A multimode dual-channel optical communication integrated device and implementation method

Abstract

The embodiment of the present application provides a kind of multimode dual-channel optical communication integrated device and implementation method, comprising: by buffer layer surface successively integrated first light source module, second light source module, mode multiplexing module, optical modulation module and dual-channel output module;By first light source module, first wavelength optical signal is sent and is transmitted to mode multiplexing module;By second light source module, second wavelength optical signal is sent and is transmitted to mode multiplexing module;By mode multiplexing module, first wavelength optical signal is combined with second wavelength optical signal as composite optical signal;By optical modulation module, composite optical signal is modulated to obtain dual-channel modulation signal;By dual-channel output module, dual-channel modulation signal is separated into independent first wavelength signal and second wavelength signal and is output to external optical communication system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of information technology, and in particular to a multi-modal dual-channel optical communication integrated device and implementation method. BACKGROUND

[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 two different wavelength optical signals on a single integrated photonic chip while ensuring signal quality and system stability. This involves the precise design and integration of multiple optical elements such as light sources, waveguides, and couplers. Secondly, during the modulation process of dual-channel signals, how to ensure modulation efficiency while achieving precise frequency spacing and phase control between the two channels is also a key problem. This requires consideration of the structure design of Mach-Zehnder modulators and precise control of driving signals. Furthermore, the separation and detection of dual-channel signals also face 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, the temperature stability, power consumption control, and compatibility with external fiber networks of the entire system also need to be considered. These technical difficulties are interrelated and collectively constitute the core challenge of realizing a high-performance, reliable, and stable dual-channel optical communication system. SUMMARY

[0003] In view of the above problems, a multi-modal dual-channel optical communication integrated device and implementation method are proposed to overcome the above problems 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, comprising:

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

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

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

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

[0009] The dual-channel output module separates the dual-channel modulation signal into independent first and second wavelength signals and outputs them to an external optical communication system.

[0010] Further, the first light source module emits a first wavelength light signal and transmits it to the mode multiplexing module, including:

[0011] The first light source module is a gallium nitride-based semiconductor laser, which generates a first light signal with a wavelength of visible light or ultraviolet light;

[0012] The first light signal is transmitted to the input end of the mode multiplexing module through a first optical waveguide;

[0013] The second light source module emits a second wavelength light signal and transmits it to the mode multiplexing module, including:

[0014] The second light source module is an erbium-doped gallium nitride optical amplifier, which receives pump light from the first light source module and generates a second light signal in the infrared band;

[0015] The second light signal is transmitted to the other input end of the mode multiplexing module through a second optical waveguide.

[0016] Further, the mode multiplexing module combines the first and second wavelength light signals into a composite light signal, including:

[0017] The mode multiplexing module is a directional coupler, a multimode interference coupler, or a Bragg grating filter;

[0018] If the directional coupler is used, the mode superposition of the first and second wavelength light signals is achieved through symmetric or asymmetric waveguides;

[0019] If the multimode interference coupler is used, the mode multiplexing of the first and second wavelength light signals is achieved through the self-imaging effect of the multimode waveguide;

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

[0021] Further, the optical modulation module modulates the composite light signal to obtain a dual-channel modulation signal, including:

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

[0023] If the dual-channel Mach-Zehnder modulator is used, the driving signals of the first channel and the second channel are loaded on two independent interference arms respectively through interference;

[0024] If the electro-absorption modulator array is used, the light signals of the first wavelength and the second wavelength are modulated through two independent quantum well structures respectively;

[0025] If the ring resonator modulator is used, the selective modulation of the first channel and the second channel is realized through resonant wavelength matching.

[0026] Further, the dual-channel Mach-Zehnder modulator is used as the optical modulation module, including:

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

[0028] ΔL=c / (2nΔf), wherein ΔL represents the length difference of 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;

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

[0030] The dual-channel modulation signal is generated by applying driving signals on the two interference arms respectively.

[0031] Further, the dual-channel output module is used to separate the dual-channel modulation signal into independent first wavelength signal and second wavelength signal and output to the external optical communication system, including:

[0032] The arrayed waveguide grating, the polarization beam splitter or the tapered coupling structure is used as the dual-channel output module;

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

[0034] If the polarization beam splitter is used, the dual-channel modulation signal in orthogonal polarization states is separated through birefringent waveguide;

[0035] If the tapered coupling structure is used, the first wavelength signal and the second wavelength signal after separation are coupled to the external optical fiber through the tapered waveguide, and the end face inclination angle of the tapered coupling structure is a preset angle to reduce the reflection loss.

[0036] Further, the first light source module, the second light source module, the mode multiplexing module, the optical modulation module and the dual-channel output module are integrated on the surface of the buffer layer in sequence, including:

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

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

[0039] a thickness of the buffer layer is set to a preset range to reduce lattice mismatch;

[0040] the buffer layer is grown on the substrate, and the first light source module, the second light source module, the mode multiplexing module, the light modulation module and the dual-channel output module are integrated on the surface of the buffer layer in sequence.

[0041] Further, the modulation of the composite light signal by the light modulation module to obtain a dual-channel modulation signal comprises:

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

[0043] a subwavelength grating structure to generate the first wavelength light signal and the second wavelength light signal with different polarization states;

[0044] a polarization beam splitting rotator to convert the polarization states of the first wavelength light signal and the second wavelength light signal into the same polarization state;

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

[0046] integrated dual-channel photodetectors to monitor the power difference of the first channel and the second channel in real time and perform feedback control.

[0047] In an embodiment of the present application, a multi-modal dual-channel optical communication integrated device is also disclosed, which is used to implement the above method, and comprises:

[0048] an integrated light source, which comprises a first light source module, a second light source module, a mode multiplexing module, a light modulation module and a dual-channel output module integrated on the surface of the buffer layer in sequence, wherein the buffer layer is arranged on a substrate;

[0049] a light transmission unit, which emits a first wavelength light signal by the first light source module and transmits the first wavelength light signal to the mode multiplexing module, and emits a second wavelength light signal by the second light source module and transmits the second wavelength light signal to the mode multiplexing module;

[0050] a light combination unit, which combines the first wavelength light signal and the second wavelength light signal into a composite light signal by the mode multiplexing module;

[0051] a light modulation unit, which modulates the composite optical signal by the light modulation module to obtain a dual-channel modulation signal;

[0052] a light output unit, which separates the dual-channel modulation signal into independent first and second wavelength signals by the dual-channel output module and outputs to an external optical communication system.

[0053] Embodiments of the present application have the following advantages:

[0054] By integrating multiple optical modules on a substrate, generation, multiplexing, modulation and separation of dual-wavelength optical signals are achieved. The present application 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, wherein the length difference of the two arms satisfies a specific formula to achieve a dual-channel frequency interval. The modulation signal is separated and coupled to an external optical fiber by an arrayed waveguide grating, while the integrated photodetector is used to monitor the channel power difference of the output signal in real time, and the feedback control module is used to dynamically adjust the driving signal to optimize the dual-channel modulation effect. The present application realizes efficient 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. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0056] Figure 1 A flowchart of a multimodal dual-channel optical communication integrated device of the present application. DETAILED DESCRIPTION

[0057] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the following will further describe the present application in detail with reference to the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0058] Reference Figure 1 , a flowchart of steps of a multimodal dual-channel optical communication implementation method provided by some embodiments of the present application is shown, which can specifically include:

[0059] S101, sequentially integrating a first light source module, a second light source module, a mode multiplexing module, a light modulation module and a dual-channel output module on the buffer layer surface, wherein the buffer layer is arranged on a substrate;

[0060] Sapphire, silicon carbide or silicon is used as a substrate material, Al x Ga 1- x N gradient layer, the thickness is 1-5 μm, and a buffer layer with low lattice mismatch is obtained. According to the surface characteristics of the buffer layer, GaN-based materials are sequentially deposited on the buffer layer by a molecular beam epitaxy technology to form a semiconductor laser structure of the first light source module, so that visible light or ultraviolet light with an output wavelength of 400-500 nm is determined. By using erbium-doped GaN material, a light amplifier structure of the second light source module is formed on the buffer layer through photolithography and etching process, the pump light excitation of the first light source module is obtained, and an optical signal with a wavelength of 1.5 μm is obtained. Through optical waveguide design software simulation, the geometric structure of the first optical waveguide and the second optical waveguide is generated, and the optical waveguide is made on the buffer layer by using plasma-enhanced chemical vapor deposition method, so that the optical signal is determined to be transmitted to the input end of the mode multiplexing module. If the mode multiplexing module selects an arrayed waveguide grating, the first wavelength and the second wavelength signals are separated through wavelength difference; if a polarization beam splitter is selected, the orthogonal polarization state signals are separated through a birefringent waveguide; if a tapered coupling structure is selected, the signals are coupled through a tapered waveguide and a 5°-15° end face tilt angle, and a composite optical signal output by a single optical waveguide is obtained. According to the characteristics of the composite optical signal, the electric-optic effect or the thermo-optic effect is used, an electric field or a thermal field is applied in the light modulation module, the intensity, phase or polarization of the composite optical signal is modulated, and a dual-channel modulation signal is generated. The dual-channel modulation signal is obtained, the waveguide structure is optimized through waveguide design software, the waveguide is made through photolithography technology, the modulated composite optical signal is separated into independent first wavelength signal and second wavelength signal, and the wavelength purity of the separated signal is determined. Through the simulation design of the tapered optical waveguide or the optical fiber array, the output structure is made by using precise photolithography and etching process, the separated first wavelength signal and second wavelength signal are coupled to the external optical communication system, and high-efficiency optical signal output is obtained. According to the intensity and wavelength characteristics of the output optical signal, the signal is detected by a spectrum analyzer and a power meter, whether the signal meets the transmission requirements of the external optical communication system is judged, and the final performance verification data is generated.

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

[0062] For example, sapphire is used as a substrate material, Al x Ga 1-xN gradual layer, the thickness is 3 μm, get the buffer layer with low lattice mismatch. According to the surface characteristics of the buffer layer, by molecular beam epitaxy technology on the buffer layer is deposited in turn GaN based material, form the first light source module of semiconductor laser structure, determine the output wavelength of 450 nm visible light. Using doped erbium GaN material, through lithography and etching process on the buffer layer to form the second light source module of optical amplifier structure, get the first light source module pump light excitation, get 1.5 μm wavelength of optical signal. Through the optical waveguide design software simulation, generate the first optical waveguide and the second optical waveguide geometry, using plasma enhanced chemical vapor deposition method on the buffer layer to make optical waveguide, determine the optical signal transmission to the input end of the mode multiplexing module. If the mode multiplexing module selects arrayed waveguide grating, then through the wavelength difference separation 450 nm and 1.5 μm signal; If the selection of polarization beam splitter, then through the birefringent waveguide separation orthogonal polarization state signal; If the selection of tapered coupling structure, then through the tapered waveguide and 10° end face tilt angle coupling signal, get the single optical waveguide output composite optical signal. According to the characteristics of the composite optical signal, using electro-optic effect, by applying electric field in the optical modulation module, the intensity modulation of composite optical signal, generate dual channel modulation signal. Get dual channel modulation signal, through the waveguide design software optimization waveguide structure, using lithography technology to make waveguide, the composite optical signal after modulation is separated into independent 450 nm signal and 1.5 μm signal, determine the wavelength purity of the separated signal. Through the simulation design of tapered optical waveguide, using precision lithography and etching process to make output structure, the separated 450 nm signal and 1.5 μm signal coupled to the external optical communication system, get high efficiency optical signal output. According to the intensity and wavelength characteristics of the output optical signal, through the spectrum analyzer and power meter detection, judge whether the signal meets the transmission requirements of the external optical communication system, generate the final performance verification data.

[0063] S102, through the first light source module emits first wavelength of optical signal and transmission to the mode multiplexing module; and through the second light source module emits second wavelength of optical signal and transmission to the mode multiplexing module.

[0064] The first light source module is driven by an external power supply, a GaN-based semiconductor laser emits a 400-500nm wavelength optical signal to obtain a first wavelength optical signal. The 400-500nm wavelength optical signal is transmitted through a first optical waveguide, a low-loss optical waveguide structure is used, and the optical signal transmitted to the input end of the mode multiplexing module is obtained. The optical signal transmitted to the input end of the mode multiplexing module is obtained, the TE polarized 400-500nm optical signal is processed by the polarization beam splitting rotator to obtain an optical signal converted into a uniform polarization state. The 400-500nm optical signal in the uniform polarization state is received by the mode multiplexing module, a double-drive electrode Mach-Zehnder structure of the optical modulation module is used, and an initial modulated optical signal is obtained. If the bias voltage of the initial modulated optical signal is within the range of 0-5V, the bias voltage is applied through the Mach-Zehnder structure to obtain a modulated optical signal with a modulation bandwidth of 10GHz. The intensity of the modulated optical signal is modulated by the optical modulation module, and a double-channel modulated signal is obtained based on the electro-optic effect processing. The double-channel modulated signal is obtained, the 400-500nm wavelength optical signal is separated by the waveguide of the double-channel output module, and an independent first wavelength signal is obtained. The independent first wavelength signal is transmitted through a tapered optical waveguide, an arrayed waveguide grating structure is used, and an output signal with a channel spacing of 200GHz is obtained. The output signal is temperature-controlled by a thermoelectric cooler, a control algorithm with a temperature control accuracy of ±0.1℃ is used, and a first wavelength output signal with a stable wavelength is obtained.

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

[0066] The second light source module is externally connected to a power supply to emit a second wavelength optical signal, which is transmitted to another input end of the mode multiplexing module through a second optical waveguide.

[0067] The second light source module is powered by an external power supply to activate the erbium-doped GaN optical amplifier to obtain excited-state erbium ions. The pump light of the first light source module is input into the erbium-doped GaN optical amplifier to excite the erbium ions to jump to a high energy level to obtain a 1.5 μm wavelength optical signal. The 1.5 μm wavelength optical signal is amplified by the optical resonant cavity inside the second light source module to determine a stable optical signal output. The amplified 1.5 μm wavelength optical signal is obtained and transmitted to the second optical waveguide to obtain an optical signal stream of the direction mode multiplexing module. According to the refractive index and geometric structure of the second optical waveguide, the transmission efficiency of the optical signal is optimized, and it is determined that the loss of the optical signal is lower than a preset threshold. If the optical signal loss is lower than the preset threshold, the 1.5 μm wavelength optical signal is transmitted to the input end of the mode multiplexing module through the second optical waveguide to obtain a stable input signal. The polarization beam splitter rotator of the mode multiplexing module receives the 1.5 μm wavelength optical signal transmitted by the second optical waveguide to determine the polarization state compatibility with the first light source signal. The 1.5 μm wavelength optical signal is combined with the 400-500 nm wavelength optical signal of the first light source through the mode multiplexing module to obtain a composite optical signal of a single optical waveguide. The composite optical signal is obtained and transmitted to the optical modulation module to determine that the intensity and phase of the composite optical signal meet the modulation requirements.

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

[0069] S103, combine the first wavelength optical signal and the second wavelength optical signal into a composite optical signal by the mode multiplexing module, specifically, the mode multiplexing module can be used to combine the first wavelength and the second wavelength optical signal into a single optical waveguide output by an asymmetric directional coupler, and a composite optical signal is obtained.

[0070] The first wavelength optical signal output by the first light source module is obtained, transmitted to the first input end of the asymmetric directional coupler through the first optical waveguide, and waveguide transmission data of the first wavelength optical signal is obtained. The second wavelength optical signal output by the second light source module is obtained, transmitted to the second input end of the asymmetric directional coupler through the second optical waveguide, and waveguide transmission data of the second wavelength optical signal is obtained. According to the waveguide structure parameters of the asymmetric directional coupler, the coupling coefficients of the first wavelength optical signal and the second wavelength optical signal are calculated, and the initial composite optical signal of mode superposition is determined. The phase matching conditions of the first wavelength optical signal and the second wavelength optical signal are adjusted through the waveguide length and the refractive index distribution of the asymmetric directional coupler, and the optimized composite optical signal is obtained. If the power distribution of the composite optical signal meets the preset threshold, the composite optical signal is output through the single optical waveguide, and stable multiplexed optical signal data is obtained. According to the electro-optic effect parameters of the optical modulation module, the intensity of the multiplexed optical signal is modulated, and the preliminary data of the dual-channel modulation signal is obtained. The polarization state of the dual-channel modulation signal is adjusted through the polarization modulation function of the optical modulation module, and the modulation signal conforming to the communication protocol is obtained. The waveguide parameters of the dual-channel output module are obtained, the modulated composite optical signal is separated into independent first wavelength signal and second wavelength signal, and the separated signal data is determined. The separated first wavelength signal and second wavelength signal are transmitted to the external optical communication system through the geometric parameter optimization of the tapered optical waveguide, and the final communication output signal is obtained.

[0071] Exemplarily, the first light source module adopts a GaN-based semiconductor laser, outputs a visible light signal of 450 nm wavelength, and transmits the visible light signal to the first input end of the asymmetric directional coupler through a first optical waveguide with a width of 1.5 μm. The transmission loss of the optical waveguide is controlled within 0.2 dB / cm. The second light source module adopts an erbium-doped GaN optical amplifier, outputs a light signal of 1.5 μm wavelength after receiving 450 nm pump light, and transmits the light signal to the second input end of the asymmetric directional coupler through a second optical waveguide with a width of 2 μm. The waveguide group refractive index is set to 3.4. The waveguide spacing of the asymmetric directional coupler is designed to be 0.8 μm. The coupling coefficient of the TE mode is calculated to be 0.25 dB / μm by using the finite element method, and the initial power ratio of the combined light signal 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 realized, and the crosstalk of the combined light signal is reduced to below -30 dB. An optoelectronic detector is used to monitor the power of the combined light signal. When the power of the main mode reaches 5 mW and the side mode suppression ratio is greater than 20 dB, a single optical waveguide is triggered to output. A light modulation module is loaded with a 10 Gbps NRZ electrical signal, and the combined light signal is intensity-modulated by using the electro-optic coefficient r33 = 30 pm / V of a lithium niobate waveguide. The modulation depth reaches 90%. By adjusting the polarization angle of the dual-channel modulation signal to 45° by using an integrated polarization controller, the polarization multiplexing requirement of coherent communication is met. A waveguide grating array structure is used as a splitter, and the channel spacing is 100 nm. The isolation degree 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 a single-mode fiber array. The coupling efficiency is improved to more than 95%.

[0072] S104, modulating the combined light signal by the light modulation module to obtain a dual-channel modulation signal; specifically, intensity-modulating or phase-modulating the combined light signal by the light modulation module based on a dual-channel Mach-Zehnder modulator to obtain a dual-channel modulation signal, wherein the length difference of two arms satisfies the formula ΔL = c / (2nΔf), Δf is a dual-channel frequency interval, n is an effective refractive index of a waveguide, and c is the speed of light.

[0073] The first wavelength light signal emitted by the first light source module and the second wavelength light signal emitted by the second light source module are obtained, transmitted to the input end of the mode multiplexing module through the first optical waveguide and the second optical waveguide, and the input signal of the multiplexing module is obtained. The first wavelength light signal and the second wavelength light signal are combined into a single optical waveguide output by the mode multiplexing module through the mode multiplexing technology, and a composite optical signal is obtained. The composite optical signal is received by the double-channel Mach-Zehnder modulator in the optical modulation module and is distributed to two independent modulation interference arms, and the split optical signal is obtained. The double-channel frequency interval Δf and the waveguide effective refractive index n are obtained, the length difference ΔL of the two arms is calculated, and the formula ΔL=c / (2nΔf) is used, wherein c is the speed of light, and the length difference of the two arms satisfying the phase modulation condition is obtained. According to the calculated ΔL, the physical length of the two interference arms in the double-channel Mach-Zehnder modulator is adjusted, and the modulator structure meeting the design requirements is obtained. The driving signals of the first channel and the second channel are loaded into the two interference arms of the double-channel Mach-Zehnder modulator respectively, the intensity modulation or phase modulation is performed on the split optical signal, and the modulated interference signal is obtained. The modulated interference signal is combined through the output end of the Mach-Zehnder modulator, and a double-channel modulation signal is obtained. The double-channel modulation signal is separated into independent first wavelength signal and second wavelength signal through the wave divider of the double-channel output module, and the separated double-channel signal is obtained. The separated double-channel signal is coupled to the external optical communication system through the tapered optical waveguide or the optical fiber array, the end face inclination angle is controlled at 5°-15°, and the final output optical communication signal is obtained.

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

[0075] S105, separate the dual-channel modulated signal into independent first wavelength signal and second wavelength signal through the dual-channel output module and output to an external optical communication system, specifically, through the dual-channel output module, the arrayed waveguide grating is adopted to separate the dual-channel modulated signal into independent first wavelength signal and second wavelength signal.

[0076] The dual-channel modulation signal output by the light modulation module is received by the dual-channel output module to obtain composite optical signal data. The arrayed waveguide grating is used to perform wavelength spectrometry on the composite optical signal to separate the first wavelength signal and the second wavelength signal. According to the wavelength difference characteristics of the arrayed waveguide grating, the spectral distribution of the separated first wavelength signal and the second wavelength signal is determined. The separated first wavelength signal is optimized by the tapered coupling structure to obtain a first wavelength output signal with low reflection loss. The separated second wavelength signal is optimized by the 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 a preset threshold, the intensity is compensated by a signal amplification algorithm to obtain an enhanced first wavelength signal. If the intensity of the second wavelength output signal is lower than a preset threshold, the intensity is compensated by a signal amplification algorithm to obtain an enhanced second wavelength signal. The enhanced first wavelength signal is coupled by the fiber array to determine its output parameters for transmission to an external optical communication system. The enhanced second wavelength signal is coupled by the fiber array to determine its output parameters for transmission to an external optical communication system.

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

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

[0079] The first wavelength signal and the second wavelength signal separated by the double-channel output module are received by a tapered optical waveguide structure to obtain initial optical signal data. The mode field diameter of the optical signal is adjusted according to the geometric parameters of the tapered optical waveguide to obtain an optical signal matching the mode field of an external optical fiber. The first wavelength signal and the second wavelength signal are spectrally separated by a splitter to determine independent optical signal channels. The separated double-wavelength signals are mode superimposed by a directional coupler of a symmetric waveguide structure to obtain a composite optical signal. The taper angle parameter of the tapered optical waveguide is adjusted 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, the signal is polarization corrected by a polarization modulation module to determine a corrected optical signal. The corrected optical signal is coupled to an external optical fiber by a fiber array to obtain an output optical signal. According to the power distribution of the output optical signal, selective coupling is performed by a Bragg grating filter to obtain a stable output optical signal. The stable output optical signal is decoded and processed by an external optical communication system to obtain final double-channel communication data.

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

[0081] The power difference data is obtained by monitoring the channel power difference of the output optical signal in real time through the integrated photodetector. Specifically, the first wavelength signal and the second wavelength signal output by the dual-channel output module are received by the integrated photodetector, and converted into corresponding electrical signals. The electrical signals output by the photodetector are sampled by an analog-to-digital converter to obtain 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, and the optical power data of each channel is obtained. The power difference between the first wavelength signal and the second wavelength signal is calculated by comparing the power values of the first wavelength signal and the second wavelength signal, and the power difference data is obtained. If the power difference data exceeds a preset threshold, the power balancing algorithm is triggered, and a modulator driving signal adjustment instruction is generated. The interference arm driving signal of the dual-channel Mach-Zehnder modulator in the optical modulation module is modified according to the adjustment instruction to change the modulation intensity, and the updated composite optical signal is obtained. The updated composite optical signal is processed by the dual-channel output module to separate into new first wavelength signal and second wavelength signal, and output to the photodetector. The new first wavelength signal and the second wavelength signal are detected again by the photodetector, converted into new electrical signals, and the updated digital voltage values are obtained. The power difference data is recalculated based on the updated digital voltage values, and it is judged whether the power difference is within the preset threshold range to generate a monitoring result.

[0082] For example, the first wavelength signal and the second wavelength signal output by the dual-channel output module are received by the integrated photodetector, and the optical signals are converted 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. The output current signals of the photodetector are sampled by an analog-to-digital converter at a sampling frequency of 1 MHz to obtain 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 values are calculated based on the digital voltage values, and the formula P=k·V 2wherein k is a photoelectric conversion coefficient, the first wavelength signal power value is calculated to be 6.25 mW, and the second wavelength signal power value is calculated to be 10.24 mW. By comparing the power values of the two signals, the power difference data is calculated to be 3.99 mW. If the power difference data exceeds the preset threshold of 2 mW, the power balancing algorithm is triggered, and a modulator driving signal adjustment instruction is generated using a PID control algorithm, for example, the driving voltage of the first wavelength signal is increased by 0.5 V. According to the adjustment instruction, the interference arm driving signal of the dual-channel Mach-Zehnder modulator in the optical modulation module is modified, the modulation intensity of the first wavelength signal is increased by 20%, and the updated composite optical signal is obtained. The updated composite optical signal is processed by the dual-channel output module, and the composite optical signal is separated into a new first wavelength signal and a second wavelength signal by a wave splitter, and output to a photodetector. The new first wavelength signal and the second wavelength signal are detected again by the photodetector, converted into new digital voltage values, and the updated digital voltage values are obtained, which are 3.0 V and 3.2 V, respectively. According to the updated digital voltage values, the power difference data is recalculated, and the power difference is calculated to be 1.44 mW using the same formula. It is judged 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 driving signal of the optical modulation module is adjusted using a feedback control module to obtain an optimized dual-channel modulation signal.

[0084] (1) The power data of the first wavelength signal and the second wavelength signal output by the dual-channel output module is obtained by the optical detector to obtain real-time power values. (2) According to the real-time power values, the power difference data between the first wavelength signal and the second wavelength signal is calculated to determine the power difference value. (3) If the power difference value exceeds the preset threshold, an adjustment signal is generated by the feedback control module to obtain the initial driving signal correction parameter. (4) According to the initial driving signal correction parameter, the interference arm voltage of the dual-channel Mach-Zehnder modulator in the optical modulation module is adjusted to obtain a preliminary modulation signal. (5) The preliminary modulation signal is output to the dual-channel output module by the optical modulation module to obtain the power of the separated first wavelength and second wavelength signals, and the new power difference value is determined. (6) If the new power difference value still exceeds the preset threshold, the driving signal correction parameter is iteratively updated by the feedback control module to determine the optimized driving signal parameter. (7) According to the optimized driving signal parameter, the quantum well structure bias voltage of the electroabsorption modulator array in the optical modulation module is adjusted to obtain an optimized dual-channel modulation signal. (8) The optimized dual-channel modulation signal is separated by the wave splitter of the dual-channel output module to obtain the final power data of the first wavelength signal and the second wavelength signal, and the power balance state is determined. (9) According to the power balance state, the current driving signal parameter is stored by the feedback control module to obtain a stable dual-channel modulation signal output.

[0085] For example, the power data of the first wavelength signal and the second wavelength signal output by the dual-channel output module is acquired by the light detector, for example, the first wavelength signal power is 10 mW, and the second wavelength signal power is 8 mW, to obtain the real-time power value. According to the real-time power value, the power difference data between the first wavelength signal and the second wavelength signal is calculated, for example, the power difference value is 2 mW, and the power difference value is determined. If the power difference value exceeds the preset threshold value, for example, the preset threshold value is 1 mW, an adjustment signal is generated by the feedback control module to obtain an initial driving signal correction parameter, for example, the adjustment voltage is 0.5 V. According to the initial driving signal correction parameter, the interference arm voltage of the dual-channel Mach-Zehnder modulator in the optical modulation module is adjusted, for example, the first interference arm voltage is adjusted from 2 V to 2.5 V, to obtain the preliminary modulation signal. The preliminary modulation signal is output to the dual-channel output module by the optical modulation module, and the power of the separated first wavelength and second wavelength signals is acquired, for example, the first wavelength signal power is 9.8 mW, and the second wavelength signal power is 9.2 mW, and the new power difference value is determined to be 0.6 mW. If the new power difference value still exceeds the preset threshold value, the driving 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, and the optimized driving signal parameter is determined. According to the optimized driving signal parameter, the quantum well structure bias voltage of the 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, to obtain the optimized dual-channel modulation signal. The final first wavelength signal and second wavelength signal power data is acquired by separating the optimized dual-channel modulation signal by the wave separator of the dual-channel output module, for example, the first wavelength signal power is 10 mW, and the second wavelength signal power is 9.9 mW, and the power balance state is determined. According to the power balance state, the current driving signal parameter is stored by the feedback control module, for example, the first interference arm voltage is stored as 2.3 V, and the first quantum well bias voltage is stored as 1.3 V, to obtain the 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 light signals of a first wavelength through an external power supply, which are transmitted to the input end of the mode multiplexing module through the first optical waveguide, to obtain stable transmission of the first wavelength light signals. The second light source module emits light signals of a second wavelength through an external power supply, which are transmitted to the other input end of the mode multiplexing module through the second optical waveguide, to obtain stable transmission of the second wavelength light signals. The mode multiplexing module is used to process the first wavelength light signals and the second wavelength light signals through mode multiplexing technology, to obtain a composite optical signal output by a single optical waveguide. The optical modulation module is used to modulate the composite optical signal through intensity modulation, phase modulation or polarization modulation based on electro-optic effect or thermo-optic effect, to obtain a dual-channel modulation signal. If the optical modulation module is a dual-channel Mach-Zehnder modulator, the first channel and the second channel are loaded with driving signals through two independent modulation interference arms, to obtain the modulated dual-channel signal; if an electro-absorption modulator array is used, two groups of independent quantum well structures are used to correspond to dual-wavelength modulation, to obtain the modulated dual-channel signal; if a ring resonator modulator is used, selective modulation of the dual channels is realized through resonant wavelength matching, to obtain the modulated dual-channel signal. The wavelength separator of the dual-channel output module is used to separate the modulated composite optical signal by wavelength, to obtain independent first wavelength signals and second wavelength signals. The arrayed waveguide grating is used to accurately separate the dual-channel signals according to wavelength differences, to obtain the separated dual-channel signals. The tapered coupling structure is used to couple the separated dual-channel signals to an external optical fiber through a tapered waveguide, the end face inclination angle is 5°-15°, to obtain a coupling signal with low reflection loss. The external optical communication system is used to receive the coupling signal, to complete dual-channel optical communication, and to obtain dual-channel communication data.

[0088] For example, the first light source module uses a 1550 nm DFB laser, and is connected to a 3 V DC power supply. The light is transmitted to the left input end of a Y-shaped coupler of the mode multiplexing module through a silicon nitride optical waveguide with a width of 1.5 μm in a TE mode, and the waveguide loss is controlled to be less than 0.2 dB / cm. The second light source module uses a 1310 nm FP laser, and is connected to a 3.5 V bias voltage. The light is transmitted to the right input end of the Y-shaped coupler through a second optical waveguide with the same structure, and the two light signals are coupled with a coupling efficiency of 98% in the coupler through mode field matching. The mode multiplexing module uses a multimode interference coupler with a length of 50 μm and a width of 10 μm, which multiplexes the 1550 nm and 1310 nm light 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 the two arms of the modulator are loaded with 10 Gbps NRZ encoded 5 Vpp differential electrical signals, respectively. The signals are subjected to π / 2 phase modulation through the linear electro-optic effect of a 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 a reverse bias voltage of 2 V is applied to achieve an extinction ratio of 20 dB. The ring resonator modulator is set to have a radius of 20 μm and a Q value greater than 10,000. The resonant 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°, which separates the combined signal into two independent signals at 1550.12 nm and 1310.06 nm. The output end of the tapered coupling structure gradually shrinks from 3 μm to 0.5 μm, and the tilt angle is set to 8°. After aligning with a single-mode optical fiber, the reflection loss is less than -50 dB. The PIN detector of the external optical communication system has a responsivity of 0.8 A / W, and a DSP chip is used to complete the demodulation of the 25 GBaud PAM4 signal.

[0089] It should be noted that, for the method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the embodiments of the present application are not limited by the order of the described actions, because according to the embodiments of the present application, certain steps can be performed in other orders 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 necessary for the embodiments of the present application.

[0090] In some embodiments of the present application, a multi-modal dual-channel optical communication integrated device is also disclosed, which is used to perform the above method, and the integrated device comprises:

[0091] An integrated light source is used to sequentially 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 through the surface of the buffer layer, wherein the buffer layer is arranged on a substrate.

[0092] a light transmitting unit for transmitting a first wavelength light signal from the first light source module to the mode multiplexing module and transmitting a second wavelength light signal from the second light source module to the mode multiplexing module;

[0093] a light combining unit for combining the first wavelength light signal and the second wavelength light signal into a combined light signal by the mode multiplexing module;

[0094] a light modulating unit for modulating the combined light signal by the light modulating module to obtain a dual-channel modulated signal;

[0095] a light output unit for separating the dual-channel modulated signal into independent first wavelength signal and second wavelength signal by the dual-channel output module and outputting to an external optical communication system.

[0096] For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts are referred to the part of the method embodiment.

[0097] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant national and regional laws, regulations and standards, and provide corresponding operation portal for user to choose authorization or refusal.

[0098] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other.

[0099] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device, or computer program product. Therefore, the embodiments of the present application can be in 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 application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0100] The embodiments of the present application are described with reference to the flowchart illustrations and / or block diagrams of the methods, terminal devices (systems) and computer program products according to the embodiments of the present application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal devices to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal devices, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[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 devices to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal devices, such that a series of operational steps are carried out on the computer or other programmable terminal devices to produce a computer implemented process so that the instructions executed on the computer or other programmable terminal devices provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0103] Although preferred embodiments of the present application have been described, those skilled in the art will be able to make additional modifications and variations to these embodiments without departing from the scope of the present application. Accordingly, the appended claims are intended to encompass all such modifications and variations as falling within the scope of the present application.

[0104] Finally, it needs to be pointed out that in this document, relational terms such as first and second and the like can only be intended to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus including the above element.

[0105] The above provides a detailed introduction to the method and device for generating game voice, electronic equipment and storage medium. The principles and implementation manners of the present application are described by applying specific examples. The above example is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for implementing multimodal dual-channel optical communication, characterized in that, include: 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, wherein the buffer layer is disposed on a substrate; The first light source module emits a light signal of a first wavelength and transmits it to the mode multiplexing module; and the second light source module emits a light signal of a second wavelength and transmits it to the mode multiplexing module. The mode multiplexing module combines the optical signal of the first wavelength and the optical signal of the second wavelength into a composite optical signal. The composite optical signal is modulated by the optical modulation module to obtain a dual-channel modulated signal; The dual-channel output module separates the dual-channel modulated signal into an independent first wavelength signal and a second wavelength signal and outputs them to an external optical communication system. The step of emitting a light signal of a first wavelength through the first light source module and transmitting it to the mode multiplexing module includes: The first light source module uses a gallium nitride-based semiconductor laser to generate a first optical signal with a wavelength of visible or ultraviolet light. The first optical signal is transmitted to the input terminal of the mode multiplexing module through the first optical waveguide; The second light source module emits a second wavelength light signal and transmits it to the mode multiplexing module, including: The second light source module uses a gallium nitride-doped erbium optical amplifier as its second light source module to receive the pump light from the first light source module and generate a second optical signal in the infrared band. The second optical signal is transmitted to another input terminal of the mode multiplexing module via the second optical waveguide.

2. The method according to claim 1, characterized in that, The step of 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 includes: The mode multiplexing module is described using a directional coupler, a multimode interference coupler, or a Bragg grating filter. If the directional coupler is used, the optical signal of the first wavelength and the optical signal of the second wavelength can be superimposed through symmetrical or asymmetrical waveguides; If the multimode interference coupler is used, mode multiplexing of the first wavelength optical signal and the second wavelength optical signal can be achieved through the self-imaging effect of the multimode waveguide; If the Bragg grating filter is used, the optical signal of the first wavelength and the optical signal of the second wavelength are selectively coupled by periodic refractive index modulation.

3. The method according to claim 1, characterized in that, The process of modulating the composite optical signal using the optical modulation module to obtain a dual-channel modulated signal includes: The optical modulation module is described using a dual-channel Mach-Zehnder modulator, an electroabsorption modulator array, or a ring resonant cavity modulator. If the dual-channel Mach-Zehnder modulator is used, the driving signals of the first channel and the second channel are loaded respectively through two independently modulated interferometer arms; If the electroabsorption modulator array is used, the optical signal of the first wavelength and the optical signal of the second wavelength are modulated by two independent quantum well structures respectively; If the ring resonant cavity modulator is used, selective modulation of the first channel and the second channel can be achieved through resonant wavelength matching.

4. The method according to claim 3, characterized in that, The optical modulation module, which uses a dual-channel Mach-Zehnder modulator, includes: The length difference between the two interference arms of the dual-channel Mach-Zehnder modulator 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 frequency interval between the two channels; The length difference is used to suppress crosstalk between the first channel and the second channel; The dual-channel modulated signal is generated by applying driving signals to the two interferometer arms respectively.

5. The method according to claim 1, characterized in that, The step of separating the dual-channel modulated signal into independent first-wavelength and second-wavelength signals through the dual-channel output module and outputting them to an external optical communication system includes: The dual-channel output module can be configured using an arrayed waveguide grating, a polarization beam splitter, or a tapered coupling structure. 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 with orthogonal polarization states is separated by a birefringent waveguide; If the tapered coupling structure is used, the separated first wavelength signal and the second wavelength signal are coupled to the external optical fiber through a tapered waveguide. The end face tilt angle of the tapered coupling structure is a preset angle to reduce reflection loss.

6. The method according to claim 1, characterized in that, The module that integrates a first light source module, a second light source module, a mode multiplexing module, an optical modulation module, and a dual-channel output module sequentially through the surface of the buffer layer includes: The substrate may be sapphire, silicon carbide or silicon; The buffer layer is constructed using an aluminum gallium nitride (AGaN) graded layer, the composition of which is Al. x Ga 1-x N, where x satisfies 0 <x≤1; The thickness of the buffer layer is set to a preset range to reduce lattice mismatch. The buffer layer is grown on the substrate and the first light source module, the second light source module, the mode multiplexing module, the light modulation module and the dual-channel output module are sequentially integrated on the surface of the buffer layer.

7. The method according to claim 3, characterized in that, The process of modulating the composite optical signal using the optical modulation module to obtain a dual-channel modulated signal includes: The optical modulation module is constructed using a nested ring resonant cavity. The first wavelength and the second wavelength optical signals with different polarization states are generated by a subwavelength grating structure; The polarization states of the first wavelength optical signal and the second wavelength optical signal are converted to the same polarization state by a polarization beam splitter. The first channel and the second channel are separated by thermo-optical tuning of the resonant wavelength of the nested ring resonator; The power difference between the first channel and the second channel is monitored in real time by integrating dual photodetectors and feedback control is performed.

8. A multi-mode 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 7, and the integrated device comprises: An integrated light source is provided, wherein 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, wherein the buffer layer is disposed on a substrate; The optical transmission unit emits an optical signal of a first wavelength through the first light source module and transmits it to the mode multiplexing module; and emits an optical signal of a second wavelength through the second light source module and transmits it to the mode multiplexing module. The optical composite unit combines 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 modulates the composite optical signal through the optical modulation module to obtain a dual-channel modulated signal; The optical output unit separates the dual-channel modulation signal into independent first wavelength signals and second wavelength signals through the dual-channel output module and outputs them to an external optical communication system.

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