A multi-wavelength laser receiving system and method based on OPA beam splitting

Abstract

The application provides a multi-wavelength laser receiving system and method based on OPA beam separation. A first optical phased array performs beam separation and phase modulation on a multi-wavelength spatial laser signal to obtain a plurality of first laser signals of different wavelengths, and emits the plurality of first laser signals to an APD array at different emission angles. A second optical phased array performs beam separation and phase modulation on a multi-wavelength local laser signal to obtain a plurality of second laser signals of different wavelengths, and emits the plurality of second laser signals to the APD array at different emission angles. The APD array receives the plurality of first laser signals and the plurality of second laser signals, and the first laser signals and the second laser signals of the same wavelength irradiate the same APD in the APD array. According to the system and method, the multi-wavelength spatial laser and the multi-wavelength local laser are separated, and the lasers of the same wavelength are directed to the same position, thereby realizing the separation and reception of the multi-wavelength laser signals.

Description

Technical Field

[0001] This application relates to the field of optoelectronic technology, and more specifically, to a multi-wavelength laser receiving system and method based on OPA beam separation. Background Technology

[0002] LiDAR has a wide range of applications, involving multiple disciplines and possessing broad application prospects. Traditional multi-wavelength laser receivers use grating prisms to achieve beam separation, achieving optical interference through light diffraction to separate light sources of different wavelengths.

[0003] However, this method cannot control the landing position of the separated light. The spatial pointing position of each wavelength of light after beam splitting is fixed and difficult to control. Moreover, the separation process requires a mechanical transmission device to rotate the grating to achieve the desired beam splitting effect. Even if the angle of the grating or prism is changed by a mechanical transmission device to control the spatial pointing of the beam, its speed is greatly limited. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a multi-wavelength laser receiving system and method based on OPA beam splitting. The optical phased array (OPA) is used as the optical receiver, and the characteristics of OPA are fully utilized to split multi-wavelength spatial lasers and multi-wavelength local lasers. Lasers of the same wavelength are pointed to the same position, and an APD detection point is set at the position for subsequent detection and processing, so as to realize the beam splitting and reception of multi-wavelength laser signals.

[0005] In a first aspect, embodiments of this application provide a multi-wavelength laser receiving system based on OPA beam splitting, the multi-wavelength laser receiving system including a laser emitting module, a first optical phased array, a second optical phased array, and an APD array;

[0006] The laser emitting module is used to emit multi-wavelength laser signals to the reflecting device and the second optical phased array;

[0007] The first optical phased array is used to receive the multi-wavelength spatial laser signal formed after the multi-wavelength laser signal is reflected by the reflection device and propagated through the spatial channel, perform beam separation and phase modulation on the multi-wavelength spatial laser signal to obtain multiple first laser signals of different wavelengths, and emit the multiple first laser signals at different emission angles to the APD array.

[0008] The second optical phased array is used to receive the multi-wavelength local laser signals directly emitted by the laser emitting module, perform beam separation and phase modulation on the multi-wavelength local laser signals to obtain multiple second laser signals of different wavelengths, and emit the multiple second laser signals to the APD array at different emission angles;

[0009] The APD array is used to receive multiple beams of the first laser signal and multiple beams of the second laser signal; wherein the first laser signal and the second laser signal with the same wavelength illuminate the same APD in the APD array.

[0010] Furthermore, the first optical phased array includes an optical beam splitter, a plurality of phase shifters, and a phased array waveguide connected to each phase shifter;

[0011] The optical beam splitter is used to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals.

[0012] The phase shifter is used to determine a control voltage based on the wavelength of the received spatially separated laser signal, determine a phase difference with an adjacent phase shifter based on the control voltage, and use the phase difference to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference;

[0013] The phased array waveguide is used to transmit the first laser signal to the APD array.

[0014] Furthermore, the phase shifter is also used to calculate the emission angle corresponding to the phase difference in the following manner:

[0015]

[0016] Where θ is the emission angle, and λ is the wavelength of the spatially separated laser signal. Let be the phase difference, and d be the spacing between each phased array waveguide.

[0017] Furthermore, the multi-wavelength laser receiving system also includes a signal processing system;

[0018] The APD array is also used to superimpose the light intensity of the first laser signal and the second laser signal received by each APD to obtain multiple target laser beams, and to convert each target laser beam into a corresponding current signal and transmit it to the signal processing system;

[0019] The signal processing system is used to process multiple received current signals to achieve parallel processing of target lasers of multiple wavelengths.

[0020] Furthermore, for each APD in the APD array, the composite intensity of the target laser obtained by superimposing the intensity of the first laser signal and the second laser signal received by that APD is:

[0021]

[0022] Where T is the period of light, l1 is the first laser signal received by the APD, l2 is the second laser signal received by the APD, and I is the synthesized light intensity.

[0023] Secondly, embodiments of this application also provide a multi-wavelength laser receiving method based on OPA beam separation. This multi-wavelength laser receiving method is applied to a multi-wavelength laser receiving system based on OPA beam separation. The multi-wavelength laser receiving system includes a laser emitting module, a first optical phased array, a second optical phased array, and an APD array. The multi-wavelength laser receiving method includes:

[0024] The laser emitting module is controlled to emit multi-wavelength laser signals toward the reflecting device and the second optical phased array;

[0025] The first optical phased array is controlled to receive the multi-wavelength spatial laser signal formed by the reflection of the multi-wavelength laser signal after the reflection device and the propagation of the spatial channel. The multi-wavelength spatial laser signal is subjected to beam separation and phase modulation to obtain multiple first laser signals of different wavelengths. The multiple first laser signals are then emitted to the APD array at different emission angles.

[0026] The second optical phased array is controlled to receive the multi-wavelength local laser signal directly emitted by the laser emitting module, and the multi-wavelength local laser signal is subjected to beam separation and phase modulation to obtain multiple second laser signals of different wavelengths. The multiple second laser signals are then emitted to the APD array at different emission angles.

[0027] The APD array is controlled to receive multiple beams of the first laser signal and multiple beams of the second laser signal; wherein the first laser signal and the second laser signal with the same wavelength illuminate the same APD in the APD array.

[0028] Furthermore, the first optical phased array includes an optical beam splitter, multiple phase shifters, and a phased array waveguide connected to each phase shifter; the multi-wavelength laser receiving method further includes:

[0029] The optical beam splitter is controlled to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals.

[0030] The phase shifter is controlled to determine a control voltage based on the wavelength of the received spatially separated laser signal, and a phase difference between the phase shifter and the adjacent phase shifter is determined based on the control voltage. The phase difference is then used to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference.

[0031] The phased array waveguide is controlled to transmit the first laser signal to the APD array.

[0032] Furthermore, the multi-wavelength laser receiving method also includes:

[0033] The phase shifter is controlled to calculate the emission angle corresponding to the phase difference in the following manner:

[0034]

[0035] Where θ is the emission angle, and λ is the wavelength of the spatially separated laser signal. Let be the phase difference, and d be the spacing between each phased array waveguide.

[0036] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the multi-wavelength laser receiving method based on OPA beam separation as described above are performed.

[0037] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the multi-wavelength laser receiving method based on OPA beam separation as described above.

[0038] This application provides a multi-wavelength laser receiving system and method based on OPA beam splitting, comprising a laser emitting module, a first optical phased array, a second optical phased array, and an APD array. The laser emitting module emits multi-wavelength laser signals to a reflecting device and the second optical phased array. The first optical phased array receives multi-wavelength spatial laser signals formed by reflection and propagation through a spatial channel after the multi-wavelength laser signals pass through the reflecting device; performs beam splitting and phase modulation on the multi-wavelength spatial laser signals to obtain multiple first laser signals of different wavelengths; and emits these multiple first laser signals to the APD array at different emission angles. The second optical phased array receives multi-wavelength local laser signals directly emitted by the laser emitting module; performs beam splitting and phase modulation on these multi-wavelength local laser signals to obtain multiple second laser signals of different wavelengths; and emits these multiple second laser signals to the APD array at different emission angles. The APD array receives the multiple first laser signals and the multiple second laser signals; wherein the first laser signals and second laser signals of the same wavelength illuminate the same APD in the APD array.

[0039] This application takes into account the disadvantages of uncontrollable spatial distribution and speed limitation caused by mechanical transmission devices in traditional grating beam splitting methods. It uses an optical phased array (OPA) at the optical receiver, making full use of the characteristics of the OPA to split multi-wavelength spatial lasers and multi-wavelength local lasers, and points lasers of the same wavelength to the same position. An APD detection point is set at this position for subsequent detection and processing, thereby realizing the beam splitting and reception of multi-wavelength laser signals.

[0040] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of a multi-wavelength laser receiving system based on OPA beam splitting provided in an embodiment of this application;

[0043] Figure 2 A simplified model diagram of a one-dimensional optical waveguide phased array with n phased array waveguides provided in an embodiment of this application;

[0044] Figure 3 A flowchart illustrating a multi-wavelength laser receiving method based on OPA beam separation provided in this application embodiment;

[0045] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0046] Figure label:

[0047] 10 - Multi-wavelength laser receiving system; 110 - Laser emitting module; 120 - First optical phased array; 130 - Second optical phased array; 140 - APD array; 400 - Electronic equipment; 410 - Processor; 420 - Memory; 430 - Bus. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0049] First, the applicable application scenarios of this application will be introduced. This application can be applied to the field of optoelectronic technology.

[0050] LiDAR has a wide range of applications, involving multiple disciplines and possessing broad application prospects. Traditional multi-wavelength laser receivers use grating prisms to achieve beam separation, achieving optical interference through light diffraction to separate light sources of different wavelengths.

[0051] Research has shown that this method cannot control the landing point of the separated light; the spatial pointing position of each wavelength of light after beam splitting is fixed and difficult to control. Furthermore, the separation process requires a mechanical transmission device to rotate the grating to achieve the desired beam splitting effect. Even if the angle of the grating or prism is changed by a mechanical transmission device to control the spatial pointing of the beam, the speed is still significantly limited.

[0052] Based on this, this application provides a multi-wavelength laser receiving system based on OPA beam splitting, which splits multi-wavelength spatial lasers and multi-wavelength local lasers, and points lasers of the same wavelength to the same position, where an APD detection point is set for subsequent detection and processing, thereby realizing the splitting and reception of multiple wavelength laser signals.

[0053] Please see Figure 1 , Figure 1 This is a schematic diagram of a multi-wavelength laser receiving system based on OPA beam splitting, provided as an embodiment of this application. Figure 1 As shown in the figure, the multi-wavelength laser receiving system 10 provided in this application embodiment includes: a laser emitting module 110, a first optical phased array 120, a second optical phased array 130, and an APD array 140.

[0054] The laser emitting module 110 is used to emit multi-wavelength laser signals to the reflecting device and the second optical phased array.

[0055] Here, the laser emitting module 110 is mainly used to emit multi-wavelength laser signals. In specific implementation, the laser emitting module 110 emits laser signals of different wavelengths to the reflecting device and the second optical phased array 130.

[0056] The first optical phased array 120 is used to receive the multi-wavelength spatial laser signal formed after the multi-wavelength laser signal is reflected by the reflection device and propagated through the spatial channel, to perform beam separation and phase modulation on the multi-wavelength spatial laser signal to obtain multiple first laser signals of different wavelengths, and to transmit the multiple first laser signals to the APD array 140 at different emission angles.

[0057] Here, each first laser signal corresponds to a different wavelength, and the spatial pointing position of each first laser signal is also different.

[0058] An optical phased array (OPA) is a commonly used component in laser emitters. Here, the first optical phased array 120 is mainly used for beam separation of multi-wavelength spatial laser signals. For example... Figure 1 As shown, in a specific implementation, the multi-wavelength laser signal emitted by the laser emitting module 110 is first reflected by a reflecting device. The lens is responsible for focusing the mixed multi-wavelength laser signal and illuminating the first optical phased array 120. The first optical phased array 120 receives the multi-wavelength spatial laser signal formed after reflection by the reflecting device and propagation through the spatial channel, and performs beam separation and phase modulation on the multi-wavelength spatial laser signal to obtain multiple first laser signals of different wavelengths. These multiple first laser signals are then emitted to the APD array 140 at different emission angles. Since the spatial pointing position of each first laser signal is different, the positions where they illuminate the APD array are also different.

[0059] As an optional embodiment, according to the multi-wavelength laser receiving system 10 provided in this application, the first optical phased array 120 includes an optical beam splitter, a plurality of phase shifters, and a phased array waveguide connected to each phase shifter.

[0060] The optical beam splitter is used to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals.

[0061] Here, the optical beam splitter is mainly used to separate multi-wavelength spatial laser signals. In specific implementation, in the first optical phased array 120, the multi-wavelength spatial laser signal is first split into two beams by the optical beam splitter. The phase and intensity of the two separated optical signals are completely consistent. Then, it is decomposed into multiple spatially separated laser signals multiple times.

[0062] The phase shifter is used to determine a control voltage based on the wavelength of the received spatially separated laser signal, determine a phase difference with an adjacent phase shifter based on the control voltage, and use the phase difference to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference.

[0063] Here, each phase shifter is used to perform phase modulation on the received spatially separated laser signal so that the phase-modulated spatially separated laser signal has a different emission angle.

[0064] In specific implementation, for each phase shifter, the phase shifter determines the control voltage based on the wavelength of the received spatially separated laser signal, determines the phase difference with the adjacent phase shifter based on the control voltage, and uses the phase difference to perform phase modulation on the spatially separated laser signal to obtain a first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference.

[0065] The phased array waveguide is used to transmit the first laser signal to the APD array 140.

[0066] Here, each phased array waveguide is used to transmit the laser signal transmitted by the phase shifter connected to it. In this way, laser signal light with different phases is transmitted to the APD array 140 via the phased array waveguide array.

[0067] Furthermore, a detailed explanation is provided regarding how a single optical phased array can split mixed multi-wavelength laser beams. Please refer to [link to relevant documentation]. Figure 2 , Figure 2 This is a simplified schematic diagram of a one-dimensional optical waveguide phased array with n phased array waveguides provided in an embodiment of this application, as shown below. Figure 2 As shown, let the amplitude of the photoelectric field emitted by the i-th waveguide (i = 1, 2, ..., n) be A. i Its phase is The direction function is f i (θ), this simplified model ignores the physical size of each phased array waveguide, i.e., it assumes that it is infinitely small.

[0068] At a distance of r i At a distance from the APD, the intensity E of the diffracted photoelectric field with wavelength λ emitted by the i-th phased array waveguide is... i The following formula (1) can be used to express this:

[0069]

[0070] In linear propagation media, the electromagnetic field equations are linear, and the superposition law can be applied. Therefore, the total photoelectric field at the distant observation point P can be considered as the superposition of the diffracted photoelectric fields generated by n phased array waveguides in a one-dimensional phased array at the APD, hence:

[0071]

[0072] If all phased array waveguides have the same shape, the waveguide direction Figure 1 Therefore, the direction function can be extracted, and the above formula (2) can be expressed as:

[0073]

[0074] In the denominator on the right side of the equation (3) above, r i We can use r0 instead, because r0 and r i The difference is very small compared to r0, so r0 is used instead of r. i This has almost no effect on the amplitude of the field strength E. However, when considering the phase between waveguides, r i r0 cannot be used as a substitute. The phased array waveguides are equally spaced; let the spacing be d, then r i The following formula (4) can be used to express this:

[0075] r i =r0-id sinθ (4)

[0076] Therefore, the above formula (3) can be expressed as:

[0077]

[0078] It can be seen that the combined field strength E is a function of θ, so it is denoted by E(θ). Here, we are not concerned with the absolute magnitude of E, but mainly with its relative distribution. The constant terms considering amplitude and phase can be ignored. The direction distribution function E(θ) of the optical waveguide phased array can be expressed by the following formula (6):

[0079]

[0080] In the above formula (6), f(θ) is the radiation pattern of the phased array waveguide, and the rest are array factors.

[0081] In the above formula (6), the amplitude of the electric field of the first phased array waveguide emitted light is expressed as A i Indicates that the phase is This means that its distribution can be regarded as the phase-weighted distribution required to obtain beam scanning, that is, the phase shift value of the phase shifter in the phased array. According to the above formula (6), under the condition that the waveguide pattern is isotropic, that is, f(θ) = 1, the electric field distribution E(θ) of the one-dimensional phased array can be expressed by the following formula (7):

[0082]

[0083] in,

[0084]

[0085] In the above formula, θ is the diffraction angle; θ s The scanning angle of the phased array beam is the position of the maximum intensity of the diffraction fringes. The phase difference caused by the spatial distance d between adjacent units can be called the "spatial phase difference" between adjacent units. To obtain the beam scanning angle θ s The required phase shift difference between each unit is provided by the phase shifter of each unit, and is simply referred to as the "intra-array phase difference" between adjacent units.

[0086] Irradiation conditions for uniformly distributed apertures (A) i =1), and from the following formula (8), E(θ) is:

[0087]

[0088] in,

[0089]

[0090] Substituting into Euler's formula, we get

[0091]

[0092] The distribution function of relative light intensity is expressed by the following formula (10):

[0093]

[0094] From the above formula (10), we can obtain that the relative intensity distribution (spatial distribution) of the emitted light from the OPA is at θ = θ s The maximum value is obtained at θ, that is, the direction of the maximum value of the phased array output beam is θ. s The angle is expressed by the following formula (11):

[0095]

[0096] Therefore, changing the phase difference between adjacent elements within the array It can change θ s This allows you to change the direction of the maximum beam value of the phased array.

[0097] The scanning angle θ of the phased array beam s It is also controlled by the phase shifters inside the phased array. Control, therefore, can be achieved through adjustment The interference effect between the outgoing optical waveguides is changed in real time, thereby affecting the scanning angle θ of the phased array beam. s This allows emitted light of different wavelengths λ to have different illumination intensity distributions. Therefore, specifically, the phase shifter is also used to calculate the emission angle corresponding to the phase difference in the following way:

[0098]

[0099] Where θ is the emission angle, and λ is the wavelength of the spatially separated laser signal. Let be the phase difference, and d be the spacing between each phased array waveguide.

[0100] That is, light spots of different wavelengths appear at different positions, and the beams of different wavelengths can be separated and pointed to specific positions by controlling the scanning angle of the phased array beam.

[0101] There is a phase difference between the waveguide beams. Depending on the phase difference, the equiphase surfaces also differ. Beams with the same phase relationship will superimpose, while beams with different phase relationships will cancel each other out. The propagation direction of the beam will remain perpendicular to the equiphase surface, thus changing the beam's propagation direction. Therefore, by introducing different phase differences into the waveguides of each output beam, a beam deflection effect can be achieved. Furthermore, because the equiphase surfaces of output beams of different wavelengths are not consistent, their deflection effects are also different, resulting in the separation of light spots at different positions. That is, the spatial pointing position of each wavelength beam is controlled by the phase difference. Thus, according to the embodiments provided in this application, a suitable control voltage is set according to the wavelength of the spatially separated laser signal to obtain a suitable phase shift value, so that beams of different wavelengths have different illumination angles, ensuring that the output light has different illumination intensity distributions.

[0102] The second optical phased array 130 is used to receive the multi-wavelength local laser signal directly emitted by the laser emitting module 110, perform beam separation and phase modulation on the multi-wavelength local laser signal to obtain multiple second laser signals of different wavelengths, and emit the multiple second laser signals to the APD array 140 at different emission angles.

[0103] Here, the second optical phased array 130 is mainly used for beam separation of multi-wavelength local laser signals. In specific implementation, the second optical phased array 130 receives multi-wavelength local laser signals directly emitted by the laser emitting module 110, performs beam separation and phase modulation on the multi-wavelength local laser signals to obtain multiple second laser signals of different wavelengths, and emits the multiple second laser signals to the APD array 140 at different emission angles.

[0104] Here, the input of the second optical phased array 130 is a multi-wavelength local laser signal. The internal structure and working process of the second optical phased array 130 are the same as those of the first optical phased array 120, and can achieve the same technical effect, which will not be described in detail here.

[0105] According to the embodiments provided in this application, the first optical phased array 120 and the second optical phased array 130 split beams to multi-wavelength spatial laser signals and multi-wavelength local laser signals, respectively. From the perspective of wavelength, both contain beam components of the same wavelength. From the perspective of laser intensity, the multi-wavelength spatial laser signal has a reduced laser intensity after being affected by the interference and attenuation of the spatial channel, and its intensity is significantly inconsistent with that of the local laser. This affects the absolute magnitude of the light intensity after laser beam splitting.

[0106] The APD array 140 is used to receive multiple beams of the first laser signal and multiple beams of the second laser signal.

[0107] Here, the APD array 140 is mainly used to receive the lasers emitted by the first optical phased array 120 and the second optical phased array 130. In specific implementations, the APD array 140 receives multiple first laser signals and multiple second laser signals. First laser signals and second laser signals of the same wavelength illuminate the same APD in the APD array. That is, the first optical phased array 120 and the second optical phased array 130 direct different source beams of the same wavelength to the same position, focusing them on one APD in the APD array 140, with different APDs corresponding to beams of different wavelengths.

[0108] As an optional embodiment, the multi-wavelength laser receiving system 10 provided in this application embodiment also includes a signal processing system.

[0109] The APD array 140 is also used to superimpose the light intensity of the first laser signal and the second laser signal received by each APD to obtain multiple target laser beams, and to convert each target laser beam into a corresponding current signal and transmit it to the signal processing system.

[0110] In this specific implementation, after the APD array 140 receives the first laser signal and the second laser signal, since the first laser signal and the second laser signal with the same wavelength illuminate the same APD in the APD array 140, the light intensity of the first laser signal and the second laser signal received by each APD is superimposed to obtain multiple target laser beams. Each target laser beam is then converted into a corresponding current signal and transmitted to the signal processing system.

[0111] Specifically, according to the embodiments provided in this application, for each APD in the APD array, the composite light intensity of the target laser obtained by superimposing the first laser signal and the second laser signal received by the APD is:

[0112]

[0113] Where T is the period of light, l1 is the first laser signal received by the APD, l2 is the second laser signal received by the APD, and I is the synthesized light intensity.

[0114] here,

[0115]

[0116]

[0117]

[0118] Where A1 is the amplitude of the optical wave vibration of the first laser signal l1, and A2 is the amplitude of the optical wave vibration of the second laser signal l2. The initial phase before phase modulation of the first laser signal l1. The initial phase before phase modulation of the second laser signal l2. λ i λ is the wavelength, and c is the speed of light.

[0119] The signal processing system is used to process multiple received current signals to achieve parallel processing of target lasers of multiple wavelengths.

[0120] Here, the signal processing system is mainly used to process the received current signals. In specific implementation, the signal processing system processes multiple current signals corresponding to multiple target lasers to achieve parallel processing of target lasers of multiple wavelengths.

[0121] The multi-wavelength laser receiving system provided in this application includes a laser emitting module, a first optical phased array, a second optical phased array, and an APD array. The laser emitting module is used to emit multi-wavelength laser signals to a reflecting device and the second optical phased array. The first optical phased array is used to receive multi-wavelength spatial laser signals formed by reflection and propagation through a spatial channel after the multi-wavelength laser signals have passed through the reflecting device, performs beam separation and phase modulation on the multi-wavelength spatial laser signals to obtain multiple first laser signals of different wavelengths, and emits these multiple first laser signals to the APD array at different emission angles. The second optical phased array is used to receive multi-wavelength local laser signals directly emitted by the laser emitting module, performs beam separation and phase modulation on the multi-wavelength local laser signals to obtain multiple second laser signals of different wavelengths, and emits these multiple second laser signals to the APD array at different emission angles. The APD array is used to receive multiple first laser signals and multiple second laser signals; wherein, first laser signals and second laser signals of the same wavelength illuminate the same APD in the APD array.

[0122] This application takes into account the disadvantages of uncontrollable spatial distribution and speed limitation caused by mechanical transmission devices in traditional grating beam splitting methods. It uses an optical phased array (OPA) at the optical receiver, making full use of the characteristics of the OPA to split multi-wavelength spatial lasers and multi-wavelength local lasers, and points lasers of the same wavelength to the same position. An APD detection point is set at this position for subsequent detection and processing, thereby realizing the beam splitting and reception of multi-wavelength laser signals.

[0123] Please see Figure 3 , Figure 3 This is a flowchart illustrating a multi-wavelength laser receiving method based on OPA beam separation, provided as an embodiment of this application. The multi-wavelength laser receiving method is applied to a multi-wavelength laser receiving system based on OPA beam separation provided in the above embodiment. The multi-wavelength laser receiving system includes a laser emitting module, a first optical phased array, a second optical phased array, and an APD array. Figure 3 As shown, the multi-wavelength laser receiving method includes:

[0124] S301, control the laser emitting module to emit multi-wavelength laser signals to the reflecting device and the second optical phased array;

[0125] S302, control the first optical phased array to receive the multi-wavelength spatial laser signal formed by the reflection of the multi-wavelength laser signal after the reflection device and the propagation of the spatial channel, perform beam separation and phase modulation on the multi-wavelength spatial laser signal to obtain multiple first laser signals of different wavelengths, and emit the multiple first laser signals at different emission angles to the APD array.

[0126] S303, control the second optical phased array to receive the multi-wavelength local laser signal directly emitted by the laser emitting module, perform beam separation and phase modulation on the multi-wavelength local laser signal to obtain multiple second laser signals of different wavelengths, and emit the multiple second laser signals to the APD array at different emission angles;

[0127] S304, control the APD array to receive multiple beams of the first laser signal and multiple beams of the second laser signal; wherein, the first laser signal and the second laser signal with the same wavelength illuminate the same APD in the APD array.

[0128] Furthermore, the first optical phased array includes an optical beam splitter, multiple phase shifters, and a phased array waveguide connected to each phase shifter; the multi-wavelength laser receiving method further includes:

[0129] The optical beam splitter is controlled to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals.

[0130] The phase shifter is controlled to determine a control voltage based on the wavelength of the received spatially separated laser signal, and a phase difference between the phase shifter and the adjacent phase shifter is determined based on the control voltage. The phase difference is then used to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference.

[0131] The phased array waveguide is controlled to transmit the first laser signal to the APD array.

[0132] Furthermore, the multi-wavelength laser receiving method also includes:

[0133] The phase shifter is controlled to calculate the emission angle corresponding to the phase difference in the following manner:

[0134]

[0135] Where θ is the emission angle, and λ is the wavelength of the spatially separated laser signal. Let be the phase difference, and d be the spacing between each phased array waveguide.

[0136] Furthermore, the multi-wavelength laser receiving system also includes a signal processing system; the multi-wavelength laser receiving method further includes:

[0137] The APD array is controlled to superimpose the light intensity of the first laser signal and the second laser signal received by each APD to obtain multiple target laser beams, and each target laser beam is converted into a corresponding current signal and transmitted to the signal processing system;

[0138] The signal processing system is controlled to process multiple received current signals in order to achieve parallel processing of target lasers of multiple wavelengths.

[0139] Furthermore, for each APD in the APD array, the composite intensity of the target laser obtained by superimposing the intensity of the first laser signal and the second laser signal received by that APD is:

[0140]

[0141] Where T is the period of light, l1 is the first laser signal received by the APD, l2 is the second laser signal received by the APD, and I is the synthesized light intensity.

[0142] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0143] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, they can perform the operations described above. Figure 3 The steps of the multi-wavelength laser receiving method based on OPA beam separation in the method embodiment shown are specifically implemented in the method embodiment and will not be repeated here.

[0144] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 3 The steps of the multi-wavelength laser receiving method based on OPA beam separation in the method embodiment shown are specifically implemented in the method embodiment and will not be repeated here.

[0145] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0146] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0147] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0148] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0149] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0150] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0151] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-wavelength laser receiving system based on OPA beam splitting, characterized in that, The multi-wavelength laser receiving system includes a laser emitting module, a first optical phased array, a second optical phased array, and an APD array; The laser emitting module is used to emit multi-wavelength laser signals to the reflecting device and the second optical phased array; The first optical phased array is used to receive the multi-wavelength spatial laser signal formed after the multi-wavelength laser signal is reflected by the reflection device and propagated through the spatial channel, perform beam separation and phase modulation on the multi-wavelength spatial laser signal to obtain multiple first laser signals of different wavelengths, and emit the multiple first laser signals at different emission angles to the APD array. The second optical phased array is used to receive the multi-wavelength local laser signals directly emitted by the laser emitting module, perform beam separation and phase modulation on the multi-wavelength local laser signals to obtain multiple second laser signals of different wavelengths, and emit the multiple second laser signals to the APD array at different emission angles; The APD array is used to receive multiple beams of the first laser signal and multiple beams of the second laser signal, and to superimpose the light intensity of the first laser signal and the second laser signal received by each APD to obtain multiple target laser beams; wherein, the first laser signal and the second laser signal with the same wavelength are irradiated by the same APD in the APD array; The first optical phased array includes an optical beam splitter, multiple phase shifters, and a phased array waveguide connected to each phase shifter; The optical beam splitter is used to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals. The multi-wavelength spatial laser signal is first split into two beams by the optical beam splitter. The phase and intensity of the two separated optical signals are completely consistent. The signal is then decomposed into multiple spatially separated laser signals multiple times. The phase shifter is used to determine a control voltage based on the wavelength of the received spatially separated laser signal, determine a phase difference with an adjacent phase shifter based on the control voltage, and use the phase difference to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference; The phased array waveguide is used to transmit the first laser signal to the APD array.

2. The multi-wavelength laser receiving system according to claim 1, characterized in that, The phase shifter is also used to calculate the emission angle corresponding to the phase difference in the following manner: in, The launch angle is... The wavelength of the spatially separated laser signal. The phase difference, The spacing between each phased array waveguide.

3. The multi-wavelength laser receiving system according to claim 1, characterized in that, The multi-wavelength laser receiving system also includes a signal processing system; The APD array is also used to convert each target laser beam into a corresponding current signal and transmit it to the signal processing system; The signal processing system is used to process multiple received current signals to achieve parallel processing of target lasers of multiple wavelengths.

4. The multi-wavelength laser receiving system according to claim 3, characterized in that, For each APD in the APD array, the combined intensity of the target laser obtained by superimposing the first laser signal and the second laser signal received by that APD is: in, For the period of light, This is the first laser signal received by the APD. This is the second laser signal received by the APD. The intensity of the synthesized light is denoted as .

5. A multi-wavelength laser receiving method based on OPA beam separation, characterized in that, The multi-wavelength laser receiving method is applied to a multi-wavelength laser receiving system based on OPA beam splitting as described in any one of claims 1-4. The multi-wavelength laser receiving system includes a laser emitting module, a first optical phased array, a second optical phased array, and an APD array. The multi-wavelength laser receiving method includes: The laser emitting module is controlled to emit multi-wavelength laser signals toward the reflecting device and the second optical phased array; The first optical phased array is controlled to receive the multi-wavelength spatial laser signal formed by the reflection of the multi-wavelength laser signal after the reflection device and the propagation of the spatial channel. The multi-wavelength spatial laser signal is subjected to beam separation and phase modulation to obtain multiple first laser signals of different wavelengths. The multiple first laser signals are then emitted to the APD array at different emission angles. The second optical phased array is controlled to receive the multi-wavelength local laser signal directly emitted by the laser emitting module, and the multi-wavelength local laser signal is subjected to beam separation and phase modulation to obtain multiple second laser signals of different wavelengths. The multiple second laser signals are then emitted to the APD array at different emission angles. The APD array is controlled to receive multiple beams of the first laser signal and multiple beams of the second laser signal, and the light intensity of the first laser signal and the second laser signal received by each APD is superimposed to obtain multiple target laser beams; wherein, the first laser signal and the second laser signal with the same wavelength are irradiated by the same APD in the APD array; The first optical phased array includes an optical beam splitter, multiple phase shifters, and a phased array waveguide connected to each phase shifter. The multi-wavelength laser receiving method further includes: The optical beam splitter is controlled to separate the multi-wavelength spatial laser signal into multiple spatially separated laser signals. The multi-wavelength spatial laser signal is first split into two beams by the optical beam splitter. The phase and intensity of the two separated optical signals are completely consistent. The signal is then decomposed into multiple spatially separated laser signals multiple times. The phase shifter is controlled to determine a control voltage based on the wavelength of the received spatially separated laser signal, and a phase difference between the phase shifter and the adjacent phase shifter is determined based on the control voltage. The phase difference is then used to perform phase modulation on the spatially separated laser signal to obtain the first laser signal, so that the first laser signal irradiates at the emission angle corresponding to the phase difference. The phased array waveguide is controlled to transmit the first laser signal to the APD array.

6. The multi-wavelength laser receiving method according to claim 5, characterized in that, The multi-wavelength laser receiving method further includes: The phase shifter is controlled to calculate the emission angle corresponding to the phase difference in the following manner: in, The launch angle is... The wavelength of the spatially separated laser signal. The phase difference, The spacing between each phased array waveguide.

7. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the multi-wavelength laser receiving method based on OPA beam separation as described in any one of claims 5 to 6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the multi-wavelength laser receiving method based on OPA beam separation as described in any one of claims 5 to 6.

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