CN116841100A - Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment - Google Patents
Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment Download PDFInfo
- Publication number
- CN116841100A CN116841100A CN202310713109.9A CN202310713109A CN116841100A CN 116841100 A CN116841100 A CN 116841100A CN 202310713109 A CN202310713109 A CN 202310713109A CN 116841100 A CN116841100 A CN 116841100A
- Authority
- CN
- China
- Prior art keywords
- optical waveguide
- array
- phase shifter
- sub
- complex amplitude
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 121
- 230000033228 biological regulation Effects 0.000 title claims abstract description 13
- 230000010287 polarization Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- G02F1/295—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
-
- 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
- G02F1/01—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 intensity, phase, polarisation or colour
- G02F1/21—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 intensity, phase, polarisation or colour by interference
- G02F1/212—Mach-Zehnder type
-
- 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
- G02F1/01—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 intensity, phase, polarisation or colour
- G02F1/21—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 intensity, phase, polarisation or colour by interference
- G02F1/225—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 intensity, phase, polarisation or colour by interference in an optical waveguide structure
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The application discloses a stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment, wherein in the chip, a1 multiplied by 2 power divider array comprises M stages of 1 multiplied by 2 multimode interference couplers, wherein a first multimode interference coupler is connected to the input end of a first phase shifter array through a first optical waveguide, a second multimode interference coupler is connected to the input end of a second phase shifter array through a second optical waveguide, the first optical waveguide and the second optical waveguide are intersected to form a first chessboard area, and the first chessboard area comprises a double-ring cascade resonant cavity array; the output ends of the first phase shifter array and the second phase shifter array are respectively connected with a third optical waveguide and a fourth optical waveguide, the third optical waveguide and the fourth optical waveguide are intersected to form a second chessboard area, and the second chessboard area comprises a transmitting antenna array. The application can be used for phase modulationThe number of phase shifters is from N 2 The modulation power consumption of the chip is reduced to 3N.
Description
Technical Field
The application belongs to the technical field of optical phased arrays, and particularly relates to a stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment.
Background
The optical phased array has wide application in the fields of imaging, laser ranging and the like, and the optical waveguide has the advantages of high response speed, low control voltage, large scanning angle and the like, so that the optical phased array has been paid attention to in recent years.
At present, a design mode that each channel is matched with an independent phase controller is adopted for a fast-modulating optical waveguide phased array, but the fast-modulating optical waveguide phased array is limited by a laser process, along with the expansion of the integrated scale of a chip, the mode inevitably brings about the problem of high power consumption of full-chip modulation, challenges to instantaneous accurate constant temperature control of a TEC, increases the number of heating electrodes and the number of bond alloy wires on the chip, and brings about difficulty to chip packaging.
Existing wavefront coding devices, such as spatial light modulators, can only achieve single beam modulation, either modulating the intensity of the light field, or modulating the phase of the light field; for example, the optical waveguide phased array can only affect the optical field phase output by each antenna of the chip through thermo-optical, electro-optical and acousto-optic modulation, and the modulation requirement of the existing complex amplitude application cannot be met.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment. The technical problems to be solved by the application are realized by the following technical scheme:
in a first aspect, the present application provides a stepless-adjusting low-power-consumption complex-amplitude optical waveguide chip, comprising: comprising the following steps: the device comprises an input end, a polarization multiplexing unit, a1 multiplied by 2 power divider array, a phase shifter array, a transmitting antenna array and a double-loop cascade resonant cavity array, wherein the 1 multiplied by 2 power divider array is connected with the phase shifter array through an optical waveguide;
the 1 multiplied by 2 power divider array comprises cascaded M-stage 1 multiplied by 2 multimode interference couplers, the Mth-stage 1 multiplied by 2 multimode interference coupler comprises a first multimode interference coupler and a second multimode interference coupler, the phase shifter array comprises a first phase shifter array and a second phase shifter array, wherein the first multimode interference coupler is connected to an input end of the first phase shifter array through a first optical waveguide, the second multimode interference coupler is connected to an input end of the second phase shifter array through a second optical waveguide, and the first optical waveguide and the second optical waveguide are intersected to form a first chessboard area, and the first chessboard area comprises a double-loop cascade resonant cavity array;
the output ends of the first phase shifter array and the second phase shifter array are respectively connected with a third optical waveguide and a fourth optical waveguide, wherein the third optical waveguide and the fourth optical waveguide intersect to form a second chessboard area, and the second chessboard area comprises the transmitting antenna array.
In one embodiment of the application, the number of first multimode interference couplers is equal to the number of second multimode interference couplers.
In one embodiment of the present application, the transmitting antenna array includes n×n transmitting antennas, and the phase shifter array includes 2N thermo-optic phase shifters, where the number of thermo-optic phase shifters included in the first phase shifter array and the second phase shifter array is equal, and n=2 M-1 。
In one embodiment of the present application, the second optical waveguide includes a first sub-section, a second sub-section, and a third sub-section connected in sequence, and the third sub-section is connected to an input end of the second phase shifter array;
the first optical waveguide extends along a first direction, the first sub-portion and the third sub-portion both extend along the first direction, the second sub-portion extends along a second direction, and the first direction is perpendicular to the second direction.
In one embodiment of the present application, the fourth optical waveguide includes a fourth sub-section and a fifth sub-section connected in sequence, and the fourth sub-section is connected to the output end of the second phase shifter array;
the third optical waveguide extends along a first direction, the fourth sub-portion extends along the first direction, the fifth sub-portion extends along a second direction, and the first direction is perpendicular to the second direction.
In one embodiment of the present application, the first checkerboard region includes n×n checkerboards, the array of dual-ring cascaded resonators includes N dual-ring cascaded resonators, the N dual-ring cascaded resonators being located in N checkerboards on a diagonal of the first checkerboard region, respectively, each dual-ring cascaded resonator including two micro-ring modulators.
In one embodiment of the application, the second checkerboard region includes N x N checkerboards, each including a transmit antenna therein.
In one embodiment of the application, the material from which the chip is fabricated includes silicon-based SOI, thin-film lithium niobate, or III-V compound.
In one embodiment of the present application, the polarization multiplexing unit includes a Mach-Zehnder interferometer, a polarization rotator, and a reverse polarization rotator connected in sequence.
In a second aspect, the application also provides a wavefront coding device, which comprises the stepless regulation low-power consumption complex amplitude optical waveguide chip.
Compared with the prior art, the application has the beneficial effects that:
the application provides a stepless regulation low-power consumption complex amplitude optical waveguide chip, which forms a first chessboard area and a second chessboard area through a bi-directional crossed optical waveguide configuration, and effectively changes the number of phase shifters for phase modulation from N 2 3N (comprising N double-ring cascade resonant cavities and 2N thermo-optical phase shifters) is reduced, and the modulation power consumption of the optical waveguide phased array can be greatly reduced; meanwhile, the chip is led into a micro-ring modulator structure, so that electrodeless modulation of the intensity of the output light beam of the optical waveguide phased array is effectively realized. When the chip is applied to a wavefront encoder, the wavefront encoding capacity of the optical waveguide phased array can be effectively improved, so that the complex amplitude modulation of an output light beam is realized.
The present application will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of a stepless regulation low-power consumption complex amplitude optical waveguide chip according to an embodiment of the present application;
FIG. 2 is a partial schematic view of a first board region provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of micro-ring modulation provided by an embodiment of the present application;
FIG. 4 is a partial schematic view of a second board area provided by an embodiment of the present application;
FIG. 5a is a schematic diagram of intensity modulation provided by an embodiment of the present application;
FIG. 5b is a schematic diagram of intensity modulation and phase modulation provided by an embodiment of the present application;
fig. 6 is a schematic structural diagram of a wavefront coding apparatus according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to specific examples, but embodiments of the present application are not limited thereto.
Fig. 1 is a schematic structural diagram of a stepless regulation low-power consumption complex amplitude optical waveguide chip according to an embodiment of the present application. As shown in fig. 1, an embodiment of the present application provides a stepless-adjusting low-power-consumption complex-amplitude optical waveguide chip, including: the input end 10, the polarization multiplexing unit 20, the 1 multiplied by 2 power divider array 30, the phase shifter array 40, the transmitting antenna array 50 and the double-loop cascade resonant cavity array 60, wherein the 1 multiplied by 2 power divider array 30 is connected with the phase shifter array 40 through an optical waveguide 70;
the 1×2 power divider array 30 comprises cascaded M-stage 1×2 multimode interference couplers, the M-stage 1×2 multimode interference coupler comprises a first multimode interference coupler 301 and a second multimode interference coupler 302, the phase shifter array 40 comprises a first phase shifter array 401 and a second phase shifter array 402, wherein the first multimode interference coupler 301 is connected to an input end of the first phase shifter array 401 through a first optical waveguide 701, the second multimode interference coupler 302 is connected to an input end of the second phase shifter array 402 through a second optical waveguide 702, the first optical waveguide 701 intersects the second optical waveguide 702 to form a first chessboard area A1, and the first chessboard area A1 comprises the double-loop cascaded resonator array 60;
the output ends of the first phase shifter array 401 and the second phase shifter array 402 are respectively connected with a third optical waveguide 703 and a fourth optical waveguide 704, wherein the third optical waveguide 703 and the fourth optical waveguide 704 intersect to form a second chessboard area A2, and the second chessboard area A2 includes the transmitting antenna array 50.
In this embodiment, the stepless regulation low power consumption complex amplitude optical waveguide 70 chip includes an input end 10, a polarization multiplexing unit 20, a1×2 power divider array 30, a phase shifter array 40 and a transmitting antenna array 50, where the polarization multiplexing unit 20 includes a mach-zehnder interferometer, a polarization rotator and a reverse polarization rotator connected in sequence, the polarization multiplexing unit 20 can conduct light with different polarization states into a subsequent waveguide device, and the 1×2 power divider array 30 includes cascaded M-stage 1×2 multimode interference couplers for dividing single-path light into multiple paths.
Taking the example that the 1×2 power divider array 30 includes cascaded 5-stage 1×2 multimode interference couplers, please refer to fig. 1, the 5-stage 1×2 multimode interference coupler includes a first multimode interference coupler 301 and a second multimode interference coupler 302, the phase shifter array 40 includes a first phase shifter array 401 and a second phase shifter array 402, where the first multimode interference coupler 301 is connected to an input end of the first phase shifter array 401 via a first optical waveguide 701, the second multimode interference coupler 302 is connected to an input end of the second phase shifter array 40 via a second optical waveguide 702, and the extending directions of the first optical waveguide 701 and the second optical waveguide 702 are different, so as to intersect to form a first chessboard area A1, that is, a chessboard structure on the left side of the phase shifter array 40 in the view angle of fig. 1, and the first chessboard area A1 is provided with a double-loop cascaded resonant cavity array 60.
Of course, in some other embodiments of the present application, the 1×2 power divider array 30 may also be composed of a 3-stage, 4-stage, 6-stage, 7-stage, or 8-stage 1×2 multimode interference coupler cascade, which is not limited by the present application.
The output ends of the first phase shifter array 401 and the second phase shifter array 402 are respectively connected with a third optical waveguide 703 and a fourth optical waveguide 704, and similarly, the extension directions of the third optical waveguide 703 and the fourth optical waveguide 704 are different, a second chessboard area A2 is formed on the right side of the phase shifter array 40 under the view angle of fig. 1, and a transmitting antenna array 50 is arranged in the second chessboard area A2. In this embodiment, the phase shifter array 40 is used to adjust the phase of the output light field.
In this embodiment, the number of first multimode interference couplers 301 is equal to the number of second multimode interference couplers 302. Further, the transmit antenna array 50 includes N x N transmit antennas,the phase shifter array 40 includes 2N thermo-optic phase shifters, where the number of thermo-optic phase shifters included in the first phase shifter array 401 and the second phase shifter array 402 is equal, n=2 M-1 。
Illustratively, as shown in fig. 1, for a 16×16 transmit antenna array, the 1×2 power divider array 30 includes cascaded 5-stage 1×2 multimode interference couplers, each of the first multimode interference coupler 301 and the second multimode interference coupler 302 has 16, and correspondingly, the phase shifter array 40 includes 32 thermo-optic phase shifters, and the number of thermo-optic phase shifters included in each of the first phase shifter array 401 and the second phase shifter array 402 is also 16.
Optionally, the second optical waveguide 702 includes a first sub-section, a second sub-section, and a third sub-section connected in sequence, and the third sub-section is connected to the input of the second phase shifter array 402;
the first optical waveguide 701 extends along a first direction X, the first sub-portion and the third sub-portion both extend along the first direction X, and the second sub-portion extends along a second direction Y, and the first direction X is perpendicular to the second direction Y.
With continued reference to fig. 1, the plurality of first optical waveguides 701 correspondingly connected to the first multimode interference coupler 301 extend along the first direction X and are arranged along the second direction Y, and the plurality of second optical waveguides 702 correspondingly connected to the second multimode interference coupler 302 are S-shaped, specifically, the second optical waveguides 702 include a first sub-portion, a second sub-portion and a third sub-portion, which are sequentially connected, the first sub-portion and the third sub-portion extend along the first direction X, the second sub-portion extends along the second direction Y, and are finally connected to the input end of the second phase shifter array 402 through the third sub-portion.
FIG. 2 is a partial schematic view of a first board region according to an embodiment of the present application. As shown in fig. 2, the first checkerboard A1 includes n×n checkerboards, the dual-ring cascade resonator array 60 includes N dual-ring cascade resonators 601, and the N dual-ring cascade resonators 601 are respectively located in the N checkerboards on the diagonal of the first checkerboard, and each dual-ring cascade resonator includes two micro-ring modulators.
In this embodiment, the first direction X is perpendicular to the second direction Y, so in each checkerboard on the diagonal of the first checkerboard area A1, each dual-ring cascade resonant cavity envelopes two micro-ring modulators for modulating the output light field intensity of the transmitting antenna, and stepless adjustment of the output light field intensity of the whole antenna array can be achieved through the specific structure of diagonal arrangement. Specifically, in the first direction X, after the input light field is modulated by the micro-ring modulator, the input light field is combined with the light field in the second direction Y to form a new light field, and the new light field is transmitted along the second direction Y; on the other hand, in the second direction Y, the input light field is modulated by the micro-ring modulator and then combined with the light field in the first direction X, and the combined new light field is transmitted along the first direction X.
Fig. 3 is a schematic diagram of micro-ring modulation according to an embodiment of the present application. Referring to fig. 2 and 3, taking the first direction X as an example, the relationship between the input optical field and the output optical field of the dual-ring cascade resonator obtained by performing formula derivation according to the transmission matrix method is shown as follows:
in the method, in the process of the application,input light field representing an optical waveguide in a first direction X, is->Representing the output optical field of the optical waveguide in the first direction X after the modulation of the double-ring cascade resonator,/and->Representing the input light field of the light guide in the second direction Y (this part of the light does not participate in the calculation during the modulation),>representing the output optical fields K and K of the optical waveguide in the second direction Y after the modulation of the double-ring cascade resonator 0 Representing the coupling coefficients of the micro-ring modulator and the optical waveguide, respectively.
The same applies to the second direction Y, and thus will not be described here again.
Therefore, the control can be flexibly performed when the two-ring cascade resonant cavities are used for respectively carrying out phase modulationAnd->The two components change the intensity of the transmitted light field in the corresponding row and column, thereby changing the complex amplitude of the light field transmitted by the transmitting antenna array 50 and realizing the modulation of the intensity of the light field output by the chip.
From the above analysis, it can be seen that the introduction of the micro-ring modulator at the diagonal position of the first checkerboard A1 can change the phase of the adjacent waveguide, and thus the intensity of the output light field of the transmitting antenna, in which N phase shifters for intensity modulation are only required to realize the modulation of N 2 The light intensity of the road is regulated and controlled. In addition, in order to realize independent phase control, the embodiment also introduces 2N thermo-optic phase shifters, each thermo-optic phase shifter controls the phase of a row/column. The chip can modulate N by a coordinated combination of a micro-ring modulator array and a phase shifter array 40 2 The antennas output the complex amplitude of the light field.
With continued reference to fig. 1, the fourth optical waveguide 704 includes a fourth sub-section and a fifth sub-section connected in sequence, and the fourth sub-section is connected to an output terminal of the second phase shifter array 402;
the third optical waveguide 703 extends along a first direction X, the fourth sub-portion extends along the first direction X, and the fifth sub-portion extends along a second direction Y, and the first direction X is perpendicular to the second direction Y.
Optionally, the second checkerboard area A2 includes n×n checkerboards, each including a transmitting antenna therein.
Specifically, the third optical waveguide 703 extending in the first direction X crosses the fifth sub-portion extending in the second direction Y to form a checkerboard, and is coupled into the transmitting antenna through the directional coupler, thereby causing the transmitting antenna to emit light in the chip into space.
Fig. 4 is a schematic diagram of a portion of a second chessboard area according to an embodiment of the present application, fig. 5a is a schematic diagram of intensity modulation according to an embodiment of the present application, and fig. 5b is a schematic diagram of intensity modulation and phase modulation according to an embodiment of the present application. Further, the principle of operation of the checkerboard optical waveguide 70 arrangement of the present application is described with reference to fig. 4, 5a and 5 b. When neglecting the effect of the phase shifter array 40 on the optical field phase modulation in the optical waveguide 70, the n rows of third waveguides and the n columns of fourth waveguides intersect to form a second checkerboard area A2, each checkerboard in the second checkerboard area A2 is provided with a transmitting antenna, and the optical energy of the formed transmitting antenna array 50 is input through the directional coupler by the fifth sub-portions of the corresponding third optical waveguide 703 and fourth optical waveguide 704. Assume that the light field expression entering the mth row isThe light field expression entering the kth column is +.>Wherein a is m 、b k Respectively represent the light field amplitude, ζ of the mth row and the kth column m 、η k The optical field phases of the mth row and the kth column are respectively represented. The transmitting antenna is placed in a checkerboard formed by intersecting the third optical waveguide 703 and the fourth optical waveguide 704, combined by a directional coupler and a Y-type waveguide, and then transmitted into space by a grating antenna.
On the basis of structural optimization, the light field entering the transmitting antenna is not modulated by an amplitude and phase modulator, and at this time, the phase factor difference value of the light field input by the m-th row and k-th column of the transmitting antenna input end and the m-th row and k+1-th column of the transmitting antenna input end can be expressed as:
the above equation shows that by changing the optical field intensity and phase in both rows and columns of waveguides, the phase of the output optical field of adjacent antennas in both directions can be changed.
Furthermore, when changing the phase in the waveguide using an amplitude modulator, there may be an inherent phase when the amplitude of the optical field in the waveguide changes due to the device modulation mechanism itself. Thus, the present embodiment incorporates a corresponding phase modulator in the chip for independently varying the phase of the output optical field. By coordination between the amplitude modulator and the phase modulator, the phase of the light field output by the transmitting antenna can be changed more flexibly. With the addition of a phase modulator, the transmit antenna output light field distribution can be expressed as: the phase factor difference of the input light field of the m-th row and k-th column antenna and the m-th row and k+1-th column antenna can be expressed as:
wherein a is m 、b k 、ζ m And zeta k+1 Are all fixed values, the two are all fixed values,respectively representing the phase factors added by the phase modulation. As can be seen from comparing equation (4) and equation (5), in the actual control process, two types of modulators are required to cooperate with each other to realize stepless adjustment of the amplitude and phase of the output light field of the antenna.
Alternatively, the materials from which the chip is fabricated include silicon-based SOI, thin film lithium niobate, III-V compounds, or any material that can be used in planar optical waveguide technology processing.
Fig. 6 is a schematic structural diagram of a wavefront coding apparatus according to an embodiment of the present application. As shown in fig. 6, the embodiment of the application further provides a wavefront coding device, which comprises the stepless regulation low-power consumption complex amplitude optical waveguide chip.
According to the above embodiments, the beneficial effects of the application are as follows:
the application provides a stepless regulation low-power consumption complex amplitude optical waveguide chip, which forms a first chessboard area and a second chessboard area through a bi-directional crossed optical waveguide configurationA checkerboard area for effectively shifting the number of phase shifters from N 2 3N (comprising N double-ring cascade resonant cavities and 2N thermo-optical phase shifters) is reduced, and the modulation power consumption of the optical waveguide phased array can be greatly reduced; meanwhile, the chip is led into a micro-ring modulator structure, so that electrodeless modulation of the intensity of the output light beam of the optical waveguide phased array is effectively realized. When the chip is applied to a wavefront encoder, the wavefront encoding capacity of the optical waveguide phased array can be effectively improved, so that the complex amplitude modulation of an output light beam is realized.
In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The description of the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims.
The foregoing is a further detailed description of the application in connection with the preferred embodiments, and it is not intended that the application be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.
Claims (10)
1. A stepless regulation low power consumption complex amplitude optical waveguide chip, characterized by comprising: the device comprises an input end, a polarization multiplexing unit, a1 multiplied by 2 power divider array, a phase shifter array, a transmitting antenna array and a double-loop cascade resonant cavity array, wherein the 1 multiplied by 2 power divider array is connected with the phase shifter array through an optical waveguide;
the 1 multiplied by 2 power divider array comprises cascaded M-stage 1 multiplied by 2 multimode interference couplers, the Mth-stage 1 multiplied by 2 multimode interference coupler comprises a first multimode interference coupler and a second multimode interference coupler, the phase shifter array comprises a first phase shifter array and a second phase shifter array, wherein the first multimode interference coupler is connected to an input end of the first phase shifter array through a first optical waveguide, the second multimode interference coupler is connected to an input end of the second phase shifter array through a second optical waveguide, and the first optical waveguide and the second optical waveguide are intersected to form a first chessboard area, and the first chessboard area comprises a double-loop cascade resonant cavity array;
the output ends of the first phase shifter array and the second phase shifter array are respectively connected with a third optical waveguide and a fourth optical waveguide, wherein the third optical waveguide and the fourth optical waveguide intersect to form a second chessboard area, and the second chessboard area comprises the transmitting antenna array.
2. The infinitely variable control low power consumption complex amplitude optical waveguide chip of claim 1, wherein the number of first multimode interference couplers is equal to the number of second multimode interference couplers.
3. The infinitely variable control low power consumption complex amplitude optical waveguide chip of claim 2, wherein the transmit antenna array comprises N x N transmit antennas, theThe phase shifter array comprises 2N thermo-optic phase shifters, wherein the number of the thermo-optic phase shifters contained in the first phase shifter array is equal to the number of the thermo-optic phase shifters contained in the second phase shifter array, and n=2 M-1 。
4. The infinitely variable control low power complex amplitude optical waveguide chip of claim 3, wherein the second optical waveguide comprises a first sub-section, a second sub-section, and a third sub-section connected in sequence, and the third sub-section is connected to the input of the second phase shifter array;
the first optical waveguide extends along a first direction, the first sub-portion and the third sub-portion both extend along the first direction, the second sub-portion extends along a second direction, and the first direction is perpendicular to the second direction.
5. The infinitely variable control low power consumption complex amplitude optical waveguide chip of claim 3, wherein the fourth optical waveguide comprises a fourth sub-section and a fifth sub-section connected in sequence, and the fourth sub-section is connected with the output end of the second phase shifter array;
the third optical waveguide extends along a first direction, the fourth sub-portion extends along the first direction, the fifth sub-portion extends along a second direction, and the first direction is perpendicular to the second direction.
6. The infinitely variable control low power complex amplitude optical waveguide chip of claim 5, wherein the first checkerboard region comprises N x N checkerboards, the array of dual-ring cascaded resonators comprises N dual-ring cascaded resonators, the N dual-ring cascaded resonators are located in the N checkerboards on a diagonal of the first checkerboard region, respectively, each dual-ring cascaded resonator comprises two micro-ring modulators.
7. The infinitely variable control low-power complex amplitude optical waveguide chip of claim 6, wherein the second tessellation comprises N x N tessellations, each comprising a transmit antenna therein.
8. The infinitely variable control low power complex amplitude optical waveguide chip of claim 1, wherein the material from which the chip is fabricated comprises silicon-based SOI, thin film lithium niobate, or III-V compounds.
9. The infinitely variable control low power consumption complex amplitude optical waveguide chip of claim 1, wherein the polarization multiplexing unit comprises a mach-zehnder interferometer, a polarization rotator, and a reverse polarization rotator connected in sequence.
10. A wavefront coding apparatus comprising a steplessly adjustable low power complex amplitude optical waveguide chip as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310713109.9A CN116841100A (en) | 2023-06-15 | 2023-06-15 | Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310713109.9A CN116841100A (en) | 2023-06-15 | 2023-06-15 | Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116841100A true CN116841100A (en) | 2023-10-03 |
Family
ID=88173545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310713109.9A Pending CN116841100A (en) | 2023-06-15 | 2023-06-15 | Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116841100A (en) |
-
2023
- 2023-06-15 CN CN202310713109.9A patent/CN116841100A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110174661B (en) | Optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing | |
| US7492975B2 (en) | Optical switch, optical modulator and wavelength variable filter | |
| JP2844525B2 (en) | Polarization independent optical device | |
| US6842569B2 (en) | Polarization independent broad wavelength band optical switches/modulators | |
| US9360629B2 (en) | Waveguide type optical switch | |
| JP2022516194A (en) | Polarization-independent photonic device with multi-mode component | |
| CN116088244B (en) | Cascade phased array optical scanning system | |
| CN112764287A (en) | Half-wave two-dimensional scanning optical phased array based on flat grating antenna | |
| CN113534167A (en) | Phased array laser radar chip with switchable antennas, use method and laser radar | |
| Sun et al. | Broadband 1× 8 optical beamforming network based on anti-resonant microring delay lines | |
| US5202941A (en) | Four section optical coupler | |
| CN111487602B (en) | Optical phased array, laser radar and optical power distribution method | |
| CN116841100A (en) | Stepless regulation low-power consumption complex amplitude optical waveguide chip and wavefront coding equipment | |
| Notaros et al. | Integrated optical phased array butterfly architecture for independent amplitude and phase control | |
| CN116739063A (en) | Neural network accelerator based on multimode interferometer and coherent detection | |
| HORIKAWA et al. | Photonic integrated beam forming and steering network using switched true-time-delay silica-based waveguide circuits | |
| CN114966967B (en) | Space light field regulation and control device based on super structure surface of guided wave drive | |
| JP3271449B2 (en) | Beam forming circuit for phased array | |
| CN117250779B (en) | Laser scanning unit, module, laser emitting device and laser radar | |
| Quang et al. | 1× 3 reconfigurable and simultaneous three-mode selective router based on silicon waveguide utilizing Ti microheaters as thermo-optic phase shifters | |
| CN113534564A (en) | Method and device for improving scanning angle of optical phased array | |
| JP4109514B2 (en) | Optical waveguide device for polarization control | |
| JP2004354960A (en) | Optical switch, directional coupler type modulator with non-crossed electrode, and optical communication system | |
| WO2006100719A1 (en) | Optical device | |
| Duy et al. | Numerical design and optimization of a high compact, broadband optical three-mode selective converter by manipulating ITO-based controllable phase shifters integrated on silicon-on-insulator waveguides |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |