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1.发明申请公开(公告)号：US20220334227A1
公开(公告)日：2022-10-20
申请号：US17516398
申请日：2021-11-01
发明人： Vladimir DAVYDENKO
IPC分类号： G01S7/481 , G01S17/931 , G01S17/42 , G01S17/58
摘要： A device for scanning range measurement to an object has a light source that generates an optical output signal having a varying frequency. A plurality of optical processing units are connected optically in parallel to the light source. Each processing unit has an optical distribution matrix with a plurality of optical switches that distribute the optical output signals from the light source selectively to different optical waveguides. A plurality of free space couplers outcouple the optical output signals into the free space, and couple optical output signals, which were reflected on the object, into the associated optical waveguides as optical measurement signals. A polarization sensitive light splitter directs the optical measurement signals detectors that detect a superposition of the optical measurement signals with the optical output signals supplied via a local oscillator light path.
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公开(公告)号：US20220413098A1
公开(公告)日：2022-12-29
申请号：US17359319
申请日：2021-06-25
发明人： Frank HÖLLER , Peter WESTPHAL
IPC分类号： G01S7/48 , G01S17/34 , G01S17/58 , G01S17/931
摘要： The invention relates to a system and a method for simultaneous range and velocity measurement in an FMCW LiDAR system. A first light source (16) produces first light having a first frequency that varies according to a first chirp rate. A second light source (18) produces second light having a second frequency that is constant or that varies according to a second chirp rate being different from the first chirp rate. Measuring light obtained by combining the first and second light therefore has two different frequency components during a measurement interval. A splitter (22) separates the measuring light into reference light and output light, and a scanning unit (28) directs the output light towards an object (12) and receives input light that is obtained by reflection of the output light at the object (12). A detector (32) detects a superposition of the reference light and the input light. A computing unit (34) computes unambiguously the range and relative velocity by analyzing beat frequencies resulting from the superposition, wherein ambiguities due to Doppler frequency shifts are removed by performing a decision tree analysis.
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公开(公告)号：US11237254B2
公开(公告)日：2022-02-01
申请号：US17228117
申请日：2021-04-12
发明人： Vladimir Davydenko
摘要： A device for scanning measurement of a distance to an object has a light source, which generates an optical output signal having a time-varying frequency. The device includes multiple optical processing units, which are connected optically in parallel to the light source. Each processing unit has an optical distribution matrix including multiple optical switches that distribute optical output signals selectively onto different optical waveguides. Optical output signals are outcoupled into the free space via free space couplers and optical output signals reflected on the object are coupled as optical measurement signals into the waveguides. A detector detects a superposition of the optical measurement signal and the optical output signal generated by the light source. A circulator directs optical output signals supplied by the light source to the distribution matrix and optical measurement signals coming from the distribution matrix to the detector.
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公开(公告)号：US20210364607A1
公开(公告)日：2021-11-25
申请号：US17228117
申请日：2021-04-12
发明人： Vladimir DAVYDENKO
IPC分类号： G01S7/481 , G01S17/931 , G01S17/32 , G02F1/31
摘要： A device for scanning measurement of a distance to an object has a light source, which generates an optical output signal having a time-varying frequency. The device includes multiple optical processing units, which are connected optically in parallel to the light source. Each processing unit has an optical distribution matrix including multiple optical switches that distribute optical output signals selectively onto different optical waveguides. Optical output signals are outcoupled into the free space via free space couplers and optical output signals reflected on the object are coupled as optical measurement signals into the waveguides. A detector detects a superposition of the optical measurement signal and the optical output signal generated by the light source. A circulator directs optical output signals supplied by the light source to the distribution matrix and optical measurement signals coming from the distribution matrix to the detector.
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公开(公告)号：US11009593B1
公开(公告)日：2021-05-18
申请号：US17022522
申请日：2020-09-16
发明人： Vladimir Davydenko
IPC分类号： G01C3/08 , G01S7/481 , G01S17/32 , G02F1/31 , G01S17/931
摘要： A device for scanning measurement of a distance to an object has a light source, which generates an optical output signal having a time-varying frequency. The device includes multiple optical processing units, which are connected optically in parallel to the light source. Each processing unit has an optical distribution matrix including multiple optical switches that distribute optical output signals selectively onto different optical waveguides. Optical output signals are outcoupled into the free space via free space couplers and optical output signals reflected on the object are coupled as optical measurement signals into the waveguides. A detector detects a superposition of the optical measurement signal and the optical output signal generated by the light source. A circulator directs optical output signals supplied by the light source to the distribution matrix and optical measurement signals coming from the distribution matrix to the detector.
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公开(公告)号：US20230127941A1
公开(公告)日：2023-04-27
申请号：US17511361
申请日：2021-10-26
发明人： Sandeep UMMETHALA
摘要： An integrated on-chip polarization rotator splitter (26) comprises a waveguide polarization rotator (54) having a first and a second layer (62) that form a rib waveguide (66) together and are both made of silicon nitride. The first layer (62) has a first, a second and a third section. The first layer (64) has a first width (w1) that increases in the first section (S1), is constant in the second section (S1) and decreases in the third section (S3). The second layer (64) has a second width (w2) that continuously increases. The polarization rotator splitter (26) further includes a waveguide polarization splitter (61) comprising a first strip waveguide (71) and a second strip waveguide (72) that are separated by a gap (74). The first and second strip waveguides (71, 72) are also made of silicon nitride. The first and second strip waveguide (71, 72) form an asymmetric evanescent direction coupler.
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公开(公告)号：US20220334225A1
公开(公告)日：2022-10-20
申请号：US17534047
申请日：2021-11-23
摘要： A light source for a frequency-modulated continuous-wave (FMCW) LiDAR device is formed by a photonic integrated circuit and comprises a substrate and a multilayer structure. Formed in the multilayer structure is a semiconductor laser that is received in a recess etched into the multilayer structure. An optical path between the semiconductor laser and a reflector forms an external cavity for the semiconductor laser. The external cavity includes a variable attenuator causing an attenuation of light guided in the cavity optical waveguide. The external cavity may also or alternatively include an optical phase modulator.
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公开(公告)号：US20210316756A1
公开(公告)日：2021-10-14
申请号：US17229661
申请日：2021-04-13
发明人： Vladimir DAVYDENKO
摘要： A device for scanning measurement of the distance to an object comprises a light source that produces optical signals each having a varying frequency. An optical distribution matrix comprising optical switches and/or optical splitters distributes the optical signals simultaneously or successively onto optical output waveguides. A deflection optical unit deflects the optical signals when exiting from the optical output waveguides so that they are emitted in different directions from the device. A plurality of detectors detect a superposition of one of the optical signals produced by the light source with an optical signal which was reflected from the object. Input waveguides, which are independent of the output waveguides, guide the optical signals reflected from the object to the detectors while bypassing the optical distribution matrix. An evaluation unit determines a distance to the object from the superposition detected by the detectors.
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