CN114301538A - Phase coding signal generation system and method based on DOMZM - Google Patents
Phase coding signal generation system and method based on DOMZM Download PDFInfo
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Abstract
The invention relates to a phase coding signal generation system based on a DOMZM.A laser light source is connected with the input end of a double-output Mach-Zehnder adjuster, and the double-output Mach-Zehnder adjuster is provided with two complementary output ends which are respectively connected with a first optical switch and a second optical switch; the code pattern signal generator is respectively connected with the first optical switch and the second optical switch and controls the two optical switches to switch on-off states; the radio frequency signal generator is connected with the double-output Mach-Zehnder modulator; the output ends of the first optical switch and the second optical switch are coupled by the coupler and then connected with the photoelectric detector. The system can multiply the frequency of the radio frequency signal to generate a double-frequency phase coding signal; the tunable frequency range is large; the whole system has no wavelength related device, and the whole structure is simple; only the code pattern signal generator is needed to control the on-off of the optical switch, and a power control element is not needed, so that the system structure is further simplified.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a phase coding signal generation system and method based on a DOMZM.
Background
The generation of the phase-coded signal is of great significance for improving the range resolution and the speed resolution of the radar, and in the traditional radar system, the time-bandwidth product of a signal source is equal to one. The radar resolution theory shows that a large bandwidth signal is needed to improve the distance resolution, a large time width signal is needed to improve the speed resolution, and a common signal cannot meet the requirements of the large time width and the large bandwidth, so that the pulse compression technology is widely applied to a pulse compression radar system, a phase coding signal is one of the pulse compression signals, and the contradiction between the large time width and the large bandwidth in the radar system is solved.
The traditional phase coding signal is generated on an electric domain, generally by using a direct digital synthesis method, but the center frequency of the generated phase coding signal on the electric domain is lower, the time bandwidth product is also very small, and the method has certain limitations.
In recent years, various schemes for phase-encoding microwave photons have been proposed, and a typical method is an optical heterodyne method, in which two phase-dependent wavelengths are used, one of the wavelengths is phase-modulated, and the phase of light is tapped onto a radio frequency signal via a PD. The core idea of the method is how to change the phase-related wavelength to different phase information, and the generation of the phase-coded signal is realized through frequency heterodyne. One method for realizing optical heterodyne is to utilize an integrated modulator, along with the development of integrated devices, the integrated modulator has more and more functional types, wherein a professor pennisetum group in 2013 proposes a microwave photon phase coding signal generation scheme based on a DD-MZM, and then the scheme of the integrated modulator is continuously emerged, a university topic group in Qinghua in 2017 utilizes a multi-wavelength light source to realize the generation of multi-band phase coding signals, and a Yaojian team in 2019 realizes the generation of phase coding signals on six different frequency bands based on a DP-BPSK modulator. However, the current phase-coded signal generation system and method are complicated in structure, and require wavelength or power control elements to be installed for phase modulation of two wavelengths respectively.
Disclosure of Invention
Based on the above-mentioned shortcomings and drawbacks of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a system and a method for generating a phase encoded signal based on a DOMZM, which satisfy one or more of the above-mentioned requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
a phase coding signal generation system based on DOMZM comprises a laser light source, a double-output Mach-Zehnder modulator, a code pattern signal generator, a radio frequency signal generator, a first optical switch, a second optical switch, a coupler and a photoelectric detector;
the output end of the laser light source is connected with the input end of the double-output Mach-Zehnder modulator, the double-output Mach-Zehnder modulator is provided with two complementary output ends, and the two output ends are respectively connected with the input ends of the first optical switch and the second optical switch; the code pattern signal generator is provided with two output ends which are respectively connected with the first optical switch and the second optical switch and used for sending control signals to the two optical switches and controlling the two optical switches to switch on-off states; the radio frequency signal generator is connected with the double-output Mach-Zehnder modulator; the output ends of the first optical switch and the second optical switch are coupled by the coupler and then connected with the photoelectric detector.
Preferably, the laser light source is a semiconductor laser.
Preferably, the two output terminals of the pattern signal generator have opposite polarities.
Preferably, the radio frequency signal generated by the radio frequency signal generator is cos (2 pi f)1t) wherein f1Is the frequency of the radio frequency signal。
The invention also provides a phase-coded signal generation method based on the DOMZM, which is applied to the system in any one of the above steps, and the method comprises the following steps:
s1, generating a continuous light wave by the laser light source, and inputting the continuous light wave into the double-output Mach-Zehnder modulator;
s2, the radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded to the double-output Mach-Zehnder modulator;
s3, generating digital signals by the code pattern generator, loading the digital signals on the first optical switch and the second optical switch respectively, and controlling the on-off of the first optical switch and the second optical switch;
and S4, coupling the optical signals output by the first optical switch and the second optical switch by using a coupler, and then inputting the optical signals into a photoelectric detector to generate an electric signal.
Preferably, the pattern signal generator controls the on/off of the first optical switch and the second optical switch by adjusting the amplitude and the bias point of the digital signal.
In a further preferred embodiment, the code pattern signal is applied to the first optical switch and the second optical switch to alternately turn on and off the first optical switch and the second optical switch.
Compared with the prior art, the invention has the beneficial effects that:
the frequency doubling device can frequency-multiply a radio-frequency signal to generate a frequency-doubled phase coding signal; the tunable frequency range is large; the whole system has no wavelength related device, and the whole structure is simple; only the code pattern signal generator is needed to control the on-off of the optical switch, and a power control element is not needed, so that the system structure is further simplified.
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FIG. 1 is a schematic structural diagram of a DOMZM-based phase-encoded signal generation system according to an embodiment of the present invention;
FIG. 2 is a graph of the output simulation results of a first optical switch according to an embodiment of the present invention;
FIG. 3 is a graph of the output simulation results of a second optical switch according to an embodiment of the present invention;
fig. 4 is a diagram of an output simulation result of the photodetector according to the embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example (b): the present embodiment provides a phase encoded signal generating system based on a DOMZM, a schematic structural diagram of which is shown in fig. 1, and the system includes a laser light source 1, a dual-output mach-zehnder modulator 2(DOMZM), a code pattern signal generator 4, a radio frequency signal generator 3, a first optical switch 5, a second optical switch 6, a coupler 7, and a photodetector 8;
the output end of the laser light source 1 is connected with the input end of the dual-output Mach-Zehnder modulator 2, the dual-output Mach-Zehnder modulator 2 has two complementary output ends, and the two output ends are respectively connected with the input ends of the first optical switch 5 and the second optical switch 6; the code pattern signal generator 4 is provided with two output ends which are respectively connected with the first optical switch 5 and the second optical switch 6, and sends control signals to the two optical switches to control the two optical switches to switch the on-off state; the output end of the radio frequency signal generator 3 is connected with the double-output Mach-Zehnder modulator 2 through a radio frequency line; the output ends of the first optical switch 5 and the second optical switch 6 are connected to the input end of the coupler 7 first and are coupled by the coupler 7, and the output end of the coupler 7 is connected to the input end of the photoelectric detector 8 by an optical fiber.
Specifically, the laser light source 1 in this embodiment is a semiconductor laser, so as to conveniently generate continuous light waves. The two output ends of the code type signal generator 4 have opposite polarities, and after the two optical switches are connected, the two optical switches are in different on-off states at the same time due to the opposite polarities, so that the dual-output mach-zehnder modulator 2 can complementarily and alternately output two optical signals.
Preferably, the rf signal generated by the rf signal generator in this embodiment is cos (2 pi f)1t) wherein f1The frequency of the radio frequency signal is such that the signal can be multiplied.
In another aspect, the present embodiment also provides a method for generating a phase encoded signal using the above system, the method comprising the steps of:
s1, generating a continuous light wave by using a laser light source, and inputting the continuous light wave into a double-output Mach-Zehnder modulator as input; the light wave can be expressed as: ein(t)＝E0exp(jωct) in which E0Expressed as the electric field amplitude, ω, of the input optical carriercIs the center frequency of the input optical carrier.
Then step S2 is carried out, the radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded on the double-output Mach-Zehnder modulator; the radio frequency signal may be a signal cos (2 π f)1t)。
Step S3 is performed to complementarily turn on and off the two optical signals output by the dual-output mach-zehnder modulator. The code pattern generator generates digital signals, and then the digital signals are respectively loaded on the first optical switch and the second optical switch as control signals, and the first optical switch and the second optical switch can change the on-off state according to the digital signals after receiving the digital signals; furthermore, in this step, the first optical switch and the second optical switch specifically switch on-off states according to the amplitude and the bias point of the digital signal, and the pattern generator only needs to change the amplitude and the bias point of the two paths of digital signals. In this step, the optical signals output by the first optical switch and the second optical switch are as shown in fig. 2 and fig. 3, respectively.
And S4, coupling the optical signals output by the first optical switch and the second optical switch by using a coupler, then inputting the optical signals into a photoelectric detector, and carrying out photoelectric conversion by the photoelectric detector to generate a high-frequency electric signal subjected to phase coding. Fig. 4 shows electrical signals output by the optical signals output by the first optical switch and the second optical switch after coupling and photoelectric conversion.
The theoretical derivation process of the above steps S2-S5 is as follows:
wherein Eout,1Eout,2The method is in a DOMZM two-path output electric field expression form; ein(t)＝E0exp(jωct) is light wave generated by a laser light source; omegacThe radio frequency signal is V ═ cos (2 pi f) for the central frequency of the light wave output by the laser light source1t)，f1For the frequency, V, of the radio-frequency signal generated by the radio-frequency signal generatorπIs the half-wave voltage of the dual output mach-zehnder modulator.
The two paths of the double-output Mach-Zehnder are respectively subjected to photoelectric conversion, and the structures are as follows:
wherein, Iout,1And Iout,2Are respectively Eout,1And Eout,2The corresponding result after photoelectric conversion shows that the difference between the two output results is accurate pi phase shift, which provides a frequency doubling basis for the phase coding of frequency doubling.
Then, according to
V＝cos(2πf1t)；
Wherein, JnRepresenting the expansion coefficients of the bezier function. In the above equation, the high order sidebands are negligible due to the small signal modulation, and the result can be expanded to the form of a double frequency signal.
Compared with the existing phase coding signal generation method, the DOMZM-based double-frequency phase coding signal generation system and method have the advantages that no wavelength related device is arranged in the whole system, a strict power control element is not needed, and the system structure is simpler. And the frequency doubling operation of the radio frequency signal is realized, the frequency tunable range is large, and the generated double-frequency phase coding signal has higher application value in a radar system.
It should be noted that the above-mentioned embodiments are merely illustrative of the preferred embodiments and principles of the present invention, and those skilled in the art will appreciate that there are variations in the specific embodiments based on the ideas provided by the present invention, and these variations should be considered as the scope of the present invention.
Claims (7)
1. A phase coding signal generation system based on a DOMZM (Domzm), which is characterized by comprising a laser light source, a double-output Mach-Zehnder adjuster, a code pattern signal generator, a radio frequency signal generator, a first optical switch, a second optical switch, a coupler and a photoelectric detector;
the output end of the laser light source is connected with the input end of the double-output Mach-Zehnder modulator, the double-output Mach-Zehnder modulator is provided with two complementary output ends, and the two output ends are respectively connected with the input ends of the first optical switch and the second optical switch; the code pattern signal generator is provided with two output ends which are respectively connected with the first optical switch and the second optical switch and used for sending control signals to the two optical switches to control the two optical switches to switch on-off states; the radio frequency signal generator is connected with the double-output Mach-Zehnder modulator; and the output ends of the first optical switch and the second optical switch are coupled by the coupler and then connected with the photoelectric detector.
2. The DOMZM-based phase-encoded signal generation system of claim 1, wherein the laser light source is a semiconductor laser.
3. The system of claim 1, wherein the two outputs of the code pattern signal generator are of opposite polarity.
4. The DOMZM-based phase-encoded signal generation system of claim 1, wherein said RF signal generator generates an RF signal that is cos (2 π f)1t) wherein f1Is the frequency of the radio frequency signal.
5. A method for generating phase-encoded signals based on DOMZM, using the system of claims 1-4, said method comprising the steps of:
s1, the laser light source generates continuous light waves and inputs the continuous light waves into the double-output Mach-Zehnder modulator;
s2, the radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded on the dual-output Mach-Zehnder modulator;
s3, the code pattern generator generates digital signals, the digital signals are respectively loaded on the first optical switch and the second optical switch, and the on-off of the first optical switch and the second optical switch is controlled;
and S4, coupling the optical signals output by the first optical switch and the second optical switch by using the coupler, and then inputting the optical signals into the photodetector to generate an electrical signal.
6. The method of claim 5, wherein the pattern signal generator controls the first optical switch and the second optical switch to be turned on and off by adjusting an amplitude and a bias point of the digital signal.
7. The method of claim 6, wherein the code pattern signal is applied to the first optical switch and the second optical switch to alternately switch the first optical switch and the second optical switch.
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| CN114978338A (en) * | 2022-05-11 | 2022-08-30 | 中国电子科技集团公司第二十九研究所 | High-speed BPSK phase modulation circuit of radio frequency signal is carried to light |
| CN115865207A (en) * | 2022-10-26 | 2023-03-28 | 西安空间无线电技术研究所 | Tunable multi-format signal generation device and method based on microwave photons |
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Cited By (3)
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