CN105763266B - A Method for Simultaneous Downconversion and Phase Shifting of Microwave Photons - Google Patents
A Method for Simultaneous Downconversion and Phase Shifting of Microwave Photons Download PDFInfo
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- CN105763266B CN105763266B CN201610289164.XA CN201610289164A CN105763266B CN 105763266 B CN105763266 B CN 105763266B CN 201610289164 A CN201610289164 A CN 201610289164A CN 105763266 B CN105763266 B CN 105763266B
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
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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
- H04B10/70—Photonic quantum communication
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Abstract
A kind of method for realizing microwave photon down conversion and phase shift simultaneously disclosed by the invention, this method comprises: double drive Mach-Zehnder modulators (DMZM), Bragg grating (FBG), optical circulator (OC), photodetector (PD), laser source.By the way that radiofrequency signal and local oscillation signal to be loaded into the microwave signal interface of the two-arm up and down of DMZM respectively, Dc bias is loaded in DC interface.The single order sideband of FBG reflected radio-frequency signal and local oscillation signal.After PD, the available recovery of intermediate-freuqncy signal realizes intermediate-freuqncy signal phase-shift operations by adjusting the bias of DMZM or the wavelength of control laser.
Description
Technical field
The present invention relates to a kind of methods of microwave photon frequency conversion phase shift, and more particularly, it relate to microwave photon down conversions
With the combination of microwave photon phase shift technology.
Background technique
In recent years, Microwave photonics are the rapid ambits of development, Microwave photonics study microwave and
The interaction of light wave is generated using photon technology, processing, controls and transmit microwave/millimeter wave signal, and thus established
The various transmission links and information processing technology microwave photon link to get up have transmission capacity big, and electromagnetism interference does not pass
The advantages such as the electricity bottleneck of system.Microwave photonics are communicating, and sensing, the fields such as national defence suffer from very important application.In phase
It controls in array beam forming net and codiphase radar system, realizes that 360 degree of Phaseshift controllings are one of them important functions.Accordingly
, the radiofrequency signal received, which is also required to be down-converted to intermediate-freuqncy signal just, can be carried out the processing of next step.
The scheme of several kinds of microwave photon down conversions has been proposed at present, and professor Gopalakrishnan is using series connection two
Mach-Zehnder modulators realize down coversion.By the way of series phase modulator and Bragg fibre grating filters,
Down conversion system can be made more to linearize by controlling local oscillation signal.It can with phase-modulator combination Sagnac loop structure
So that down coversion transfer efficiency with higher.Using two way phase modulator and balance photodetector, may be implemented
The down coversion of high carrier-to-noise ratio.
All schemes above-mentioned all only only realize down coversion or the one of function of phase shift, there is presently no
The scheme for proposing down coversion and phase shift while realizing.
Summary of the invention
It is an object of the invention to propose method that is a kind of while realizing microwave photon down conversion and phase shift.This method is available
In the demodulation of phased array beam forming net, codiphase radar system and vector.
According to the present invention, provide it is a kind of can frequency conversion and phase shift simultaneously method.It is so-called while realizing frequency conversion and phase shift, refer to
Be by during realizing down coversion, using the modulating characteristic of DMZM, while realizing shifting using the devices such as DMZM and FBG
The function of phase.
Realization process of the invention specifically includes: radiofrequency signal and local oscillation signal are loaded into the two-arm up and down of DMZM respectively
Microwave signal interface, Dc bias are loaded in DC interface.The single order sideband of FBG reflected radio-frequency signal and local oscillation signal.By
After PD, the available recovery of intermediate-freuqncy signal realizes intermediate-freuqncy signal phase by adjusting the bias of DMZM or the wavelength of control laser
The accurate phase-shift operations of 0 degree to 360 degree of position.
Detailed description of the invention
By the description to embodiment carried out with reference to the accompanying drawing, objects and advantages of the present invention will become more clear
Chu, in which:
Fig. 1 shows microwave photon frequency conversion phase-shift system structure chart；
Fig. 2 shows systems by the spectrogram before and after FBG；
Fig. 3 shows waveform diagram of the system after detector (PD), (a) plus different biass, (b) adds different wave length；
Fig. 4 shows the phase response figure under different Dc biases；
Fig. 5 shows intermediate-freuqncy signal intensity response figure under different phase shifts；
Fig. 6 shows phase shift and changes with time figure.
Specific embodiment
Embodiments of the present invention are described in detail below in conjunction with attached drawing.
Fig. 1 illustrates microwave photon frequency conversion phase-shift system structure chart, and wherein S101 is tunable laser, inputs light carrier
Each arm to double drive Mach-Zehnder modulators S102, S102 can regard a phase-modulator, S103 radio frequency letter as
Number and S104 local oscillation signal be added in the microwave interface of S102 two-arm respectively, the direct current that S105 DC offset voltage is added in S102 connects
At mouthful, the optical signal exported from S102 enters S107 bragg grating by S106 optical circulator, due to the transmission of S107
And reflex, light carrier and useless optics sideband are filtered out, and are reflected back the single order sideband of signal, are finally visited by S108
It surveys device and obtains intermediate-freuqncy signal.
The theory analysis of system is as follows: S103 radiofrequency signal of the load on S102 double drive Mach-Zehnder modulators
With the optical signal expression formula of S104 local oscillation signal are as follows:
Wherein, P0Represent the power of S101 laser, w0The frequency of light carrier is represented,For the upper arm tune of S102
Depth processed,For the lower arm modulation depth of S102, VRFAnd VLORepresent the width of S103 radiofrequency signal and S104 local oscillation signal
Degree, V π is the half-wave voltage of S102.ωRFAnd ωLOFor the frequency of S103 and S104, θ is the phase difference of upper lower arm.S102's is defeated
The expression formula of optical signals are as follows:
According to Bezier (Jacobi-Anger) expansion, can indicate are as follows:
Since the frequency of the intermediate-freuqncy signal after down coversion forms ωIF=ωRF-ωLO, only and S103 and S104 single order side
With related, pass through S106 optical circulator in this way and S107 bragg grating filters the light carrier side unrelated with other
Band, and the single order sideband of signal is reflected back, the single order sideband expression formula of radiofrequency signal and local oscillation signal are as follows:
Then the single order sideband reflected passes through S108 detector beat frequency, and the signal of output can indicate are as follows:
I (t)=P0RJ1(β1)J1(β2)cos(ωIFt+θ)
It can be seen that signal changes to intermediate-freuqncy signal by radiofrequency signal.More importantly it can achieve intermediate frequency by adjusting θ
The variation that 0 degree to 360 degree of signal phase.The adjusting of phase can indicate are as follows:
Wherein, VDCIt is the DC offset voltage of S102.By fixed light carrier, V is adjustedDCIt can change θ.Due to θ and swash
Light device wavelength is directly proportional, can also pass through fixed VDC, laser wavelength is adjusted to change θ.
Fig. 2 shows that signal passes through the spectrogram before and after bragg grating S107, before S201 is by S107 in figure
Spectrogram, S202 is spectrogram after.The set of frequency of microwave signal is 15.5GHz, and the frequency of local oscillation signal is set as
16GHz.The central wavelength of S107 is adjusted to 1550.23nm, the single order sideband of only microwave signal and local oscillation signal is reflected
Link is returned, light carrier and other sidebands are inhibited by 36dB.The phase difference of microwave signal and local oscillation signal corresponds to output intermediate frequency
The phase of signal can be changed by adjusting Dc bias and laser wavelength.
Fig. 3 (a), which is shown in experiment, loads the waveform diagram under different DC biased voltage to S102, can significantly find out
Down coversion and phase shift are accomplished simultaneously.2V is changed to from 0 by adjusting bias voltageπ, can successfully obtain 0 degree of phase and arrive
360 degree of variation.Fixed bias voltage, different phase shifts can also be realized by changing the wavelength of laser.Fig. 3 (b) is aobvious
Show by adjusting the wavelength of S101 laser, same available 0 degree to 360 degree of phase shift variations.
Fig. 4 shows the response condition of phase at different frequencies, can be readily apparent that frequency is 12GHz to 20GHz
When, phase is very stable.By adjusting the DC offset voltage of S102, the phase of intermediate-freuqncy signal can change to 360 from 0 degree
Degree, error range is less than 2 degree.
Fig. 5 shows when the phase change of intermediate-freuqncy signal, the intensity response of intermediate-freuqncy signal radio frequency signal frequency variation.
Fig. 5 (b) is intermediate-freuqncy signal when phase shift is 45 degree, with the Strength Changes of different frequency；Fig. 5 (d) is that intermediate-freuqncy signal is in phase shift
At 135 degree, with the Strength Changes of different frequency；Fig. 5 (f) is intermediate-freuqncy signal when phase shift is 225 degree, with the intensity of different frequency
Variation；Fig. 5 (h) is intermediate-freuqncy signal when phase shift is 315 degree, with the Strength Changes of different frequency；Show the intensity of reception signal
Very big fluctuation does not occur with the variation of phase, is less than 1dB, is acceptable.
Fig. 6 shows the stability of phase at any time, and by radiofrequency signal setting in 15.5GHz, local oscillation signal setting exists
16GHz.By adjusting bias by 45 degree of phase generation of variation, system is allowed to run a period of time in laboratory environment, we
It will be clear that phase fluctuation amount very little, shows that system has extraordinary stability.We can have found system from Fig. 6
Transfer efficiency, that is, the power ratio of output intermediate-freuqncy signal and input radio frequency signal, correspond to the β in Bessel function2Ginseng
Number.The variation come transfer efficiency is observed that by adjusting local oscillation signal, and experimental measurements show β2When=1.84,
The transfer efficiency of system reaches maximum.
Claims (4)
1. a kind of method for realizing microwave photon down conversion and phase shift simultaneously, feature includes the following contents:
Light carrier is generated using tunable laser；
It is used to modulated signal by double drive Mach-Zehnder modulators；
A filter is combined into using a Bragg grating and an optical circulator；
Photodetector beat frequency generates intermediate-freuqncy signal；
It is realized by controlling DC offset voltage or the control tunable laser wavelength of double drive Mach-Zehnder modulators
The phase shift operation of intermediate-freuqncy signal；
Microwave photon down conversion and phase shift operation are realized simultaneously；
Light carrier is inputted to double drive Mach-Zehnder modulators, each arm of double drive Mach-Zehnder modulators is ok
Regard a phase-modulator as, radiofrequency signal and local oscillation signal are added in the micro- of double drive Mach-Zehnder modulators two-arm respectively
Wave interface, DC offset voltage are added at the DC interface of double drive Mach-Zehnder modulators, once from double drive Mach-
The optical signal of Dare modulator output enters bragg grating by optical circulator, due to the transmission of bragg grating
And reflex, light carrier and useless optics sideband are filtered out, and are reflected back the single order sideband of signal, are finally visited by photoelectricity
It surveys device and obtains intermediate-freuqncy signal.
2. method that is according to claim 1 while realizing microwave photon down conversion and phase shift, it is characterised in that:
The optical signal exported from double drive Mach-Zehnder modulators are as follows:
P0The power of tunable laser is represented, w0 represents the frequency of light carrier,For double drive Mach-Zehnder
The upper arm modulation depth of modulator,For the lower arm modulation depth of double drive Mach-Zehnder modulators, VRFWith
VLORepresent the amplitude of radiofrequency signal and local oscillation signal, VπIt is the half-wave voltage of double drive Mach-Zehnder modulators；ωRFWith
ωLOFor the frequency of radiofrequency signal and local oscillation signal, θ is the phase difference of upper lower arm.
3. method that is according to claim 1 while realizing microwave photon down conversion and phase shift, it is characterised in that:
Bragg grating reflection single order RF and LO sideband, reaches the function of filtering.
4. method that is according to claim 1 while realizing microwave photon down conversion and phase shift, it is characterised in that:
The phase that photodetector exports intermediate-freuqncy signal indicates:
VDCIt is the DC offset voltage of double drive Mach-Zehnder modulators, w0Represent the frequency of light carrier, VπIt is double drive horse
The half-wave voltage of conspicuous-Zeng Deer modulator, c are the light velocity, and L indicates the wavelength of tunable laser；
It can be by adjusting the DC offset voltage of double drive Mach-Zehnder modulators and the wavelength of tunable laser come real
The function of existing phase shift.
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| CN107846254B (en) * | 2017-10-12 | 2020-04-17 | 北京工业大学 | Photonic method and system for realizing microwave down-conversion and phase shift by utilizing integrated device |
| CN108365896B (en) * | 2018-01-25 | 2019-10-11 | 西安电子科技大学 | Microwave photonic down-conversion method based on dual-driver PDM-MZM |
| CN109039463B (en) * | 2018-08-15 | 2019-10-11 | 南京航空航天大学 | Microwave photonic broadband phase shifting method and microwave photonic broadband phase shifting chip |
| CN109088673B (en) * | 2018-09-05 | 2020-07-03 | 北京邮电大学 | Broadband signal microwave photon phase shifting method and system based on double carriers |
| CN109067469A (en) * | 2018-09-27 | 2018-12-21 | 安徽工程大学 | A kind of laser frequency shifter and frequency shift method based on multifrequency phase modulation |
| CN111596278A (en) * | 2019-12-24 | 2020-08-28 | 北京理工大学 | Multi-band coherent swept-frequency radar system based on dual-drive Mach-Zehnder modulators |
| CN111600658B (en) * | 2020-05-15 | 2023-05-16 | 中国电子科技集团公司第四十四研究所 | Low-noise microwave photonic frequency conversion architecture based on single-stage dual-driver modulator |
| CN115314114B (en) * | 2022-07-29 | 2024-02-23 | 中国科学技术大学 | Single-frequency signal generation method, system and application |
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| CN103326789B (en) * | 2013-05-03 | 2016-01-06 | 华中科技大学 | A kind of microwave Phase Shifting System of frequency-tunable and method |
| CN103684613A (en) * | 2013-11-20 | 2014-03-26 | 南京航空航天大学 | Photonic microwave frequency mixing method and device |
| CN103888191A (en) * | 2014-03-19 | 2014-06-25 | 北京邮电大学 | Microwave photon down-conversion method based on bi-directional utilization of phase modulator |
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