Multi-mode dual-channel optical communication integrated device and implementation method

Abstract

The embodiment of the invention provides a multi-mode dual-channel optical communication integrated device and an implementation method. The multi-mode dual-channel optical communication integrated device comprises the steps that a first light source module, a second light source module, a mode multiplexing module, an optical modulation module and a dual-channel output module are sequentially integrated on the surface of a buffer layer; the first light source module emits an optical signal of a first wavelength and transmits the optical signal to the mode multiplexing module; an optical signal of a second wavelength is emitted through the second light source module and is transmitted to the mode multiplexing module; combining the optical signal of the first wavelength and the optical signal of the second wavelength into a composite optical signal through a mode multiplexing module; modulating the composite optical signal through an optical modulation module to obtain a dual-channel modulation signal; and the dual-channel modulation signal is separated into a first wavelength signal and a second wavelength signal which are independent from each other through the dual-channel output module, and the first wavelength signal and the second wavelength signal are output to an external optical communication system.

Description

Technical Field

[0001] The present invention relates to the field of information technology, and in particular to a multimodal dual-channel optical communication integrated device and an implementation method thereof. Background Art

[0002] Dual-channel optical communication systems are of great significance in improving transmission capacity and flexibility, but their implementation faces multiple technical challenges. The primary problem is how to efficiently generate, multiplex, and modulate optical signals of two different wavelengths on a single integrated photonic chip while ensuring signal quality and system stability. This involves the precise design and integration of multiple optical components such as light sources, waveguides, and couplers. Secondly, during the modulation process of dual-channel signals, how to achieve precise frequency spacing and phase control between the two channels while ensuring modulation efficiency is also a key issue. This requires considering the structural design of Mach-Zehnder modulators and the precise control of drive signals. Moreover, the separation and detection of dual-channel signals also pose challenges, such as how to achieve efficient wavelength separation on the chip and accurately monitor the power of each channel for real-time feedback adjustment. In addition, issues such as the temperature stability, power consumption control, and compatibility with external fiber optic networks of the entire system also need to be considered comprehensively. These technical difficulties are interrelated and together constitute the core challenges for implementing a high-performance, reliable, and stable dual-channel optical communication system. Summary of the Invention

[0003] In view of the above problems, a multimodal dual-channel optical communication integrated device and an implementation method are proposed to overcome or at least partially solve the above problems.

[0004] In some embodiments of the present application, a multi-channel motor drive control system is disclosed, including:

[0005] A first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module are sequentially integrated on the surface of the buffer layer, wherein the buffer layer is disposed on a substrate;

[0006] The first light source module emits an optical signal of a first wavelength and transmits it to the mode multiplexing module; and the second light source module emits an optical signal of a second wavelength and transmits it to the mode multiplexing module;

[0007] The mode multiplexing module combines the optical signal of the first wavelength with the optical signal of the second wavelength into a composite optical signal;

[0008] The optical modulation module modulates the composite optical signal to obtain a dual-channel modulation signal;

[0009] The dual-channel modulation signal is separated into an independent first-wavelength signal and a second-wavelength signal by the dual-channel output module and output to an external optical communication system.

[0010] Further, the step of emitting an optical signal with a first wavelength by the first light source module and transmitting it to the mode multiplexing module includes:

[0011] Using a gallium nitride-based semiconductor laser as the first light source module to generate a first optical signal with a wavelength in the visible or ultraviolet range;

[0012] Transmitting the first optical signal to the input end of the mode multiplexing module through a first optical waveguide;

[0013] The step of emitting an optical signal with a second wavelength by the second light source module and transmitting it to the mode multiplexing module includes:

[0014] Using an erbium-doped gallium nitride optical amplifier as the second light source module to receive the pump light of the first light source module and generate a second optical signal in the infrared band;

[0015] Transmitting the second optical signal to the other input end of the mode multiplexing module through a second optical waveguide.

[0016] Further, the step of combining the optical signal with the first wavelength and the optical signal with the second wavelength into a composite optical signal by the mode multiplexing module includes:

[0017] Using a directional coupler, a multimode interference coupler or a Bragg grating filter as the mode multiplexing module;

[0018] If the directional coupler is used, the mode superposition of the optical signal with the first wavelength and the optical signal with the second wavelength is realized through symmetric or asymmetric waveguides;

[0019] If the multimode interference coupler is used, the mode multiplexing of the optical signal with the first wavelength and the optical signal with the second wavelength is realized through the self-imaging effect of the multimode waveguide;

[0020] If the Bragg grating filter is used, the optical signal with the first wavelength and the optical signal with the second wavelength are selectively coupled through periodic refractive index modulation.

[0021] Further, the step of modulating the composite optical signal by the optical modulation module to obtain a dual-channel modulation signal includes:

[0022] Using a dual-channel Mach-Zehnder modulator, an electro-absorption modulator array or a ring resonator modulator as the optical modulation module;

[0023] If the dual-channel Mach-Zehnder modulator is adopted, drive signals of the first channel and the second channel are respectively loaded through two independently modulated interference arms;

[0024] If the electro-absorption modulator array is adopted, modulation is performed on the optical signals of the first wavelength and the second wavelength respectively through two groups of independent quantum well structures;

[0025] If the ring resonator modulator is adopted, selective modulation of the first channel and the second channel is achieved through resonance wavelength matching.

[0026] Furthermore, using the dual-channel Mach-Zehnder modulator as the optical modulation module includes:

[0027] A length difference is set between the two interference arms of the dual-channel Mach-Zehnder modulator, and the length difference satisfies the formula:

[0028] ΔL = c / (2nΔf), where ΔL represents the length difference between the two interference arms, c represents the speed of light, n represents the effective refractive index of the waveguide, and Δf represents the frequency interval of the dual channels;

[0029] Crosstalk between the first channel and the second channel is suppressed through the length difference;

[0030] Drive signals are respectively applied to the two interference arms to generate the dual-channel modulation signal.

[0031] Furthermore, using the dual-channel output module to separate the dual-channel modulation signal into independent first-wavelength signals and second-wavelength signals and output them to an external optical communication system includes:

[0032] Using an arrayed waveguide grating, a polarization beam splitter or a tapered coupling structure as the dual-channel output module;

[0033] If the arrayed waveguide grating is adopted, the dual-channel modulation signal is separated through wavelength difference;

[0034] If the polarization beam splitter is adopted, the dual-channel modulation signals in orthogonal polarization states are separated through a birefringent waveguide;

[0035] If the tapered coupling structure is adopted, the separated first-wavelength signals and second-wavelength signals are coupled to an external optical fiber through a tapered waveguide, and the end face tilt angle of the tapered coupling structure is a preset angle to reduce reflection loss.

[0036] Furthermore, integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module and a dual-channel output module in sequence on the surface of the buffer layer includes:

[0037] Using sapphire, silicon carbide or silicon as the substrate;

[0038] Using a gallium aluminum nitride graded layer as the buffer layer, the composition of the gallium aluminum nitride graded layer being Al x Ga 1-x N, where x satisfies 0 < x ≤ 1;

[0039] By setting the thickness of the buffer layer within a preset range to reduce lattice mismatch;

[0040] By growing the buffer layer on the substrate and sequentially integrating the first light source module, the second light source module, the mode multiplexing module, the optical modulation module, and the dual-channel output module on the surface of the buffer layer.

[0041] Furthermore, modulating the composite optical signal by the optical modulation module to obtain a dual-channel modulation signal includes:

[0042] Using a nested ring resonator as the optical modulation module;

[0043] Generating optical signals of the first wavelength and the second wavelength with different polarization states through a sub-wavelength grating structure;

[0044] Converting the polarization states of the optical signals of the first wavelength and the second wavelength into the same polarization state through a polarization beam splitting rotator;

[0045] Thermally tuning the resonant wavelength of the nested ring resonator to separate the first channel and the second channel;

[0046] Integrating a dual-channel photodetector to real-time monitor the power difference between the first channel and the second channel and perform feedback control.

[0047] In one embodiment of the present application, a multimodal dual-channel optical communication integrated device is further disclosed. The integrated device is used to implement the above method, and the integrated device includes:

[0048] An integrated light source, sequentially integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module on the surface of the buffer layer, wherein the buffer layer is disposed on the substrate;

[0049] An optical transmission unit, emitting an optical signal of the first wavelength through the first light source module and transmitting it to the mode multiplexing module; and emitting an optical signal of the second wavelength through the second light source module and transmitting it to the mode multiplexing module;

[0050] An optical composite unit, combining the optical signal of the first wavelength and the optical signal of the second wavelength into a composite optical signal through the mode multiplexing module;

[0051] An optical modulation unit that modulates the composite optical signal through the optical modulation module to obtain a dual-channel modulation signal;

[0052] An optical output unit that separates the dual-channel modulation signal into independent first and second wavelength signals through the dual-channel output module and outputs them to an external optical communication system.

[0053] The embodiments of the present invention have the following advantages:

[0054] The generation, multiplexing, modulation, and separation of dual-wavelength optical signals are achieved by integrating multiple optical modules on a substrate. The present invention uses an asymmetric directional coupler to multiplex optical signals of two wavelengths into a single optical waveguide output, and then uses a dual-channel Mach-Zehnder modulator for intensity or phase modulation, where the arm length difference satisfies a specific formula to achieve a dual-channel frequency interval. The modulated signal is separated by an arrayed waveguide grating and coupled to an external optical fiber. At the same time, an integrated photodetector is used to monitor the channel power difference of the output signal in real time, and the driving signal is dynamically adjusted through a feedback control module to optimize the dual-channel modulation effect. The present invention realizes high-efficiency and controllable dual-channel optical communication, improves the transmission capacity and flexibility of the system, and provides a new technical solution for high-capacity optical communication systems. Description of the Drawings

[0055] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0056] Figure 1 It is a flowchart of a multi-modal dual-channel optical communication integrated device of the present invention. Detailed Embodiments

[0057] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments. Obviously, the described embodiments are some embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0058] Refer to Figure 1 , which shows a flowchart of the steps of a multi-modal dual-channel optical communication implementation method provided by some embodiments of the present invention, and specifically may include:

[0059] S101. Integrate a first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module on the surface of the buffer layer in sequence, where the buffer layer is disposed on a substrate.

[0060] Use sapphire, silicon carbide, or silicon as the substrate material, and deposit Al x Ga 1- x N graded layer on the substrate by chemical vapor deposition, control the thickness to be 1 - 5 μm to obtain a buffer layer with low lattice mismatch. According to the surface characteristics of the buffer layer, deposit GaN-based materials on the buffer layer in sequence by molecular beam epitaxy technology to form the semiconductor laser structure of the first light source module, and determine the output wavelength to be visible light or ultraviolet light with a wavelength of 400 - 500 nm. Use erbium-doped GaN material, and form the optical amplifier structure of the second light source module on the buffer layer by photolithography and etching processes, obtain the pump light excitation of the first light source module, and obtain an optical signal with a wavelength of 1.5 μm. Through simulation by optical waveguide design software, generate the geometric structures of the first optical waveguide and the second optical waveguide, use plasma-enhanced chemical vapor deposition method to fabricate the optical waveguide on the buffer layer, and determine that the optical signal is transmitted to the input end of the mode multiplexing module. If the mode multiplexing module selects an arrayed waveguide grating, separate the first wavelength and second wavelength signals by wavelength difference; if it selects a polarization beam splitter, separate the orthogonal polarization state signals by a birefringent waveguide; if it selects a tapered coupling structure, couple the signals through a tapered waveguide and a 5° - 15° end face tilt angle to obtain a composite optical signal output by a single optical waveguide. According to the characteristics of the composite optical signal, use the electro-optic effect or the thermo-optic effect, and apply an electric field or a thermal field in the optical modulation module to modulate the intensity, phase, or polarization of the composite optical signal to generate a dual-channel modulation signal. Obtain the dual-channel modulation signal, optimize the demultiplexer structure by demultiplexer design software, use photolithography technology to fabricate the demultiplexer, separate the modulated composite optical signal into independent first wavelength signal and second wavelength signal, and determine the wavelength purity of the separated signals. Through the simulation design of a tapered optical waveguide or an optical fiber array, use precision photolithography and etching processes to fabricate the output structure, couple the separated first wavelength signal and second wavelength signal to an external optical communication system to obtain a high-efficiency optical signal output. According to the intensity and wavelength characteristics of the output optical signal, detect it by a spectral analyzer and a power meter, judge whether the signal meets the transmission requirements of the external optical communication system, and generate the final performance verification data.

[0061] It should be noted that an optical waveguide is a structure for transmitting and guiding optical signals, usually formed by surrounding a low refractive index medium with a high refractive index medium.

[0062] Exemplarily, use sapphire as the substrate material, and deposit Al x Ga 1-xAn N-graded layer with a controlled thickness of 3 μm is used to obtain a buffer layer with low lattice mismatch. According to the surface characteristics of the buffer layer, GaN-based materials are sequentially deposited on the buffer layer by molecular beam epitaxy to form the semiconductor laser structure of the first light source module, and visible light with an output wavelength of 450 nm is determined. An erbium-doped GaN material is used, and a light amplifier structure of the second light source module is formed on the buffer layer through photolithography and etching processes, and pump light excitation of the first light source module is obtained to get an optical signal with a wavelength of 1.5 μm. Through simulation by optical waveguide design software, the geometric structures of the first optical waveguide and the second optical waveguide are generated, and optical waveguides are fabricated on the buffer layer by plasma-enhanced chemical vapor deposition to determine that the optical signal is transmitted to the input end of the mode multiplexing module. If the mode multiplexing module selects an arrayed waveguide grating, the 450 nm and 1.5 μm signals are separated by wavelength difference; if it selects a polarization beam splitter, the orthogonally polarized state signals are separated by a birefringent waveguide; if it selects a tapered coupling structure, the signals are coupled through a tapered waveguide and a 10° end face tilt angle to obtain a composite optical signal output by a single optical waveguide. According to the characteristics of the composite optical signal, using the electro-optic effect, the composite optical signal is intensity-modulated by applying an electric field in the optical modulation module to generate a dual-channel modulation signal. The dual-channel modulation signal is obtained, the structure of the demultiplexer is optimized by demultiplexer design software, and the demultiplexer is fabricated by photolithography technology to separate the modulated composite optical signal into independent 450 nm and 1.5 μm signals, and the wavelength purity of the separated signals is determined. Through the simulation design of the tapered optical waveguide, the output structure is fabricated by precision photolithography and etching processes, and the separated 450 nm and 1.5 μm signals are coupled to an external optical communication system to obtain a high-efficiency optical signal output. According to the intensity and wavelength characteristics of the output optical signal, it is detected by a spectrum analyzer and a power meter to determine whether the signal meets the transmission requirements of the external optical communication system, and the final performance verification data is generated.

[0063] S102. An optical signal with a first wavelength is emitted by the first light source module and transmitted to the mode multiplexing module; and an optical signal with a second wavelength is emitted by the second light source module and transmitted to the mode multiplexing module.

[0064] Drive the first light source module through an external power supply. The GaN-based semiconductor laser emits an optical signal with a wavelength of 400 - 500 nm to obtain the first-wavelength optical signal. Transmit the optical signal with a wavelength of 400 - 500 nm through the first optical waveguide. Adopt a low-loss optical waveguide structure to obtain the optical signal transmitted to the input end of the mode multiplexing module. Acquire the optical signal transmitted to the input end of the mode multiplexing module. Process the TE-polarized 400 - 500 nm optical signal through a polarization beam splitting rotator to obtain the optical signal converted to a unified polarization state. Receive the 400 - 500 nm optical signal with a unified polarization state through the mode multiplexing module. Adopt the dual-drive electrode Mach-Zehnder structure of the optical modulation module to obtain the initial modulated optical signal. If the bias voltage of the initial modulated optical signal is within the range of 0 - 5 V, apply the bias voltage through the Mach-Zehnder structure to obtain the modulated optical signal with a modulation bandwidth of 10 GHz. Intensity-modulate the modulated optical signal through the optical modulation module. Based on the electro-optic effect processing, obtain the dual-channel modulation signal. Acquire the dual-channel modulation signal. Separate the optical signal with a wavelength of 400 - 500 nm through the demultiplexer of the dual-channel output module to obtain the independent first-wavelength signal. Transmit the independent first-wavelength signal through the tapered optical waveguide. Adopt the arrayed waveguide grating structure to obtain the output signal with a channel spacing of 200 GHz. Perform temperature control processing on the output signal through a thermoelectric cooler. Adopt a control algorithm with a temperature control accuracy of ±0.1 °C to obtain the first-wavelength output signal with a stable wavelength.

[0065] Exemplarily, the first light source module is driven by an external power supply, and a semiconductor laser based on GaN emits an optical signal with a wavelength of 400 - 500 nm. Specifically, a 5V DC power supply is used for driving, and the output power of the laser is 10 mW to obtain the optical signal of the first wavelength. The optical signal with a wavelength of 400 - 500 nm is transmitted through the first optical waveguide. A low-loss optical waveguide structure is adopted, and the waveguide loss is 0.1 dB / cm to obtain the optical signal transmitted to the input end of the mode multiplexing module. The optical signal transmitted to the input end of the mode multiplexing module is acquired, and the TE-polarized optical signal with a wavelength of 400 - 500 nm is processed by a polarization beam splitting rotator with a rotation angle of 45° to obtain the optical signal converted to a unified polarization state. The mode multiplexing module receives the optical signal with a wavelength of 400 - 500 nm in the unified polarization state, and a dual-drive electrode Mach-Zehnder structure of the optical modulation module with an electrode spacing of 10 μm is adopted to obtain the initial modulated optical signal. If the bias voltage of the initial modulated optical signal is within the range of 0 - 5V, then a bias voltage is applied through the Mach-Zehnder structure, and the bias voltage value is 3V to obtain the modulated optical signal with a modulation bandwidth of 10 GHz. The optical modulation module performs intensity modulation on the modulated optical signal, and based on the electro-optic effect, the modulation depth is 90% to obtain the dual-channel modulation signal. The dual-channel modulation signal is acquired, and the optical signal with a wavelength of 400 - 500 nm is separated by a demultiplexer of the dual-channel output module. The center wavelength of the demultiplexer is 450 nm to obtain the independent first wavelength signal. The independent first wavelength signal is transmitted through a tapered optical waveguide. An arrayed waveguide grating structure is adopted with a grating period of 1.5 μm to obtain the output signal with a channel spacing of 200 GHz. The output signal is temperature-controlled by a thermoelectric cooler, and a control algorithm with a temperature control accuracy of ±0.1°C is adopted, and the set temperature is 25°C to obtain the first wavelength output signal with a stable wavelength.

[0066] The second light source module emits an optical signal of the second wavelength through an external power supply and transmits it to the other input end of the mode multiplexing module through the second optical waveguide.

[0067] Power the second light source module through an external power supply to activate the erbium-doped GaN optical amplifier and obtain excited erbium ions. Input the pump light of the first light source module into the erbium-doped GaN optical amplifier to excite the erbium ions to transition to a higher energy level and obtain an optical signal with a wavelength of 1.5 μm. Amplify the optical signal with a wavelength of 1.5 μm through the optical resonator inside the second light source module to determine a stable optical signal output. Obtain the amplified optical signal with a wavelength of 1.5 μm and transmit it to the second optical waveguide to obtain the optical signal stream of the mode multiplexing module. Optimize the transmission efficiency of the optical signal according to the refractive index and geometric structure of the second optical waveguide, and determine that the loss of the optical signal is lower than the preset threshold. If the loss of the optical signal is lower than the preset threshold, then transmit the optical signal with a wavelength of 1.5 μm to the input end of the mode multiplexing module through the second optical waveguide to obtain a stable input signal. Use the polarization beam splitting rotator of the mode multiplexing module to receive the optical signal with a wavelength of 1.5 μm transmitted by the second optical waveguide and determine the polarization state compatibility with the first light source signal. Combine the optical signal with a wavelength of 1.5 μm with the optical signal with a wavelength of 400 - 500 nm of the first light source through the mode multiplexing module to obtain a composite optical signal of a single optical waveguide. Obtain the composite optical signal and transmit it to the optical modulation module to determine that the intensity and phase of the composite optical signal meet the modulation requirements.

[0068] Exemplarily, the external power supply drives the erbium-doped GaN optical amplifier with a DC voltage of 3.5 V to cause population inversion of erbium ions at the 4F3 / 2 energy level. The first light source module outputs 450 nm pump light, which is coupled to the active region of the erbium-doped GaN through a focusing lens, and the pump power density reaches 50 mW / μm 2 , exciting erbium ions to generate 1.53 μm spontaneous emission light. The optical resonator uses a distributed Bragg reflector (reflectivity > 99.8%) and a semi-transmissive output mirror (transmittance 30%), and filters the longitudinal mode in the 1.5 μm band through the Fabry-Perot interference effect, and the linewidth is compressed to less than 0.1 nm. The amplified optical signal is coupled to the second optical waveguide through a tapered waveguide (cone angle 8°), the waveguide cross-section size is 1.5 μm × 0.8 μm, and the TE00 mode transmission loss is calculated to be 0.2 dB / cm by the finite element method. The wavelength scanning method is used to measure the optical power attenuation curve, and the insertion loss measured at 1.5 μm is 1.2 dB, which is lower than the 1.5 dB threshold. The polarization beam splitting rotator is based on a sub-wavelength grating structure (period 300 nm, duty cycle 0.6), which converts the input TM mode to the TE mode, and the extinction ratio reaches 25 dB. The mode multiplexing module uses a multimode interference coupler (length 75 μm, width 4 μm), and the two optical signals form a phase difference of π / 2 in the interference region, and the power uniformity error at the output end is < 5%. The composite optical signal enters the Mach-Zehnder modulator, and when a driving voltage of 3 Vpp is applied, the measured modulation depth is 98% and the 3 dB bandwidth is 12 GHz.

[0069] S103. Combine the optical signal of the first wavelength and the optical signal of the second wavelength into a composite optical signal through the mode multiplexing module. Specifically, the mode multiplexing module can be used to combine the optical signals of the first wavelength and the second wavelength into a single optical waveguide output through an asymmetric directional coupler to obtain a composite optical signal.

[0070] Obtain the optical signal of the first wavelength output by the first light source module, and transmit it through the first optical waveguide to the first input end of the asymmetric directional coupler to obtain the waveguide transmission data of the optical signal of the first wavelength. Obtain the optical signal of the second wavelength output by the second light source module, and transmit it through the second optical waveguide to the second input end of the asymmetric directional coupler to obtain the waveguide transmission data of the optical signal of the second wavelength. Calculate the coupling coefficient of the optical signal of the first wavelength and the optical signal of the second wavelength according to the waveguide structure parameters of the asymmetric directional coupler, and determine the initial composite optical signal of mode superposition. Adjust the phase matching condition of the optical signal of the first wavelength and the optical signal of the second wavelength through the waveguide length and refractive index distribution of the asymmetric directional coupler to obtain an optimized composite optical signal. If the power distribution of the composite optical signal meets the preset threshold, output the composite optical signal through a single optical waveguide to obtain stable multiplexed optical signal data. Modulate the intensity of the multiplexed optical signal according to the electro-optic effect parameters of the optical modulation module to obtain the preliminary data of the dual-channel modulation signal. Adjust the polarization state of the dual-channel modulation signal through the polarization modulation function of the optical modulation module to obtain a modulation signal that conforms to the communication protocol. Obtain the demultiplexer parameters of the dual-channel output module, separate the modulated composite optical signal into independent optical signals of the first wavelength and the second wavelength, and determine the separated signal data. Optimize the geometric parameters of the tapered optical waveguide to transmit the separated optical signals of the first wavelength and the second wavelength to the external optical communication system to obtain the final communication output signal.

[0071] Exemplarily, the first light source module uses a GaN-based semiconductor laser to output a visible light signal with a wavelength of 450 nm, which is transmitted to the first input end of the asymmetric directional coupler through a first optical waveguide with a width of 1.5 μm, and the transmission loss of the optical waveguide is controlled within 0.2 dB / cm. The second light source module uses an erbium-doped GaN optical amplifier to output a light signal with a wavelength of 1.5 μm after receiving 450 nm pump light, which is transmitted to the second input end of the asymmetric directional coupler through a second optical waveguide with a width of 2 μm, and the group refractive index of the waveguide is set to 3.4. The waveguide spacing of the asymmetric directional coupler is designed to be 0.8 μm, and the coupling coefficient of the TE mode is calculated to be 0.25 dB / μm by the finite element method, and the initial composite optical signal power ratio after mode superposition is determined to be 1:1. By adjusting the waveguide length of the asymmetric directional coupler to 50 μm and optimizing the refractive index distribution to make Δn = 0.01, the phase matching of the dual-wavelength signal is achieved, and the crosstalk of the composite optical signal is reduced to below -30 dB. An optical detector is used to monitor the power of the composite optical signal. When the main mode power reaches 5 mW and the side mode suppression ratio is greater than 20 dB, a single optical waveguide output is triggered. The optical modulation module loads a 10 Gbps NRZ electrical signal and uses the electro-optic coefficient r33 = 30 pm / V of the lithium niobate waveguide to perform intensity modulation on the composite optical signal, and the modulation depth reaches 90%. The polarization angle of the dual-channel modulation signal is adjusted to 45° by integrating a polarization controller to meet the polarization multiplexing requirements of coherent communication. The demultiplexer uses an arrayed waveguide grating structure with a channel spacing of 100 nm, and the isolation after separating the 1.5 μm and 450 nm signals is better than 40 dB. The input end width of the tapered optical waveguide gradually changes from 3 μm to 1 μm, and the output end is aligned with the single-mode fiber array, and the coupling efficiency is increased to more than 95%.

[0072] S104. Modulate the composite optical signal through the optical modulation module to obtain a dual-channel modulation signal; specifically, through the optical modulation module, intensity modulation or phase modulation is performed on the composite optical signal based on a dual-channel Mach-Zehnder modulator to obtain a dual-channel modulation signal, where the arm length difference satisfies the formula ΔL = c / (2nΔf), Δf is the dual-channel frequency spacing, n is the effective refractive index of the waveguide, and c is the speed of light.

[0073] Obtain the first-wavelength optical signal emitted by the first light source module and the second-wavelength optical signal emitted by the second light source module, and transmit them through the first optical waveguide and the second optical waveguide to the input end of the mode multiplexing module to obtain the input signal of the multiplexing module. By using the mode multiplexing technology in the mode multiplexing module, combine the first-wavelength optical signal and the second-wavelength optical signal into a single optical waveguide output to obtain a composite optical signal. Through the dual-channel Mach-Zehnder modulator in the optical modulation module, receive the composite optical signal and distribute it to two independent modulation interference arms to obtain the split optical signal. Obtain the double-channel frequency interval Δf and the effective refractive index n of the waveguide, calculate the length difference ΔL between the two arms, and use the formula ΔL = c / (2nΔf), where c is the speed of light, to obtain the length difference between the two arms that satisfies the phase modulation condition. According to the calculated ΔL, adjust the physical lengths of the two interference arms in the dual-channel Mach-Zehnder modulator to obtain a modulator structure that meets the design requirements. Through the two interference arms of the dual-channel Mach-Zehnder modulator, load the drive signals of the first channel and the second channel respectively, and perform intensity modulation or phase modulation on the split optical signal to obtain the modulated interference signal. Through the output end of the Mach-Zehnder modulator, recombine the modulated interference signal to obtain a double-channel modulation signal. Through the demultiplexer of the double-channel output module, separate the double-channel modulation signal into independent first-wavelength signal and second-wavelength signal to obtain the separated double-channel signal. Through the tapered optical waveguide or fiber array, couple the separated double-channel signal to the external optical communication system, and control the end face tilt angle within 5°-15° to obtain the finally output optical communication signal.

[0074] Exemplarily, the first light source module uses a 1550 nm DFB laser to generate a first wavelength optical signal, and the second light source module uses a 1310 nm FP laser to generate a second wavelength optical signal, which is transmitted to the mode multiplexing module through a silicon optical waveguide with a width of 500 nm. The mode multiplexing module uses a multimode interference coupler to couple the 1550 nm and 1310 nm optical signals to a single silicon waveguide with a width of 1 μm to form a composite optical signal. After receiving the composite optical signal, the dual-channel Mach-Zehnder modulator evenly distributes the optical power to the two gallium arsenide waveguide interference arms through a 3 dB coupler. According to the dual-channel frequency interval Δf = 25 GHz and the effective refractive index of the waveguide n = 3.4, the arm length difference ΔL = 1764 μm is calculated. An interference arm structure with a length difference of 1764 μm is fabricated on a gallium arsenide substrate using an electron beam lithography process. A 10 Gbps NRZ electrical signal is loaded on the first interference arm to intensity-modulate the 1550 nm light, and a π / 2 phase bias voltage is loaded on the second interference arm to phase-modulate the 1310 nm light. The two modulated optical signals are combined through a 2×2 multimode interference coupler to output a dual-channel QPSK modulation signal. The arrayed waveguide grating demultiplexer separates the 1550 nm and 1310 nm signals using a 20 nm channel interval. The tapered coupling structure uses a silicon nitride waveguide with an end face inclination angle of 8°, and couples the separated signal to a single-mode fiber with a core diameter of 9 μm through mode field matching.

[0075] S105. Separate the dual-channel modulation signal into independent first wavelength signal and second wavelength signal through the dual-channel output module and output them to an external optical communication system. Specifically, through the dual-channel output module, use an arrayed waveguide grating to separate the dual-channel modulation signal into independent first wavelength signal and second wavelength signal.

[0076] Receive the dual-channel modulation signal output by the optical modulation module through the dual-channel output module to obtain the composite optical signal data. Use an arrayed waveguide grating to perform wavelength splitting on the composite optical signal to separate the first wavelength signal and the second wavelength signal. Determine the spectral distributions of the separated first wavelength signal and second wavelength signal according to the wavelength difference characteristics of the arrayed waveguide grating. Optimize the optical path of the separated first wavelength signal through a tapered coupling structure to obtain a first wavelength output signal with low reflection loss. Optimize the optical path of the separated second wavelength signal through a tapered coupling structure to obtain a second wavelength output signal with low reflection loss. If the intensity of the first wavelength output signal is lower than the preset threshold, perform intensity compensation through a signal amplification algorithm to obtain an enhanced first wavelength signal. If the intensity of the second wavelength output signal is lower than the preset threshold, perform intensity compensation through a signal amplification algorithm to obtain an enhanced second wavelength signal. Use an optical fiber array to perform coupling processing on the enhanced first wavelength signal to determine the output parameters for transmitting it to an external optical communication system. Use an optical fiber array to perform coupling processing on the enhanced second wavelength signal to determine the output parameters for transmitting it to an external optical communication system.

[0077] Exemplarily, a dual-channel modulation signal output by an optical modulation module is received through a dual-channel output module to obtain composite optical signal data, which contains spectral information of a first wavelength signal of 1550 nm and a second wavelength signal of 1310 nm. An arrayed waveguide grating is used to perform wavelength splitting on the composite optical signal. By using an arrayed waveguide grating with a grating period of 500 nm, the optical signals of 1550 nm and 1310 nm are separated. According to the wavelength difference characteristics of the arrayed waveguide grating, the spectral distributions of the separated 1550 nm signal and 1310 nm signal are determined, and the spectral resolution reaches 0.1 nm. The optical path of the separated 1550 nm signal is optimized through a tapered coupling structure. The end face tilt angle of the tapered waveguide is set to 10°, and a first wavelength output signal with a reflection loss lower than 0.5 dB is obtained. The optical path of the separated 1310 nm signal is optimized through a tapered coupling structure. The end face tilt angle of the tapered waveguide is set to 12°, and a second wavelength output signal with a reflection loss lower than 0.6 dB is obtained. If the intensity of the 1550 nm output signal is lower than a preset threshold of -20 dBm, intensity compensation is performed through a signal amplification algorithm. By using an erbium-doped fiber amplifier with a gain of 20 dB, an enhanced 1550 nm signal is obtained. If the intensity of the 1310 nm output signal is lower than a preset threshold of -18 dBm, intensity compensation is performed through a signal amplification algorithm. By using a semiconductor optical amplifier with a gain of 18 dB, an enhanced 1310 nm signal is obtained. An optical fiber array is used to perform coupling processing on the enhanced 1550 nm signal. The core diameter of the optical fiber array is 9 μm, and the output parameters for transmitting it to an external optical communication system are determined, including an output power of 0 dBm and an insertion loss of 1 dB. An optical fiber array is used to perform coupling processing on the enhanced 1310 nm signal. The core diameter of the optical fiber array is 8 μm, and the output parameters for transmitting it to an external optical communication system are determined, including an output power of -1 dBm and an insertion loss of 1.2 dB.

[0078] The separated first wavelength signal and second wavelength signal can also be coupled to an external optical fiber through a tapered coupling structure to obtain an output optical signal.

[0079] Receive the first wavelength signal and the second wavelength signal separated by the dual-channel output module through the tapered optical waveguide structure to obtain the initial optical signal data. Adjust the mode field diameter of the optical signal according to the geometric parameters of the tapered optical waveguide to obtain an optical signal that matches the mode field of the external optical fiber. Use a demultiplexer to perform spectral separation on the first wavelength signal and the second wavelength signal to determine independent optical signal channels. Perform mode superposition on the separated dual-wavelength signals through the directional coupler of the symmetric waveguide structure to obtain a composite optical signal. Adjust the taper angle parameter of the tapered optical waveguide according to the intensity distribution of the composite optical signal to obtain an optimized coupled optical signal. If the polarization state of the optimized coupled optical signal does not meet the requirements of the external optical fiber, perform polarization correction on the signal through the polarization modulation module to determine the corrected optical signal. Couple the corrected optical signal to the external optical fiber through the fiber array to obtain the output optical signal. Perform selective coupling using a Bragg grating filter according to the power distribution of the output optical signal to obtain a stably output optical signal. Decode the stably output optical signal through an external optical communication system to obtain the final dual-channel communication data.

[0080] Exemplarily, the tapered optical waveguide structure takes the 1.5μm and 400 - 500nm dual-wavelength signals as input, the waveguide width gradually changes from 10μm to 5μm, so that the mode field diameter is compressed from 6μm to 4.2μm, matching the 5μm mode field tolerance of the single-mode optical fiber. The demultiplexer adopts an arrayed waveguide grating (AWG) design with a channel spacing of 100nm, achieving -30dB crosstalk suppression in the 1550nm and 450nm bands. The directional coupler adopts an asymmetric waveguide structure with a waveguide spacing of 2μm and a coupling length of 200μm, so that the coupling efficiencies of the TE mode and the TM mode reach 95% and 88% respectively. According to the intensity distribution detected by the optical field analyzer, dynamically adjust the taper angle of the tapered waveguide from 5° to 3°, improving the output spot uniformity to 90%. If the polarization analyzer detects that the polarization extinction ratio is lower than 15dB, apply a 5V bias voltage through a lithium niobate polarization controller to correct the extinction ratio to more than 20dB. The fiber array adopts a V-groove package with a core pitch of 250μm, and the distance between the core and the end face of the tapered waveguide is controlled within 1μm, with an insertion loss lower than 0.5dB. Based on the power fluctuation data monitored by the spectrometer, the Bragg grating filter sets a 5nm bandwidth at 1550nm with a reflectivity of 99%, ensuring that the output power stability is within the range of ±0.1dBm. The optical communication system adopts a QPSK demodulation algorithm to parse the dual-channel data at a symbol rate of 25Gbaud, with a bit error rate lower than 1E-12.

[0081] The channel power difference of the output optical signal is monitored in real time by an integrated photodetector to obtain power difference data. Specifically, the integrated photodetector receives the first wavelength signal and the second wavelength signal output by the dual-channel output module and converts them into corresponding electrical signals. An analog-to-digital converter samples the electrical signals output by the photodetector to obtain the digital voltage values of the first wavelength signal and the second wavelength signal. The power values of the first wavelength signal and the second wavelength signal are calculated based on the digital voltage values to obtain the optical power data of each channel. By comparing the power value of the first wavelength signal with the power value of the second wavelength signal, the power difference between the two is calculated to obtain the power difference data. If the power difference data exceeds the preset threshold, the power balance algorithm is triggered to generate a modulation driver signal adjustment instruction. According to the adjustment instruction, the interference arm driver signal of the dual-channel Mach-Zehnder modulator in the optical modulation module is modified to change the modulation intensity, and an updated composite optical signal is obtained. The updated composite optical signal is demultiplexed by the dual-channel output module and separated into a new first wavelength signal and a new second wavelength signal, which are output to the photodetector. The new first wavelength signal and the new second wavelength signal are detected again by the photodetector and converted into new electrical signals to obtain the updated digital voltage values. The power difference data is recalculated based on the updated digital voltage values to determine whether the power difference is within the preset threshold range, and the monitoring result is generated.

[0082] Exemplarily, the integrated photodetector receives the first wavelength signal and the second wavelength signal output by the dual-channel output module, and converts the optical signals into electrical signals. For example, the first wavelength signal is visible light with a wavelength of 400 - 500 nm, and the second wavelength signal is infrared light with a wavelength of 1.5 μm. The photodetector outputs corresponding current signals respectively. An analog-to-digital converter samples the output current signals of the photodetector at a sampling frequency of 1 MHz to obtain the digital voltage values of the first wavelength signal and the second wavelength signal, which are 2.5 V and 3.2 V respectively. The optical power value is calculated based on the digital voltage value, using the formula P = k·V 2, where k is the optoelectronic conversion coefficient. The calculated power value of the first wavelength signal is 6.25 mW, and the power value of the second wavelength signal is 10.24 mW. By comparing the power values of the two signals, the power difference is calculated to be 3.99 mW, obtaining the power difference data. If the power difference data exceeds the preset threshold of 2 mW, the power balance algorithm is triggered, and the PID control algorithm is used to generate a modulator drive signal adjustment instruction. For example, the drive voltage of the first wavelength signal is increased by 0.5 V. According to the adjustment instruction, the interference arm drive signal of the dual-channel Mach-Zehnder modulator in the optical modulation module is modified, and the modulation intensity of the first wavelength signal is increased by 20%, obtaining an updated composite optical signal. The updated composite optical signal is demultiplexed by the dual-channel output module, and the demultiplexer is used to separate the composite optical signal into a new first wavelength signal and a second wavelength signal, which are output to the photodetector. The photodetector is used to detect the new first wavelength signal and the second wavelength signal again, converting them into new electrical signals, and obtaining the updated digital voltage values, which are 3.0 V and 3.2 V respectively. The power difference data is recalculated according to the updated digital voltage values, and the power difference is calculated to be 1.44 mW using the same formula. It is determined that the power difference is within the preset threshold of 2 mW, and a monitoring result is generated.

[0083] According to the power difference data, the feedback control module is used to adjust the drive signal of the optical modulation module to obtain an optimized dual-channel modulation signal.

[0084] (1) Obtain the power data of the first wavelength signal and the second wavelength signal output by the dual-channel output module through an optical detector to obtain real-time power values. (2) According to the real-time power values, calculate the power difference data between the first wavelength signal and the second wavelength signal to determine the power difference value. (3) If the power difference value exceeds the preset threshold, generate an adjustment signal through the feedback control module to obtain the initial drive signal correction parameter. (4) According to the initial drive signal correction parameter, adjust the interference arm voltage of the dual-channel Mach-Zehnder modulator in the optical modulation module to obtain a preliminary modulation signal. (5) Output the preliminary modulation signal to the dual-channel output module through the optical modulation module, obtain the power of the separated first wavelength and second wavelength signals, and judge the new power difference. (6) If the new power difference still exceeds the preset threshold, the feedback control module iteratively updates the drive signal correction parameter to determine the optimized drive signal parameter. (7) According to the optimized drive signal parameter, adjust the bias voltage of the quantum well structure of the electro-absorption modulator array in the optical modulation module to obtain an optimized dual-channel modulation signal. (8) Separate the optimized dual-channel modulation signal through the demultiplexer of the dual-channel output module to obtain the final power data of the first wavelength signal and the second wavelength signal, and judge the power balance state. (9) According to the power balance state, the feedback control module stores the current drive signal parameter through the feedback control module to obtain a stable dual-channel modulation signal output.

[0085] Exemplarily, power data of a first wavelength signal and a second wavelength signal output by a dual-channel output module is acquired by a photodetector. For example, the power of the first wavelength signal is 10 mW and the power of the second wavelength signal is 8 mW, obtaining real-time power values. According to the real-time power values, power difference data between the first wavelength signal and the second wavelength signal is calculated. For example, the power difference value is 2 mW, determining the power difference value. If the power difference value exceeds a preset threshold, for example, the preset threshold is 1 mW, an adjustment signal is generated by a feedback control module, and an initial drive signal correction parameter is obtained. For example, the adjustment voltage is 0.5 V. According to the initial drive signal correction parameter, the interference arm voltages of a dual-channel Mach-Zehnder modulator in an optical modulation module are adjusted. For example, the first interference arm voltage is adjusted from 2 V to 2.5 V, obtaining a preliminary modulation signal. The preliminary modulation signal is output to the dual-channel output module through the optical modulation module, and the separated first wavelength and second wavelength signal powers are acquired. For example, the power of the first wavelength signal is 9.8 mW and the power of the second wavelength signal is 9.2 mW, determining that the new power difference is 0.6 mW. If the new power difference still exceeds the preset threshold, the drive signal correction parameter is iteratively updated by the feedback control module. For example, the adjustment voltage is optimized from 0.5 V to 0.3 V, determining the optimized drive signal parameter. According to the optimized drive signal parameter, the bias voltage of a quantum well structure of an electro-absorption modulator array in the optical modulation module is adjusted. For example, the first quantum well bias voltage is adjusted from 1 V to 1.3 V, obtaining an optimized dual-channel modulation signal. The optimized dual-channel modulation signal is separated by a demultiplexer of the dual-channel output module, and the final first wavelength signal and second wavelength signal power data are acquired. For example, the power of the first wavelength signal is 10 mW and the power of the second wavelength signal is 9.9 mW, determining the power balance state. According to the power balance state, the current drive signal parameter is stored by the feedback control module. For example, the first interference arm voltage of 2.3 V and the first quantum well bias voltage of 1.3 V are stored, obtaining a stable dual-channel modulation signal output.

[0086] The optimized dual-channel modulation signal is output to an external optical communication system to complete dual-channel optical communication.

[0087] The first light source module emits an optical signal with a first wavelength through an external power supply, and transmits it to the input end of the mode multiplexing module through the first optical waveguide, obtaining stable transmission of the optical signal with the first wavelength. The second light source module emits an optical signal with a second wavelength through an external power supply, and transmits it to the other input end of the mode multiplexing module through the second optical waveguide, obtaining stable transmission of the optical signal with the second wavelength. The mode multiplexing module performs mode multiplexing technology processing on the optical signal with the first wavelength and the optical signal with the second wavelength, obtaining a composite optical signal output by a single optical waveguide. The optical modulation module performs intensity modulation, phase modulation or polarization modulation on the composite optical signal based on the electro-optic effect or thermo-optic effect, obtaining a dual-channel modulation signal. If the optical modulation module uses a dual-channel Mach-Zehnder modulator, the driving signals of the first channel and the second channel are respectively loaded through two independently modulated interference arms, obtaining a modulated dual-channel signal; if an electro-absorption modulator array is used, two independent quantum well structures are respectively corresponding to dual-wavelength modulation, obtaining a modulated dual-channel signal; if a ring resonator modulator is used, selective modulation of the dual channels is achieved through resonance wavelength matching, obtaining a modulated dual-channel signal. The wavelength of the modulated composite optical signal is separated by the demultiplexer of the dual-channel output module, obtaining independent first wavelength signal and second wavelength signal. The arrayed waveguide grating accurately separates the dual-channel signal according to the wavelength difference, obtaining the separated dual-channel signal. The separated dual-channel signal is coupled to an external optical fiber through a tapered coupling structure with a tapered waveguide, and the end face tilt angle is 5°-15°, obtaining a coupling signal with low reflection loss. The coupled signal is received by an external optical communication system to complete dual-channel optical communication, obtaining dual-channel communication data.

[0088] Exemplarily, the first light source module uses a 1550 nm DFB laser, externally connected to a 3V DC power supply, and is transmitted to the left input end of the Y-branch coupler of the mode multiplexing module in TE mode through a silicon nitride optical waveguide with a width of 1.5 μm, and the waveguide loss is controlled below 0.2 dB / cm. The second light source module uses a 1310 nm FP laser, externally connected to a 3.5V bias voltage, and is transmitted to the right input end of the Y-branch coupler through a second optical waveguide with the same structure. The two optical signals achieve a coupling efficiency of 98% through mode field matching in the coupler. The mode multiplexing module uses a multimode interference coupler with a length of 50 μm and a width of 10 μm to multiplex the 1550 nm and 1310 nm optical signals into a single output waveguide, and the crosstalk suppression is better than -30 dB. The optical modulation module selects a dual-channel Mach-Zehnder modulator, and its two arms are respectively loaded with 5Vpp differential electrical signals encoded with 10Gbps NRZ, and π / 2 phase modulation is achieved through the linear electro-optic effect of the lithium niobate waveguide, and the modulation depth reaches 90%. If an electro-absorption modulator array is used, the thickness of the InGaAsP quantum well layer is set to 10 nm, and an extinction ratio of 20 dB is achieved when a reverse bias voltage of 2V is applied. The ring resonator modulator has a set radius of 20 μm and a Q value > 10000, and the resonance peak is aligned with 1550 nm / 1310 nm through thermal tuning. The dual-channel output module uses a 32-channel arrayed waveguide grating with a wavelength interval of 0.8 nm and a diffraction angle of 15° to separate the composite signal into two independent signals of 1550.12 nm and 1310.06 nm. The width of the output end of the tapered coupling structure tapers from 3 μm to 0.5 μm, and the tilt angle is set to 8°. After alignment with a single-mode fiber, the reflection loss is lower than -50 dB. The responsivity of the PIN detector of the external optical communication system is 0.8 A / W, and a 25GBaud PAM4 signal demodulation is completed in cooperation with a DSP chip.

[0089] It should be noted that for the method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the embodiments of the present invention are not limited by the described action sequence, because according to the embodiments of the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0090] In some embodiments of the present application, a multimodal dual-channel optical communication integrated device is also disclosed. The integrated device is used to execute the above method, and the integrated device includes:

[0091] An integrated light source for sequentially integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module through the surface of the buffer layer, wherein the buffer layer is disposed on a substrate;

[0092] An optical transmission unit, configured to emit an optical signal of a first wavelength through the first light source module and transmit it to the mode multiplexing module; and emit an optical signal of a second wavelength through the second light source module and transmit it to the mode multiplexing module;

[0093] An optical combining unit, configured to combine the optical signal of the first wavelength and the optical signal of the second wavelength into a combined optical signal through the mode multiplexing module;

[0094] An optical modulation unit, configured to modulate the combined optical signal through the optical modulation module to obtain a dual-channel modulation signal;

[0095] An optical output unit, configured to separate the dual-channel modulation signal into an independent first-wavelength signal and a second-wavelength signal through the dual-channel output module and output them to an external optical communication system.

[0096] For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the related parts, please refer to the corresponding descriptions in the method embodiments.

[0097] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. And the collection, use, and processing of the relevant data need to comply with the relevant laws, regulations, and standards of the relevant countries and regions, and corresponding operation entrances are provided for the user to choose to authorize or refuse.

[0098] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, please refer to each other.

[0099] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a device, or a computer program product. Therefore, the embodiments of the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0100] Embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing terminal devices generate means for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or multiple blocks.

[0101] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or multiple blocks.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, such that a series of operation steps are executed on the computer or other programmable terminal device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable terminal device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or multiple blocks.

[0103] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0104] Finally, it should also 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 thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the above element.

[0105] The above has introduced in detail the method and apparatus for game voice generation, electronic device, and storage medium provided. In this text, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for realizing multimodal dual-channel optical communication, characterized in that, Including: Integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module in sequence through the surface of a buffer layer, wherein the buffer layer is disposed on a substrate; Emitting an optical signal with a first wavelength through the first light source module and transmitting it to the mode multiplexing module; and emitting an optical signal with a second wavelength through the second light source module and transmitting it to the mode multiplexing module; Combining the optical signal with the first wavelength and the optical signal with the second wavelength into a composite optical signal through the mode multiplexing module; Modulating the composite optical signal through the optical modulation module to obtain a dual-channel modulation signal; Separating the dual-channel modulation signal into an independent first-wavelength signal and a second-wavelength signal through the dual-channel output module and outputting them to an external optical communication system.

2. The method according to claim 1, wherein The emitting an optical signal with a first wavelength through the first light source module and transmitting it to the mode multiplexing module includes: Generating a first optical signal with a wavelength of visible light or ultraviolet light through a gallium nitride-based semiconductor laser as the first light source module; Transmitting the first optical signal to the input end of the mode multiplexing module through a first optical waveguide; The emitting an optical signal with a second wavelength through the second light source module and transmitting it to the mode multiplexing module includes: Receiving the pump light of the first light source module and generating a second optical signal in the infrared band through an erbium-doped gallium nitride optical amplifier as the second light source module; Transmitting the second optical signal to the other input end of the mode multiplexing module through a second optical waveguide.

3. The method according to claim 1, wherein The combining the optical signal with the first wavelength and the optical signal with the second wavelength into a composite optical signal through the mode multiplexing module includes: Using a directional coupler, a multimode interference coupler, or a Bragg grating filter as the mode multiplexing module; If the directional coupler is adopted, realizing the mode superposition of the optical signal with the first wavelength and the optical signal with the second wavelength through a symmetric or asymmetric waveguide; If the multimode interference coupler is adopted, realizing the mode multiplexing of the optical signal with the first wavelength and the optical signal with the second wavelength through the self-imaging effect of a multimode waveguide; If the Bragg grating filter is adopted, selectively coupling the optical signal with the first wavelength and the optical signal with the second wavelength through periodic refractive index modulation.

4. The method according to claim 1, wherein The modulating the composite optical signal through the optical modulation module to obtain a dual-channel modulation signal includes: Using a dual-channel Mach-Zehnder modulator, an electro-absorption modulator array, or a ring resonator modulator as the optical modulation module; If the dual-channel Mach-Zehnder modulator is adopted, respectively loading drive signals of a first channel and a second channel through two independently modulated interference arms; If the electro-absorption modulator array is adopted, modulating the optical signal with the first wavelength and the optical signal with the second wavelength respectively through two groups of independent quantum well structures; If the ring resonator modulator is adopted, realizing the selective modulation of the first channel and the second channel through resonance wavelength matching.

5. The method according to claim 4, wherein The using a dual-channel Mach-Zehnder modulator as the optical modulation module includes: A length difference is set between two interference arms of the dual-channel Mach-Zehnder modulator, and the length difference satisfies the formula: ΔL = c / (2nΔf), where ΔL represents the length difference between the two interference arms, c represents the speed of light, n represents the effective refractive index of the waveguide, and Δf represents the dual-channel frequency interval; The crosstalk between the first channel and the second channel is suppressed by the length difference; By applying drive signals to the two interference arms respectively, a dual-channel modulation signal is generated.

6. The method according to claim 1, wherein The dual-channel output module separates the dual-channel modulation signal into independent first-wavelength signal and second-wavelength signal and outputs them to an external optical communication system, including: Using an arrayed waveguide grating, a polarization beam splitter or a tapered coupling structure as the dual-channel output module; If the arrayed waveguide grating is used, the dual-channel modulation signal is separated by wavelength difference; If the polarization beam splitter is used, the dual-channel modulation signal in orthogonal polarization states is separated by a birefringent waveguide; If the tapered coupling structure is used, the separated first-wavelength signal and second-wavelength signal are coupled to an external optical fiber through a tapered waveguide, and the end face tilt angle of the tapered coupling structure is a preset angle to reduce reflection loss.

7. The method according to claim 1, wherein Integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module and a dual-channel output module on the surface of the buffer layer in sequence, including: Using sapphire, silicon carbide or silicon as the substrate; By using a gallium aluminum nitride graded layer as the buffer layer, the composition of the gallium aluminum nitride graded layer is Al x Ga 1-x N, where x satisfies 0 < x ≤ 1; By setting the thickness of the buffer layer within a preset range to reduce lattice mismatch; Growing the buffer layer on the substrate and integrating the first light source module, the second light source module, the mode multiplexing module, the optical modulation module and the dual-channel output module on the surface of the buffer layer in sequence.

8. The method according to claim 1, wherein The optical modulation module modulates the composite optical signal to obtain a dual-channel modulation signal, including: Using a nested ring resonator as the optical modulation module; Generating optical signals of the first wavelength and the second wavelength with different polarization states through a sub-wavelength grating structure; Converting the polarization states of the optical signal of the first wavelength and the optical signal of the second wavelength into the same polarization state through a polarization beam splitter rotator; Thermally tuning the resonance wavelength of the nested ring resonator to separate the first channel and the second channel; Integrating a dual-channel photodetector to monitor the power difference between the first channel and the second channel in real time and perform feedback control.

9. A multimodal dual-channel optical communication integrated device, characterized in that, The integrated device is used to implement the method according to any one of claims 1 to 8 above, and the integrated device includes: An integrated light source, integrating a first light source module, a second light source module, a mode multiplexing module, an optical modulation module and a dual-channel output module on the surface of a buffer layer in sequence, wherein the buffer layer is disposed on a substrate; An optical transmission unit, emitting an optical signal of the first wavelength from the first light source module and transmitting it to the mode multiplexing module; and emitting an optical signal of the second wavelength from the second light source module and transmitting it to the mode multiplexing module; An optical combining unit, combining the optical signal of the first wavelength and the optical signal of the second wavelength into a composite optical signal through the mode multiplexing module; An optical modulation unit that modulates the composite optical signal through the optical modulation module to obtain a dual-channel modulation signal; An optical output unit that separates the dual-channel modulation signal into an independent first-wavelength signal and a second-wavelength signal through the dual-channel output module and outputs them to an external optical communication system.

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