CN113162693A - Full-duplex communication system and method for eliminating radio frequency self-interference - Google Patents
Full-duplex communication system and method for eliminating radio frequency self-interference Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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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
- H04B10/40—Transceivers
Abstract
The invention provides a full-duplex communication system and method for eliminating radio frequency self-interference, belongs to the technical field of radio frequency self-interference elimination and microwave photonics, and is used for solving the defects that the existing method is single in function and cannot transmit long-distance optical fibers. Specifically, the method comprises the steps of converting signals into an optical domain through a dual-polarization dual-parallel Mach-Zehnder electro-optic modulator, enabling the electro-optic modulator to work at a special transmission point through controlling direct-current bias voltage of the electro-optic modulator, and separating signals in different polarization states output by the modulator through a polarization beam splitter: one path of the signals retains the corresponding sideband of the signal by using a filter, and the signals are subjected to photoelectric conversion by a photoelectric detector to obtain an up-conversion signal for signal transmission; and in addition, the other path of signal retains the corresponding sideband of the signal subjected to interference elimination by using a filter, and the signal is subjected to photoelectric conversion by a photoelectric detector to obtain a down-conversion signal so as to complete the processing of the received signal. The invention realizes the integration of receiving and transmitting, can not only simultaneously carry out up-conversion and down-conversion, but also eliminate the radio frequency self-interference of the system.
Description
Technical Field
The invention provides a full-duplex communication system and a full-duplex communication method for radio frequency self-interference elimination, and belongs to the technical field of radio frequency self-interference elimination and microwave photonics.
Background
With the development of communication technology and the coming of the 5G era, the requirements of people on the utilization rate of frequency spectrum resources and the data transmission rate are higher and higher, and in order to meet the requirements, a simultaneous same-frequency full-duplex communication technology is provided. However, in full duplex communication, since the transmitting signal and the receiving signal are in the same frequency band, a strong transmitting signal may directly leak to the receiving end, and cover a weak receiving signal, which causes system self-interference or co-site interference, and the self-interference signal cannot be directly filtered by a notch filter or a narrow band filter. Therefore, the system self-interference becomes one of the problems to be solved urgently in the full-duplex communication technology.
In order to solve the problem of system self-interference in the full-duplex communication technology, people convert from the electrical field to the optical field with large bandwidth, high precision and low loss. The radio frequency self-interference elimination based on the optical field is realized by converting a radio frequency electric signal into an optical domain for processing by using an electric modulator and then carrying out subsequent processing after carrying out photoelectric conversion by using a photoelectric detector.
Some existing optical domain radio frequency self-interference elimination technologies are self-interference signal elimination realized after photoelectric conversion, so that when signals are transmitted in optical fibers, radio frequency self-interference signals can be reproduced; some radio frequency self-interference cancellation techniques only consider the processing of received signals, and cannot realize receiving and transmitting integration, and many cancellation techniques are affected by fiber dispersion and cannot realize long-distance fiber transmission.
Disclosure of Invention
The invention provides a full-duplex communication system and a method for eliminating radio frequency self-interference, aiming at solving the defects that the prior method has single function and cannot transmit long-distance optical fibers. The method can realize the integration of receiving and transmitting, can realize up-conversion and down-conversion simultaneously, and can eliminate the radio frequency self-interference of the system.
A full-duplex communication system for eliminating radio frequency self-interference comprises a radio frequency source 1(1), a radio frequency source 2(2), a laser (3), a Polarization Controller (PC) (4), a polarization-maintaining optical fiber branching unit (5), a dual-polarization dual-parallel Mach-Zehnder (DP-DPMZM) modulator (6), a Polarization Beam Splitter (PBS) (7), an optical band-pass filter 1(OBPF1) (8), a photoelectric detector 1(PD1) (9), an optical band-pass filter 2(OBPF2) (10), an optical fiber amplifier (EDFA) (11), a single-mode fiber (SMF) (12), a photoelectric detector 2(PD2) (13), an electric phase shifter (14), an electric attenuator (15), a power divider (16) and an electric coupler (17). The output end of the laser (3) is connected with the input end of the polarization controller (4), and the output end of the polarization controller (4) is connected with the input end of the polarization-maintaining optical fiber branching unit (5); the optical carrier is divided into two paths by a polarization maintaining fiber branching unit (5), wherein one output end is connected with the optical input end of an upper path X-DPMZM of the DP-DPMZM modulator, and the other output end is connected with the laser input end of a lower path Y-DPMZM of the DP-DPMZM modulator;
an upper X-DPMZM of the DP-DPMZM modulator is provided with two radio frequency input ports, and a radio frequency signal output by a radio frequency source 1(1) is connected with one radio frequency input end of the X-DPMZM as an intermediate frequency signal (IF); the radio frequency signal output by the radio frequency source 2(2) is used as a local oscillator signal (LO) to be connected with the other radio frequency input end of the X-DPMZM;
the lower Y-DPMZM of the DP-DPMZM modulator is provided with two radio frequency input ports; a reference signal divided by the power divider (16) passes through the electric phase shifter (14) and the electric attenuator (15) in sequence, is coupled with a local oscillation signal output by the radio frequency source 2(2) through the electric coupler (17), and is used as a radio frequency source to be connected with one radio frequency input end of the Y-DPMZM; a signal received by the receiving antenna is used as another radio frequency source to be connected with the other radio frequency input end of the Y-DPMZM;
the output end of the DP-DPMZM modulator (6) is connected with the input end of the polarization beam splitter (7); the modulation signal modulated by the DP-DPMZM modulator is divided into two paths by a polarization beam splitter (7), wherein one path of output end is sequentially connected with a photoelectric band-pass filter 1(8) and a photoelectric detector 1(9) through optical fibers, and the output end of the photoelectric detector 1(9) is connected with the input end of a power divider (16) through a cable; the power divider (16) has two paths of outputs, one of which is a transmitting signal, and the output end is connected with a transmitting antenna; the other path of output of the power divider (16) is used as a reference signal; the other output end of the polarization beam splitter (7) is sequentially connected with the optical band-pass filter 2(10), the optical fiber amplifier (11), the single-mode optical fiber (12) and the photoelectric detector 2(13) through optical fibers, and the photoelectric detector 2(13) outputs a received signal after noise elimination;
a full duplex communication method for eliminating radio frequency self-interference comprises the following processes:
step 1: an optical signal output by the laser (3) passes through the polarization controller (4) and then is divided into two paths by the polarization-maintaining fiber branching unit (5), and the two paths respectively enter an X-DPMZM path and a Y-DPMZM path of the DP-DPMZM modulator and are used as optical carriers of the DP-DPMZM modulator;
step 2: taking an intermediate frequency signal sent by a radio frequency source 1(1) as a radio frequency driving signal of one sub MZM of an X-DPMZM path, and taking a local oscillator signal sent by a radio frequency source 2(2) as a radio frequency driving signal of the other sub MZM of the X-DPMZM path;
and step 3: controlling three direct current bias voltages of the X-DPMZM to enable signals output by two sub MZMs to be in a carrier suppression double-sideband modulation state;
and 4, step 4: the +1 order sideband of the modulated intermediate frequency signal and the-1 order sideband of the local oscillation signal are reserved through the OBPF1(8), and are divided into two paths by the power divider (16) after being subjected to beat frequency by the photoelectric detector 1(9), wherein one path is used as a transmitting signal to be transmitted, and the other path is used as a reference signal;
and 5: after passing through an electric phase shifter (14) and an electric attenuator (15), a reference signal and a local oscillation signal output by a radio frequency source 2(2) are coupled together through an electric coupler (17) to be used as a radio frequency driving signal of one sub MZM of the Y-DPMZM, and a signal received by a receiving antenna is used as another radio frequency source to be used as a radio frequency driving signal of the other sub MZM of the Y-DPMZM, wherein the received signal comprises a signal of interest and an interference signal;
step 6: the amplitude of a reference signal is matched with that of an interference signal through controlling a main direct current bias voltage, an electric phase shifter and an electric attenuator of the Y-DPMZM, and the phase difference is 180 degrees, so that mutual cancellation is realized, wherein two sub MZMs of the Y-DPMZM are in an orthogonal bias state through controlling three direct current bias voltages of the Y-DPMZM;
step 6: the +1 order sideband of the signal of interest and the +1 order sideband of the local oscillation signal are reserved through the OBPF2(10), and then after sequentially passing through the optical fiber amplifier (11) and the single mode optical fiber (12), the received signal after interference elimination is obtained through beat frequency of the photoelectric detector 2 (13).
In conclusion, the invention realizes the up-conversion and signal transmission of signals after the modulated signals are filtered by the OBPF1(8) and the beat frequency of the PD1 (9); the condition of phase inversion in radio frequency self-interference elimination is realized by controlling the voltage of a main direct current bias point of a Y-DPMZM circuit, and the self-interference signal in a received signal is eliminated by further adjusting an electric phase shifter and an electric attenuator; the down-conversion of the signal is realized after the filtering of the modulation signal and the beating of the PD2(13) by the OBPF 2. Therefore, the method realizes receiving and transmitting integration, and up-conversion, down-conversion and system radio frequency self-interference elimination.
The invention has the beneficial effects that:
the invention can realize the elimination of the upper and lower frequency conversion of the signal and the self-interference of the system radio frequency by controlling the direct current bias point of the DP-DPMZM modulator and filtering the filter, thereby completing the receiving and transmitting of the signal.
The intermediate frequency signal after the down-conversion is a carrier suppression single-side band signal, so that the power fading effect caused by optical fiber dispersion in the long-distance optical fiber transmission process is effectively avoided.
Drawings
Fig. 1 is a flow chart of a full-duplex communication method for radio frequency self-interference cancellation.
Fig. 2 is a schematic diagram of a link structure of a full-duplex communication system with radio frequency self-interference cancellation.
Fig. 3 is a schematic diagram of frequency spectrums at (a), (b), (c) and (d) in fig. 2 when the signal is up-converted.
Fig. 4 is a schematic diagram of frequency spectrums at (e), (f), (g) and (h) in fig. 2 when the signal is down-converted and the radio frequency self-interference is eliminated simultaneously.
Wherein, (1) the radio frequency source 1; (2) a radio frequency source 2; (3) a laser; (4) a polarization controller; (5) a polarization maintaining fiber splitter; (6) a dual-polarization dual-parallel Mach-Zehnder modulator; (7) a polarizing beam splitter; (8) a photoelectric band-pass filter 1; (9) a photodetector 1; (10) an optical band-pass filter 2; (11) an optical fiber amplifier; (12) a single mode optical fiber; (13) a photodetector 2; (14) an electric phase shifter; (15) an electrical attenuator; (16) a power divider; (17) the electric coupler Tx: a transmitting antenna; rx: a receiving antenna; ESA: an electric spectrum analyzer; LO: a local oscillator signal; IF: an intermediate frequency signal; SOI: a signal of interest; si: an interference signal; sr: reference signal
Detailed Description
The invention is further described below with reference to the following figures and mathematical derivations:
fig. 1 is a structural diagram of a full-duplex communication method system for eliminating radio frequency self-interference according to the present invention, which includes a radio frequency source 1, a radio frequency source 2, a laser, a polarization controller, a polarization maintaining fiber splitter, a dual-polarization dual-parallel mach-zehnder (DP-DPMZM) modulator, a polarization beam splitter, an optical band pass filter 1, a photodetector 1, an optical band pass filter 2, an optical fiber amplifier, a single mode fiber, a photodetector 2, an electrical phase shifter, an electrical attenuator, a power divider, and an electrical coupler.
After passing through the polarization controller, the optical signal output by the laser is divided into two paths by the polarization-maintaining fiber branching unit as optical carriers to respectively enter an X-DPMZM path and a Y-DPMZM path of the dual-polarization double-parallel Mach-Zehnder modulator.
The radio frequency signals output by the radio frequency source 1 and the radio frequency source 2 are converted into an optical domain through the X-DPMZM.
And the carrier suppression double-sideband modulation of the two paths of signals is realized by controlling the direct current bias point of the X-DPMZM.
The signal modulated by the X-DPMZM passes through the band-pass filter 1, the-1 order sideband of the local oscillation signal and the +1 order sideband of the intermediate frequency signal are reserved, the signal up-conversion is realized after the photoelectric conversion is carried out by the photoelectric detector 1, the signal after the up-conversion is divided into two paths by the power divider, and one path is used as a transmitting signal to be transmitted.
And the other path of signals divided by the power divider is used as a reference signal, and is coupled with a local oscillator signal through an electric coupler to be used as a path of radio frequency signals and signals received by a receiving antenna to be converted into an optical domain through the Y-DPMZM.
The orthogonal bias states of two paths of signals are realized by controlling the direct current bias points of two sub MZMs of the Y-DPMZM; and the condition of phase inversion in the elimination of the radio frequency self-interference of the system is realized by controlling the direct current bias point of the main MZM.
The signal modulated by the Y-DPMZM passes through a band-pass filter 2, and the +1 order sidebands of the interested signal and the local oscillation signal are reserved.
The filtered signal sequentially passes through the optical fiber amplifier and the single-mode optical fiber, and then is subjected to photoelectric conversion by the photoelectric detector 2, so that the down-conversion of the signal is realized.
The self-interference elimination of the system is realized by controlling a main direct current bias point of the Y-DPMZM, an electric phase shifter and an electric attenuator; the integration of up-conversion, down-conversion and transceiving of the system is realized by controlling the direct current bias point of the DP-DPMZM and filtering by an optical band-pass filter; and because the signal after down-conversion and filtering is the single sideband, make the signal in the long distance optical fiber transmission process, be difficult for the influence of the power fading effect that the optical fiber dispersion caused.
The full-duplex communication method using radio frequency self-interference cancellation shown in fig. 1 is as follows:
the method comprises the following steps: the laser is used to output an optical signal, here for convenience of explanation, at an angular frequency of ω0Amplitude of E0The optical signal of (2) is analyzed as an example. The optical signal output by the laser can be expressed as:
the optical signal is used as an optical carrier of the DP-DPMZM modulator; after the optical signal enters the DP-DPMZM modulator, the power equally divides into the upper and lower sub-DPMZMs with orthogonal polarization of the DP-DPMZM modulator, namely the X-DPMZM and the Y-DPMZM.
Step two: the radio frequency signal output by the radio frequency source 1 is used as an intermediate frequency signal (IF), the radio frequency signal output by the radio frequency source 2 is used as a local oscillation signal (LO), and the electro-optical conversion, the filtering of the optical band-pass filter 1 and the photoelectric conversion of PD1 are carried out through the X-DPMZM, so that the up-conversion of the baseband intermediate frequency signal by the system is realized for signal transmission. For ease of illustration, at angular frequencyIs omegaIFVoltage amplitude of VIFAs an intermediate frequency signal at an angular frequency of ωLOVoltage amplitude of VLOThe radio frequency signal of (a) is analyzed as an example of a local oscillator signal. At this time, the rf signals output by the rf source 1 and the rf source 2 can be respectively expressed as:
VIF(t)＝VIF cosωIFt (2)
VLO(t)＝VLO cosωLOt (3)
step three: the radio frequency signals generated by the radio frequency source 1 and the radio frequency source 2 are used as the radio frequency driving signal of the X-DPMZM on the upper circuit of the DP-DPMZM modulator, and the output signal after the X-DPMZM modulation is the RF driving signal of the X-DPMZM
Wherein the content of the first and second substances,
modulation depth, V, of intermediate frequency and local oscillator signals, respectivelyπIs a half-wave voltage, theta1、θ2、θ3The phase changes caused by the DC bias points DC1, DC2, and DC3, respectively.
Wherein VDC1、VDC2、VDC3The amplitude values of the three applied dc bias voltages.
By expanding the above equation with a Bessel function, the output light field of the X-DPMZM can be represented as
Wherein Jn(m) is a first class of nth order Bessel functions. By controlling VDC1、VDC2、VDC3Let θ1＝θ2＝π，θ 32 pi, putting two sub-MZMs of an X-DPMZM in a carrier-suppressed double sideband modulation state. Under small signal modulation, considering only the optical sidebands below the second order, the optical field of the X-DPMZM output can be represented as
Step four: after filtering by OBPF1, the +1 order sideband of modulated IF signal and-1 order sideband of LO signal are retained and beat frequency is obtained by photodetector 1
Then the signal is divided into two paths by a power divider (16), wherein one path is used as a transmitting signal to be transmitted;
step five: after passing through an electric phase shifter (14) and an electric attenuator (15), a reference signal is coupled with a local oscillation signal output by a radio frequency source 2(2) through an electric coupler (17) to be used as a radio frequency driving signal of one sub MZM of the Y-DPMZM, a signal received by a receiving antenna is used as another radio frequency source to be used as a radio frequency driving signal of the other sub MZM of the Y-DPMZM, the received signal comprises a signal of interest and an interference signal, and for convenience of description, the angular frequency is omegamVoltage amplitude of VSOIThe radio frequency signal of (a) is a signal of interest (SOI) in the received signal, and the angular frequency is ωmVoltage amplitude of VSiThe radio frequency signal of (2) is an interference signal (Si) in the received signal, and the angular frequency is omegamVoltage amplitude of VSrThe radio frequency signal of (1) is a reference signal (Sr), wherein the reference signal is delayed in time by tau after passing through an electrical phase shifter, and for the sake of distinction, the time amount of the reference signal is denoted by t', and the three signals can be respectively denoted as
VSOI(t)＝VSOI cosωmt (8)
VSi(t)＝VSi cosωmt (9)
VSr(t)＝VSr cos(ωmt'+τ) (10)
Step six: the output signal after Y-DPMZM modulation is
Wherein
Modulation depth, V, for the signal of interest, the interference signal and the reference signal, respectivelyπIs a half-wave voltage, theta4、θ5、θ6The phase changes caused by the DC bias points DC4, DC5, and DC6, respectively.
Wherein VDC4、VDC5、VDC6The amplitude values of the three applied dc bias voltages.
The above formula is unfolded by a Bessel function to obtain
Wherein Jn(m) is a first class of nth order Bessel functions. By controlling VDC4、VDC5、VDC6To make
θ6Pi, put the two sub-MZMs of the Y-DPMZM in a quadrature bias state. Under small signal modulation, high order sidebands of second order and above are ignored, and J of Bessel function is utilizedn(m)＝-J-n(m) characteristic, the optical field output by the Y-DPMZM is
The main direct current bias point, the electric phase shifter and the electric attenuator of the Y-DPMZM are controlled, so that the amplitude of the reference signal is matched with that of the interference signal, the phase difference is 180 degrees, and mutual cancellation is realized, namely, the following conditions are met
J0(mSOI)J1(mSi)＝J0(mLO)J1(mSr)，ωmt＝ωmt'+τ (14)
The output after cancellation is
Step seven: the +1 order sideband of the signal of interest and the +1 order sideband of the local oscillation signal are reserved by the optical band-pass filter 2 and are obtained by beat frequency of the photoelectric detector 2
Therefore, the invention realizes signal transmission by up-conversion of the intermediate frequency signal; the elimination of the radio frequency self-interference signal of the system is realized by controlling the main direct current bias point, the electric phase shifter and the electric attenuator of the Y-DPMZM; meanwhile, the down-conversion and the single-sideband filtering of the received signal realize the suppression of the power fading effect caused by the optical fiber dispersion in the optical fiber transmission.
In summary, the present invention provides a full-duplex communication system and method for radio frequency self-interference cancellation, which solve the problems of single function and incapability of long-distance optical fiber transmission in the existing method, and simultaneously realize transmit-receive integration and radio frequency self-interference cancellation.
Claims (2)
1. A full duplex communication system with radio frequency self-interference cancellation, comprising: the optical fiber polarization splitter comprises a radio frequency source 1(1), a radio frequency source 2(2), a laser (3), a polarization controller PC (4), a polarization-maintaining optical fiber branching unit (5), a dual-polarization dual-parallel Mach-Zehnder DP-DPMZM modulator (6), a polarization beam splitter PBS (7), an OBPF1 optical band-pass filter 1(8), a PD1 photoelectric detector 1(9), an OBPF2 optical band-pass filter 2(10), an EDFA optical fiber amplifier (11), an SMF single-mode fiber (12), a PD2 photoelectric detector 2(13), an electric phase shifter (14), an electric attenuator (15), a power divider (16) and an electric coupler (17);
the radio frequency source 1(1) is used for providing an intermediate frequency signal, and the intermediate frequency signal is used for signal transmission;
the radio frequency source 2(2) is used for providing local oscillation signals for frequency conversion of the signals;
the laser (3) is used for providing an optical carrier wave of the DP-DPMZM modulator;
the power divider (16) is used for providing two paths of signals, one path is a transmitting signal, the other path is a reference signal, and the reference signal is used for offsetting an interference signal;
the output end of the laser (3) is connected with the input end of the polarization controller (4), and the output end of the polarization controller (4) is connected with the input end of the polarization-maintaining optical fiber branching unit (5); the optical carrier is divided into two paths by a polarization maintaining fiber branching unit (5), wherein one output end is connected with the optical input end of an upper path X-DPMZM of the DP-DPMZM modulator, and the other output end is connected with the laser input end of a lower path Y-DPMZM of the DP-DPMZM modulator;
an upper X-DPMZM of the DP-DPMZM modulator is provided with two radio frequency input ports, and a radio frequency signal output by a radio frequency source 1(1) is connected with one radio frequency input end of the X-DPMZM as an intermediate frequency signal (IF); the radio frequency signal output by the radio frequency source 2(2) is used as a local oscillator signal (LO) to be connected with the other radio frequency input end of the X-DPMZM;
the lower Y-DPMZM of the DP-DPMZM modulator is provided with two radio frequency input ports; a reference signal divided by the power divider (16) passes through the electric phase shifter (14) and the electric attenuator (15) in sequence, is coupled with a local oscillation signal output by the radio frequency source 2(2) through the electric coupler (17), and is used as a radio frequency source to be connected with one radio frequency input end of the Y-DPMZM; a signal received by the receiving antenna is used as another radio frequency source to be connected with the other radio frequency input end of the Y-DPMZM;
the output end of the DP-DPMZM modulator (6) is connected with the input end of the polarization beam splitter (7); the modulation signal modulated by the DP-DPMZM modulator is divided into two paths by a polarization beam splitter (7), wherein one path of output end is sequentially connected with a photoelectric band-pass filter 1(8) and a photoelectric detector 1(9) through optical fibers, and the output end of the photoelectric detector 1(9) is connected with the input end of a power divider (16) through a cable; the power divider (16) has two paths of outputs, one of which is a transmitting signal, and the output end is connected with a transmitting antenna; the other path of output of the power divider (16) is used as a reference signal; the other output end of the polarization beam splitter (7) is connected with the optical band-pass filter 2(10), the optical fiber amplifier (11), the single-mode optical fiber (12) and the photoelectric detector 2(13) in sequence through optical fibers, and the photoelectric detector 2(13) outputs a receiving signal after interference elimination.
2. A full-duplex communication method for radio frequency self-interference cancellation, based on the full-duplex communication system for radio frequency self-interference cancellation of claim 1, comprising the following steps:
step 1: an optical signal output by the laser (3) passes through the polarization controller (4) and then is divided into two paths by the polarization-maintaining fiber branching unit (5), and the two paths respectively enter an X-DPMZM path and a Y-DPMZM path of the DP-DPMZM modulator and are used as optical carriers of the DP-DPMZM modulator.
Step 2: inputting an intermediate frequency signal sent by a radio frequency source 1(1) into one sub MZM of the X-DPMZM path, and inputting a local oscillator signal sent by a radio frequency source 2(2) into the other sub MZM of the X-DPMZM path;
and step 3: controlling three direct current bias voltages of the X-DPMZM to enable signals output by two sub MZMs to be in a carrier suppression double-sideband modulation state;
and 4, step 4: the +1 order sideband of an intermediate frequency signal output by a radio frequency source 1(1) and the-1 order sideband of a local oscillation signal output by a radio frequency source 2(2) are reserved through an OBPF1(8), and are divided into two paths by a power divider (16) after being subjected to beat frequency by a photoelectric detector 1(9), wherein one path is used as a transmitting signal to be transmitted, and the other path is used as a reference signal;
and 5: after passing through an electric phase shifter (14) and an electric attenuator (15), a reference signal and a local oscillation signal output by a radio frequency source 2(2) are coupled by an electric coupler (17) and then input into one sub MZM of the Y-DPMZM together, and a signal received by a receiving antenna is input into the other sub MZM of the Y-DPMZM as another radio frequency source, wherein the received signal comprises a signal of interest and an interference signal;
step 6: the amplitude of a reference signal is matched with that of an interference signal through controlling a main direct current bias voltage, an electric phase shifter and an electric attenuator of the Y-DPMZM, and the phase difference is 180 degrees, so that mutual cancellation is realized, wherein two sub MZMs of the Y-DPMZM are positioned at an orthogonal bias point through controlling three direct current bias voltages of the Y-DPMZM;
and 7: the +1 order sideband of the signal of interest and the +1 order sideband of the local oscillation signal are reserved through the OBPF2(10), and then after sequentially passing through the optical fiber amplifier (11) and the single mode optical fiber (12), the received signal after interference elimination is obtained through beat frequency of the photoelectric detector 2 (13).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113810111A (en) * | 2021-07-28 | 2021-12-17 | 中国人民解放军空军工程大学 | Optical image interference, self-interference suppression and optical fiber transmission integrated device and method |
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| CN114629559A (en) * | 2022-03-17 | 2022-06-14 | 西北工业大学 | Simultaneous image interference suppression and self-interference cancellation device based on Sagnac loop and adjusting method |
| CN114629559B (en) * | 2022-03-17 | 2024-02-06 | 西北工业大学 | Simultaneous image interference suppression and self-interference cancellation device based on Sagnac loop and adjustment method |
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| CN115037380B (en) * | 2022-08-10 | 2022-11-22 | 之江实验室 | Amplitude-phase-adjustable integrated microwave photonic mixer chip and control method thereof |
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