CN113031362A - Visible light sparse array waveguide optical phased array - Google Patents
Visible light sparse array waveguide optical phased array Download PDFInfo
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- CN113031362A CN113031362A CN202110253601.3A CN202110253601A CN113031362A CN 113031362 A CN113031362 A CN 113031362A CN 202110253601 A CN202110253601 A CN 202110253601A CN 113031362 A CN113031362 A CN 113031362A
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- G—PHYSICS
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- 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
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- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
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- G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
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- 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
- G02F1/295—Analog deflection from or in an optical waveguide structure]
- G02F1/2955—Analog deflection from or in an optical waveguide structure] by controlled diffraction or phased-array beam steering
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Abstract
The invention discloses a visible light sparse array waveguide optical phased array, which comprises: an optical coupler: the optical coupling device is used for coupling the acquired optical signals; an optical beam splitter: the optical signal coupling processing module is used for carrying out optical splitting processing on the optical signal subjected to coupling processing to obtain a sub-signal; phase shift array: the optical splitter is connected with the optical signal receiver and used for adjusting and controlling the phase of the sub-signals to obtain target sub-signals; waveguide array: the optical signal, the sub-signal and the target sub-signal are transmitted after being subjected to coupling processing; sparse antenna array: and the phase shift array is connected with the target sub-signals and is used for scattering the target sub-signals to free space. The invention optimizes the array elements of the optical phased array through the sparse array, solves the grating lobe problem of the optical phased array in the visible light wave band, and realizes large-field scanning.
Description
Technical Field
The invention relates to the field of optoelectronic devices, in particular to a visible light sparse array waveguide optical phased array.
Background
Traditional commercial laser radar generally adopts mechanical rotation's mode to scan, and the system is complicated, scanning speed is slow, and weight, bulky, be unfavorable for the integration, consequently can't satisfy the miniaturized requirement of device. The liquid crystal phased array radar has low scanning speed, is not beneficial to integration and can not meet the requirement of miniaturization of devices. The optical phased array based on the micro electro mechanical system has a limited scanning angle although the scanning speed is high. The waveguide optical phased array radar has high scanning speed, can realize high integration and is the most promising all-solid-state laser radar scheme.
At present, because of the absorption characteristics of silicon materials, optical phased array radars based on silicon-on-insulator can only work at wavelengths longer than 1100nm and cannot work in visible light bands, and therefore, the applications in some visible light scenes are limited. The common waveguide optical phased array radar capable of working in a visible light wave band cannot meet the requirement that the distance between antennas is less than half of the working wavelength due to the influence of waveguide optical crosstalk, and when the distance between the antennas is increased, the grating lobe problem can occur, so that the scanning angle of the waveguide optical phased array radar is limited, and the application and the development of the waveguide optical phased array radar are limited due to the excessively small scanning angle.
Disclosure of Invention
The invention mainly aims to provide a visible light sparse array waveguide optical phased array, which optimizes the array element distribution in the waveguide optical phased array through a sparse array, expands the scanning angle of an optical phased array antenna under the condition of meeting the integration requirement of miniaturization of devices, and aims to solve the technical problem that the scanning angle of the existing waveguide optical phased array radar is too small.
The technical scheme adopted for solving the technical problems is as follows:
a visible light sparse array waveguide optical phased array, comprising:
an optical coupler: the optical coupling device is used for coupling the acquired optical signals;
an optical beam splitter: the optical signal coupling processing module is used for carrying out optical splitting processing on the optical signal subjected to coupling processing to obtain a sub-signal;
phase shift array: the optical splitter is connected with the optical signal receiver and used for adjusting and controlling the phase of the sub-signals to obtain target sub-signals;
waveguide array: the optical signal, the sub-signal and the target sub-signal are transmitted after being subjected to coupling processing;
sparse antenna array: and the phase shift array is connected with the target sub-signal and is used for transmitting the target sub-signal to free space.
Optionally, the optical splitter performs equal-intensity optical splitting on the optical signal subjected to the coupling processing to obtain equal-intensity sub-signals.
Optionally, the phase shift array comprises an electrical controller and a plurality of phase shifters, the electrical controller being connected to the plurality of phase shifters:
the electrical controller energizes the phase shifters to regulate the temperature of the phase shifter array.
Optionally, the waveguide array is comprised of waveguides, the plurality of phase shifters in the phase shift array including a first phase shifter connected to the electrical controller, the first phase shifter further connected to a first waveguide in the waveguide array:
when the electric controller energizes the first phase shifter to regulate the temperature of the first phase shifter, the first phase shifter regulates the temperature of the first waveguide through the temperature of the first phase shifter to regulate the refractive index of the first waveguide, and the first waveguide regulates the phase of the sub-signal by changing the refractive index.
Optionally, the sparse array waveguide optical phased array further comprises a light source for emitting a light signal.
Optionally, the optical coupler acquires an optical signal emitted by the light source, and performs coupling processing on the optical signal to couple the optical signal into the waveguide array of the sparse array waveguide optical phased array for transmission.
Optionally, the sparse antenna array is composed of a plurality of grating antennas, the target sub-signal is transmitted into a free space along the direction of the grating antennas to perform large-field scanning, where the grating antennas are one-dimensional gratings or two-dimensional gratings, the target sub-signal is transmitted into the free space along the direction of the grating antennas, and when the large-field scanning is performed, the scanning dimensions include a first dimension and a second dimension.
Optionally, if the grating antenna is a one-dimensional grating, the one-dimensional grating is non-uniformly arranged in the sparse antenna array, and the phase shift array adjusts the phase of the sub-signal, so that a target sub-signal corresponding to the sub-signal is transmitted into a free space along the direction of the one-dimensional grating, and large-field scanning is performed on a first dimension of the scanning dimensions.
Optionally, if the grating antenna is a one-dimensional grating, the one-dimensional grating is non-uniformly arranged in the sparse antenna array, the light source is an adjustable light source, and the adjustable light source adjusts and controls the wavelength of the sub-signal to adjust the emission direction of the target sub-signal corresponding to the sub-signal in a second dimension of the scanning dimensions, so that the target sub-signal is emitted into a free space along the direction of the one-dimensional grating to scan in the second dimension.
Optionally, if the grating antenna is a two-dimensional grating, the two-dimensional grating is non-uniformly arranged in the sparse antenna array, and the phase shift array adjusts the phase of the sub-signal, so that a target sub-signal corresponding to the sub-signal is transmitted into a free space along the direction of the two-dimensional grating, and large-field scanning is performed in a first dimension and a second dimension of the scanning dimensions.
The embodiment of the invention provides a visible light sparse array waveguide optical phased array, which comprises: an optical coupler: the optical coupling device is used for coupling the acquired optical signals; an optical beam splitter: the optical signal coupling processing module is used for carrying out optical splitting processing on the optical signal subjected to coupling processing to obtain a sub-signal; phase shift array: the optical splitter is connected with the optical signal receiver and used for adjusting and controlling the phase of the sub-signals to obtain target sub-signals; waveguide array: the optical signal, the sub-signal and the target sub-signal are transmitted after being subjected to coupling processing; sparse antenna array: and the phase shift array is connected with the target sub-signal and is used for transmitting the target sub-signal to free space. Compared with the prior art, the invention optimizes the array elements of the optical phased array through the sparse array, solves the problem of grating lobes of the waveguide optical phased array in the visible light section, improves the scanning angle of the waveguide optical phased array, and can greatly improve the view field of the waveguide optical phased array radar and realize large view field scanning on the premise of meeting the integration requirement of miniaturization of devices if the visible light sparse array waveguide optical phased array is applied to the radar.
Drawings
Fig. 1 is a schematic structural diagram of a visible light sparse array waveguide optical phased array provided in an embodiment of the present invention;
FIG. 2 is a schematic view of a scanning angle of the visible light sparse array waveguide optical phased array according to the present invention;
fig. 3 is a diagram illustrating scanning angles and resolution of a uniform antenna array according to a second embodiment of the present invention;
fig. 4 is a schematic view of the scanning angle and resolution of the sparse antenna array in the second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
At present, the existing laser radar can work under the visible light wave band, but because the scanning angle of the optical phased array in the laser radar is limited, when the laser radar works in the visible light wave band, grating lobes often appear, and the scanning angle is small. Based on the above problem, this embodiment provides a visible light sparse array waveguide optical phased array, can be applied to the lidar of work in the visible light wave band, promotes lidar's scanning visual field, especially in the application scene of visible light, can solve lidar's grating lobe problem, realizes the scanning of big visual field.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a visible light sparse array waveguide optical phased array provided in an embodiment of the present invention, specifically including:
an optical coupler S100 for performing coupling processing on the acquired optical signal; the optical splitter S200 is configured to perform optical splitting processing on the optical signal subjected to the coupling processing to obtain a sub-signal; the phase shift array S300 is connected with the optical splitter and used for regulating and controlling the phase of the sub-signal to obtain a target sub-signal; a waveguide array S400, configured to transmit the optical signal subjected to coupling processing, the sub-signal, and the target sub-signal; and the sparse antenna array S500 is connected with the phase shift array and is used for transmitting the target sub-signal to a free space.
Further, the visible light sparse array waveguide optical phased array further includes a light source for emitting a light signal, where the light source in this embodiment includes, but is not limited to, a laser, and the description is given by taking a laser as an example. The sparse array waveguide optical phased array can be applied to a laser radar, when the sparse array waveguide optical phased array is applied to the laser radar, a light signal sent by a light source can be used as a scanning signal of the laser radar after being processed by the visible light sparse array waveguide optical phased array, the scanning signal can be processed by the visible light sparse array waveguide optical phased array, the scanning angle of the laser radar can be improved, large-field-of-view scanning is achieved, and the sparse array waveguide optical phased array is used for measuring speed and distance and obtaining a three-dimensional model of an object in a free space.
In this embodiment, after the laser emits a laser signal, the optical coupler S100 acquires the laser signal emitted by the laser and couples the laser signal into the waveguide array S400 to transmit the laser signal.
The waveguide array S400 is, for example, a commonly-used silicon nitride waveguide, and after a laser signal is coupled into the silicon nitride waveguide, the laser signal is split by the optical splitter S200 to obtain sub-signals, where the optical splitter S400 splits the laser signal with equal intensity when splitting the laser signal, and the obtained sub-signals include a plurality of laser signals with equal intensity.
The sub-signals after the optical splitting process are transmitted to the phase shift array S300 in the waveguide, and the phase shift array S300 includes a plurality of phase shifters for adjusting and controlling the phases of a plurality of laser signals in the sub-signals after the optical splitting process to obtain target sub-signals. For example, if a plurality of laser signals subjected to the spectroscopic processing are parallel signals, the laser signals in the target sub-signals and the optical signals emitted by the light source are not necessarily parallel signals through the phase adjustment of the phase shifter after passing through the phase shift array.
Specifically, the phase shift array S300 includes a plurality of electric controllers connected to the phase shifters, and when only one electric controller is provided, the plurality of phase shifters may be simultaneously controlled to be powered on through a plurality of parallel circuits. When the phase shifter in the phase shift array S300 needs to adjust the phase of the laser signal, the electric controller is used to energize the phase shifter in the phase shift array S300, and the phase shifter raises the temperature thereof by the heat generated by energization, wherein the device generating heat when energizing the phase shifter may be a thermal resistor or a micro-heater, which is not limited specifically herein. The phase shifter in the phase shift array S300 is connected to the waveguide in the waveguide array, wherein a preferred connection manner is, as shown in fig. 1, that the waveguide array and the phase shift array are connected in an overlapping manner, the waveguide array is below, the phase shift array is above the waveguide array, when the temperature of the phase shifter rises, the temperature of the waveguide is regulated and controlled through heat transfer or heat radiation, and when the temperature of the waveguide changes, the refractive index of the waveguide changes accordingly to the optical signal, so that the emission direction of the laser signal transmitted in the waveguide is changed, and the phase regulation of the laser signal transmitted in the waveguide is realized.
Further, when the phase shifter is electrically heated, the electrical signal (including but not limited to a voltage signal and a current signal) generated by the electrical controller can control the time length of the phase shifter, or the voltage or the current when the phase shift array is electrically powered, so as to control the temperature of the phase shifter, and further control the refractive index of the waveguide. The energization time period is controlled, including but not limited to, by the pulse width of the pulse signal.
When the phase shift array S300 adjusts and controls the phase of the sub-signal to obtain the target sub-signal, the obtained target sub-signal is transmitted to the sparse antenna array S500 and is transmitted by the sparse antenna array S500. The sparse antenna array S500 is a sparse array formed by a plurality of grating antennas, and is configured to transmit a target sub-signal obtained through phase adjustment to a free space, where the grating antennas may be gratings or two-dimensional gratings, and are not limited herein. Many grating antennas are non-uniformly distributed in the sparse array, compare in even array, on the one hand, under the same condition of grating antenna quantity, the distribution distance between the grating antenna of sparse array is greater than the distance between the grating antenna in even array, can promote antenna resolution ratio. On the other hand, under the condition that the array layout area is the same, the number of the grating antennas in the sparse array is less than that of the uniform array, that is, the array element distribution can be optimized by reducing the number of the grating antennas in the uniform array, and the cost is reduced while the grating lobe problem is solved.
Specifically, the sparse antenna array S500 is configured to emit a target sub-signal into a free space, where a laser device emits a laser signal to be processed, an optical coupler receives the laser signal emitted by the laser device, couples the laser signal into a silicon nitride waveguide, and transmits the laser signal into an optical beam splitter, and the optical beam splitter performs optical splitting processing to split the laser signal emitted by the laser device into a plurality of laser signals with equal intensity, and splits the laser signals into corresponding optical paths in the waveguide to transmit the laser signals to a phase shift array, where the phase shifter in the phase shift array adjusts and controls the phase of the laser signals with equal intensity in the sub-signals to obtain the target sub-signal, and the sparse antenna array emits the target sub-signal into the free space. The target sub-signals transmitted into the free space can change the transmission direction in two dimensions, large field-of-view scanning in two dimensions is realized, and when the target sub-signals are transmitted into the free space, if the target sub-signals meet an obstacle, a scanning light spot is formed on the obstacle.
Further, the target sub-signal forming the scanning spot in the free space is not fixed relative to the direction of the laser signal emitted by the laser, as shown in fig. 2, which is a schematic view of the scanning angle of the laser signal, in fig. 2, the grating antenna in the sparse array waveguide optical phased array is a one-dimensional grating, the X-axis direction is the propagation direction of the laser signal in the grating antenna waveguide, the direction perpendicular to the X-axis in the plane where the waveguide array is defined is the Y-axis direction, the ray passing through the point O and perpendicular to the planes where the X-axis and the Y-axis are located is the direction in which the grating antenna emits, and the angles ψ and θ correspond to one scanning angle of the target sub-signal emitted to the free space in two scanning dimensions, respectively. Specifically, the scanning dimension and the scanning angle shown in fig. 2 may be different according to the specific connection manner of each component in the visible light sparse array waveguide optical phased array and the difference of the grating antenna, but are included in the scope of the present invention.
In this embodiment, a visible light sparse array waveguide optical phased array is disclosed, including: an optical coupler: the optical coupling device is used for coupling the acquired optical signals; an optical beam splitter: the optical signal coupling processing module is used for carrying out optical splitting processing on the optical signal subjected to coupling processing to obtain a sub-signal; phase shift array: the optical splitter is connected with the optical signal receiver and used for adjusting and controlling the phase of the sub-signals to obtain target sub-signals; waveguide array: for transmitting the optical signal, the sub-signal and the target sub-signal; sparse antenna array: and the phase shift array is connected with the target sub-signal and is used for transmitting the target sub-signal to free space. Through the array element of sparse array optimization optics phased array, the grating lobe problem of waveguide optics phased array has been solved to improve waveguide optics phased array's scanning angle, if will the radar is applied to the sparse array waveguide optics phased array of visible light, under the prerequisite that satisfies the miniaturized integrated demand of device, can promote waveguide optics phased array radar's scanning visual field greatly, realize the scanning of big visual field.
Further, on the basis of the above embodiment, another implementation of the visible light sparse array waveguide optical phased array of the present invention is proposed, and this embodiment is a refinement of the sparse antenna array S500 in the above embodiment, specifically:
the sparse antenna array S500 is composed of a plurality of grating antennas, each grating antenna is an antenna unit, in the sparse antenna array S500, the antenna units are non-uniformly arranged, and the antenna units may be one-dimensional gratings or two-dimensional gratings. When the sparse array waveguide optical phased array is applied to a laser radar, taking the laser signal, the sub-signal and the target sub-signal in the above embodiments as examples, when the antenna unit is a one-dimensional grating or a two-dimensional grating, the target sub-signal can be transmitted to a free space along the direction of the grating antenna, so that large field scanning of the laser radar on two dimensions is realized, functions of distance measurement, speed measurement and the like are realized, and a three-dimensional model of an object can be constructed.
Specifically, when the antenna unit is a one-dimensional grating, if large field scanning in two dimensions is to be achieved, the emission directions of the target sub-signals in the two dimensions need to be adjusted, where one scanning dimension adjusts the emission direction of the target sub-signals by adjusting the wavelength thereof, and the other dimension directly adjusts the emission direction thereof by adjusting the phase. Specifically, when wavelength regulation is utilized, a light source in the visible light sparse array waveguide optical phased array is an adjustable light source, the wavelength of a laser signal to be processed is changed by utilizing the adjustable light source, so that the wavelength of a target sub-signal is changed, when the wavelength of the target sub-signal is changed, the emission direction of the target sub-signal is changed, and large-field scanning can be performed on one of two scanning dimensions of the laser radar. In another scanning dimension of the laser radar, the emission direction of the target sub-signal is changed by utilizing phase adjustment, namely the phase of the sub-signal obtained by the optical beam splitter is regulated and controlled by the phase shift array and the waveguide array to obtain the target sub-signal, so that the emission direction of the target sub-signal to a free space along the grating antenna is changed, and the large-field scanning of the laser radar in the other dimension is realized. When the antenna unit is a two-dimensional grating, when a target sub-signal is transmitted to a free space along the direction of the grating antenna, two transmitting dimensions exist, and the phases of laser signals on the two dimensions of the two-dimensional grating antenna can be regulated and controlled through the phase shift array and the waveguide array, so that large-field scanning of the laser radar on the two dimensions is realized.
Taking a one-dimensional grating as an example, when the grating antenna in the sparse array antenna array S500 is a one-dimensional grating, the angular scanning of the target sub-signal in two dimensions is realized by adjusting the wavelength and the phase of the target sub-signal transmitted to the free space by the visible light sparse array waveguide optical phased array. On one hand, the transmitting direction of the optical signal finally transmitted to the free space by the visible light sparse array waveguide optical phased array is adjusted by adjusting the wavelength of the optical signal, wherein the light source in the visible light sparse array waveguide optical phased array is an adjustable light source, the wavelength of the optical signal transmitted by the adjustable light source is adjustable, in the sparse antenna array S500, antenna units formed by one-dimensional gratings are non-uniformly arranged, and the change of the wavelength enables a target sub-signal to be transmitted into the free space along the direction of the one-dimensional grating. When the one-dimensional grating transmits a target sub-signal into a free space, the wavelength adjusting process comprises the following steps: the wavelength of the emitted laser signal is changed through the adjustable light source, so that the wavelength of the sub-signal is changed, the emission direction of the target sub-signal corresponding to the sub-signal is changed through changing the wavelength of the sub-signal, and the scanning angle of the waveguide optical phased array on one scanning dimension is further changed.
On the other hand, the phase of the optical signal is adjusted through the phase shift array, so that the transmitting direction of the optical signal finally transmitted to the free space by the visible light sparse array waveguide optical phased array is adjusted, and the specific process is as follows:
for a uniform array waveguide optical phased array formed by uniformly distributed one-dimensional gratings, the scanning azimuth angle of an optical signal along the direction of a grating antenna in an antenna array is shown as the following formula (formula 1):
wherein d is the distance between grating antennas, lambda is the wavelength of the laser signal, and phi is the phase difference between the grating antennas;
therefore, the scanning field angle FOV can be obtained as (equation 2):
FOV＝sin-1(λ/d) (2)
due to the influence of optical crosstalk between waveguides, the distance between antennas cannot meet less than half of the wavelength of a laser signal, so that grating lobes occur, and the field angle of the uniform array waveguide optical phased array antenna is calculated to be 20.7 ° with λ being 532nm and d being 1.5um as examples.
The sparse array can remove a part of antenna units from the antenna array under the condition of not changing the distance of the antenna array, so that the distribution of array elements is optimized, grating lobes are eliminated, and the field angle of the waveguide optical phased array antenna is improved. Meanwhile, after a part of electric wire units are removed, the average spacing of the antenna units in the sparse array is larger than that of the uniform array, and under the condition of the same array element, the overall aperture of the sparse array antenna is increased, so that the resolution of the antenna can be improved.
Taking the same number of antenna units as an example, 64 antenna units are provided, the same laser signal has a wavelength of 500nm, the pitch of the antenna units in the uniform array is 1.5um, the average pitch of the antenna units in the sparse array is 5.5um, as shown in fig. 3 and fig. 4, the scanning angle is schematically illustrated in fig. 3 for the optical phased array of the uniform array, fig. 4 is schematically illustrated in the scanning angle of the optical phased array of the sparse array, in fig. 3 and fig. 4, the left diagram is a schematic view angle, the right diagram is a schematic view resolution, in fig. 3, the viewing angle of the uniform array antenna is about 20 °, the resolution is about 0.26 °, and in fig. 4, the viewing angle of the sparse array antenna is close to 180 °, and the resolution is about 0.074 °.
In this embodiment, in the visible light sparse array waveguide optical phased array, the grating antennas forming the sparse antenna array may be one-dimensional gratings or two-dimensional gratings, and on the basis of a uniform array, the array element optimization is realized by reducing the antenna units and increasing the average spacing between the antenna units, so as to improve the resolution of the antenna units in the sparse antenna array; or under the condition that the number of the antenna units is the same, the average distance between the antenna units is increased, so that the overall aperture of the sparse antenna array is increased, the resolution of the antenna units in the sparse antenna array is improved, and the scanning angle of the waveguide optical phased array is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity/action/object from another entity/action/object without necessarily requiring or implying any actual such relationship or order between such entities/actions/objects; the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A visible light sparse array waveguide optical phased array, comprising:
an optical coupler: the optical coupling device is used for coupling the acquired optical signals;
an optical beam splitter: the optical signal coupling processing module is used for carrying out optical splitting processing on the optical signal subjected to coupling processing to obtain a sub-signal;
phase shift array: the optical splitter is connected with the optical signal receiver and used for adjusting and controlling the phase of the sub-signals to obtain target sub-signals;
waveguide array: the optical signal, the sub-signal and the target sub-signal are transmitted after being subjected to coupling processing;
sparse antenna array: and the phase shift array is connected with the target sub-signal and is used for transmitting the target sub-signal to free space.
2. The visible light sparse array waveguide optical phased array as claimed in claim 1, wherein the optical beam splitter performs equal-intensity optical splitting processing on the optical signal subjected to the coupling processing to obtain equal-intensity sub-signals.
3. The visible light sparse array waveguide optical phased array of claim 1, wherein the phase shift array comprises an electrical controller and a plurality of phase shifters, the electrical controller connected to the plurality of phase shifters:
the electrical controller energizes the phase shifters to regulate the temperature of the phase shifter array.
4. The visible light sparse array waveguide optical phased array of claim 3, wherein the waveguide array is comprised of waveguides, the plurality of phase shifters in the phase shift array comprising a first phase shifter connected to the electrical controller, the first phase shifter further connected to a first waveguide in the waveguide array:
when the electric controller energizes the first phase shifter to regulate the temperature of the first phase shifter, the first phase shifter regulates the temperature of the first waveguide through the temperature of the first phase shifter to regulate the refractive index of the first waveguide, and the first waveguide regulates the phase of the sub-signal by changing the refractive index.
5. The visible light sparse array waveguide optical phased array of claim 1, further comprising a light source for emitting a light signal.
6. The visible light sparse array waveguide optical phased array of claim 5, wherein the optical coupler acquires an optical signal emitted by the light source and couples the optical signal for transmission into a waveguide array of the sparse array waveguide optical phased array.
7. The visible light sparse array waveguide optical phased array of claim 1, wherein the sparse antenna array is composed of a plurality of grating antennas, the target sub-signal is emitted into free space along the direction of the grating antennas, and a large field of view scanning is performed, wherein the grating antennas are one-dimensional gratings or two-dimensional gratings, the target sub-signal is emitted into free space along the direction of the grating antennas, and when the large field of view scanning is performed, the scanning dimension comprises a first dimension and a second dimension.
8. The visible light sparse array waveguide optical phased array of claim 7, wherein if the grating antenna is a one-dimensional grating, the one-dimensional grating is non-uniformly arranged in the sparse antenna array, and the phase shift array adjusts the phase of the sub-signal, so that a target sub-signal corresponding to the sub-signal is emitted into free space along the one-dimensional grating direction, and a large field of view scan is performed in a first one of the scan dimensions.
9. The visible light sparse array waveguide optical phased array of any one of claims 5 to 8, wherein if the grating antenna is a one-dimensional grating, the one-dimensional grating is non-uniformly arranged in the sparse antenna array, the light source is an adjustable light source, and the adjustable light source adjusts and controls a wavelength of the sub-signal to adjust an emission direction of a target sub-signal corresponding to the sub-signal, so that the target sub-signal is emitted into a free space along the direction of the one-dimensional grating, and is scanned in a second dimension of the scanning dimensions.
10. The visible light sparse array waveguide optical phased array of claim 7, wherein if the grating antenna is a two-dimensional grating, the two-dimensional grating is non-uniformly arranged in the sparse antenna array, and the phase shift array adjusts the phase of the sub-signal, so that a target sub-signal corresponding to the sub-signal is emitted into free space along the two-dimensional grating direction, and a large field of view scan is performed in a first dimension and a second dimension of the scan dimension.
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| CN110737144A (en) * | 2019-09-17 | 2020-01-31 | 浙江大学 | Integrated optical phased array of sparse/half-wave arrangement two-dimensional antennas |
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| CN111580070A (en) * | 2020-05-28 | 2020-08-25 | 香港中文大学（深圳） | Optical phased array laser radar |
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| US20180123699A1 (en) * | 2016-06-07 | 2018-05-03 | California Institute Of Technology | Optical sparse phased array receiver |
| CN111367012A (en) * | 2018-12-26 | 2020-07-03 | 北京大学 | Optical phased array based on grating unit and optical scanning method |
| CN110737144A (en) * | 2019-09-17 | 2020-01-31 | 浙江大学 | Integrated optical phased array of sparse/half-wave arrangement two-dimensional antennas |
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