CN115664530A - Asymmetric non-precoding vector millimeter wave signal generation method - Google Patents
Asymmetric non-precoding vector millimeter wave signal generation method Download PDFInfo
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Abstract
The invention relates to the technical field of optical millimeter wave communication, in particular to a method for generating asymmetric non-precoded vector millimeter wave signals. The method comprises the following steps: mapping the PRBS to QPSK and low-pass filtering to generate vector data; dividing CW emission light into two channels and respectively injecting two PMs to respectively generate a multi-frequency optical sideband and realize modulation vector data optical sideband; controlling the RF amplitude; coupling optical signals of two PM outputs; selecting two photonic carriers based on an interleaver to avoid precoding; and obtaining the required quadruple frequency millimeter wave signal after square detection of the PD. The design of the invention is based on two phase modulators, has the advantages of simple structure, low cost, good signal quality and the like, enables vector signals to be only on one optical sideband, doubles the frequency when vector millimeter wave signals are generated by beat frequency, does not overlap phase information, can avoid the adoption of a precoding auxiliary technology, and further can select higher-order vector signals for modulation and carry out long-distance transmission.
Description
Technical Field
The invention relates to the technical field of optical millimeter wave communication, in particular to a method for generating an asymmetric vector millimeter wave signal without pre-coding.
Background
With the advent of the 5G era, various intelligent products and large data platforms are in a wide range, which has higher and higher requirements on data rate and capacity, and also has prompted the gradual development of data transmission modes towards wireless and broadband, and how to realize ultra-high-speed wireless signals has become a problem to be solved urgently. It is known that fiber optic communications can provide enormous transmission capacity and very long transmission distances, but are fixed in position and cannot completely cover any location. In an ideal situation, the wireless communication technology can cover all places, but because the frequency spectrum resources are not much, the wireless communication technology can be greatly damaged in the transmission process. Therefore, the transmission distance of the wireless communication technology is short, and the requirement of long-distance transmission cannot be met.
The optical millimeter wave communication technology has the advantages of optical fiber communication and wireless communication, and meets the requirements of future high-speed communication networks on communication bandwidth and mobility. In addition, the millimeter wave has abundant spectrum resources and has great potential in the aspects of wireless transmission capacity and transmission distance. It is the main bearer of 5G communications and next generation mobile communication networks. Today, with the increasing shortage of spectrum resources, it has attracted more and more attention from scientists and scholars. However, schemes that generate millimeter-wave signals based on conventional methods suffer from significant difficulties and challenges due to bandwidth limitations and other electronic bottlenecks.
To solve these problems, photon-assisted millimeter wave generation schemes using external modulators and frequency doubling techniques have been proposed. However, for some special signals, such as signals of modulation Quadrature Phase Shift Keying (QPSK), M-order quadrature amplitude modulation (M-QAM) or other high-order vector data, after square-law detection by a Photodetector (PD), the same multiplication factor occurs in the phase while frequency multiplication is achieved, which may cause phase disorder of the signals. The precoding auxiliary technology can be combined with a single intensity modulator or a phase modulator to generate the vector millimeter wave signal, and the cost is low. However, with the increase of the frequency multiplication factor of the vector millimeter wave or the modulation of a higher-order vector signal, the inverse operation of the phase and the amplitude by using the precoding auxiliary technology will result in the reduction of the distance between the constellation points in the constellation diagram of the signal at the transmitting end, and then the aliasing phenomenon will occur, so that in the transmission in the optical fiber, the influence on dispersion and noise will be more sensitive, the long-distance transmission cannot be performed, and due to the limitation of the bandwidth, the restoration will become extremely difficult. In view of the above, we propose an asymmetric non-precoded vector millimeter wave signal generation method.
Disclosure of Invention
The invention aims to provide an asymmetric non-precoded vector millimeter wave signal generation method to solve the problems in the background art.
In order to achieve the above-mentioned technical problem, an object of the present invention is to provide a method for generating a non-symmetric non-precoded vector millimeter wave signal, wherein only two phase modulations are used to generate an optical modulation, one of the two phase modulations is used to generate a quadrature phase shift keying modulated vector signal, and the other is used to generate an unmodulated harmonic signal, the method comprising the following steps:
s1, at a transmitting end, firstly mapping a fixed-length pseudorandom binary sequence to orthogonal phase shift keying and low-pass filtering to generate vector data, and then carrying out frequency conversion to a radio frequency band at a certain frequency;
s2, light emitted by the continuous laser is divided into two channels through a splitter, one channel generates a multi-frequency light sideband through injection phase modulation, and the other channel realizes modulation of a vector data light sideband through the other phase modulation;
s3, defining a phase modulation output light domain, and respectively calculating two phase modulation output light domains by controlling the amplitude of a radio frequency input signal;
s4, coupling the two optical signals output by the phase modulation at a coupler, and calculating an output optical domain of the coupled optical signals;
s5, selecting two photon carriers based on the interleaving multiplexer to avoid pre-coding; wherein two subcarriers need to be a photonic carrier modulation vector signal, the other is an optical unmodulated wavelet, and the modulated optical sideband needs to be a first-order optical sideband;
and S6, after square detection based on a photoelectric detector, a required quadruple frequency millimeter wave signal can be obtained.
As a further improvement of the technical solution, in step S1, the vector data is converted into a radio frequency band at a certain frequency, and the frequency at this time is set to be f 1 Then the rf vector signal can be expressed as:
V RF (t)＝V m Acos(2πf 1 t+φ) (1)；
wherein, V m Is the amplitude of the driving radio frequency signal source; a and phi respectively represent amplitude and phase information of the vector data symbol; t represents time;
the radio frequency vector information here is used to drive phase modulation.
Here, different types of transverse mode modulation formats may be used, such as quadrature phase shift keying QPSK, 8QAM, and 16 QAM.
At the same time, the frequency is f 1 May drive another phase modulation to achieve each order of unmodulated optical sidebands.
As a further improvement of the present technical solution, in step S2, the continuous light wave emitted by the continuous laser is defined as:
E in ＝E c exp(j2πf c t)；
wherein E c Representing the amplitude of the continuous laser, f c Indicating the frequency of the continuous laser.
As a further improvement of the present technical solution, in step S3, a light domain of the phase modulation output is defined as:
E PM (t)＝E in ·e(j·Δφ·modulation(t)) (2)；
wherein Δ φ is a phase difference; e is a constant; modulation (t) is the output signal of the radio frequency; the input signal of the radio frequency is normalized between 0 and 1;
furthermore, by controlling the amplitude of the rf input signal with the mach-zehnder modulator MZM, the two phased output optical domains can be described as:
wherein E is PM-1 、E PM-2 Respectively representing output optical domains for implementing modulation vector data optical sidebands and phase modulation for generating multi-frequency optical sidebands，J n (beta) is a first class of nth order Bessel function, beta 1 、β 2 Respectively representing the modulation coefficients of a mach-zehnder modulator MZM for controlling the amplitude of a radio frequency input signal driving two phase modulators.
As a further improvement of the present technical solution, in step S4, two optical signals output by two phase modulators are coupled at a coupler, and the optical domain of the coupled optical signal output may be described as:
wherein, E out For two output optical domains coupled by phase-modulated optical signals, E in Is a continuous light wave emitted by a continuous laser.
As a further improvement of the present technical solution, in the step S5, when two photonic carriers are selected based on the interleaver, it is assumed that the selected photonic carriers have a frequency interval of f 1 +nf 2 Then the output optical domain of the interleaver can be defined as:
wherein E is IL For interleaving the output optical domain of the multiplexer, E c Is the amplitude of the continuous laser.
As a further improvement of the technical solution, in step S6, a detailed process of obtaining the quadruple millimeter wave signal after square detection by the photodetector may be represented as:
where ζ represents the sensitivity of the photodetector, and the equation represents the acquisition of a high frequency 4 ω vector millimeter wave signal that is four times the rf source drive signal.
Another objective of the present invention is to provide a scheme architecture of an asymmetric non-precoded vector millimeter wave signal generation method, including: the system comprises a continuous laser CW, a splitter, a phase modulator and a phase modulator PM, wherein light emitted by the continuous laser CW is divided into two paths and respectively enters the two phase modulation PMs to be respectively used for generating a multi-frequency light sideband and for realizing modulation of a vector data light sideband; the method comprises the steps that a transmitting end maps a pseudo-random binary sequence PRBS to a quadrature phase shift keying QPSK and low-pass filtering to generate vector data, then the vector data are converted to a radio frequency RF frequency band and drive a phase modulation PM used for modulating an optical sideband of the vector data, meanwhile, another radio frequency RF drive phase modulation PM used for generating a multi-frequency optical sideband is generated through a Transmitter, and each radio frequency RF is provided with a Mach-Zehnder modulator MZM used for controlling the amplitude of a radio frequency RF input signal; the two phase-modulated PM optical signals are coupled at a coupler, sequentially pass through an Interleaver, an optical amplifier EDFA and a multimode fiber SSMF, and then pass through a photoelectric detector PD for beat frequency and square detection; the square detection adopts a digital signal processing DSP technology, a certain radio frequency RF driving optical signal is added firstly, then analog conversion is carried out through an analog-digital converter ADC, and finally Demodulation is carried out, so that the required vector millimeter wave signal is obtained.
The invention also provides a method operation control platform device, which comprises a processor, a memory and a computer program stored in the memory and run on the processor, wherein the processor is used for realizing the steps of the asymmetric non-precoded vector millimeter wave signal generation method when executing the computer program.
It is a fourth object of the present invention to provide a computer-readable storage medium, which stores a computer program, which when executed by a processor, implements the steps of the above-mentioned asymmetric non-precoded vector millimeter wave signal generation method.
Compared with the prior art, the invention has the beneficial effects that:
1. the asymmetric non-precoding vector millimeter wave signal generation method is based on two phase modulators, so that vector signals are only on one optical sideband, when vector millimeter wave signals are generated by beat frequency, the frequency is doubled, phase information is not overlapped, the adoption of precoding auxiliary technology can be avoided, higher-order vector signals can be selected for modulation, and long-distance transmission is carried out;
2. the asymmetric non-precoding vector millimeter wave signal generation method solves the problems that the existing vector millimeter wave generation method excessively depends on a precoding auxiliary technology and the precoding technology is invalid when a vector millimeter wave signal of high-frequency multiplication and high-order modulation is generated, and is suitable for current and future wireless and optical fiber communication systems;
3. compared with the prior art, the asymmetric non-precoding vector millimeter wave signal generation method only adopts two phase modulators and does not need precoding auxiliary technology, has the advantages of simple structure, low cost, good signal quality and the like, and is very suitable for being applied to the next generation radio over fiber and high-speed communication systems.
Drawings
Fig. 1 is a schematic diagram of an exemplary photon filtering-free scheme for generating quadruple frequency vector millimeter wave signals in the present invention, wherein (a), (b), (c), (d), and (e) are frequency spectrum diagrams of optical signal frequency fluctuations at five points a, b, c, d, and e in the schematic diagram;
fig. 2 is a frequency spectrum diagram of each position in an exemplary process of generating vector millimeter waves in the present invention, wherein (a) is an output frequency spectrum after passing through an external cavity laser; (b) outputting a frequency spectrum after PM-a; (c) outputting a frequency spectrum after PM-b; (d) is the optical coupler spectrum; (e) is an optical cross wavelength division multiplexer spectrum; (f) Outputting a frequency spectrum after receiving the QPSK vector millimeter wave signal after the PD is received;
FIG. 3 is a graph of bit error rate results versus photodetector input optical power for an example of the present invention;
FIG. 4 is a block diagram of an exemplary electronic computer platform assembly in accordance with the present invention.
In the figure:
CW, continuous lasers; splitter, shunt; transmitter, transmitter; PRBS, pseudo-random binary sequence; QPSK, quadrature phase shift keying; PM and phase modulation; RF, radio frequency; coupler, coupler; interleaver/IL, interleaver; EDFAs and optical amplifiers; SSMF, multimode fiber; PD, photodetector; DSP, digital signal processing; an ADC, an analog-to-digital converter; demodulation and Demodulation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Examples
As shown in fig. 1, the present embodiment provides an asymmetric non-precoded vector millimeter wave signal generating method, which uses only two phase-modulated PMs to generate optical modulation, one of which is used to generate a vector signal for quadrature phase shift keying QPSK modulation, and the other is used to generate an unmodulated harmonic signal, and includes the following steps:
s1, at a transmitting end, firstly, the fixed length is 2 16 -pseudo-random binary sequence PRBS of 1 is mapped to quadrature phase shift keying QPSK and low pass filtered to generate vector data, then at f 1 To the radio frequency RF band.
Specifically, the vector data is at f 1 After conversion to the RF frequency band, the RF vector signal can be expressed as:
V RF (t)＝V m Acos(2πf 1 t+φ) (1)；
wherein, V m Is the amplitude of the driving RF signal source; a and φ represent the amplitude and phase information of the vector data symbols, respectively; t represents time;
the radio frequency RF vector information here is used to drive the phase modulated PM.
Here, different types of transverse mode modulation formats may be used, such as quadrature phase shift keying QPSK, 8QAM, and 16 QAM.
At the same time, the frequency is f 1 Can drive another phase modulated PM, implementing unmodulated optical sidebands for each step.
S2, light emitted by the continuous laser CW is divided into two channels through a splitter, one channel generates a multi-frequency optical sideband through injecting phase modulation PM, and the other channel realizes modulation of a vector data optical sideband through passing through the other phase modulation PM.
In particular, the continuous light wave emitted by the continuous laser CW is defined as:
E in ＝E c exp(j2πf c t)；
wherein E c Representing the amplitude, f, of a continuous laser CW c Representing the frequency of the continuous laser CW.
And S3, defining the output optical domain of the phase modulation PM, and respectively calculating the output optical domains of the two phase modulation PMs by controlling the amplitude of a Radio Frequency (RF) input signal.
Specifically, the optical domain of the phase modulated PM output is defined as:
E PM (t)＝E in ·e(j·Δφ·modulation(t)) (2)；
wherein Δ φ is a phase difference; e is a constant; modulation (t) is the output signal of the radio frequency RF; the input signal of the radio frequency RF is normalized between 0 and 1;
furthermore, by controlling the amplitude of the RF input signal by the mach-zehnder modulator MZM, the output optical domains of the two phase modulated PMs can be described as:
wherein E is PM-1 、E PM-2 Respectively representing the output optical domains for implementing modulated vector data optical sidebands and phase modulated PMs for generating multi-frequency optical sidebands, J n (. Beta.) is of the first typeBessel function of order n, beta 1 、β 2 Respectively representing the modulation coefficients of a mach-zehnder modulator MZM for controlling the amplitude of a radio frequency RF input signal driving two phase modulated PMs.
And S4, coupling the optical signals output by the two phase modulation PMs at a coupler, and calculating the output optical domain of the coupled optical signals.
Specifically, in step S4, the optical signal output optical domain after the two optical signals output by the two phase modulation PMs are coupled at the coupler can be described as:
wherein E is out For two output domains of coupled phase-modulated PM optical signals, E in Is a continuous light wave emitted by a continuous laser CW.
S5, selecting two photon carriers based on the interleaving multiplexer IL to avoid precoding; where two subcarriers require one to modulate the vector signal for the photonic carrier and the other to be an optically unmodulated wavelet, and where the modulated optical sidebands must be first order optical sidebands.
Specifically, in step S5, when two photonic carriers are selected based on the interleaver IL, as shown in fig. 1 (d), the selected photonic carrier having a frequency interval of two is set as f 1 +nf 2 Then the output optical domain of the interleaver IL can be defined as:
wherein E is IL For interleaving the output light field of the multiplexer IL, E c Is the amplitude of the continuous laser CW.
And S6, after square detection based on the photoelectric detector PD, obtaining a required quadruple frequency millimeter wave signal.
Specifically, in step S6, the detailed process of obtaining the quadruple millimeter wave signal after the square detection of the photodetector PD can be represented as:
where ζ represents the sensitivity of the photodetector PD, and equation (7) represents the acquired high-frequency 4 ω vector millimeter wave signal, which is four times the RF source drive signal.
In summary, the invention provides a method for generating asymmetric non-precoded vector millimeter wave signals based on two phase modulators, which enables vector signals to be only on one optical sideband, frequency is doubled when vector millimeter wave signals are generated by beat frequency, phase information is not overlapped, the adoption of precoding auxiliary technology can be avoided, and higher-order vector signals can be selected for modulation and long-distance transmission. Furthermore, the method solves the problems that the prior vector millimeter wave generation method excessively depends on a precoding auxiliary technology and the precoding technology fails when the vector millimeter wave signal of high-frequency multiplication and high-order modulation is generated, and is suitable for the current and future wireless and optical fiber communication systems.
Validity verification
As shown in fig. 2 to fig. 3, in order to verify the feasibility of the above proposed solution, the present invention performs computer simulation based on real experimental environment parameters, and the specific verification process includes:
will have a length of 2 15 The pseudo-random binary sequence PRBS is mapped to the QPSK, and then the QPSK data is modulated to have the frequency f 1 A sinusoidal radio frequency source of =12 GHz. Various modulation formats can be adopted for the vector signals, such as quadrature phase shift keying QPSK/16PSK/16QAM and the like. As an example, the present solution only considers quadrature phase shift keying QPSK.
Continuous light was generated at 193.1THz using an external cavity laser ECL having a power of 20dBm and a linewidth of 100kHz as a light source, and an output spectrum of the external cavity laser ECL is shown in fig. 2 (a).
The converted vector signal is then used to drive a phase modulated PM to produce a multi-frequency tone with vector data, the spectrum of which is shown in fig. 2 (b).
Using a non-modulated sinusoidal radio frequency source f with frequency 2 The drive at =18GHz to another phase modulated PM produces multiple frequency optical harmonics without vector data, the spectrum of which is shown in fig. 2 (c).
The two branches of the multi-frequency optical sideband are combined by an optical coupler coupper as shown in fig. 2 (d).
The sum is then injected into the interleaver/interleaver IL, which can select two target optical sidebands, one being a modulated vector signal and the other being an unmodulated signal;
to generate a vector millimeter wave signal that does not require precoding, one optical tone needs to be selected from the ± 1st optical tones of the modulated vector signal and one optical tone needs to be selected from the unmodulated optical harmonics generated by the interleaver/interleaver IL.
Wherein, assuming that the two selected sidebands are modulated ± 1st optical tone and unmodulated-1 st optical carrier, an optical signal with a frequency interval of 30GHz (12 +18= 30ghz) can be obtained; if two side bands are selected as modulated +1st optical frequency and unmodulated-2 nd optical carrier, an optical signal with a frequency interval of 48GHz (12 +18 × 2= 48GHz) can be obtained; higher order non-modulated optical sidebands may be selected if it is desired to generate higher frequency vector millimeter wave signals.
As an example, we choose to modulate a ± 1st optical carrier and an unmodulated-3 rd optical carrier to achieve the generation of a mm-wave signal, where the frequency spacing of the optical signals is 66GHz (12 +18 × 3= 66ghz), as shown in fig. 2 (e).
Then, two target optical tones were transmitted on a 20km single-mode fiber SMF, in which the attention coefficient and the dispersion of the fiber were 0.2dB/km and 17ps/km/nm, respectively.
After the receiving end is subjected to square-law optical detection, two tones with a frequency spacing of 66GHz are directly converted into an electric v-band 66GHz vector millimeter wave signal, as shown in fig. 2 (f).
Furthermore, fig. 3 shows the relationship between the bit error rate curve and the input optical power of the photodetector/photodetector PD, including:
1) Back-to-back (BTB) transmission of 2-Gbaud QPSK modulated vector millimeter wave signals;
2) 10km Single Mode Fiber (SMF) transmission for 2-Gbaud QPSK modulated vector millimeter wave signals;
3) 20km Single Mode Fiber (SMF) transmission for 2-Gbaud QPSK modulated vector millimeter wave signals.
We may note that when the received optical power of the generated 2-Gbaud vector millimeter wave signal is greater than-13.07 dBm, where the bit error rate may be below the Forward Error Correction (FEC) threshold (3.8 x 10-3);
as transmission distance increases, signals are more sensitive to dispersion effects, so that the bit error rate of vector millimeter wave signals transmitted back-to-back (BTB) is more sensitive than signals transmitted by Single Mode Fiber (SMF) with a length of 10km/20 km.
As shown in fig. 1, this embodiment further provides a scheme architecture of an asymmetric non-precoded vector millimeter wave signal generation method, including: the system comprises a continuous laser CW, a splitter, a phase modulator and a phase modulator PM, wherein light emitted by the continuous laser CW is divided into two paths and respectively enters the two phase modulation PMs to be respectively used for generating a multi-frequency light sideband and for realizing modulation of a vector data light sideband; the method comprises the steps that a transmitting end maps a pseudo-random binary sequence PRBS to a quadrature phase shift keying QPSK and low-pass filtering to generate vector data, then the vector data are converted to a radio frequency RF frequency band and drive a phase modulation PM used for modulating an optical sideband of the vector data, meanwhile, another radio frequency RF drive phase modulation PM used for generating a multi-frequency optical sideband is generated through a Transmitter, and each radio frequency RF is provided with a Mach-Zehnder modulator MZM used for controlling the amplitude of a radio frequency RF input signal; the two phase-modulated PM optical signals are coupled at a coupler, sequentially pass through an Interleaver, an optical amplifier EDFA and a multimode fiber SSMF, and then pass through a photoelectric detector PD for beat frequency and square detection; the square detection adopts a digital signal processing DSP technology, a certain radio frequency RF driving optical signal is added firstly, then analog conversion is carried out through an analog-digital converter ADC, and finally Demodulation is carried out, so that the required vector millimeter wave signal is obtained.
As shown in fig. 4, the present embodiment further provides a method operation control platform device, which includes a processor, a memory, and a computer program stored in the memory and running on the processor.
The processor comprises one or more than one processing core, the processor is connected with the memory through the bus, the memory is used for storing program instructions, and the steps of the above-mentioned non-symmetric non-precoding vector millimeter wave signal generation method are realized when the processor executes the program instructions in the memory.
Alternatively, the memory may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
In addition, the present invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the above asymmetric non-precoded vector millimeter wave signal generation method.
Optionally, the present invention further provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the steps of the above-mentioned asymmetric non-precoded vector millimeter wave signal generation method in various aspects.
It will be understood by those skilled in the art that the process of implementing all or part of the steps of the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the preferred embodiments of the present invention are described above and in the specification only, and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.
Claims (7)
1. An asymmetric non-precoded vector millimeter wave signal generating method, characterized in that only two Phase Modulations (PM) are used to generate optical modulation, one of which is used to generate Quadrature Phase Shift Keying (QPSK) modulated vector signals and the other is used to generate unmodulated harmonic signals, comprising the steps of:
s1, at a transmitting end, firstly mapping a Pseudo Random Binary Sequence (PRBS) with a fixed length to a Quadrature Phase Shift Keying (QPSK) and low-pass filtering to generate vector data, and then carrying out frequency conversion to a Radio Frequency (RF) frequency band at a certain frequency;
s2, light emitted by a continuous laser (CW) is divided into two channels through a splitter (splitter), one channel generates a multi-frequency optical sideband through injection Phase Modulation (PM), and the other channel realizes modulation of a vector data optical sideband through the other Phase Modulation (PM);
s3, defining an optical domain of Phase Modulation (PM) output, and respectively calculating output optical domains of two Phase Modulations (PM) by controlling the amplitude of a Radio Frequency (RF) input signal;
s4, coupling the optical signals output by the two Phase Modulation (PM) at a coupler (coupler), and calculating the output optical domain of the coupled optical signals;
s5, selecting two photon carriers based on an interleaving multiplexer (IL) to avoid precoding; two subcarriers need to modulate vector signals for the photon carriers, the other one is an optical unmodulated wavelet, and the modulated optical sideband needs to be a first-order optical sideband;
and S6, after square detection based on a Photoelectric Detector (PD), obtaining a required quadruple frequency millimeter wave signal.
2. The asymmetric non-precoded vector millimeter wave signal generating method as claimed in claim 1, wherein in step S1, the vector data is converted to a Radio Frequency (RF) band at a certain frequency, and the frequency is f 1 Then the Radio Frequency (RF) vector signal can be expressed as:
V RF (t)＝V m Acos(2πf 1 t+φ) (1)；
wherein, V m Is the amplitude of the driving Radio Frequency (RF) signal source; a and φ represent the amplitude and phase information of the vector data symbols, respectively; t represents time;
the Radio Frequency (RF) vector information here is used to drive Phase Modulation (PM).
3. The asymmetric non-precoded vector millimeter wave signal generation method according to claim 2, wherein in said step S2, the continuous light wave emitted by the continuous laser (CW) is defined as:
E in ＝E c exp(j2πf c t)；
wherein E c Representing the amplitude, f, of a continuous laser (CW) c The frequency of the continuous laser (CW) is indicated.
4. The asymmetric non-precoded vector millimeter wave signal generation method according to claim 3, wherein in said step S3, the optical domain of the Phase Modulation (PM) output is defined as:
E PM (t)＝E in ·e(j·Δφ·modulation(t)) (2)；
wherein Δ φ is a phase difference; e is a constant; modulation (t) is the output signal of the Radio Frequency (RF); the input signal at Radio Frequency (RF) is normalized between 0 and 1;
furthermore, by controlling the amplitude of the Radio Frequency (RF) input signal by the mach-zehnder modulator MZM, the two Phase Modulated (PM) output optical domains can be described roughly as:
wherein, E PM-1 、E PM-2 Respectively representing the output optical domains for implementing modulated vector data optical sidebands and Phase Modulation (PM) for generating multi-frequency optical sidebands, J n (beta) is a first class of nth order Bessel function, beta 1 、β 2 Respectively representing the modulation coefficients of a mach-zehnder modulator MZM for controlling the amplitude of a Radio Frequency (RF) input signal driving two Phase Modulators (PMs).
5. The asymmetric non-precoded vector millimeter wave signal generating method according to claim 4, wherein in step S4, two optical signals outputted by two Phase Modulation (PM) are coupled at a coupler (coupler), and the output optical domain of the coupled optical signals can be described as:
wherein E is out For two output optical domains coupled by phase-modulated (PM) optical signals, E in Is a continuous light wave emitted by a continuous laser (CW).
6. The asymmetric non-precoded vector millimeter wave signal generation method as claimed in claim 5, wherein in said step S5, when two photonic carriers are selected based on the Interleaver (IL), the selected photonic carriers having a frequency interval of two are represented by f 1 +nf 2 The output optical domain of the Interleaver (IL) can then be defined as:
wherein E is IL For interleaving the output optical domain of the multiplexer (IL), E c Is the amplitude of a continuous laser (CW).
7. The asymmetric non-precoded vector millimeter wave signal generation method according to claim 6, wherein in step S6, the detailed process of obtaining the quadruple frequency millimeter wave signal after square detection by the Photodetector (PD) can be represented as:
where ζ represents the sensitivity of the Photodetector (PD), and equation (7) represents the acquisition of a high-frequency 4 ω vector millimeter wave signal that is four times the Radio Frequency (RF) source drive signal.
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2022
- 2022-10-24 CN CN202211302525.1A patent/CN115664530A/en active Pending
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