CN116248191A - Broadband optical multi-beam system based on phase modulation and implementation method - Google Patents
Broadband optical multi-beam system based on phase modulation and implementation method Download PDFInfo
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- CN116248191A CN116248191A CN202211572056.5A CN202211572056A CN116248191A CN 116248191 A CN116248191 A CN 116248191A CN 202211572056 A CN202211572056 A CN 202211572056A CN 116248191 A CN116248191 A CN 116248191A
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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
- H04B10/50—Transmitters
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- H04B10/506—Multiwavelength transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/50—Transmitters
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- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
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- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
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Abstract
The invention discloses a broadband optical multi-beam system based on phase modulation and an implementation method thereof, belonging to the technical field of broadband radio frequency signal processing, wherein the system comprises an optical multi-beam forming unit, N photoelectric conversion units and M electro-optic phase conversion units comprising radio frequency signal input ends; the method comprises the steps that M radio frequency signals are respectively input into M electro-optic phase conversion units to obtain M phase modulation optical signals; m phase modulation optical signals are input into an optical multi-beam forming unit to obtain N synthesized optical signals; the N synthesized optical signals are respectively input to N photoelectric conversion units to obtain N beam signals in different directions. The invention can remarkably expand the technical approach and capability of the existing optical multi-beam system and has the advantages of large instantaneous bandwidth, wide space coverage, high signal gain, small noise influence, small nonlinear effect influence, good beam consistency, simple system architecture and the like.
Description
Technical Field
The invention belongs to the technical field of broadband radio frequency signal processing, and particularly relates to a broadband optical multi-beam system based on phase modulation and an implementation method thereof.
Background
Electronic information devices such as electronic warfare, radio spectrum monitoring, communication, etc. must perform corresponding functions by receiving and processing radio frequency signals from the outside. In order to achieve high sensitivity and omnibearing interception capability of space signals, electronic information equipment needs to receive and process broadband radio frequency signals in a large spatial domain range, and therefore the equipment must have strong beam coverage capability. The multi-beam system can realize a plurality of beams simultaneously in a certain airspace range, and can realize detection and direction finding of weak signals under the condition of wide airspace opening. The multi-beam system constructed by the optical method has the advantages of high sensitivity, large instantaneous bandwidth, wide airspace coverage, good beam consistency and the like, and can be applied to various platforms such as ground, airplanes, satellites and the like.
The conventional optical multi-beam forming method mainly adopts delay weighting to amplitude modulation light waves of multiple paths of radio frequency signals so as to obtain beam signals in different directions (refer to patent number CN114217293A, patent name "light-operated multi-beam forming network chip and network", and patent number CN113452451A, patent name "beam forming and channelizing realized by microwave photonics"). However, the optical multi-beam system adopting amplitude modulation has the problems of low signal gain, large noise influence, serious nonlinear effect influence, severe laser wavelength interval and precision requirement and the like, and becomes a technical problem to be solved urgently by those skilled in the art.
Therefore, the present invention provides a broadband optical multi-beam system based on phase modulation and a realization method thereof, so as to at least solve the above-mentioned part of technical problems.
Disclosure of Invention
The invention aims to solve the technical problems that: a broadband optical multi-beam system based on phase modulation and a realization method thereof are provided to at least solve the above-mentioned part of technical problems.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the broadband optical multi-beam system based on phase modulation comprises an optical multi-beam forming unit, N photoelectric conversion units and M electro-optic phase conversion units comprising radio frequency signal input ends, wherein the radio frequency signals are respectively input into the M electro-optic phase conversion units, the M electro-optic phase conversion units are connected with the optical multi-beam forming unit, the optical multi-beam forming unit is provided with N synthesized optical signal output ports, and each synthesized optical signal output port is connected with one photoelectric conversion unit.
Further, the electro-optic phase conversion unit comprises a laser and an optical phase modulator connected with an emission port of the laser, and the optical phase modulator comprises a radio frequency signal input end for inputting a radio frequency signal.
Further, the optical multi-beam forming unit includes M1 xn optical couplers, N optical wavelength division multiplexers, and N optical interferometers connected to each 1 xn optical coupler, where an input end of each 1 xn optical coupler is connected to an output end of a corresponding one of the optical phase modulators, each 1 xn optical coupler includes N output ends, input ends of the N optical interferometers are respectively connected to the N output ends one by one, and output ends of the N optical interferometers connected to each 1 xn optical coupler are connected to input ends of the corresponding N optical wavelength division multiplexer, where n=1, 2,3, …, N.
Further, the optical interferometer comprises a 1×2 optical coupler a, an optical delay line and a 1×2 optical coupler B, wherein the input end of the 1×2 optical coupler a is connected with the output end of the corresponding 1×n optical coupler, the 1×2 optical coupler a comprises a first output end and a second output end, the first output end is connected with the input end of the optical delay line, and the second output end and the output end of the optical delay line are respectively connected with the input end of the 1×2 optical coupler B.
Further, the photoelectric conversion unit comprises photoelectric detectors, and the input end of each photoelectric detector is connected with the output end of the corresponding optical wavelength division multiplexer.
A realization method of a broadband optical multi-beam system based on phase modulation comprises the following steps:
step 1, M radio frequency signals are respectively input into M electro-optic phase conversion units to obtain M phase modulation optical signals;
step 2, inputting M phase modulation optical signals into an optical multi-beam forming unit to obtain N synthesized optical signals;
and step 3, respectively inputting the N synthesized optical signals to N photoelectric conversion units to obtain N beam signals in different directions.
Further, the lasers of the M electro-optic phase conversion units respectively emit M lasers with different wavelengths and input the lasers into the corresponding optical phase modulators, and meanwhile, the M radio frequency signals respectively enter the corresponding optical phase modulators and output M phase modulation optical signals after being modulated by the optical phase modulators.
Further, the M phase modulated optical signals are respectively input into M1 XN optical couplers, each 1 XN optical coupler outputs N split optical signals with equal power to obtain M XN parallel split optical signals CS m,n The method comprises the steps of carrying out a first treatment on the surface of the Branching optical signal CS m,n Input into corresponding optical interferometers m, n, and output processed optical signal PS m,n The method comprises the steps of carrying out a first treatment on the surface of the M processed optical signals PS 1,n 、PS 2,n 、…、PS m,n Simultaneously input to a corresponding wavelength division multiplexer n, and then output a synthesized optical signal n, where m=1, 2,3, …, M; n=1, 2,3, …, N.
Further, the optical signal CS is split m,n The optical signals are input into a 1X 2 optical coupler A corresponding to the optical interferometers m and n and are divided into two paths of signals, one path of signals is directly output to a 1X 2 optical coupler B, the other path of signals is output to the 1X 2 optical coupler B through an optical delay line, and finally the 1X 2 optical coupler B outputs a processed optical signal PS m,n 。
Further, the synthesized optical signal n is input to a photodetector corresponding to the photoelectric conversion unit n to obtain a pointing angle θ n Is provided.
Compared with the prior art, the invention has the following beneficial effects:
the invention obtains the corresponding phase modulation optical signals by modulating a plurality of broadband radio frequency signals onto the corresponding optical wave phases, then carries out coherent delay demodulation and synthesis on the plurality of phase modulation optical signals by adopting an optical technology, and finally obtains a plurality of beam signals in different directions simultaneously by photoelectric conversion. The invention can remarkably expand the technical approach and capability of the existing optical multi-beam system, has the advantages of large instantaneous bandwidth, wide space coverage, high signal gain, small noise influence, small nonlinear effect influence, good beam consistency, simple and convenient system architecture and the like, and has important application value in space broadband radio frequency signal reception in equipment such as electronic warfare, radio frequency spectrum monitoring, communication and the like.
Drawings
FIG. 1 is a block diagram of an implementation of the system of the present invention.
Fig. 2 is a block diagram of an implementation of the electro-optic phase conversion unit of the present invention.
Fig. 3 is a block diagram of an implementation of an optical multi-beam forming unit of the present invention.
Fig. 4 is a block diagram of an implementation of the optical interferometer of the present invention.
Fig. 5 is a block diagram of an implementation of the photoelectric conversion unit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "first," "second," "a," "B," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the invention provides a broadband optical multi-beam system based on phase modulation, which comprises an optical multi-beam forming unit, N photoelectric conversion units and M electro-optic phase conversion units comprising radio frequency signal input ends, wherein the radio frequency signals are respectively input into the M electro-optic phase conversion units, the M electro-optic phase conversion units are connected with the optical multi-beam forming unit, the optical multi-beam forming unit is provided with N synthesized optical signal output ports, and each synthesized optical signal output port is connected with one photoelectric conversion unit.
The invention also provides a realization method of the broadband optical multi-beam system based on phase modulation, which comprises the following steps:
step 1, M radio frequency signals are respectively input into M electro-optic phase conversion units to obtain M phase modulation optical signals;
step 2, inputting M phase modulation optical signals into an optical multi-beam forming unit to obtain N synthesized optical signals;
and step 3, respectively inputting the N synthesized optical signals to N photoelectric conversion units to obtain N beam signals in different directions.
The invention obtains the corresponding phase modulation optical signals by modulating a plurality of broadband radio frequency signals onto the corresponding optical wave phases, then carries out coherent delay demodulation and synthesis on the plurality of phase modulation optical signals by adopting an optical technology, and finally obtains a plurality of beam signals in different directions simultaneously by photoelectric conversion. The invention can remarkably expand the technical approach and capability of the existing optical multi-beam system, has the advantages of large instantaneous bandwidth, wide space coverage, high signal gain, small noise influence, small nonlinear effect influence, good beam consistency, simple and convenient system architecture and the like, and has important application value in space broadband radio frequency signal reception in equipment such as electronic warfare, radio frequency spectrum monitoring, communication and the like.
In some embodiments, as shown in fig. 2, the electro-optic phase conversion unit includes a laser, and an optical phase modulator connected to an emission port of the laser, where the optical phase modulator includes a radio frequency signal input terminal for inputting a radio frequency signal.
The lasers of the M electro-optic phase conversion units respectively emit M lasers with different wavelengths and input the lasers into the corresponding optical phase modulators, and M radio frequency signals respectively enter the corresponding optical phase modulators and output M phase modulation optical signals after being modulated by the optical phase modulators. The M radio frequency signals are received by the antenna array and are respectively input to the corresponding optical phase modulators.
In some embodiments, as shown in fig. 3, the optical multi-beam forming unit includes M1 xn optical couplers, N optical wavelength division multiplexers, and N optical interferometers connected to each 1 xn optical coupler, where an input end of each 1 xn optical coupler is connected to an output end of a corresponding one of the optical phase modulators, each 1 xn optical coupler includes N output ends, input ends of the N optical interferometers are respectively connected to the N output ends one by one, and an output end of an N optical interferometer connected to each 1 xn optical coupler is connected to an input end of a corresponding N optical wavelength division multiplexer, where n=1, 2,3, …, N.
The M phase modulation optical signals are respectively input into M1 XN optical couplers, and each 1 XN optical coupler outputs N branching optical signals with equal power to obtain M X N parallel branching optical signals CS m,n The method comprises the steps of carrying out a first treatment on the surface of the Branching optical signal CS m,n Input into corresponding optical interferometers m, n, and output processed optical signal PS m,n The method comprises the steps of carrying out a first treatment on the surface of the M processed optical signals PS 1,n 、PS 2,n 、…、PS m,n And simultaneously input to a corresponding wavelength division multiplexer n, and then output a synthesized optical signal n. The wavelength division multiplexer n has M channels, each having an input, for processing the optical signal PS 1,n 、PS 2,n 、…、PS m,n Respectively input to the corresponding channels and process the optical signal PS 1,n 、PS 2,n 、…、PS m,n Respectively, with the wavelengths of the corresponding channels, where M = 1,2,3, …, M; n=1, 2,3, …, N.
In some embodiments, as shown in fig. 4, the optical interferometer includes a 1×2 optical coupler a, an optical delay line, and a 1×2 optical coupler B, where an input end of the 1×2 optical coupler a is connected to an output end of the corresponding 1×n optical coupler, the 1×2 optical coupler a includes a first output end and a second output end, the first output end is connected to an input end of the optical delay line, and the second output end and an output end of the optical delay line are respectively connected to input ends of the 1×2 optical coupler B.
Branching optical signal CS m,n The signals are input into a 1X 2 optical coupler A corresponding to the optical interferometers m and n and are divided into two paths of signals, one path of signals is directly output to a 1X 2 optical coupler B, the other path of signals is output to the 1X 2 optical coupler B through an optical delay line, and finally the 1X 2 optical coupler B outputs an amplitude-modulated processed optical signal PS m,n 。
In some embodiments, as shown in fig. 5, the photoelectric conversion unit includes photodetectors, and an input end of each photodetector is connected to an output end of a corresponding optical wavelength division multiplexer. The synthesized optical signal n is input to a photoelectric detector corresponding to the photoelectric conversion unit n to obtain a pointing angle theta n Is provided.
For the nthPointing angle θ n The delay times of adjacent optical interferometers M, N (m=1, 2,3, …, M; n=1, 2,3, …, N) and optical interferometers m+1, N (m=1, 2,3, …, M-1; n=1, 2,3, …, N) are set to τ, respectively m,n And τ m+1,n Through tau m,n And τ m+1,n Can calculate the corresponding pointing angle theta n The calculation formula is
Where d is the array element spacing of the antenna array and c is the speed of light.
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention for illustrating the technical solution of the present invention, but not limiting the scope of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; that is, even though the main design concept and spirit of the present invention is modified or finished in an insubstantial manner, the technical problem solved by the present invention is still consistent with the present invention, and all the technical problems are included in the protection scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the invention.
Claims (10)
1. The broadband optical multi-beam system based on phase modulation is characterized by comprising an optical multi-beam forming unit, N photoelectric conversion units and M electro-optic phase conversion units comprising radio frequency signal input ends, wherein radio frequency signals are respectively input into the M electro-optic phase conversion units, the M electro-optic phase conversion units are connected with the optical multi-beam forming unit, the optical multi-beam forming unit is provided with N synthesized optical signal output ports, and each synthesized optical signal output port is connected with one photoelectric conversion unit.
2. The broadband optical multi-beam system according to claim 1, wherein the electro-optic phase conversion unit comprises a laser and an optical phase modulator coupled to an emission port of the laser, the optical phase modulator comprising a radio frequency signal input for inputting a radio frequency signal.
3. The broadband optical multi-beam system according to claim 2, wherein the optical multi-beam forming unit comprises M1 xn optical couplers, N optical wavelength division multiplexers, and N optical interferometers connected to each 1 xn optical coupler, an input terminal of each 1 xn optical coupler is connected to an output terminal of a corresponding one of the optical phase modulators, each 1 xn optical coupler comprises N output terminals, input terminals of the N optical interferometers are respectively connected to the N output terminals one by one, and an output terminal of the N optical interferometer connected to each 1 xn optical coupler is connected to an input terminal of a corresponding N optical wavelength division multiplexer, where N = 1,2,3, …, N.
4. A broadband optical multi-beam system based on phase modulation according to claim 3, wherein the optical interferometer comprises a 1 x 2 optical coupler a, an optical delay line and a 1 x 2 optical coupler B, the input end of the 1 x 2 optical coupler a is connected to the output end of the corresponding 1 x N optical coupler, the 1 x 2 optical coupler a comprises a first output end and a second output end, the first output end is connected to the input end of the optical delay line, and the output ends of the second output end and the optical delay line are respectively connected to the input ends of the 1 x 2 optical coupler B.
5. A broadband optical multibeam system based on phase modulation according to claim 3, wherein the photoelectric conversion unit comprises photodetectors, an input of each photodetector being connected to an output of a corresponding optical wavelength division multiplexer.
6. A method for implementing a broadband optical multi-beam system based on phase modulation, comprising the steps of:
step 1, M radio frequency signals are respectively input into M electro-optic phase conversion units to obtain M phase modulation optical signals;
step 2, inputting M phase modulation optical signals into an optical multi-beam forming unit to obtain N synthesized optical signals;
and step 3, respectively inputting the N synthesized optical signals to N photoelectric conversion units to obtain N beam signals in different directions.
7. The method of claim 6, wherein the lasers of the M electro-optic phase conversion units respectively emit M lasers with different wavelengths and input the lasers to the corresponding optical phase modulators, and the M radio frequency signals respectively enter the corresponding optical phase modulators, and the M phase modulated optical signals are output after being modulated by the optical phase modulators.
8. The method for implementing a broadband optical multi-beam system based on phase modulation according to claim 7, wherein M phase-modulated optical signals are respectively input to M1 xn optical couplers, each 1 xn optical coupler outputs N split optical signals with equal power, and M x N parallel split optical signals CS are obtained m,n The method comprises the steps of carrying out a first treatment on the surface of the Branching optical signal CS m,n Input into corresponding optical interferometers m, n, and output processed optical signal PS m,n The method comprises the steps of carrying out a first treatment on the surface of the M processed optical signals PS 1,n 、PS 2,n 、…、PS m,n Simultaneously input to a corresponding wavelength division multiplexer n, and then output a synthesized optical signal n, where m=1, 2,3, …, M; n=1, 2,3, …, N.
9. The method for implementing a broadband optical multi-beam system based on phase modulation according to claim 8, wherein the optical signal CS is split m,n The signals are input into a 1X 2 optical coupler A corresponding to the optical interferometers m and n and are divided into two paths of signals, one path of signals is directly output to a 1X 2 optical coupler B, the other path of signals is output to the 1X 2 optical coupler B through an optical delay line, and the mostThe processed optical signal PS is output by the 1X 2 optical coupler B m,n 。
10. The method as claimed in claim 8, wherein the synthesized optical signal n is input to a photodetector corresponding to the photoelectric conversion unit n to obtain a pointing angle θ n Is provided.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116527152A (en) * | 2023-07-03 | 2023-08-01 | 中国电子科技集团公司第二十九研究所 | Two-dimensional full aperture gain optical emission multi-beam forming system |
| CN116760476A (en) * | 2023-08-21 | 2023-09-15 | 中国电子科技集团公司第二十九研究所 | Self-adaptive beam forming method and device based on photonic neural network |
| CN116865862A (en) * | 2023-09-05 | 2023-10-10 | 成都唯博星辰科技有限公司 | Dynamic multipath simulation system of broadband signal and implementation method thereof |
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2022
- 2022-12-08 CN CN202211572056.5A patent/CN116248191A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116527152A (en) * | 2023-07-03 | 2023-08-01 | 中国电子科技集团公司第二十九研究所 | Two-dimensional full aperture gain optical emission multi-beam forming system |
| CN116527152B (en) * | 2023-07-03 | 2023-09-08 | 中国电子科技集团公司第二十九研究所 | Two-dimensional full aperture gain optical emission multi-beam forming system |
| CN116760476A (en) * | 2023-08-21 | 2023-09-15 | 中国电子科技集团公司第二十九研究所 | Self-adaptive beam forming method and device based on photonic neural network |
| CN116760476B (en) * | 2023-08-21 | 2023-10-31 | 中国电子科技集团公司第二十九研究所 | Self-adaptive beam forming method and device based on photonic neural network |
| CN116865862A (en) * | 2023-09-05 | 2023-10-10 | 成都唯博星辰科技有限公司 | Dynamic multipath simulation system of broadband signal and implementation method thereof |
| CN116865862B (en) * | 2023-09-05 | 2023-11-17 | 成都唯博星辰科技有限公司 | Dynamic multipath simulation system of broadband signal and implementation method thereof |
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