Photoelectric hybrid universal logic gate based on single resonant ring spectrum modulation

Abstract

The invention discloses a photoelectric hybrid universal logic gate based on single resonant ring frequency spectrum modulation, which comprises a resonant ring connected with an electric adder, the input of the electric adder is constant voltage and superposed voltage, the output of the electric adder is applied voltage, and the output of the electric adder is applied voltage. The superposed voltage is generated by performing superposition, photoelectric conversion, current limiting and voltage limiting on two input optical signals; different states of the input optical signal represent different logic gate input values; the applied voltage is used for adjusting the resonant wavelength of the resonant ring; the constant voltage is used for adjusting the initial resonant wavelength of the resonant ring; the resonant ring is coupled with a straight waveguide, when incident light in the straight waveguide is the same as the resonant wavelength of the resonant ring or corresponds to a free spectral range, no output light exists, otherwise, the output light exists, and the output light state of the straight waveguide represents a final logic gate output numerical value; different logics of the logic gate are adjusted by adjusting the constant voltage, the limit value of the current limit and the limit value of the voltage limit.

Description

Technical Field

[0001] The present invention belongs to the technical field of optoelectronic hybrid logic gate circuits, and in particular relates to an optoelectronic hybrid universal logic gate based on single resonant ring spectrum modulation. Background Art

[0002] Existing optoelectronic hybrid logic gates based on modulating the resonant ring spectrum (i.e., changing the resonant wavelength) are limited to implementing simple inverting NOT and buffered BUF logic. Alternatively, they require the use of at least three resonant rings to implement more complex two-port NOR and NAND logic. More complex logic operations require more resonant rings, resulting in a significant trade-off between logical complexity and structural complexity. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes an optoelectronic hybrid universal logic gate based on single resonant ring spectrum modulation to solve the problems existing in the above prior art.

[0004] To achieve the above objectives, the present invention provides an optoelectronic hybrid universal logic gate based on single resonant ring spectrum modulation, comprising:

[0005] A resonant ring, wherein the resonant ring is connected to an electrical adder, wherein the electrical adder inputs a constant voltage and a superimposed voltage, and outputs an applied voltage, the superimposed voltage being generated by superimposing two input optical signals, performing photoelectric conversion, current limiting, and voltage limiting; different states of the input optical signals represent different logic gate input values; and the applied voltage is used to adjust the resonant wavelength of the resonant ring;

[0006] The constant voltage is used to adjust the initial resonant wavelength of the resonant ring; the resonant ring is coupled with a straight waveguide, wherein when the incident light in the straight waveguide is the same as the resonant wavelength of the resonant ring or corresponds to the free spectrum range, there is no output light, otherwise there is output light, and the output light state of the straight waveguide represents the final logic gate output value;

[0007] By adjusting the constant voltage, the limit value of the current limit, and the limit value of the voltage limit, different logics of the logic gate can be adjusted.

[0008] Optionally, adjusting the different logics of the logic gates also includes:

[0009] The electrical adder is connected to a limiting circuit, wherein the limiting circuit includes an undercurrent protection circuit, a transimpedance amplifier, and an overvoltage lockout circuit connected in sequence, wherein the undercurrent protection circuit is used to set and perform current limiting on the converted electrical signal according to the maximum current output value of the current limit, and the overvoltage lockout circuit is used to set and perform voltage limiting on the converted electrical signal according to the maximum voltage output value of the current limit.

[0010] Optionally, adjusting the different logics of the logic gates also includes:

[0011] The limiting circuit is connected to a Y-beam splitter via a photoelectric converter, wherein two input optical signals are inputted respectively through the two input ports of the Y-beam splitter, and the input optical signals are superimposed, and the superimposed optical signals are photoelectrically converted by the photoelectric converter.

[0012] Optionally, adjusting the different logics of the logic gates also includes:

[0013] Grating couplers are provided on the input and output ports of the Y beam splitter and the straight waveguide.

[0014] Optionally, adjusting the different logics of the logic gates also includes:

[0015] The resonant ring comprises a curved waveguide and electrodes, wherein the electrodes are arranged on both sides of the curved waveguide; a PN junction is injected into the middle position of the curved waveguide.

[0016] Optionally, adjusting the different logics of the logic gates also includes:

[0017] The wavelength of the input optical signal is the same as the wavelength of the incident light. When an input optical signal is input into the Y-splitter, it indicates that the logic gate input value is 1. When no input optical signal is input into the Y-splitter, it indicates that the logic gate input value is 0. Correspondingly, when there is output light at the output port of the straight waveguide, it indicates that the logic gate output value is 1, otherwise it is 0.

[0018] Optionally, adjusting the different logics of the logic gates also includes:

[0019] The initial resonant wavelength includes a first resonant wavelength and a second resonant wavelength, wherein the first resonant wavelength is the same as the wavelength of the incident light, the second resonant wavelength is the difference between the first resonant wavelength and an offset, the offset is the offset of the resonant wavelength under the control of an applied voltage corresponding to an input light signal when the initial resonant wavelength is the first resonant wavelength, the free spectral range (FSR) of the resonant ring is equal to the two offsets, and the initial resonant wavelength is the resonant wavelength of the resonant ring when only a constant voltage is applied to the resonant ring.

[0020] Optionally, adjusting the different logics of the logic gates also includes:

[0021] Adjustments to different logic gates include:

[0022] The initial resonance wavelength is sequentially set to the first resonance wavelength and the second resonance wavelength to implement exclusive-OR logic and exclusive-OR logic.

[0023] Optionally, adjusting the different logics of the logic gates also includes:

[0024] Adjusting the different logics of the logic gates also includes:

[0025] The initial resonance wavelength is set to the first resonance wavelength, and the limit value of the voltage limit is adjusted so that the superimposed voltage does not exceed the voltage threshold to implement the OR logic;

[0026] On the basis of realizing OR logic, the limit value of current limit is adjusted so that when the current does not exceed the current threshold, the superimposed voltage is 0, thereby realizing AND logic;

[0027] The voltage threshold is the value of the sum of the superimposed voltages corresponding to the two input optical signals, and the current threshold is the value of the sum of the current values ​​after photoelectric conversion corresponding to the two input optical signals.

[0028] Optionally, adjusting the different logics of the logic gates also includes:

[0029] The initial resonant wavelength is set to the second resonant wavelength, and the limit value of the voltage limit is adjusted so that the superimposed voltage does not exceed the voltage threshold, so as to realize the NOR logic;

[0030] On the basis of realizing the OR-NOT logic, the limit value of the current limit is adjusted so that when the current does not exceed the current threshold, the superimposed voltage is 0, thereby realizing the AND-NOT logic.

[0031] Compared with the prior art, the present invention has the following advantages and technical effects:

[0032] The superimposed signals of multiple optical ports are applied to a single resonant ring using operations such as photoelectric conversion to control the resonant wavelength of the resonant ring to implement various logics. The present invention breaks through the contradiction between logic and structural complexity in the prior art, and implements two-port AND, NAND, OR, NOR, XOR and XNOR logic on a single resonant ring, and by changing the external constant voltage CV and the input threshold I of the transimpedance amplifier TIA, the two-port AND, NAND, OR, NOR, XOR and XNOR logic are realized. th and maximum output V max It can realize the conversion between logics. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0034] Figure 1 Schematic diagram of a single resonant ring optoelectronic hybrid universal logic gate according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of a cross-sectional structure of a resonant ring according to an embodiment of the present invention;

[0036] Figure 3 Schematic diagram of simulation results of an XOR gate and an XOR gate according to an embodiment of the present invention;

[0037] Figure 4 Schematic diagram of simulation results of a single resonant ring full adder according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0040] The present invention provides an optoelectronic hybrid universal logic gate based on spectrum modulation of a single resonant ring. It takes multiple optical ports to be superimposed as inputs. At this time, different input states will superimpose different light intensity values. By using operations such as photoelectric conversion, input threshold judgment, transimpedance amplification and output limiting, it can be converted into a discrete voltage signal and applied to the resonant ring. Therefore, different input states will cause different degrees of offset of the resonance peak, thereby generating different output states in the output waveguide. In addition, the constant voltage CV value is adjusted to change the initial state of the resonant ring. By reasonably designing the constant voltage CV, input threshold I th and maximum output V max The value of can greatly enrich the types of digital logic that can be realized by a single resonant ring.

[0041] The above technical solution is described in detail.

[0042] The present invention provides an optoelectronic hybrid universal logic gate based on single resonant ring spectrum modulation, comprising a Y-beam splitter, a photodetector, an undercurrent protection circuit, a transimpedance amplifier, an overvoltage lockout circuit, an electrical adder, a resonant ring, and a straight waveguide;

[0043] A first optical signal and a second optical signal are input through a Y-beam splitter and superimposed. A photodetector is provided at the output of the Y-beam splitter, which converts the superimposed optical signal into an electrical signal. Following the photodetector, an undercurrent protection circuit, a transimpedance amplifier, and an overvoltage lockout circuit are sequentially connected to provide undercurrent protection, signal amplification, and output limiting for the electrical signal. The overvoltage lockout circuit is connected to an electrical adder, which adds the output limited electrical signal with a constant voltage to form an applied electrical signal. The electrical adder is connected to a resonant ring, which adjusts the state of the resonant ring (whether the resonant wavelength is shifted) based on the applied electrical signal. Light is incident from the input end of a straight waveguide, enters the ring cavity through coupling between the straight waveguide and the microring, oscillates in the ring cavity, and then enters the output end through coupling between the curved waveguide and the straight waveguide. At the resonant wavelength, the transmitted light field in the straight waveguide and the light field coupled into the straight waveguide by the microring form destructive interference, resulting in no light being emitted, thus achieving wavelength selection. The incident light is modulated by adjusting the resonant ring of the resonant wavelength to output the corresponding optical signal (the presence or absence of the optical signal) at the output end of the straight waveguide, and the corresponding logic gate output result is determined by the output optical signal.

[0044] In the above content, the logic of the above logic gate is adjusted by adjusting the constant voltage applied by the undercurrent protection circuit, the overvoltage lockout circuit and the electrical adder, wherein the constant voltage applied by the electrical adder is used to initialize the resonant wavelength of the resonant ring, and the undercurrent protection circuit and the overvoltage lockout circuit are used to adjust the intensity of the superimposed electrical signal to achieve analysis under specific logic.

[0045] In the above-mentioned initialization resonance wavelength, the resonance wavelength of the resonance ring is initialized by a constant voltage. When the applied electrical signal is a constant voltage, the resonance wavelength of the resonance ring is constant. When the applied electrical signal is adjusted according to the input light on the basis of the constant voltage, the resonance wavelength of the resonance ring will shift.

[0046] The radius of the resonant ring is adjusted, and then the free spectrum range (FSR) of the resonant ring is adjusted, so that in addition to the same wavelength value of the incident light, no optical signal is output at the wavelength adjusted under the free spectrum range.

[0047] The resonant ring structure includes a doped curved waveguide and an electrode, wherein the electrode is arranged on the curved waveguide;

[0048] The cross-sectional structure of the resonant ring includes a waveguide, electrodes at each end, and a P-type doped region (P-terminal) and an N-type doped region (N-terminal) separated by the waveguide material in the middle of the waveguide. In practical applications, it is necessary to ensure that the N-terminal is connected to a high voltage and the P-terminal is connected to a low voltage (i.e., the PN junction is reverse biased, with the drift current flowing from the N-terminal to the P-terminal). Applying different reverse bias voltages to the PN junction can change the carrier concentration distribution within the curved waveguide, thereby changing the refractive index of the curved waveguide, ultimately causing a shift in the resonant wavelength of the resonant ring.

[0049] The initial resonant wavelength (i.e., when no light is incident) can be adjusted by varying the bias voltage CV applied to the resonant ring. Specifically, a constant voltage source is connected to both ends of the upper electrode of the resonant ring. When no light is incident, adjusting the voltage of the constant voltage source can change the initial resonant wavelength, thus initializing the resonant wavelength.

[0050] The curved waveguide of the resonant ring is placed on a straight waveguide, and the two are only optically coupled and not directly connected. The straight waveguide transmits the incident light. Depending on the state of the resonant ring, when the resonant wavelength of the resonant ring matches the wavelength of the incident light, the resonant ring resonates with the incident light in the straight waveguide, coupling the incident light into the curved waveguide, and no output light is generated. When the resonant wavelength of the resonant ring differs from the wavelength of the incident light, output light is generated.

[0051] Specifically, the distance between the curved waveguide and the straight waveguide is very close (typically within a few hundred nanometers) but not in direct contact. In this case, light can propagate in the straight waveguide and generate a decaying electromagnetic field that extends into space, the so-called "evanescent field." If the curved waveguides are close enough, this evanescent field can interact with the ring waveguide mode and transfer some of the light energy to the curved waveguide. For this coupling to be effective, the wavelength of the incident light needs to meet the resonance condition of the resonant ring, which means that only light of a specific wavelength (frequency) can be effectively coupled from the straight waveguide into the curved waveguide and circulate within it. In other words, when the wavelength of the incident light is the same as the resonant wavelength of the resonant ring, most of the input light is efficiently coupled into the curved waveguide. Due to the high Q factor (high quality factor), this light is confined within the resonant ring and undergoes multiple round-trip reflections, making it difficult to escape. As a result, no light is observed to emerge from the output straight waveguide. Otherwise, only a small portion of the incident light is coupled into the curved waveguide, and the majority of the light emerges from the output straight waveguide.

[0052] The above-mentioned resonant ring and straight waveguide constitute a structure of a microring resonator. The operating principle and other related contents of the microring resonator are well known to those skilled in the art and will not be elaborated here.

[0053] The radius of the resonant ring is adjusted, and then the free spectrum range (FSR) of the resonant ring is adjusted, so that in addition to the same wavelength value of the incident light, no optical signal is output at the wavelength adjusted under the free spectrum range.

[0054] The incident light of the resonant ring has the same wavelength as the two optical signals of the Y beam splitter. When an optical signal is input to the Y beam splitter, the corresponding input of the optical signal is considered to be 1. If no optical signal is input to the Y beam splitter, the corresponding input is 0.

[0055] Grating couplers are provided on each port of the Y-beam splitter and the straight waveguide to achieve coupling of light between the free space and the on-chip waveguide.

[0056] Adjustment of the constant voltage applied by undercurrent protection circuit, overvoltage lockout circuit and electrical adder to realize AND, NAND, OR, NOR, XOR and XNOR logic;

[0057] The resonant wavelength of the resonant ring is initialized by a constant voltage, and the initialized resonant wavelengths include a first resonant wavelength and a second resonant wavelength. The resonant wavelength of the first resonant ring is initialized by a constant voltage, and the initialized resonant wavelengths include a first resonant wavelength, a second resonant wavelength, and a third resonant wavelength. The first resonant wavelength is the wavelength of incident light corresponding to the straight waveguide of the resonant ring. The second resonant wavelength is the difference between the first resonant wavelength and an offset. The offset is the offset of the resonant wavelength when one of the first light signal and the second light signal changes to 1 when the initial resonant wavelength is the first resonant wavelength. Under the adjustment of the offset, the initial second resonant wavelength can be adjusted to the first resonant wavelength when one light signal changes.

[0058] By initializing the resonant wavelength of the resonant ring to the first resonant wavelength and the second resonant wavelength, exclusive OR (XOR) and exclusive NOR (XNOR) logic are realized;

[0059] By initializing the resonant ring's resonant wavelength to the first resonant wavelength and setting the corresponding maximum output limit through the overvoltage lockout circuit, the voltage increase corresponding to the input optical signal is limited. The resonant ring is also in an offset resonance state, thereby implementing OR logic. The maximum output limit can be set to the output value of the transimpedance amplifier corresponding to when one optical signal is 1 and the other optical signal is 0. In this way, when both outputs are 1, the resonant ring's resonant wavelength does not change, and the output is the same as when the same optical signal is 1 and the other optical signal is 0.

[0060] Based on the implementation of OR logic, the corresponding current threshold is set through the undercurrent protection circuit to keep the resonant ring in the resonant state, realizing AND logic. The current threshold needs to be greater than the current value output by the photodetector when one optical signal is 1 and the other optical signal is 0, and less than or equal to the current value output by the photodetector when both optical signals are 1. In this way, when one optical signal is 1 and the other optical signal is 0, the photocurrent is insufficient to drive the subsequent transimpedance amplifier. The resonant wavelength of the resonant ring remains the same as the initial state (both optical signals are 0), and the output also remains consistent with the initial state.

[0061] By initializing the resonant wavelength of the resonant ring to the second resonant wavelength and setting the corresponding maximum output upper limit through the overvoltage lockout circuit, it is possible to ensure that when the current value corresponding to the input optical signal increases, the resonant ring is also in a resonant state, realizing the NOR gate (NOR) logic.

[0062] Based on the NOR logic, the corresponding current threshold is set through the undercurrent protection circuit to limit the current value corresponding to the input optical signal. The resonant ring is also in a resonant state to realize the NAND logic.

[0063] The above scheme is described with reference to the accompanying drawings:

[0064] like Figure 1 As shown, the present invention comprises three parts: an optical path, a circuit, and a photoelectric conversion. The optical path comprises a Y-beam splitter for superimposing input optical signals and outputting the superimposed optical signal p, as well as a resonant ring and its input and output straight waveguides for modulating the optical signal. The circuit comprises an undercurrent protection UCP circuit for selectively exciting the amplifier circuit (when the current i output by the photodetector is less than the current threshold I th When the transimpedance amplifier is disconnected), a transimpedance amplifier TIA is used to amplify the electrical signal (when the voltage v output by the transimpedance amplifier is greater than the voltage threshold Vmax, it is adjusted to the voltage threshold Vmax), an overvoltage lockout OVLO circuit is used to limit the output, and a constant voltage CV generator (constant voltage source, the output voltage values ​​are v c ) is used to adjust the initial state of the resonant ring, and an electrical adder ⊕ is used to superimpose (voltage summation) the total voltage v applied to the resonant ring sum The photoelectric conversion is realized between the two through a photodetector PD. The resonant ring of the optical path is composed of doped curved waveguide and electrodes, such as Figure 2 In addition, each port of the Y-beam splitter and the straight waveguide is connected to a grating coupler to achieve coupling between the free space and the on-chip waveguide.

[0065] The materials used for the optical path (straight waveguide, Y-beam splitter, grating coupler, and curved waveguide of the resonant ring) in the present invention need to ensure that light has very low transmission loss in the communication band of 1550nm, such as single-crystal silicon thin film on insulator SOI;

[0066] The electrodes of the resonant ring need to be made of metal materials with low resistance and compatible with silicon photonics processes, such as aluminum (Al) or copper (Cu).

[0067] The curved waveguide of the resonant ring needs to be doped to form a PN junction to achieve electro-optical modulation. Boron B and phosphorus P can be used as doping materials.

[0068] The material used in the photodetector (PD) must ensure that the effective wavelength covers the communication band, such as indium gallium arsenide (InGaAs).

[0069] The circuit part (transimpedance amplifier TIA, constant voltage CV output circuit, undercurrent protection UCP circuit and overvoltage lockout OVLO circuit) can be implemented using silicon-based CMOS technology.

[0070] The process flow for preparing the above logic gate of the present invention is as follows:

[0071] 1) Preparation of single crystal silicon-on-insulator (SOI) thin film substrate;

[0072] 2) Produce patterns of straight waveguide, Y-beam splitter, grating coupler and resonant ring curved waveguide parts through electron beam exposure (EBL) and reactive ion etching (RIE) processes;

[0073] 3) Forming a PN junction in the resonant ring curved waveguide through two localized ion implantation (IMP) processes;

[0074] 4) Depositing an aluminum film by magnetron sputtering or electron beam evaporation, transferring the pattern using photolithography, and forming the pattern of the resonant ring electrode portion by dry etching.

[0075] 5) The obtained optical path is interconnected with the circuit prepared by CMOS process through photodetectors, optical fibers and probes

[0076] The control principle for the above logic gate is as follows:

[0077] The present invention utilizes the initial resonance wavelength of the resonant ring (i.e., the resonance wavelength when only a constant voltage CV is applied to the resonant ring) and the circuit input threshold I th and maximum output V maxWith the rational design, various digital logics can be realized on a single resonant ring. A(B)=0(1) indicates that there is no light incident on the A(B) port (light with a power of 1mW is incident); C=0(1) indicates that there is no light output from the C port (light with a power of 1mW is output); and there is always light with a power of 1mW incident on the Supply Light port. The wavelength of all incident light is λ0, and Δλ indicates the offset of the resonant wavelength when A and B are equal to 1, λ1=λ0-Δλ. Therefore, for a resonant ring with a resonant wavelength of λ1, its resonant wavelength will shift to λ0 when one of A and B is equal to 1. Similarly, for a resonant ring with a resonant wavelength of λ2, its resonant wavelength will shift to λ0 only when A and B are 1 at the same time. When the resonant wavelength of the resonant ring is λ0, the transmission light field Supply Light in the straight waveguide forms destructive interference with the light field coupled from the microring to the straight waveguide, and no light will be output at this time.

[0078] By adjusting the radius of the resonant ring, the free spectral range (FSR) of the resonant ring is equal to 2Δλ, so λ2 is also the resonant wavelength of the resonant ring. The radius of the resonant ring remains unchanged in each logic, and the initial resonant wavelength is adjusted using a constant voltage CV. Specifically, a constant voltage source is connected to both ends of the electrode on the resonant ring. When there is no light incident, the voltage value of the constant voltage source can be adjusted to change the initial resonant wavelength, thereby initializing the resonant wavelength.

[0079] For each two-port digital logic, specifically:

[0080] 1) XOR gate: The initial resonant wavelength of the resonant ring is λ0. When A and B are both 0, the resonant ring is in a resonant state, C=0; when one of A and B is 1, the resonant ring is in a non-resonant state, C=1; when A and B are both 1, the resonant ring returns to a resonant state, C=0, so it is an XOR gate logic.

[0081] 2) XNOR gate: The initial resonant wavelength of the resonant ring is λ1. When A and B are both 0, the resonant ring is not in a resonant state, C=1; when one of A and B is equal to 1, the resonant ring is exactly in a resonant state, C=0; when A and B are both 1, the resonant ring deviates from the resonant state again, C=1, so it is an XNOR gate logic.

[0082] 3) OR gate: The initial resonant wavelength of the resonant ring is λ0. When A and B are both 0, the resonant ring is in a resonant state, C=0; when one of A and B is 1, the resonant ring deviates from the resonant state, C=1; when A and B are both 1, the maximum output voltage is set so that the resonant ring still deviates from the resonant state, C=1, so it is an OR gate logic.

[0083] 4) AND gate: Based on the OR gate, when one of A and B is 1, the generated photocurrent is less than the threshold. At this time, the resonant ring is still in the resonant state, C = 0, and the logic remains unchanged in other cases, so it is the AND gate logic.

[0084] 5) NOR gate: The initial resonant wavelength of the resonant ring is λ1. When A and B are both 0, the resonant ring is not in a resonant state, C=1; when one of A and B is 1, the resonant ring deviates to a resonant state, C=0; when A and B are both 1, the maximum output voltage is set so that the resonant ring is still in a resonant state, C=0, so it is a NOR gate logic.

[0085] 6) NAND gate: Based on the NOR gate, when one of A and B is 1, the generated photocurrent is less than the threshold. At this time, the resonant ring is still off the resonance state, C = 1, and the logic remains unchanged in other cases. Therefore, it is NAND gate logic.

[0086] The simulation results of XOR gate and XNOR gate are as follows: Figure 3 As shown in the figure, 0 to 0.2 μs corresponds to the case where both A and B are 0, and every 0.2 μs, one input terminal is set to 1. In fact, other logic gates are implemented based on the XOR gate and XNOR gate through the circuit threshold and limiter design.

[0087] The present invention can be used for optical logic operations and digital optical path design. In addition to basic two-port logic gates, it can also be further expanded to digital logic devices such as single resonant ring full adders.

[0088] The gain of the transimpedance amplifier TIA of various optical logic gates in the present invention is fixed at 2.4kOhms, the radius of the resonant ring is fixed at 5mm, and the initial state of the resonant ring is changed by adjusting the constant voltage CV on the resonant ring, and the different input thresholds I are used. th and maximum output V max Then, various logics are realized, and the specific values ​​are shown in Table 1. Table 1 shows the example values ​​of the reconstruction method of the single resonant ring optoelectronic hybrid universal logic gate.

[0089] Table 1

[0090] variable XOR gate XNOR Gate OR Gate AND Gate NOR gate NAND gate CV(V) 5.1 7.5 5.1 5.1 7.5 7.5 <![CDATA[I th (mA)]]> 0 0 0 1.5 0 1.5 <![CDATA[V max (V)]]> 12.3 12.3 7.5 7.5 9.9 9.9

[0091] This solution can be used to implement a variety of optoelectronic hybrid logic gates on a single resonant ring, and each logic gate can be reconfigured. Although the present invention emphasizes the implementation of various digital logics by a single resonant ring, this does not mean that the logic gates designed with this invention cannot be interconnected. For example, cascading two XOR logics can realize the output logic of a one-bit full adder. At the same time, the present invention has high process tolerance and robustness. Even if the initial resonant wavelength of the resonant ring deviates due to process errors, it can be calibrated by adjusting the output voltage of the constant voltage CV generator and the transimpedance gain of the transimpedance amplifier TIA.

[0092] In addition, this solution can be further extended to use a single resonant ring to implement more complex digital logic. Taking the full adder as an example, it is only necessary to change the Y-beam splitter into a "trident" structure to adapt to the situation of three inputs. For the output end S, the initial resonant wavelength λ0, when A, B and Ci are all 0, the resonant ring is in a resonant state, S = 0; when there is only one of A, B and Ci is 1, the resonant ring is in a non-resonant state, S = 1; when there are only two of A, B and Ci is 1, the resonant ring is in a resonant state, S = 0; when A, B and Ci are all 1, the resonant ring is in a non-resonant state, S = 1, thereby realizing the logic corresponding to the output end; for the carry end Co, it is necessary to set the input threshold so that when there is only one of A, B and Ci is 1, the resonant ring is still in a resonant state, Co = 0; at the same time, set the maximum output voltage so that when there are at least two 1s in A, B and Ci, the resonant ring is out of the resonant state, Co = 1. The simulation results are as follows Figure 4 As shown, 0 to 0.2μs corresponds to the situation where both A and B are 0, and one more input terminal is 1 every 0.2μs.

[0093] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An optoelectronic hybrid universal logic gate based on single resonant ring spectrum modulation, characterized in that: include: A resonant ring, wherein the resonant ring is connected to an electrical adder, wherein the electrical adder inputs a constant voltage and a superimposed voltage, and outputs an applied voltage, the superimposed voltage being generated by superimposing two input optical signals, performing photoelectric conversion, current limiting, and voltage limiting; different states of the input optical signals represent different logic gate input values; and the applied voltage is used to adjust the resonant wavelength of the resonant ring; The constant voltage is used to adjust the initial resonant wavelength of the resonant ring; the resonant ring is coupled with a straight waveguide, wherein when the incident light in the straight waveguide is the same as the resonant wavelength of the resonant ring or corresponds to the free spectrum range, there is no output light, otherwise there is output light, and the output light state of the straight waveguide represents the final logic gate output value; By adjusting the constant voltage, the limit value of the current limit, and the limit value of the voltage limit, different logics of the logic gate can be adjusted.

2. The logic gate according to claim 1, wherein: The electrical adder is connected to a limiting circuit, wherein the limiting circuit includes an undercurrent protection circuit, a transimpedance amplifier, and an overvoltage lockout circuit connected in sequence, wherein the undercurrent protection circuit is used to set and perform current limiting on the converted electrical signal according to the maximum current output value of the current limit, and the overvoltage lockout circuit is used to set and perform voltage limiting on the converted electrical signal according to the maximum voltage output value of the current limit.

3. The logic gate according to claim 2, wherein: The limiting circuit is connected to a Y-beam splitter via a photoelectric converter, wherein two input optical signals are inputted respectively through the two input ports of the Y-beam splitter, and the input optical signals are superimposed, and the superimposed optical signals are photoelectrically converted by the photoelectric converter.

4. The logic gate according to claim 3, wherein: Grating couplers are provided on the input and output ports of the Y beam splitter and the straight waveguide.

5. The logic gate according to claim 1, wherein: The resonant ring comprises a curved waveguide and electrodes, wherein the electrodes are arranged on both sides of the curved waveguide; a PN junction is injected into the middle position of the curved waveguide.

6. The logic gate according to claim 1, wherein: The wavelength of the input optical signal is the same as the wavelength of the incident light. When an input optical signal is input into the Y-splitter, it indicates that the logic gate input value is 1. When no input optical signal is input into the Y-splitter, it indicates that the logic gate input value is 0. Correspondingly, when there is output light at the output port of the straight waveguide, it indicates that the logic gate output value is 1, otherwise it is 0.

7. The logic gate according to claim 1, wherein: The initial resonant wavelength includes a first resonant wavelength and a second resonant wavelength, wherein the first resonant wavelength is the same as the wavelength of the incident light, the second resonant wavelength is the difference between the first resonant wavelength and an offset, the offset is the offset of the resonant wavelength under the control of an applied voltage corresponding to an input light signal when the initial resonant wavelength is the first resonant wavelength, the free spectral range (FSR) of the resonant ring is equal to the two offsets, and the initial resonant wavelength is the resonant wavelength of the resonant ring when only a constant voltage is applied to the resonant ring.

8. The logic gate according to claim 7, wherein: Adjustments to different logic gates include: The initial resonance wavelength is sequentially set to the first resonance wavelength and the second resonance wavelength to implement exclusive-OR logic and exclusive-OR logic.

9. The logic gate according to claim 7, wherein: Adjusting the different logics of the logic gates also includes: The initial resonance wavelength is set to the first resonance wavelength, and the limit value of the voltage limit is adjusted so that the superimposed voltage does not exceed the voltage threshold to implement the OR logic; On the basis of realizing OR logic, the limit value of current limit is adjusted so that when the current does not exceed the current threshold, the superimposed voltage is 0, thereby realizing AND logic; The voltage threshold is the value of the sum of the superimposed voltages corresponding to the two input optical signals, and the current threshold is the value of the sum of the current values ​​after photoelectric conversion corresponding to the two input optical signals.

10. The logic gate according to claim 9, wherein: Adjusting the different logics of the logic gates also includes: The initial resonant wavelength is set to the second resonant wavelength, and the limit value of the voltage limit is adjusted so that the superimposed voltage does not exceed the voltage threshold, so as to realize the NOR logic; On the basis of realizing the OR-NOT logic, the limit value of the current limit is adjusted so that when the current does not exceed the current threshold, the superimposed voltage is 0, thereby realizing the AND-NOT logic.

Images