CN112350777A - Double-vector millimeter wave generation system and method based on push-pull modulator - Google Patents
Double-vector millimeter wave generation system and method based on push-pull modulator Download PDFInfo
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- CN112350777A CN112350777A CN202011180631.8A CN202011180631A CN112350777A CN 112350777 A CN112350777 A CN 112350777A CN 202011180631 A CN202011180631 A CN 202011180631A CN 112350777 A CN112350777 A CN 112350777A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0035—Channel filtering, i.e. selecting a frequency channel within a software radio system
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6163—Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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Abstract
The invention belongs to the technical field of optical fiber-wireless communication systems, and provides a double-vector millimeter wave generation system and method based on a push-pull modulator. The invention generates double-vector millimeter wave signals by utilizing a light single side band modulation method based on the push-pull modulator, has simple integral structure, greatly improves the transmission capacity of the system, can transmit signals with different modulation formats of the left side band and the right side band, can reduce the bandwidth requirement of an electronic device at a transmitting end, and effectively reduces the cost of an optical fiber wireless communication system.
Description
Technical Field
The invention belongs to the technical field of Radio-over-Fiber (ROF) communication systems, and particularly relates to a system and a method for generating double-vector millimeter waves based on a push-pull modulator.
Background
With the high-speed increase in communication capacity and access requirements, radio-over-fiber (ROF) applications are becoming increasingly widespread. The radio-optical fiber (ROF) combines the characteristics of low loss, high bandwidth and electromagnetic interference resistance of optical fiber transmission and the characteristics of wide-range coverage of wireless communication, and has the advantages of long distance and wide range. The generation of light vector millimeter waves is an important issue in wireless-fiber systems. Previous vector millimeter wave generation based on external modulators demonstrated millimeter wave signals carrying only one band of wavelengths. Previous schemes proposed a single I/Q modulator based optical Asymmetric Single Sideband (ASSB) modulated 16QAM vector millimeter wave signal generation scheme that produces one unmodulated optical sideband and one modulated optical sideband. But the price of the I/Q modulator is three times that of the intensity modulator, which is a high cost solution. There are also proposals to generate a vector signal at three times the frequency using a costly dual polarization integrated phase shift keying (DPQPSK) modulator. Therefore, if we can replace the IQ modulator with an intensity modulator, the cost will be reduced to a large extent.
In a radio-over-fiber (ROF) system, independent sideband signals can carry greater communication capacity at the same bandwidth. However, the left and right sidebands have a problem of mutual crosstalk. Therefore, when the independent sideband is used for generating the dual-frequency millimeter wave, a scheme for reducing crosstalk needs to be further researched, the problem is well solved by using an MIMO algorithm, and the generated dual-frequency vector millimeter wave has the characteristic of good stability and has huge potential in a future access network system.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a system and a method for generating dual-vector millimeter waves based on a push-pull modulator.
The invention provides a generating system of double-vector millimeter waves based on a push-pull modulator, which is characterized by comprising the following components: the signal generating chip is used for generating dual-frequency independent sideband signals; a digital-to-analog converter for converting the independent sideband signal to an analog signal, the analog signal comprising an imaginary signal and a real signal; a laser for generating laser light; the push-pull modulator is used for modulating the imaginary part signal and the real part signal to laser to obtain a double-sideband optical signal; the filter is used for separating the double-sideband optical signal into a first path of single-sideband optical signal and a second path of single-sideband optical signal; the first photoelectric detector is used for carrying out beat frequency on a local oscillator light source in the first single sideband optical signal and a right sideband signal to generate a first vector millimeter wave signal; and the second photoelectric detector is used for carrying out beat frequency on the local oscillator light source in the second path of single-side band optical signal and the left side band signal to generate a second vector millimeter wave signal.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can further have the following characteristics that: the oscilloscope is used for receiving the first vector millimeter wave signal and the second vector millimeter wave signal, and performing linear and nonlinear compensation on the first vector millimeter wave signal and the second vector millimeter wave signal by using an MIMO algorithm to obtain two paths of recovered baseband signals.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can also have the following characteristics: wherein the independent sideband signal has an up frequency signal and a down frequency signal.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can also have the following characteristics: the center frequencies of the upper frequency signal and the lower frequency signal are equal or unequal.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can also have the following characteristics: the push-pull modulator has two arms, and the radio frequency driving signals of the two arms have a phase difference of 90 degrees.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can also have the following characteristics: the push-pull modulator and the filter are connected through a single-mode optical fiber.
In the generating system of the double-vector millimeter wave based on the push-pull modulator provided by the invention, the generating system can also have the following characteristics: wherein the filter is an optical interleaver.
The invention also provides a generating method of double-vector millimeter waves based on the push-pull modulator, which is characterized by comprising the following steps: generating a dual-frequency independent sideband signal using a signal generating chip; converting the independent sideband signal to an analog signal using a digital-to-analog converter, the analog signal comprising an imaginary signal and a real signal; generating laser light using a laser; modulating the imaginary part signal and the real part signal onto laser by using a push-pull modulator to obtain a double-sideband optical signal; separating the double-sideband optical signal into a first path of single-sideband optical signal and a second path of single-sideband optical signal by using a filter; performing beat frequency on a local oscillator light source in the first single-side band optical signal and a right side band signal by using a first photoelectric detector to generate a first vector millimeter wave signal; and performing beat frequency on a local oscillation light source in the second path of single-side-band optical signal and the left-side-band signal by using a second photoelectric detector to generate a second vector millimeter wave signal.
In the method for generating dual-vector millimeter waves based on a push-pull modulator provided by the invention, the method can also have the following characteristics: the method comprises the steps of receiving a first vector millimeter wave signal and a second vector millimeter wave signal by using an oscilloscope, and performing linear and nonlinear compensation on the first vector millimeter wave signal and the second vector millimeter wave signal by using an MIMO algorithm to obtain two paths of recovered baseband signals.
Action and Effect of the invention
According to the generation and method of the double-vector millimeter wave based on the push-pull modulator, the signal generation chip is used for carrying out up-conversion (right) and down-conversion (left) on a baseband signal to generate a double-frequency independent sideband signal, then the signal enters a digital-to-analog converter (DAC) to generate an analog signal, the laser generates continuous wave laser, the analog signal is modulated on the laser through the push-pull modulator and is transmitted to the optical interleaver through an optical fiber, the optical interleaver converts one path of optical signal into two paths of optical signal, and the two paths of optical signal are subjected to beat frequency through the photoelectric detector to generate a double-vector millimeter wave electric signal.
The invention generates double-vector millimeter wave signals by utilizing a light single side band modulation method based on the push-pull modulator, can be realized by adopting the push-pull modulator, has simple integral structure, greatly improves the transmission capacity of the system, can transmit signals with different modulation formats of the left side band and the right side band, can reduce the bandwidth requirement of an electronic device at a transmitting end, effectively reduces the cost of an optical fiber wireless communication system, and has huge potential in an access network mainly based on an ROF system in the future.
Drawings
Fig. 1 is a schematic structural diagram of a generating system of dual-vector millimeter waves based on a push-pull modulator in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the generation of a dual sideband optical signal in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the generation of two single sideband optical signals in an embodiment of the present invention; and
fig. 4 is a schematic diagram of generating and receiving dual-vector millimeter wave signals according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the following describes a generation system and method of dual-vector millimeter wave based on a push-pull modulator in detail with reference to the embodiments and the accompanying drawings.
< example >
The present embodiment specifically describes a system and a method for generating dual-vector millimeter waves based on a push-pull modulator.
Fig. 1 is a schematic structural diagram of a generating system of dual-vector millimeter waves based on a push-pull modulator in an embodiment of the present invention.
As shown in FIG. 1, the generating system of double-vector millimeter waves based on the push-pull modulator comprises a signal generating chip 1, a digital-to-analog converter (DAC)2, a first electrical amplifier 3-1, a second electrical amplifier 3-2, a laser 4, a push-pull modulator 5, an erbium-doped amplifier (EDFA)6, a single-mode fiber 7, an optical interleaver 8, a first photodetector 9-1, a second photodetector 9-2, a first broadband radio frequency amplifier 10-1, a second broadband radio frequency amplifier 10-2 and an oscilloscope 11.
The signal generating chip 1 is a digital signal generating chip and is connected with the digital-to-analog converter 2 through a wire. In the present embodiment, the signal generating chip 1 is a digital chip.
The output of the digital-to-analog converter 2 is connected to the input points of the first electrical amplifier 3-1 and the second electrical amplifier 3-2 by cables, respectively. The outputs of the first and second electrical amplifiers 3-1 and 3-2 are connected to the electrical input of the push-pull modulator 5 by cables.
The output of the push-pull modulator 5 is connected to the optical input of EDFA6 by an optical cable. The single-mode fiber 7 with good transmission performance connects the EDFA6 with the optical interleaver 8, and the output end of the optical interleaver 8 is connected with the input ends of the first photodetector 9-1 and the second photodetector 9-2 by optical cables. The output end of the first photoelectric detector 9-1 is connected with the input end cable of the first broadband radio frequency amplifier 10-1, the output end of the second photoelectric detector 9-2 is connected with the input end cable of the second broadband radio frequency amplifier 10-2, and the output ends of the first broadband radio frequency amplifier 10-1 and the second broadband radio frequency amplifier 10-2 are connected with the input end of the digital storage oscilloscope 11 through cables.
Fig. 2 is a schematic diagram of the generation of a dual sideband optical signal in an embodiment of the invention. Where fm represents the frequency difference of the sideband signal relative to the center signal.
As shown in FIG. 2, the signal generating chip 1 generates a baseband signal a1(t)、a2And (t) carrying out up/down conversion to obtain the required two frequency bands. The center frequencies of the two frequency bands are equal or unequal. In this embodiment, the center frequencies of the two frequency bands are not equal, a1(t) upconversion of the signal to the desired LSB band, a2(t) the signal is down-converted to the required USB frequency band, and the two frequency bands are added to obtain a double-frequency independent sideband signal A. A digital-to-analog converter (DAC)2 receives the independent sideband signal A generated by the signal generating chip 1 and converts the independent sideband signal into analogA signal. The analog signal comprises two paths of signals with 90-degree phase difference, namely an imaginary part signal (I) and a real part signal (Q). The imaginary signal (I) and the real signal (Q) are simultaneously amplified by a first electrical amplifier 3-1 and a second electrical amplifier 3-2, respectively, of identical construction, for driving a push-pull modulator 5. Laser 4 generates wavelength λ1The continuous wave laser of (1).
The dc bias point of the push-pull modulator 5 is set at the quadrature point, and since the phase difference between the imaginary (I) and real (Q) signals is 90 °, there is a 90 ° phase difference between the rf drive signals of the two arms of the push-pull modulator 5. The push-pull modulator 5 modulates the imaginary signal and the real signal to a wavelength λ1And obtaining a double-sideband optical signal B with different wavelengths on the laser. The double sideband optical signal B is a vector signal.
Fig. 3 is a schematic diagram of two single-sideband optical signals generated in the embodiment of the invention.
As shown in fig. 3, the double sideband optical signal B is amplified in signal power by an erbium doped amplifier 6(EDFA) and transmitted into a 10 km standard single mode fiber 7 (SSMF). The dual sideband optical signal B is split into two optical signals using an optical interleaver 8. From the spectrum diagram, the two paths of optical signals are completely separated to obtain a first path of single-sideband optical signal C and a second path of single-sideband optical signal D.
Fig. 4 is a schematic diagram of generating and receiving dual-vector millimeter wave signals according to an embodiment of the present invention.
As shown in fig. 4, the first photodetector 9-1 performs beat frequency on the local oscillator light source in the first single sideband optical signal C and the right sideband signal to generate a first vector millimeter wave signal; amplified by a first broadband radio frequency amplifier 10-1 and received by a digital storage oscilloscope 11.
Similarly, the second photodetector 9-2 performs beat frequency on the local oscillator light source in the second single-sideband optical signal D and the left sideband signal to generate a second vector millimeter wave signal; amplified by a second broadband radio frequency amplifier 10-2 and received by a digital storage oscilloscope 11.
The digital storage oscilloscope 11 performs linear and nonlinear compensation on the first vector millimeter wave signal and the second vector millimeter wave signal by using an MIMO algorithm to obtain two signalsThe baseband signal of the path recovery, i.e. the original baseband signal a1(t)、a2And (t) recovery is carried out, and crosstalk of left and right side bands is effectively avoided.
In this embodiment, an optical interleaver is used to split the dual-sideband optical signal B into two optical signals, and in other embodiments, another type of filter may be used.
Effects and effects of the embodiments
According to the generation and method of the double-vector millimeter wave based on the push-pull modulator provided by the embodiment, the signal generation chip is used for carrying out up-conversion (right) and down-conversion (left) on a baseband signal to generate a double-frequency independent sideband signal, then the signal enters a digital-to-analog converter (DAC) to generate an analog signal, the laser generates continuous wave laser, the analog signal is modulated on the laser through the push-pull modulator and is transmitted to the optical interleaver through an optical fiber, the optical interleaver converts one path of optical signal into two paths of optical signal, and the two paths of optical signal are subjected to beat frequency by the photoelectric detector to generate a double-vector millimeter wave electric signal. Meanwhile, the MIMO is used at the receiving end, so that the crosstalk of the left and right sidebands is effectively avoided, and the realized dual-vector millimeter waves also greatly improve the communication capacity of the system.
The system generates double-vector millimeter wave signals by utilizing a light single-sideband modulation method based on the push-pull modulator, can be realized by adopting the push-pull modulator, has simple integral structure, greatly improves the transmission capacity of the system, can transmit signals with different modulation formats of a left sideband and a right sideband, can reduce the bandwidth requirement of an electronic device at a transmitting end, effectively reduces the cost of an optical fiber wireless communication system, and has huge potential in an access network mainly based on an ROF system in the future.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (9)
1. A generating system of double-vector millimeter waves based on a push-pull modulator is characterized by comprising:
the signal generating chip is used for generating dual-frequency independent sideband signals;
a digital-to-analog converter for converting the independent sideband signal into an analog signal, the analog signal comprising an imaginary signal and a real signal;
a laser for generating laser light;
the push-pull modulator is used for modulating the imaginary part signal and the real part signal onto the laser to obtain a double-sideband optical signal;
the filter is used for separating the double-sideband optical signal into a first path of single-sideband optical signal and a second path of single-sideband optical signal;
the first photoelectric detector is used for performing beat frequency on a local oscillator light source in the first single sideband optical signal and a right sideband signal to generate a first vector millimeter wave signal; and
and the second photoelectric detector is used for performing beat frequency on a local oscillation light source and a left side band signal in the second path of single-side band optical signal to generate a second vector millimeter wave signal.
2. The push-pull modulator-based dual-vector millimeter wave generation system according to claim 1, further comprising:
an oscilloscope (or an oscilloscope) is used for displaying,
the oscilloscope is used for receiving the first vector millimeter wave signal and the second vector millimeter wave signal, and performing linear and nonlinear compensation on the first vector millimeter wave signal and the second vector millimeter wave signal by using an MIMO algorithm to obtain two paths of recovered baseband signals.
3. The push-pull modulator-based dual-vector millimeter wave generation system of claim 1, wherein:
wherein the independent sideband signal has an up frequency signal and a down frequency signal.
4. The push-pull modulator-based dual-vector millimeter wave generation system of claim 3, wherein:
wherein the center frequencies of the up-frequency signal and the down-frequency signal are equal or different.
5. The push-pull modulator-based dual-vector millimeter wave generation system of claim 1, wherein:
wherein the push-pull modulator has two arms, and the radio frequency driving signals of the two arms have a phase difference of 90 degrees.
6. The push-pull modulator-based dual-vector millimeter wave generation system of claim 1, wherein:
wherein the push-pull modulator and the filter are connected by a single mode fiber.
7. The push-pull modulator-based dual-vector millimeter wave generation system of claim 1, wherein:
wherein the filter is an optical interleaver.
8. A method for generating dual-vector millimeter wave based on push-pull modulator according to any of claims 1-7, characterized by comprising the following steps:
generating a dual-frequency independent sideband signal using a signal generating chip;
converting the independent sideband signal to an analog signal using a digital-to-analog converter, the analog signal comprising an imaginary signal and a real signal;
generating laser light using a laser;
modulating the imaginary part signal and the real part signal onto the laser by using a push-pull modulator to obtain a double-sideband optical signal;
separating the double-sideband optical signal into a first path of single-sideband optical signal and a second path of single-sideband optical signal by using a filter;
performing beat frequency on a local oscillator light source in the first single sideband optical signal and a right sideband signal by using a first photoelectric detector to generate a first vector millimeter wave signal;
and performing beat frequency on the local oscillator light source and the left side band signal in the second path of single-side band optical signal by using a second photoelectric detector to generate a second vector millimeter wave signal.
9. The method for generating dual-vector millimeter waves based on a push-pull modulator according to claim 8, wherein:
and receiving the first vector millimeter wave signal and the second vector millimeter wave signal by using an oscilloscope, and performing linear and nonlinear compensation on the first vector millimeter wave signal and the second vector millimeter wave signal by using an MIMO algorithm to obtain two paths of recovered baseband signals.
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