Optical half-adder

Abstract

The application discloses an optical half adder, comprising 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 sequentially connected. The optical half adder of the application realizes accurate control and modulation of optical signals through the combination of the micro-ring resonator and the multi-mode MZI switch, and not only integrates the wavelength and mode structure, but also realizes the function of the half adder.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of integrated optoelectronic signal processing, and in particular to an optical half-adder. BACKGROUND

[0002] In the rapid development of modern information technology, the requirements for data processing speed and efficiency are increasingly high. Although traditional electronic logic devices have achieved great success in the field of integrated circuits, they are gradually approaching the physical limit due to their inherent electron mobility limitations and thermal management problems. Therefore, it is particularly important to explore new logic devices to break through these limitations. Optical logic devices are considered as a strong candidate for future information technology due to their high speed, low power consumption and anti-electromagnetic interference advantages. Especially on the silicon optical platform, optical logic devices realized by using optical waveguide integration technology not only can be compatible with existing CMOS technology, but also can realize efficient integration with electronic devices.

[0003] In the research of optical logic devices, the combination of wavelength and mode dimensions is an important direction to improve the processing capacity of optical signals. The control of wavelength dimension can realize the selection and modulation of different optical signals, while the control of mode dimension can realize the parallel transmission of signals by using different modes in optical waveguides. Although these two technologies have great potential in theory, in practical applications, how to effectively combine wavelength and mode dimensions to realize more complex logic functions is still a challenge. At present, most researches focus on a single dimension, while the combination of wavelength and mode logic devices is relatively rare due to their complexity in design and implementation. SUMMARY

[0004] In view of the above defects of the prior art, the technical problem to be solved by the present application is that the existing optical logic devices are only based on a single dimension of wavelength or mode, and multi-dimensional processing of complex logic operations has not been practically attempted, especially the design of logic devices combining wavelength and mode is complex and difficult to implement. Therefore, the present application provides an optical half-adder, which realizes precise control and modulation of optical signals by combining a micro-ring resonator with a multi-mode Mach-Zehnder interferometer (MZI) switch, not only integrates wavelength and mode structures, but also realizes the function of a half-adder.

[0005] To achieve the above purpose, the present application provides an optical half-adder, comprising a micro-ring resonator module (1), a first multi-mode MZI switch module (2) and a second multi-mode MZI switch module (3), the micro-ring resonator module (1), the first multi-mode MZI switch module (2) and the second multi-mode MZI switch module (3) are connected in sequence.

[0006] Further, 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 with the second waveguide (12), the third waveguide (13) is connected with the fourth waveguide (14), the microring (15) is integrated with the four waveguides as a core component and works cooperatively, dynamically coupled with the four waveguides by changing the resonant state of the microring, so as to accurately control the flow direction of the optical signal.

[0007] 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 with the input end of the mode conversion module (25), the second waveguide (22) is connected with the output end of the mode conversion module (25), the third waveguide (23) is connected with the input end of the mode conversion module (25), and the fourth waveguide (24) is connected with the 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 with the input end of the mode conversion module (35), the second waveguide (32) is connected with the output end of the mode conversion module (35), the third waveguide (33) is connected with the input end of the mode conversion module (35), and the fourth waveguide (34) is connected with the output end of the mode conversion module (35).

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

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

[0011] Further, in the micro-ring resonator module (1), the light signal is input through the first waveguide (11), and the micro-ring resonator module (1) is modulated by controlling the modulation mechanism (01), and different electrical signal operating numbers are applied to make the micro-ring resonator in a resonant state or a non-resonant state.

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

[0013] Further, 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 input end mode converter waveguide module (251) is connected with the input end Y branch structure (252), the input end Y branch structure (252) is connected with the MZI transmission arm (253), the MZI transmission arm (253) is connected with the output end Y branch structure (254), and the Y branch structure (254) is connected with the output end mode converter waveguide module (255). Specifically, the upper waveguide of the input end mode converter waveguide module (251) is connected with the single port of the input end Y branch structure (252), the double ports of the input end Y branch structure (252) are respectively connected with the left side ports of the upper and lower arms of the MZI transmission arm (253), the right side ports of the upper and lower arms of the MZI transmission arm (253) are respectively connected with the double ports of the output end Y branch structure (254), and the single port of the Y branch structure (254) is connected with 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 between the two arms.

[0014] Further, the input end mode converter waveguide module includes an upper waveguide and a lower waveguide, the waveguide width of the upper and lower waveguides is set to make the upper waveguide support the mode transmission of TE0 mode and TE1 mode, and the lower waveguide only supports the transmission of TE0 mode; and the appropriate spacing between the upper and lower waveguides is set to make the TE0 mode of the lower waveguide coupled into the upper waveguide and become TE1 mode transmission.

[0015] Further, the input end Y branch structure outputs two routes of TE0 modes with the same phase on the right side of the Y branch when TE0 mode is input on the left side; and outputs two routes of TE0 modes with opposite phases on the right side of the Y branch when TE1 mode is input on the left side.

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

[0017] Technical effects

[0018] The optical half adder provided by the application combines the two dimensions of wavelength and mode, realizes the simultaneous control of optical signals, and realizes complex logic operations. This combination is an innovative attempt in the field of optical logic devices. The structure of the optical half adder has the reconfigurability and expandability of optical logic architecture. The basic optical logic unit can be reconfigured and expanded according to different application requirements to construct a more complex optical logic system, thereby providing new possibilities for the flexibility and expandability of photonic integrated circuits. Moreover, the optical half adder has the advantages of processing speed and power consumption that exceed traditional electronic logic devices. The optical signal is not limited by electronic bottlenecks, and the high-speed parallel processing capability makes the optical logic device have significant advantages in application scenarios requiring fast and large-scale data processing.

[0019] The concept, specific structure and technical effects of the application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the application. BRIEF DESCRIPTION OF DRAWINGS

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

[0021] Figure 2 is a structural schematic diagram of a first multimode MZI switch module (2) of an optical half adder according to a preferred embodiment of the application;

[0022] Figure 3 is a structural schematic diagram of a second multimode MZI switch module (3) of an optical half adder according to a preferred embodiment of the application;

[0023] Figure 4 is a schematic diagram of optical signal transmission of a first multimode MZI switch module (2) of an optical half adder according to a preferred embodiment of the application, which includes: the input conditions of optical signals from (a) the first waveguide (21) and (b) the third waveguide (23) in the straight-through state; and the input conditions of optical signals from (c) the first waveguide (21) and (d) the third waveguide (23) in the cross state. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0025] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as specific internal procedures, techniques, in order to thoroughly understand the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also 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 avoid unnecessary details that hinder the description of the present application.

[0026] As shown in Figure 1 The present application provides an optical half adder, which is an optical half adder based on a micro-ring resonator and a multi-mode MZI switch, comprising a micro-ring resonator module (1), a first multi-mode MZI switch module (2) and a second multi-mode MZI switch module (3). Among them, the micro-ring resonator module (1) comprises a first waveguide (11), a second waveguide (12), a third waveguide (13) and a fourth waveguide (14) and a micro-ring (15), the first waveguide (11) is connected with the second waveguide (12), the third waveguide (13) is connected with the fourth waveguide (14), the micro-ring (15) as the core component is integrated with the four waveguides and works cooperatively, changes the micro-ring resonant state, dynamically couples with the four waveguides, and thus accurately controls the flow direction of the optical signal. Figure 2 and Figure 3The detailed exploded structure of the first multimode MZI switch module (2) and the second multimode MZI switch module (3) is 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 with the input end in the mode conversion module (25), the second waveguide (22) is connected with the output end in the mode conversion module (25), the third waveguide (23) is connected with the input end in the mode conversion module (25), and the fourth waveguide (24) is connected with the output end in the mode conversion module (25); specifically, the first waveguide (21) is connected with 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 with the upper waveguide of the output end mode converter waveguide module (255) in the mode conversion module (25), the third waveguide (23) is connected with 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 with the lower waveguide of the output end mode converter waveguide module (255). 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 with the input end in the mode conversion module (35), the second waveguide (32) is connected with the output end in the mode conversion module (35), the third waveguide (33) is connected with the input end in the mode conversion module (35), and the fourth waveguide (34) is connected with the output end in the mode conversion module (35); specifically, the first waveguide (31) is connected with the upper waveguide of the input end mode converter waveguide module (351) in the mode conversion module (35), the second waveguide (32) is connected with the upper waveguide of the output end mode converter waveguide module (355) in the mode conversion module (35), the third waveguide (33) is connected with 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 with the lower waveguide of the output end mode converter waveguide module (355). The second waveguide (12) of the microring resonator module (1) is connected with the first waveguide (21) of the first multimode MZI switch module (2); the third waveguide (13) of the microring resonator module (1) is connected with 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 with 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 contain modulation mechanisms, which are modulation mechanism 01 of the micro-ring resonator module (1), modulation mechanism (02) of the first multi-mode MZI switch module (2) and modulation mechanism (03) of the second multi-mode MZI switch module (3) respectively. The modulation mechanism can be based on a thermal modulation scheme, add a SiO2 layer on the silicon substrate, then add a silicon waveguide layer on it, and lay a heating electrode above the silicon-based optical waveguide. A voltage is applied to the lead of the heating electrode, and the current generates heat through the electrode. 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 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 the basis of optical properties for the waveguide, ensuring that the waveguide can stably guide and control the transmission of optical signals.

[0028] The micro-ring resonator module (1), the first waveguide (11) is used for inputting an optical signal. By controlling the modulation mechanism (01), the micro-ring resonator module (1) is modulated, different electrical signal operating numbers are applied, and the micro-ring resonator is in different states such as resonant state or non-resonant state. When the micro-ring resonator is in the resonant state, the optical signal input from the first waveguide (11) is coupled into the micro-ring (15) and then output through the third waveguide (13); when the micro-ring resonator is in the non-resonant state, the optical signal input from the first waveguide (11) does not pass through the micro-ring (15), but is directly output through the second waveguide (12). When the micro-ring resonator switches between the resonant state and the non-resonant state, the transmission path of the optical signal will change accordingly. This change directly affects the state of the optical signal when it reaches the target output port (22) or the 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) includes 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 structure is as follows Figure 2As shown, the first waveguide (21) is connected to the upper waveguide of the input mode converter waveguide module (251) in the mode conversion module (25), the second waveguide (22) is connected to the upper waveguide of the output mode converter waveguide module (255) in the mode conversion module (25), the third waveguide (23) is connected to the lower waveguide of the input 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 mode converter waveguide module (255). The mode conversion module (25) comprises the input mode converter waveguide module (251), the input Y-branch structure (252), the MZI transmission arm (253), the output Y-branch structure (254) and the output 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 between the two arms. By applying different electrical signal operators, the phase difference between the two arms of the multimode MZI can be 0 or π.

[0030] The input 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 widths of the upper and lower waveguides, the upper waveguide can support the mode transmission of TE0 mode and TE1 mode, and the lower waveguide only supports the transmission of TE0 mode. The appropriate spacing between the upper and lower waveguides enables the TE0 mode of the lower waveguide to be coupled into the upper waveguide and become TE1 mode transmission. Specifically, when the TE0 mode is input from 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 from the left side of the lower waveguide, it will be changed to TE1 mode through mode coupling and output from the right side of the upper waveguide.

[0031] The input Y-branch structure (252) outputs two TE0 modes with the same phase on the right side of the Y-branch when TE0 mode is input on the left side. When TE1 mode is input on the left side, it outputs two TE0 modes with opposite phases on the right side of the Y-branch.

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

[0033] The output Y-branch structure (254) outputs TE0 mode on the right side of the Y-branch when two TE0 modes with the same phase are input on the left side. When two TE0 modes with opposite phases are input on the left side, it outputs TE1 mode on 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, the waveguide width of the upper waveguide and the lower waveguide is set so that the upper waveguide supports the mode transmission of TE0 mode and TE1 mode, and the lower waveguide only supports the mode transmission of TE0 mode, and the proper spacing between the upper waveguide and the lower waveguide enables the TE1 mode of the upper waveguide to be coupled into the lower waveguide and become TE0 mode transmission. Specifically, when the left side of the upper waveguide inputs TE0 mode, it is directly output from the right side of the upper waveguide; when the left side of the upper waveguide inputs TE1 mode, it is output from the right side of the lower waveguide by mode coupling as TE0 mode.

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

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

[0037] When the modulation mechanism (02) is regulated so that the phase difference of the two arms of the multimode MZI is π, the multimode MZI switch module (2) is in the cross state. Specifically, the optical signal is input from the first waveguide (21), as shown in Figure 4 (c), the input light mode is TE0 mode, which is 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 paths of TE0 mode optical signals with the same phase. After passing through the MZI transmission arm (253), the two paths of optical signals become TE1 mode after being combined at the output Y-branch structure (254) due to the phase difference of π between the two arms, and are input from the upper waveguide of the output mode converter waveguide module (255), and become TE0 mode by mode coupling into the lower waveguide, and are finally output through the fourth waveguide (24). Therefore, when the phase difference of the two arms of the multimode MZI is π, the optical signal is input from the first waveguide (21) and output from the fourth waveguide (24), indicating that the multimode MZI switch module is in the cross state.

[0038] When the modulation mechanism (02) is regulated so that the phase difference of the two arms of the multimode MZI is π, the multimode MZI switch module (2) is in the cross state. Specifically, the optical signal is input from the third waveguide (23), as shown in Figure 4 (d), the input light mode is TE0 mode, which is transmitted to the input Y-branch structure (252) through the lower waveguide of the input mode converter waveguide module (251) and is divided into two paths of TE0 mode optical signals with opposite phases. After passing through the MZI transmission arm (253), the two paths of optical signals become TE0 mode after being combined at the output Y-branch structure (254) due to the phase difference of π between the two arms, and are input from the upper waveguide of the output mode converter waveguide module (255), and are finally output through the second waveguide (22). Therefore, when the phase difference of 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 the cross state.

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

[0040] It is defined that when the electrical signal operating number 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, the input optical signal enters the microring resonator module (1) through the first waveguide (11), and after passing through the microring (15), the optical signal is output by the third waveguide (13).

[0041] It is defined that when the electrical signal operating number 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), and is directly output by the second waveguide (12) without passing through the microring.

[0042] It is defined that when the electrical signal operating number B applied to 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) is logic "0", the phase difference of the two arms of the MZI is 0. This means that the two TE0 mode optical signals with the same phase remain the same phase after passing through the two arms of the MZI, and the two TE0 mode optical signals with opposite phases remain opposite phases after passing through the two arms of the MZI.

[0043] It is defined that when the electrical signal operating number B applied to 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) is logic "1", the phase difference of the two arms of the MZI is π. In this state, the two TE0 mode optical signals with the same phase become opposite phases after passing through the two arms of the MZI, and the two TE0 mode optical signals with opposite phases become the same phase after passing through the two arms of the MZI.

[0044] By changing the electrical signal operating numbers A and B of the modulation mechanisms (01), (02) and (03), the 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), it indicates 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), it indicates 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 (operating number 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 (operating number B), the phase difference of 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 of 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), i.e., S = 0. The optical signal continues to enter the first waveguide (31) of the second multimode MZI switch module (3) through the connecting waveguide, and similarly, since 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), i.e., C = 0.

[0046] The second implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies a logic "0" electrical signal (operating number 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 (operating number B), the phase difference of 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 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 of the two arms of the first multimode MZI is π, the optical signal is output from the second waveguide (22), i.e., 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, i.e., C = 0.

[0047] The third implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies an electrical signal (operation number A) of logic "1", 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 an electrical signal (operation number B) of logic "0", the phase difference of the two arms of the MZI is 0. In this state, the input optical signal is not passed 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 of the two arms of the first multimode MZI is 0, the optical signal is output from the second waveguide (22), i.e., S=1. No optical signal is input to the second multimode MZI switch module (3), so there is no optical signal output from the fourth waveguide (34), i.e., C=0.

[0048] The fourth implementation state: when the modulation mechanism (01) of the microring resonator module (1) applies an electrical signal (operation number A) of logic "1", 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 an electrical signal (operation number B) of logic "1", the phase difference of the two arms of the MZI is π. In this state, the input optical signal is not passed 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 of 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), i.e., S=0. The optical signal continues to enter the first waveguide (31) of the second multimode MZI switch module (3) through the connecting waveguide, and since the phase difference of the two arms of the second multimode MZI is π, the optical signal is output from the fourth waveguide (34), i.e., C=1.

[0049] The optical half-adder structure of the present application combines wavelength and mode structures to realize the function of a half-adder. In this design, the input addends A and B are input through electrical signals of the control modulation mechanism, and the output signals include the half-sum 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 application realizes this truth table. Existing optical logic devices mostly rely on single-dimensional control of wavelength or mode, while the optical half adder provided by the application realizes efficient control and complex logic operation of optical signals by fusing the two dimensions of wavelength and mode. This design is an innovative attempt in the field of optical logic devices, and its technical advantages mainly include:

[0052] 1. Dual-dimension control: The optical half adder can simultaneously control optical signals in both wavelength and mode dimensions, which greatly improves the flexibility and efficiency of optical signal processing.

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

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

[0055] The above describes the preferred embodiments of the application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the existing technology according to the concept of the application shall be within the protection scope determined by the claims.

Claims

1. An optical half adder, characterized in that: The invention 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; 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), wherein the first waveguide (11) is connected to the second waveguide (12), and 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, 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 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 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 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 the input end of the mode conversion module (35), the second waveguide (32) is connected to the output end of the mode conversion module (35), the third waveguide (33) is connected to the input end of the mode conversion module (35), and the fourth waveguide (34) is connected to the output end of the mode conversion module (35); the second waveguide (12) of the microring resonator module (1) is connected to the first multimode MZI switch The first waveguide (21) of the module (2) is connected; 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); 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); the microring resonator module (1) further includes a first modulation mechanism (01), the first multimode MZI switch module (2) further includes a second modulation mechanism (02), and the second multimode MZI switch module (3) further includes a third modulation mechanism (03); 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 The input-end mode converter waveguide module (255) is connected; 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 second modulation mechanism (02) is used to control one of the MZI transmission arms to adjust the phase difference between the two arms; The input-end mode converter waveguide module includes 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 both TE0 and TE1 modes, while the lower waveguide supports only 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. 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.

2. An optical half adder as claimed in claim 1, characterized in that: The first modulation mechanism (01), the second modulation mechanism (02), and the third modulation mechanism (03) are all based on a thermal modulation scheme, wherein a SiO2 layer is added to a silicon substrate, and then a silicon waveguide layer is added thereon, and a heating electrode is laid on top of the silicon-based optical waveguide. Then, a voltage is 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 phase difference of the MZI double arms.

3. An optical half adder as claimed in claim 2, 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 first 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.

4. An optical half adder as claimed in claim 3, 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).

5. An optical half adder as claimed in claim 4, characterized in that: The MZI transmission arm integrates a second modulation mechanism (02), which generates a phase difference between the two arms of the MZI, thereby adjusting the phase difference of the optical signals transmitted in the two arms, including two phase differences of 0 and π.

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