CN107919914A - Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift - Google Patents
Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift Download PDFInfo
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- CN107919914A CN107919914A CN201711470967.6A CN201711470967A CN107919914A CN 107919914 A CN107919914 A CN 107919914A CN 201711470967 A CN201711470967 A CN 201711470967A CN 107919914 A CN107919914 A CN 107919914A
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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
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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
- H04B10/501—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
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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
Quadruple signal is generated based on double-parallel modulator and realize the device and method of microwave photon phase shift the invention discloses a kind of, which is related to microwave and technical field of photo communication, is mainly used in microwave photon signal processing.Described device as shown in drawings, including tunable laser source (TLS), double-parallel modulator (DPMZM), erbium-doped fiber amplifier (EDFA), optical circulator (OC), bragg grating (FBG), faraday rotation mirror (FRM), Polarization Controller (PC), the polarizer (Pol), photodetector (PD).This method obtains the positive and negative second order sideband optical signal of cross-polarization multiplexing using DPMZM, FBG and FRM, the phase difference between positive and negative second order sideband is adjusted with reference to PC and Pol, dephased quadruple microwave signal is obtained by PD beat frequencies, it can be achieved that the 360 degree of Continuous phase shiftings and holding amplitude of microwave signal are basically unchanged afterwards.In addition, this programme also has, tuning range is wide, simple in structure, strong operability, the advantages that application available for multichannel.
Description
Technical field
The present invention relates to double parallel is based in technical field of photo communication and microwave technical field, more particularly to optical communication technique
Modulator generates quadruple signal and realizes microwave photon phase shift.
Background technology
Microwave photonics are a special kind of skill that recent decades microwave is merged with photonic propulsion, it using Photonics Technology generation,
Transmission and processing microwave signal, it is intended to traditional microwave technology is overcome in the electronic bottleneck of processing speed and transmission bandwidth etc.,
Microwave system working performance is increased substantially, or realizes the function that traditional microwave technology can not be realized.Microwave phase shift is as microwave
A key technology in photonic propulsion, plays the role of important in fields such as phased-array radar, satellite communication, electronic countermeasures.Compare
In traditional electric phase shift technology, microwave phase shift has an obvious advantage, this design have bandwidth it is wider, can continuously phase modulation, tune
Phase scope is big, electromagnetism interference is strong, the low advantage of loss, it is often more important that, micro-wave light quantum phase shifter can be accomplished integrated, reach
Volume and lighter weight to smaller.
Classified according to operation principle, mainly there are three kinds of micro-wave light quantum phase shifters at present：(1) microwave based on vector sum technology
Quantum phase shifter, i.e., carry out vector superposed, the signal as output signal, and exporting after superposition by input signal with additional signal
The phase of signal can produce change relative to the phase of input signal, its knots modification and the amplitude of superposed signal and initial phase
Position is related.Micro-wave light quantum phase shifter based on heterodyne mixing technique, that is, produce the light wave of two-way frequency and phase stabilization, by one
Two-way light wave is separated after fixed processing, to wherein the phase of light wave is controlled all the way, is afterwards again synthesized two-way light wave, most
Afterwards in photodetector beat frequency generation phase-adjustable radiofrequency signal.(2) the microwave photon phase shift based on light true-time delay
Device, i.e., make microwave signal of the loading on optical signal pass through different light paths by varying delay line length, realizes and microwave is believed
Number phase shift.(3) micro-wave light quantum phase shifter based on heterodyne mixing technique, that is, produce the light wave of two-way frequency and phase stabilization,
Two-way light wave is separated after certain processing, to wherein the phase of light wave is controlled all the way, afterwards again by two-way light wave
Synthesis, finally in photodetector beat frequency generation phase-adjustable radiofrequency signal.
Microwave signal can directly be converted optical signals into based on heterodyne mixing technique, so the microwave using this technology
Photosystem is not required interminable optical delay line, and has one using the phase shifter of this fabrication techniques the biggest advantage is to tie
Structure relative compact, is easier to realize integrated.In addition, the amplitude of accommodation is not required during phase modulation using this technology, it
The scope of output signal fluctuation is also smaller.To the structural requirement phase of device when this technology major defect is to realize sideband modulation
To complexity, or need to carry out microwave signal in advance the external treatment of complexity.
The content of the invention
In order to solve the technical problem in the presence of background technology, the present invention proposes a kind of based on double-parallel modulator life
Quadruple and frequency signal and realize the device and method of microwave photon phase shift.
Scheme is used by the present invention solves its technical problem：Described device includes tunable laser source (TLS), double parallel
Modulator (DPMZM), erbium-doped fiber amplifier (EDFA), optical circulator (OC), bragg grating (FBG), faraday's rotation
Tilting mirror (FRM), Polarization Controller (PC), the polarizer (Pol), photodetector (PD)；The output terminal of TLS is connected with DPMZM,
The output terminal of DPMZM is connected with the input terminal of EDFA, and the output terminal of EDFA is connected with the input terminal of OC, and mono- output terminals of OC pass through
FBG is connected with FRM, and the output of another output terminals of OC is divided into N roads by beam splitter, every to be connected all the way through PC with the input terminal of Pol,
The output terminal of Pol is connected with the input terminal of PD.
Above-mentioned DPMZM is integrated in a MAIN MUX by the upper and lower sub- modulator parallel connections of two parallel MZMa, MZMb
(MZMc) formed on, there is rf input port and Dc bias control mouth on sub- modulator respectively, there is identical structure and performance.
MAIN MUX possesses a direct current bias voltage control mouth.
The present invention comprises the following steps at work：
1) light carrier that TLS is sent enter DPMZM in, light carrier is divided into two parts in DPMZM, respectively enter MZMa and
In MZMb；
2) radio frequency signals drive MZMa, setting the size of bias voltage makes MZMa be biased in maximum transmitted point, carries out suppression odd times
The double sideband modulation of harmonic wave.MZMb is arranged on maximum point without radio frequency signals drive and bias voltage, and optical signal directly exports, not by
Modulation.MZMc is biased in smallest point, the second order sideband signals for the carrier wave that can be inhibited in the output terminal of DPMZM；
3) after the loss that the signal of the output of DPMZM amplifies supplement energy through EDFA, suppressed carrier second order sideband signals pass through light
Circulator enters FBG, by adjusting the wavelength of TLS, positive second order sideband is fallen into the center of FBG trap wave points, is reflected back toward OC；It is negative
Second order sideband is eventually passed through and is reflected back OC by FRM after FBG, its polarization direction is rotated by 90 degree by FBG；
4) positive and negative second order sideband reconsolidates in OC, has obtained the suppressed carrier second order sideband signals of cross-polarization multiplexing；
5) orthogonal polarization signals after merging are divided into N roads by beam splitter, identical per principle all the way.By adjusting PC, make orthogonal
Polarization signal is merged into the linearly polarized light in a direction after Pol.
6) signal of polarizer output can obtain quadruple microwave signal by photodetector beat frequency, then by adjusting Pol
PC before, makes the phase shift of quadruple microwave signal arbitrarily be adjusted in the range of 360 °；
7) RF source frequencies, repeat step 2,3,4,5,6 are changed.
The present invention, which proposes, a kind of to be generated quadruple signal based on double-parallel modulator and realizes microwave photon phase shift
Method, this method produces the suppressed carrier second order sideband signals of cross-polarization using DPMZM, FBG, FRM etc., by adjusting PC
Phase difference between positive and negative second order sidebands of the Pol to exporting signal is controlled, so as to obtain different phases after photodetection
The quadruple microwave signal of shifting.
The present invention can produce quadruple microwave signal, by adjusting per the PC before Pol on the way, quadruple microwave signal
Phase shift independent can arbitrarily be adjusted in 360 degree and amplitude hardly changes.Therefore this programme tuning range it is wide,
It is simple in structure, there is very strong operability, and can be used for multichannel application.
The present invention directly carries out phase shift in area of light, achievees the purpose that microwave signal phase shift by the processing to optical signal, gram
The inferior positions such as traditional microwave phase shift band bandwidth is small, interference free performance is poor, phase shift range is small, response speed is slow have been taken, system
Performance is greatly improved.
Brief description of the drawings
Fig. 1 is that the present invention is grown directly from seeds based on DPMZM and quadruples frequency signal and realize the schematic diagram of microwave photon phase shift；
Fig. 2 is the transmission spectrum and reflectance spectrum of FBG；
Fig. 3 is the spectrogram in the specific location survey of scheme：
(a) when radiofrequency signal is 3GHz, the reflectance spectrum of FBG, the suppressed carrier second order sideband before filtering and filtered positive two
Rank sideband；
(b) when radiofrequency signal is 3GHz, the transmission spectrum of FBG, the suppressed carrier second order sideband before filtering and filtered minus two
Rank sideband；
(c) when radiofrequency signal is 4GHz, the reflectance spectrum of FBG, the suppressed carrier second order sideband before filtering and filtered positive two
Rank sideband；
(d) when radiofrequency signal is 4GHz, the transmission spectrum of FBG, the suppressed carrier second order sideband before filtering and filtered minus two
Rank sideband；
Fig. 4 is the electric spectrogram of generation：
(a) when radiofrequency signal is 3GHz, the electric spectrogram of the 12GH signals of generation；
(b) when radiofrequency signal is 4GHz, the electric spectrogram of the 16GHz signals of generation；
Fig. 5 is the time domain waveform of the quadruple signal of generation：
(a) trigger signal produced for signal generator, has identical frequency and amplitude with the quadruple signal that PD is obtained；
(b)~(i) be respectively when quadruple signal phase shift for 0 degree, 45 degree, 90 degree, 135 degree, 180 degree, 225 degree, 270 degree and
Corresponding waveform at 315 degree.
Embodiment
Elaborate below in conjunction with the accompanying drawings to the embodiment of the present invention：The present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
The embodiment stated：
As shown in Figure 1, the present embodiment includes TLS, DPMZM, FBG, EDFA, OC, FRM, PC, Pol and PD.TLS and DPMZM
Input terminal be connected, the upper sub- modulator MZMa of radio frequency signals drive DPMZM, its bias voltage is arranged on maximum point, lower sub- tune
Device MZMb rf inputs mouth processed is unloaded, and is biased in maximum point, and MAIN MUX MZMc is biased in smallest point；The output of DPMZM
End is connected with the input terminal of EDFA, and the output terminal of EDFA is connected with the input terminal of OC, and mono- output terminals of OC pass through FBG and FRM phases
Even, the output of another output terminal is divided into N roads, per being connected all the way through PC with the input terminal of Pol, the output terminal of Pol and PD's
Input terminal is connected.Observe the phase shift of the electric signal and signal of generation respectively using electric frequency spectrograph and oscillograph.
In this example, the specific implementation step of method is：
Step 1：Tunable laser source produces the continuous light carrier input that operation wavelength is 1550.027nm, luminous power is 10dBm
To DPMZM, E is denoted asin(t)；
Step 2：It is 3GHz that radio-frequency signal source, which produces frequency, and power is the radiofrequency signal of 10dBm, and angular frequency is denoted as ωR, amplitude
It is denoted as VR, radiofrequency signal is expressed as VR sin(ωRt).Radiofrequency signal is input to the prevention at radio-frequency port of MZMa, MZMa is biased in most
Big transfer point, suppress the double sideband modulation of odd harmonic.MZMb is biased in maximum point, and prevention at radio-frequency port is unloaded, and optical signal is not
Modulated, directly exported.MAIN MUX MZMc is biased in smallest point.When modulation index is smaller, the output of DPMZM is only comprising positive and negative
Second order optical sideband, can be expressed as following formula：
Wherein Ex(t) and Ey(t) be respectively MZMa and MZMb in DPMZM output.Wherein m=π VR/VπFor the modulation of DPMZM
Index, VπFor the half-wave voltage of DPMZM.Jn() is first kind n rank Bessel functions；
Step 3：Obtained suppressed carrier second order sideband signals by optical circulator enter FBG after being amplified by EDFA, and FBG's is saturating
Spectrum is penetrated with reflectance spectrum as shown in Fig. 2, adjusting the wavelength of TLS, positive second order sideband is fallen into the center of FBG trap wave points, is reflected back toward
OC, bears second order sideband by FBG, but is finally reflected back OC by FRM, its polarization direction is rotated by 90 degree；Before and after filtering
Optical signal is separately input in spectrometer, shown in obtained result such as Fig. 3 (a), 3 (b)：When radiofrequency signal is 3GHz, minus two
Rank sideband is 30dB by the filtered ratios that suppress of FBG, and positive second order sideband is 43Db by the filtered ratios that suppress of FBG.Positive two
The suppression of rank sideband is that positive second order sideband inhibits two by FBG because having used FRM than the suppression ratio far above negative second order sideband
It is secondary.
Step 4：Positive and negative second order sideband is reconsolidated by OC, has obtained the suppressed carrier second order sideband of cross-polarization multiplexing, as follows
Shown in formula：
Step 5：The orthogonal polarization signals obtained in step 4 are divided into N roads by beam splitter, every all the way by adjusting PC,
Orthogonal polarization signals is merged into the linearly polarized light in a direction through Pol, then by adjusting the PC before Pol, can arbitrarily adjust
Phase difference between whole positive and negative second order sideband；
Step 6：Dephased quadruple microwave signal is obtained by PD beat frequencies from the optical signal of polarizer output, can be represented
For：
As shown in Fig. 4 (a), when radiofrequency signal is 3GHz, the signal of 12GHz is generated, meets expection；
Step 7：Radio frequency signal frequency is changed to 4GHz, repeats above-mentioned two, three, four, five, six, can obtain Fig. 3 (c) (d) when penetrating
When frequency signal is 4GHz, it is 31.6dB to bear second order sideband by the filtered ratios that suppress of FBG, and positive second order sideband is filtered by FBG
Suppression afterwards is compared for 36.6dB.Fig. 4 (b), when radiofrequency signal is 4GHz, the 16GHz signals of generation, demonstrate the width of this programme
Tunable range.
Step 7：The 12GHz trigger signals of radio-frequency signal generator generation is same with passing through the 12GHz quadruple signals that PD is obtained
When be input in oscillograph (trigger signal is with the signal that PD is obtained with the same phase of width), by adjusting PC, can obtain and trigger signal
Waveform with random phase difference, while amplitude is almost unchanged, experimental result is as shown in Figure 5.Due to being subject to the bandwidth of oscillograph
Limit (20GHz), the maximum available quadruple signal of this programme is 20GHz, and the radiofrequency signal that maximum can load is 5GHz.By
The limitation of oscilloscope sampling rate, the time domain waveform of generation quadruple signal phase shift is unstable, and amplitude is slightly changed, and is adopted using higher
The oscillograph of sample rate will obtain more stable waveform.
To sum up, the present invention is generated using devices such as DPMZM, FRM, FBG, PC, Pol while microwave photon phase shift is realized
Quadruple signal.This programme tuning range is wide, it is simple in structure, there is very strong operability, and should available for multichannel
With.
In short, embodiments described above is only the embodiment of the present invention, not it is only used for limiting the guarantor of the present invention
Protect scope, it is noted that for those skilled in the art, can be with present disclosure
Some equivalent variations and replacement are made, such as the operating frequency range of micro-wave light quantum phase shifter is not limited to 5GHz, if using more
The oscillograph of big bandwidth, the system can carry out phase shift to the microwave signal of bigger frequency.These equivalent variations and replace and
The adjustment of frequency range also should be regarded as the scope of protection of the invention.
Claims (5)
1. quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift, including it is adjustable
Lasing light emitter (TLS), double-parallel modulator (DPMZM), erbium-doped fiber amplifier (EDFA), optical circulator (OC), bragg fiber
Grating (FBG), faraday rotation mirror (FRM), Polarization Controller (PC), the polarizer (Pol), photodetector (PD), its feature
It is, the output terminal of TLS is connected with DPMZM, and the output terminal of DPMZM is connected with the input terminal of EDFA, the output terminal and OC of EDFA
Input terminal be connected, mono- output terminals of OC are connected by FBG with FRM, and the output of another output terminals of OC is divided after beam splitter
For N roads, per being connected all the way through PC with the input terminal of Pol, the output terminal of Pol is connected with the input terminal of PD.
The DPMZM is integrated in a MAIN MUX (MZMc) by the upper and lower sub- modulator parallel connections of two parallel MZMa, MZMb
Upper composition, with radio frequency signals drive MZMa, and is biased in maximum point, suppress the double sideband modulation of odd harmonic, output is only
Optical signal containing carrier wave and positive and negative second order sideband, MZMb are biased in maximum point, and rf inputs mouth is unloaded, and direct output light carries
Ripple, MZMc are biased in smallest point, make up and down that two ways of optical signals is there are 180 degree phase difference, by optical carrier suppression, finally in DPMZM
Output terminal can be inhibited the positive and negative second order sideband signals of carrier wave.
The FBG is used for the negative second order sideband of positive the second order sideband and transmission signal of reflected signal.
The FRM is used to reflect the negative second order sideband by FBG transmissions, and introduces 90 degree of polarization angle.
The PC and Pol are used for realization is converted into linearly polarized light signal by the cross-polarization multiplexing optical signal of OC outputs, passes through tune
Whole PC, can arbitrarily adjust the phase difference between positive and negative second order sideband, and the linearly polarized light signal of polarizer output enters PD beat frequencies
After can obtain dephased quadruple microwave signal.
2. according to claim 1 generate quadruple signal based on double-parallel modulator and realize microwave photon phase shift
Device and method, it is characterised in that DPMZM combinations FBG, FRM can obtain the positive and negative second order sideband light letter of cross-polarization multiplexing
Number.
3. according to claim 1 generate quadruple signal based on double-parallel modulator and realize microwave photon phase shift
Device and method, it is characterised in that quadruple microwave signal can be obtained after PD beat frequencies.
4. according to claim 1 generate quadruple signal based on double-parallel modulator and realize microwave photon phase shift
Device and method, it is characterised in that the N roads optical signal being divided into via beam splitter per all the way can by adjusting PC,
On the premise of the amplitude of guarantee is basically unchanged, 360 degree of Continuous phase shiftings of microwave signal are realized.
5. according to claim 1 generate quadruple signal based on double-parallel modulator and realize microwave photon phase shift
Device and method, it is characterised in that the N roads optical signal being divided into via beam splitter is separate, can respective independent phase modulation.
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| CN108809427A (en) * | 2018-04-18 | 2018-11-13 | 俞俊生 | Based on the adjustable Terahertz wireless communication system of the phased wave beam of optics and communication means |
| CN109039464A (en) * | 2018-08-30 | 2018-12-18 | 吉林大学 | A kind of microwave photon millimeter wave ultra-wideband signal generating method and device based on up-conversion |
| CN109039463A (en) * | 2018-08-15 | 2018-12-18 | 南京航空航天大学 | Microwave photon broadband phase-moving method and microwave photon broadband phase shift chip |
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
| CN109617614A (en) * | 2018-12-24 | 2019-04-12 | 北京工业大学 | A kind of microwave photon linearisation transmission method and system |
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| CN112558053A (en) * | 2020-10-28 | 2021-03-26 | 电子科技大学 | Optical beam forming network device and method based on microwave photon true time delay |
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| CN108809427A (en) * | 2018-04-18 | 2018-11-13 | 俞俊生 | Based on the adjustable Terahertz wireless communication system of the phased wave beam of optics and communication means |
| CN109039463B (en) * | 2018-08-15 | 2019-10-11 | 南京航空航天大学 | Microwave photon broadband phase-moving method and microwave photon broadband phase shift chip |
| CN109039463A (en) * | 2018-08-15 | 2018-12-18 | 南京航空航天大学 | Microwave photon broadband phase-moving method and microwave photon broadband phase shift chip |
| CN109039464A (en) * | 2018-08-30 | 2018-12-18 | 吉林大学 | A kind of microwave photon millimeter wave ultra-wideband signal generating method and device based on up-conversion |
| CN109039464B (en) * | 2018-08-30 | 2021-07-13 | 吉林大学 | Microwave photon millimeter wave ultra-wideband signal generation method and device based on up-conversion |
| CN109581301A (en) * | 2018-12-03 | 2019-04-05 | 杭州电子科技大学 | Double chirp frequency doubling signal generating devices and its method based on double-parallel modulator |
| CN109617614B (en) * | 2018-12-24 | 2020-07-03 | 北京工业大学 | Microwave photon linear transmission method and system |
| CN109617614A (en) * | 2018-12-24 | 2019-04-12 | 北京工业大学 | A kind of microwave photon linearisation transmission method and system |
| CN109639364A (en) * | 2019-01-30 | 2019-04-16 | 广东工业大学 | A kind of multichannel arbitrary carry system phase-coded signal optics generation device and production method |
| CN109639364B (en) * | 2019-01-30 | 2021-07-06 | 广东工业大学 | Optical generating device and method for multi-channel arbitrary system phase coding signals |
| CN111193548A (en) * | 2019-11-14 | 2020-05-22 | 苏州枫桥光电科技有限公司 | Microwave photon waveform generation device and method based on cyclic frequency shift |
| CN111193548B (en) * | 2019-11-14 | 2021-01-08 | 苏州枫桥光电科技有限公司 | Microwave photon waveform generation device and method based on cyclic frequency shift |
| CN112558053A (en) * | 2020-10-28 | 2021-03-26 | 电子科技大学 | Optical beam forming network device and method based on microwave photon true time delay |
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Application publication date: 20180417 |