CN114050841A - Photo-generated six-frequency-multiplication phase coding microwave signal generation device and method - Google Patents
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Abstract
The invention discloses a device and a method for generating a photo-generated six-frequency-multiplication phase coding microwave signal.A laser emits a light wave which is modulated by a microwave signal through a parallel MZM modulator, the upper path signal and the lower path signal of the parallel modulator are added to generate a 2k + 1-order sideband, a modulation index m is set to enable the +/-1-order sideband to be zero, a phase shifter is adjusted to set the phase difference between MZM1 and MZM2 microwave driving signals to be pi/5, and the +/-3-order sideband is output; the microwave signal modulated by the data phase and the data signal subjected to gain are added to drive MZM1 and MZM2, and the modulation parameters of the electric phase modulator and the gain coefficient of the electric gain modulator are set, so that only one sideband of the optical carrier microwave signal carries data, and the phase of the sideband changes along with the data; and the positive 3-order sideband and the negative 3-order sideband of the receiving end generate a six-frequency-multiplication phase-coded microwave wave signal in the beat frequency of the photoelectric detector PD. Through the mode, the six-frequency-multiplication phase coding microwave signal is generated by only adopting a single parallel MZM modulator, and the requirements of modern radar or wireless communication on high carrier frequency, large bandwidth and wide tuning signal are met.
Description
Technical Field
The invention relates to the technical field of photoelectric signal processing methods, in particular to a method for generating a six-time frequency phase coding microwave signal by adopting an optical technology.
Background
Phase encoded microwave signals are signals commonly used in modern radar systems and wireless communications. Although the method for phase coding microwave signals by adopting the electronic technology is mature, the requirements of modern radar or wireless communication on high carrier frequency, large bandwidth and wide tuning signals are difficult to meet due to the limitation of 'electronic bottleneck'. The optical technology is adopted to generate the phase coding microwave signal, and the phase coding microwave signal has the advantages of high frequency, wide band, wide tuning range, electromagnetic interference avoidance, low transmission loss and the like.
With the rapid development of the information society, the working frequency of modern radar and wireless communication systems is developing toward high frequency. In recent years, W-band (75-110 GHz) and above frequency band radars are developed intensively and have unique advantages. Meanwhile, wireless communication in high-frequency bands such as a 60GHz band and a W band is rapidly developing. In these systems, high frequency broadband phase encoded microwave signals are favored.
In order to generate high frequency microwave signals at frequencies of 60GHz and above, the employed photo-generated microwave scheme requires a high multiplication factor, which also reduces the requirements on the modulator bandwidth and the frequency response of the microwave device. Methods for generating phase-encoded microwave signals in the optical domain have been reported as dual parallel polarization modulators + polarization modulators [ Optics Letters, 2014, 39(13): 3958-.
However, the above-described methods of optically phase encoding microwave signals suffer from several drawbacks. For example, the frequency multiplication factor of the microwave signals generated by the microwave signal generation device is frequency doubling or frequency quadrupling, and higher frequency phase coding microwave signals are difficult to generate; the above-mentioned systems generally employ a plurality of electro-optical modulators (including MZM modulators and polarization modulators), which results in a relatively complicated structure and high cost; other solutions also employ optical filters or fiber bragg gratings, which limit the frequency tuning range of the generated microwave signal and also reduce the stability of the system.
Disclosure of Invention
The invention mainly solves the technical problem of providing a device and a method for generating photo-generated six-frequency-multiplication phase coding microwave signals, which can generate the six-frequency-multiplication phase coding microwave signals only by adopting a single parallel MZM modulator, and meet the requirements of modern radar or wireless communication on high carrier frequency, large bandwidth and wide tuning signals.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a photo-generated frequency-six phase-coded microwave signal generating device, including: a laser, a microwave signal generator, an electric phase modulator, a phase shifter, an electric gain device, a parallel MZM modulator, a single-mode fiber and a photoelectric detector,
an optical wave emitted by a laser is modulated by a microwave signal carrying data through a parallel MZM modulator, the parallel modulator is composed of two sub-modulators MZM1 and MZM2, the two sub-modulators MZM1 and MZM2 are both biased on a minimum output point, the phase difference between two-arm microwave driving signals of each sub-modulator is pi, and the phase shifter is used for realizing the purpose;
the two paths of signals output by the upper arm and the lower arm of the parallel modulator are added to generate 2k +1 (k =0, +1, + 2 …) order sidebands mainly comprising +/-1, +3 and +/-5 order sidebands, wherein the amplitude of the +/-1 order sidebands is proportional to a first-order Bessel function J1(m), m is the modulation index of the parallel MZM modulator, set so that the amplitude is proportional to J1The + -1 order sidebands of (m) are zero,
adjusting the phase shifter to set the phase difference between the microwave driving signals of the two sub-modulators MZM1 and MZM2 to be pi/5, so that a plus or minus 5-order sideband is zero, and the output of the parallel MZM modulator is mainly a plus or minus 3-order sideband;
the microwave signal modulated by the data phase and the data signal with gain are added to drive the sub-modulator MZM1 and the sub-modulator MZM2, respectively, by setting the appropriate modulation parameter m of the electrical phase modulatorpAnd the gain coefficient g of the electric gain device can ensure that only one sideband (-3 order or +3 order) of the generated optical carrier microwave signal carries data, the phase of the sideband changes along with the data, and after the optical carrier microwave signal is transmitted by the single-mode optical fiber, the +3 order sideband and the-3 order sideband of a receiving end generate a six-frequency-multiplication phase coding microwave wave signal in the beat frequency of the photoelectric detector PD.
In a preferred embodiment of the present invention, the laser, the parallel modulator, the single-mode fiber and the photodetector are optically connected, and the microwave signal generator, the electrical phase modulator, the phase shifter and the electrical booster are electrically connected.
In a preferred embodiment of the invention, the parallel MZM modulator is a parallel mach-zehnder modulator MZM.
In a preferred embodiment of the present invention, the modulation index is set such that J1(m) has zero order ± 1 sidebands, where m = 3.8317.
In a preferred embodiment of the invention, the modulation parameter m of the electrical phase modulatorpThe gain factor g of the electric multiplier is set to g = 3mp。
In order to solve the technical problems, the invention adopts a technical scheme that: the method for generating the photo-generated six-frequency-multiplication phase coding microwave signal comprises the following steps of:
a. the light wave emitted by the laser is modulated by a microwave signal carrying data through a parallel MZM modulator, the parallel MZM modulator is composed of two sub-modulators MZM1 and MZM2, MZM1 and MZM2 are both biased on a minimum output point, the phase difference between two-arm microwave driving signals of each sub-modulator is pi, and the phase shifter is used for realizing,
the two paths of signals output by the upper arm and the lower arm of the parallel modulator are added to generate 2k +1 (k =0, +1, + 2 …) order sidebands which mainly comprise +/-1, +3 and +/-5 order sidebands, and the amplitudes of other high-order components are small and negligible;
b. by setting the appropriate MZM modulation index m, the amplitude is made proportional to a first order Bessel function J1The + -1 order sidebands of (m) are zero, i.e. J1(m) =0, adjusting the phase shifter to set the phase difference between the microwave driving signals of the two sub-modulators MZM1 and MZM2 to be pi/5, so that the +/-5 order sidebands are zero, and the output of the parallel modulator is mainly +/-3 order sidebands;
c. the microwave signal phase-modulated by the data and the data signal with gain are added to drive MZM1 and MZM2, respectively, by setting the appropriate modulation parameter m of the electrical phase modulatorpAnd the gain coefficient g of the electrical booster, so that the generated optical carrier can be minimizedOnly one sideband (-3 order or +3 order) of the wave signal carries data, the phase of the sideband changes along with the data, and after the transmission of the single-mode fiber, the positive 3 order sideband and the negative 3 order sideband of the receiving end generate a six-time frequency phase coding microwave signal in the beat frequency of the photoelectric detector PD;
the output light wave of the laser LD
Is frequency modulated by a parallel modulator
The microwave signal modulated by the data s (t) phase and the data signal modulated by the gain are added to drive the sub-modulator MZM1 and the sub-modulator MZM2 respectively, the phase difference of the driving signals between the two is pi/5, and the driving voltages of the MZM1 and the MZM2 are respectively pi/5
And
，
the upper and lower signals of the parallel modulator can be respectively expressed as:
in the formula (I), the compound is shown in the specification,
is the modulation index of the sub-modulators MZM1 and MZM2,
is the amplitude of the microwave signal and,
is the half-wave voltage of the sub-modulator, mpIs the modulation index of the electrical phase modulator, g is the gain factor of the electrical booster;
the output of the parallel modulator obtained by adding the upper and lower signals is:
the output is a sideband of order 2k +1 (k =0, ± 1, ± 2 …), and the MZM modulation index m is set such that J is adjusted1(m) =0, 1 order sideband can be eliminated, 5 order sideband is zero because the microwave driving signal phase difference of MZM1 and MZM2 is pi/5, (m) =0
) And the other odd-order components higher than 5 order have small and negligible amplitude, so the output of the parallel modulator can be simplified as follows:
setting the modulation index m of a suitable electrical phase modulatorpAnd the gain factor g of the electric booster (g =3 m)p) Then the output of the parallel MZM modulator is:
output frequencies of 3 respectively
And-3
Only the positive 3 th order sideband of (a), wherein only the positive 3 th order sideband carries data s (t), and the phase of the positive 3 th order sideband varies with the data s (t);
the photoelectric detector PD adopts square law detection, and beat frequency output of a positive 3-order sideband and a negative 3-order sideband is as follows:
wherein R is the responsivity of the PD, the PD outputting a microwave signal at a frequency of
In a phase of
Namely, a six-time frequency phase-coded microwave signal is generated.
In a preferred embodiment of the invention, the adjustment sets the MZM modulation index m such that J1(m) =0, where m = 3.8317.
The invention has the beneficial effects that:
(1) the invention adopts the optical technology to generate the high-frequency phase coding signal, breaks through the limitation of 'electronic bottleneck', and can meet the requirements of modern radar or wireless communication on high carrier frequency, large bandwidth and wide tuning signal;
(2) the invention can generate six-time frequency phase coding microwave signals, can reduce the requirements on the bandwidths of microwave devices and MZM modulators, for example, 60GHz microwave can be generated only by a 10GHz microwave signal generator and modulator, and the high-frequency microwave carrying phase information is a phase coding signal suitable for modern radar and wireless communication systems;
(3) the device has simple structure and low cost, only adopts a single parallel MZM modulator, does not need a plurality of photoelectric modulators, and can generate high-frequency microwave signals without an optical filter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a preferred embodiment of an apparatus and method for generating photo-generated frequency-hexagonally multiplied phase-coded microwave signals according to the present invention;
the parts in the drawings are numbered as follows: 1. the device comprises a laser, 2, a microwave signal generator, 3, an electric phase modulator, 4, a phase shifter, 5, an electric gain device, 6, a parallel MZM modulator, 7, a single-mode fiber, 8 and a photoelectric detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Referring to fig. 1, an embodiment of the present invention includes:
a photo-generated frequency-hexamultiplying phase-coded microwave signal generating device, comprising: a laser 1, a microwave signal generator 2, an electric phase modulator 3, a phase shifter 4, an electric gain 5, a parallel MZM modulator 6, a single-mode fiber 7 and a photodetector 8, wherein the parallel MZM modulator 6 may adopt a parallel mach-zehnder modulator MZM,
the laser 1, the parallel modulator 6, the single-mode fiber 7 and the photoelectric detector 8 are in optical connection, and the microwave signal generator 2, the electric phase modulator 3, the phase shifter 4 and the electric booster 5 are in electric connection.
A method for generating a photo-generated six-frequency-multiplication phase coding microwave signal comprises the following steps:
the light wave emitted by the laser 1LD is modulated by a microwave signal carrying data through a parallel MZM modulator 6, the parallel MZM modulator 6 is composed of two sub-modulators MZM1 and MZM2, MZM1 and MZM2 are both biased on a minimum output point, the phase difference between two-arm microwave driving signals of each sub-modulator is pi, and the phase shifter is used for realizing the phase difference.
The two paths of signals output by the upper arm and the lower arm of the parallel MZM modulator 6 are added to generate 2k +1 (k =0, + -1, + -2 …) order sidebands, which mainly comprise +/-1, + -3 and +/-5 order sidebands, and the amplitudes of other high-order components are small and negligible;
by setting a suitable MZM modulation index m, where m =3.8317, the amplitude is made proportional to a first order bessel function J1The + -1 order sidebands of (m) are zero, i.e. J1(m) = 0. the phase shifter 4 is adjusted to set the phase difference between the microwave drive signals of the two sub-modulators MZM1 and MZM2 to be pi/5, so that the ± 5 order sidebands are zero, and the output of the parallel MZM modulator 6 is mainly the ± 3 order sidebands.
The data phase modulated microwave signal and the gain data signal are added to drive MZM1 and MZM2, respectively, by setting the appropriate modulation parameter m of the electrical phase modulator 3pAnd the gain factor g of the electric booster 4 (g =3 m)p) The generated optical carrier microwave signal only has one sideband (-3 order or +3 order) to carry data, the phase of the sideband changes along with the data, and after the data is transmitted by the single-mode fiber 7, the positive 3 order sideband and the negative 3 order sideband of the receiving end generate a six-frequency-multiplication phase coding microwave signal in the beat frequency of the photoelectric detector PD.
The principle of generating the six-frequency-multiplication phase coding microwave signal comprises the following steps:
output light wave of laser 1LD
Is frequency-modulated into
The phase-modulated microwave signal and the gain data signal are added to drive the sub-modulators MZM1 and MZM2 respectively, the phase difference of the driving signals between the two is pi/5, and then the driving voltages of MZM1 and MZM2 are respectively pi/5
And
then, the upper and lower signals of the parallel MZM modulator 6 can be respectively expressed as:
in the formula (I), the compound is shown in the specification,
is the modulation index of the sub-modulators MZM1 and MZM2,
is the amplitude of the microwave signal and,
is the half-wave voltage of the sub-modulator, mpIs the modulation index of the electrical phase modulator 3, g is the gain factor of the electrical booster 5;
the output of the parallel MZM modulator 6 obtained by adding the upper and lower signals is:
the output is 2k +1 (k =0, ± 1, ± 2 …) order sidebands, and the MZM modulation index m is set to 3.8317, such that J1(m) =0, 1 order sideband can be eliminated, 5 order sideband is zero because the microwave driving signal phase difference of MZM1 and MZM2 is pi/5, (m) =0
) And the other odd-order components above 5 order have small and negligible amplitudes, the output of the parallel MZM modulator 6 can be simplified as follows:
setting the appropriate modulation index m of the electrical phase modulator 3pAnd a gain factor g of the electrical booster 5, such that g = 3mpThen the output of the parallel MZM modulator 6 is:
output frequencies of 3 respectively
And-3
Wherein only the positive 3 th order sideband carries data s (t), and the phase of the positive 3 th order sideband varies with the data s (t).
The photoelectric detector PD adopts square law detection, and beat frequency output of a positive 3-order sideband and a negative 3-order sideband is as follows:
wherein R is the responsivity of the PD, the PD outputting a microwave signal at a frequency of
In a phase of
Namely, a six-time frequency phase-coded microwave signal is generated.
The device and the method for generating the photo-generated six-frequency-multiplication phase coding microwave signal have the advantages that:
(1) the invention adopts the optical technology to generate the high-frequency phase coding signal, breaks through the limitation of 'electronic bottleneck', and can meet the requirements of modern radar or wireless communication on high carrier frequency, large bandwidth and wide tuning signal;
(2) the invention can generate six-time frequency phase coding microwave signals, can reduce the requirements on the bandwidths of microwave devices and MZM modulators, for example, 60GHz microwave can be generated only by a 10GHz microwave signal generator and modulator, and the high-frequency microwave carrying phase information is a phase coding signal suitable for modern radar and wireless communication systems;
(3) the device has simple structure and low cost, only adopts a single parallel MZM modulator, does not need a plurality of photoelectric modulators, and can generate high-frequency microwave signals without an optical filter.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A photo-generated frequency-six phase-coded microwave signal generating device, comprising: a laser, a microwave signal generator, an electric phase modulator, a phase shifter, an electric gain device, a parallel MZM modulator, a single-mode fiber and a photoelectric detector,
an optical wave emitted by a laser is modulated by a microwave signal carrying data through a parallel MZM modulator, the parallel modulator is composed of two sub-modulators MZM1 and MZM2, the two sub-modulators MZM1 and MZM2 are both biased on a minimum output point, the phase difference between two-arm microwave driving signals of each sub-modulator is pi, and the phase shifter is used for realizing the purpose;
the two paths of signals output by the upper arm and the lower arm of the parallel modulator are added to generate 2k +1 (k =0, +1, + 2 …) order sidebands mainly comprising +/-1, +3 and +/-5 order sidebands, wherein the amplitude of the +/-1 order sidebands is proportional to a first-order Bessel function J1(m), m is the modulation index of the parallel MZM modulator, set so that the amplitude is proportional to J1The + -1 order sidebands of (m) are zero,
adjusting the phase shifter to set the phase difference between the microwave driving signals of the two sub-modulators MZM1 and MZM2 to be pi/5, so that a plus or minus 5-order sideband is zero, and the output of the parallel MZM modulator is mainly a plus or minus 3-order sideband;
the microwave signal modulated by the data phase and the data signal with gain are added to drive the sub-modulator MZM1 and the sub-modulator MZM2, respectively, by setting the appropriate electrical phaseModulation parameter m of bit modulatorpAnd the gain coefficient g of the electric gain device can ensure that only one sideband (-3 order or +3 order) of the generated optical carrier microwave signal carries data, the phase of the sideband changes along with the data, and after the optical carrier microwave signal is transmitted by the single-mode optical fiber, the +3 order sideband and the-3 order sideband of a receiving end generate a six-frequency-multiplication phase coding microwave wave signal in the beat frequency of the photoelectric detector PD.
2. The apparatus according to claim 1, wherein the laser, the parallel modulator, the single-mode fiber and the photodetector are optically connected, and the microwave signal generator, the electrical phase modulator, the phase shifter and the electrical booster are electrically connected.
3. The apparatus of claim 1, wherein the parallel MZM modulator is a parallel mach-zehnder modulator MZM.
4. The apparatus according to claim 1, wherein said modulation index is set such that J is1(m) has zero order ± 1 sidebands, where m = 3.8317.
5. The apparatus according to claim 1, wherein the electrical phase modulator has a modulation parameter mpThe gain factor g of the electric multiplier is set to g = 3mp。
6. A method for generating a photo-generated frequency-hexagonally multiplied phase-encoded microwave signal, using the photo-generated frequency-hexagonally multiplied phase-encoded microwave signal generating apparatus of any one of claims 1-5, comprising the steps of:
a. the light wave emitted by the laser is modulated by a microwave signal carrying data through a parallel MZM modulator, the parallel MZM modulator is composed of two sub-modulators MZM1 and MZM2, MZM1 and MZM2 are both biased on a minimum output point, the phase difference between two-arm microwave driving signals of each sub-modulator is pi, and the phase shifter is used for realizing,
the two paths of signals output by the upper arm and the lower arm of the parallel modulator are added to generate 2k +1 (k =0, +1, + 2 …) order sidebands which mainly comprise +/-1, +3 and +/-5 order sidebands, and the amplitudes of other high-order components are small and negligible;
b. by setting the appropriate MZM modulation index m, the amplitude is made proportional to a first order Bessel function J1The + -1 order sidebands of (m) are zero, i.e. J1(m) =0, adjusting the phase shifter to set the phase difference between the microwave driving signals of the two sub-modulators MZM1 and MZM2 to be pi/5, so that the +/-5 order sidebands are zero, and the output of the parallel modulator is mainly +/-3 order sidebands;
c. the microwave signal phase-modulated by the data and the data signal with gain are added to drive MZM1 and MZM2, respectively, by setting the appropriate modulation parameter m of the electrical phase modulatorpAnd the gain coefficient g of the electric gain device can ensure that only one sideband (-3 order or +3 order) of the generated optical carrier microwave signal carries data, the phase of the sideband changes along with the data, and after the optical carrier microwave signal is transmitted by a single-mode optical fiber, the positive 3-order sideband and the negative 3-order sideband of the receiving end generate a six-frequency-multiplication phase coding microwave wave signal in the beat frequency of the photoelectric detector PD;
the output light wave of the laser LD is modulated by the parallel modulator to have a frequency of
The microwave signal modulated by the data s (t) phase and the data signal modulated by the gain are added to drive the sub-modulator MZM1 and the sub-modulator MZM2 respectively, the phase difference of the driving signals between the two is pi/5, and the driving voltages of the MZM1 and the MZM2 are respectively pi/5
And
，
the upper and lower signals of the parallel modulator can be respectively expressed as:
in the formula (I), the compound is shown in the specification,
is the modulation index of the sub-modulators MZM1 and MZM2,
is the amplitude of the microwave signal and,
is the half-wave voltage of the sub-modulator, mpIs the modulation index of the electrical phase modulator, g is the gain factor of the electrical booster;
the output of the parallel modulator obtained by adding the upper and lower signals is:
the output is a sideband of order 2k +1 (k =0, ± 1, ± 2 …), and the MZM modulation index m is set such that J is adjusted1(m) =0, 1 order sideband can be eliminated, 5 order sideband is zero because the microwave driving signal phase difference of MZM1 and MZM2 is pi/5, (m) =0
) And the other odd-order components higher than 5 order have small and negligible amplitude, so the output of the parallel modulator can be simplified as follows:
setting the modulation index m of a suitable electrical phase modulatorpAnd the gain factor g of the electric booster (g =3 m)p) Then the output of the parallel MZM modulator is:
output frequencies of 3 respectively
And-3
Only the positive 3 th order sideband of (a), wherein only the positive 3 th order sideband carries data s (t), and the phase of the positive 3 th order sideband varies with the data s (t);
the photoelectric detector PD adopts square law detection, and beat frequency output of a positive 3-order sideband and a negative 3-order sideband is as follows:
wherein R is the responsivity of the PD, the PD outputting a microwave signal at a frequency of
In a phase of
Namely, a six-time frequency phase-coded microwave signal is generated.
7. The method of claim 6, wherein said adjusting sets MZM modulation index m to J1(m) =0, where m = 3.8317.
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| CN111641460A (en) * | 2019-03-01 | 2020-09-08 | 西安电子科技大学 | Double-frequency triangular wave generation method for cascade connection of intensity modulator and polarization shunt multiplexing Mach-Zehnder modulator |
| CN110034824A (en) * | 2019-03-05 | 2019-07-19 | 常州工学院 | Inhibit the production method and its device of six times frequency optical millimeter waves of dispersive influence |
| CN110445542A (en) * | 2019-07-19 | 2019-11-12 | 常州工学院 | The 20 times frequency optical millimeter waves device and method based on nested Mach-Zehnder modulators |
| CN110958053A (en) * | 2019-11-29 | 2020-04-03 | 江苏南方通信科技有限公司 | Device and method for generating quad-frequency optical millimeter wave BPSK vector signal |
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