CN113193916A - Microwave multi-beam optical receiving and demodulating system and using method thereof - Google Patents
Microwave multi-beam optical receiving and demodulating system and using method thereof Download PDFInfo
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- CN113193916A CN113193916A CN202110495496.4A CN202110495496A CN113193916A CN 113193916 A CN113193916 A CN 113193916A CN 202110495496 A CN202110495496 A CN 202110495496A CN 113193916 A CN113193916 A CN 113193916A
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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
- H04B10/25—Arrangements specific to fibre transmission
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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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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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
- H04B10/60—Receivers
Abstract
A microwave multi-beam optical receiving and demodulating system and a using method thereof are disclosed, wherein radio frequency signals in different directions and frequencies received by a microwave antenna array are up-converted to an optical domain through an electro-optical modulator and transmitted to the optical antenna array in an optical fiber, meanwhile, an emergent light beam is collimated and expanded by a micro-lens array, and real-time phase regulation and control of the light beam are realized by a space light phase modulator, so that signal light carrying microwave beam information can be always converged at a corresponding position of a photoelectric detector array. And finally, based on the stable local oscillator light generated by the optical local oscillator generating unit and the spatial beam expansion processing, coherent beat frequency of the signal light and the local oscillator light is realized by adopting a high-speed photoelectric detector, and down-conversion receiving demodulation of the radio frequency signal is completed. The invention utilizes simple space optical devices to process a plurality of beams, greatly simplifies the system structure and enhances the compatibility of the system; and can realize the receiving and demodulation of microwave information under the two conditions of microwave time agile wave beams and simultaneous multi-wave beams.
Description
Technical Field
The invention belongs to the technical field of microwave mobile communication, and particularly relates to a microwave multi-beam optical receiving and demodulating system and a using method thereof.
Background
In conventional multi-beam reception networks, there is typically a limit to the number of beams received by the system multiplied by their instantaneous bandwidth. The method comprises the steps that signals from all directions in space are captured by a receiving network based on an omnidirectional antenna, so that the received radio-frequency signals of a target direction are weak in power; the receiving network based on the directional antenna needs to mechanically adjust the antenna direction to enable the signal gain of the target position to be maximum, which is not beneficial to the real-time performance of signal receiving; in a receiving network based on digital multi-beam forming, analog signals received by the system are converted into digital signals through an analog-to-digital converter (ADC), phase shifting and beam forming are realized through calculation of the digital signals, but the volume of processed data is increased sharply due to increase of the number of beams, and huge challenges are brought to the system in terms of volume, weight and power consumption. Therefore, these multi-beam receiving systems have limitations in the receiving process of the large spatial domain multi-beam.
For related references, see:
[1] lipaicine, research on phased array radar beam forming and interference suppression technologies, master academic thesis, university of electronic technology, 2019.
Compared with the traditional multi-beam network receiving scheme, the microwave multi-beam optical receiving and demodulating system provided by the invention realizes focal plane convergent imaging receiving by utilizing the analog beam forming capability of an optical lens in the traditional optical imaging system, and realizes the simultaneous receiving of multi-beams in different directions and different angular frequencies in space by a photoelectric detector array. The novel multi-beam receiving mode can process a plurality of beams by using a simple optical lens, and the system is simpler; the anti-interference capability is stronger compared with the traditional multi-beam receiving system; the compatibility is better.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a microwave multi-beam optical receiving and demodulating system and a using method thereof, which can effectively solve the problems of complexity, high calculation cost and the like of the traditional multi-beam network receiving system in the background technology.
The technical scheme adopted by the invention for solving the problems is as follows:
a microwave multi-beam optical receiving and demodulating system comprises an upper part and a lower part.
The upper part comprises a microwave antenna array 1, an electro-optic modulator array 2, a transmission optical fiber 3, an optical antenna array 4, an optical filter 5, a spatial optical phase modulator 6, an optical lens 7, an optical beam splitter 8 and a photoelectric detector array 9 from left to right in sequence; the microwave antenna array 1 is connected with the electro-optical modulator array 2 through a cable, the electro-optical modulator array 2 is connected with the optical antenna array 4 through a transmission optical fiber 3, the transmission optical fiber 3 realizes optical fiber zooming, meanwhile, consistency of channel loss and time delay can be guaranteed, and other parts needing to be connected are connected through optical fibers or optical cables. The optical antenna array 4, the optical filter 5, the spatial light phase modulator 6, the optical lens 7, the optical beam splitter 8 and the photoelectric detector array 9 need to be coaxial.
The lower part comprises an optical splitter 10, a laser 11, a local oscillator light generating unit 12 and a beam expanding collimating lens 13; the laser 11 is connected with the electro-optical modulator array 2 through an optical splitter 10, the laser 11, the local oscillator light generating unit 12 and the beam expanding collimating lens 13 are sequentially arranged from left to right, and the parts of the above components needing to be connected are all connected through optical fibers or optical cables. The beam expanding and collimating lens 13 and the optical beam splitter 8 need to be coaxial.
The working frequency bands of the microwave antenna array 1 and the electro-optical modulator array 2 of the system can cover S-Ka and millimeter wave frequency bands. The transmission optical fiber 3 routes the light wave beam output by the electro-optical modulator array 2 to the optical antenna array 4, and the optical antenna array 4 collimates the light wave beam output by the electro-optical modulator array 2; the optical filter 5 is used for filtering out sideband signals (for example, lower sidebands) carrying microwave echo beam information after passing through the optical antenna array 4; the signal light filtered by the optical filter 5 passes through the spatial light phase modulator 6, the spatial light phase modulator 6 performs phase modulation on the signal light, and the signal light is transmitted to the optical beam splitter 8 through the optical lens 7; focusing the signal light beam after phase modulation of the spatial light phase modulator 6 on a photoelectric detector array 9 through an optical lens 7 for optical heterodyne coherent beat frequency reception, wherein the spatial light phase modulator 6 generates compensated phase distribution by controlling the deflection of liquid crystal molecules so that the signal light is always converged at a corresponding position of the photoelectric detector array; the optical beam splitter 8 combines the signal light after two beams of light are respectively filtered by the optical filter 5 and the local oscillator light after beam expansion and collimation by the beam expansion and collimation lens 13 into a beam of light; the photoelectric detector array 9 realizes coherent beat frequency receiving of signal light and local oscillator light; the optical splitter 10 can divide one path of light into multiple paths of light and feed the light to the electro-optical modulator array 2 for optical modulation; the laser 11 provides an optical carrier signal for the electro-optical modulator array 2; the local oscillator light generating unit 12 provides a stable local oscillator light signal for receiving and demodulating the radio frequency signal; the beam expanding and collimating lens 13 expands the beam of the local oscillator optical signal and collimates the local oscillator optical signal into spatial light. The signal light passing through the optical filter 5 and the optical carrier required by the local oscillator light expanded and collimated by the expanded beam collimating lens 13 both come from the laser 11, so that good phase matching is ensured when two beams of light are combined to perform beat frequency, and the signal-to-noise ratio of the demodulated signal is ensured.
Further, the optical cables between the electro-optical modulator array 2 and the optical antenna array 4 are to maintain channel consistency.
Furthermore, the optical filter 5 needs a small 3dB bandwidth and a high roll-off degree, and realizes the extraction of a high-quality sideband signal.
Further, the difference between the frequency of the signal light filtered by the optical filter 5 and the frequency of the local oscillator light generated by the local oscillator light generating unit should not be greater than the cut-off frequency of the photodetector array 9.
Further, the stable local oscillator optical signal provided by the local oscillator optical generation unit 12 may be provided by a single-sideband injection locked distributed feedback laser, or may be provided by an optical phase-locked loop.
A method for using a microwave multi-beam optical receiving and demodulating system comprises the following steps:
the frequency f received by the microwave antenna array 1RF1Is transmitted into the electro-optical modulator array 2 via a cable and is modulated by the electro-optical modulator array 2 to a frequency f provided by a laser 11cOn the optical carrier wave of (2), the output frequency of f from the electro-optical modulator array 2cOptical carrier and first order sideband signal fc+fRF1And fc-fRF1And in the multiplex transmission fiber 3, with a medium delay. Filtered by an optical filter 5 to a frequency fcOptical carrier of frequency fc+fRF1Upper sideband with reserve frequency fc-fRF1The lower sideband of (a);
the local oscillation light generating unit 12 generates a frequency fc-fRF2The light is collimated by the beam expanding and collimating lens 13 and then filtered and output by the optical filter 5, and the frequency of the collimated light is fc-fRF1Light is mixed at a frequency fc-fRF1And fc-fRF2The mixed light beam passes through the photoelectric detector array 9, the difference frequency output frequency is fRF1-fRF2Thus, the receiving and demodulation of the radio frequency signal are realized.
Fig. 1 is a schematic diagram of a microwave multi-beam optical receive-demodulation system of the present invention. The receiving angular frequency of the microwave array antenna is WRFSignal, laserProviding an angular frequency of WoptIs upconverted to the optical domain by an array of electro-optic modulators. By analyzing the Lower Sideband (LSB) after electro-optical modulation, we can obtain the following relation:
wherein beta is the included angle between the equiphase plane of the emergent light beam at the tail end of the optical fiber and the vertical direction, D is the distance between adjacent microwave antennas, WRFIs the angular frequency of the received radio frequency signal. d is the distance between two fibers at the receiving end, WLSBThe angular frequency of the lower sideband signal. Theta is the included angle between the radio frequency signal wave front and the antenna plane.
To sum up, the different beams correspond to different frequencies and different incident angles, the microwave multi-beam optical receiving and demodulating system can be distinguished by reaching different positions of the photodetector array, and the compensated phase distribution is generated by the spatial light phase modulator so that the signal light is always converged at the corresponding position of the photodetector array, thereby realizing the multi-beam receiving and demodulating.
The invention has the beneficial effects that:
(1) the optical lens in the invention can process a plurality of beams, and the system is simple.
(2) The invention can receive the time agile wave beam and the multi-wave beam in real time and complete the photoelectric demodulation of the microwave information.
(3) The anti-interference capability is strong, and the compatibility is good.
Drawings
FIG. 1 is a schematic diagram of a microwave multi-beam optical receiving and demodulating system according to the present invention;
FIG. 2 is a schematic diagram of a microwave multi-beam optical receiving and demodulating system according to the present invention;
FIG. 3 is a diagram of a spectrum analysis of a microwave multi-beam optical receiving and demodulating system according to the present invention;
in the figure: 1, a microwave antenna array; 2 an array of electro-optic modulators; 3 a transmission fiber; 4 an optical antenna array; 5 an optical filter; 6 a spatial optical phase modulator; 7 an optical lens; 8, an optical beam splitter; 9 a photodetector array; 10 optical splitter; 11 a laser; 12 local oscillation light generating unit; 13 beam expanding and collimating lens.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention relates to a microwave multi-beam optical receiving and demodulating system which comprises an upper part and a lower part.
The upper part comprises a microwave antenna array 1, an electro-optic modulator array 2, a transmission optical fiber 3, an optical antenna array 4, an optical filter 5, a spatial optical phase modulator 6, an optical lens 7, an optical beam splitter 8 and a photoelectric detector array 9 from left to right in sequence; the microwave antenna array 1 is connected with the electro-optical modulator array 2 through a cable, the electro-optical modulator array 2 is connected with the optical antenna array 4 through a transmission optical fiber 3, the transmission optical fiber 3 realizes optical fiber zooming, meanwhile, consistency of channel loss and time delay can be guaranteed, and other parts needing to be connected are connected through optical fibers or optical cables. The optical antenna array 4, the optical filter 5, the spatial light phase modulator 6, the optical lens 7, the optical beam splitter 8 and the photoelectric detector array 9 need to be coaxial.
The lower part comprises an optical splitter 10, a laser 11, a local oscillator light generating unit 12 and a beam expanding collimating lens 13; the laser 11 is connected with the electro-optical modulator array 2 through an optical splitter 10, the laser 11, the local oscillator light generating unit 12 and the beam expanding collimating lens 13 are sequentially arranged from left to right, and the parts of the above components needing to be connected are all connected through optical fibers or optical cables. The laser 11 is connected with the electro-optical modulator array 2 through an optical splitter 10, and the laser 11, the local oscillator light generating unit 12 and the beam expanding collimating lens 13 are sequentially arranged from left to right. The beam expanding and collimating lens 13 and the optical beam splitter 8 need to be coaxial.
The working frequency bands of the microwave antenna array 1 and the electro-optical modulator array 2 of the system can cover S-Ka and millimeter wave frequency bands. The transmission optical fiber 3 routes the optical wave beam output by the electro-optical modulator array 2 to the optical antenna array 4; the optical antenna array 4 collimates the light wave beam output by the electro-optical modulator array 2; the optical filter 5 is used for filtering out sideband signals (for example, lower sidebands) carrying microwave echo beam information after passing through the optical antenna array 4; the signal light filtered by the optical filter 5 passes through the spatial light phase modulator 6, the spatial light phase modulator 6 performs phase modulation on the signal light, and the signal light is transmitted to the optical beam splitter 8 through the optical lens 7; focusing the signal light beam after phase modulation of the spatial light phase modulator 6 on a photoelectric detector array 9 through an optical lens 7 for optical heterodyne coherent beat frequency reception, wherein the spatial light phase modulator 6 generates compensated phase distribution by controlling the deflection of liquid crystal molecules so that the signal light is always converged at a corresponding position of the photoelectric detector array; the optical beam splitter 8 combines the signal light after two beams of light are respectively filtered by the optical filter 5 and the local oscillator light after beam expansion and collimation by the beam expansion and collimation lens 13 into a beam of light; the photoelectric detector array 9 realizes coherent beat frequency receiving of signal light and local oscillator light; the optical splitter 10 can divide one path of light into multiple paths of light and feed the light to the electro-optical modulator array 2 for optical modulation; the laser 11 provides an optical carrier signal for the electro-optical modulator array 2; the local oscillator light generating unit 12 provides a stable local oscillator light signal for receiving and demodulating the radio frequency signal; the beam expanding and collimating lens 13 expands the beam of the local oscillator optical signal and collimates the local oscillator optical signal into spatial light. The signal light passing through the optical filter 5 and the optical carrier required by the local oscillator light expanded and collimated by the expanded beam collimating lens 13 both come from the laser 11, so that good phase matching is ensured when two beams of light are combined to perform beat frequency, and the signal-to-noise ratio of the demodulated signal is ensured.
Further, the optical cables between the electro-optical modulator array 2 and the optical antenna array 4 are to maintain channel consistency.
Furthermore, the optical filter 5 needs a small 3dB bandwidth and a high roll-off degree, and realizes the extraction of a high-quality sideband signal.
Further, the difference between the frequency of the signal light filtered by the optical filter 5 and the frequency of the local oscillator light generated by the local oscillator light generating unit should not be greater than the cut-off frequency of the photodetector array 9.
Further, the stable local oscillator optical signal provided by the local oscillator optical generation unit 12 may be provided by a single-sideband injection locked distributed feedback laser, or may be provided by an optical phase-locked loop.
Examples
Fig. 2 is a block diagram of the structure of the microwave multi-beam optical receiving and demodulating system of the present invention. The use method of the system is as follows:
1) the frequency received by the microwave antenna array is fRF1Is transmitted to the electro-optical modulator array through the cable, and the electro-optical modulator array modulates the signal to the frequency f provided by the lasercOn the optical carrier. As shown in FIG. 3(a), the electro-optic modulator array output frequency is fcOptical carrier and first order sideband signal fc+fRF1And fc-fRF1And the optical carrier and the corresponding first-order optical sideband are transmitted in the multi-core optical cable with medium time delay. As shown in fig. 3(b), the frequency f is filtered by the filtercOptical carrier of frequency fc+fRF1Upper sideband with reserve frequency fc-fRF1The lower sideband of (a).
2) As shown in fig. 3(c), the local oscillation light generating unit generates a corresponding frequency fc-fRF2The light of (2); as shown in FIG. 3(d), the local oscillation light generating unit generates a frequency fc-fRF2The frequency of the light after being expanded and collimated by the expanding and collimating lens and filtered and output by the filter plate is fc-fRF1Light is mixed at a frequency fc-fRF1And fc-fRF2The mixed light beam has a difference frequency output frequency f through the photoelectric detector arrayRF1-fRF2Thus realizing the receiving demodulation of the radio frequency signal.
Different wave beams correspond to different frequencies and different incidence angles, the microwave multi-beam optical receiving and demodulating system can be distinguished by reaching different positions of the photoelectric detector array, and the compensated phase distribution is generated by the spatial light phase modulator so that the signal light is always converged at the corresponding position of the photoelectric detector array, thereby realizing the multi-beam receiving.
The above description is a more detailed description of the present invention in connection with preferred embodiments, and the specific embodiments of the present invention are not to be considered limited to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.
Claims (5)
1. A microwave multi-beam optical receiving and demodulating system is characterized by comprising an upper part and a lower part;
the upper part comprises a microwave antenna array (1), an electro-optic modulator array (2), a transmission optical fiber (3), an optical antenna array (4), an optical filter (5), a spatial optical phase modulator (6), an optical lens (7), an optical beam splitter (8) and a photoelectric detector array (9) from left to right in sequence; the microwave antenna array (1) is connected with the electro-optical modulator array (2) through a cable, the electro-optical modulator array (2) is connected with the optical antenna array (4) through a transmission optical fiber (3), and the rest parts are connected by optical fibers or optical cables; the optical antenna array (4), the optical filter (5), the spatial light phase modulator (6), the optical lens (7), the optical beam splitter (8) and the photoelectric detector array (9) ensure the coaxiality;
the lower part comprises an optical splitter (10), a laser (11), a local oscillator light generating unit (12) and a beam expanding collimating lens (13); the laser (11) is connected with the electro-optic modulator array (2) through an optical splitter (10), the laser (11), the local oscillator light generating unit (12) and the beam expanding collimating lens (13) are sequentially arranged from left to right, and the laser, the local oscillator light generating unit and the beam expanding collimating lens are connected through optical fibers or optical cables; the beam expanding and collimating lens (13) and the optical beam splitter (8) are ensured to be coaxial;
the working frequency bands of the microwave antenna array (1) and the electro-optical modulator array (2) of the system can cover S-Ka and millimeter wave frequency bands; the transmission optical fiber (3) routes the light wave beam output by the electro-optical modulator array (2) to the optical antenna array 4, and the optical antenna array 4 collimates the light wave beam output by the electro-optical modulator array (2); the optical filter (5) is used for filtering out sideband signals carrying microwave echo wave beam information after passing through the optical antenna array 4; the signal light filtered by the optical filter (5) is subjected to phase modulation by a space light phase modulator (6) and then transmitted to an optical beam splitter (8) by an optical lens (7); focusing the signal beam after phase modulation of the spatial light phase modulator (6) on a photoelectric detector array (9) through an optical lens (7) to perform optical heterodyne coherent beat frequency reception; the optical beam splitter (8) combines two beams of signal light respectively filtered by the optical filter (5) and the local oscillator light expanded and collimated by the beam expanding and collimating lens (13) into one beam of light; the photoelectric detector array (9) realizes coherent beat frequency receiving of signal light and local oscillator light; wherein, the signal light passing through the optical filter (5) and the optical carrier required by the local oscillator light expanded and collimated by the expanded beam collimating lens (13) come from the laser (11);
the optical splitter (10) can divide one path of light into multiple paths of light and feed the light to the electro-optical modulator array (2) for optical modulation; a laser (11) provides an optical carrier signal for the electro-optical modulator array (2); the local oscillator light generating unit (12) provides stable local oscillator optical signals for receiving and demodulating radio frequency signals; and the beam expanding and collimating lens (13) expands the beam of the local oscillator optical signal and collimates the local oscillator optical signal into space light.
2. A microwave multibeam optical receive demodulation system according to claim 1 wherein the optical cables between the electro-optic modulator array (2) and the optical antenna array 4 are to maintain channel consistency.
3. A microwave multibeam optical receiver demodulator system according to claim 1, wherein the difference in frequency between the signal light filtered out by said optical filter (5) and the local oscillator light generated by the local oscillator light generating unit is not greater than the cut-off frequency of the photodetector array (9).
4. The microwave multi-beam optical receive demodulation system according to claim 1, wherein the stable local optical signal provided by the local optical generation unit (12) can be provided by a single sideband injection locked distributed feedback laser or by an optical phase locked loop.
5. Use of a microwave multi-beam optical receive demodulation system according to any of claims 1 to 4, characterized in that it comprises the following steps:
the frequency received by the microwave antenna array (1)A rate of fRF1Is transmitted into the electro-optical modulator array (2) via a cable and modulated by the electro-optical modulator array (2) to a frequency f provided by a laser (11)cOn the optical carrier of (a); the output frequency of the electro-optical modulator array (2) is fcOptical carrier and first order sideband signal fc+fRF1And fc-fRF1The transmission is carried out with medium time delay in a multi-path transmission optical fiber (3); filtered out by an optical filter (5) with a frequency fcOptical carrier of frequency fc+fRF1Upper sideband with reserve frequency fc-fRF1The lower sideband of (a);
the local oscillation light generation unit (12) generates a frequency fc-fRF2The light is collimated by the beam expanding and collimating lens (13) and then filtered and output by the optical filter (5) with the frequency fc-fRF1Light is mixed at a frequency fc-fRF1And fc-fRF2The mixed light beam passes through a photoelectric detector array (9) and has a difference frequency output frequency fRF1-fRF2The receiving and demodulation of the radio frequency signal are realized.
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| CN114301534A (en) * | 2021-11-26 | 2022-04-08 | 军事科学院系统工程研究院网络信息研究所 | Method for realizing ultra-wideband chip integrated microwave photonic antenna |
| CN115037366A (en) * | 2022-06-20 | 2022-09-09 | 电子科技大学 | Laser multi-user full-duplex wireless optical communication system and method |
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