CN114301538B - DOMZM-based phase coding signal generation system and method - Google Patents
DOMZM-based phase coding signal generation system and method Download PDFInfo
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Abstract
The invention relates to a phase coding signal generating system based on DOMZM, wherein a laser light source is connected with an input end of a dual-output Mach-Zehnder adjuster, and the dual-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 type 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 dual-output Mach-Zehnder modulator; the output ends of the first optical switch and the second optical switch are coupled with the photoelectric detector through the coupler. The system can multiply the frequency of the radio frequency signal to generate a double frequency phase coding signal; the frequency tunable range is large; the whole system has no wavelength related devices, 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 DOMZM-based phase coding signal generation system and method.
Background
The generation of the phase encoded signal is important for improving the range resolution and the speed resolution of the radar, and in a conventional radar system, the time-bandwidth product of a general signal source is equal to one. The radar resolution theory shows that in order to improve the distance resolution, a large bandwidth signal is needed, in order to improve the speed resolution, a large time-width signal is needed, and the 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, the phase encoding 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 in an electric domain, generally by a direct digital synthesis method, but the center frequency of the phase coding signal generated in the electric domain is lower, the time bandwidth product is also small, and the method has certain limitation, the radar now is developing to the high-frequency band, reconfigurable and multi-frequency band direction, obviously, the signal generated in the electric domain can not meet the requirements of the modern radar, and along with the development of the microwave photonics technology, people can finish the operations of signal generation, processing, transmission and the like which can not be achieved in the electric domain by utilizing the advantages of large frequency operation range, small transmission loss, no electromagnetic interference, small system volume, light weight and the like of the optical domain.
In recent years, various schemes for encoding a signal by using a microwave photon phase have been proposed, and a typical method is an optical heterodyning method, in which two phase-related wavelengths are used to perform phase modulation on one of the wavelengths, and the phase on the light is tapped onto a radio frequency signal through a PD. The core idea of this method is how to make the phase related wavelengths exchange different phase information, and the generation of the phase encoded signal is achieved by frequency heterodyning. One way to implement optical heterodyning is to use an integrated modulator, with the development of integrated devices, the variety of functions of the integrated modulator is increasing, wherein Pan Shilong professor team 2013 proposes a scheme for generating a microwave photon phase-encoded signal based on DD-MZM, then the scheme using the integrated modulator is continuously emerging, and 2017 university of light bloom subject group uses a multi-wavelength light source to implement generation of a multi-band phase-encoded signal, and 2019 team Yao Jianping implements generation of a phase-encoded signal on six different frequency bands based on DP-BPSK modulator. However, the current phase-encoded signal generation system and method have a very complex structure, and require the installation of wavelength or power control elements to perform phase modulation on the two wavelengths respectively.
Disclosure of Invention
In view of the foregoing drawbacks and deficiencies of the prior art, it is therefore an object of the present invention to provide a system and method for generating a phase encoded signal based on DOMZM that addresses one or more of the above-mentioned problems, in other words, one or more of the above-mentioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a phase coding signal generation system based on DOMZM comprises a laser light source, a dual-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 dual-output Mach-Zehnder modulator, the dual-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 type signal generator is provided with two output ends which are respectively connected with the first optical switch and the second optical switch, and sends 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 dual-output Mach-Zehnder modulator; the output ends of the first optical switch and the second optical switch are coupled with the photoelectric detector through the coupler.
Preferably, the laser light source is a semiconductor laser.
Preferably, the polarities of the two output terminals of the code pattern signal generator are opposite.
Preferably, the RF signal generator generates an RF signal of cos (2pi.f 1 t), f 1 Is the frequency of the radio frequency signal.
The invention also provides a phase coding signal generating method based on the DOMZM, which applies the system of any one of the above steps:
s1, generating continuous light waves by a laser light source, and inputting the continuous light waves into a dual-output Mach-Zehnder modulator;
s2, a radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded on the dual-output Mach-Zehnder modulator;
s3, a code pattern signal 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;
s4, coupling optical signals output by the first optical switch and the second optical switch by using a coupler, and inputting the optical signals into a photoelectric detector to generate an electric signal.
Preferably, the code 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.
As a further preferable scheme, the code pattern signal is loaded on the first optical switch and the second optical switch to enable the first optical switch and the second optical switch to be alternately switched on and off.
Compared with the prior art, the invention has the beneficial effects that:
the radio frequency signal can be multiplied to generate a double frequency phase coding signal; the frequency tunable range is large; the whole system has no wavelength related devices, 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.
Drawings
FIG. 1 is a schematic diagram of a DOMZM-based phase encoded signal generation system according to an embodiment of the present invention;
FIG. 2 is a graph of simulation results of the output of a first optical switch according to an embodiment of the present invention;
FIG. 3 is a graph of simulation results of the output of a second optical switch according to an embodiment of the present invention;
fig. 4 is a graph showing simulation results of the output 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, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Examples: the embodiment provides a phase coding signal generating system based on DOMZM, the structure of which is shown in FIG. 1, and the system comprises 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 photoelectric detector 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 is provided with 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 on-off states; the output end of the radio frequency signal generator 3 is connected with the dual-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, the input end of the coupler 7 is 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 that continuous light waves can be generated conveniently. The polarities of the two output ends of the code type signal generator 4 are opposite, and after the code type signal generator is connected with the two optical switches, the two optical switches are in different on-off states at the same time due to the opposite polarities, so that the two optical signals can be complementarily and alternately output by the dual-output Mach-Zehnder modulator 2.
Preferably, the RF signal generated by the RF signal generator in this embodiment is cos (2πf 1 t), f 1 For the frequency of the radio frequency signal, the signal is enabled to multiply.
In another aspect, the present embodiment further provides a method for generating a phase encoded signal using the above system, the method including the steps of:
s1, generating continuous light waves by using a laser light source, and inputting the continuous light waves into a dual-output Mach-Zehnder modulator as input; the light waves can be expressed as: e (E) in (t)＝E 0 exp(jω c t), wherein E 0 Represented as the electric field of the input optical carrierAmplitude omega c Is the center frequency of the input optical carrier.
Step S2, a radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded on the dual-output Mach-Zehnder modulator; the radio frequency signal may be a signal cos (2pi.f 1 t)。
And then, performing step S3 to complementarily switch on and off the two paths of optical signals output by the dual-output Mach-Zehnder modulator. The code pattern signal generator generates a digital signal, the digital signal is respectively loaded on the first optical switch and the second optical switch to be used as control signals, and after the first optical switch and the second optical switch receive the digital signal, the on-off state can be changed according to the digital signal; 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 signals, and the code pattern signal 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 shown in fig. 2 and 3, respectively.
S4, coupling the optical signals output by the first optical switch and the second optical switch by using a coupler, inputting the optical signals into a photoelectric detector, and generating a high-frequency electric signal subjected to phase coding after photoelectric conversion by the photoelectric detector. The electrical signals output by the optical signals output by the first optical switch and the second optical switch after coupling and photoelectric conversion are shown in fig. 4.
The theoretical derivation process of the above steps S2-S5 is as follows:
wherein E is out,1 E out,2 The expression form of the electric field is output for two paths of DOMZM; e (E) in (t)＝E 0 exp(jω c t) is a light wave generated by a laser light source; omega c In outputting light waves for a laser light sourceThe heart frequency, the radio frequency signal is v=cos (2pi f 1 t)，f 1 For the frequency, V, of the RF signal generated by the RF signal generator π Is a half-wave voltage of a dual output mach-zehnder modulator.
The structure after photoelectric conversion of the two paths of the dual-output Mach-Zehnder respectively comprises the following steps:
wherein I is out,1 And I out,2 Respectively E out,1 And E is out,2 From the above results, it can be seen that the output results of the two paths differ by exactly pi phase shift, which provides a frequency multiplication basis for the frequency-doubled phase encoding.
Then according to
V＝cos(2πf 1 t)；
Wherein J is n Representing the bezier expansion coefficient. In the above equation, the high-order sidebands are negligible due to the small signal modulation, and thus the result can be spread out in the form of a frequency-doubled signal.
Compared with the existing phase code signal generation method, the DOMZM-based frequency doubling phase code signal generation system and method have no wavelength related devices in the whole system, do not need strict power control elements, and have simpler system structure. And the frequency multiplication operation of the radio frequency signal is realized, the frequency tunable range is large, and the generated frequency doubling phase coded signal has higher application value in a radar system.
It is to be understood that the foregoing is only illustrative of the preferred embodiments and concepts of the invention and that modifications in this detailed description will readily suggest themselves to those skilled in the art in view of the teachings of this invention, and are to be regarded as illustrative of the scope of the invention.
Claims (7)
1. The system is characterized by comprising a laser light source, a dual-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 dual-output Mach-Zehnder modulator, the dual-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 type signal generator is provided with two output ends which are respectively connected with the first optical switch and the second optical switch, and sends 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 dual-output Mach-Zehnder modulator; the output ends of the first optical switch and the second optical switch are coupled with the photoelectric detector after being coupled by the coupler.
2. A DOMZM based phase encoded signal generating system as defined in claim 1, wherein said laser source is a semiconductor laser.
3. A DOMZM-based phase encoded signal generating system as claimed in claim 1, wherein the two outputs of said pattern signal generator are of opposite polarity.
4. The system of claim 1, wherein the RF signal generated by the RF signal generator is cos (2πf 1 t), f 1 Is the frequency of the radio frequency signal.
5. A method of generating a phase encoded signal based on DOMZM using the system of any of claims 1-4, the method comprising the steps of:
s1, generating continuous light waves by the laser light source, and inputting the continuous light waves into the dual-output Mach-Zehnder modulator;
s2, the radio frequency signal generator generates a radio frequency signal, and the radio frequency signal is loaded to the dual-output Mach-Zehnder modulator;
s3, the code pattern signal 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;
s4, coupling the optical signals output by the first optical switch and the second optical switch by using the coupler, and inputting the optical signals into the photoelectric detector to generate an electric signal.
6. The method of generating a DOMZM-based phase encoded signal according to claim 5, wherein said pattern generator controls the on/off of said first optical switch and said second optical switch by adjusting the amplitude and bias point of said digital signal.
7. The method for generating a DOMZM-based phase encoded signal as claimed in claim 6, wherein said pattern signal is applied to said first optical switch and said second optical switch to alternately turn on and off said first optical switch and said second optical switch.
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