two arms of the MZI is 0. In this state, the input optical signal passes through the first waveguide (11) of the microring resonator module (1), passes through the microring (15), and is output by the third waveguide (13). Subsequently, the optical signal enters the third waveguide (23) of the first multimode MZI switch module (2) through the connecting waveguide. Since the phase difference between the two arms of the first multimode MZI is 0, the optical signal is directly output from the fourth waveguide (24), resulting in no optical signal output from the second waveguide (22), that is, S=0. The optical signal continues to enter the first waveguide (31) of the second multi-mode MZI switch module (3) through the connecting waveguide. Similarly, because the phase difference is 0, the optical signal is output from the second waveguide (32), and no optical signal is output from the fourth waveguide (34), that is, C=0.

[0046] The second implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies a logic "0" electrical signal (operand A), the microring resonator is in a resonant state. When the modulation mechanism (02) of the first multimode MZI switch module (2) and the modulation mechanism (03) of the second multimode MZI switch module (3) apply a logic "1" electrical signal (operand B), the phase difference between the two arms of the MZI is π. In this state, the input optical signal passes through the first waveguide (11) of the microring resonator module (1), passes through the microring (15), and is output from the third waveguide (13). Subsequently, the optical signal enters the third waveguide (23) of the first multimode MZI switch module (2) through the connecting waveguide. Since the phase difference between the two arms of the first multimode MZI is π, the optical signal is output from the second waveguide (22), that is, S=1. No optical signal is input to the second multi-mode MZI switch module (3), so the fourth waveguide (34) has no optical signal output, that is, C=0.

[0047] The third implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies a logic "1" electrical signal (operand A), the microring resonator is in a non-resonant state. At the same time, when the modulation mechanism (02) of the first multimode MZI switch module (2) and the modulation mechanism (03) of the second multimode MZI switch module (3) apply a logic "0" electrical signal (operand B), the phase difference between the two arms of the MZI is 0. In this state, the input optical signal does not pass through the microring and is directly output from the second waveguide (12) of the microring resonator module (1). Subsequently, the optical signal enters the first waveguide (21) of the first multimode MZI switch module (2) through the connecting waveguide. Since the phase difference between the two arms of the first multimode MZI is 0, the optical signal is output from the second waveguide (22), that is, S=1. No optical signal is input to the second multimode MZI switch module (3), so the fourth waveguide (34) has no optical signal output, that is, C=0.

[0048] The fourth implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies a logic "1" electrical signal (operand A), the microring resonator is in a non-resonant state. When the modulation mechanism (02) of the first multimode MZI switch module (2) and the modulation mechanism (03) of the second multimode MZI switch module (3) apply a logic "1" electrical signal (operand B), the phase difference between the two arms of the MZI is π. In this state, the input optical signal does not pass through the microring and is directly output from the second waveguide 12 of the microring resonator module (1). Subsequently, the optical signal enters the first waveguide (21) of the first multimode MZI switch module (2) through the connecting waveguide. Since the phase difference between the two arms of the first multimode MZI is π, the optical signal is output from the fourth waveguide (24), resulting in no optical signal output from the second waveguide (22), that is, S=0. The optical signal continues to enter the first waveguide (31) of the second multimode MZI switch module (3) through the connecting waveguide. Since the phase difference between the two arms of the second multimode MZI is π, the optical signal is output from the fourth waveguide (34), that is, C=1.

[0049] An optical half adder structure of the present invention combines wavelength and mode structure to realize the function of a half adder. In this design, the input addends A and B are input through the electrical signal controlling the modulation mechanism, and the output signal includes the half addend S and the carry number C, which are presented in the form of optical signals. The following is the truth table of the half adder:

[0050] A B S C 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1

[0051] The truth table value of the half adder is fixed, and the optical half adder provided by the present invention realizes this truth table. Existing optical logic devices mostly rely on the control of a single dimension of wavelength or mode, while the optical half adder provided by the present invention realizes efficient control of optical signals and complex logic operations by integrating the two dimensions of wavelength and mode. This design is an innovative attempt in the field of optical logic devices, and its technical advantages are mainly reflected in:

[0052] 1. Dual-dimensional control: This optical half adder can simultaneously control the optical signal in two dimensions: wavelength and mode. This capability greatly improves the flexibility and efficiency of optical signal processing.

[0053] 2. Reconfigurability and scalability: The structural design of the present invention allows the basic optical logic unit to be reconfigured and expanded according to specific application requirements, which not only provides the possibility of building more complex optical logic systems, but also significantly enhances the flexibility and scalability of photonic integrated circuits.

[0054] This optical half-adder design that combines wavelength and mode not only demonstrates innovation in theory, but also shows its significant advantages in optical signal processing efficiency and system scalability in practical applications.

[0055] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An optical half adder, characterized in that: It comprises a microring resonator module (1), a first multimode MZI switch module (2) and a second multimode MZI switch module (3), wherein the microring resonator module (1), the first multimode MZI switch module (2) and the second multimode MZI switch module (3) are connected in sequence.

2. An optical half adder as claimed in claim 1, characterized in that: The microring resonator module (1) comprises a first waveguide (11), a second waveguide (12), a third waveguide (13), a fourth waveguide (14) and a microring (15); the first waveguide (11) is connected to the second waveguide (12); the third waveguide (13) is connected to the fourth waveguide (14); the microring (15) is a core component, integrated with the four waveguides and works in coordination with them, and dynamically couples with the four waveguides by changing the resonant state of the microring, thereby accurately regulating the flow direction of the optical signal; The first multi-mode MZI switch module (2) comprises a first waveguide (21), a second waveguide (22), a third waveguide (23), a fourth waveguide (24) and a mode conversion module (25); the first waveguide (21) is connected to an input end of the mode conversion module (25), the second waveguide (22) is connected to an output end of the mode conversion module (25), the third waveguide (23) is connected to an input end of the mode conversion module (25), and the fourth waveguide (24) is connected to an output end of the mode conversion module (25); The second multi-mode MZI switch module (3) comprises a first waveguide (31), a second waveguide (32), a third waveguide (33), a fourth waveguide (34) and a mode conversion module (35); the first waveguide (31) is connected to an input end of the mode conversion module (35), the second waveguide (32) is connected to an output end of the mode conversion module (35), the third waveguide (33) is connected to an input end of the mode conversion module (35), and the fourth waveguide (34) is connected to an output end of the mode conversion module (35).

3. An optical half adder as claimed in claim 2, characterized in that: The second waveguide (12) of the microring resonator module (1) is connected to the first waveguide (21) of the first multimode MZI switch module (2); the third waveguide (13) of the microring resonator module (1) is connected to the third waveguide (23) of the first multimode MZI switch module (2); and the fourth waveguide (24) of the first multimode MZI switch module (2) is connected to the first waveguide (31) of the second multimode MZI switch module (3).

4. An optical half adder as claimed in claim 2, characterized in that: The microring resonator module (1) further comprises a modulation mechanism (01), the first multi-mode MZI switch module (2) further comprises a modulation mechanism (02), and the second multi-mode MZI switch module (3) further comprises a modulation mechanism (03). The modulation mechanism (01), the modulation mechanism (02), and the modulation mechanism (03) are all based on a thermal modulation scheme, wherein a SiO2 layer is added to a silicon substrate, a silicon waveguide layer is added thereon, a heating electrode is laid above the silicon-based optical waveguide, a voltage is then applied to the lead of the heating electrode, and current passes through the electrode to generate heat, which changes the temperature of the silicon-based optical waveguide by radiation, thereby changing the effective refractive index of the ring waveguide, and further changing the resonant wavelength of the microring resonator and the MZI double-arm phase difference.

5. An optical half adder as claimed in claim 4, characterized in that: In the microring resonator module (1), an optical signal is inputted via a first waveguide (11), and the microring resonator module (1) is modulated by controlling the modulation mechanism (01), and different electrical signal operands are applied, so that the microring resonator is in a resonant state or a non-resonant state.

6. An optical half adder as claimed in claim 5, characterized in that: When the microring resonator is in a resonant state, the optical signal input from the first waveguide (11) is coupled into the microring (15) and then output through the third waveguide (13); when the microring resonator is in a non-resonant state, the optical signal input from the first waveguide (11) does not pass through the microring (15) but is directly output through the second waveguide (12).

7. An optical half adder as claimed in claim 4, characterized in that: The mode conversion module (25) comprises an input-end mode converter waveguide module (251), an input-end Y-branch structure (252), an MZI transmission arm (253), an output-end Y-branch structure (254), and an output-end mode converter waveguide module (255); the input-end mode converter waveguide module (251) is connected to the input-end Y-branch structure (252), the input-end Y-branch structure (252) is connected to the MZI transmission arm (253), the MZI transmission arm (253) is connected to the output-end Y-branch structure (254), and the Y-branch structure (254) is connected to the output-end mode converter waveguide module (255). Specifically, the upper waveguide of the input-end mode converter waveguide module (251) is connected to the single port of the input-end Y-branch structure (252), the dual ports of the input-end Y-branch structure (252) are respectively connected to the left ports of the upper and lower arms of the MZI transmission arm (253), the right ports of the upper and lower arms of the MZI transmission arm (253) are respectively connected to the dual ports of the output-end Y-branch structure (254), and the single port of the Y-branch structure (254) is connected to the upper waveguide of the output-end mode converter waveguide module (255); The modulation mechanism (02) is used to control one of the MZI transmission arms to adjust the phase difference between the two arms.

8. An optical half adder as claimed in claim 7, characterized in that: The input-end mode converter waveguide module comprises an upper waveguide and a lower waveguide. By setting the waveguide widths of the upper and lower waveguides, the upper waveguide supports mode transmission of TE0 mode and TE1 mode, while the lower waveguide only supports TE0 mode transmission. An appropriate spacing between the upper and lower waveguides is set so that the TE0 mode of the lower waveguide is coupled into the upper waveguide and converted into TE1 mode transmission.

9. An optical half adder as claimed in claim 8, characterized in that: When the TE0 mode is input on the left side of the input end Y branch structure, two TE0 modes with the same phase are output on the right side of the Y branch; when the TE1 mode is input on the left side, two TE0 modes with opposite phases are output on the right side of the Y branch.

10. An optical half adder as claimed in claim 7, characterized in that: The MZI transmission arm integrates a modulation mechanism (02), and the modulation mechanism (02) generates a phase difference between two arms of the MZI, thereby adjusting the phase difference of optical signals transmitted in the two arms, including two phase differences of 0 and π.

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