CN109088673B - Broadband signal microwave photon phase shifting method and system based on double carriers - Google Patents
Broadband signal microwave photon phase shifting method and system based on double carriers Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
Abstract
The invention discloses a broadband signal microwave photon phase shifting method and a system based on double carriers, wherein the method comprises the following steps: loading a local signal onto two optical carriers related to phases through upper sideband modulation, and loading a broadband radio frequency signal onto the two optical carriers through lower sideband modulation; filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave; and beating the filtered signals to obtain the broadband radio frequency signals with controlled phase shift. The invention can control the broadband signal to realize phase shift, thereby improving the speed and the system capacity of a wireless communication system, improving the beam pointing precision of a beam forming system, improving the angular resolution of a radar system and further improving the imaging resolution of an imaging radar.
Description
Technical Field
The invention relates to the technical field of photoelectron, in particular to a broadband signal microwave photon phase shifting method and system based on double carriers.
Background
Microwave photonics is a new field, and the main research subject is photonic devices working in microwave, millimeter wave and even terahertz wave bands and related applications thereof, and the research contents include generation, processing, conversion and distribution of ultrafast signals and high-speed signals, and transmission of microwave signals on a broadband optical link. The microwave photon phase shifter is an important signal processing technology in the field of microwave photonics, and the photon radio frequency phase shifting technology is a key technology in light-operated phased arrays and all-optical radio frequency vector modulation, and realizes the phase shifting function of radio frequency signals by utilizing optical and optoelectronic devices. Meanwhile, the photon phase shifter has the advantages of wide frequency band, strong electromagnetic interference resistance, low loss, light weight, small volume and the like, is widely applied to radar, communication, missile attitude control, instruments and microwave frequency measurement systems, and gradually becomes the main direction of research.
There are many reports about microwave photon phase shifters at home and abroad, and the adopted technologies mainly include optical true delay technology, heterodyne mixing technology, vector summation technology and the like. The phase shifter based on the optical true delay technology utilizes an optical fiber as a delay line to control the relative phase of a radio frequency signal between two adjacent radiation units, so that a space beam can be radiated to a specific direction, and the beam deflection is effectively inhibited. The phase shifter principle based on the heterodyne mixing technology is that two coherent lights with different frequencies are generated, the coherent lights are divided into two paths through photon filtering, then the phase of one path of light wave is controlled, the two modes of light are combined into one path through an optical coupler, and finally, a phase-controllable radio frequency signal is obtained through detection of a photoelectric detector. The phase shifter based on the vector sum technology has a simple principle, two paths of sinusoidal signals with the same frequency and different amplitudes and phases are superposed to generate a signal with a certain phase, and the phase of the signal can be controlled by the amplitude ratio of the two signals and the phase difference of the two signals.
However, the bandwidth of the phase-shifted signal generated by the phase shifter in the prior art is limited, so that the rate and the system capacity of the wireless communication system are limited.
Disclosure of Invention
In view of this, the present invention provides a method and a system for microwave photon phase shifting of a broadband signal based on dual carriers, which can control the broadband signal to implement phase shifting, thereby increasing the rate and the system capacity of a wireless communication system, increasing the beam pointing accuracy of a beam forming system, increasing the angular resolution of a radar system, and further increasing the imaging resolution of an imaging radar.
Based on the above purpose, the present invention provides a broadband signal microwave photon phase shifting method based on dual carriers, which comprises:
loading a local signal onto two optical carriers related to phases through upper sideband modulation, and loading a broadband radio frequency signal onto the two optical carriers through lower sideband modulation;
filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave;
and beating the filtered signals to obtain the broadband radio frequency signals with controlled phase shift.
The obtaining of the broadband radio frequency signal with controlled phase shift specifically includes:
and obtaining a broadband radio frequency signal with corresponding phase shift based on the phase change of the local signal.
The method comprises the steps of loading a local signal onto two optical carriers related to phases through upper sideband modulation, and loading a broadband radio frequency signal onto the two optical carriers through lower sideband modulation, and specifically comprises the following steps:
based on a double parallel Mach-Zehnder modulator (DPMZM), local signals are loaded onto two optical carriers related to phases through upper sideband modulation, and broadband radio frequency signals are loaded onto the two optical carriers through lower sideband modulation.
The obtaining of the broadband radio frequency signal with controlled phase shift specifically includes:
obtaining a broadband radio frequency signal with corresponding phase shift by adjusting direct current bias voltage on a main Mach-Zehnder modulator (MZM) of the DPMZM; or
And obtaining a broadband radio frequency signal with corresponding phase shift by adjusting the direct current bias voltage on a main Mach-Zehnder modulator (MZM) of the DPMZM and changing the phase of the local signal.
Wherein the relationship between the optical carrier, the local signal, and the broadband radio frequency signal is 2 ωs＝2ωRF+ωLO；
Wherein, 2 ωsIs the frequency difference, omega, between the up and down carriersLOIs the frequency, ω, of the local signalRFIs the center frequency of the wideband radio frequency signal.
The invention also provides a broadband signal microwave photon phase-shifting system based on double carriers, which comprises:
a dual carrier generation unit for generating two optical carriers that are phase-correlated;
the double modulation unit is used for loading the local signal onto the two optical carriers through upper sideband modulation and loading the broadband radio frequency signal onto the two optical carriers through lower sideband modulation;
the optical band-pass filtering unit is used for filtering an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave;
the beat frequency unit is used for carrying out beat frequency on the filtered signals;
and the phase shift control unit is used for enabling the beat frequency unit to output the broadband radio frequency signal with controlled phase shift.
According to the technical scheme, a local signal is loaded onto two optical carriers related to phases through upper sideband modulation, and a broadband radio frequency signal is loaded onto the two optical carriers through lower sideband modulation; filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave; and beating the filtered signal to obtain the broadband radio frequency signal with controlled phase shift. The technical scheme of the invention can control the broadband signal to realize phase shift, thereby improving the speed and the system capacity of the wireless communication system, improving the beam pointing precision of the beam forming system, improving the angular resolution of the radar system and further improving the imaging resolution of the imaging radar.
Drawings
Fig. 1 is a flowchart of a dual-carrier-based broadband signal microwave photonic phase shifting method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of frequency spectrums of two phase-dependent optical carriers according to an embodiment of the present invention;
fig. 3 is a schematic frequency spectrum diagram of a local signal loaded to two phase-dependent optical carriers through upper sideband modulation and a broadband radio frequency signal loaded to the two optical carriers through lower sideband modulation according to an embodiment of the present invention;
fig. 4 is a schematic diagram of controlling a corresponding displacement of a broadband radio frequency signal to- θ by changing a phase θ of a local signal according to an embodiment of the present invention;
fig. 5 is a block diagram of an internal structure of a dual-carrier-based broadband signal microwave photonic phase shift system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
According to the technical scheme, a local signal is loaded onto two optical carriers related to phases through upper sideband modulation, and a broadband radio frequency signal is loaded onto the two optical carriers through lower sideband modulation; filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave; and beating the filtered signal to obtain the broadband radio frequency signal with controlled phase shift. The technical scheme of the invention can control the broadband signal to realize phase shift, thereby improving the speed and the system capacity of the wireless communication system, improving the beam pointing precision of the beam forming system, improving the angular resolution of the radar system and further improving the imaging resolution of the imaging radar.
The technical solution of the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a broadband signal microwave photon phase shifting method flow based on double carriers, as shown in figure 1, comprising the following steps:
step S101: two optical carriers are generated that are phase-related.
Specifically, two optical carriers with different wavelengths and phase correlations can be generated by carrier Suppression double sideband (OCS) modulation based on a single light source laser and an optoelectronic modulator.
Alternatively, two optical carriers of different wavelengths, which are phase-related, are generated simultaneously by a single multi-wavelength laser.
For example, assume that the incident light is:
via radio frequency signal VscosωsIf the t modulation realizes the carrier suppression double sideband, the output is:
when phi of the above formula is-pi,
thus, two phase-dependent optical carriers are generated by carrier-suppressed double sideband modulation, each having a frequency ωc1＝ωc-ωsAnd ωc2＝ωc+ωsI.e. the frequency difference between the up and down carriers of the optical carrier is 2 omegasAs shown in fig. 2.
Step S102: the local signal is loaded onto two optical carriers that are phase-related by upper sideband modulation and the broadband radio frequency signal is loaded onto the two optical carriers by lower sideband modulation.
Specifically, loading the local signal onto two phase-dependent optical carriers through upper sideband modulation and loading the broadband radio frequency signal onto the two optical carriers through lower sideband modulation can be implemented based on a Dual-parallel Mach-zehnder modulator (DPMZM), as shown in fig. 3:
the two phase-related optical carriers are incident to the DPMZM, and the two paths of light of the upper and lower carrier waves are correspondingly modulated at the same time; in fact, a DPMZM consists of three MZMs (Mach-Zehnder modulators), including two sub MZMs and one main MZM; the two sub MZMs are respectively embedded into two arms of the main MZM, have the same performance and structure, and each sub MZM is provided with an independent radio frequency signal input port and an independent direct current bias voltage input port; the main MZM is provided with a direct current bias voltage input port, and the main MZM has the function of introducing phase difference between optical signals output by the two sub MZMs and coupling the upper optical signal and the lower optical signal together. In the Upper arm of the main MZM, one sub MZM loads the local signal onto two optical carriers by Upper-Single Sideband (UP-SSB) modulation. In the Lower arm of the main MZM, the other sub MZM also loads a broadband radio frequency signal onto two optical carriers by Lower-Single Sideband (Low-SSB) modulation.
In the upper arm of the main MZM, via the local signal VLO·cos(ωLOt + θ) and the output is:
wherein, ω isLOFrequency of local signal in narrow band, theta is phase of local signal, VLOIs the amplitude of the local signal.
In the lower arm of the main MZM, via a broadband radio frequency signal VRF·g(t)·cos(ωRFt) modulation, the output is:
wherein, ω isRFIs the center frequency, V, of a broadband radio frequency signalRFG (t) is the amplitude of the broadband radio frequency signal.
Step S103: and filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave.
Specifically, an Optical Band Pass Filter (OBPF) is used to filter out the upper sidebands of the lower carriers of the two optical carriers and the lower sidebands of the upper carriers of the two optical carriers.
Thus, the signal output after passing through the optical bandpass filter is:
step S104: and beating the filtered signals to obtain the broadband radio frequency signals with controlled phase shift.
Specifically, the relationship between the optical carrier, the local signal, and the broadband radio frequency signal is set to 2 ωs＝2ωRF+ωLOThen, the output light enters the Photodetector (PD) for beat frequency to obtain the following photocurrent formula:
it can be seen from the above photocurrent formula that the phase shift of the broadband radio frequency signal is realized: as shown in FIG. 4, by controlling the phase θ of the local signal, the broadband RF signal in the photocurrent formula is obtained
The corresponding displacement is-theta. Thus, a phase shifting system which can continuously tune the phase of the broadband radio frequency signal by 0-360 degrees is realized. Meanwhile, radio frequency signals detected by the PD realize that broadband radio frequency signals are related to the central frequency omegaRFSymmetric inversion, which has no influence on frequency spectrum symmetric signal modulation (including intensity modulation and partial phase modulation), propagation demodulation, and which can realize signal conjugate inversion for broadband chirp signals.
As can be seen from the above, for the phase shift control of the broadband radio frequency signal, the broadband radio frequency signal with the corresponding phase shift can be obtained based on the phase change of the narrowband local signal; in addition, a broadband radio-frequency signal with corresponding phase shift can be obtained by adjusting the direct-current bias voltage on a main Mach-Zehnder modulator MZM of the DPMZM; or the broadband radio-frequency signal with the corresponding phase shift is obtained by adjusting the direct-current bias voltage on the main Mach-Zehnder modulator MZM of the DPMZM and changing the phase of the local signal.
Based on the above method, an internal structure block diagram of the broadband signal microwave photonic phase shift system based on dual carriers provided by the embodiment of the present invention, as shown in fig. 5, includes: a dual carrier generation unit 501, a dual modulation unit 502, an optical bandpass filtering unit 503, a beat frequency unit 504, and a phase shift control unit (not shown).
The dual carrier generation unit 501 is configured to generate two optical carriers that are phase-correlated;
the dual modulation unit 502 is configured to load a local signal onto the two optical carriers through upper sideband modulation, and load a broadband radio frequency signal onto the two optical carriers through lower sideband modulation;
the optical band-pass filtering unit 503 is configured to filter an upper sideband signal of a lower carrier of the optical carrier and a lower sideband signal of an upper carrier;
the beat frequency unit 504 is configured to beat frequency of the filtered signal;
the phase shift control unit 505 is configured to enable the beat unit 504 to output a broadband radio frequency signal with controlled phase shift.
The dual carrier generation unit 501 may include a single light source Laser (LD) and a photoelectric modulator (MZM); the incident light of the LD-emission electro-optical modulator is:
via radio frequency signal Vscosωst is modulated in a photoelectric modulator to realize carrier suppression double sidebands, and the output frequencies are respectively omegac1＝ωc-ωsAnd ωc2＝ωc+ωsTwo phase-dependent optical carriers.
The double modulation unit 502 may be a DPMZM specifically, and implements that a local signal is loaded onto two optical carriers related to a phase through upper sideband modulation, and a broadband radio frequency signal is loaded onto the two optical carriers through lower sideband modulation; wherein the optical carrier wave,The relation between the local signal and the broadband radio frequency signal is 2 omegas＝2ωRF+ωLO(ii) a Wherein, 2 ωsIs the frequency difference, omega, between the up and down carriersLOIs the center frequency, ω, of the local signalRFIs the center frequency of the wideband radio frequency signal. The specific modulation method of the dual modulation unit 502 is detailed in the step S102, and is not described herein again.
The optical bandpass filtering unit 503 may specifically filter out the upper sidebands of the lower carriers of the two optical carriers and the lower sidebands of the upper carriers of the two optical carriers by using an optical bandpass filter (OBPF).
The beat unit 504 may specifically use a Photodetector (PD) to beat the signal filtered by the optical bandpass filtering unit 503.
The phase shift control unit may specifically change the phase of the local signal, so that the beat unit 504 outputs a broadband radio frequency signal with a corresponding phase shift; or
The phase shift control unit may specifically be configured to adjust a dc bias voltage on a main mach-zehnder modulator MZM of the DPMZM, so that the beat unit 504 outputs a broadband radio frequency signal with a corresponding phase shift; or
The phase shift control unit may specifically adjust a dc bias voltage on the main mach-zehnder modulator MZM of the DPMZM and change the phase of the local signal, so that the beat unit 504 outputs a broadband radio frequency signal with a corresponding phase shift.
According to the technical scheme, a local signal is loaded onto two optical carriers related to phases through upper sideband modulation, and a broadband radio frequency signal is loaded onto the two optical carriers through lower sideband modulation; filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave; and beating the filtered signal to obtain the broadband radio frequency signal with controlled phase shift. The technical scheme of the invention can control the broadband signal to realize phase shift, thereby improving the speed and the system capacity of the wireless communication system, improving the beam pointing precision of the beam forming system, improving the angular resolution of the radar system and further improving the imaging resolution of the imaging radar.
Those skilled in the art will appreciate that the present invention includes apparatus directed to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random Access memories), EPROMs (Erasable programmable Read-Only memories), EEPROMs (Electrically Erasable programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the features specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.
Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A broadband signal microwave photon phase shifting method based on double carriers is characterized by comprising the following steps:
loading a local signal onto two optical carriers related to phases through upper sideband modulation, and loading a broadband radio frequency signal onto the two optical carriers through lower sideband modulation;
filtering out an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave;
beating the filtered signals to obtain phase-shift controlled broadband radio frequency signals;
wherein the relationship between the optical carrier, the local signal, and the broadband radio frequency signal is 2 ωs＝2ωRF+ωLO；
Wherein, 2 ωsIs the frequency difference, omega, between the up and down carriersLOIs the frequency, ω, of the local signalRFIs the center frequency of the wideband radio frequency signal.
2. The method according to claim 1, characterized in that said obtaining a broadband radio frequency signal with controlled phase shift is in particular:
and obtaining a broadband radio frequency signal with corresponding phase shift based on the phase change of the local signal.
3. The method according to claim 1, wherein the local signal is loaded onto two phase-dependent optical carriers by upper sideband modulation, and the broadband radio frequency signal is loaded onto the two optical carriers by lower sideband modulation, specifically:
based on a double parallel Mach-Zehnder modulator (DPMZM), local signals are loaded onto two optical carriers related to phases through upper sideband modulation, and broadband radio frequency signals are loaded onto the two optical carriers through lower sideband modulation.
4. The method according to claim 3, characterized in that said obtaining a broadband radio frequency signal with controlled phase shift is in particular:
obtaining a broadband radio frequency signal with corresponding phase shift by adjusting direct current bias voltage on a main Mach-Zehnder modulator (MZM) of the DPMZM; or
And obtaining a broadband radio frequency signal with corresponding phase shift by adjusting the direct current bias voltage on a main Mach-Zehnder modulator (MZM) of the DPMZM and changing the phase of the local signal.
5. The method according to any of claims 1-4, wherein the two phase-related optical carriers are generated according to the following method:
two optical carriers which are related in phase and different in wavelength are generated by carrier suppression double-sideband modulation based on a single light source laser and a photoelectric modulator; or
Two phase-dependent optical carriers with different wavelengths are generated simultaneously by a multi-wavelength laser.
6. A broadband signal microwave photon phase shift system based on double carriers is characterized by comprising:
a dual carrier generation unit for generating two optical carriers that are phase-correlated;
the double modulation unit is used for loading the local signal onto the two optical carriers through upper sideband modulation and loading the broadband radio frequency signal onto the two optical carriers through lower sideband modulation;
the optical band-pass filtering unit is used for filtering an upper sideband signal of a lower carrier wave and a lower sideband signal of an upper carrier wave of the optical carrier wave;
the beat frequency unit is used for carrying out beat frequency on the filtered signals;
the phase shift control unit is used for enabling the beat frequency unit to output the broadband radio frequency signal with controlled phase shift;
wherein the relationship between the optical carrier, the local signal, and the broadband radio frequency signal is 2 ωs＝2ωRF+ωLO；
Wherein, 2 ωsIs the frequency difference, omega, between the up and down carriersLOIs the center frequency, ω, of the local signalRFIs the center frequency of the wideband radio frequency signal.
7. The system of claim 6,
the phase shift control unit is specifically configured to control a change of a phase of the local signal, so that the beat unit outputs a broadband radio frequency signal with a corresponding phase shift.
8. The system according to claim 6, characterized in that said dual modulation unit is in particular a DPMZM; and the number of the first and second groups,
the phase shift control unit is specifically used for adjusting a direct current bias voltage on a main Mach-Zehnder modulator (MZM) of the DPMZM, so that the beat unit outputs a broadband radio frequency signal with a corresponding phase shift; or
The phase shift control unit is specifically configured to adjust a dc bias voltage on a main mach-zehnder modulator MZM of the DPMZM, and change a phase of the local signal, so that the beat unit outputs a broadband radio frequency signal with a corresponding phase shift.
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