A device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA

Abstract

The present invention relates to a device for realizing non - linear neural computation based on double - wavelength optical pulse injection into an FP - SA, comprising: an optical wave generation module, a coupling module, an optical circulator, and an FP - SA; wherein, the optical wave generation module is used to generate two incoherent optical carriers with different wavelengths, and form two incoherent optical pulse signals according to two electrical pulse signals generated by an arbitrary waveform generator in the optical wave generation module; the coupling module is used to couple the two incoherent optical pulse signals to obtain a combined first optical pulse signal; the first optical pulse signal enters the FP - SA through the optical circulator; the FP - SA is used to perform non - linear response on the first optical pulse signal to realize non - linear computation, and a second optical pulse signal representing the result of non - linear computation is output externally through the optical circulator. The present invention can alleviate the optical power requirement of a coherent - wavelength optical injection light source, and can be combined with a large - scale synaptic array to realize a large - scale incoherent photon pulse neural network.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical computing, and particularly relates to a device for realizing nonlinear neural computing based on dual-wavelength optical pulse injection into an FP-SA. Background Art

[0002] Neuromorphic computing based on a non-von Neumann architecture draws inspiration directly from the way biological nervous systems process information. It overcomes the energy and speed limitations brought by the von Neumann architecture. Recently, novel photonic methods applied to neuromorphic systems have attracted increasing attention due to their inherent nonlinearity, low latency, relatively high possible bandwidth, and low electromagnetic interference. Therefore, the academic and industrial communities have been committed to developing photonic neuromorphic computing, including photonic pulse neural networks (PSNNs), ultrafast simulations of neuron-like behavior, and the simulation of synaptic learning capabilities and weighting functions.

[0003] Pulse neural networks take into account the influence of time information and provide a more biologically meaningful method for realizing neuromorphic computing. As one of the important information functional units in PSNNs, photonic pulse neurons are responsible for information encoding and processing and are crucial for the nonlinear computing of the network. Therefore, the nonlinear computing of photonic pulse neurons, including thresholds, time integration, and refractory periods, has attracted great attention.

[0004] In recent years, photonic pulse neuron models based on different systems have emerged in an endless stream, including phase change materials (PCMs), resonant tunneling diodes, and different types of semiconductor lasers. These photonic spiking neuron models exhibit neuron-like dynamics when receiving external optical injection. However, they have limitations in some aspects. For example, the lack of a time accumulation function in PCM-based pulse neurons results in certain limitations in pulse processing. The output power of microcolumn laser neurons is relatively low, and additional amplification may be required to compensate for losses when applied to multi-layer or deep optical pulse neural networks. Vertical-cavity surface-emitting lasers with embedded saturable absorbers (VCSEL-SAs) pulse neurons are difficult to fabricate in practice due to manufacturing process limitations. Photonic pulse neurons based on integrated distributed feedback semiconductor lasers require optoelectronic conversion, which increases the complexity and power consumption of the system.

[0005] In addition, external optical injection is used to simulate the presynaptic signal of neurons. For coherent wavelength optical injection, the presynaptic signal comes from a single light source. As the network scale expands, the demand for optical power increases, making it impossible to achieve large-scale networks. Summary of the Invention

[0006] To solve the above problems existing in the prior art, the present invention provides a device for realizing non-linear neural computation based on dual-wavelength optical pulse injection into an FP-SA. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0007] The present invention provides a device for realizing non-linear neural computation based on dual-wavelength optical pulse injection into an FP-SA, including: an optical wave generation module, a coupling module, an optical circulator, and an FP-SA; wherein,

[0008] The optical wave generation module is used to generate two incoherent optical carriers with different wavelengths, and form two incoherent optical pulse signals according to two electrical pulse signals generated by an arbitrary waveform generator in the optical wave generation module;

[0009] The coupling module is used to couple the two incoherent optical pulse signals to obtain a combined first optical pulse signal;

[0010] The first optical pulse signal enters the FP-SA through the optical circulator;

[0011] The FP-SA is used to perform non-linear response on the first optical pulse signal to realize non-linear computation, and a second optical pulse signal characterizing the non-linear computation result is output externally through the optical circulator.

[0012] In an embodiment of the present invention, the optical wave generation module includes the arbitrary waveform generator, a tunable laser, a first polarization controller, a second polarization controller, and two MZMs, wherein,

[0013] The arbitrary waveform generator is used to generate two electrical pulse signals;

[0014] The tunable laser is used to generate two incoherent optical carriers with different wavelengths;

[0015] The two incoherent optical carriers with different wavelengths enter the corresponding MZMs after passing through the corresponding first polarization controller and second polarization controller;

[0016] The two MZMs are used to load the input corresponding two electrical pulse signals onto the corresponding incoherent optical carriers to form two incoherent optical pulse signals.

[0017] In an embodiment of the present invention, the coupling module includes an adjustable optical delay line, an optical coupler, an adjustable optical attenuator, and a third polarization controller, wherein,

[0018] The adjustable optical delay line is connected to any one of the MZMs, and the adjustable optical delay line is used to compensate for the delay between the two incoherent optical pulse signals;

[0019] The optical coupler is connected to the tunable optical delay line. The optical coupler is used to couple two incoherent optical pulse signals after delay compensation into one optical signal to obtain the first optical pulse signal;

[0020] The first optical pulse signal passes through the tunable optical attenuator and the third polarization controller in sequence and then enters the gain region of the FP-SA through the optical circulator;

[0021] The tunable optical attenuator is used to adjust the optical power of the first optical pulse signal;

[0022] The third polarization controller is used to adjust the polarization state of the first optical pulse signal.

[0023] In an embodiment of the present invention, the gain region current applied to the gain region of the FP-SA does not exceed the Q-switching pulse threshold corresponding to the reverse bias voltage applied to the saturated absorption region of the FP-SA, and can prompt the FP-SA to operate in the excited state;

[0024] The Q-switching pulse threshold is defined as: under the condition of no external optical input and a given reverse bias voltage, the minimum gain region current at which the FP-SA is excited to the Q-switching pulse state.

[0025] In an embodiment of the present invention, the value range of the reverse bias voltage is -6V to 0V, and the value range of the gain region current is 0 to 120 mA.

[0026] In an embodiment of the present invention, the device further includes a laser diode controller. The laser diode controller is used to apply a gain region current to the FP-SA and simultaneously control the operating temperature of the FP-SA by using the laser diode controller.

[0027] In an embodiment of the present invention, the wavelengths of the two incoherent optical pulse signals match two different longitudinal modes of the FP-SA.

[0028] In an embodiment of the present invention, there is a wavelength difference between the wavelengths of the two incoherent optical pulse signals and the central operating wavelength of the FP-SA, and the signs of the two wavelength differences are the same.

[0029] In an embodiment of the present invention, the optical wave generation module further includes two radio frequency amplifiers. The radio frequency amplifiers are used to amplify the corresponding electrical pulse signals to drive the corresponding MZMs.

[0030] The present invention provides a chip for realizing non-linear neural computing based on dual-wavelength optical pulse injection into an FP-SA, including the device for realizing non-linear neural computing based on dual-wavelength optical pulse injection into an FP-SA described in any one of the above embodiments.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA of the present invention can achieve nonlinear neural computation through two incoherent optical pulse signals, can alleviate the optical power requirement of the coherent wavelength optical injection light source, and can be combined with a large-scale synaptic array to realize a large-scale incoherent photonic pulse neural network.

[0033] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. Description of the Drawings

[0034] Figure 1 is a structural block diagram of a device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA provided by an embodiment of the present invention;

[0035] Figure 2 is a structural schematic diagram of a device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA provided by an embodiment of the present invention;

[0036] Figure 3 is a spectrogram when FP-SA operates freely;

[0037] Figure 4 shows the experimental platform built when verifying the performance of the device provided by an embodiment of the present invention;

[0038] Figure 5 shows the verification result that the photonic pulse neuron realized based on the device provided by an embodiment of the present invention has a threshold characteristic;

[0039] Figure 6 shows the verification result that the photonic pulse neuron realized based on the device provided by an embodiment of the present invention has a time-domain accumulation characteristic;

[0040] Figure 7 shows the verification result that the photonic pulse neuron realized based on the device provided by an embodiment of the present invention has a refractory period characteristic. Detailed Embodiments

[0041] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and specific embodiments, details a device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA proposed according to the present invention.

[0042] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the predetermined purpose can be obtained. However, the attached drawings are only for reference and illustration, and are not used to limit the technical solutions of the present invention.

[0043] Embodiment 1

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 which is a structural block diagram of a device for realizing non-linear neural computing based on dual-wavelength optical pulse injection into FP-SA provided by an embodiment of the present invention; Figure 2 which is a structural schematic diagram of a device for realizing non-linear neural computing based on dual-wavelength optical pulse injection into FP-SA provided by an embodiment of the present invention. As shown in the figure, the device includes an optical wave generation module, a coupling module, an optical circulator CIRC and an FP-SA. Among them, the FP-SA is a two-section Fabry-Perot laser formed by introducing a saturable absorber (SA) into a Fabry-Perot (FP) cavity, simply referred to as FP-SA.

[0045] Among them, the optical wave generation module is used to generate two incoherent optical carriers with different wavelengths, and form two incoherent optical pulse signals according to two electrical pulse signals generated by an arbitrary waveform generator AWG in the optical wave generation module.

[0046] As Figure 2 shown, the optical wave generation module includes an arbitrary waveform generator AWG, tunable lasers (TL1 and TL2), a first polarization controller PC1, a second polarization controller PC2 and two MZMs (MZM1 and MZM2). Among them, the arbitrary waveform generator AWG is used to generate two electrical pulse signals; the tunable lasers TL1 / TL2 are used to generate two incoherent optical carriers with different wavelengths; the two incoherent optical carriers with different wavelengths enter the corresponding MZMs (MZM1 and MZM2) after passing through the corresponding first polarization controller PC1 and second polarization controller PC2; the two MZMs are used to load the input corresponding two electrical pulse signals onto the corresponding incoherent optical carriers to form two incoherent optical pulse signals.

[0047] Optionally, when the power of the electrical pulse signal is low, the optical wave generation module further includes two radio frequency amplifiers (RFPA1 and RF PA2), and the radio frequency amplifiers are used to amplify the corresponding electrical pulse signals to drive the corresponding MZMs (MZM1 and MZM2).

[0048] Continue to refer to Figure 1As shown, the coupling module is used to couple two incoherent optical pulse signals to obtain a combined first optical pulse signal.

[0049] As Figure 2 shown, the coupling module includes a variable optical delay line (VODL), an optical coupler (OC1), a variable optical attenuator (VOA), and a third polarization controller (PC3).

[0050] Among them, the variable optical delay line (VODL) is connected to any one of the MZMs. In this embodiment, the variable optical delay line (VODL) is connected to MZM1, and the variable optical delay line (VODL) is used to compensate for the delay between the two incoherent optical pulse signals.

[0051] The optical coupler (OC1) is connected to the variable optical delay line (VODL), and the optical coupler (OC1) is used to couple the two incoherent optical pulse signals after delay compensation into one optical signal to obtain the first optical pulse signal.

[0052] The first optical pulse signal passes through the variable optical attenuator (VOA) and the third polarization controller (PC3) in sequence and then enters the gain region of the FP-SA through the optical circulator (CIRC). Among them, the variable optical attenuator (VOA) is used to adjust the optical power of the first optical pulse signal, and the third polarization controller (PC3) is used to adjust the polarization state of the first optical pulse signal, so that the first optical pulse signal entering the FP-SA through the optical circulator (CIRC) can match the working state of the FP-SA in both optical power and polarization state.

[0053] Continue to refer to Figure 1 shown, the first optical pulse signal enters the FP-SA through the optical circulator (CIRC). Specifically, the first optical pulse signal enters the input end of the optical circulator (CIRC) and then enters the FP-SA from the output end of the optical circulator (CIRC). The optical circulator (CIRC) is a three-port device, and it also has a coupling end. In practice, this coupling end can be connected to a matching load.

[0054] The FP-SA is used to perform non-linear response on the first optical pulse signal to achieve non-linear calculation, and the second optical pulse signal representing the non-linear calculation result is output externally through the optical circulator.

[0055] In an optional embodiment, the FP-SA is a PIN structure grown based on AlGaInAs / InP materials, including a gain region and a saturable absorption region. There is an electrically isolated region between the two regions, and electrodes are respectively provided on the two regions. The electrode of the gain region is externally connected to a bias current (gain region current), and the electrode of the saturable absorption region is externally connected to a reverse bias voltage (reverse bias voltage). External light enters the laser, and laser light is generated and output externally inside the laser.

[0056] As Figure 3The spectral diagram of the FP-SA in free-running mode. This spectral diagram is obtained by conducting experiments with a chip having a saturated absorption (SA) length of 90 μm as an example. The reverse bias voltage of the FP-SA laser is fixed at 0 V, and the gain region current is increased to observe the spectrum of the FP-SA. In the spectral diagram, the horizontal axis represents the wavelength, and the vertical axis represents the output power of the FP-SA. When the gain region current of the FP-SA is 50 mA, the FP-SA laser is excited to a multi-longitudinal mode state, and the spacing between adjacent two modes is 0.23 nm.

[0057] It should be noted that in this embodiment, the wavelengths of the two incoherent optical pulse signals match two different longitudinal modes of the FP-SA. There is a wavelength difference between the wavelengths of both incoherent optical pulse signals and the central operating wavelength of the FP-SA, and the signs of the two wavelength differences are the same.

[0058] In this embodiment, the FP-SA is configured to operate below the Q-switching pulse threshold, that is, the gain region current of the FP-SA is configured below the Q-switching pulse threshold. Here, the Q-switching pulse threshold is defined as: under the condition that there is no external light input to the FP-SA and it operates at a given reverse bias voltage, the minimum gain region current at which the FP-SA is excited to the Q-switching pulse state (i.e., the self-pulsing state).

[0059] That is, in practical applications, the gain region current applied to the gain region of the FP-SA does not exceed the Q-switching pulse threshold corresponding to the reverse bias voltage applied to the saturated absorption region of the FP-SA, and it can cause the FP-SA to enter the excited state for operation. Therefore, before starting to use the FP-SA as a neuron, by testing the power and current curves of the FP-SA at different reverse bias voltages, a reverse bias voltage can be selected from them, and then based on this reverse bias voltage, the Q-switching pulse threshold can be determined, and accordingly, the gain region current of the FP-SA can be determined. Moreover, the larger the reverse bias voltage, the larger the Q-switching pulse threshold of the FP-SA.

[0060] Optionally, the value range of the reverse bias voltage is -6 V to 0 V, and the value range of the gain region current is 0 to 120 mA.

[0061] In an optional implementation manner, as Figure 2 shown, the device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into the FP-SA further includes a laser diode controller LDC. The laser diode controller LDC is used to apply a gain region current to the FP-SA and simultaneously control the operating temperature of the FP-SA by using the laser diode controller LDC. Optionally, the reverse bias voltage of the absorption region of the FP-SA is adjusted by a voltage source VS.

[0062] In the process of implementing the present invention, the inventors conducted a series of experiments to verify the performance of the photon pulse neuron implemented based on the device provided in the embodiments of the present invention. The experimental process and results are described in detail below.

[0063] Build an experimental platform, as Figure 4 shown. An arbitrary waveform generator (AWG) generates an electrical pulse signal. Tunable lasers (TL1 and TL2) provide two incoherent optical carriers with different wavelengths. After passing through polarization controllers (PC1 and PC2) respectively, the two optical carriers enter intensity modulators (MZM1 and MZM2). PC1 and PC2 can control the polarization state of the externally injected light to match the operating states of MZM1 and MZM2. The two electrical signals generated by the AWG are amplified by radio frequency power amplifiers (RF PA1 and RF PA2), and then are respectively loaded onto the optical carriers through MZM1 and MZM2. The signal after modulation by MZM1 passes through a variable optical delay line (VODL) to compensate for the delay between the two optical paths. The two optical carriers carrying different signals after MZM1 and MZM2 are coupled into one optical signal by a 50:50 optical coupler OC1, and then are injected into the gain region of the FP-SA through a variable optical attenuator (VOA), a polarization controller PC3, an optical coupler OC2, and an optical circulator CIRC. The drive current of the gain region of the FP-SA is provided by a laser diode controller (LDC), and the reverse bias voltage of the absorption region is adjusted by a voltage source (VS). The operating temperature of the FP-SA is also controlled by the laser diode controller (LDC). The power of the externally injected light into the FP-SA can be adjusted by the VOA, and the polarization controller PC3 can adjust the polarization state of the externally injected light into the FP-SA to match the FP-SA for realizing nonlinear neural computation.

[0064] For convenient measurement, the optical coupler OC2 divides the first optical pulse signal entering the FP-SA into two beams of light. One beam enters the gain region of the FP-SA through the optical circulator CIRC, and the other beam is used for power detection through an optical power meter (PM). The output of the FP-SA can be split by the optical coupler OC3. One beam is subjected to spectral analysis through an optical spectrum analyzer (OSA, Advantest Q8384); the other beam is converted into an electrical signal through a photodetector (PD, Agilent / HP 11982A), and then enters an oscilloscope (OSC, Keysight DSOV334A) for timing analysis and recording.

[0065] The experimental process and results are as follows:

[0066] Experiment 1, as Figure 5The verification results of the threshold characteristics shown are as follows. An external stimulus signal is designed by an AWG. The external injection signals from TL1 and TL2 (two incoherent optical pulse signals) respectively include four pulses with different powers as shown in (a1) and (b1). (c1) is the first optical pulse signal injected into the FP-SA after coupling. (d1) is the second optical pulse signal characterizing the nonlinear calculation result. The third and fourth pairs of external injection signals in (c1) trigger the FP-SA to generate pulses, while the first and second pairs of external injection signals do not respond when injected into the FP-SA. This demonstrates the excitatory threshold characteristics of the FP-SA. Moreover, the FP-SA neuron can simultaneously respond to external pulse injections of two different wavelengths.

[0067] To prove that the results of Experiment 1 above are not accidental and reproducible, 100 consecutive identical stimuli were continuously applied to the device. The experimental results are shown in the color-coded time plot of the superimposed time series as shown in (e1). Among them, the horizontal axis represents the repetition period of the optical pulse signal applied to the photon pulse neuron, and the vertical axis represents the time axis of a single period. It can be observed that the response of the FP-SA neuron to 100 consecutive identical stimulus events is consistent, indicating that the threshold response generated by the FP-SA after incoherent dual-wavelength optical injection is reproducible.

[0068] (a1)-(e1) are the experimental results when light of two wavelengths is injected on the right side of the central wavelength (λ FP-SA-peak ) of the FP-SA, as shown in Figure (f1). (a2)-(e2) are the experimental results under the injection conditions where light of two wavelengths is injected on the left side of λ FP-SA-peak as shown in (f2). Similarly, the results of threshold response and reproducibility can be observed.

[0069] Experiment 2, the verification results of the time-domain cumulative characteristics shown are as follows. As shown in the injection spectrum of (f1), light of two wavelengths is injected on λ Figure 6 as shown. FP-SA-peakOn the right side. As shown in (a1) and (b1), an external stimulus signal is designed by an AWG. The external injection signals from TL1 and TL2 (two incoherent optical pulse signals) each include four pulses of the same power. (c1) is the first optical pulse signal injected into the FP-SA after coupling, including two single-pulse signals and three pairs of pulse signals. The first single pulse comes from TL1, and the last single pulse comes from TL2. The three pairs of pulse signals have different inter-pulse intervals (ISIs). The two pulses in each pulse pair come from two injections with different wavelengths. As shown in (d1), the first pulse pair has the smallest ISIs and triggers the FP-SA neuron to generate a pulse, while the second and third pulse pairs with larger ISIs do not cause an FP-SA response. At the same time, the first single pulse from TL1 and the last single pulse from TL2 do not trigger spikes, that is, a single pulse signal cannot make the FP-SA reach the threshold for generating a pulse. This means that two closely spaced pulses with different wavelengths accumulate in the time domain, thus exceeding the threshold for the FP-SA to generate a pulse. These results demonstrate the time-domain accumulation characteristics of the FP-SA neuron under multi-wavelength injection. (e1) shows the response of the FP-SA neuron to 100 consecutive external injection sequences shown in (c1), revealing the repeatability of the time-domain accumulation based on dual-wavelength optical pulse injection into the FP-SA neuron. As shown in the injection spectrum of (f2), when light of both wavelengths is injected on the left side of λ FP-SA-peak The accumulation characteristics of the FP-SA when injecting on the left side are shown in the experimental results of (a2)-(e2).

[0070] Experiment 3, as Figure 7 shown, the verification results of the refractory period characteristics, when light of both wavelengths is injected at the central wavelength (λ FP-SA-peak) On the right side, the spectrum is as shown in (f1). As shown in (a1) and (b1), the externally injected signals designed by the AWG, the externally injected signals from TL1 and TL2 (two incoherent optical pulse signals) respectively include four pulses with the same power. (c1) is the first optical pulse signal injected into the FP-SA after coupling, including two single-pulse signals and three pairs of pulse signals. By changing the injection power, the refractory period characteristic of the FP-SA neuron is realized. From the response result in (e1), it can be observed that the first single pulse from TL1 and the last single pulse from TL2 can both cause pulse responses, which indicates that the power of the single perturbation pulse exceeds the threshold for the FP-SA to generate pulses. For the first pulse pair, the first injected pulse triggers a pulse, but because the second injected pulse arrives too fast after the first pulse, it fails to trigger another pulse response. However, for the last two pulse pairs with larger ISIs, each injected pulse in the pulse pair can trigger a pulse. This result shows that the gain part of the FP-SA neuron takes several nanoseconds to fully recover its gain, which proves the existence of the refractory period. That is to say, for the last two pulse pairs, the ISIs between the two injected pulses exceed the refractory period, resulting in the appearance of the second pulse response. The color map of the superimposed time series shown in (e1) illustrates the repeatability of the response of the FP-SA neuron to 100 consecutive identical inputs ((c1)). Similarly, (a2)-(e2) show the refractory period response of the FP-SA neuron when light of two wavelengths is injected into the left side of λ FP-SA-peak (the injection spectrum is shown in (f2)).

[0071] The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA in this embodiment can realize nonlinear neural computation through two incoherent optical pulse signals, can relieve the optical power requirement of the coherent wavelength optical injection light source, and can be combined with a large-scale synaptic array to realize a large-scale incoherent photonic pulse neural network.

[0072] Based on the same inventive concept, the embodiment of the present invention also provides a chip for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA, and this chip includes the device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into FP-SA described above.

[0073] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant is intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising said element. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0074] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A device for realizing non-linear neural computation based on dual-wavelength optical pulse injection into an FP-SA, characterized in that, it includes: an optical wave generation module, a coupling module, an optical circulator, and an FP-SA; wherein, the optical wave generation module is used to generate two incoherent optical carriers with different wavelengths, and form two incoherent optical pulse signals according to two electrical pulse signals generated by an arbitrary waveform generator in the optical wave generation module; the optical wave generation module includes the arbitrary waveform generator, a tunable laser, a first polarization controller, a second polarization controller, and two MZMs, wherein the arbitrary waveform generator is used to generate two electrical pulse signals; the tunable laser is used to generate two incoherent optical carriers with different wavelengths; the two incoherent optical carriers with different wavelengths enter the corresponding MZMs after passing through the corresponding first polarization controller and second polarization controller; the two MZMs are used to load the input corresponding two electrical pulse signals onto the corresponding incoherent optical carriers to form two incoherent optical pulse signals; the coupling module is used to couple the two incoherent optical pulse signals to obtain a combined first optical pulse signal; the coupling module includes an adjustable optical delay line, an optical coupler, an adjustable optical attenuator, and a third polarization controller, wherein the adjustable optical delay line is connected to any one of the MZMs, and the adjustable optical delay line is used to compensate for the delay between the two incoherent optical pulse signals; the optical coupler is connected to the adjustable optical delay line, and the optical coupler is used to couple the two incoherent optical pulse signals with compensated delay into one optical signal to obtain the first optical pulse signal; the first optical pulse signal passes through the adjustable optical attenuator and the third polarization controller in sequence and then enters the gain region of the FP-SA through the optical circulator; the adjustable optical attenuator is used to adjust the optical power of the first optical pulse signal; the third polarization controller is used to adjust the polarization state of the first optical pulse signal; the first optical pulse signal enters the FP-SA through the optical circulator; the FP-SA is used to perform non-linear response on the first optical pulse signal to realize non-linear computation, and a second optical pulse signal representing the non-linear computation result is output externally through the optical circulator.

2. The device for realizing non-linear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 1, characterized in that, the gain region current applied to the gain region of the FP-SA does not exceed the Q-switching pulse threshold corresponding to the reverse bias voltage applied to the saturation absorption region of the FP-SA, and can cause the FP-SA to operate in an excited state; the Q-switching pulse threshold is defined as: under the condition of no external optical input and a given reverse bias voltage, the minimum gain region current at which the FP-SA is excited to the Q-switching pulse state.

3. The device for realizing non-linear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 2, characterized in that, the value range of the reverse bias voltage is -6V to 0V, and the value range of the gain region current is 0 to 120 mA.

4. The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 2, wherein, the device further includes a laser diode controller, and the laser diode controller is configured to apply a gain region current to the FP-SA and simultaneously control the operating temperature of the FP-SA by using the laser diode controller.

5. The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 1, wherein, the wavelengths of the two incoherent optical pulse signals match two different longitudinal modes of the FP-SA.

6. The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 1, wherein, there is a wavelength difference between the wavelengths of the two incoherent optical pulse signals and the central operating wavelength of the FP-SA, and the signs of the two wavelength differences are the same.

7. The device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to claim 1, wherein, the optical wave generation module further includes two radio frequency amplifiers, and the radio frequency amplifiers are configured to amplify the corresponding electrical pulse signals to drive the corresponding MZMs.

8. A chip for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA, wherein, it includes the device for realizing nonlinear neural computation based on dual-wavelength optical pulse injection into an FP-SA according to any one of claims 1 to 7.

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