CN110505016A - It is a kind of that system and method is generated based on the electric vector millimeter wave for recommending modulator - Google Patents
It is a kind of that system and method is generated based on the electric vector millimeter wave for recommending modulator Download PDFInfo
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- CN110505016A CN110505016A CN201910727864.6A CN201910727864A CN110505016A CN 110505016 A CN110505016 A CN 110505016A CN 201910727864 A CN201910727864 A CN 201910727864A CN 110505016 A CN110505016 A CN 110505016A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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Abstract
System and method is generated based on the electric vector millimeter wave for recommending modulator the invention discloses a kind of, electric vector millimeter wave generates system and includes digital signal processor, outside cavity gas laser, recommends modulator and bias DC voltage source；The output of digital signal processor is terminated with the first analog-digital converter and the second analog-digital converter, the output end of first analog-digital converter and the second analog-digital converter is connected to the first radio driver and the second radio driver respectively, the first phase modulator and second phase modulator recommended in modulator are connect with the output end of the first radio driver and the second radio driver respectively, the output end for recommending modulator is successively connected to image intensifer, optical filter, photodetector and millimeter wave amplifier, the output of millimeter wave amplifier is terminated with the antenna for emitting electric vector millimeter-wave signal.The present invention can be applied effectively in ROF communication, generate wireless electric vector millimeter-wave signal, and using effect is good, convenient for promoting the use of.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to a kind of to generate system based on the electric vector millimeter wave for recommending modulator
System and method.
Background technique
Fiber optic communication has the characteristics that transmission range is long, message capacity is big, but due to wire transmission, cannot achieve broadly
Domain covers comprehensively, and full region covering theoretically may be implemented in wireless communication, but is limited to frequency spectrum resource, transmission capacity and transmission
Apart from limited.Bearing optical fiber radio frequency (Radio-over-fiber, ROF) combines the advantages of fiber optic communication and wireless communication, tool
Have that transmission range is long, transmission capacity is big, can be with mobile terminal real time communication.W-waveband (75GHz-110GHz) and terahertz wave band
(100GHz-10THz) has biggish spectral bandwidth, and is easy to generate electric vector signal using photoelectricity hybrid mode, in ROF
Preliminary application has been obtained in system.In the prior art, ultra wide band is had been realized in by single sideband modulation using I/Q modulator
ROF system application, still, since the insertion loss of I/Q modulator is big, DC offset voltage point is more, generally three, to light
The power loss of signal is larger, it is also necessary to carry out relaying amplification to optical signal in systems.
Summary of the invention
It is based on recommending in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind
The electric vector millimeter wave of modulator generates system, and structure is simple, and rationally, it is convenient to realize for design, can effectively apply logical in ROF
In letter, wireless electric vector millimeter-wave signal is generated, reduces optical signal power loss, using effect is good, convenient for promoting the use of.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: it is a kind of based on the electric vector for recommending modulator
Millimeter wave generates system, recommends including digital signal processor, outside cavity gas laser and with what the output end of outside cavity gas laser was connect
Modulator, and with the bias DC voltage source recommending modulator and connect；The output of the digital signal processor is terminated with
One analog-digital converter and the second analog-digital converter, the output of first analog-digital converter are terminated with the first radio driver, institute
The output for stating the second analog-digital converter is terminated with the second radio driver, for recommending modulator and including mutual symmetrical operation
One phase-modulator and second phase modulator, the first phase modulator are connect with the output end of the first radio driver,
The second phase modulator is connect with the output end of the second radio driver, and the output for recommending modulator is terminated with light and puts
Big device, the output of the image intensifer are terminated with optical filter, and the output of the optical filter is terminated with photodetector, described
The output of photodetector is terminated with millimeter wave amplifier, and the output of the millimeter wave amplifier is terminated with for by electric vector milli
Metric wave signal is emitted to the antenna of free space.
Above-mentioned is a kind of based on the electric vector millimeter wave generation system for recommending modulator, and the image intensifer is Er-doped fiber
Amplifier.
Above-mentioned is a kind of based on the electric vector millimeter wave generation system for recommending modulator, and the antenna is Cassegrain day
Line.
It is above-mentioned it is a kind of system is generated based on the electric vector millimeter wave for recommending modulator, the first phase modulator and straight
Cable connection is all made of between stream bias voltage source and between second phase modulator and bias DC voltage source.
It is above-mentioned it is a kind of system is generated based on the electric vector millimeter wave for recommending modulator, the outside cavity gas laser and recommend tune
Between device processed, recommend between modulator and image intensifer, between image intensifer and optical filter, optical filter and photodetector
Between and photodetector and millimeter wave amplifier between be all made of single mode optical fiber connection.
It is above-mentioned it is a kind of system is generated based on the electric vector millimeter wave for recommending modulator, the digital signal processor and the
Between one analog-digital converter and the second analog-digital converter, between the first analog-digital converter and the first radio driver, the second modulus
Between converter and the second radio driver, between the first radio driver and first phase modulator and the second radio frequency drive
Coaxial cable for high frequency connection is all made of between dynamic device and second phase modulator.
The invention also discloses it is a kind of based on recommend modulator electric vector millimeter wave generate method, this method include with
Lower step:
Step 1: the digital signal processor generates complex signal Data, and complex signal Data is separated into real part
Digital signal and imaginary part digital signal；
Step 2: the real part digital signal of complex signal Data is converted to analog signal by first analog-digital converter；
The imaginary part digital signal of complex signal Data is converted to analog signal by second analog-digital converter；
Step 3: the real part analog signal of signal Data is transferred to after being amplified by the first radio driver recommends modulator
First phase modulator in；The imaginary analog signal of signal Data is transferred to after being amplified by the second radio driver and recommends tune
In the second phase modulator of device processed；
Step 4: the outside cavity gas laser generation continuous laser signal is transferred to by single mode optical fiber and is recommended in modulator,
Continuous laser signal is divided into the continuous optical signal in road and the lower continuous optical signal in road；
Step 5: the upper continuous optical signal transmission in road is into first phase modulator, by the real part analog signal of signal Data
Modulation；The lower continuous optical signal transmission in road is modulated into second phase modulator by the imaginary analog signal of signal Data；
Step 6: modulated two ways of optical signals, in the output end superposition for recommending modulator, superimposed signal indicates are as follows:
Wherein, R is the photoelectric respone coefficient for recommending modulator, and Real (Data) is the plural number generated after Digital Signal Processing
The real part of form modulating vector signal, Imaga (Data) are the plural form modulating vector signal that generates after Digital Signal Processing
Imaginary part, i is imaginary number, and A is DC voltage, and B is the vector signal of baseband modulation, w1For the angular frequency of subcarrier 1, w2For sub- load
The angular frequency of wave 2, t are the time, and e is the bottom of natural logrithm, and DC is the light output for recommending modulator in no modulated signal；
Step 7: the optical signal transmission after recommending modulator into image intensifer, carries out signal amplification；
Step 8: carrying out filtered optical signal by the amplified optical signal transmission of image intensifer into optical filter；
Step 9: carrying out photoelectric conversion, photoelectricity by the filtered optical signal transmission of optical filter into photodetector
It is electric vector millimeter-wave signal that the beat signal that beat effect generates occurs when conversion；
Step 10: the electric vector millimeter-wave signal being converted to by photodetector is transferred in millimeter wave amplifier,
Carry out the amplification of electric vector millimeter-wave signal；
Step 11: being transmitted by the amplified electric vector millimeter-wave signal of millimeter wave amplifier by coaxial cable for high frequency
To antenna, electric vector millimeter-wave signal is emitted to free space using antenna, obtains wireless electric vector millimeter-wave signal.
Compared with the prior art, the present invention has the following advantages:
1, electric vector millimeter wave of the invention generation system structure is simple, and rationally, it is convenient to realize for design.
2, the present invention substitutes traditional I/Q modulator using modulator is recommended, and realizes the generation of electric vector millimeter wave, recommends
Modulator only needs a DC offset voltage, and insertion loss is the one third of I/Q modulator, is guaranteeing bandwidth free of losses premise
Under, control is simple, reduces optical signal power loss.
3, the present invention can be applied effectively in ROF communication, generate wireless electric vector millimeter-wave signal, using effect
It is good, convenient for promoting the use of.
In conclusion electric vector millimeter wave of the invention generates, system structure is simple, and rationally, it is convenient to realize for design, can
It effectively applies in ROF communication, generates wireless electric vector millimeter-wave signal, reduce optical signal power loss, using effect is good,
Convenient for promoting the use of.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is that electric vector millimeter wave of the invention generates system principle diagram.
Description of symbols:
1-digital signal processor；2-outside cavity gas lasers；3-bias DC voltage sources；
4-the first analog-digital converter；5-the second analog-digital converter；6-the first radio driver；
7-the second radio driver；8-first phase modulators；9-second phase modulators；
10-image intensifers；11-optical filters；12-photodetectors；
13-millimeter wave amplifiers；14-antennas.
Specific embodiment
As shown in Figure 1, of the invention generated at system, including digital signal based on the electric vector millimeter wave for recommending modulator
Reason device 1, outside cavity gas laser 2 and what is connect with the output end of outside cavity gas laser 2 recommend modulator, and connect with modulator is recommended
Bias DC voltage source 3；The output of the digital signal processor 1 is terminated with the first analog-digital converter 4 and the second modulus turns
Parallel operation 5, the output of first analog-digital converter 4 are terminated with the first radio driver 6, second analog-digital converter 5 it is defeated
It is terminated with the second radio driver 7 out, it is described to recommend the first phase modulator 8 and second that modulator includes mutual symmetrical operation
Phase-modulator 9, the first phase modulator 8 are connect with the output end of the first radio driver 6, the second phase modulation
Device 9 is connect with the output end of the second radio driver 7, and the output for recommending modulator is terminated with image intensifer 10, the light
The output of amplifier 10 is terminated with optical filter 11, and the output of the optical filter 11 is terminated with photodetector 12, the light
The output of electric explorer 12 is terminated with millimeter wave amplifier 13, and the output of the millimeter wave amplifier 13 is terminated with for by electric vector
Amount millimeter-wave signal is emitted to the antenna 14 of free space.
When it is implemented, recommending modulator by the first phase modulator 8 of upper and lower position and 9 groups of second phase modulator
At the first phase modulator 8 and the mutual symmetrical operation of second phase modulator 9 work when recommending modulator in linear zone
When, bias DC voltage source 3 is biased on the orthogonal points for recommending modulator, recommends that modulator shares 4 input ports and 1 is defeated
Exit port, the outside cavity gas laser 2, bias DC voltage source 3, the first radio driver 6 and the second radio driver 7 respectively with
4 input ports connection of modulator is recommended, the image intensifer 10 is connect with 1 output port for recommending modulator.
In the present embodiment, the image intensifer 10 is erbium-doped fiber amplifier.
In the present embodiment, the antenna 14 is Cassegrain antenna.
In the present embodiment, between the first phase modulator 8 and bias DC voltage source 3 and second phase is modulated
Common cable connection is all made of between device 9 and bias DC voltage source 3.
In the present embodiment, the outside cavity gas laser 2 and recommend between modulator, recommend modulator and image intensifer 10 it
Between, between image intensifer 10 and optical filter 11, between optical filter 11 and photodetector 12 and photodetector 12 with
Single mode optical fiber connection is all made of between millimeter wave amplifier 13.
In the present embodiment, between the digital signal processor 1 and the first analog-digital converter 4 and the second analog-digital converter 5,
Between first analog-digital converter 4 and the first radio driver 6, between the second analog-digital converter 5 and the second radio driver 7,
Between one radio driver 6 and first phase modulator 8 and between the second radio driver 7 and second phase modulator 9
It is connected using coaxial cable for high frequency.
The method generated based on the electric vector millimeter wave for recommending modulator of the invention the following steps are included:
Step 1: the digital signal processor 1 generates complex signal Data, and complex signal Data is separated into real part
Digital signal and imaginary part digital signal；
Step 2: the real part digital signal of complex signal Data is converted to analog signal by first analog-digital converter 4；
The imaginary part digital signal of complex signal Data is converted to analog signal by second analog-digital converter 5；
Step 3: the real part analog signal of signal Data is transferred to after being amplified by the first radio driver 6 recommends modulation
In the first phase modulator 8 of device；The imaginary analog signal of signal Data is transferred to after being amplified by the second radio driver 7 and pushes away
It draws in the second phase modulator 9 of modulator；
Step 4: the generation of the outside cavity gas laser 2 continuous laser signal is transferred to by single mode optical fiber and is recommended in modulator,
Continuous laser signal is divided into the continuous optical signal in road and the lower continuous optical signal in road；
Step 5: the upper continuous optical signal transmission in road is into first phase modulator 8, by the real part analog signal of signal Data
Modulation；The lower continuous optical signal transmission in road is modulated into second phase modulator 9 by the imaginary analog signal of signal Data；
Step 6: modulated two ways of optical signals, in the output end superposition for recommending modulator, superimposed signal indicates are as follows:
Wherein, R is the photoelectric respone coefficient for recommending modulator, and Real (Data) is the plural number generated after Digital Signal Processing
The real part of form modulating vector signal, Imaga (Data) are the plural form modulating vector signal that generates after Digital Signal Processing
Imaginary part, i is imaginary number, and A is DC voltage, and B is the vector signal of baseband modulation, w1For the angular frequency of subcarrier 1, w2For sub- load
The angular frequency of wave 2, t are the time, and e is the bottom of natural logrithm, and DC is the light output for recommending modulator in no modulated signal；
Step 7: the optical signal transmission after recommending modulator into image intensifer 10, carries out signal amplification；
Step 8: carrying out filtered optical signal by the amplified optical signal transmission of image intensifer 10 into optical filter 11；
Step 9: photoelectric conversion is carried out by the filtered optical signal transmission of optical filter 11 into photodetector 12,
It is electric vector millimeter-wave signal that the beat signal that beat effect generates occurs when photoelectric conversion；
When it is implemented, upper and lower two sideband signals carry out that beat effect, the signal after beat frequency can occur when photoelectric conversion
Frequency depends on the difference on the frequency of upper and lower two sideband signals, and the signal after photodetector 12 becomes electric signal, light millimeter
The amplitude and phase of wave signal can be modulated by digital signal processor 1, include to adjust in obtained millimeter-wave signal
The information of width and phase modulation, as a light vector millimeter-wave signal, after photodetector 12, light vector millimeter-wave signal turns
It is changed to electric vector millimeter-wave signal.
Step 10: the electric vector millimeter-wave signal being converted to by photodetector 12 is transferred to millimeter wave amplifier 13
In, carry out the amplification of electric vector millimeter-wave signal；
Step 11: being passed by the amplified electric vector millimeter-wave signal of millimeter wave amplifier 13 by coaxial cable for high frequency
It is defeated to arrive antenna 14, electric vector millimeter-wave signal is emitted to free space using antenna 14, obtains wireless electric vector millimeter wave
Signal.
In order to verify the technical effect that the present invention can generate, the electric vector millimeter wave for recommending modulator is given to the present invention
The electric vector millimeter-wave signal that generation system generates, has carried out ROF system transmission experiment, is produced in transmitting terminal using QPSK agreement
4Gbaud, the light vector millimeter-wave signal of 80GHz are given birth to, wherein the light vector millimeter-wave signal generated transmits in single mode optical fiber
80km, light vector millimeter-wave signal become electric vector millimeter-wave signal, send out by Cassegrain antenna after photoelectric conversion
It penetrates, in free space transmission 50cm；In receiving end, wireless signal is received using identical card plug brother human relations antenna, this
The frequency of ground oscillator is that vector millimeter-wave signal is down-converted to 8GHz, finally, utilizing high speed mould after mixing by 72GHz
Number converter (ADC) is sampled, and Digital Signal Processing mode is recycled to demodulate signal, realizes answering for ROF communication
With.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (7)
1. a kind of generate system based on the electric vector millimeter wave for recommending modulator, it is characterised in that: including digital signal processor
(1), outside cavity gas laser (2) and what is connect with the output end of outside cavity gas laser (2) recommend modulator, and connect with modulator is recommended
The bias DC voltage source (3) connect；The output of the digital signal processor (1) is terminated with the first analog-digital converter (4) and
The output of two analog-digital converters (5), first analog-digital converter (4) is terminated with the first radio driver (6), second mould
The output of number converter (5) is terminated with the second radio driver (7), first for recommending modulator and including mutual symmetrical operation
Phase-modulator (8) and second phase modulator (9), the first phase modulator (8) are defeated with the first radio driver (6)
Outlet connection, the second phase modulator (9) connect with the output end of the second radio driver (7), described to recommend modulator
Output be terminated with image intensifer (10), the output of the image intensifer (10) is terminated with optical filter (11), light filtering
The output of device (11) is terminated with photodetector (12), and the output of the photodetector (12) is terminated with millimeter wave amplifier
(13), the output of the millimeter wave amplifier (13) is terminated with the day for electric vector millimeter-wave signal to be emitted to free space
Line (14).
2. described in accordance with the claim 1 a kind of based on the electric vector millimeter wave generation system for recommending modulator, it is characterised in that:
The image intensifer (10) is erbium-doped fiber amplifier.
3. described in accordance with the claim 1 a kind of based on the electric vector millimeter wave generation system for recommending modulator, it is characterised in that:
The antenna (14) is Cassegrain antenna.
4. described in accordance with the claim 1 a kind of based on the electric vector millimeter wave generation system for recommending modulator, it is characterised in that:
Between the first phase modulator (8) and bias DC voltage source (3) and second phase modulator (9) and direct current biasing
Voltage source is all made of cable connection between (3).
5. described in accordance with the claim 1 a kind of based on the electric vector millimeter wave generation system for recommending modulator, it is characterised in that:
The outside cavity gas laser (2) and recommend between modulator, recommend between modulator and image intensifer (10), image intensifer (10) with
Between optical filter (11), between optical filter (11) and photodetector (12) and photodetector (12) and millimeter wave
Single mode optical fiber connection is all made of between amplifier (13).
6. described in accordance with the claim 1 a kind of based on the electric vector millimeter wave generation system for recommending modulator, it is characterised in that:
Between the digital signal processor (1) and the first analog-digital converter (4) and the second analog-digital converter (5), the first analog-to-digital conversion
Between device (4) and the first radio driver (6), between the second analog-digital converter (5) and the second radio driver (7), first penetrate
Between frequency driver (6) and first phase modulator (8) and the second radio driver (7) and second phase modulator (9) it
Between be all made of coaxial cable for high frequency connection.
7. a kind of method for carrying out the generation of electric vector millimeter wave using system as described in claim 1, it is characterised in that: this method
The following steps are included:
Step 1: the digital signal processor (1) generates complex signal Data, and complex signal Data is separated into real part number
Word signal and imaginary part digital signal；
Step 2: the real part digital signal of complex signal Data is converted to analog signal by first analog-digital converter (4)；Institute
It states the second analog-digital converter (5) and the imaginary part digital signal of complex signal Data is converted into analog signal；
Step 3: the real part analog signal of signal Data is transferred to after being amplified by the first radio driver (6) recommends modulator
First phase modulator (8) in；The imaginary analog signal of signal Data is transferred to after being amplified by the second radio driver (7)
It recommends in the second phase modulator (9) of modulator；
Step 4: outside cavity gas laser (2) the generation continuous laser signal is transferred to by single mode optical fiber and is recommended in modulator, even
Continuous laser signal is divided into the continuous optical signal in road and the lower continuous optical signal in road；
Step 5: the upper continuous optical signal transmission in road is in first phase modulator (8), by the real part analog signal tune of signal Data
System；The lower continuous optical signal transmission in road is modulated in second phase modulator (9) by the imaginary analog signal of signal Data；
Step 6: modulated two ways of optical signals, in the output end superposition for recommending modulator, superimposed signal indicates are as follows:
Wherein, R is the photoelectric respone coefficient for recommending modulator, and Real (Data) is the plural form generated after Digital Signal Processing
The real part of modulating vector signal, Imaga (Data) are the void of the plural form modulating vector signal generated after Digital Signal Processing
Portion, i are imaginary number, and A is DC voltage, and B is the vector signal of baseband modulation, w1For the angular frequency of subcarrier 1, w2For subcarrier 2
Angular frequency, t are the time, and e is the bottom of natural logrithm, and DC is the light output for recommending modulator in no modulated signal；
Step 7: the optical signal transmission after recommending modulator in image intensifer (10), carries out signal amplification；
Step 8: carrying out filtered optical signal by image intensifer (10) amplified optical signal transmission in optical filter (11)；
Step 9: photoelectric conversion is carried out by optical filter (11) filtered optical signal transmission in photodetector (12),
It is electric vector millimeter-wave signal that the beat signal that beat effect generates occurs when photoelectric conversion；
Step 10: being transferred to millimeter wave amplifier (13) by the electric vector millimeter-wave signal that photodetector (12) is converted to
In, carry out the amplification of electric vector millimeter-wave signal；
Step 11: being transmitted by the amplified electric vector millimeter-wave signal of millimeter wave amplifier (13) by coaxial cable for high frequency
To antenna (14), electric vector millimeter-wave signal is emitted to free space using antenna (14), obtains wireless electric vector millimeter
Wave signal.
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| CN201910727864.6A CN110505016B (en) | 2019-08-08 | 2019-08-08 | Electric vector millimeter wave generation method based on push-pull modulator |
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|---|---|---|---|
| CN201910727864.6A CN110505016B (en) | 2019-08-08 | 2019-08-08 | Electric vector millimeter wave generation method based on push-pull modulator |
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| CN110505016B CN110505016B (en) | 2021-09-03 |
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| CN111224720A (en) * | 2020-02-25 | 2020-06-02 | 西安邮电大学 | Terahertz vector signal generation system and method of cascade connection of dual-intensity modulator |
| CN112350777A (en) * | 2020-10-29 | 2021-02-09 | 复旦大学 | Double-vector millimeter wave generation system and method based on push-pull modulator |
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| CN112350777A (en) * | 2020-10-29 | 2021-02-09 | 复旦大学 | Double-vector millimeter wave generation system and method based on push-pull modulator |
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| Publication number | Publication date |
|---|---|
| CN110505016B (en) | 2021-09-03 |
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Application publication date: 20191126 Assignee: XI'AN SUOWEI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Assignor: XI'AN University OF POSTS & TELECOMMUNICATIONS Contract record no.: X2022980017944 Denomination of invention: A method of generating electric vector millimeter wave based on push-pull modulator Granted publication date: 20210903 License type: Common License Record date: 20221011 |