CN116413859A - Optical phased array system and control method thereof - Google Patents
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Abstract
The application provides an optical phased array system and a control method thereof, wherein the optical phased array system comprises: an input waveguide; a beam splitter; an output waveguide array that transmits the plurality of light beams output by the beam splitter, the output waveguide array including a plurality of output waveguides; a phase shifter array including a plurality of phase shifters, each phase shifter being disposed in correspondence with at least one output waveguide for adjusting a phase of a light beam propagating through the at least one output waveguide; a light emitting antenna array including a plurality of light emitting antennas, each of which is provided corresponding to each of the output waveguides, for receiving and emitting light outputted from the output waveguides; at least one first optical coupler, each first optical coupler coupled to at least two optical transmit antennas; at least one photodetector that detects at least the light output from each of the first optical couplers; and a controller for controlling a phase shift process of at least one of the phase shifters according to a detection result of the photodetector.
Description
Technical Field
The application relates to the technical field of optical phased arrays, in particular to an optical phased array system and a control method thereof.
Background
The optical phased array realizes non-mechanical scanning of the light beam through the arrangement of the transmitting antennas and the independent control of the phase of the light beam. An optical phased array is an optical antenna array for integrated photonics three-dimensional sensing, similar to a radar phased array.
Fig. 1 is a schematic of a one-dimensional optical phased array (Optical Phased Array, OPA). As shown in fig. 1, the optical phased array 1 includes: an input waveguide 10, a beam splitter (splitter) 20, a phase shifter (phase shifter) array 30 and a leaky-wave antenna array (leaky wave antenna array) 40. The beam splitter 20 splits the light input from the input waveguide 10 into N0 light beams and outputs the N0 light beams from the N0 output waveguides, and the beam splitter 20 may be, for example, a multimode interferometer (MMI), an MMI tree, a star coupler, a directional coupler tree, or the like. The phase shifter array 30 may include a plurality of phase shifters, each of which may be disposed corresponding to an output waveguide so as to change the phase of light in the output waveguide. Each antenna in leaky-wave antenna array 40 may be coupled to 1 output waveguide for phase-shifted optical output. Each antenna may have, for example, a grating-like diffraction structure.
The light waves output by the optical phased array 1 form a beam in the far field (far field), as shown in fig. 2.
The angle of the beam may be modified when the successive phase differences between the antennas change. However, the phase of the light ending at each antenna is random due to the sidewall roughness of the waveguide and the thickness and width variations of the waveguide. This randomization of the phase pattern in leaky wave antenna array 40 becomes more severe as the number of antennas increases and the propagation length (propagation length) increases. If the phase is not calibrated, the above effects can produce a larger beam in the far field, reducing the detection resolution and even making detection impossible. If calibration (calibration) and phase equalization (equalization) are performed for each antenna using a phase shifter before each antenna, the diameter of the beam can be effectively reduced, thereby improving the detection resolution. Fig. 3 is a schematic diagram of the far field projection of the pre-and post-collimated beams.
The most common calibration method is to image the far field by microscopy and control the phase shifter using complex algorithms to achieve the calibration.
It should be noted that the foregoing description of the background art is only for the purpose of facilitating a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background section of the present application.
Disclosure of Invention
The inventors of the present application found that: OPA may lose calibration due to environmental changes (e.g., temperature changes, etc.) when used in the automotive industry, etc.; in addition, the response of the phase shifter may also change during operation, losing initial calibration and disabling the OPA system; furthermore, beam steering requires precise information of the phase response of each antenna, which can only be retrieved by strict phase mapping and characterization of the beam shape of each antenna, and thus, calibration of a large number of antennas is difficult to perform quickly. The above factors cause that the existing calibration method is difficult to obtain stable calibration, and the calibration efficiency is low due to the complexity of the calibration algorithm, so that the yield per unit time is low when the OPA system is produced in mass. Thus, industrialization of OPA systems requires an OPA system that has higher calibration efficiency and that can obtain calibration more stably.
The embodiment of the application provides an optical phased array system and a control method thereof, in the optical phased array system, light in a transmitting antenna is coupled, the coupled light is detected, and a phase shifter in the optical phased array is controlled to carry out phase shifting according to a detection result, so that the efficiency of phase calibration can be improved, and stable calibration can be obtained.
According to an aspect of embodiments of the present application, there is provided an optical phased array system including:
an input waveguide (input waveguide) for transmitting light;
a beam splitter (splitter) that splits the light transmitted by the input waveguide into a plurality of light beams;
an output waveguide array that transmits the plurality of light beams output by the beam splitter, the output waveguide array including a plurality of output waveguides;
a phase shifter array comprising a plurality of phase shifters, each phase shifter being disposed in correspondence with at least one output waveguide for adjusting a phase of a light beam propagating through the at least one output waveguide;
a light emitting antenna array including a plurality of light emitting antennas, each light emitting antenna being provided corresponding to each output waveguide for receiving and emitting light output from the output waveguide;
at least one first optical coupler, each first optical coupler coupled to at least two optical transmit antennas;
at least one photodetector that detects at least the light output from each of the first optical couplers; and
and a controller for controlling a phase shift process of at least one of the phase shifters according to a detection result of the photodetector.
According to another aspect of embodiments of the present application, each of the first optical couplers is coupled to an end of the at least two light transmitting antennas.
According to another aspect of embodiments of the present application, the optical phased array system further includes:
at least one of the second optical couplers is provided,
the second optical coupler couples the light output by at least two first optical couplers, or the second optical coupler couples the light output by at least two second optical couplers of the previous stage,
the at least one photodetector also detects light output by each of the second optocouplers.
According to another aspect of an embodiment of the present application, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector reaches a predetermined value.
According to another aspect of an embodiment of the present application, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector detecting the output light of the first optical coupler reaches the predetermined value,
then, the detection result of the output light of the second optical coupler for the preceding stage is made to reach the predetermined value.
According to another aspect of an embodiment of the present application, wherein,
the controller controls at least one of the phase shifters according to a detection result of the photodetector so that a phase between the light emitting antennas is changed or kept unchanged.
According to another aspect of the embodiments of the present application, there is provided a control method for controlling the optical phased array system described in any one of the above aspects, the control method including:
the controller controls the phase shift process of at least one of the phase shifters according to the detection result of the photodetector.
The beneficial effects of this application lie in: in the optical phased array system, light in a transmitting antenna is coupled, the coupled light is detected, and a phase shifter in the optical phased array is controlled to perform phase shifting according to a detection result, so that the efficiency of phase calibration can be improved, and stable calibration can be obtained.
Specific embodiments of the present application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the present application may be employed. It should be understood that the embodiments of the present application are not limited in scope thereby. The embodiments of the present application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a one-dimensional optical phased array;
FIG. 2 is a schematic diagram of the optical wave output by the optical phased array forming a beam in the far field;
FIG. 3 is a schematic diagram of the far field projection of the pre-and post-collimated beams;
fig. 4 is a schematic diagram of an optical phased array system of embodiment 1 of the application.
Detailed Description
The foregoing and other features of the present application will become apparent from the following description, with reference to the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the present application which are indicative of some of the embodiments in which the principles of the present application may be employed, it being understood that the present application is not limited to the described embodiments, but, on the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the appended claims.
Example 1
Fig. 4 is a schematic diagram of the optical phased array system of embodiment 1.
As shown in fig. 4, the optical phased array system 400 includes: an input waveguide (41), a beam splitter (42), an output waveguide array (43), a phase shifter array (44), an optical transmit antenna array (45), at least one first optical coupler (46), at least one optical detector (47), and a controller (48).
The input waveguide 41 is used for transmitting light.
The beam splitter 42 splits the light transmitted by the input waveguide 41 into a plurality of light beams, for example, N light beams, N being a natural number of 2 or more, and the beam splitter 42 may be, for example, a multimode interferometer (MMI), an MMI tree, a star coupler, a directional coupler tree, or the like.
The output waveguide array 43 transmits the plurality of light beams output by the beam splitter 42, wherein the output waveguide array 43 may include a plurality of output waveguides 431, e.g., N output waveguides 431, each output waveguide 431 may be coupled to one output of the beam splitter 42 to receive and transmit the light beams output from the beam splitter 42.
The phase shifter array 44 may include a plurality of phase shifters 441, e.g., M phase shifters, M being a natural number.
Each of the phase shifters 441 is disposed corresponding to at least one of the output waveguides 431, and is configured to adjust a phase of a light beam propagating through the at least one output waveguide 431, that is, perform a phase shifting process, for example, the phase shifters 441 are equal to the output waveguides 431, and one of the phase shifters 441 is disposed corresponding to one of the output waveguides 431, so that each of the phase shifters 441 can individually control a phase of the light beam in one of the output waveguides 431; further, the present application may not be limited thereto, and for example, one phase shifter 441 may correspond to 2 or more output waveguides 431, thereby adjusting the phases of the light beams in the 2 or more output waveguides 431.
The phase shifter 441 may have a p-n diode structure, a p-i-n diode structure, a heater structure, or the like, and thus the phase of the light beam can be adjusted by a carrier effect, a thermal effect, or the like.
The light emitting antenna array 45 includes a plurality of light emitting antennas 451, each light emitting antenna 451 being provided corresponding to each output waveguide 431 for receiving and emitting light output from the output waveguide 431. The light emitting antenna 451 may have a grating-like emitting structure, whereby light can be radiated to an external space through the grating-like emitting structure.
The light emitting antennas 451 and the output waveguides 431 have a one-to-one correspondence, and the output waveguides 431 and the phase shifters 441 have a correspondence, and therefore, the light emitting antennas 451 and the phase shifters 441 have a correspondence.
Each of the first optical couplers 46 may be coupled with at least two light emitting antennas 451, respectively, to couple non-emitted light of the at least two light emitting antennas 451 and output the coupled light. For example, the input end of each first optical coupler 46 is coupled to the ends of at least two light emitting antennas 451, so that the respective lights of the at least two light emitting antennas 451 can be received.
The first optical coupler 46 may be, for example, a directional coupler (Directional Coupler) or a multimode interferometer (Multimode Interferometer), or the like.
Each photodetector 47 can detect at least the light (i.e., the coupled light) output from each first optical coupler 46, and for example, the photodetector 47 may be an element such as a photodiode, whereby an electrical signal corresponding to the light output from the first optical coupler 46 can be obtained.
The controller 48 controls the phase shift process of the at least one phase shifter 441 based on the detection result of the photodetector 47.
In this embodiment, the phase difference of the light beams of the at least two light emitting antennas 451 at the input end of the first optical coupler 46 affects the intensity of the coupled light at the output end of the first optical coupler 46, thereby affecting the detection result of the optical detector 47, so the controller 48 can determine the phase difference of the light beams of the at least two light emitting antennas 451 at the input end of the first optical coupler 46 according to the detection result of the optical detector 47, thereby controlling the phase shift process of the phase shifters 441 corresponding to the at least two light emitting antennas 451 according to the phase difference, and thus, feedback control can be formed such that the phase shifters perform stable phase shift process, and the phase of the light beams in the corresponding output waveguides 431 remain stable. Thus, stable phase calibration of each antenna can be realized, and the efficiency of phase calibration can be improved, thereby improving the yield per unit time when the optical phased array system is produced in mass.
For example, when it is determined that there is a phase difference, the phase shift process of the phase shifters 441 corresponding to the at least two optical transmit antennas 451 may be adjusted so that the phase difference gradually decreases to the minimum, thereby achieving phase alignment of the at least two optical transmit antennas 451 at the input end of the first optical coupler 46. In a specific example, during a phase calibration (calibration) operation of the optical phased array system 400, the controller 48 may control the at least one phase shifter 441 such that the detection result of the optical detector reaches a predetermined value, for example, a value corresponding to the-3 dB point of the maximum value of the detection result obtained by the optical detector, to thereby achieve phase calibration of the at least two optical transmitting antennas 451.
In this embodiment, the optical phased array system 400 may further include: at least one second optocoupler 49. The second optical coupler 49 may couple light output from at least two first optical couplers 46, or the second optical coupler 49 may couple light output from at least two second optical couplers 49 of a previous stage. Wherein the at least one light detector 47 also detects the light output by each second optocoupler.
By providing the second optical coupler 49, phase calibration and phase control of the antenna can be performed stepwise. For example, by providing the first optical coupler 46, phase calibration and feedback control of the phase within a group (intra-group) can be achieved within a group of antennas (i.e., at least two antennas) corresponding to the first optical coupler 46; further, by providing the second optical coupler 49, the light output from the at least two first optical couplers 46 can be received, and thus phase calibration and feedback control of the phase across groups (inter-groups) can be realized for at least two groups of antennas corresponding to the at least two first optical couplers 46; further, the light outputted from each of the at least two second optical couplers 49 of the previous stage may be further inputted in common to the second optical couplers 49 of the next stage, thereby achieving phase calibration and feedback control of the phase across groups (inter-groups) in a wider range of the antenna.
In the present embodiment, in the case where the optical phased array system 400 has the first optical coupler 46 and the second optical coupler 49, during the phase calibration operation, the controller 48 controls the at least one phase shifter 441 such that the detection result of the photodetector 47 that detects the output light of the first optical coupler 46 reaches a predetermined value (for example, a value corresponding to the-3 dB point of the maximum value of the detection result); then, optionally, the phase shifter 441 is controlled so that the detection result for the light output from the second optical coupler 49 connected to the first optical coupler 46 reaches a predetermined value (for example, a value corresponding to the-3 dB point of the maximum value of the detection result); then, optionally, the phase shifter 441 is controlled so that the light detection result output by the second optical coupler 49 of the next stage reaches a predetermined value (for example, a value corresponding to the-3 dB point of the maximum value of the detection result); then, optionally, by analogy, phase calibration is performed step by step, thereby achieving phase calibration for all the light emitting antennas 451.
In addition, during the calibration of the next stage, whether the calibration result of the previous stage is offset or lost can be tracked, so that the stability of phase calibration is ensured.
In the present embodiment, in the case where the phase calibration of the light emitting antennas 451 is achieved, the controller 48 may control at least one phase shifter 441 according to the detection result of the photodetector 47 so that the phase between the light emitting antennas 451 is changed. For example, the controller 48 may control the phase shifter 441 according to the detection result of the photodetector 47 so that the phase between the adjacent light emitting antennas 451 is changed, thereby changing parameters such as the angle of the light emitted from the light emitting antenna array 45, and thereby enabling the light wave to be turned to a desired angle.
In addition, during operation of the optical phased array system 400, the controller 48 may control the at least one phase shifter 441 according to the detection result of the photodetector 47, so that the phase between the light emitting antennas 451 remains unchanged, thereby maintaining the light beam emitted from the optical phased array system 400 with stable quality.
Further, in the present application, an input waveguide (41), a beam splitter (42), an output waveguide array 43, a phase shifter array 44, an optical transmitting antenna array 45, at least one first optical coupler 46, at least one optical detector 47, and at least one second optical coupler 49 may be provided on the same chip, or on the same substrate.
The principle of operation of the optical phased array system 400 is illustrated below in connection with fig. 4.
In fig. 4, the first optocoupler 46 and the second optocoupler 49 are both optocouplers having two inputs and two outputs. It should be noted that fig. 4 is only an example, and the first optical coupler 46 and the second optical coupler 49 may be optical couplers having three or more input ends and three or more output ends, and the optical phased array system having such optical couplers operates in a similar manner to that shown in fig. 4.
In fig. 4, each two light emitting antennas 451 are coupled to two input ends of the first optical coupler 46, respectively, as a group. The number of the light emitting antennas 451 is L, and when L is an even number, the number of the first optical couplers 46 may be L/2, for example, L is equal to 8 in fig. 4, and the number of the first optical couplers 46 is 4; when L is an odd number, the number of the first optical couplers 46 may be (L-1)/2, and the remaining one light emitting antenna 451 may be input to one end of the second optical coupler 49 or left empty. Thus, each of the first optical couplers 46 can couple light of the two light emitting antennas 451.
The plurality of first optocouplers 46 may constitute a first stage optocoupler unit.
One output end of each first optical coupler 46 is opposed to or coupled with one photodetector 47, whereby the photodetector 47 can detect the coupled light output from the first optical coupler 46.
The other output end of each first optical coupler 46 is coupled to or opposed to or connected to the input end of the second optical coupler 49, whereby the light output from the two first optical couplers 46 can be input to one second optical coupler 49, and each second optical coupler 49 can couple the light output from the two first optical couplers 46.
The number of second photo-couplers 49 receiving the light output from the first photo-coupler 46 may be L/4 or (L-1)/4, for example, 2.
The plurality of second photo-couplers 49 receiving the light output from the first photo-coupler 46 may be referred to as second-stage photo-coupler units.
In the 2 nd stage optocoupler unit, one output end of each second optocoupler 47 is opposed to or coupled with one photodetector 47, whereby the photodetector 47 can detect the coupled light output from the second optocoupler 47.
In the 2 nd stage optocoupler unit, the other output end of each second optocoupler 47 is coupled to or opposed to or connected to the input end of the second optocoupler 49 of the next stage, whereby the light output from the two second optocouplers 49 of the 2 nd stage optocoupler unit can be input to one second optocoupler 49 of the next stage. The number of the next stage second optical couplers 49 may be L/8 or (L-1)/8, for example, 1. This next stage second optocoupler 49 may be referred to as a 3 rd stage optocoupler unit.
In the present embodiment, for the nth stage optocoupler unit, the number of optocouplers (e.g., the first optocoupler 46 or the second optocoupler 49) included therein may be expressed as L/2 n 。
As shown in fig. 4, in this embodiment, at each stage of the optocoupler unit, the optocouplers (e.g., the first optocoupler 46 or the second optocoupler 49) may couple the light from the input ends together to produce coupled light, which is, for example, coupled light
Modulated light, wherein->
And->
Is the phase of the light at the input of the optocoupler. When the two phases are equal (i.e., +.>
) The optical signal detected by the optical detector 47 at one output of the optical coupler may reach the modulated-3 dB point (reach-3 dB point of the modulation).
As shown in fig. 4, the phase calibration of the antennas may start from the stage 1 optocoupler unit, and the controller 48 may pattern the output signals of the photodetectors 47 corresponding to the stage 1 optocoupler unit, adjust the corresponding phase shifters 441 so that the phases of the two antennas inputting light beams to the same optocoupler are equal. After the calibration based on the previous stage of the optocoupler unit is completed, the calibration may be further performed according to the next stage of the optocoupler unit, that is, the calibration is performed with two groups of antennas as one unit, so as to expand the range of the calibrated antennas.
During the calibration based on the next-stage optocoupler unit, the operation of the calibration based on the previous-stage optocoupler unit may also be repeated, thereby maintaining the effect of the calibration even though the response of each phase shifter may be different or nonlinear.
After the phase calibration of the antennas is completed, the phase between the antennas (e.g., adjacent antennas) may be adjusted by tracking the signal of each photodetector 47, thereby adjusting the beam of the light wave emitted by the light emitting antenna array 45 to a desired angle.
During operation of the optical phased array system 400, a feedback loop formed by the optical couplers (46, 49), the optical detector 47, and the controller 48 may be used to maintain stable beam quality of the optical waves emitted by the optical transmit antenna array 45.
According to embodiment 1 of the present application, in the optical phased array system 40, light in the transmitting antenna is coupled, and the coupled light is detected, and the phase shifter in the optical phased array is controlled to perform the phase shifting process according to the detection result, whereby the efficiency of phase calibration can be improved and stable calibration can be obtained.
A controller described in connection with an embodiment of the present invention may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. These hardware modules may be implemented, for example, by solidifying the software modules using a Field Programmable Gate Array (FPGA).
A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium; or the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The software modules may be stored in the memory of the mobile terminal or in a memory card that is insertable into the mobile terminal. For example, if the electronic device employs a MEGA-SIM card of a large capacity or a flash memory device of a large capacity, the software module may be stored in the MEGA-SIM card or the flash memory device of a large capacity.
The controller described for this embodiment may be implemented as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof for use in performing the functions described herein. May also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP communication, or any other such configuration.
The embodiment of the invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory and the like for storing the above program.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, may be executed after, or may even be executed simultaneously, so long as the implementation of the present solution is possible, all should be considered as falling within the protection scope of the present application.
The present application has been described in connection with specific embodiments, but it should be apparent to those skilled in the art that these descriptions are intended to be illustrative and not limiting. Various modifications and alterations of this application may occur to those skilled in the art in light of the spirit and principles of this application, and are to be seen as within the scope of this application.
Claims (10)
1. An optical phased array system comprising:
an input waveguide (input waveguide) for transmitting light;
a beam splitter (splitter) that splits the light transmitted by the input waveguide into a plurality of light beams;
an output waveguide array that transmits the plurality of light beams output by the beam splitter, the output waveguide array including a plurality of output waveguides;
a phase shifter array comprising a plurality of phase shifters, each phase shifter being disposed in correspondence with at least one output waveguide for adjusting a phase of a light beam propagating through the at least one output waveguide;
a light emitting antenna array including a plurality of light emitting antennas, each light emitting antenna being provided corresponding to each output waveguide for receiving and emitting light output from the output waveguide;
at least one first optical coupler, each first optical coupler coupled to at least two optical transmit antennas;
at least one photodetector that detects at least the light output from each of the first optical couplers; and
and a controller for controlling a phase shift process of at least one of the phase shifters according to a detection result of the photodetector.
2. The optical phased array system of claim 1, wherein,
each of the first optical couplers is coupled with ends of the at least two light transmitting antennas.
3. The optical phased array system of claim 1, wherein the optical phased array system further comprises:
at least one of the second optical couplers is provided,
the second optical coupler couples the light output by at least two first optical couplers, or the second optical coupler couples the light output by at least two second optical couplers of the previous stage,
the at least one photodetector also detects light output by each of the second optocouplers.
4. The optical phased array system of claim 1, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector reaches a predetermined value.
5. The optical phased array system of claim 3, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector detecting the output light of the first optical coupler reaches the predetermined value,
then, the detection result of the output light of the second optical coupler for the preceding stage is made to reach the predetermined value.
6. The optical phased array system of any of claims 1-5, wherein,
the controller controls at least one of the phase shifters according to a detection result of the photodetector so that a phase between the light emitting antennas is changed or kept unchanged.
7. A control method of an optical phased array system, the optical phased array system comprising:
an input waveguide (input waveguide) for transmitting light;
a beam splitter (splitter) that splits the light transmitted by the input waveguide into a plurality of light beams;
an output waveguide array that transmits the plurality of light beams output by the beam splitter, the output waveguide array including a plurality of output waveguides;
a phase shifter array comprising a plurality of phase shifters, each phase shifter being disposed in correspondence with at least one output waveguide for adjusting a phase of a light beam propagating through the at least one output waveguide;
a light emitting antenna array including a plurality of light emitting antennas, each light emitting antenna being provided corresponding to each output waveguide for receiving and emitting light output from the output waveguide;
at least one first optical coupler, each first optical coupler coupled to at least two optical transmit antennas;
at least one photodetector that detects at least the light output from each of the first optical couplers; and
a controller in communication with the photodetector and at least one of the phase shifters,
the control method comprises the following steps:
the controller controls the phase shift process of at least one of the phase shifters according to the detection result of the photodetector.
8. The control method of claim 7, wherein the optical phased array system further comprises:
at least one of the second optical couplers is provided,
the second optical coupler couples the light output by at least two first optical couplers, or the second optical coupler couples the light output by at least two second optical couplers of the previous stage,
the at least one photodetector also detects light output by each of the second optocouplers.
9. The control method according to claim 7, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector reaches a predetermined value.
10. The optical phased array system of claim 9, wherein,
the controller controls at least one of the phase shifters such that a detection result of the photodetector detecting the output light of the first optical coupler reaches the predetermined value,
and then the light detection result output by the second optical coupler of the previous stage is made to reach the predetermined value.
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| CN117170156A (en) * | 2023-11-03 | 2023-12-05 | 赛丽科技(苏州)有限公司 | Optical phased array chip with reverse coupler, system and calibration method |
| CN117170156B (en) * | 2023-11-03 | 2024-02-09 | 赛丽科技(苏州)有限公司 | Optical phased array chip with reverse coupler, system and calibration method |
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