CN113949456A - Numerical control light beam synthesis chip device - Google Patents
Numerical control light beam synthesis chip device Download PDFInfo
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- CN113949456A CN113949456A CN202111158114.5A CN202111158114A CN113949456A CN 113949456 A CN113949456 A CN 113949456A CN 202111158114 A CN202111158114 A CN 202111158114A CN 113949456 A CN113949456 A CN 113949456A
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- 230000003287 optical effect Effects 0.000 claims abstract description 96
- 239000006185 dispersion Substances 0.000 claims abstract description 57
- 230000001934 delay Effects 0.000 claims abstract description 8
- 238000005485 electric heating Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 7
- 239000000969 carrier Substances 0.000 description 5
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- 239000013307 optical fiber Substances 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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- H—ELECTRICITY
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Abstract
The invention discloses a numerical control optical beam synthesis chip device, which comprises an optical dispersion waveguide, an optical non-dispersion waveguide and an alternative optical switch, wherein the input end of the optical dispersion waveguide is connected with a multi-wavelength radio frequency optical carrier signal generated by a microwave photon radar, the optical dispersion waveguide has stable optical dispersion and can generate accurate dispersion delay for passing different wavelengths of light, the optical switch has programmable characteristics, a slave switch can be controlled by digital signals to select a path, the level 0 represents to select an upper path, the level 1 represents to select a lower path, and after the input multi-wavelength optical signal is selected by different states of the optical switch, the input multi-wavelength optical signal can pass through different numbers of dispersion waveguides and generate corresponding different delays from different delay output ports at the tail end. The invention not only solves the problems of insufficient delay precision, non-uniform dispersion coefficient, precise beam control and the like when a microwave photon beam synthesis system is used for delaying in the prior art.
Description
Technical Field
The invention belongs to the technical field of microwave photon technology and radar phased array.
Background
In the conventional phased array system, the antenna beam scanning is realized by adjusting the phase relation between the radiation units, however, the all-electronic control system for realizing the phased array antenna unit by using microwave components has many problems. First, the phase shifter itself implemented by microwave technology has a high complexity, and the loss (especially in the millimeter wave band) and weight of the microwave phase shifter itself are also one of the important factors that limit the performance of the phased array radar. Secondly, the phased array delays signals by controlling the phases of the signals, which causes that the signals with different frequencies have different time delays even if the signals have the same phase delay, so that the traditional phased array antenna has the problem of beam pointing deflection under the condition of broadband signals, thereby causing that the traditional phased array radar technology cannot obtain large instantaneous signal bandwidth, and directly influencing the resolution, identification and imaging capability of the radar on targets.
In recent years, the microwave photon technology is applied to radar, communication and electronic warfare systems, aperture transit time is compensated by a real-time delay method in an optical domain, and broadband wide-angle scanning of the phased array radar can be realized; meanwhile, the optical true time delay transmission has the inherent advantages of low loss, wide frequency band, electromagnetic interference resistance and the like. Therefore, the method can meet the development requirements of modern war on radar omnibearing and high performance, and becomes an important direction for the development of phased array radar.
For example, patent application with publication number CN111181683A discloses an apparatus and a design method for an ultra-wideband receiver based on microwave photons, in which optical control beam synthesis and optical channelization function modules are connected by optical transmission through an optical wavelength division multiplexing technology, so as to implement a process of processing microwave radio frequency signal broadband reception in an optical domain.
At present, the microwave photon beam synthesis technology mainly comprises two systems based on dispersion delay and length delay, and the above-mentioned patent documents adopt a synthesis system based on length delay. Microwave photon beam synthesis based on a dispersion delay system generally adopts optical fibers as delay units, and realizes the signal delay of corresponding channels of antenna units by utilizing the difference of dispersion effect on the delay of laser signals with different wavelengths. The requirement of system equipment quantity for realizing time delay processing based on the dispersion optical fiber technology is small, beams with different directions can be realized through dispersion optical fibers with different lengths, but the wavelength of an optical carrier needs to be accurately controlled, and meanwhile, the practicability is limited due to inconsistent time delay caused by the non-uniformity of the dispersion coefficient of the dispersion optical fiber. And the microwave photon beam synthesis based on the length delay system adopts delay time difference generated by the light-carrying radio frequency signals corresponding to different channels passing through different light paths to realize the signal delay of the corresponding channel of the antenna unit. The beam forming system based on the length delay system is simple in structure, but when the number of antenna array elements is large, the equipment amount is huge, and when the phased array system works in a high-frequency band, particularly in a frequency band above millimeter waves, the requirement on accurate control of delay length of each channel is high, and the difficulty is high in practical engineering application.
Disclosure of Invention
In order to solve the problems of insufficient delay precision, non-uniform dispersion coefficient, precise beam control and the like of using a microwave photon beam synthesis system for delay in the prior art, the invention provides a numerical control light beam synthesis chip device. Microwave signals of different antenna arrays are modulated onto optical carriers with different wavelengths, and different delay paths are selected through optical wavelength switching to realize different beam directions; radio frequency signal information carrying different columns is achieved through a multi-wavelength optical frequency comb and is directly transmitted into a microwave photon channelized module through light, different wavelengths are distributed to different channelized units through wavelength division demultiplexing in the module, intermediate frequency channelized signals of corresponding columns are obtained through different channelized units and finally combined together, and the purpose of beam synthesis is achieved.
The invention is realized by the following technical means: a numerical control optical beam synthesis chip device integrates a plurality of stages of optical dispersion waveguides, optical non-dispersion waveguides and a plurality of alternative optical switches on an optical chip, and realizes the selection of input light to output different channels by switching the states of the optical switches, wherein the optical dispersion waveguides have stable optical dispersion and can generate accurate dispersion delay for the input light passing through different wavelengths. The optical switch has programmable characteristic, and can select the path from the switch by digital signal control, wherein 0 level represents to select the up path, and 1 level represents to select the down path.
Furthermore, the optical dispersion waveguide can control and adjust the dispersion value through the embedded electrode, and when the input signal is a multi-wavelength optical carrier, the fine-tuned dispersion delay can be realized, and the dispersion delay corresponds to different beam directions.
Furthermore, the input end of the optical chip is connected with a multi-wavelength radio frequency optical carrier signal generated by the microwave photon radar, and the input multi-wavelength optical signal can pass through different numbers of dispersion waveguides after being selected by different states of the optical switch, so that corresponding different delays are generated from different delay output ports at the tail end.
Furthermore, the optical dispersion waveguide can accurately control the dispersion value thereof through material growth, and is connected with one end of the optical switch through a common non-dispersive optical waveguide.
Furthermore, the optical switch is of an alternative numerical control type, the low level controls the lower circuit to select the upper circuit, and the high level controls the lower circuit to select the lower circuit.
Furthermore, the optical dispersion waveguide can adjust the dispersion value by embedding an electrode at the bottom and applying electric heating.
The invention has the beneficial effects that:
(1) the numerical control adjustable optical beam synthesis chip comprises a plurality of optical switches, and can output a designated delay difference through numerical control;
(2) the optical dispersion waveguide is easy to realize, can be suitable for dispersion delay of multi-wavelength optical carriers, and has simple structure and obvious effect.
Drawings
FIG. 1 is a schematic diagram of the structure of an optical chip according to the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples. The embodiments are carried out on the premise of the technical scheme of the invention, and detailed embodiments and processes are given, but the scope of the invention is not limited to the following embodiments.
Fig. 1 is a schematic diagram of a structural principle of an optical chip according to the present invention, where the chip includes an optical dispersion waveguide, an optical non-dispersion waveguide, and an optical switch, where an input end of the optical chip is connected to a multi-wavelength radio frequency optical carrier signal generated by a microwave photonic radar, the optical dispersion waveguide has stable optical dispersion, and can generate accurate dispersion delay for passing different wavelengths of light, the optical switch has a programmable characteristic, and can control a slave switch to select a path through a digital signal, a level 0 represents selecting an upper path, a level 1 represents selecting a lower path, and after the input multi-wavelength optical signal is selected by different states of the optical switch, the input multi-wavelength optical signal can pass through different numbers of dispersion waveguides, and generate corresponding different delays from different delay output ports at a terminal. As shown in fig. 1, the total of n beam pointing delay control words formed by the optical switches corresponds to n controllable dispersion delays, where the inter-wavelength delay of delay 0 is 0, which corresponds to 0 beam pointing in the beam pointing.
For the convenience of understanding, the technical solution of the present invention is described in detail below with reference to a specific embodiment in fig. 2. In the present embodiment, a 4 × 4 receiving sub-array of the detection radar is exemplified, which includes 4 × 4 antenna arrays, rf front-end processing (filtering, low noise amplifier, and column combiner), 4 optical modulators, an optical wavelength division multiplexer, an optical beam combiner chip, an optical coupler, and a photodetector.
In the example, the optical beam combining chip has 4 optical switches and 4 optical dispersion waveguides, and 5 delays including 0 delay can be formed.
The workflow of the example is as follows:
(1) signals received by the array antenna are processed by a front end to synthesize 4 rows of radio frequency signals, and the signals are respectively modulated onto optical carriers with 4 wavelengths of lambda 1, lambda 2, lambda 3 and lambda 4 by a photoelectric modulator, wherein the interval of the lambda 1, the lambda 2, the lambda 3 and the lambda 4 is selected to be 0.4nm, and the condition of wavelength division multiplexing is met.
(2) The 4-wavelength optical carriers enter the optical beam synthesizing chip, 4-level optical dispersion waveguides in the optical beam synthesizing chip have the same characteristics, and the dispersion value is 10ps/nm, so that each level of optical dispersion waveguides can bring 4ps of true delay, the beam control words are 5, namely 0000, 1000, 1100, 1110 and 1111, and each byte respectively corresponds to the states of the optical switches 1-5, namely 5 working codes.
(3) In the above 5 working states, the corresponding delay between each wavelength is: 4ps, 8ps, 12ps, 16 ps.
(4) The 4 paths of delayed optical carriers are detected by a photoelectric detector, and the carried true delay is converted into a corresponding beam direction.
Claims (6)
1. A chip apparatus for digitally controlled optical beam synthesis, comprising: the multi-level optical dispersion waveguide, the optical non-dispersion waveguide and the multiple one-out-of-two optical switches are integrated, input light is output by selecting different channels by switching the states of the optical switches, wherein the optical dispersion waveguide has stable optical dispersion and can generate accurate dispersion delay for the input light passing through different wavelengths, the optical switches have programmable characteristics, slave switch selection paths can be controlled through digital signals, the level 0 represents selection of an upper path, and the level 1 represents selection of a lower path.
2. The chip apparatus according to claim 1, wherein: the optical dispersion waveguide can control and adjust the dispersion value through the embedded electrode, when an input signal is a multi-wavelength optical carrier, fine-tuning dispersion delay can be realized, and the optical dispersion waveguide corresponds to different beam directions.
3. The chip apparatus according to claim 1, wherein: the input end of the optical chip is connected with a multi-wavelength radio frequency optical carrier signal generated by a microwave photon radar, and the input multi-wavelength optical signal can pass through different numbers of dispersion waveguides after being selected by different states of an optical switch, and generates corresponding different delays from different delay output ports at the tail end.
4. The chip apparatus according to claim 1, wherein: the optical dispersion waveguide can accurately control the dispersion value through material growth, and is connected with one end of an optical switch through a common non-dispersive optical waveguide.
5. The chip apparatus according to claim 1, wherein: the optical switch is of an alternative numerical control type, and the low level controls the lower circuit to select the upper circuit, and the high level controls the lower circuit to select the lower circuit.
6. The chip apparatus according to claim 1, wherein: the optical dispersion waveguide can be provided with an electrode embedded at the bottom, and the dispersion value can be adjusted by an electric heating mode.
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| CN202111158114.5A CN113949456A (en) | 2021-09-30 | 2021-09-30 | Numerical control light beam synthesis chip device |
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| CN202111158114.5A CN113949456A (en) | 2021-09-30 | 2021-09-30 | Numerical control light beam synthesis chip device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019095490A1 (en) * | 2017-11-15 | 2019-05-23 | 西南交通大学 | Radio-over-fiber communication beamforming device and method using arrayed waveguide optical grating |
| CN112468256A (en) * | 2020-11-04 | 2021-03-09 | 清华大学 | Chromatic dispersion and non-chromatic dispersion device cascade large-scale optical true time delay network based on wavelength division multiplexing |
| CN112684541A (en) * | 2021-01-19 | 2021-04-20 | 浙江大学 | Cascade type adjustable silicon-based Bragg grating dispersion compensator |
| CN113067635A (en) * | 2021-03-22 | 2021-07-02 | 中国电子科技集团公司第三十八研究所 | Transmit-receive integrated phased array beam forming device based on integrated optical delay chip |
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- 2021-09-30 CN CN202111158114.5A patent/CN113949456A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019095490A1 (en) * | 2017-11-15 | 2019-05-23 | 西南交通大学 | Radio-over-fiber communication beamforming device and method using arrayed waveguide optical grating |
| CN112468256A (en) * | 2020-11-04 | 2021-03-09 | 清华大学 | Chromatic dispersion and non-chromatic dispersion device cascade large-scale optical true time delay network based on wavelength division multiplexing |
| CN112684541A (en) * | 2021-01-19 | 2021-04-20 | 浙江大学 | Cascade type adjustable silicon-based Bragg grating dispersion compensator |
| CN113067635A (en) * | 2021-03-22 | 2021-07-02 | 中国电子科技集团公司第三十八研究所 | Transmit-receive integrated phased array beam forming device based on integrated optical delay chip |
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Address after: 210003 No. 346, Zhongshan North Road, Jiangsu, Nanjing Applicant after: 724 Research Institute of China Shipbuilding Corp. Address before: 210003 No. 346, Zhongshan North Road, Jiangsu, Nanjing Applicant before: 724TH RESEARCH INSTITUTE OF CHINA SHIPBUILDING INDUSTRY Corp. |