CN113507327B - Photon-assisted communication perception integrated device - Google Patents
Photon-assisted communication perception integrated device Download PDFInfo
- Publication number
- CN113507327B CN113507327B CN202111058686.6A CN202111058686A CN113507327B CN 113507327 B CN113507327 B CN 113507327B CN 202111058686 A CN202111058686 A CN 202111058686A CN 113507327 B CN113507327 B CN 113507327B
- Authority
- CN
- China
- Prior art keywords
- signal
- electro
- optical
- frequency
- chirp signal
- 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.)
- Active
Links
Images
Classifications
-
- 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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/86—Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/006—Devices for generating or processing an RF signal by optical means
Abstract
The invention provides a photon-assisted communication perception integrated device, which comprises: the device comprises a laser, an electric signal generator, an electro-optical modulator, a photoelectric detector and an antenna; the output end of the laser is connected with the first input end of the electro-optical modulator; the first output end of the electric signal generator is connected with the second input end of the electro-optical modulator; the second output end of the electric signal generator is connected with the third input end of the electro-optical modulator; the electric signal generator is used for generating a first chirp signal and a second chirp signal, and encoding the first chirp signal by using a baseband communication signal to generate a first encoded chirp signal; the output end of the electro-optical modulator is connected with the input end of the photoelectric detector; the output end of the photoelectric detector is connected with the input end of the antenna. The invention realizes the seamless integration of the radio-over-fiber communication and the photon radar transmitting system by simultaneously generating two paths of signals applied to the wireless communication and the radar system, and simplifies the structure of the system.
Description
Technical Field
The invention relates to the field of integration of radio over fiber communication and photon radar detection, in particular to a photon-assisted communication perception integrated device.
Background
With the rapid development of wireless communication technology, radar detection technology, artificial intelligence and other technologies, the commercial application of intelligent driving is gradually possible. Because the radar detection system and the wireless communication system have a lot of common points in the aspects of frequency range, transceiver structure and the like, the complex radar detection system and the wireless communication system are seamlessly integrated, the complexity and redundancy of the system can be simplified, the waste of space and software and hardware resources is reduced, and the electromagnetic interference between the two systems is avoided.
The existing photon-assisted communication perception integrated device is composed of three modules, wherein the first module is used for generating communication signals, the second module is used for generating phase coding or chirp radar signals, and the third module combines the two paths of signals together and transmits the signals out, so that the system structure is complex and the fusion is not thorough.
Disclosure of Invention
The invention provides a photon-assisted communication perception integrated device, which is used for overcoming the defects of complex system structure and incomplete fusion in the prior art and realizing the communication perception integrated device with a simple system structure.
The invention provides a photon-assisted communication perception integrated device, which comprises: the device comprises a laser, an electric signal generator, an electro-optical modulator, a photoelectric detector and an antenna;
the output end of the laser is connected with the first input end of the electro-optical modulator; the laser is used for generating continuous optical carriers;
the first output end of the electric signal generator is connected with the second input end of the electro-optical modulator; the second output end of the electric signal generator is connected with the third input end of the electro-optical modulator; the electrical signal generator is configured to generate a first chirp signal and a second chirp signal, and encode the first chirp signal using a baseband communication signal to generate a first encoded chirp signal;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector; the electro-optical modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first encoded chirp signal and the second chirp signal;
the output end of the photoelectric detector is connected with the input end of the antenna; the photoelectric detector is used for performing photoelectric conversion on the optical signal output by the electro-optical modulator;
the antenna is used for radiating the radio frequency signal generated by the photoelectric detector.
Optionally, the electro-optic modulator comprises a first sub-modulator and a second sub-modulator;
the first sub-modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first coded chirp signal;
the second sub-modulator is configured to perform electro-optical modulation on the continuous optical carrier by using the second chirp signal.
Optionally, the system further comprises a direct current power supply;
the direct current power supply is used for supplying power to the electro-optic modulator; and adjusting the direct current power supply to enable the electro-optic modulator to work at a minimum bias point.
Optionally, performing optical-to-electrical conversion on the optical signal output by the electro-optical modulator includes:
carrying out heterodyne beat frequency to carry out up-conversion on the baseband communication signal;
and carrying out heterodyne beat frequency to carry out frequency multiplication on the second chirp signal.
Optionally, the center frequency of the baseband communication signal after up-conversion is (f 1 +f 4 ) Wherein the first chirp signal and the second chirp signal have opposite chirp rates and the same time width,f 1 is an instantaneous frequency of the first chirp signal when T is equal to 0 or T is equal to T,f 4 is the instantaneous frequency of the second chirp signal when T equals 0 or T equals T, where T is the time width of the first chirp signal and T is the time.
Optionally, the relationship between the bandwidth of the baseband communication signal, the frequency of the first chirp signal, and the frequency of the second chirp signal is as follows:
in the formula (I), the compound is shown in the specification,
a bandwidth for a baseband communication signal;
of pulse-shaping filters for baseband communication signalsThe roll-off factor is a function of,
，
is the instantaneous frequency of the first chirp signal at T equal to T/2,
is the instantaneous frequency of the second chirp signal at T equal to T/2.
Optionally, the bandwidth of the frequency-multiplied second chirp signal is 2 × B, where B is the bandwidth of the second chirp signal.
Optionally, an optical filter is also included;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector through the optical filter;
the optical filter is used for filtering the optical signal output by the electro-optical modulator.
Optionally, a power amplifier is further included;
the output end of the photoelectric detector is connected with the input end of the antenna through the power amplifier;
the power amplifier is used for amplifying the power of the radio-frequency signal generated by the photoelectric detector.
Optionally, the laser is a single wavelength laser or a multi-wavelength laser.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a photon-assisted integrated communication sensing device according to an embodiment of the present invention;
fig. 2 is a time-frequency characteristic diagram of a dual chirp signal;
FIG. 3 is a diagram of the output spectrum of a single-laser dual-drive Mach-Zehnder modulator provided by an embodiment of the present invention;
FIG. 4 is a graph of the spectrum of a radio frequency signal generated by a photodetection according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of the integrated photon-assisted communication and sensing device according to the embodiment of the present invention;
FIG. 6 is a diagram of the output spectrum of a dual-wavelength laser dual-drive Mach-Zehnder modulator provided by an embodiment of the present invention;
fig. 7 is a graph illustrating a relationship between a bit error rate of a communication signal generated by the photodetection according to the embodiment of the present invention, a received optical power, and a constellation diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar elements and not for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more.
FIG. 1 is a schematic structural diagram of a photon-assisted integrated communication sensing device according to an embodiment of the present invention; as shown in fig. 1, the communication sensing integrated device provided in the embodiment of the present invention includes: the device comprises a laser, an electric signal generator, an electro-optical modulator, a photoelectric detector and an antenna;
the output end of the laser is connected with the first input end of the electro-optical modulator; the laser is used for generating continuous optical carriers;
the first output end of the electric signal generator is connected with the second input end of the electro-optical modulator; the second output end of the electric signal generator is connected with the third input end of the electro-optical modulator; the electrical signal generator is configured to generate a first chirp signal and a second chirp signal, and encode the first chirp signal using a baseband communication signal to generate a first encoded chirp signal;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector; the electro-optical modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first encoded chirp signal and the second chirp signal;
the output end of the photoelectric detector is connected with the input end of the antenna; the photoelectric detector is used for performing photoelectric conversion on the optical signal output by the electro-optical modulator;
the antenna is used for radiating the radio frequency signal generated by the photoelectric detector.
In particular, the laser generates a continuous optical carrier whose electric field can be represented as
Where A is the optical carrier amplitude, fcIs the optical carrier frequency. The continuous optical carrier generated by the laser is coupled into an electro-optic modulator.
Optionally, the laser is a single wavelength laser or a multi-wavelength laser. The single-wavelength laser is a laser for generating a continuous optical carrier, the multi-wavelength laser is preferably a dual-wavelength laser, and the dual-wavelength laser is a laser capable of generating two continuous optical carriers with a certain frequency difference. The following description will first take a single-wavelength laser as an example.
The chirp signal is preferably a double-chirp signal, and the double-chirp signal can overcome the distance-Doppler coupling effect brought by a single-chirp signal in the prior art and improve the accuracy of radar detection.
The electrical signal generator generates the first and second double chirp signals, but the manner in which the electrical signal generator generates the first and second double chirp signals is not particularly limited.
Denote the first double chirp signal as
The second double chirp signal is denoted as
The baseband communication signal is denoted as s (t), and the expression of the first encoded dual chirp signal generated by encoding the baseband communication signal is as follows:
wherein the content of the first and second substances,
is composed of
Is determined by the amplitude of the signal (c),
is composed of
Is determined by the amplitude of the signal (c),
when T is equal to 0 or T is equal to T
The instantaneous frequency of the frequency of,
when T is equal to T/2
The instantaneous frequency of (d);
when T is equal to 0 or T is equal to T
The instantaneous frequency of the frequency of,
when T is equal to T/2
The instantaneous frequency of (d); t represents the time width of the dual chirp signal,
representing the bandwidth of the dual chirp signal, k is the chirp rate and t is the time.
The electrical signal generator inputs the first coded double-chirp signal and the second double-chirp signal into the electro-optic modulator, the electro-optic modulator modulates the first coded double-chirp signal and the second double-chirp signal onto an optical carrier, so that an optical parameter changes along with the change of the electrical parameter, and the input electrical signal can modulate parameters such as amplitude, frequency and phase of an optical field.
In small signal modulation, the optical field output by the electro-optical modulatorEThe expression of (a) is as follows:
in the formula (I), the compound is shown in the specification,
to electro-optically modulate the modulation factor of the neutron modulator,
the expression of (a) is as follows:
wherein the content of the first and second substances,
is the half-wave voltage of the electro-optic modulator.
The optical signal output by the electro-optical modulator is input into a photoelectric detector for photoelectric conversion, and the photoelectric detector performs photoelectric conversion to generate an electric field of a radio-frequency signalIThe expression of (a) is as follows:
wherein the content of the first and second substances,conj(E)is composed ofEThe complex conjugate of (a).
And then, inputting radio-frequency signals generated by photoelectric conversion of the photoelectric detector into the antenna, wherein direct-current components and other frequency components exceeding the bandwidth of the antenna are filtered due to the bandwidth limitation of the antenna, and the radio-frequency signals generated by the photoelectric detector are radiated out after being filtered by the antenna.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system.
Optionally, the electro-optic modulator comprises a first sub-modulator and a second sub-modulator;
the first sub-modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first coded chirp signal;
the second sub-modulator is configured to perform electro-optical modulation on the continuous optical carrier by using the second chirp signal.
Specifically, the electro-optical modulator of the present application has two sub-modulators, a first sub-modulator for electro-optically modulating a continuous optical carrier with a first encoded double chirp signal, and a second sub-modulator for electro-optically modulating the continuous optical carrier with a second double chirp signal.
The electro-optic Modulator may be a Dual-Drive Mach-Zehnder Modulator (DMZM) or a Dual-parallel Mach-Zehnder Modulator (DPMZM), which is described below with reference to DMZM as an example.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system; two paths of modulation are respectively carried out by using two sub-modulators of the electro-optical modulator, so that the space of the device is saved, the complexity and the cost of the system are reduced, and the stability of the system is improved.
Optionally, the system further comprises a direct current power supply;
the direct current power supply is used for supplying power to the electro-optic modulator; and adjusting the direct current power supply to enable the electro-optic modulator to work at a minimum bias point.
Specifically, the electrical signal generators will each be
And
the two paths of electric signals are simultaneously modulated to an optical carrier generated by a laser, and the output voltage of a direct current power supply is adjusted to enable the DMZM to work at a minimum offset point, wherein the minimum offset point is a phase difference pi introduced by the optical carrier passing through two sub-modulators in an electro-optical modulator.
Fig. 3 is a spectrum diagram of the output of the single-laser dual-drive mach-zehnder modulator provided in the embodiment of the present invention, and the frequency value shown in fig. 3 is a frequency relative to the optical carrier. In fig. 3, the bandwidths of two dual chirp signals loaded on DMZM
Equal to the frequency of 2GHz,
equal to the frequency of 2GHz,
equal to 14GHz, bandwidth of baseband communication signals
Equal to 1.5 GHz. Optical field output from electro-optic modulatorEAs can be seen from the expression and fig. 3, DMZM employs minimum bias point modulation to suppress optical carriers, thereby reducing the unwanted optical power entering the photodetector, and further improving the receiving sensitivity of the photodetectorAnd (4) degree.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to a radar system and wireless communication, thereby simplifying the structure of the system; the electro-optical modulator works at the minimum bias point by adjusting the direct-current power supply, and the suppression of optical carriers can be realized, so that the useless optical power entering the photoelectric detector is reduced, and the receiving sensitivity of the photoelectric detector can be improved.
Optionally, performing optical-to-electrical conversion on the optical signal output by the electro-optical modulator includes:
carrying out heterodyne beat frequency to carry out up-conversion on the baseband communication signal;
and carrying out heterodyne beat frequency to carry out frequency multiplication on the second chirp signal.
Specifically, the process of performing photoelectric conversion on the optical signal output by the electro-optical modulator by the photodetector includes a process of performing up-conversion on the baseband communication signal by heterodyne beat frequency and performing frequency multiplication on the second double chirp signal.
The signal radiated by the antenna is transmitted through a wireless channel, and the baseband communication signal is up-convertedI commu The user terminal receives the downlink communication to realize the downlink communication; at the same time, the second double chirp signal after frequency multiplicationI sensing After reaching the detected target, the reflected signal is reflected to generate an echo signal so as to obtain the perception information of the distance, the speed and the like of the detected target.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to a radar system and wireless communication, thereby simplifying the structure of the system; the up-conversion is carried out on the baseband communication signal through heterodyne beat frequency, and the method can be used for wireless communication; the baseband communication signals are not limited to low-order modulation formats such as On-Off Keying (OOK), Amplitude Shift Keying (ASK) and the like, and are not influenced by radar signals, so that high wireless communication speed and system sensitivity can be ensured; the carrier frequency and the bandwidth of the sensing signal are doubled through photon frequency doubling, the speed resolution and the distance resolution of radar detection are effectively improved, and the probability of signal interception and the interference to other electromagnetic frequency bands can be reduced.
Optionally, the center frequency of the baseband communication signal after up-conversion is (f 1 +f 4 ) Wherein the first chirp signal and the second chirp signal have opposite chirp rates and the same time width,f 1 is an instantaneous frequency of the first chirp signal when T is equal to 0 or T is equal to T,f 4 is the instantaneous frequency of the second chirp signal when T equals 0 or T equals T, where T is the time width of the first chirp signal and T is the time.
In particular, in the electric fieldIIn the expression (c), the third term is the electric field after up-conversion of the baseband communication signal, which is denoted as I 2And finishing to obtainI 2The expression is as follows:
byI 2As can be seen from the expression (c), the center frequency of the baseband communication signal is up-converted to
And
(ii) a Wherein the center frequency is
The signal of (2) can be used for wireless communication to realize downlink transmission of user information.
Due to the fact that the carrier frequency is high, and the format of the baseband communication signal is not limited to low-order modulation formats such as OOK and ASK, and is not affected by radar signals, for example: phase-sensitive four-level Pulse Amplitude Modulation (PAM 4), so that the downstream rate of information can be guaranteed.
According toE、IAndI 2the spectrum of the radio frequency signal generated by the photodetector is shown in fig. 4, given the parameters given in fig. 3. As can be seen from fig. 4, the up-converted baseband communication signalI commu Center frequency of
Is 16 GHz.
According to the IEEE 521-2002 standard, the Ku wave frequency range is 12-18GHz and is a common wave band for satellite communication; the frequency range of the K wave band is 18-27GHz, and the K wave band is widely applied to radar communication. On one hand, under the constraint of the given frequency in fig. 4, the center frequency of the up-converted signal is 16GHz, and is located in the Ku band range, so that the up-converted signal can be used for satellite communication; on the other hand, by setting different frequencies, the system can work in frequency bands of different application types, thereby realizing flexible application of the system.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system; the heterodyne beat frequency is used for up-converting the baseband communication signals, can be used for wireless communication, and ensures higher wireless communication rate and system sensitivity.
Optionally, the relational expression between the bandwidth of the baseband communication signal, the frequency of the first chirp signal, and the frequency of the second chirp signal is as follows:
in the formula (I), the compound is shown in the specification,
a bandwidth for a baseband communication signal;
roll-off factor for pulse shaping filters for baseband communication signalsIn the case of a hybrid vehicle,
，
is the instantaneous frequency of the first chirp signal at T equal to T/2,
is the instantaneous frequency of the second chirp signal at T equal to T/2.
In particular, bandwidth of baseband communication signals
With a first double chirp signal
And
and a second double chirp signal
And
should be restricted from each other to prevent radio frequency signalsIThe other frequency components and the second double chirp signal after frequency multiplicationI sensing And up-converted baseband communication signalsI commu Spectral aliasing occurs, andI sensing andI commu spectral aliasing occurs in between.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system; the bandwidth of the baseband communication signal and the frequency of the double chirp signal are limited, and the occurrence of frequency spectrum aliasing is prevented.
Optionally, the bandwidth of the frequency-multiplied second chirp signal is 2 × B, where B is the bandwidth of the second chirp signal.
In particular, the electric fieldIThe second term in the expression of (a) is embodied as LFM2(t) electric field of the new chirp signal obtained after frequency multiplication, which is recorded asI 1And is unfolded to obtainI 1The expression of (a) is as follows:
byI 1The expression of (2) shows that the generated frequency doubling chirp signal is still a double chirp signal, the double chirp signal contains an up-chirp waveform and a down-chirp waveform with the same bandwidth in the same pulse time period, and the distance-Doppler coupling effect generated when the single chirp signal is used for measuring a high-speed object can be eliminated; and the carrier frequency and bandwidth of the generated frequency-doubled double chirp signal: (
) Is the second chirp signal LFM2(t) carrier frequency and bandwidth: (
) Twice as much.
The center frequency and the bandwidth of the double chirp signal after frequency multiplication are LFM2(t) to increase the speed resolution and range resolution of the detection; in addition, because the bandwidth of the double chirp signal after frequency multiplication is increased, the energy is dispersed in a larger bandwidth, and when the working distance or the coverage range is kept constant, the power spectral density of the required transmitted signal is reduced, so that the probability of signal interception and the interference to other electromagnetic frequency bands can be reduced.
As can be seen from fig. 4, the frequency-multiplied second chirp signalI sensing Is in the range of 24-28GHz, whereas the frequency range of vehicle radar-related applications is in the range of 24.25-26.65 GHz. Therefore, the frequency-doubled chirp signal can be applied to vehicle-mounted radar and other related applications.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to a radar system and wireless communication, thereby simplifying the structure of the system; the carrier frequency and the bandwidth of the sensing signal are doubled through photon frequency doubling, the speed resolution and the distance resolution of radar detection are effectively improved, and the probability of signal interception and the interference to other electromagnetic frequency bands can be reduced.
Optionally, an optical filter is also included;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector through the optical filter;
the optical filter is used for filtering the optical signal output by the electro-optical modulator.
Specifically, fig. 5 is a second schematic structural diagram of the integrated communication and sensing device according to the embodiment of the present invention, and as shown in fig. 5, the integrated communication and sensing device according to the embodiment of the present invention further includes an optical filter.
The optical signal output by the electro-optical modulator is filtered by the optical filter and then input into the photoelectric detector for photoelectric conversion.
When the laser is a single-wavelength laser, the optical filter only filters out optical signal out-of-band noise of the optical signal output by the DMZM, and does not inhibit an optical sideband generated by the DMZM.
When the laser is a dual-wavelength laser, the optical filter carries out filtering processing on the optical signal output by the DMZM, and a first sideband, a second sideband and a third sideband are filtered out. With a dual wavelength laser, the baseband communication signal may be up-converted to a higher frequency while the second chirp signal is frequency doubled to a higher frequency.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system; the optical filter is used for filtering the optical signal output by the electro-optical modulator, so that out-of-band noise can be filtered out, and a required optical sideband can be filtered out.
Optionally, a power amplifier is further included;
the output end of the photoelectric detector is connected with the input end of the antenna through the power amplifier;
the power amplifier is used for amplifying the power of the radio-frequency signal generated by the photoelectric detector.
Specifically, fig. 5 is a second schematic structural diagram of the integrated communication and sensing device according to the embodiment of the present invention, and as shown in fig. 5, the integrated communication and sensing device according to the embodiment of the present invention further includes a power amplifier.
When the power of the radio-frequency signal output by the photoelectric detector is not large enough, a power amplifier can be connected behind the photoelectric detector, and the radio-frequency signal output by the photoelectric detector is subjected to power amplification by the power amplifier and then input into the antenna for radiation.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to wireless communication and a radar system, thereby simplifying the structure of the system; the power amplifier is used for amplifying the power of the radio-frequency signal generated by the photoelectric detector, and the wireless transmission distance is increased.
Fig. 6 is a spectrogram of an output of the dual-wavelength laser dual-drive mach-zehnder modulator provided in the embodiment of the present invention, where the frequency difference between the two lasers is set to 50GHz, and other parameters are kept consistent with those in fig. 3, so as to obtain the spectrogram shown in fig. 6. As can be seen from fig. 3 and 6, the wireless communication signal and the sensing signal generated by the embodiment using the dual-wavelength laser may have a higher frequency and more flexible frequency tunability than the embodiment using the single laser.
Fig. 7 is a diagram illustrating a relationship between a Bit Error Rate (BER) of a communication signal generated by the photodetection, a Received Optical Power (ROP), and a constellation diagram, wherein a baseband communication data format is phase-sensitive PAM 4. As can be seen from fig. 7, the communication system has good reception sensitivity.
The photon-assisted communication perception integrated device provided by the invention can realize seamless fusion of radio-over-fiber communication and a photon radar transmitting system by simultaneously generating two paths of signals applied to a radar system and wireless communication, thereby simplifying the structure of the system; wireless communication signals and sensing signals with higher frequencies and more flexible frequency tunability are generated using dual-wavelength lasers.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A photon-assisted integrated communication-aware apparatus, comprising: the device comprises a laser, an electric signal generator, an electro-optical modulator, a photoelectric detector and an antenna;
the output end of the laser is connected with the first input end of the electro-optical modulator; the laser is used for generating continuous optical carriers;
the first output end of the electric signal generator is connected with the second input end of the electro-optical modulator; the second output end of the electric signal generator is connected with the third input end of the electro-optical modulator; the electrical signal generator is configured to generate a first chirp signal and a second chirp signal, and encode the first chirp signal using a baseband communication signal to generate a first encoded chirp signal;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector; the electro-optical modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first encoded chirp signal and the second chirp signal;
the output end of the photoelectric detector is connected with the input end of the antenna; the photoelectric detector is used for performing photoelectric conversion on the optical signal output by the electro-optical modulator;
the antenna is used for radiating the radio frequency signal generated by the photoelectric detector;
performing photoelectric conversion on an optical signal output by the electro-optical modulator, including:
carrying out heterodyne beat frequency to carry out up-conversion on the baseband communication signal;
the center frequency of the baseband communication signal after up-conversion is (f 1 +f 4 ) Wherein the first chirp signal and the second chirp signal have opposite chirp rates and the same time width,f 1 is an instantaneous frequency of the first chirp signal when T is equal to 0 or T is equal to T,f 4 is the instantaneous frequency of the second chirp signal when T equals 0 or T equals T, where T is the time width of the first chirp signal and T is the time.
2. The photon-assisted, integrated communication-aware device of claim 1, wherein the electro-optic modulator comprises a first sub-modulator and a second sub-modulator;
the first sub-modulator is used for electro-optically modulating the continuous optical carrier by utilizing the first coded chirp signal;
the second sub-modulator is configured to perform electro-optical modulation on the continuous optical carrier by using the second chirp signal.
3. The integrated photon-assisted communication-aware device of claim 1, further comprising a dc power supply;
the direct current power supply is used for supplying power to the electro-optic modulator; and adjusting the direct current power supply to enable the electro-optic modulator to work at a minimum bias point.
4. The integrated photon-assisted communication-aware device of claim 1, wherein the optical signal output by the electro-optical modulator is photo-electrically converted, further comprising:
and carrying out heterodyne beat frequency to carry out frequency multiplication on the second chirp signal.
5. The photonic-assisted communication-aware integrated apparatus of claim 1, wherein the relationship between the bandwidth of the baseband communication signal, the frequency of the first chirp signal, and the frequency of the second chirp signal is as follows:
in the formula (I), the compound is shown in the specification,
a bandwidth for a baseband communication signal;
the roll-off factor of the pulse shaping filter for the baseband communication signal,
，
is the instantaneous frequency of the first chirp signal at T equal to T/2,
is the instantaneous frequency of the second chirp signal at T equal to T/2.
6. The integrated photon-assisted communication-aware device according to claim 4, wherein the second frequency-multiplied chirp signal has a bandwidth of 2 × B, where B is the bandwidth of the second chirp signal.
7. The integrated photon-assisted communication-aware device of claim 1, further comprising an optical filter;
the output end of the electro-optical modulator is connected with the input end of the photoelectric detector through the optical filter;
the optical filter is used for filtering the optical signal output by the electro-optical modulator.
8. The integrated photon-assisted communication-aware device of claim 1, further comprising a power amplifier;
the output end of the photoelectric detector is connected with the input end of the antenna through the power amplifier;
the power amplifier is used for amplifying the power of the radio-frequency signal generated by the photoelectric detector.
9. The integrated photon-assisted communication-aware device of claim 1, wherein the laser is a single-wavelength laser or a multi-wavelength laser.
10. The integrated photon-assisted communication-aware apparatus of claim 1, wherein the first and second chirp signals are both dual chirp signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111058686.6A CN113507327B (en) | 2021-09-10 | 2021-09-10 | Photon-assisted communication perception integrated device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111058686.6A CN113507327B (en) | 2021-09-10 | 2021-09-10 | Photon-assisted communication perception integrated device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113507327A CN113507327A (en) | 2021-10-15 |
| CN113507327B true CN113507327B (en) | 2021-12-28 |
Family
ID=78016571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111058686.6A Active CN113507327B (en) | 2021-09-10 | 2021-09-10 | Photon-assisted communication perception integrated device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113507327B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932691B (en) * | 2019-03-27 | 2020-07-10 | 南京航空航天大学 | Microwave photon radar-communication integrated method and device |
| CN110632597B (en) * | 2019-10-14 | 2022-01-07 | 南京航空航天大学 | Microwave photon inverse synthetic aperture radar imaging method and device |
| CN112034444B (en) * | 2020-08-25 | 2022-11-18 | 西安电子科技大学 | Multi-beam radar communication integration method based on cyclic coding array |
| CN112578379A (en) * | 2020-11-27 | 2021-03-30 | 南京航空航天大学 | Photon-assisted pulse system microwave radar detection method and device |
-
2021
- 2021-09-10 CN CN202111058686.6A patent/CN113507327B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113507327A (en) | 2021-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111538028B (en) | Polarization multiplexing microwave photon radar detection method and system based on photon sampling | |
| JP3981337B2 (en) | Optical fiber-radio mixed communication apparatus and method | |
| US20230136882A1 (en) | Coherent microwave photonics radar detection method and system based on injection locking frequency multiplication | |
| US8923702B2 (en) | Signal receiving method based on microwave photonics technologies | |
| US6556327B1 (en) | Signal converter, optical transmitter and optical fiber transmission system | |
| CN112152720B (en) | Multi-frequency-band double-chirp microwave signal generation and optical fiber dispersion resistant transmission system and method | |
| CN109143203B (en) | Polarization multiplexing-based optical frequency multiplication microwave photon coherent radar transmitting and receiving device and method | |
| CN110221292B (en) | Microwave photon multiband radar imaging system and method | |
| CN115032611B (en) | Distributed terahertz radar detection system and method based on photon technology | |
| CN101674136B (en) | Optical frequency-doubling millimeter wave RoF signal generation system and method of OFDM modulation mode | |
| CN111464240A (en) | Vector radio frequency signal generation system based on polarization multiplexing intensity modulator | |
| CN115184943A (en) | Terahertz radar detection method and system based on photon technology | |
| CN115865208A (en) | Millimeter wave communication perception integrated transmission system based on LFM-OFDM signal | |
| CN113114380B (en) | Microwave photon radar detection method and system based on photon sampling and coherent reception | |
| CN113114375B (en) | Photon terahertz communication method and device | |
| CN111917475B (en) | System for simultaneously providing wired and single side band wireless services based on single modulator | |
| CN113507327B (en) | Photon-assisted communication perception integrated device | |
| CN111965915A (en) | Terahertz wave signal generation system and method based on optical frequency comb | |
| CN114614841B (en) | Photonic millimeter wave radar communication integrated system based on analog phase modulation | |
| CN116626693A (en) | Coherent microwave photon radar detection method and system based on photon frequency multiplication | |
| CN113608227B (en) | Photon-assisted radar mixing and direct wave self-interference cancellation integrated device and method | |
| CN111752064A (en) | Phase-adjustable imaginary part down-conversion suppression device and method | |
| CN111224720B (en) | Terahertz vector signal generation system and method of cascade connection of dual-intensity modulator | |
| CN113489551A (en) | Centimeter wave/millimeter wave ultra-wideband signal generating device | |
| CN113452452B (en) | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |