CN104639253A - Generation method and device of microwave signal with differential phase code - Google Patents
Generation method and device of microwave signal with differential phase code Download PDFInfo
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Abstract
The invention discloses a generation method and device of a microwave signal with a differential phase code, and belongs to the technical field of communication, radar and microwave photonics. The device comprises a laser, a first electro-optical modulator, a second electro-optical modulator, a cascaded Mach-Zehnder interferometer, a balanced photoelectric detector, a microwave signal source and a code signal generator. The method specifically comprises the following steps: performing suppressed carrier modulation on direct current light by using the first electro-optical modulator to obtain two subcarriers; modulating the phase of the code signal on the abovementioned two subcarriers by using the second electro-optical modulator; separating the two subcarriers by using the cascaded Mach-Zehnder interferometer and introducing a proper time delay difference; performing photoelectric detection on two paths of light signals output by the cascaded Mach-Zehnder interferometer by using the balanced photoelectric detector to obtain the microwave signal with the differential phase code. The method and the device have the main advantage that the microwave signal with the differential phase code can be generated, and has the advantages of high carrier frequency, high bandwidth and no low-frequency noise interference.
Description
Technical field
The present invention relates to a kind of microwave signal generating method and device of differential phase coding, particularly relate to a kind of microwave signal generating method and device of the differential phase coding based on microwave photon technology realization, belong to communication, radar and Microwave photonics field.
Background technology
Phase code or differential phase coding are modulation formats conventional in microwave telecommunication system, are also realize pulse compression in radar system to improve one of key technology of range resolution ratio.Especially, differential phase coding form is used can to significantly improve the reliability of microwave telecommunication system.Along with communication and the carrier frequency of the phase-coded signal required for the system such as radar constantly promote, bandwidth constantly increases, how to produce high frequency, the phase-coded signal of large bandwidth become the problem that communication and radar system need solution badly.
Traditional phase-coded signal is produced by electronic technology, but the Bandwidth-Constrained of signal and carrier frequency is lower, can signal quality deteriorates be caused when using the method promotion signal bandwidth of mixing and frequency, being thus difficult to the demand meeting future communications and radar system.Compared with employing electronic technology, utilize microwave photon technology produce the microwave signal of phase code have frequency high, be with the advantages such as roomy, loss is low, volume is little, anti-electromagnetic interference capability is strong, be subject to the great attention of people.In recent years, researcher proposes the phase-coded signal production method of many kinds based on microwave photon technology, but usually there is following several respects problem in these methods at present: the first, owing to following square-law detection when photodetector realizes opto-electronic conversion, more low-frequency component is there is in the phase-coded signal obtained, filter must be used to be removed by low-frequency component before signal is launched, system complexity is raised; The carrier frequency of the phase-coded signal the second, obtained is identical with the microwave signal source frequency of drive system, and the phase-coded signal that therefore will produce high carrier frequency necessarily uses the microwave signal source of high frequency, and system cost is increased; Three, the microwave signal of differential phase coding is produced as needed, must at the differential coding of electrical domain first settling signal, then as the input of microwave photon system, and original code signal can not be utilized as input directly to produce the microwave signal of differential phase coding.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of microwave signal generating method and device of the differential phase coding based on microwave photon technology realization, utilize original code signal directly to produce the microwave signal with differential phase coding as system input.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A microwave signal generating method for differential phase coding, laser produces direct current light signal and inputs the first electrooptic modulator; Microwave signal source produces single-frequency microwave signal and drives the first electrooptic modulator; Utilize the first electrooptic modulator to carry out carrier-suppressed double sideband modulation to described direct current light signal and obtain two sub-carrier light signals, described two sub-carrier light signals enter the second electrooptic modulator; Code signal generator produces binary-coding signal and enters the second electrooptic modulator as drive singal; In the second electrooptic modulator, the binary-coding signal utilizing code signal generator to produce carries out phase-modulation to two sub-carrier light signals simultaneously; The light signal that second electrooptic modulator exports enters cascading Mach Zeng Deer interferometer; Cascading Mach Zeng Deer interferometer is made up of first order Mach-Zehnder interferometers and second level Mach-Zehnder interferometers; Described first order Mach-Zehnder interferometers introduces delay inequality to the light signal that the second electrooptic modulator exports, first order Mach-Zehnder interferometers two outputs are made to have complementary comb filtering characteristic, thus by two sub-carrier light signals separately, after second level Mach-Zehnder interferometers introduces delay inequality to separate two sub-carrier light signals that first order Mach-Zehnder interferometers exports, two sub-carrier light signals interfere with each other the two ways of optical signals obtaining luminous intensity complementation and export; Wherein: the delay inequality introduced in first order Mach-Zehnder interferometers is τ
1=1/ (4f
rF), f
rFfor the single-frequency microwave signal frequency that microwave signal source produces; The delay inequality introduced in the Mach-Zehnder interferometers of the described second level is τ
2=1/B, B are the speed of the binary-coding signal that code signal generator produces; The two ways of optical signals of the luminous intensity complementation that second level Mach-Zehnder interferometers exports delivers to two inputs of balance photodetector respectively; The output of balance photodetector is the microwave signal of differential phase coding.
Further, utilize phase-modulator to be modulated on two sub-carrier light signals by the binary-coding signal phase that code signal generator produces, wherein the modulation depth of phase-modulator is π.
A microwave signal generation device for differential phase coding, comprising: laser, the first electrooptic modulator, the second electrooptic modulator, cascading Mach Zeng Deer interferometer, balance photodetector, microwave signal source and code signal generator; Two wideband photodetectors are provided with in described balance photodetector; The output of described laser connects the input of the first electrooptic modulator; The output of described first electrooptic modulator connects the input of the second electrooptic modulator; Along the second electrooptic modulator output side signal to connect successively cascading Mach Zeng Deer interferometer and balance photodetector; The output of described microwave signal source is connected with the driving signal input of the first electrooptic modulator; The output of described code signal generator is connected with the driving signal input of the second electrooptic modulator.
Further, described first electrooptic modulator adopts broadband MZ Mach-Zehnder.
Further, described second electrooptic modulator is broad band electrooptic phase-modulator.
Beneficial effect: the microwave signal generating method of a kind of differential phase coding provided by the invention and device:
(1) the final differential phase coding microwave signal carrier frequency produced is two times of the microwave source signal frequency of driving first electrooptic modulator, and low frequency device thus can be utilized to produce high-frequency microwave signal.
(2) without the need to electrical domain differential coding module, original code signal can be utilized directly to produce the microwave signal with differential phase coding as system input.
(3) obtain difference output by balance photodetection, the low frequency background noise interference in output signal can be removed, and increase the power of phase code microwave signal.
Accompanying drawing explanation
Fig. 1 is the structural representation of the microwave signal generation device of differential phase coding in the present invention;
Fig. 2 is the experimental result of the microwave signal being produced differential phase coding by embodiment:
Fig. 2 (a) is the normalization waveform of the differential phase coding signal of generation;
Fig. 2 (b) is original binary-coding signal waveform;
Fig. 2 (c) is through time delay τ
2after binary-coding signal waveform;
The phase information of Fig. 2 (d) for extracting from the phase code microwave signal produced according to Hilbert transform.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
A microwave signal generation device for differential phase coding, comprising: laser, the first electrooptic modulator, the second electrooptic modulator, cascading Mach Zeng Deer interferometer, balance photodetector, microwave signal source and code signal generator; The output of described laser connects the input of the first electrooptic modulator; The output of described first electrooptic modulator connects the input of the second electrooptic modulator; Along the second electrooptic modulator output side signal to connect successively cascading Mach Zeng Deer interferometer and balance photodetector; The output of described microwave signal source is connected with the driving signal input of the first electrooptic modulator; The output of described code signal generator is connected with the driving signal input of the second electrooptic modulator.
First electrooptic modulator is preferably broadband MZ Mach-Zehnder, the intensity modulated transfer function minimum point of the corresponding MZ Mach-Zehnder of its bias voltage; Described second electrooptic modulator is preferably broad band electrooptic phase-modulator, the binary-coding signal produced by code signal generator drives, realizing phase modulation depth is π, i.e. the varying level of corresponding binary-coding signal, the phase by pi of the light signal that the second electrooptic modulator exports; Described cascading Mach Zeng Deer interferometer is made up of two-stage Mach-Zehnder interferometers, this cascading Mach Zeng Deer interferometer has an optical signal input mouth and two light signal output end mouths, wherein interferes arm to be τ to the delay inequality of input optical signal for two of first order Mach-Zehnder interferometers
1=1/ (4f
rF) (f
rFfor driving the single-frequency microwave signal frequency of the first electrooptic modulator, unit is Hz), described delay inequality refers to that interference arm in cascading Mach Zeng Deer interferometer is to the difference of the time delay of light signal, supposes to interfere amount of delay on arm to be (A+ τ for one in first order Mach-Zehnder interferometers
1), another interferes arm amount of delay to be A, interferes the delay inequality of arm to be τ for two
1.Two delay inequalities of interfering arm to be introduced the light signal that first order Mach-Zehnder interferometers exports of second level Mach-Zehnder interferometers are τ
2=1/B (B is the binary-coding signal rate of driving second electrooptic modulator, and unit is bit/s), in like manner: suppose that one in the Mach-Zehnder interferometers of the second level is interfered amount of delay on arm to be (Q+ τ
2), another interferes arm amount of delay to be Q, and two namely in the Mach-Zehnder interferometers of second level delay inequalities of interfering arm are τ
2; Described balance photodetector comprises two wideband photodetectors, and the output signal of this balance photodetector is the difference that two wideband photodetectors export the signal of telecommunication.
The microwave signal generating method in the present invention with differential phase coding is specially: the direct current light signal utilizing the first electrooptic modulator to be produced by laser carries out carrier-suppressed double sideband modulation and obtains two sub-carrier light signals, recycle binary-coding signal that code signal generator produces by the second electrooptic modulator simultaneously phase-modulation on above two sub-carrier light signals, wherein phase modulation depth is π, the i.e. varying level of corresponding binary-coding signal, the phase by pi of the second electrooptic modulator output optical signal; The light signal that second electrooptic modulator exports is input to the input of cascading Mach Zeng Deer interferometer, and cascading Mach Zeng Deer interferometer is made up of first order Mach-Zehnder interferometers and second level Mach-Zehnder interferometers; The light signal that second electrooptic modulator exports is after first order Mach-Zehnder interferometers, and two subcarriers are exported by two outputs separately and respectively by first order Mach-Zehnder interferometers; The two ways of optical signals that first order Mach-Zehnder interferometers exports is introduced after the delay inequality relevant to binary-coding signal rate through second level Mach-Zehnder interferometers, interferes with each other the two ways of optical signals obtaining luminous intensity complementation and exports; The two ways of optical signals of the luminous intensity complementation that second level Mach-Zehnder interferometers exports is input to two optical signal input of balance photodetection, and the output of balance photodetector is the microwave signal of differential phase coding.
The microwave signal of the differential phase coding that the present invention produces has the two-value phase information of 0, π, and its carrier frequency is 2f
rF(f
rFfor driving the microwave signal frequency of the first electrooptic modulator).The microwave signal phase coding that the present invention realizes, differential coding form is in a ratio of with original binary-coding signal, that is: the microwave signal phase exported when original binary-coding signal adjacent bit is identical is 0, and the microwave signal phase exported when original binary-coding signal adjacent bit is different is π.
In order to make public understanding technical solution of the present invention, below to the principle of said apparatus for the first electrooptic modulator be broadband MZ Mach-Zehnder, the second electrooptic modulator is introduced for broad band electrooptic phase-modulator:
The direct current light signal that laser produces is E
c(t)=E
0exp (j2 π f
0t), wherein E
0for amplitude, f
0for frequency.This direct current light inputs the first electrooptic modulator, i.e. MZ Mach-Zehnder, and the drive singal of MZ Mach-Zehnder is the single-frequency microwave signal that microwave source produces.By the minimum point regulating the bias voltage of MZ Mach-Zehnder to correspond to the intensity modulated transfer function of MZ Mach-Zehnder, realize modulating the carrier-suppressed double sideband of direct current light signal, obtain ± two, 1 rank light modulation sideband is as two sub-carrier light signals.If the single-frequency microwave signal that microwave signal source produces is E
rF(t)=Vcos (2 π f
rFt), wherein V is amplitude, f
rFfor the frequency of single-frequency microwave signal, two sub-carrier light signals that MZ Mach-Zehnder exports are:
E
1(t)＝E
1exp[j2π(f
0-f)t]+E
1exp[j2π(f
0+f)t] (1)
Wherein E
1it is the amplitude of two subcarriers.Two sub-carrier signals that MZ Mach-Zehnder exports are input to the second electrooptic modulator, i.e. electro-optic phase modulator, and the binary-coding signal utilizing code signal generator to produce carries out phase-modulation to two subcarriers simultaneously.Suppose that the binary-coding signal that code signal generator produces is g (t), its value is ' 0 ' or ' 1 ', and speed is B bit/s.Regulate the amplitude of binary-coding signal, make the modulation depth of phase-modulator be π, then the light signal exported through electro-optic phase modulator is:
Wherein
for the light signal phase place change that electric light phase-modulation causes, and
The light signal that electro-optic phase modulator exports is input to cascading Mach Zeng Deer interferometer.Arm is interfered to be τ to the delay inequality of light signal for two of first order Mach-Zehnder interferometers
1=1/ (4f
rF), then the luminous intensity transfer function of two outputs of first order Mach-Zehnder interferometers is respectively:
Wherein f is the frequency of the light signal of input first order Mach-Zehnder interferometers.Through type (3), (4) can find that two outputs of first order Mach-Zehnder interferometers have complementary comb filtering characteristic.Therefore, utilize first order Mach-Zehnder interferometers by two sub-carrier light signals through phase-modulation separately, and to export from two outputs of first order Mach-Zehnder interferometers respectively, the two ways of optical signals obtained is:
Two outputs of first order Mach-Zehnder interferometers interfere arm to be connected with two of second level Mach-Zehnder interferometers.The light delay inequality of the two-arm of second level Mach-Zehnder interferometers is τ
2=1/B, the light signal of two outputs of second level Mach-Zehnder interferometers is respectively:
Formula (7) and formula (8) two ways of optical signals are input to balance photodetector.Balance photodetector is made up of two photodetectors, and the output current of these two balance photodetectors is respectively:
Wherein α is the responsiveness of balance photodetector.Be finally the difference of formula (9) and formula (10) from the current signal of the output of balance photodetector:
From formula (11), balance photodetector exports as carrier frequency is 2f
rFmicrowave signal, phase place by
determine: the microwave signal phase exported when the adjacent code element of binary-coding signal that code signal generator produces is identical is 0, and the microwave signal phase exported time different is π, namely achieves differential phase coding.Can also be found by formula (11), the differential phase coding microwave signal obtained without low-frequency interference signal, and obtains 2 times of signal when signal amplitude is and adopts single photodetector.Due to the first electrooptic modulator, the second electrooptic modulator is broad band electrooptic modulator, balance photodetector is wideband balance photodetector, and apparatus of the present invention can produce the phase code microwave signal of high carrier frequency, large bandwidth.
Fig. 2 is the experimental result of the microwave signal being produced differential phase coding by above embodiment.Drive the microwave source signal frequency of the first electrooptic modulator to be 8.7GHz in experiment, the binary-coding signal rate 1.036Gb/s that code signal generator produces, coded system is " 11001100 ".The two-arm time delay of first order Mach Zehnder interferometry is 28.7ps, and the two-arm time delay of second level Mach-Zehnder interferometers is 965ps.The carrier frequency of the phase code microwave signal produced is 17.4GHz, and its waveform is as shown in Fig. 2 (a).For the ease of observation, Fig. 2 (b), (c) be respectively code signal generator produce binary-coding signal waveform and binary-coding signal through time delay τ
2after waveform schematic diagram.Fig. 2 (d) is according to Hilbert Transformation Principle, is extracted the phase information of phase code microwave signal by Matlab software for calculation.Can find, corresponding to initial code signal " 11001100 ", the microwave signal phase of generation is " 0 π 0 π 0 π 0 π ", namely achieves differential phase coding.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a microwave signal generating method for differential phase coding, is characterized in that: laser produces direct current light signal and inputs the first electrooptic modulator; Microwave signal source produces single-frequency microwave signal and drives the first electrooptic modulator; Utilize the first electrooptic modulator to carry out carrier-suppressed double sideband modulation to described direct current light signal and obtain two sub-carrier light signals, described two sub-carrier light signals enter the second electrooptic modulator; Code signal generator produces binary-coding signal and enters the second electrooptic modulator as drive singal; In the second electrooptic modulator, the binary-coding signal utilizing code signal generator to produce carries out phase-modulation to two sub-carrier light signals simultaneously; The light signal that second electrooptic modulator exports enters cascading Mach Zeng Deer interferometer; Cascading Mach Zeng Deer interferometer is made up of first order Mach-Zehnder interferometers and second level Mach-Zehnder interferometers; Described first order Mach-Zehnder interferometers introduces delay inequality to the light signal that the second electrooptic modulator exports, thus by two sub-carrier light signals separately, after second level Mach-Zehnder interferometers introduces delay inequality to separate two sub-carrier light signals that first order Mach-Zehnder interferometers exports, two sub-carrier light signals interfere with each other the two ways of optical signals obtaining luminous intensity complementation and export; Wherein: the delay inequality introduced in first order Mach-Zehnder interferometers is τ
1=1/ (4f
rF), f
rFfor the single-frequency microwave signal frequency that microwave signal source produces; The delay inequality introduced in the Mach-Zehnder interferometers of the described second level is τ
2=1/B, B are the speed of the binary-coding signal that code signal generator produces; The light signal of the two-way luminous intensity complementation that second level Mach-Zehnder interferometers exports delivers to two inputs of balance photodetector respectively; The output of balance photodetector is the microwave signal of differential phase coding.
2. the microwave signal generating method of a kind of differential phase coding according to claim 1, it is characterized in that: utilize phase-modulator to be modulated on two sub-carrier light signals by the binary-coding signal phase that code signal generator produces, wherein the modulation depth of phase-modulator is π.
3. a microwave signal generation device for differential phase coding, is characterized in that: comprising: laser, the first electrooptic modulator, the second electrooptic modulator, cascading Mach Zeng Deer interferometer, balance photodetector, microwave signal source and code signal generator; Two wideband photodetectors are provided with in described balance photodetector; The output of described laser connects the input of the first electrooptic modulator; The output of described first electrooptic modulator connects the input of the second electrooptic modulator; Along the second electrooptic modulator output side signal to connect successively cascading Mach Zeng Deer interferometer and balance photodetector; The output of described microwave signal source is connected with the driving signal input of the first electrooptic modulator; The output of described code signal generator is connected with the driving signal input of the second electrooptic modulator.
4. the microwave signal generation device of a kind of differential phase coding according to claim 3, is characterized in that: described first electrooptic modulator adopts broadband MZ Mach-Zehnder.
5. the microwave signal generation device of a kind of differential phase coding according to claim 3, is characterized in that: described second electrooptic modulator is broad band electrooptic phase-modulator.
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| CN109521520A (en) * | 2019-01-10 | 2019-03-26 | 安徽问天量子科技股份有限公司 | A kind of integrated electric signal delayer of waveguide |
| CN109932691A (en) * | 2019-03-27 | 2019-06-25 | 南京航空航天大学 | Microwave photon radar-communicating integral method and device |
| CN109932691B (en) * | 2019-03-27 | 2020-07-10 | 南京航空航天大学 | Microwave photon radar-communication integrated method and device |
| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN113098598A (en) * | 2021-04-07 | 2021-07-09 | 金陵科技学院 | Microwave photon link small signal model analysis method |
| CN113098598B (en) * | 2021-04-07 | 2022-09-23 | 金陵科技学院 | Microwave photon link small signal model analysis method |
| CN114189288A (en) * | 2021-11-15 | 2022-03-15 | 中国人民解放军国防科技大学 | Optical signal intensity modulation characteristic blanking device and method |
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