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公开(公告)号：US20210293934A1
公开(公告)日：2021-09-23
申请号：US16821591
申请日：2020-03-17
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Lingxuan Zhang
IPC: G01S7/481 , G01S7/4911
Abstract: A switched optical phased array based beam steering LiDAR (light detection and ranging) system includes an integrated photonics optical phased array (OPA) that includes an optical switching network for selectively connecting a large number of 1D scanning (in a first direction or field-of-view) antenna arrays to a light source. Each array is configured to emit light in a predefined angle of a second direction or field-of-view and can be switched individually to connect to the light source. At any given time, the phase shifters of only one such array, i.e. the one that is switched to connect the light source, are actively adjusted by the control circuits, so that the active power consumption is greatly reduced. The LiDAR system also includes a photo sensor receiver, other control and signal processing circuits, and other necessary optical and mechanical components.
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Patent Agency Ranking
公开(公告)号：US20190219888A1
公开(公告)日：2019-07-18
申请号：US15874779
申请日：2018-01-18
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Lingxuan Zhang , Ningning Feng
IPC: G02F1/295
CPC classification number: G02F1/2955 , G02F2201/066 , G02F2201/302 , G02F2203/50
Abstract: An on-chip optical phased array includes an array of photonic antenna units connected in series by photonic waveguides and arranged in a two-dimensional array to produce complex still and scanning optical patterns through optical interference effect. Each antenna unit includes an output photonic antenna (e.g. grating antenna), and a waveguide phase shifter for adjusting the optical phase of the optical beam output by the antenna unit. The grating antenna and the waveguide phase shifter are formed in the same optical wave guiding layer which includes a core layer between two cladding layers. The grating antennas may be a shallow-etched structure or a deep-etched edge-modulated grating. The optical phased array, including the array of photonic antenna units and the electrodes that connect and provide electrical power to them, can be made on a single chip of silicon using complementary metal-oxide-semiconductor (CMOS) or compatible fabrication processes.
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公开(公告)号：US11573294B2
公开(公告)日：2023-02-07
申请号：US16821591
申请日：2020-03-17
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Lingxuan Zhang
IPC: H04B10/00 , G01S7/481 , G01S7/4911 , G01S17/32
Abstract: A switched optical phased array based beam steering LiDAR (light detection and ranging) system includes an integrated photonics optical phased array (OPA) that includes an optical switching network for selectively connecting a large number of 1D scanning (in a first direction or field-of-view) antenna arrays to a light source. Each array is configured to emit light in a predefined angle of a second direction or field-of-view and can be switched individually to connect to the light source. At any given time, the phase shifters of only one such array, i.e. the one that is switched to connect the light source, are actively adjusted by the control circuits, so that the active power consumption is greatly reduced. The LiDAR system also includes a photo sensor receiver, other control and signal processing circuits, and other necessary optical and mechanical components.
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公开(公告)号：US10591802B2
公开(公告)日：2020-03-17
申请号：US15874779
申请日：2018-01-18
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Lingxuan Zhang , Ningning Feng
Abstract: An on-chip optical phased array includes an array of photonic antenna units connected in series by photonic waveguides and arranged in a two-dimensional array to produce complex still and scanning optical patterns through optical interference effect. Each antenna unit includes an output photonic antenna (e.g. grating antenna), and a waveguide phase shifter for adjusting the optical phase of the optical beam output by the antenna unit. The grating antenna and the waveguide phase shifter are formed in the same optical wave guiding layer which includes a core layer between two cladding layers. The grating antennas may be a shallow-etched structure or a deep-etched edge-modulated grating. The optical phased array, including the array of photonic antenna units and the electrodes that connect and provide electrical power to them, can be made on a single chip of silicon using complementary metal-oxide-semiconductor (CMOS) or compatible fabrication processes.
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公开(公告)号：US11579299B2
公开(公告)日：2023-02-14
申请号：US16372758
申请日：2019-04-02
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Ningning Feng
Abstract: A 3D range imaging method using a LiDAR system includes sequentially generating multiple far field patterns to illuminate a target scene, each far field pattern including a plurality of light spots where each spot illuminates only a segment of a scene region unit that corresponds to a sensor pixel of the LiDAR receiver. Within each scene region unit, the multiple segments illuminated in different rounds are non-overlapping with each other, and they collectively cover the entire scene region unit or a part thereof. With each round of illumination, the signal light reflected from the scene is detected by the sensor pixels, and processed to calculate the depth of the illuminated segments. The calculation may take into consideration optical aberration which causes reflected light from an edge segment to be received by two sensor pixels. The depth data calculated from the sequential illuminations are combined to form a ranged image.
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公开(公告)号：US20200319340A1
公开(公告)日：2020-10-08
申请号：US16372758
申请日：2019-04-02
Applicant: Litexel Inc.
Inventor： Xiaochen Sun , Ningning Feng
Abstract: A 3D range imaging method using a LiDAR system includes sequentially generating multiple far field patterns to illuminate a target scene, each far field pattern including a plurality of light spots where each spot illuminates only a segment of a scene region unit that corresponds to a sensor pixel of the LiDAR receiver. Within each scene region unit, the multiple segments illuminated in different rounds are non-overlapping with each other, and they collectively cover the entire scene region unit or a part thereof. With each round of illumination, the signal light reflected from the scene is detected by the sensor pixels, and processed to calculate the depth of the illuminated segments. The calculation may take into consideration optical aberration which causes reflected light from an edge segment to be received by two sensor pixels. The depth data calculated from the sequential illuminations are combined to form a ranged image.
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