CN114584222A - Microwave photon down-conversion method for function multiplexing - Google Patents

Microwave photon down-conversion method for function multiplexing Download PDF

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CN114584222A
CN114584222A CN202210077013.3A CN202210077013A CN114584222A CN 114584222 A CN114584222 A CN 114584222A CN 202210077013 A CN202210077013 A CN 202210077013A CN 114584222 A CN114584222 A CN 114584222A
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dpmzm
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杨登才
邬福正
杨峰
王云新
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Beijing University of Technology
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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
    • H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
    • 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
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
    • 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
    • H04B10/5161—Combination of different modulation schemes
    • 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
    • H04B10/54—Intensity modulation
    • H04B10/541—Digital intensity or amplitude modulation
    • 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
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
    • H04B10/5561—Digital phase modulation
    • 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
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
    • H04B10/5563—Digital frequency modulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a microwave photon down-conversion method for function multiplexing, which comprises a laser, an electric coupler, a power divider, dual-polarization quadrature phase shift keying and the like. Radio frequency self-interference elimination is realized by adjusting the bias voltage working point of the X-DPMZM and optimizing the electric delayer and the electric attenuator of the loaded SR branch; in the LO loading branch circuit, the reconfigurable local oscillator frequency multiplication down conversion is realized by adjusting the working point of the Y-DPMZM bias voltage; DP-QPSK output orthogonal polarization sideband signals are filtered out of one side sideband through OBPF, polarization phase shift is conducted through PC and POL, and mirror image suppression is achieved through photoelectric detection and 90-degree HC coupling.

Description

Microwave photon down-conversion method for function multiplexing
Technical Field
The invention provides a microwave photon down-conversion method based on dual-polarization quadrature phase shift keying (DP-QPSK) and capable of eliminating radio frequency self-interference and image rejection, local oscillator frequency doubling is reconfigurable, and the method belongs to the field of microwave photon signal processing.
Background
Microwave photon technology is a science combining microwave technology and photon technology. The microwave signal is processed by an optical method, and the high-frequency signal can be directly processed in an optical domain, wherein the processing comprises the generation, filtering, frequency conversion and the like of the microwave signal. Because the photon technology has the advantages of large bandwidth, low loss, electromagnetic interference resistance and the like, the microwave photonic link solves the problem that some traditional microwave technologies are difficult to realize.
Along with the continuous development of communication technology, the problem of spectrum resource shortage is increasingly highlighted, and in order to solve the problem, a simultaneous same-frequency full duplex technology is provided, and compared with a frequency division half duplex technology, the frequency spectrum utilization rate can be effectively improved. However, an effective implementation of this scheme must solve the problem of suppression of its own radio frequency self-interference and image interference signals.
Firstly, the problem of self-interference of radio frequency signals is that in the process of transmitting and receiving signals, a receiver receives a far-end weak co-frequency downlink signal which is seriously affected by a near-end high-power transmission signal, so that a method for eliminating the self-interference signals is necessary. Secondly, the image interference means that in the signals received by the antenna end, not only target signals required by the system are included, but also image signals symmetrical to the target signals about the local oscillation frequency exist, the intermediate frequency same as the target signals can be obtained after down-conversion, and based on the principle of detector intensity detection, the two signals cannot be distinguished to interfere the target signal reception. Rejection of the image signal is a particularly important part of the microwave photon down conversion chain.
In microwave photonic systems using simultaneous co-frequency full duplex technology, the problems of radio frequency self-interference and image signal interference are simultaneous. It is important to realize the methods of eliminating the radio frequency self-interference and image rejection simultaneously. In the actual signal transmission process, a higher frequency band is often used, so that the frequency requirement of the local oscillation signal of the receiving end is improved.
Disclosure of Invention
The invention provides a microwave photon down-conversion method based on a dual-polarization quadrature phase shift keying modulator, which can simultaneously realize elimination of radio frequency self-interference, image rejection and local oscillator frequency doubling reconstruction and is a multifunctional integrated microwave photon link.
The device comprises a laser LD, an electric delayer ETDL, an electric attenuator EATT, a dual-polarization quadrature phase shift keying modulator DP-QPSK, an optical filter OBPF, an optical coupler OC, a PC1 polarization controller 1, a PC2 polarization controller 2, a Pol1 polarizing piece 1, a Pol2 polarizing piece 2, a PD1 photoelectric detector 1, a PD2 photoelectric detector 2 and a 90-degree electric bridge, namely a 90-degree HC.
The DP-QPSK comprises a Y-type optical beam splitter, two double-parallel Mach modulators which are connected in parallel up and down and are marked as an X-DPMZM and a Y-DPMZM, a 90-degree polarization rotator PR and a polarization beam combiner PBC. The X-DPMZM and the Y-DPMZM have three bias voltage ports, respectively.
The local oscillator frequency doubling reconfigurable microwave photon down-conversion scheme capable of eliminating radio frequency self-interference and image rejection simultaneously comprises the following specific processes:
inputting an optical signal output by a laser into DP-QPSK as an optical carrier; in the upper branch of DP-QPSK, interference signal, image signal and radio frequency signal are loaded on MZM1 in X-DPMZM, and the bias voltage is adjusted to make it work at the minimum intensity output point; the reference signal is loaded to MZM2 in the X-DPMZM, and the X-DPMZM is also enabled to work at the minimum intensity output point; in order to realize radio frequency self-interference elimination, firstly, a 180-degree phase difference is generated between an interference signal SI and a reference signal SR which are input into an upper sub MZM and a lower sub MZM by adjusting a main bias voltage of the X-DPMZM, and the interference signal and the reference signal have the same strength and are matched in time delay by adjusting an electric attenuator and an electric delayer of a branch of the reference signal SR, so that the interference signal and the reference signal can be mutually offset by meeting three conditions. The signal output by the X-DPMZM is a carrier-suppressed double sideband (CS-DSB) modulated signal, carrying the desired radio frequency signal and an image signal. In the other branch Y-DPMZM of the DP-QPSK modulator, two paths of signals with the same strength and 90-degree phase difference are generated by a local oscillator signal LO through a 90-degree HC and are respectively input into the MZM3 and the MZM4, and the reconfiguration of a local oscillator signal frequency doubling sideband can be realized by adjusting bias voltage. Firstly, adjusting bias voltages of MZM3 and MZM4 to enable the MZM3 and the MZM4 to work at a maximum intensity output point; adjusting the main bias voltage of the Y-DPMZM to enable the main bias voltage to work at a minimum intensity output point to obtain a carrier-suppressed local oscillation signal second-order sideband; in addition, two sub MZMs of the Y-DPMZM are arranged at a minimum intensity output point, a main bias voltage is arranged at a quadrature transmission point, and a carrier-suppressed local oscillation signal +1 and a-3 order sideband are obtained. The Y-DPMZM output signal is coupled with the X-DPMZM output signal through 90 DEG PR through PBC to obtain an orthogonal polarization signal. Then, the output signal of the DP-QPSK modulator is input into an optical filter, a local oscillation signal-2 order or-3 order side band signal is filtered out according to the actual requirements of down-conversion, the local oscillation signal is divided into two paths with equal strength through an optical coupler, different phase shift control is carried out on the two paths of signals through a PC and a POL respectively, the two paths of signals through rotation of the PC, an intermediate frequency signal is output after PD beat frequency, the phases of the two paths of mirror image intermediate frequency signals are 180 degrees apart and offset with each other after 90-degree HC coupling, the phases of the two paths of mirror image intermediate frequency signals are the same, the two paths of mirror image intermediate frequency signals are superposed, and the required intermediate frequency signal is finally output, so that the local oscillation signal reconfigurable down-conversion with radio frequency self-interference elimination and mirror image rejection is realized.
The invention has the beneficial effects that: the multifunctional integrated microwave photon down-conversion structure provided by the invention can meet the simultaneous use of any single function or multiple functions; the problem that radio frequency self-interference elimination and image suppression are required to be realized simultaneously in a simultaneous same-frequency full-duplex technology center is solved; and the local oscillator signal frequency doubling and frequency tripling can be reconstructed, so that the requirement on the local oscillator signal frequency in the actual use process is reduced, and the method can be widely applied to multiple fields of wireless communication, radar and the like.
Drawings
Fig. 1 is a schematic diagram of a local oscillator frequency doubling reconfigurable microwave photon down-conversion link structure with radio frequency self-interference elimination and image rejection.
FIG. 2(a) is a front-back spectrogram of a second-order sideband of a filtered local oscillator signal
FIG. 2(b) is a front-back spectrogram of a filtered local oscillator signal with a third-order sideband
FIG. 3(a) is a spectrum diagram of a local oscillator frequency doubling RF self-interference before image rejection
FIG. 3(b) is a spectrum diagram of the local oscillator frequency doubling RF after self-interference and image rejection
FIG. 4(a) is a spectrum diagram before local oscillator triple frequency multiplication radio frequency self-interference and image rejection
FIG. 4(b) is a spectrum diagram of the local oscillator triple frequency multiplication radio frequency after self-interference and image rejection
Detailed Description
The invention is further described herein with reference to the accompanying drawings and mathematical derivations:
fig. 1 shows a local oscillator frequency doubling reconfigurable microwave photon down-conversion link structure with simultaneous radio frequency self-interference elimination and image rejection, which includes a laser, four signal sources, an electric coupler, a power divider, an electric delayer, an electric attenuator, dual-polarization quadrature phase shift keying, an optical filter, an optical coupler, a polarization controller 1, a polarization controller 2, a polarization optical sheet 1, a polarization optical sheet 2, a photoelectric detector 1, a photoelectric detector 2, and a 90-degree electric bridge.
The local oscillator frequency doubling reconfigurable microwave photon down-conversion method with simultaneous radio frequency self-interference elimination and image rejection shown in fig. 1 is as follows:
the laser outputs an optical signal, and for convenience of explanation, the angular frequency of the optical signal output by the laser is assumed to be ω0Amplitude of E0Then the output optical signal is expressed as
Figure BDA0003484500470000031
After the optical signal enters the DP-QPSK modulator, the power of the optical signal is equally divided into an upper sub DPMZM and a lower sub DPMZM of the DP-QPSK modulator. Setting a useful signal (RF), an interference Signal (SI), an image signal (IM) and a reference Signal (SR) loaded on the X-DPMZM and a local oscillator signal (LO) loaded on the Y-DPMZM as
Figure BDA0003484500470000032
In the formula, ViAnd ωiThe amplitude and angular frequency of the i (i ═ RF/SI/IM/SR/LO) signal, respectively. The output signal of the X-DPMZM may be expressed as
Figure BDA0003484500470000041
Wherein m isi＝πVi/VπModulation depth, V, for RF, SI, IM, SR, LO signals, respectivelyπA half-wave voltage for the DP-QPSK modulator to work. Thetan＝πVn/Vπ(n ═ 1,2.. 6) is a bias voltage VnPhase difference, V, between two introduced sub-MZMsn(n-1, 2.. 6) corresponds to bias voltages of DC1-DC6, respectively.
The method comprises the following steps: and adjusting the bias voltage of the two sub MZMs on the X-DPMZM to work at the minimum intensity output point. Thus, θ1＝θ2The expression of the optical signal which can be obtained by expanding the output of the X-DPMZM by a Bessel function equation is as follows
Figure BDA0003484500470000042
Wherein Jn(. cndot.) is an n-th order Bessel function of the first kind, with only first order sidebands retained according to the small signal approximation principle. In order to realize radio frequency self-interference elimination, an electric delayer and an electric attenuator are adjusted to satisfy t ═ t' + tau and J1(mSR)＝J0(mRF)J1(mSI)J0(mIM) Namely the interference signal is matched with the reference signal in phase and has the same strength, and in addition, the phase difference of the output signals of the upper and lower sub MZMs is 180 degrees by adjusting the main bias voltage of the X-DPMZM, namely theta is equal to theta3When the SR signal and the SI signal are mutually counteracted to realize the radio frequency self-interference elimination, the expression of an X-DPMZM output signal is
Figure BDA0003484500470000043
Step two: in the Y-DPMZM branch, two paths of signals with the same intensity and 90-degree phase difference generated by a local oscillator signal (LO) through a 90-degree HC (hybrid resonance frequency) are respectively input into two sub MZMs, and an output signal of the Y-DPMZM can be expressed as
Figure BDA0003484500470000044
In order to realize local oscillation signal frequency multiplication and reconstruction, Y-DPMZM bias voltage needs to be adjusted to enable the Y-DPMZM bias voltage to work in different states. Firstly, the working points of the two sub MZMs are set at the maximum intensity output point, the main bias voltage is set at the minimum intensity output point, namely theta4＝θ5＝2π，θ6At this point we can get the second order sidebands of the local oscillator signal with the carrier suppressed. The signal expression of the Y-DPMZM output obtained by the expansion of the Bessel function equation is
Figure BDA0003484500470000051
The +2 and-2 order sidebands of the local oscillator signal can be obtained by the formula (7).
If two sub-MZMs of a Y-DPMZM are set to the minimum intensity output point, the main bias voltage is set to the quadrature transmission point, i.e., θ4＝θ5＝π θ6At this time we can get the LO signal +1 with the carrier suppressed and the-3 order sidebands. The signal expression of the Y-DPMZM output obtained by the expansion of the Bessel function equation is
Figure BDA0003484500470000052
The +1 and-3 order sidebands of the local oscillator signal can be obtained by the formula (8).
Step three: when the bias voltage of the Y-DPMZM is controlled to obtain a second-order sideband of a local oscillation signal, an output optical signal of the Y-DPMZM passes through the 90-degree PR and is coupled with an output optical signal of the X-DPMZM through the PBC to be output, the output optical signal enters the OBPF, and the sideband at the-2-order side of the local oscillation signal is filtered. The output optical signal is expressed as
Figure BDA0003484500470000053
Step four: the output optical signal enters the OC and is divided into I, Q paths with equal strength, the two paths have the same structure and are respectively input into the PD for beat frequency through the PC and the POL. Adjusting PC, adopting polarization phase shift mode to make two optical signals produce different phase difference thetaI＝0,θQPi/2, the signal obtained is expressed by
Figure BDA0003484500470000054
Figure BDA0003484500470000055
Step five: finally, two paths of intermediate frequency signals are coupled through 90-degree HC, phase difference of 180 degrees between two paths of image intermediate frequency signals is achieved, image rejection is completed, and the expression of an output signal is
Figure BDA0003484500470000056
Adjusting the bias voltage of the Y-DPMZM, selecting a-3-order sideband of an LO signal under the working state of local oscillator signal triple frequency multiplication, repeating the derivation from the third step to the fifth step, and obtaining an expression of image suppression output as
Figure BDA0003484500470000061
In summary, as can be seen from the equation (5) in the step one, the interference signal and the reference signal cancel each other, so as to achieve radio frequency self-interference cancellation; the second frequency doubling and the third frequency doubling of the local oscillation signal can be reconstructed by setting the bias voltage of the Y-DPMZM in the second step; according to the formulas (12) and (13) in the fifth step, the two paths of images are mutually offset by a polarization phase shifting method, and the image rejection down-conversion is completed. And the formulas (12) and (13) prove that the reconfigurable image suppression down-conversion based on local oscillator signal frequency multiplication is realized, and the system is proved to be a local oscillator frequency multiplication reconfigurable multifunctional integrated microwave photon down-conversion system with the functions of simultaneously eliminating radio frequency self-interference and suppressing image.

Claims (1)

1. A microwave photon down-conversion method with function multiplexing, a local oscillation frequency doubling reconfigurable microwave photon down-conversion method for eliminating radio frequency self-interference and image rejection simultaneously, based on a reconfigurable microwave photon down-conversion link structure, the structure comprises a laser LD, an electric time delay device ETDL, an electric attenuator EATT, a dual-polarization quadrature phase shift keying modulator DP-QPSK, an optical filter OBPF, an optical coupler OC, a PC1 polarization controller 1, a PC2 polarization controller 2, a Pol1 polarization piece 1, a Pol2 polarization piece 2, a PD1 photoelectric detector 1, a PD2 photoelectric detector 2, a 90-degree electric bridge, namely 90-degree HC, wherein the DP-QPSK comprises a Y-type optical beam splitter, two dual-parallel Mach modulators which are connected in parallel up and down, and are marked as X-DPMZM and Y-DPMZM, a 90-degree polarization rotator PR and a polarization beam combiner PBC, the X-DPMZM is provided with three bias voltage ports DC1, DC2, DC3, Y-DPMZM has three bias voltage ports DC4, DC5, DC6, X-DPMZM includes two Mach-Zehnder modulators MZM1 and MZM2, Y-DPMZM includes two Mach-Zehnder modulators MZM3 and MZM4, Y type optical beam splitter is divided into upper and lower two paths with equal intensity of optical carrier wave input to DP-QPSK, Y-DPMZM output optical signal rotates 90 degree through PR polarization state, then outputs through PBC coupling with X-DPMZM output signal, DP-QPSK modulates microwave signal received by antenna onto optical carrier wave, microwave signal received by antenna includes radio frequency signal RF, interference signal SI, image signal IM, also modulates reference signal SR applied to interference cancellation and local oscillator signal LO used for frequency conversion onto optical carrier wave,
the method is characterized by comprising the following steps:
step 1, inputting an optical signal output by a laser into DP-QPSK as an optical carrier; in an upper branch X-DPMZM of DP-QPSK, an interference signal SI, an image signal IM and a radio frequency signal RF are loaded on MZM1 in the X-DPMZM, and the bias voltage of MZM1 is adjusted to work at the minimum intensity output point; the reference signal SR is loaded on MZM2 in the X-DPMZM, and the bias voltage of MZM2 is also adjusted to work at the minimum intensity output point; the method comprises the steps that a 180-degree phase difference is generated between an interference signal SI and a reference signal SR which are input into an upper sub MZM and a lower sub MZM, namely MZM1 and MZM2, by adjusting a main bias voltage of an X-DPMZM, and the strength and the phase of the interference signal SI and the reference signal SR meet a cancellation condition by adjusting an electric delayer ETDL and an electric attenuator EATT, so that the interference signal SI and the reference signal SR are cancelled mutually, and radio frequency self-interference elimination is realized; the signal output by the X-DPMZM is a carrier suppression double-sideband CS-DSB signal, and carries a required radio frequency signal and an image signal;
step 2, in a lower branch Y-DPMZM of the DP-QPSK modulator, two paths of signals with the same strength and 90-degree phase difference are generated by local oscillation signals through a 90-degree HC and are respectively input into MZM3 and MZM4, and the sideband reconfiguration of the local oscillation signals is realized by adjusting bias voltage; firstly, adjusting bias voltages of MZM3 and MZM4 to enable MZM3 and MZM4 to work at a maximum intensity output point, adjusting a main bias voltage of Y-DPMZM to enable Y-DPMZM to work at a minimum intensity output point, obtaining a second-order sideband of a local oscillation signal with carrier suppression, and combining a radio frequency signal sideband output by the X-DPMZM to realize double frequency down conversion of the local oscillation signal; in addition, two sub MZMs of the Y-DPMZM are set to work at a minimum intensity output point, a main bias voltage is set to work at an orthogonal transmission point, local oscillation signals +1 and-3 order sidebands of carrier suppression are obtained, and the local oscillation signal triple frequency down-conversion can be realized by combining the radio frequency signal sidebands output by the X-DPMZM; coupling the Y-DPMZM output signal with the X-DPMZM output signal through 90 DEG PR to obtain an orthogonal polarization signal;
and 3, inputting the output signal of the DP-QPSK modulator into an optical filter, filtering out a signal on one side of a second-order or third-order sideband of a local oscillation signal according to the actual requirement of down-conversion, dividing the signal into two paths with equal strength through an optical coupler, inputting the two paths of signals respectively through a PC (personal computer) and a POL (polar alcohol), performing different phase shift modulation on the two paths of signals through adjusting the PC, outputting two intermediate frequency signals with a phase difference of 90 degrees after PD (pulse Doppler) beat frequency, and coupling the two paths of image intermediate frequency signals through 90 degrees HC (hybrid harmonic oscillator) to ensure that the phase difference is 180 degrees and the two paths of image intermediate frequency signals are mutually offset, thereby realizing image rejection down-conversion.
CN202210077013.3A 2022-01-24 2022-01-24 Microwave photon down-conversion method for function multiplexing Pending CN114584222A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115225155A (en) * 2022-06-09 2022-10-21 北京工业大学 System and method for realizing multi-channel common carrier frequency phase coding based on array structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115225155A (en) * 2022-06-09 2022-10-21 北京工业大学 System and method for realizing multi-channel common carrier frequency phase coding based on array structure
CN115225155B (en) * 2022-06-09 2024-03-08 北京工业大学 System and method for realizing multichannel common carrier frequency phase coding based on array structure

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