CN102710335A - Device and method for generating microwave/millimeter wave photon frequency quadrupling - Google Patents
Device and method for generating microwave/millimeter wave photon frequency quadrupling Download PDFInfo
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- CN102710335A CN102710335A CN201210143744XA CN201210143744A CN102710335A CN 102710335 A CN102710335 A CN 102710335A CN 201210143744X A CN201210143744X A CN 201210143744XA CN 201210143744 A CN201210143744 A CN 201210143744A CN 102710335 A CN102710335 A CN 102710335A
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Abstract
The invention discloses a device and a method for generating microwave/millimeter wave photon frequency quadrupling. A light source, a double-parallel Mach-Zehnder demodulator, a light amplifier and a photoelectric detector are sequentially connected through an optical fiber, wherein the double-parallel Mach-Zehnder demodulator comprises a first Mach-Zehnder demodulator, a second Mach-Zehnder demodulator and a phase demodulator; one end of the first Mach-Zehnder demodulator is connected with one end of the second Mach-Zehnder demodulator; the other end of the second Mach-Zehnder demodulator is connected with one end of the phase demodulator; the other end of the phase demodulator is connected with the other end of the first Mach-Zehnder demodulator; and the first radio frequency demodulating interface of the first Mach-Zehnder demodulator is connected with a microwave/millimeter wave signal source through a microwave coaxial line. According to the invention, the microwave/millimeter wave photon frequency quadrupling is generated, the frequency band requirements of a microwave/millimeter wave source are reduced and a filter is not introduced, so that the device and the method are more suitable for application of dense wavelength division decomplexing.
Description
Technical field
The present invention relates to optical communication field, relate in particular to a kind of devices and methods therefor that produces microwave/millimeter wave photon 4 frequencys multiplication.
Background technology
Millimetre-wave attenuator is research focus in the ROF system in the last few years based on the millimetre-wave attenuator of 40G/60G particularly, millimetre-wave attenuator decimillimeter wave wave guide communication two classes greatly of communicate by letter with millimeter wqve radio.The advantage of millimetre-wave attenuator is: 1, available band is extremely wide.The millimere-wave band frequency bandwidth is 270 gigahertz (GHZ)s (GHz), is 10,000 times of whole short-wave band; 2, high directivity, good confidentiality; 3, disturb the influence of very little, almost static-free, cosmic interference and industrial interference, thereby communication is stable.
It is present millimeter-wave communication system that optical means produces the frequency-doubling millimeter wave signal, and particularly vital research direction in the 40G/60G millimeter-wave communication system has proposed a large amount of reference schemes now in order to produce the millimeter-wave signal of 40G/60G.The method of wherein utilizing Mach-Zehnder intensity modulator (MZM) to produce the millimeter wave frequency multiplication attracts most attention, because it is having high spectrum stability, advantages such as signal high-purity are having huge application potential aspect this technical field.
The research direction main based on the external modulation technology combines following two aspects mostly: modulation signal format mainly is divided into double-sideband signal (DSB), these three kinds of single sideband singal (SSB) and suppressed carrier signals (OSC); The operating bias point mainly contains linear point (QB), the research of luminous power maximum point (MATB) and three bias points of luminous power smallest point (MITB).2 frequencys multiplication that propose based on these aspects considerations and the microwave/millimeter wave signal of 4 frequencys multiplication produce scheme all has separately advantage and defective.For instance; The technology that produces the 40G/60G millimeter-wave signal based on luminous power smallest point (MITB) is based on 2 frequency-doubled signals generation millimeter wave; This kind method produces the efficient of signal than higher; Need not in system, to introduce optical filter filtering carrier wave, but require the more radiofrequency signal of high frequency band, so the cost of system can increase; And can realize 4 frequencys multiplication of signal based on the method that luminous power maximum point (MATB) produces the 40G/60G millimeter-wave signal; Requirement to radiofrequency signal reduces greatly; But but must in system, introduce like optical filter, the filtering light carrier could be realized 4 frequencys multiplication; Therefore the complexity of system can strengthen, and also is unfavorable in dense wave division multipurpose (DWDM) system, using.
On the other hand; The design of two parallel Mach-Zehnder modulators (DPMZM) and generation make the generation of 40G/60G millimeter wave and transmission provide convenient greatly; Its application is very extensive; Produce this part at millimeter-wave signal, make whole millimeter-wave signal generation systems structure simple more and tight, cost also reduces greatly.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of devices and methods therefor that produces microwave/millimeter wave photon 4 frequencys multiplication is provided.
The device that produces microwave/millimeter wave photon 4 frequencys multiplication comprises two parallel Mach-Zehnder modulators, light source, microwave/millimeter wave signal source, image intensifer, photodetector; Light source, two parallel Mach-Zehnder modulators, image intensifer, photodetector link to each other through optical fiber in order; Two parallel Mach-Zehnder modulators comprise first Mach-Zehnder modulators; Second Mach-Zehnder modulators and phase-modulator; One end of first Mach-Zehnder modulators links to each other with an end of second Mach-Zehnder modulators; The other end of second Mach-Zehnder modulators links to each other with an end of phase-modulator; The other end of phase-modulator links to each other with the other end of first Mach-Zehnder modulators, and first Mach-Zehnder modulators is provided with the first rf modulations mouth, the first voltage bias mouth, and second Mach-Zehnder modulators is provided with the second rf modulations mouth, the second voltage bias mouth; Phase-modulator is provided with the phase modulated mouth, and the first rf modulations mouth of first Mach-Zehnder modulators is connected with the microwave/millimeter wave signal source through the microwave coaxial line.
Produce the method for microwave/millimeter wave photon 4 frequencys multiplication: the light that light source sends is through two parallel Mach-Zehnder modulators; Regulate the microwave/millimeter wave signal source and produce radiofrequency signal; Regulate the first voltage bias mouth, make first Mach-Zehnder modulators be operated in the luminous power maximum point; Make the second rf modulations mouth ground connection, let light carrier pass through, but without ovennodulation; Regulate said phase voltage biasing mouth; Make it be operated in V π, make and introduced the phase shift of π radian, regulate the described second voltage bias mouth through the spectrum of said second rf modulations mouth modulation output; Make the Output optical power of said two parallel Mach-Zehnder modulators reach minimum value; Thereby make that the light carrier of two-way is just in time offset up and down, final, the output of said two parallel Mach-Zehnder modulators is the even-order sideband of suppressed carrier; Behind said image intensifer and said photodetector, take 4 pure frequency multiplication microwave/millimeter wave signals.
The present invention has used a two parallel Mach-Zehnder modulators, has reduced the cost of whole system; Avoided the use of the introducing of the optical filter in the conventional method, made the complexity of system reduce greatly, be convenient to be applied in the system of dense wave division multipurpose DWDM; Can dynamically control 4 frequencys multiplication that beat frequency produces and the signal of 2 frequencys multiplication through regulating two parallel Mach-Zehnder modulators phase place mouth bias voltages, making, be convenient to realize that multi-band signal produces and system for transmitting, be convenient to realize the optical link systems of many services; Through regulating the frequency values of radiofrequency signal, realize the generation of the microwave/millimeter wave signal of any 4 frequencys multiplication, especially at current 40G, crucial application is arranged in the millimetre-wave attenuator of 60G even higher frequency.
Description of drawings
Fig. 1 is for producing the apparatus structure sketch map of microwave/millimeter wave photon 4 frequencys multiplication;
Fig. 2 is microwave signal f
RFSpectrogram during=3.5GHz;
Fig. 3 is microwave signal f
RFSpectrogram during=10GHz;
Among the figure: two parallel Mach-Zehnder modulators 1, light source 2, microwave/millimeter wave signal generating source 3, image intensifer 4, photodetector 5, the first rf modulations mouth 101, the second rf modulations mouth 201, first bias voltage modulation mouthful 102, second bias voltage modulation mouthfuls 202 and a phase bias voltage modulated mouth 301.
Embodiment
As shown in Figure 1, comprise two parallel Mach-Zehnder modulators 1, light source 2, microwave/millimeter wave signal source 3, image intensifer 4, photodetector 5; Light source 2, two parallel Mach-Zehnder modulators 1, image intensifer 4, photodetector 5 link to each other through optical fiber in order; Two parallel Mach-Zehnder modulators 1 comprise first Mach-Zehnder modulators 6; Second Mach-Zehnder modulators 7 and phase-modulator 8; One end of first Mach-Zehnder modulators 6 links to each other with an end of second Mach-Zehnder modulators 7; The other end of second Mach-Zehnder modulators 7 links to each other with an end of phase-modulator 8; The other end of phase-modulator 8 links to each other with the other end of first Mach-Zehnder modulators 6, and first Mach-Zehnder modulators 6 is provided with the first rf modulations mouth 601, the first voltage bias mouth, 602, the second Mach-Zehnder modulators 7 and is provided with the second rf modulations mouth 701, the second voltage bias mouth 702; The first rf modulations mouth 601 that phase-modulator 8 is provided with phase modulated mouth 801, the first Mach-Zehnder modulators 6 is connected with microwave/millimeter wave signal source 3 through the microwave coaxial line.
Produce the method for microwave/millimeter wave photon 4 frequencys multiplication: the light that light source 2 sends is through two parallel Mach-Zehnder modulators 1; Regulate microwave/millimeter wave signal source 3 and produce radiofrequency signal; Regulate the first voltage bias mouth 602, make first Mach-Zehnder modulators 6 be operated in the luminous power maximum point; Make the second rf modulations mouth, 701 ground connection, let light carrier pass through, but without ovennodulation; Regulate said phase voltage biasing mouth 801; Make it be operated in V π, make and introduced the phase shift of π radian, regulate the described second voltage bias mouth 702 through the spectrum of the said second rf modulations mouth 701 modulation outputs; Make the Output optical power of said two parallel Mach-Zehnder modulators 1 reach minimum value; Thereby make that the light carrier of two-way is just in time offset up and down, final, the output of said two parallel Mach-Zehnder modulators 1 is the even-order sideband of suppressed carrier; Behind said image intensifer 4 and said photodetector 5, take 4 pure frequency multiplication microwave/millimeter wave signals.
The operation principle of apparatus of the present invention is following:
A kind of method that produces microwave/millimeter wave photon 4 frequencys multiplication is following:
Single wavelength laser Laser2 is output as through single Mach-Zehnder modulators:
E
out(t)=E
0cos(Φ/2)*cos(ω
0t) （1）
Wherein, E
0And ω
0Be respectively input electric field strength and light carrier angular frequency, Φ is the phase difference of two arms of Mach-Zehnder modulators.
Φ=φ
DC+πV
mcos(ω
RFt)/V
π （2）
Wherein, φ
DCFor the fixed phase drift that two arms of single Mach-Zehnder modulators are introduced poor, V
πBe the half-wave voltage of Mach-Zehnder modulators, ω
RFRadio frequency angular frequency for input.
Can know by said principle; Let the microwave/millimeter wave signal be modulated on the said first rf modulations mouth 101; Regulate first bias voltage 102, make it be operated in the luminous power maximum point, make the second rf modulations mouth, 201 ground connection of said two parallel Mach-Zehnder modulators 1; Light carrier passes through, but without ovennodulation; Then the output end signal of two parallel Mach-Zehnder modulators 1 is:
E
out(t)=1/2*E
0?cos(ω
0t)*{cos[m?cos(ω
RFt)]+cos(V
bias)} (3）
ω wherein
RFBe the radio frequency angular frequency of modulation, ω
RF=2 π * f
RF, m is the index of modulation, m=(pi/2) (V
m/ V
π), V
BiasBe phase place mouth bias voltage.J
iBe Bessel function of the first kind i rank item.It is launched with Bezier, and (3) can be expressed as:
Regulate the phase voltage biasing mouth 301 of said two parallel Mach-Zehnder modulators 1, make it be operated in V
π, make and introduced the phase shift of π radian through the spectrum of the said second rf modulations mouth 201 modulation outputs.Regulate the second voltage bias mouth 202 of said two parallel Mach-Zehnder modulators 1, make J
0(m)=-cos (V
Bias), the Output optical power of at this moment said two parallel Mach-Zehnder modulators 1 reaches minimum value.Ignore high-order term (n>1), (5) formula can be expressed as:
E
out(t)=E
0cos(ω
0t)*{-J
2(m)cos(2ω
RFt)+J
4(m)cos(4ω
RFt)} (5）
E
out(t)=-1/2*E
0
*{J
2(m)[cos(w
0t+2w
RFt)+cos(w
0t-2w
RFt)]
-J
4(m)[cos(w
0t+4w
RFt)+cos(w
0t-4w
RFt)} （6）
The light signal of output is amplified through image intensifer 4, get into photodetector 5 afterwards and survey.
High-speed photodetector 5 among the present invention is envelope responses, and responsive bandwidth is greater than 4 ω
RF, the photoelectric current of photodetector 5 outputs can be expressed as:
i(t)=R|E(t)|
2 （7）
Wherein R is the responsiveness of photodetector, is generally 0.6A/W.
So 4 frequency-doubled signals that produce can be expressed as:
P
4th∝R
2*E
0 4*J
2(m)
4 （8）
2 frequency-doubled signals that produce do
P
2nd∝4R
2*E
0 4*J
2(m)
2*J
4(m)
2 （9）
Wherein, the ratio of 4 frequencys multiplication and 2 frequency-doubled signals is:
η=P
4th/P
2nd=J
2(m)
2/4J
4(m)
2
（10）
Can find thus, for the representative value of general m, 0 < m≤2, the signal magnitude that produces 2 frequencys multiplication is compared and can be ignored with the signal magnitude that produces 4 frequencys multiplication.
Fig. 2 is f for microwave signal
RFThe microwave signal spectrogram of 4 frequencys multiplication that obtain during=3.5GHz, Fig. 3 is f for microwave signal
RFThe millimeter-wave signal spectrogram of 4 frequencys multiplication that obtain during=10GHz.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (2)
1. a device that produces microwave/millimeter wave photon 4 frequencys multiplication is characterized in that comprising two parallel Mach-Zehnder modulators (1), light source (2), microwave/millimeter wave signal source (3), image intensifer (4), photodetector (5); Light source (2), two parallel Mach-Zehnder modulators (1), image intensifer (4), photodetector (5) link to each other through optical fiber in order; Two parallel Mach-Zehnder modulators (1) comprise first Mach-Zehnder modulators (6); Second Mach-Zehnder modulators (7) and phase-modulator (8); One end of first Mach-Zehnder modulators (6) links to each other with an end of second Mach-Zehnder modulators (7); The other end of second Mach-Zehnder modulators (7) links to each other with an end of phase-modulator (8); The other end of phase-modulator (8) links to each other with the other end of first Mach-Zehnder modulators (6); First Mach-Zehnder modulators (6) is provided with the first rf modulations mouth (601), the first voltage bias mouth (602); Second Mach-Zehnder modulators (7) is provided with the second rf modulations mouth (701), the second voltage bias mouth (702), and phase-modulator (8) is provided with phase modulated mouth (801), and the first rf modulations mouth (601) of first Mach-Zehnder modulators (6) is connected with microwave/millimeter wave signal source (3) through the microwave coaxial line.
2. the method for use generation microwave/millimeter wave photon 4 frequencys multiplication of installing according to claim 1; It is characterized in that the light that light source (2) sends passes through two parallel Mach-Zehnder modulators (1); Regulate microwave/millimeter wave signal source (3) and produce radiofrequency signal; Regulate the first voltage bias mouth (602), make first Mach-Zehnder modulators (6) be operated in the luminous power maximum point; Make second rf modulations mouth (701) ground connection, let light carrier pass through, but without ovennodulation; Regulate said phase voltage biasing mouthful (801); Make it and be operated in
; Make and introduced
radian phase shift through the spectrum of the said second rf modulations mouth (701) modulation output; Regulate the described second voltage bias mouth (702); Make the Output optical power of said two parallel Mach-Zehnder modulators (1) reach minimum value; Thereby make that the light carrier of two-way is just in time offset up and down; Finally; The output of said two parallel Mach-Zehnder modulators (1) is the even-order sideband of suppressed carrier; Behind said image intensifer (4) and said photodetector (5), take 4 pure frequency multiplication microwave/millimeter wave signals.
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| CN201210143744XA CN102710335A (en) | 2012-05-09 | 2012-05-09 | Device and method for generating microwave/millimeter wave photon frequency quadrupling |
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Cited By (12)
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| CN103199795A (en) * | 2013-04-23 | 2013-07-10 | 北京交通大学 | Independent and incoherent double-laser low-phase-noise 16-multiplying-frequency signal generation device |
| CN104022830A (en) * | 2014-01-21 | 2014-09-03 | 西安电子科技大学 | Device and method for generating eight frequency multiplication millimeter waves by utilizing Mach-Zehnder modulator |
| CN104332819A (en) * | 2014-09-02 | 2015-02-04 | 中国科学院半导体研究所 | Quadruplicated-frequency microwave signal generation system based on stimulated Brillouin scattering effect |
| CN104614719A (en) * | 2015-02-15 | 2015-05-13 | 中国科学院电子学研究所 | Laser radar broadband LFM signal generation and wide visual field receiving device |
| CN107919914A (en) * | 2017-12-20 | 2018-04-17 | 西安电子科技大学 | Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift |
| CN108092932A (en) * | 2017-12-25 | 2018-05-29 | 中国科学技术大学 | It is a kind of that microwave source is exported based on double sideband modulation device and the frequency-adjustable multi-frequency of frequency multiplier nonlinear effect |
| CN108761437A (en) * | 2018-04-08 | 2018-11-06 | 南京航空航天大学 | microwave photon polarization radar detection method and microwave photon polarization radar |
| CN109932851A (en) * | 2019-02-26 | 2019-06-25 | 浙江大学 | A kind of generation device based on coupled mode optoelectronic oscillation frequency comb random frequency multiplication signal |
| CN110224758A (en) * | 2019-06-27 | 2019-09-10 | 云南德通科技有限公司 | A kind of optical signal modulation system and its Transmission system |
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| CN103199795A (en) * | 2013-04-23 | 2013-07-10 | 北京交通大学 | Independent and incoherent double-laser low-phase-noise 16-multiplying-frequency signal generation device |
| CN103199795B (en) * | 2013-04-23 | 2015-12-23 | 北京交通大学 | A kind of independent incoherent double-laser low phase noise 16 frequency-doubled signal generating apparatus |
| CN104022830A (en) * | 2014-01-21 | 2014-09-03 | 西安电子科技大学 | Device and method for generating eight frequency multiplication millimeter waves by utilizing Mach-Zehnder modulator |
| CN104022830B (en) * | 2014-01-21 | 2017-04-26 | 西安电子科技大学 | Device for generating eight frequency multiplication millimeter waves by utilizing Mach-Zehnder modulator |
| CN104332819A (en) * | 2014-09-02 | 2015-02-04 | 中国科学院半导体研究所 | Quadruplicated-frequency microwave signal generation system based on stimulated Brillouin scattering effect |
| CN104614719A (en) * | 2015-02-15 | 2015-05-13 | 中国科学院电子学研究所 | Laser radar broadband LFM signal generation and wide visual field receiving device |
| CN104614719B (en) * | 2015-02-15 | 2017-08-15 | 中国科学院电子学研究所 | Laser radar Wideband LFM Signals are produced and wide visual field reception device |
| CN107919914A (en) * | 2017-12-20 | 2018-04-17 | 西安电子科技大学 | Quadruple signal is generated based on double-parallel modulator and realizes the device and method of microwave photon phase shift |
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| CN108092932B (en) * | 2017-12-25 | 2024-03-29 | 中国科学技术大学 | Frequency-adjustable multi-frequency output microwave source based on nonlinear effects of double-sideband modulator and frequency multiplier |
| CN108761437A (en) * | 2018-04-08 | 2018-11-06 | 南京航空航天大学 | microwave photon polarization radar detection method and microwave photon polarization radar |
| CN108761437B (en) * | 2018-04-08 | 2020-07-03 | 南京航空航天大学 | Microwave photon full polarization radar detection method and microwave photon full polarization radar |
| CN109932851A (en) * | 2019-02-26 | 2019-06-25 | 浙江大学 | A kind of generation device based on coupled mode optoelectronic oscillation frequency comb random frequency multiplication signal |
| CN110224758A (en) * | 2019-06-27 | 2019-09-10 | 云南德通科技有限公司 | A kind of optical signal modulation system and its Transmission system |
| CN110224758B (en) * | 2019-06-27 | 2022-05-24 | 云南德通科技有限公司 | Optical signal modulation system and transmission system thereof |
| CN110350981A (en) * | 2019-07-19 | 2019-10-18 | 南京航空航天大学 | A kind of Broadband FM microwave signal generation method and device based on photonics |
| CN113098618A (en) * | 2019-12-23 | 2021-07-09 | 西安电子科技大学 | Optical generation method of dual-band phase coding signal |
| CN114814331A (en) * | 2022-03-23 | 2022-07-29 | 电子科技大学 | Method for testing half-wave voltage of Mach-Zehnder modulator |
| CN114814331B (en) * | 2022-03-23 | 2023-03-21 | 电子科技大学 | Method for testing half-wave voltage of Mach-Zehnder modulator |
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Application publication date: 20121003 |