Photonic integrated chip, laser radar using photonic integrated chip, and detection method

Abstract

The invention provides a photonic integrated chip, a laser radar using the photonic integrated chip and a detection method. The photonic integrated chip comprises a substrate, a first array waveguide grating, a second array waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers and a photoelectric detector. The first array waveguide grating is used for splitting the emitted laser signal to obtain a plurality of groups of split emitted signals; the multimode interference coupler is used for receiving the beam-split emission signal, emitting the beam-split emission signal to a to-be-detected target object, receiving the reflected light spot and transmitting the reflected light spot to the optical coupler; the second array waveguide grating is used for splitting the local laser signal to obtain a plurality of groups of split local signals; the optical coupler is used for processing the reflected light spot and the split local signal to obtain a coupled signal; the photoelectric detector is used for receiving the coupling signal and processing the coupling signal. And the photonic integrated chip for the laser radar, which has a relatively high chip integration level, is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of photon integrated chips, and in particular to a photon integrated chip, a laser radar using the photon integrated chip, and a detection method. Background Art

[0002] Photonic integrated chips use light waves or electromagnetic waves as carriers for information transmission or data calculation. They generally rely on dielectric optical waveguides in integrated optics or silicon-based optoelectronics to transmit guided-mode optical signals, integrating the modulation, transmission, and demodulation of optical and electrical signals on the same substrate or chip.

[0003] It is known from the related technology that currently, for photonic integrated chips for LiDAR, circulators are needed to complete signal transmission and reception. However, the circulator is large in size and cannot be integrated into the chip, thus limiting the further improvement of chip integration. In addition, the structure of the circulator will also introduce additional losses, which will also reduce the working efficiency of the chip.

[0004] Therefore, developing a photonic integrated chip for lidar with high chip integration and chip working efficiency has become a current research hotspot. Summary of the invention

[0005] The present invention provides a photon integrated chip, a laser radar using the photon integrated chip, and a detection method, thereby obtaining a photon integrated chip for laser radar with high chip integration and chip working efficiency, laying a foundation for realizing the integrated transmission and reception of the laser radar.

[0006] The present invention provides a photon integrated chip, which comprises: a substrate, a first arrayed waveguide grating, a second arrayed waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers, and a photodetector, wherein the first arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on a received emission laser signal to obtain a multi-component beam-posted emission signal, wherein the number of beam splitting processing performed on the emission laser signal corresponds to the number of the multimode interference couplers; the multimode interference coupler is arranged on the substrate, and is used to receive the beam-posted emission signal, and transmit the beam-posted emission signal to a target object to be detected, and receive a reflected light spot and The reflected light spot is transmitted to the optical coupler, wherein the reflected light spot is formed after the post-splitting emission signal is emitted to the target object to be detected; the second arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received local laser signal to obtain multiple components of post-splitting local signals, wherein the number of beam splitting processing on the local laser signal corresponds to the number of the multi-mode interference couplers; the optical coupler is arranged on the substrate, and is used to perform coupling processing on the reflected light spot and the post-splitting local signal to obtain a coupled signal; the photodetector is arranged on the substrate, and is used to receive the coupled signal and process the coupled signal.

[0007] According to a photonic integrated chip provided by the present invention, a plurality of multimode interference couplers are arranged on the substrate at preset intervals, wherein the interval size of the preset intervals is determined according to the size of the reflection light spot so that the reflection light spot can be received individually by the multimode interference coupler corresponding to the reflection light spot.

[0008] According to a photonic integrated chip provided by the present invention, the length of the multimode interference coupler is set to a first target length, wherein the first target length is determined based on the width of the multimode interference coupler, the width of the incident end formed by the incident end of the multimode interference coupler formed by the incident signal after beam splitting, and the self-image effect of the multimode interference coupler, so that the incident signal after beam splitting is incident on one side of the multimode interference coupler having the first target length and then emitted from a position along the other side of the multimode interference coupler corresponding to the incident position of the incident signal after beam splitting.

[0009] According to a photonic integrated chip provided by the present invention, the length of the multimode interference coupler is set to an integer multiple of a second target length, wherein the second target length is determined according to the spot size of the reflected light spot and the width of the multimode interference coupler.

[0010] According to a photonic integrated chip provided by the present invention, the multimode interference coupler is composed of a silicon nitride waveguide.

[0011] The present invention also provides a laser radar using a photon integrated chip, wherein the laser radar includes a photon integrated chip and a beam expanding thin lens, wherein the beam expanding thin lens is arranged between the photon integrated chip and the target object to be detected, wherein the beam splitting transmission signal emitted by the multimode interference coupler is emitted to the target object to be detected after passing through the beam expanding thin lens and is reflected by the target object to be detected to form a reflection light spot, so that the reflection light spot is transmitted to the optical coupler through the multimode interference coupler, and the reflection light spot and the beam splitting local signal are coupled based on the optical coupler to obtain a coupled signal, and the coupled signal is processed based on the photodetector to obtain the detection result of the target object to be detected.

[0012] According to a laser radar using a photonic integrated chip provided by the present invention, the laser radar also includes a transmitting laser light source and a local laser light source, wherein the transmitting laser light source is used to form a transmitting laser signal, so that the transmitting laser signal is subjected to beam splitting processing to obtain a post-splitting transmitting signal; the local laser light source is used to form a local laser signal, so that the local laser signal is subjected to beam splitting processing to obtain a post-splitting local signal.

[0013] According to a laser radar using a photonic integrated chip provided by the present invention, a plurality of the multi-mode interference couplers are symmetrically distributed on the substrate of the photonic integrated chip along the lens optical axis of the beam expanding thin lens.

[0014] The present invention also provides a detection method, which is applied to a laser radar using a photon integrated chip, and the detection method includes: determining a target object to be detected; calling the laser radar using the photon integrated chip to transmit a split-transmit signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split-transmit signal through reflection from the target object to be detected; obtaining a coupled signal based on the reflected light spot and the split-local signal, and determining the detection position of the target object to be detected based on the coupled signal.

[0015] According to a detection method provided by the present invention, the reflected light spot includes multiple groups of reflected light spots transmitted to each optical coupler through each of the multimode interference couplers; the local signal after beam splitting includes multiple groups of local signals after beam splitting, wherein the number of groups of local signals after beam splitting is the same as the number of groups of reflected light spots; based on the reflected light spots and the local signals after beam splitting, a coupling signal is obtained, and based on the coupling signal, the detection position of the target object to be detected is determined, specifically including: coupling processing is performed on multiple groups of reflected light spots and multiple groups of local signals after beam splitting to obtain multiple groups of coupling signals; based on the multiple groups of coupling signals, the detection position of the target object to be detected is determined.

[0016] The present invention also provides a detection device, which is applied to a laser radar using a photon integrated chip, and the detection device includes: a determination module, which is used to determine a target object to be detected; a calling module, which is used to call the laser radar using the photon integrated chip to transmit a split-transmit signal to the target object to be detected, and obtain a reflected light spot corresponding to the split-transmit signal through reflection by the target object to be detected; a detection module, which is used to obtain a coupled signal based on the reflected light spot and the local signal after splitting, and determine the detection position of the target object to be detected based on the coupled signal.

[0017] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned detection methods when executing the computer program.

[0018] The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the detection method described above is implemented.

[0019] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above detection methods.

[0020] The present invention provides a photon integrated chip, a laser radar using the photon integrated chip, and a detection method. The photon integrated chip includes: a substrate, a first array waveguide grating, a second array waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers, and a photoelectric detector, wherein the first array waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received emission laser signal to obtain multiple components of beam-transmitted emission signals; the multimode interference coupler is arranged on the substrate, and is used to receive the beam-splitting emission signal, and transmit the beam-splitting emission signal to a target object to be detected, and receive a reflected light spot and transmit the reflected light spot to the optical coupler; the second array waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received local laser signal to obtain multiple components of beam-transmitted local signals; the optical coupler is arranged on the substrate, and is used to perform coupling processing on the reflected light spot and the beam-splitting local signal to obtain a coupled signal; the photoelectric detector is arranged on the substrate, and is used to receive the coupled signal and process the coupled signal. The multi-mode interference coupler can be used to realize the integrated transmission and reception of the photonic integrated chip, and a photonic integrated chip for lidar with high chip integration and chip working efficiency is obtained, laying the foundation for realizing the integrated transmission and reception of lidar. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the photon integrated chip provided by the present invention.

[0023] Figure 2 It is a schematic structural diagram of the multimode interference coupler provided by the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of a laser radar using a photon integrated chip provided by the present invention.

[0025] Figure 4 It is a flow chart of the detection method provided by the present invention.

[0026] Figure 5 It is a structural schematic diagram of the detection device provided by the present invention.

[0027] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention.

[0028] Reference numerals: 100: photonic integrated chip; 110: substrate; 120: first arrayed waveguide grating; 130: a second arrayed waveguide grating; 140: a multimode interference coupler; 150: Optical coupler; 160: Photodetector; 1401: Input terminal; 1402: receiving end; 1403: transmitting end; 10: laser radar using photon integrated chip; 200: Beam expanding thin lens. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The photonic integrated chip provided by the present invention can realize the integration of transmission and reception with the help of a multi-mode interference coupler, thereby improving the integration of the chip. In addition, the photonic integrated chip does not have a circulator and can also reduce the chip power consumption, thereby obtaining a photonic integrated chip for laser radar with high chip integration and chip working efficiency, laying the foundation for realizing the integration of transmission and reception of laser radar.

[0031] Figure 1 It is a schematic diagram of the structure of the photon integrated chip provided by the present invention.

[0032] The following will be combined Figure 1 The structure of the photonic integrated chip provided by the present invention is described.

[0033] In an exemplary embodiment of the present invention, Figure 1 It can be seen that the photonic integrated chip 100 may include a substrate 110, a first arrayed waveguide grating 120, a second arrayed waveguide grating 130, a plurality of multimode interference couplers 140, a plurality of optical couplers 150, and a photodetector 160, and each module will be introduced below.

[0034] In one embodiment, the first arrayed waveguide grating 120 may be disposed on the substrate 110. The first arrayed waveguide grating 120 may be used to perform beam splitting processing on the received emission laser signal to obtain a multi-group beam-forming emission signal, wherein the number of beam splitting processing on the emission laser signal corresponds to the number of the multimode interference couplers 140.

[0035] Combination Figure 1 It can be seen that Figure 1 Four multimode interference couplers 140 are shown, and the corresponding first arrayed waveguide grating 120 can perform beam splitting processing on the received emission laser signal to obtain four groups of beam-bundled emission signals (such as Figure 1 0 (the solid line output by the first arrayed waveguide grating 120).

[0036] In another embodiment, the multimode interference coupler 140 may be disposed on the substrate 110. The film interference coupler 140 may be used to receive the split transmission signal and transmit the split transmission signal to the target object to be detected, and receive the reflected light spot and transmit the reflected light spot to the optical coupler 140, wherein the reflected light spot is formed after the split transmission signal is transmitted to the target object to be detected.

[0037] Figure 2 It is a schematic structural diagram of the multimode interference coupler provided by the present invention.

[0038] The following will be combined Figure 2 The structure and application scenarios of the multimode interference coupler are explained.

[0039] In one embodiment, in combination Figure 2 It can be seen that the multimode interference coupler 140 can be divided into an input end 1401, a receiving end 1402, and a transmitting end 1403, wherein: Figure 2 The solid lines with arrows in the middle are used to represent the emission signal and the reflected light spot after beam splitting. Figure 2 It can be seen that the transmitted signal after beam splitting is transmitted to the target object to be detected through the input end 1401 of the multimode interference coupler 140; the reflected light spot is transmitted back to the multimode interference coupler 140 through the transmitting end 1403 and the receiving end 1402 of the multimode interference coupler 140 in sequence, and is transmitted to the optical coupler 150 for wave combining processing. Among them, the reflected light spot is coupled with the end face of the entire multimode interference coupler 140 (for the rolling transmitting end 1403) and output by the receiving end 1402.

[0040] In another embodiment, the second arrayed waveguide grating 130 may be disposed on the substrate 110. The second arrayed waveguide grating 130 may be used to perform beam splitting processing on the received local laser signal to obtain multiple groups of beam-split local signals. The number of beam splitting processing on the local laser signal corresponds to the number of multimode interference couplers.

[0041] Continue to combine Figure 1 It can be seen that the second arrayed waveguide grating 130 performs beam splitting processing on the received local laser signal to obtain four groups of beam-split local signals, and transmits the four groups of beam-split local signals to four optical couplers 150 for wave combining processing. It should be noted that the number of beam splitting processes for the local laser signal (e.g., 4 beams) is equal to the number of multimode interference couplers (e.g., 4 groups).

[0042] In another embodiment, the optical coupler 150 may be disposed on the substrate 110. The optical coupler 150 may be used to couple the reflected light spot and the local signal after beam splitting to obtain a coupled signal. The photodetector 160 may be disposed on the substrate 110. The photodetector 160 may be used to receive the coupled signal and process the coupled signal, thereby realizing position detection of the target object to be detected.

[0043] The photon integrated chip provided by the present invention comprises: a substrate, a first arrayed waveguide grating, a second arrayed waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers, and a photodetector, wherein the first arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received emission laser signal to obtain a multi-component beam-transmitted signal; the multimode interference coupler is arranged on the substrate, and is used to receive the beam-splitting transmitted signal, and transmit the beam-splitting transmitted signal to the target object to be detected, and receive the reflected light spot and transmit the reflected light spot to the optical coupler; the second arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received local laser signal to obtain a multi-component beam-transmitted local signal; the optical coupler is arranged on the substrate, and is used to couple the reflected light spot and the beam-splitting local signal to obtain a coupled signal; the photodetector is arranged on the substrate, and is used to receive the coupled signal and process the coupled signal. The multimode interference coupler can realize the integrated transmission and reception of the photon integrated chip, and obtain a photon integrated chip for laser radar with high chip integration and chip working efficiency, which lays the foundation for realizing the integrated transmission and reception of laser radar.

[0044] In another exemplary embodiment of the present invention, Figure 1 It can be seen that multiple multimode interference couplers 140 can be arranged on the substrate 110 at preset intervals, wherein the interval size of the preset interval can be determined according to the size of the reflection spot so that the reflection spot can be received individually by the multimode interference coupler 140 corresponding to the reflection spot.

[0045] During application, the preset intervals between multiple multimode interference couplers 140 can be determined according to the size of the reflected light spot, so that the reflected light spot can only be received by the current multimode interference coupler 140, eliminating the crosstalk factor between different channels.

[0046] In another exemplary embodiment of the present invention, Figure 1 It can be known that the length of the multimode interference coupler 140 can be set to a first target length, wherein the first target length can be determined based on the width of the multimode interference coupler 140, the incident end width of the incident end formed by the transmission signal after beam splitting incident on the multimode interference coupler 140, and the self-imaging effect of the multimode interference coupler 140, so that the transmission signal after beam splitting is incident on one side of the multimode interference coupler 140 having the first target length and then emitted from a position along the other side of the multimode interference coupler 140 corresponding to the incident position of the transmission signal after beam splitting.

[0047] In one example, combining Figure 2 To illustrate, the first target length may be based on the width of the multimode interference coupler 140 (which may correspond to Figure 2The width of the transmitting end 1403 in the middle), the width of the incident end formed by the incident signal of the multimode interference coupler 140 after the beam splitting (which can correspond to Figure 2 The width of the input end 1401 in the multimode interference coupler 140 is determined by the self-image effect of the multimode interference coupler 140. Based on the multimode interference coupler 140 of the first target length, the injected transmitting end signal (corresponding to Figure 2 The split transmission signal incident along the input end 1401) will be completely transmitted from the corresponding position on the other side of the waveguide (corresponding to Figure 2 The signal is transmitted from the transmitting end 1403 at a position corresponding to the position where the transmitted signal after beam splitting is incident.

[0048] In another exemplary embodiment of the present invention, the length of the multimode interference coupler 140 may be set to an integer multiple of the second target length, wherein the second target length may be determined according to the spot size of the reflected light spot and the width of the multimode interference coupler 140. In the application process, setting the length of the multimode interference coupler 140 to an integer multiple of the second target length can ensure that the receiving end 1402 of the multimode interference coupler 140 can receive the reflected light spot with maximum power, while minimizing the reflected light spot received by the input end 1401 of the multimode interference coupler 140.

[0049] In another exemplary embodiment of the present invention, the multimode interference coupler 140 may be formed of a silicon nitride waveguide. The multimode interference coupler formed of a silicon nitride waveguide may have low loss, high mode matching with the laser radar, and reduce loss and increase transmission power.

[0050] According to the foregoing description, the photonic integrated chip provided by the present invention includes: a substrate, a first arrayed waveguide grating, a second arrayed waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers, and a photodetector, wherein the first arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received emission laser signal to obtain multiple components of beam-split emission signals; the multimode interference coupler is arranged on the substrate, and is used to receive the beam-split emission signal, and transmit the beam-split emission signal to the target object to be detected, and receive the reflected light spot and transmit the reflected light spot to the optical coupler; the second arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received local laser signal to obtain multiple components of beam-split local signals; the optical coupler is arranged on the substrate, and is used to couple the reflected light spot and the beam-split local signal to obtain a coupled signal; the photodetector is arranged on the substrate, and is used to receive the coupled signal and process the coupled signal. The multi-mode interference coupler can be used to realize the integrated transmission and reception of the photonic integrated chip, and a photonic integrated chip for lidar with high chip integration and chip working efficiency is obtained, laying the foundation for realizing the integrated transmission and reception of lidar.

[0051] Based on the same concept of the present invention, the present invention also provides a laser radar using a photon integrated chip. Figure 3 Provide explanation.

[0052] Figure 3 It is a schematic diagram of the structure of a laser radar using a photon integrated chip provided by the present invention.

[0053] In an exemplary embodiment of the present invention, Figure 3 It can be seen that the laser radar 10 using the photon integrated chip may include a photon integrated chip 100 and a beam expanding thin lens 200, wherein: Figure 3 The dotted central axis line in is used to represent the lens optical axis of the beam expanding thin lens 200 .

[0054] In one embodiment, the beam expanding thin lens 200 can be arranged between the photonic integrated chip 100 and the target object to be detected, wherein the beam splitting transmission signal emitted by the multimode interference coupler 140 is emitted to the target object to be detected after passing through the beam expanding thin lens 200 and is reflected by the target object to be detected to form a reflection spot, so that the reflection spot is transmitted to the optical coupler 150 through the multimode interference coupler 140, and the reflection spot and the beam splitting local signal are coupled based on the optical coupler 150 to obtain a coupling signal, and the coupling signal is processed based on the photodetector 160 to obtain a detection result of the target object to be detected.

[0055] In the application process, the above-mentioned embodiment is used as an example for explanation. A laser light source can generate a laser signal (corresponding to an emission laser signal), which is evenly divided into N beams (4 beams are shown in the figure as an example) after passing through the first arrayed waveguide grating 120. The light is emitted as a signal output through the emission end 1403 of the multimode interference coupler 140, and is expanded by the beam expansion thin lens 200 and irradiated onto the target object to be detected. After the emission laser (corresponding to the emission signal after beam splitting) is reflected by the target object to be detected by Lambertian reflection, part of the reflected light will be re-converged in front of the multimode interference coupler 140 through the beam expansion thin lens 200 to form a larger light spot (corresponding to the reflected light spot) than the emission light (corresponding to the emission signal after beam splitting). After this light spot is received by the receiving end 1402 of the same multimode interference coupler 140, it is combined with the local light source (corresponding to the local signal after beam splitting) evenly split by the second arrayed waveguide grating 130, and then sent to the photodetector (corresponding to the photodetector 160) for subsequent signal processing to obtain the detection result of the target object to be detected. The laser radar using the photon integrated chip provided by the present invention realizes the integration of transmission and reception and improves the integration level of the radar.

[0056] In another exemplary embodiment of the present invention, the laser radar may further include a laser light source (which may correspond to Figure 3The black solid line incident on the first arrayed waveguide grating) and the local laser light source (which can correspond to Figure 3 The black solid line incident on the second array waveguide grating in the figure), wherein the emitting laser light source can be used to form an emitting laser signal, so that the emitting laser signal is subjected to beam splitting processing to obtain a splitted emitting signal; the local laser light source can be used to form a local laser signal, so that the local laser signal is subjected to beam splitting processing to obtain a splitted local signal.

[0057] In another exemplary embodiment of the present invention, a plurality of multimode interference couplers 140 may be symmetrically distributed along the optical axis of the beam expander thin lens on the substrate 110 of the photonic integrated chip 100. In this embodiment, by continuously multiplexing the multimode interference couplers 140 in parallel, the multimode interference couplers 140 are symmetrically distributed along the optical axis of the lens to form an array, thereby realizing the arraying of radars.

[0058] According to the foregoing description, the laser radar using photonic integrated chips provided by the present invention has the following advantages: the laser radar realizes integrated transmission and reception, saves space and material costs, and the entire system is more concise; the waveguide structure of the entire system is a silicon nitride waveguide, which has low loss and high mode matching with the laser, which can reduce loss and increase transmission power; the use of an array-type multi-mode interference coupler design can further improve integration.

[0059] Based on the same concept of the present invention, the present invention also provides a detection method, which will be combined with Figure 4 Provide explanation.

[0060] Figure 4 It is a flow chart of the detection method provided by the present invention.

[0061] In an exemplary embodiment of the present invention, the detection method can be applied to a laser radar using a photon integrated chip, combined with Figure 4 It can be seen that the detection method may include step 410 to step 430, and each step will be introduced below.

[0062] In step 410 , a target object to be detected is determined.

[0063] In step 420, a laser radar using a photonic integrated chip is called to transmit a split transmission signal to a target object to be detected, and a reflected light spot corresponding to the split transmission signal is obtained through reflection by the target object to be detected.

[0064] In step 430, a coupling signal is obtained based on the reflected light spot and the local signal after beam splitting, and a detection position of the target object to be detected is determined based on the coupling signal.

[0065] In one embodiment, a target object to be detected can be determined, and a laser radar using a photon integrated chip can be called to transmit a split transmission signal to the target object to be detected, wherein the split transmission signal is obtained by beam splitting the transmission laser signal through a first arrayed waveguide grating. Further, a reflection spot corresponding to the split transmission signal is obtained through reflection from the target object to be detected.

[0066] In the application process, the transmitted signal after beam splitting can be transmitted to the target object to be detected through the input end of the multimode interference coupler; the reflected light spot is transmitted back to the multimode interference coupler through the transmitting end and the receiving end of the multimode interference coupler in sequence, and is transmitted to the optical coupler for wave combining processing. Among them, the reflected light spot is coupled with the end face of the entire multimode interference coupler (for the rolling transmitting end) and output by the receiving end, and then transmitted to the optical coupler.

[0067] Furthermore, based on the optical coupler, the reflected light spot and the local signal after beam splitting are combined to obtain a coupled signal, and based on the coupled signal, the detection position of the target object to be detected is determined. Among them, the local signal after beam splitting can be obtained by the second arrayed waveguide grating to split the local laser signal. Through this embodiment, integrated transmission and reception detection can be realized.

[0068] In another exemplary embodiment of the present invention, the reflection light spot may include multiple groups of reflection light spots transmitted to each optical coupler through each multimode interference coupler; the post-splitting local signal may include multiple groups of post-splitting local signals, wherein the number of groups of the post-splitting local signal is the same as the number of groups of the reflection light spots; Among them, based on the reflected light spot and the local signal after beam splitting, a coupling signal is obtained, and based on the coupling signal, the detection position of the target object to be detected is determined, which can be achieved in the following way: Performing coupling processing on multiple groups of reflected light spots and multiple groups of local signals after beamforming to obtain multiple groups of coupled signals; Based on the multiple sets of coupled signals, the detection position of the target object to be detected is determined.

[0069] In this embodiment, multiple groups of reflected light spots and multiple groups of post-beam local signals are coupled to obtain multiple groups of coupling signals, and the detection position of the target object to be detected is determined based on the multiple groups of coupling signals. The detection position of the target object to be detected can be determined in parallel, thereby improving the detection efficiency of determining the detection position of the target object to be detected.

[0070] Figure 5 It is a structural schematic diagram of the detection device provided by the present invention.

[0071] The detection device provided by the present invention is described below. The detection device described below and the detection method described above can be referenced to each other.

[0072] The following will be combined Figure 5 The structure of the detection device provided by the present invention is described.

[0073] In an exemplary embodiment of the present invention, the detection device can be applied to a laser radar using a photon integrated chip. Figure 5 It can be known that the detection device may include a determination module 510, a calling module 520, and a detection module 530, and each module will be introduced below.

[0074] The determination module 510 may be configured to determine a target object to be detected; The calling module 520 may be configured to call the laser radar using the photon integrated chip to transmit a split transmission signal to the target object to be detected, and obtain a reflected light spot corresponding to the split transmission signal through reflection from the target object to be detected; The detection module 530 may be configured to obtain a coupling signal based on the reflected light spot and the local signal after beam splitting, and determine the detection position of the target object to be detected based on the coupling signal.

[0075] In an exemplary embodiment of the present invention, the reflected light spot includes multiple groups of reflected light spots transmitted to each optical coupler through each multimode interference coupler; the post-splitting local signal includes multiple groups of post-splitting local signals, wherein the number of groups of the post-splitting local signals is the same as the number of groups of the reflected light spots; the detection module 530 can obtain a coupling signal based on the reflected light spot and the post-splitting local signal, and determine the detection position of the target object to be detected based on the coupling signal in the following manner: Performing coupling processing on multiple groups of reflected light spots and multiple groups of local signals after beamforming to obtain multiple groups of coupled signals; Based on the multiple sets of coupling signals, the detection position of the target object to be detected is determined.

[0076] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the detection method, which is applied to the laser radar using the photon integrated chip, and the detection method includes: determining the target object to be detected; calling the laser radar using the photon integrated chip to transmit a split-beam transmission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split-beam transmission signal through reflection from the target object to be detected; obtaining a coupled signal based on the reflected light spot and the split-beam local signal, and determining the detection position of the target object to be detected based on the coupled signal.

[0077] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0078] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the detection methods provided by the above-mentioned methods. The detection method is applied to a laser radar using a photon integrated chip. The detection method includes: determining a target object to be detected; calling the laser radar using a photon integrated chip to transmit a split signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split signal after reflection from the target object to be detected; obtaining a coupled signal based on the reflected light spot and the local signal after splitting, and determining the detection position of the target object to be detected based on the coupled signal.

[0079] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the detection method provided by the above-mentioned methods. The detection method is applied to a laser radar using a photon integrated chip. The detection method includes: determining a target object to be detected; calling the laser radar using a photon integrated chip to transmit a split signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split signal through reflection from the target object to be detected; obtaining a coupled signal based on the reflected light spot and the split local signal, and determining the detection position of the target object to be detected based on the coupled signal.

[0080] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0081] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photonic integrated chip, characterized in that: The photon integrated chip comprises: a substrate, a first arrayed waveguide grating, a second arrayed waveguide grating, a plurality of multimode interference couplers, a plurality of optical couplers, and a photodetector, wherein: The first arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received emission laser signal to obtain a multi-component beam-forming emission signal, wherein the number of beam splitting processing performed on the emission laser signal corresponds to the number of the multimode interference couplers; The multimode interference coupler is disposed on the substrate, and is used to receive the post-splitting transmission signal, transmit the post-splitting transmission signal to the target object to be detected, and receive a reflected light spot and transmit the reflected light spot to the optical coupler, wherein the reflected light spot is formed after the post-splitting transmission signal is transmitted to the target object to be detected; The second arrayed waveguide grating is arranged on the substrate, and is used to perform beam splitting processing on the received local laser signal to obtain multiple groups of beam-split local signals, wherein the number of beam splitting processing performed on the local laser signal corresponds to the number of the multimode interference couplers; The optical coupler is arranged on the substrate and is used to couple the reflected light spot and the local signal after beam splitting to obtain a coupled signal; The photoelectric detector is arranged on the substrate, and is used for receiving the coupled signal and processing the coupled signal.

2. The photonic integrated chip according to claim 1, characterized in that: A plurality of multimode interference couplers are arranged on the substrate at preset intervals, wherein the interval size of the preset intervals is determined according to the size of the reflection light spot, so that the reflection light spot can be received individually by the multimode interference coupler corresponding to the reflection light spot.

3. The photonic integrated chip according to claim 1 or 2, characterized in that: The length of the multimode interference coupler is set to a first target length, wherein the first target length is determined based on the width of the multimode interference coupler, the width of the incident end formed by the incident end of the multimode interference coupler formed by the incident signal after beam splitting onto the multimode interference coupler, and the self-image effect of the multimode interference coupler, so that after the incident signal after beam splitting onto one side of the multimode interference coupler having the first target length, it is emitted from a position along the other side of the multimode interference coupler corresponding to the incident position of the incident signal after beam splitting.

4. The photonic integrated chip according to claim 1 or 2, characterized in that: The length of the multimode interference coupler is set to an integer multiple of a second target length, wherein the second target length is determined according to the spot size of the reflected light spot and the width of the multimode interference coupler.

5. The photonic integrated chip according to claim 1, characterized in that: The multimode interference coupler is composed of silicon nitride waveguides.

6. A laser radar using a photon integrated chip, characterized in that: The laser radar comprises a photonic integrated chip as claimed in any one of claims 1 to 5, and a beam expanding thin lens, wherein: The beam expanding thin lens is arranged between the photon integrated chip and the target object to be detected, wherein: The beam-splitting transmission signal emitted by the multimode interference coupler is emitted to the target object to be detected after passing through the beam expansion thin lens and forms a reflection light spot after being reflected by the target object to be detected, so that the reflection light spot is transmitted to the optical coupler through the multimode interference coupler, and the reflection light spot and the beam-splitting local signal are coupled and processed based on the optical coupler to obtain a coupling signal, and the coupling signal is processed based on the photodetector to obtain the detection result of the target object to be detected.

7. The laser radar using a photon integrated chip according to claim 6, characterized in that: The laser radar also includes a transmitting laser light source and a local laser light source, wherein: The emission laser light source is used to form an emission laser signal, so that the emission laser signal is subjected to beam splitting processing to obtain a post-beam splitting emission signal; The local laser light source is used to form a local laser signal, so that the local laser signal is processed by beam splitting to obtain a split local signal.

8. The laser radar using a photon integrated chip according to claim 6, characterized in that: A plurality of the multi-mode interference couplers are symmetrically distributed on the substrate of the photonic integrated chip along the lens optical axis of the beam expanding thin lens.

9. A detection method, characterized in that: The detection method is applied to the laser radar using the photon integrated chip as claimed in any one of claims 6 to 8, and the detection method comprises: Determine the target object to be detected; Calling the laser radar using the photon integrated chip to transmit a split-beam transmission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split-beam transmission signal through reflection from the target object to be detected; A coupling signal is obtained based on the reflected light spot and the local signal after beam splitting, and a detection position of the target object to be detected is determined based on the coupling signal.

10. The detection method according to claim 9, characterized in that: The reflected light spots include multiple groups of reflected light spots transmitted to each optical coupler through each multimode interference coupler; the post-beam splitting local signal includes multiple groups of post-beam splitting local signals, wherein the number of groups of the post-beam splitting local signals is the same as the number of groups of reflected light spots; The step of obtaining a coupling signal based on the reflected light spot and the local signal after beam splitting, and determining the detection position of the target object to be detected based on the coupling signal, specifically includes: Performing coupling processing on multiple groups of reflected light spots and multiple groups of local signals after beamforming to obtain multiple groups of coupled signals; Based on the multiple sets of coupling signals, the detection position of the target object to be detected is determined.

11. A detection device, characterized in that: The detection device is applied to the laser radar using the photon integrated chip as claimed in any one of claims 6 to 8, and the detection device comprises: A determination module, used for determining a target object to be detected; A calling module, used for calling the laser radar using the photon integrated chip to transmit a split-beam transmission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split-beam transmission signal through reflection from the target object to be detected; The detection module is used to obtain a coupling signal based on the reflected light spot and the local signal after beam splitting, and determine the detection position of the target object to be detected based on the coupling signal.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the detection method according to any one of claims 9 to 10 is implemented.

13. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the detection method according to any one of claims 9 to 10 is implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the detection method according to any one of claims 9 to 10 is implemented.

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