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

Abstract

The present invention provides a photonic integrated chip, a laser radar using the photonic integrated chip, and a detection method. The photonic integrated chip includes: a substrate, a first arrayed waveguide grating (AWG), a second arrayed waveguide grating (AWG), multiple multimode interference couplers (MIFs), multiple optical couplers (OFs), and a photodetector. The first arrayed waveguide grating (AWG) is used to split a transmitted laser signal to obtain multiple components of beamed transmitted signals; the MFIs are used to receive the beamed transmitted signals and transmit them to a target object to be detected, as well as receive reflected light spots and transmit them to the optical couplers. The second arrayed waveguide grating (AWG) is used to split a local laser signal to obtain multiple components of beamed local signals; the OFs are used to process the reflected light spots and the beamed local signals to obtain coupled signals; and the OFs are used to receive and process the coupled signals. This results in a photonic integrated chip for laser radars with a high chip integration density.

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] As we know from relevant technologies, current photonic integrated chips for LiDAR require circulators to transmit and receive signals. However, circulators are bulky and cannot be integrated onto chips, thus limiting further improvements in chip integration. Furthermore, the circulator structure introduces additional losses, reducing chip efficiency.

[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 photonic integrated chip, a laser radar using the photonic integrated chip, and a detection method, thereby obtaining a photonic integrated chip for laser radar with high chip integration and chip working efficiency, laying the foundation for realizing the integrated transmission and reception of the laser radar.

[0006] The present invention provides a photonic integrated chip, which 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 a received emission laser signal to obtain a plurality of beam-split emission signals, wherein the number of beam splits for 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-split emission signal and transmit the beam-split emission signal to a target object to be detected, as well as receive a reflected light spot and transmit the reflected light spot to a target object to be detected. The reflected light spot is transmitted to the optical coupler, wherein the reflected light spot is formed after the post-splitting emission 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 components of post-splitting local signals, wherein the number of beam splitting processing 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 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 reflected light spot, so that the reflected light spot is individually received by the multimode interference coupler corresponding to the reflected 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 splitting, and the self-image effect of the multimode interference coupler, so that the incident signal after splitting is incident on one side of the multimode interference coupler having the first target length and then emitted from a position on the other side of the multimode interference coupler corresponding to the incident position of the incident signal after 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 photonic integrated chip, wherein the laser radar includes a photonic integrated chip and a beam expanding thin lens, wherein the beam expanding thin lens is arranged between the photonic integrated chip and the target object to be detected, wherein the beam-splitting transmission signal emitted by the multi-mode 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 multi-mode 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 splitted 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 splitted 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 photonic integrated chip. The detection method includes: determining a target object to be detected; calling the laser radar using the photonic integrated chip to transmit a split-emission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split-emission signal through reflection from the target object to be detected; obtaining a coupled signal based on the reflected light spot and the split-emission 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 spots include multiple groups of reflected light spots transmitted to each optical coupler through each multimode interference coupler; the local signals after beam splitting include 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; obtaining a coupling signal based on the reflected light spots and the local signals after beam splitting, and determining the detection position of the target object to be detected based on the coupling signal, specifically includes: coupling processing of multiple groups of reflected light spots and multiple groups of local signals after beam splitting to obtain multiple groups of coupling signals; and determining the detection position of the target object to be detected based on the multiple groups of coupling signals.

[0016] The present invention also provides a detection device, which is applied to a laser radar using a photonic integrated chip. The detection device includes: a determination module, used to determine the target object to be detected; a calling module, used to call the laser radar using the photonic integrated chip to transmit a split signal to the target object to be detected, and obtain a reflected light spot corresponding to the split signal after reflection by the target object to be detected; a detection module, used to obtain a coupling 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 coupling 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-described detection methods when executing the computer program.

[0018] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements any of the above-mentioned detection methods when executed by a processor.

[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 one of the above detection methods.

[0020] The present invention provides a photonic integrated chip, a laser radar using the photonic integrated chip, and a detection method. The photonic integrated chip includes: a substrate, a first arrayed waveguide grating, a second arrayed waveguide grating, multiple multimode interference couplers, multiple 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, as well as 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 realize the integrated transmission and reception of the photonic integrated chip, and obtain a photonic integrated chip for lidar with high chip integration and chip working efficiency, 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, a brief introduction is given below to 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 any creative work.

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

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

[0024] Figure 3 It is a schematic structural diagram of a laser radar using a photonic 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:

[0029] 100: photonic integrated chip; 110: substrate; 120: first arrayed waveguide grating;

[0030] 130: second arrayed waveguide grating; 140: multimode interference coupler;

[0031] 150: Optocoupler; 160: Photodetector; 1401: Input terminal;

[0032] 1402: Receiver; 1403: Transmitter; 10: LiDAR using photonic integrated chip;

[0033] 200: Beam expanding thin lens. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The photonic integrated chip provided by the present invention can realize integrated transmission and reception with the help of a multi-mode interference coupler, thereby improving the integration of the chip. In addition, the lack of a circulator in the photonic integrated chip can also reduce 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 integrated transmission and reception of laser radar.

[0036] Figure 1 It is a schematic structural diagram of the photonic integrated chip provided by the present invention.

[0037] The following will be combined Figure 1 The structure of the photonic integrated chip provided by the present invention is described.

[0038] 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, multiple multimode interference couplers 140, multiple optical couplers 150, and a photodetector 160. Each module will be introduced below.

[0039] 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 transmit laser signal to obtain multiple beam-forming transmit signals, wherein the number of beam splitting processes performed on the transmit laser signal corresponds to the number of multimode interference couplers 140.

[0040] Combine 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 1 120).

[0041] In another embodiment, the multimode interference coupler 140 may be disposed on the substrate 110. The film interference coupler 140 may be configured to receive the split transmission signal and transmit the split transmission signal to the target object to be detected, as well as receive a 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.

[0042] Figure 2 It is a structural schematic diagram of the multimode interference coupler provided by the present invention.

[0043] The following will be combined Figure 2 The structure and application scenarios of the multimode interference coupler are explained.

[0044] In one embodiment, combining 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 As can be seen, the splitting transmit signal is transmitted through the input end 1401 of the multimode interference coupler 140 to the target object to be detected. The reflected light spot is then transmitted back to the multimode interference coupler 140 through the transmitting end 1403 and the receiving end 1402 of the multimode interference coupler 140, and then transmitted to the optical coupler 150 for multiplexing. The reflected light spot is coupled with the end face of the multimode interference coupler 140 (for the rolling transmitting end 1403) and output by the receiving end 1402.

[0045] 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 splits performed on the local laser signal corresponds to the number of multimode interference couplers.

[0046] Continue to combine Figure 1 As can be seen, the second arrayed waveguide grating 130 performs beam splitting processing on the received local laser signal to obtain four groups of beam-bundled local signals. These four groups of beam-bundled local signals are then transmitted to four optical couplers 150 for combined processing. It should be noted that the number of beams split for the local laser signal (e.g., four beams) is equal to the number of multimode interference couplers (e.g., four groups).

[0047] In another embodiment, an optical coupler 150 may be disposed on the substrate 110. The optical coupler 150 may be configured to couple the reflected light spot and the split local signal to generate a coupled signal. A photodetector 160 may be disposed on the substrate 110. The photodetector 160 may be configured to receive and process the coupled signal to detect the position of the target object.

[0048] The photonic integrated chip provided by the present invention includes: a substrate, a first arrayed waveguide grating (AWG), a second arrayed waveguide grating (AWG), multiple multimode interference couplers (MMIF), multiple optical couplers (OFC), and a photodetector. The first arrayed waveguide grating (AWG) is disposed on the substrate and is used to split a received transmitted laser signal to obtain multiple components of beamed transmitted signals. The multimode interference coupler is disposed on the substrate and is used to receive the beam-split transmitted signals and transmit them to a target object to be detected, as well as receive reflected light spots and transmit them to the optical coupler. The second arrayed waveguide grating (AWG) is disposed on the substrate and is used to split a received local laser signal to obtain multiple components of beamed local signals. The OFC is disposed on the substrate and is used to couple the reflected light spots with the beam-split local signals to obtain coupled signals. The photodetector is disposed on the substrate and is used to receive and process the coupled signals. The MIF coupler can realize the integrated transmission and reception of the photonic integrated chip, resulting in a photonic integrated chip for laser radar with high chip integration and chip operating efficiency, laying the foundation for realizing the integrated transmission and reception of laser radar.

[0049] 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 separately by the multimode interference coupler 140 corresponding to the reflection spot.

[0050] 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 crosstalk factors between different channels.

[0051] In another exemplary embodiment of the present invention, Figure 1 It can be seen 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 splitting being incident on the multimode interference coupler 140, and the self-image effect of the multimode interference coupler 140, so that the transmission signal after 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 splitting.

[0052] In one example, combining Figure 2 To illustrate, the first target length can be based on the width of the multimode interference coupler 140 (which can correspond to Figure 2The width of the transmitting end 1403 in the middle), the width of the incident end formed by the incident end 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. The multimode interference coupler 140 based on the first target length can inject the transmitting end signal (corresponding to Figure 2 The splitting emission signal incident on 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.

[0053] In yet another exemplary embodiment of the present invention, the length of the multimode interference coupler 140 can be set to an integer multiple of a second target length, where the second target length can be determined based on the size of the reflected light spot and the width of the multimode interference coupler 140. In practice, 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 at maximum power while minimizing the reflected light spot received by the input end 1401 of the multimode interference coupler 140.

[0054] In another exemplary embodiment of the present invention, the multimode interference coupler 140 may be formed of a silicon nitride waveguide. A multimode interference coupler formed of a silicon nitride waveguide can have low loss and high mode matching with the laser radar, thereby reducing loss and increasing transmission power.

[0055] 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-transmitted 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 the target object to be detected, as well as 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-transmitted local signals; 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 multi-mode interference coupler can realize the integrated transmission and reception of the photonic integrated chip, and obtain a photonic integrated chip for lidar with high chip integration and chip working efficiency, laying the foundation for realizing the integrated transmission and reception of lidar.

[0056] 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.

[0057] Figure 3 It is a schematic structural diagram of a laser radar using a photonic integrated chip provided by the present invention.

[0058] 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 line in FIG. 1 is used to represent the optical axis of the beam expanding thin lens 200 .

[0059] 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 coupled signal, and the coupled signal is processed based on the photodetector 160 to obtain a detection result of the target object to be detected.

[0060] In practice, continuing with the previously described embodiment as an example, a laser light source can generate a laser signal (corresponding to a transmitted laser signal). After passing through the first arrayed waveguide grating 120, it is evenly split into N beams (four beams are shown as an example). These beams are then transmitted through the transmitting end 1403 of the multimode interference coupler 140 as signal output. After being expanded by the beam expander lens 200, they are irradiated onto the target object to be detected. After the transmitted laser light (corresponding to the transmitted signal after splitting) undergoes Lambertian reflection from the target object, a portion of the reflected light is refocused by the beam expander lens 200 back into the front of the multimode interference coupler 140, forming a larger light spot (corresponding to a reflected light spot) than the transmitted light (corresponding to the transmitted signal after splitting). This light spot is received by the receiving end 1402 of the same multimode interference coupler 140. It is then combined with the local light source (corresponding to the local signal after splitting) evenly split by the second arrayed waveguide grating 130, processed by the optical coupler 150, and then transmitted to the photodetector (corresponding to the photodetector 160) for subsequent signal processing to obtain a detection result of the target object. 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.

[0061] 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 , wherein the transmitting laser light source can be used to form an transmitting laser signal, so that the transmitting laser signal is subjected to beam splitting processing to obtain a split transmitting signal; and 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 split local signal.

[0062] In another exemplary embodiment of the present invention, multiple multimode interference couplers 140 can 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 an array radar.

[0063] 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 makes the entire system 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 the integration.

[0064] 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.

[0065] Figure 4 It is a flow chart of the detection method provided by the present invention.

[0066] In an exemplary embodiment of the present invention, the detection method can be applied to a laser radar using a photonic integrated chip, combined with Figure 4 It can be seen that the detection method may include steps 410 to 430, and each step will be introduced below.

[0067] In step 410 , a target object to be detected is determined.

[0068] 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.

[0069] In step 430 , a coupling signal is obtained based on the reflected light spot and the split local signal, and a detection position of the target object to be detected is determined based on the coupling signal.

[0070] In one embodiment, a target object to be detected can be identified, and a laser radar using a photonic integrated chip can be used to transmit a split transmission signal toward the target object. The split transmission signal is obtained by splitting the transmission laser signal through a first arrayed waveguide grating. Furthermore, the signal is reflected by the target object to produce a reflected light spot corresponding to the split transmission signal.

[0071] In practice, the splitting transmit signal is transmitted through the input of the multimode interference coupler to the target object to be detected. The reflected light spot is then transmitted back to the multimode interference coupler through the transmitting and receiving ends of the multimode interference coupler, and then transmitted to the optical coupler for wave combining. The reflected light spot is coupled with the end face of the multimode interference coupler (for the rolling transmitting end) and output by the receiving end, where it is transmitted to the optical coupler.

[0072] Furthermore, an optical coupler is used to combine the reflected light spot and the split local signal to generate a coupled signal, and the detection position of the target object is determined based on the coupled signal. The split local signal can be generated by splitting the local laser signal using a second arrayed waveguide grating. This embodiment enables integrated transceiver detection.

[0073] In another exemplary embodiment of the present invention, the reflected light spots may include multiple groups of reflected light spots transmitted to each optical coupler through each multimode interference coupler; the split local signal may include multiple groups of split local signals, wherein the number of groups of the split local signals is the same as the number of groups of the reflected light spots;

[0074] 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:

[0075] Performing coupling processing on multiple groups of reflected light spots and multiple groups of post-beam local signals to obtain multiple groups of coupled signals;

[0076] Based on the multiple sets of coupled signals, the detection position of the target object to be detected is determined.

[0077] In this embodiment, multiple groups of reflected light spots and multiple groups of post-beam local signals are coupled to obtain multiple groups of coupled signals, and the detection position of the target object to be detected is determined based on the multiple groups of coupled 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.

[0078] Figure 5 It is a structural schematic diagram of the detection device provided by the present invention.

[0079] 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.

[0080] The following will be combined Figure 5 The structure of the detection device provided by the present invention is described.

[0081] In an exemplary embodiment of the present invention, the detection device can be applied to a laser radar using a photonic integrated chip. Figure 5 It can be seen that the detection device may include a determination module 510, a calling module 520, and a detection module 530. Each module will be introduced below.

[0082] The determination module 510 may be configured to determine a target object to be detected;

[0083] The calling module 520 may be configured to call the laser radar using the photonic 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 after reflection from the target object to be detected;

[0084] The detection module 530 may be configured to obtain a coupling signal based on the reflected light spot and the split local signal, and determine a detection position of the target object to be detected based on the coupling signal.

[0085] In an exemplary embodiment of the present invention, the reflected light spots include multiple groups of reflected light spots transmitted to each optical coupler through each multimode interference coupler; the split local signal includes multiple groups of split local signals, wherein the number of groups of the split local signals is the same as the number of groups of the reflected light spots; the detection module 530 can obtain a coupled signal based on the reflected light spots and the split local signals, and determine the detection position of the target object to be detected based on the coupled signal in the following manner:

[0086] Performing coupling processing on multiple groups of reflected light spots and multiple groups of post-beam local signals to obtain multiple groups of coupled signals;

[0087] Based on the multiple sets of coupled signals, a detection position of the target object to be detected is determined.

[0088] Figure 6 An example of a physical structure diagram of an electronic device is shown below. Figure 6As shown, the electronic device may include: a processor 610, a communications interface 620, a memory 630, and a communications bus 640, wherein the processor 610, the communications interface 620, and the memory 630 communicate with each other via the communications bus 640. The processor 610 may call logic instructions in the memory 630 to execute a detection method, which is applied to a laser radar using a photonic integrated chip. The detection method includes: determining a target object to be detected; calling the laser radar using the photonic integrated chip to transmit a split transmission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split transmission signal after 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.

[0089] Furthermore, the logic instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion 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 for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0090] On the other hand, the present invention also provides a computer program product, which includes a computer program, and 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 methods. The detection method is applied to a laser radar using a photonic integrated chip, and the detection method includes: determining the target object to be detected; calling the laser radar using the photonic 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 by 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.

[0091] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the detection method provided by the above-mentioned methods, wherein the detection method is applied to a laser radar using a photonic integrated chip, and the detection method includes: determining the target object to be detected; calling the laser radar using the photonic 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 by 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.

[0092] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0093] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0094] 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 various embodiments of the present invention.

Claims

1. A photonic integrated chip, characterized in that: The photonic 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 provided on the substrate and is used to perform beam splitting processing on the received transmission laser signal to obtain a multi-component beam-transmitted signal, wherein the number of beam splits performed on the transmission laser signal corresponds to the number of the multimode interference couplers; The multimode interference coupler is provided on the substrate, and is used to receive the beam-splitting transmission signal and transmit the beam-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 beam-splitting transmission signal is transmitted to the target object to be detected; The second arrayed waveguide grating is provided 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 splits performed on the local laser signal corresponds to the number of the multimode interference couplers; The optical coupler is provided 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 photodetector is arranged on the substrate, and is used to receive the coupled signal and process 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 is received solely 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 beam-splitting transmission signal, and the self-image effect of the multimode interference coupler, so that the incident beam-splitting transmission signal is emitted from a position on the other side of the multimode interference coupler corresponding to the incident position of the incident beam-splitting transmission signal after the incident beam-splitting signal is emitted from the other side of the multimode interference coupler.

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 photonic integrated chip, characterized in that: The laser radar comprises the photonic integrated chip according to any one of claims 1 to 5, and a beam expanding thin lens, wherein: The beam expanding thin lens is arranged between the photonic 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 a detection result of the target object to be detected.

7. The laser radar using a photonic 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 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 beam-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 split local signal.

8. The laser radar using a photonic integrated chip according to claim 6, characterized in that: The plurality of multimode interference couplers are symmetrically distributed on the substrate of the photonic integrated chip along the 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 photonic integrated chip according to any one of claims 6 to 8, and the detection method includes: Determine the target object to be detected; Invoking the laser radar using the photonic integrated chip to transmit a split transmission signal to the target object to be detected, and obtaining a reflected light spot corresponding to the split transmission signal after 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 split local signal includes multiple groups of split local signals, wherein the number of groups of the split 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 split local signal, and determining a 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 post-beam local signals to obtain multiple groups of coupled signals; Based on the multiple sets of coupled signals, a 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 according to any one of claims 6 to 8, and the detection device includes: A determination module, used to determine the target object to be detected; a calling module, configured to call the laser radar using the photonic 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 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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