WO2022167274A1 - Système optique - Google Patents

Système optique Download PDF

Info

Publication number
WO2022167274A1
WO2022167274A1 PCT/EP2022/051686 EP2022051686W WO2022167274A1 WO 2022167274 A1 WO2022167274 A1 WO 2022167274A1 EP 2022051686 W EP2022051686 W EP 2022051686W WO 2022167274 A1 WO2022167274 A1 WO 2022167274A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical system
light
antenna arrays
light source
environment
Prior art date
Application number
PCT/EP2022/051686
Other languages
German (de)
English (en)
Inventor
Jan Niklas Caspers
Marc Schmid
Simon Schneider
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2022167274A1 publication Critical patent/WO2022167274A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/292—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection by controlled diffraction or phased-array beam steering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G01S7/4815—Constructional features, e.g. arrangements of optical elements of transmitters alone using multiple transmitters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal

Definitions

  • the present invention relates to an optical system that is set up to scan a surface in an environment with the respective light beam by means of one or more light sources by emitting light beams in order to obtain information about the environment therefrom, the optical system having one or more lasers as the light sources included.
  • Integrated optical components promise to reduce otherwise typically large optical systems to a chip format and implement a wide variety of functionalities there.
  • the use of semiconductor process steps allows the production of large quantities.
  • Silicon photonics uses the largest component kit and uses well-known CMOS manufacturing processes.
  • beam deflection for a grating antenna can be achieved via changes in wavelength. These two deflection mechanisms are often used for 2D deflection with a 1D antenna array.
  • One of the target parameters for an optical phased array (OPA) is the size of the addressable field of view.
  • the maximum deflection angles for the two axis directions are in the range of approximately 80° ⁇ 15° for OPAs from the prior art.
  • OPA systems based on CMOS technology for deflecting beams in two axis directions can be realized in different ways.
  • One possibility is based on the production of a 2D antenna array.
  • By controlling the phase the deflection in both axis directions can be controlled.
  • An example of such a 2D OPA is given in F. Ashtiani et al. "N x N optical phased array with 2N phase Shifters", Optics Express 27 (19), pp 27183, 2019.
  • Said publication deals with a chip-based 2D optical phased array with deflection by phase shifting in two axis directions.
  • Another implementation example is discussed in a US patent by Michael Watts, namely US 9476981 B2.
  • the OPA is combined with a laser whose frequency is linearly modulated. This light is emitted and captured again and superimposed on the chip with light from the laser. Disadvantages of this architecture are the high level of complexity and the large amount of space required.
  • the two above-mentioned deflection mechanisms can be combined.
  • the deflection on the first axis is achieved by adjusting the phase position in the antennas and on the second axis by changing the wavelength.
  • C.V. Poulten “Long-Range LiDAR and Free-Space Data Communication With High-Performance Optical Phased Arrays", IEEE Journal of Selected Topics in Quantum Electronics 25(5), 2019, an example of an OPA designed in this way is presented.
  • This publication includes, among other things, an illustration of a 1D antenna array with a 2D control option by changing the phase or wavelength.
  • a tunable laser is used for the deflection in the second direction, which covers a very wide wavelength range from 1450 nm to 1640 nm. According to the publication, a deflection angle of 15° could be achieved on the corresponding axis.
  • the second direction of deflection is also usually achieved by changing the wavelength of the light source, e.g. by means of a tunable laser.
  • the wavelength range over which the laser can be tuned, AA, and at the same time meet all the necessary requirements (e.g. in terms of intensity, speed) is limited. Therefore, several tunable lasers with different wavelength of the light source.
  • an optical system of the type mentioned is made available, the optical system comprising a plurality of antenna arrays which are set up to receive the light emitted by a respectively assigned light source and to transmit it into the environment at different angles at a fixed wavelength radiate for scanning.
  • the optical system has the advantage that with the same number of, in particular tunable, lasers, a larger angular range can be addressed in the second axis direction, which corresponds to an increase in the field of view.
  • multiple lasers are often used in order to achieve sufficiently large beam deflection through the change in wavelength.
  • the optical system is based on a chip-based OPA, the output beam of which is set up to be steerable into the environment in one or more, preferably two, axis directions.
  • a beam deflection in a first axial direction 0 can be provided in particular with the aid of phase shifters, which can be provided in the optical system, via a relative adjustment of the phases in the individual antennas of the phase arrays.
  • a deflection in a second axis direction can preferably be done by tuning the laser wavelength: within a grating antenna of the antenna array, the light that comes from the light source and is propagated in a waveguide to the grating antenna is scattered.
  • a grating period or a grating constant A n it is possible to fix the emission angle for a given wavelength.
  • a maximum emission angle in the second axial direction is limited, for example, by a width AA of the tunable wavelength range of the one or more light sources.
  • each antenna array emits light at a fixed wavelength that differs from the wavelength of light emitted by the remaining antenna arrays.
  • the specified wavelength with which the light beam is radiated from each antenna array is therefore preferably uniquely specified for each antenna array in relation to the other antenna arrays.
  • a single tunable laser can be provided as the light source to span the entire field of view (FOV) in the second axis direction ⁇ P in an improved manner over the prior art.
  • the second axis direction ⁇ P is preferably that beam deflection axis for which the light beam emitted into the environment is controlled with a variation of the laser wavelength.
  • two or more lasers can be used in some embodiments. In a first case it is provided that the optical system provides a constant FoV. Then preferably only a single tunable laser (or less then advantageously of the same construction with lower demands on the tunable wavelength range) is used several different tunable lasers) provided in the optical system.
  • the optical system has, in particular, a number of tunable, identical lasers.
  • the FOV can be increased even further.
  • Two or more antenna arrays are then preferably assigned to each light source in order to deflect the light from the light source into the environment at different angles.
  • All light sources are preferably tunable lasers.
  • the wavelength of the light beam to be radiated can be defined by means of each light source.
  • all of the light sources are tuned to wavelengths that differ from the wavelengths of the other light sources, particularly in the second case mentioned above.
  • the tunable wavelength ranges AA should be identical.
  • the optical system is preferably set up to receive the respective light beam reflected in the environment.
  • the optical system can thus take on a dual function, namely to emit the light rays into the environment and also to receive them returning from the environment.
  • the optical system comprises an integrated optical circuit containing two or more antenna arrays assigned to the respective light source, the respective assigned antenna arrays being arranged to emit the light beam of the respective light source into the environment at an angle , which differs from the angles of the other antenna arrays associated with this light source.
  • a wide field of view can thus be scanned with relatively few light sources.
  • a preferred integrated optical circuit has a beam splitter, also referred to as a splitter.
  • a single light source can supply light to multiple antenna arrays via the beam splitter.
  • a preferred integrated optical circuit has two or more phase shifter blocks containing phase shifters. The phase shifter blocks are preferably den Antenna arrays and the beam splitter interposed.
  • the integrated optical circuit can contain the antenna arrays in such a way that each antenna array is assigned a grating constant A n that differs from the grating constants of the other antenna arrays.
  • the radiation angle can be set differently depending on the respective antenna array.
  • Integrated optical components of the integrated optical circuit can be made of silicon, Si3N4, SiO2, other optically transparent materials and combinations thereof. In this way, a good ability to transport light through the optical system is achieved.
  • a preferred integrated optical circuit is implemented as an OPA chip. This allows a high level of integration of the components.
  • the integrated optical circuit comprises two or more phase shifters, each of which is connected to one of the antenna arrays associated with the light source in order to generate the different angles.
  • the beam splitter can be optically connected to an associated phase shifter block via a respective waveguide.
  • Each phase shifter block can be optically connected to the associated antenna array via a further respective wave splitter. It is preferred that, after being coupled into an upstream waveguide, the laser light coming from the light source is distributed in the beam splitter on the OPA chip to a plurality of the blocks with N phase shifters. For example, 1024 individual antennas and phase shifters are preferred. In this way, 1024 digital control channels can advantageously be used.
  • Downstream of the phase shifter blocks are preferably n antenna arrays whose grid constants Ai, . . . , A n are designed in such a way that the radiation angles '+'1, .
  • the maximum area to be illuminated on a target surface in the environment can be significantly increased.
  • the respective FOVs of the individual antenna arrays can be directly adjacent so that there is no gap between the FOVs.
  • the projection surfaces of the individual antenna arrays can overlap in embodiments. In this way, a higher resolution or light intensity can be achieved in the overlapping areas.
  • the integrated optical circuit is arranged to modify the incident light over a respective unambiguously defined grating period of each of the antenna arrays in order to define one of the angles for emission by means of each of the grating periods. This allows each antenna array to be assigned a wavelength and thus radiate at a fixed angle, so that the signal can be assigned to exactly one of the radiating antenna arrays via the wavelength on the receiver side.
  • the light source assigned in each case is arranged externally to the integrated optical circuit on a separate carrier.
  • the light sources can be manufactured separately and easily replaced in the event of a defect, for example.
  • the laser may reside on the same chip as the integrated optics in embodiments. This allows a highly integrated structure with a reduced number of carriers.
  • the carrier for the light source is preferably a chip.
  • the antenna arrays associated with each light source are preferably arranged in groups such that only antennas of the same antenna array are arranged adjacent to one another.
  • a reduction in phase shifters can thus be achieved with the aid of a grouped architecture, which in particular allows the number of phase shifters to be reduced.
  • Two antenna arrays, each with uniform grid constants Ai and A2, are preferably implemented in consecutive blocks.
  • the lattice constants are preferably different. It is preferred that only one phase shifter is needed to control the phase of the Nth antenna in each of the arrays.
  • the number required for two antenna arrays is preferably halved to N/2. It is preferred that the light coming from the light source is distributed between the two arrays by means of a beam splitter.
  • the antennas can be unevenly distributed within the antenna arrays, in particular in the form of different, preferably non-periodic, distances from one another. In this way, a decoupling of the conflicting goals between the resolution (beam divergence) and the size of the field of view can be achieved.
  • the antenna arrays are preferably grouped by splitting the light from the light source into two or more waveguides in the integrated optical circuit, which waveguides have a fixed but different length for each of the antenna arrays.
  • each antenna array is equidistant from the light source, but each antenna array is at a different distance from the light source with respect to the remaining antenna arrays. In this way, the antenna arrays do not interfere with each other during operation. It is preferred that for this purpose each phase shifter is followed by a beam splitter which distributes the incident light from the associated light source to the associated antenna arrays via the waveguides.
  • the optical system is set up to use the same antenna arrays in each case for emitting the light into the environment and for receiving the reflected light from the environment in order to provide a monoaxial detection path.
  • a transmission path and a reception path of the optical system use largely identical structures of the integrated optical circuit.
  • the identical antenna array including the phase shifters is used for radiating and for receiving the light reflected in the environment.
  • receiver-antenna arrays are therefore at the same time transmitting-antenna arrays.
  • the complex light amplitudes of the reflected light returning in the reception path are mixed with the light from the light source in a local oscillator (LO).
  • LO local oscillator
  • the local oscillator is preferably tapped off immediately after the light source, so that light is mixed with light received again from the environment before it is emitted into the environment.
  • the advantage of the monoaxial arrangement is that each antenna array “looks” into the same solid angle when radiating and receiving.
  • the “line of sight” of each antenna array can be adjusted or defined by adjusting the phases within the phase shifters.
  • the optical system is set up to emit the light into the environment and to Receiving the reflected light from the environment to use separate antenna arrays to provide a biaxial detection path.
  • a separate optical circuit is reserved for the receive path in such embodiments.
  • the receiver-antenna arrays are therefore independent of the transmit-antenna arrays and preferably feed the light back to a local oscillator (LO), where the complex light amplitudes are mixed with one another.
  • LO local oscillator
  • the antenna array and the phase shifters are different between the transmission path and the reception path, so that a receiver-antenna array including the phase shifter is provided for each transmission-antenna array.
  • the receive path can at least essentially duplicate the transmit path in terms of structure.
  • the “viewing direction” of the transmitting and receiving antennas can advantageously be different in a biaxial detection path.
  • the optical system is a LiDAR system.
  • a preferred LiDAR system is a frequency-modulated continuous wave (FMCW) LiDAR system.
  • the light sources are then preferably continuous wave lasers.
  • the light sources are particularly preferably tunable continuous wave lasers.
  • each antenna array can be assigned light with a fixed wavelength that differs from the wavelength of the light from the other antenna arrays.
  • optical systems are provided in embodiments, for example in the robotics sector, in consumer 3D environment recognition, for determining filling levels, in the smart home sector and in every area of sensor technology or imaging that deals with the scanning of surfaces.
  • FIG. 1 shows a first embodiment of the invention
  • Figure 2 shows a detail of a second embodiment of the invention
  • Figure 3 shows a third embodiment of the invention
  • Figure 4 shows a fourth embodiment of the invention.
  • FIG. 1 shows an optical system 1 according to a first embodiment of the invention.
  • the optical system 1 is here, for example, a beam deflection device (optical phased array).
  • the optical system 1 can be a component in LiDAR systems, preferably in FMCW lidar systems.
  • LiDAR systems preferably in FMCW lidar systems.
  • FMCW lidar systems for the sake of simplicity, conventional structures of the beam deflector are omitted for clarity of description.
  • the optical system 1 from Figure 1 is set up to scan a surface 4 in an environment with the respective light beam 3a, 3b, 3c by means of one or more light sources 2 by emitting light beams 3a, 3b, 3c in order to obtain information about the environment therefrom to win.
  • the surface 4 is therefore not part of the optical system 1, but part of the environment.
  • the optical system 1 is set up to receive the respective light beam 3a, 3b, 3c reflected in the environment, only the transmission path of the optical system 1 being illustrated in FIG. 1 in order to first be able to clearly describe its special features.
  • the optical system 1 comprises a plurality of antenna arrays 5a, 5b, 5c, which are set up to receive the light emitted by a respectively assigned light source 2 and at a fixed wavelength at different angles, marked in the figures with 44, into the Emit environment for scanning. Only a single laser is illustrated here as the light source 2 .
  • the laser is a tunable laser. Not shown embodiments may include two or more light sources, so that the arrangement shown in FIG. 1, for example, can in principle be duplicated any number of times for each laser provided.
  • the optical system 1 includes an integrated optical circuit 6.
  • the integrated optical circuit 6 is implemented here as an OPA chip, for example.
  • the integrated optical circuit 6 contains two or more antenna arrays 5a, 5b, 5c assigned to the respective light source 2.
  • the respectively assigned antenna arrays 5a, 5b, 5c are arranged to emit the light beam of the respective light source 2 into the environment at an angle that differs from the angles of the other antenna arrays 5a, 5b, 5c assigned to this light source 2 .
  • the integrated optical circuit 6 comprises two or more phase shifters 7a, 7b, 7c, here three, which are each connected to one of the antenna arrays 5a, 5b, 5c assigned to the light source 2 in order to generate the different angles.
  • a beam splitter 8 is interposed between the respective light source 2 and the phase shifters 5a, 5b, 5c in order to split the light coming from the light source 2 onto the phase shifters 7a, 7b, 7c.
  • the light source 2 and the beam splitter 8, the beam splitter 8 and the phase shifters 7a, 7b, 7c and the phase shifters 7a, 7b, 7c and the associated antenna arrays 5a, 5b, 5c are connected to one another by means of optical fibers in order to enable light transmission between them to allow.
  • the OPA chip of the integrated optical circuit 6 comprises the beam splitter 8, the phase shifters 7a, 7b, 7c and the antenna arrays 5a, 5b, 5c as well as a coupling input 9 for the light coming from the light source 2.
  • the associated light source 2 is arranged externally to the integrated optical circuit 6 on a separate carrier 10 .
  • the light source 2 can be arranged on the same carrier as the integrated optical circuit 6 .
  • the integrated optical circuit 6 is arranged so that the light coming from the light source 2, i.e. the light coming from the light source 2 and coupled into the integrated optical circuit 6, which light is to be emitted into the environment, over a respectively clearly defined grating period, in denoted by A n in the figures, to modify each antenna array 5a, 5b, 5c in order to define an angle for radiating by means of each of the grating periods.
  • the surface 4 shown on the right edge of Figure 1 illustrates how in the In the world, the three tuned light beams 3a, 3b, 3c, which are emitted by the associated antenna arrays 5a, 5b, 5c, scan the surface 4 at different angles.
  • FIG. 1 is an exemplary illustration of the OPA with three differently designed antenna arrays 5a, 5b, 5c, realized in an integrated optical circuit 6.
  • the range of all possible projection points of a specific antenna array 5a, 5b, 5c on the Target surface 4 is encoded in the figures with the respective lattice constant Ai, A2, A3.
  • the antenna arrays 5a, 5b, 5c which are assigned to each light source 2 are arranged in groups .
  • the antenna arrays 5a, 5b, 5c are grouped in that in the integrated optical circuit 6, the light from the light source 2 is divided into two or more waveguides 13, the for each of the antenna arrays 5a, 5b, 5c a fixed, but have different lengths.
  • a multiplicity of beam splitters 8 are provided for dividing the light onto the waveguides 13 .
  • Two antennas 12 from two different antenna arrays 5a, 5b are optically connected to each beam splitter 8, via waveguides 13 of different lengths.
  • the waveguides 13, which lead from the associated beam splitter 8 to antennas 12, which have the same antenna array 5a, 5b are assigned are of equal length.
  • the antennas 12 which are associated with each antenna array 5a, 5b are equidistant from the light source 2.
  • each antenna array 5a, 5b is related to the remaining antenna arrays 5a, 5b at different distances from the light source 2.
  • antenna arrays 5a, 5b are illustrated by way of example, but three or more antenna arrays 5a, 5b, 5c can also be arranged in groups, for example by arranging three or more waveguides 13 on each beam splitter 8, which are different in length from one another, but are of the same length for each antenna array 5a, 5b. If the optical device then has two or more such beam splitters 8, each with three waveguides 13 leading to antennas 12, three groups of antenna arrays 5a, 5b, 5c can be formed, for example, so that only antennas 12 of the same antenna arrays 5a, 5b , 5c are arranged adjacent to each other.
  • Another solution is to use only beamsplitters 8 each with two waveguides 13, but to use a first length and a second length of waveguides 13 on some of the beamsplitters 8 and the first length and on others of the beamsplitters to use a third length of waveguides 13 to connect to the antennas 12.
  • three groups of antenna arrays 5a, 5b, 5c can also be arranged at different distances from the light source 2, so that only antennas 12 of the same antenna array 5a, 5b, 5c are arranged adjacent to one another.
  • the optical system 1 is set up to use the same antenna arrays 5a, 5b, 5c to emit the light into the environment and to receive the reflected light from the environment in order to provide a monoaxial detection path , which is marked here with Tx/Rx.
  • the complex light amplitudes of the light returning in the receiving path are mixed with the light from the light source 2 in a respective local oscillator 14a, 14b, 14c.
  • a further optical circuit 15 for the reception path, identified by Rx is provided.
  • the optical system 1 in the fourth embodiment is set up to have separate antenna arrays 5a, 5b, 5c, 16a, 16b, 16c for emitting the light into the environment and for receiving the reflected light from the environment use to provide a biaxial detection path.
  • the antenna array and the respectively assigned phase shifter are different between the transmission path Tx and the reception path Rx, so that for each antenna array 5a, 5b, 5c, identified by Tx-An, the transmission antenna arrays are a detection antenna Array 16a, 16b, 16c, labeled Rx-An, each including respective detection phase shifters 17a, 17b, 17c is added.
  • the same phase shifters and antenna arrays are not used both for radiating into the environment and for receiving from the environment.
  • the “viewing direction” of the transmission and reception antennas of the antenna arrays 5a, 5b, 5c in the transmission path or of the detection antenna arrays 16a, 16b, 16c in the reception path can therefore be different in the fourth embodiment.
  • the antenna array 5a, 5b, 5c “looks” into the same solid angle when radiating and receiving.
  • the further optical circuit 15 can be implemented in the same OPA chip as the optical circuit 6. As shown in FIG. 4, this results in a highly integrated packaging solution.
  • the invention makes it possible to address a larger angular range in the second axis direction in an optical system 1 with the same number of tunable lasers 2, which corresponds to an increase in the field of view.
  • a constant field of view results in a reduced number of laser light sources 2.
  • the system complexity is further reduced by designing the electrical and in particular the optical system, ie in particular the photonic components such as phase shifters 7a, 7b, 7c and beam splitters 8 for only a narrow wavelength range AA, no synchronization or easier control with only one light source 2 or a few light sources 2 and less effort when integrating only one light source 2 or a few light sources 2.
  • the electrical and optical design of the system for only one wavelength range or a few Wavelength ranges also reduce system complexity.
  • the invention provides an optical phased array 6 with an increased field of view.
  • An integrated optics has two or more antenna arrays 5a, 5b, 5c as deflection units for light beams 3a, 3b, 3c in a transmission path.
  • the antenna arrays 5a, 5b, 5c are set up to emit the tuned light beams 3a, 3b, 3c in different directions.
  • Each of the antenna arrays 5a, 5b, 5c has a fixed grating constant or grating period A n , which differs from the grating constants of the other phased arrays 5a, 5b, 5c, so that the radiation angle ... , 44 of the antenna arrays 5a, 5b, 5c for the light beams 3a, 3b, 3c emitted by you differ from one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

Est divulgué un système optique (1) qui est configuré pour balayer, au moyen d'une ou de plusieurs sources de lumière (2) par rayonnement de faisceaux lumineux (3a, 3b, 3c), une surface (4) dans un environnement utilisant le faisceau lumineux particulier (3a, 3b, 3c) afin d'obtenir à partir de ceux-ci des informations concernant l'environnement, le système optique (1) comprenant un ou plusieurs lasers en tant que sources de lumière (2). Le système optique (1) comprend une pluralité de réseaux d'antennes (5a, 5b, 5c) qui sont configurés pour recevoir la lumière rayonnée à partir d'une source de lumière attribuée (2) et pour rayonner ladite lumière, à une longueur d'onde définie à différents angles, dans l'environnement pour un balayage.
PCT/EP2022/051686 2021-02-03 2022-01-26 Système optique WO2022167274A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021200957.3 2021-02-03
DE102021200957.3A DE102021200957A1 (de) 2021-02-03 2021-02-03 Optisches System

Publications (1)

Publication Number Publication Date
WO2022167274A1 true WO2022167274A1 (fr) 2022-08-11

Family

ID=80682608

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/051686 WO2022167274A1 (fr) 2021-02-03 2022-01-26 Système optique

Country Status (2)

Country Link
DE (1) DE102021200957A1 (fr)
WO (1) WO2022167274A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9476981B2 (en) 2013-01-08 2016-10-25 Massachusetts Institute Of Technology Optical phased arrays
US20180306925A1 (en) 2017-04-25 2018-10-25 Analog Photonics LLC Wavelength division multiplexed lidar
US20190004151A1 (en) * 2017-06-29 2019-01-03 Rockley Photonics Limited Optical scanner and detector
US20190243000A1 (en) * 2018-02-02 2019-08-08 Samsung Electronics Co., Ltd. System including beam steering device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9476981B2 (en) 2013-01-08 2016-10-25 Massachusetts Institute Of Technology Optical phased arrays
US20180306925A1 (en) 2017-04-25 2018-10-25 Analog Photonics LLC Wavelength division multiplexed lidar
US20190004151A1 (en) * 2017-06-29 2019-01-03 Rockley Photonics Limited Optical scanner and detector
US20190243000A1 (en) * 2018-02-02 2019-08-08 Samsung Electronics Co., Ltd. System including beam steering device

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
C. V. POULTEN: "Long-Range LiDAR and Free-Space Data Communication With High-Performance Optical Phased Arrays", IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, vol. 25, no. 5, 2019, XP011722552, DOI: 10.1109/JSTQE.2019.2908555
F. ASHTIANI ET AL.: "N x N optical phased array with 2N phase Shifters", OPTICS EXPRESS, vol. 27, no. 19, pages 27183, XP055892930, DOI: 10.1364/OE.27.027183
J. C. HULME ET AL.: "Fully integrated hybrid silicon two dimensional beam Scanner", OPTICS EXPRESS, vol. 23, 2015, pages 5861, XP055455951, DOI: 10.1364/OE.23.005861
J. SUN ET AL.: "Large-scale nanophotonics phased array", NATURE, vol. 493, 2013, pages 195

Also Published As

Publication number Publication date
DE102021200957A1 (de) 2022-08-04

Similar Documents

Publication Publication Date Title
DE112018002172T5 (de) Gemultiplexter Wellenlängenteilungs-Lidar
DE69720577T2 (de) Millimeterwellen-Gruppenantennen mit Rotman-Linse und optischem Überlagerungssystem
DE69220716T2 (de) Optischer Strahlformer mit Zeitverzögerung für eine phasengesteuerte Gruppenantenne
DE3787941T2 (de) Elektro-optisch gesteuerte, breitbandige, phasengesteuerte Mehrfachstrahlantenne.
DE68924590T2 (de) Optischer strahlformer für eine hochfrequenz-gruppenantenne.
DE69901921T2 (de) Mehrstrahl-phasengesteuerte Antenne und damit verbundenes Verfahren
DE69902123T2 (de) Breitband-phasengesteuerte Antenne und damit verbundenes Verfahren
WO2021209514A1 (fr) Appareil et procédé de mesure de la distance par rapport à un objet par balayage
DE102014109240A1 (de) Laserradarsystem
EP0504589B1 (fr) Procédé pour la commande d'une antenne active
EP3916424A1 (fr) Dispositif et procédé de mesure par balayage de la distance à un objet
EP0992141B1 (fr) Dispositif pour transmettre des signaux optiques de frequences differentes
DE112020005597T5 (de) Array-basierte optische kommunikationsverbindungen im freien raum
DE102020208141A1 (de) Lasersende- und Empfangsmodul für Lidar
DE3872032T2 (de) Vorrichtung zur optischen steuerung einer abtastantenne.
DE112019005684T5 (de) Lidar-systeme und verfahren, bei denen ein mehrfacettenspiegel verwendet wird
WO2021249831A1 (fr) Système lidar à commande grossière d'angle
DE112021004479T5 (de) Hybrides zweidimensionales Lenkungs-LIDAR
WO2019149619A1 (fr) Réseau de pixels pour caméra, caméra et système de caméra à propagation de lumière
WO2019115782A1 (fr) Dispositif de déviation de faisceaux laser
DE102021121662A1 (de) Lichtdetektions- und Entfernungsmesssystem und optisches System
DE3889809T2 (de) Optische Schaltungsmatrix, die über eine Maske mit Öffnungen eines bestimmten Musters verfügt und Verschlüsse, die zu diesem Muster passen.
WO2022167274A1 (fr) Système optique
DE102021211063A1 (de) LiDAR-System und Verfahren zum Betreiben eines LiDAR-Systems
WO2022089936A1 (fr) Système lidar à onde continue modulée

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22708351

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22708351

Country of ref document: EP

Kind code of ref document: A1