CN111614403B - M of intensity modulator based on polarization multiplexing 2 Method and system for generating QAM RF signal - Google Patents
M of intensity modulator based on polarization multiplexing 2 Method and system for generating QAM RF signal Download PDFInfo
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- CN111614403B CN111614403B CN202010343091.4A CN202010343091A CN111614403B CN 111614403 B CN111614403 B CN 111614403B CN 202010343091 A CN202010343091 A CN 202010343091A CN 111614403 B CN111614403 B CN 111614403B
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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
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the technical field of optical fiber-wireless communication systems, and provides an M-type intensity modulator based on polarization multiplexing 2 -QAM RF signal generation method and system. Generating laser by using a laser, generating two paths of sine wave radio frequency signals by using a radio frequency source, generating phase offset by using a phase shifter, generating a baseband signal in a digital domain by using a digital source, modulating the baseband signal onto the radio frequency signal by using a mixer, driving a polarization multiplexing intensity modulator by using a mixed analog signal, modulating the laser to generate a double-sideband optical signal, beating the generated double-sideband optical signal by using a photoelectric detector to generate M 2 -QAM signals. The invention has simple structure, low complexity, low cost and high modulation efficiency, can generate double-rate signals, has small signal loss and can transmit long distance in the dispersion displacement optical fiber. The invention can reduce the bandwidth requirement of the electronic device at the transmitting end, thereby effectively reducing the system cost.
Description
Technical Field
The invention belongs to the technical field of optical-Radio-over-Fiber (ROF) communication systems, and particularly relates to an M of an intensity modulator based on polarization multiplexing 2 -QAM RF signal generation method and system.
Background
With the advent of new technologies such as artificial intelligence and the internet of things, and the development of smart phones, the internet has developed to a new stage. Multimedia applications based on mobile terminals are emerging, which are mainly characterized by the requirement of high bandwidth and low latency. Therefore, wireless communication should also be moving toward greater system capacity and lower latency. Now, the fifth generation wireless transmission technology (5G) has been developed to the millimeter wave band to utilize more spectrum resources. As is well known, optical fiber-Radio (ROF) technology has the advantages of low cost, low loss and large bandwidth, so ROF has become a promising next-generation millimeter wave radio access technology to be widely studied.
How to generate adaptive photon-assisted two-dimensional quadrature amplitude modulation (M) in ROF systems 2 QAM) signals are a problem of great research value. Due to M 2 QAM modulation can realize signal loading in two dimensions of in-phase and quadrature, thus improving modulation signalThe spectral efficiency of the numbers, thereby achieving a doubled transmission bit rate. To use purely electronic methods, we can use digital-to-analog converters (DACs) or in-phase/quadrature (I/Q) mixers to generate M 2 -an electrical radio frequency signal of QAM. But at high frequencies the bandwidth of the DAC is difficult to meet and very expensive. For I/Q mixers, high frequency bandwidth is also difficult to achieve. There are some synthesis methods for M in millimeter wave ROF system 2 -a method of QAM signals. For example, a multi-antenna ROF system with 2 x 1MIMO wireless that sets an optical delay line in the optical domain to adjust the phase and maintain signal orthogonality, thereby combining two independent on-off keying (OOK) signals into a 4QAM signal with dual bit rates at the receiver. However, the current methods all have the disadvantages of complex structure and instability.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an M-type intensity modulator based on polarization multiplexing 2 Method and system for generating QAM RF signals, generating M based on photon-assisted method of polarization multiplexing intensity modulator 2 The QAM RF (two-dimensional quadrature amplitude modulation radio frequency) signal has a simple structure and can greatly improve the modulation efficiency.
The invention provides an M of an intensity modulator based on polarization multiplexing 2 -a QAM RF signal generation method having the feature of comprising the steps of: generating laser light using a laser; generating two paths of single-frequency radio frequency signals by using a radio frequency source; using a phase shifter to enable one of the single-frequency radio frequency signals to generate phase shift to realize quadrature modulation; generating a baseband signal in the digital domain using a digital source; mixing the baseband signal with a single-frequency radio frequency signal by using a mixer to obtain a radio frequency signal; using radio frequency signals to drive a polarization multiplexing intensity modulator to modulate laser so as to generate a double-sideband optical signal; beat frequency of double-sideband optical signal by using photodetector to generate M 2 -QAM signals.
M of intensity modulator based on polarization multiplexing provided in the invention 2 The QAM RF signal generation method may further have the feature of: wherein, single frequency radio frequency signalIs a sine wave radio frequency signal.
M of intensity modulator based on polarization multiplexing provided in the invention 2 The QAM RF signal generation method may further have the feature of: wherein the laser is a DFB laser or an external cavity laser.
M of intensity modulator based on polarization multiplexing provided in the invention 2 The QAM RF signal generation method may further have the feature of: wherein the phase offset is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
M of intensity modulator based on polarization multiplexing provided in the invention 2 The QAM RF signal generation method may further have the feature of: wherein M is 2 The phase shift of the QAM signal is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
The invention also provides an M of the intensity modulator based on polarization multiplexing 2 -a QAM RF signal generating system having the features of: a laser for generating a continuous wave laser light of an arbitrary wavelength; a radio frequency source for generating a single frequency radio frequency signal a 1 (t) and a single frequency radio frequency signal a 2 (t); phase shifter for adjusting single frequency radio frequency signal a 2 (t) shifting the phase of the signal by 90 degrees or an integer multiple of 2 pi plus 90 degrees to realize quadrature modulation, thereby obtaining an adjusted single-frequency radio frequency signal a 2 (t); a first data source for generating a first baseband signal in the digital domain; a second data source for generating a second baseband signal in the digital domain; a first mixer for mixing the single-frequency radio frequency signal a 1 (t) mixing with the first baseband signal to obtain a first radio frequency signal; a second mixer for mixing the adjusted single-frequency radio frequency signal a 2 (t) mixing with a second baseband signal to obtain a second radio frequency signal; the polarization multiplexing intensity modulator is used for modulating the first radio frequency signal and the second radio frequency signal onto laser to obtain a double-sideband optical signal with two polarization states; the photoelectric detector is used for beating the double-sideband optical signal to obtain a two-dimensional quadrature amplitude modulation radio frequency (M 2 -QAM RF) signal.
M of intensity modulator based on polarization multiplexing provided in the invention 2 QAM RF signalThe number generation system may further have the feature that: wherein the laser is a DFB laser or an external cavity laser.
M of intensity modulator based on polarization multiplexing provided in the invention 2 In a QAM RF signal generating system, it may also be characterized by: wherein the phase offset is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
M of intensity modulator based on polarization multiplexing provided in the invention 2 In a QAM RF signal generating system, it may also be characterized by: wherein M is 2 The phase shift of the QAM signal is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
Effects and effects of the invention
According to the invention, a two-dimensional quadrature amplitude modulation (M 2 QAM) Radio Frequency (RF) signal generating method and system, using a laser to generate laser, using a radio frequency source to generate two paths of sine wave radio frequency signals, using a phase shifter to enable one path to generate phase shift to realize quadrature modulation, using a digital source to generate a baseband signal in a digital domain, using a mixer to mix the baseband signal with the radio frequency signal to obtain the radio frequency signal, using the radio frequency signal to drive a polarization multiplexing intensity modulator to modulate the laser to generate a double-sideband optical signal, using a photoelectric detector to beat the double-sideband optical signal to generate M 2 -QAM signals. The M is 2 Both the quadrature and in-phase dimensions of the QAM signal modulate the signal, with an information rate twice the baud rate, with small losses in the fiber relative to wireless transmission, and can be transmitted over longer distances in dispersion shifted fibers.
The system only needs one Remote Antenna Unit (RAU), namely a radio frequency source, as a transmitting end, and is not a complex multiple-input multiple-output (MIMO) structure; and the core module thereof only depends on one polarization multiplexing intensity modulator to realize M 2 The generation of QAM RF signals greatly improves the modulation efficiency in a more cost-effective and stable manner. The maintenance of signal orthogonality depends on the phase shifter in the electrical domain and not on the ODL, so it can achieve a more stable effect.
The invention utilizes M 2 -QAMThe RF signal has the characteristics of high modulation efficiency, convenience and flexibility, adopts a method of loading two paths of signals of quadrature and in-phase into two optical polarization states which are not in crosstalk with each other, uses a phase shifter to realize quadrature modulation of the phase, improves the modulation efficiency, uses a polarization multiplexing intensity modulator to realize the synthesis of the two paths of signals, simplifies the structure of a transmitting end of the system, does not need a broadband mixer, avoids the use of a DAC or an I/Q mixer with complex structure, reduces the bandwidth requirement of an electronic device of the transmitting end, reduces the system cost, and exerts great advantages on an access network mainly comprising an ROF system in the future, thereby effectively reducing the system cost.
Drawings
Fig. 1 is a schematic diagram of a two-dimensional quadrature amplitude modulation radio frequency signal generation system in an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement of the purposes and the effects of the present invention easy to understand, the present invention is a two-dimensional quadrature amplitude modulation (M) 2 -QAM) Radio Frequency (RF) signal generation methods and systems are specifically described.
< example >
The present embodiment is directed to a two-dimensional quadrature amplitude modulation (M 2 -QAM) Radio Frequency (RF) signal generation methods and systems are specifically described.
FIG. 1 is a two-dimensional quadrature amplitude modulation (M) in an embodiment of the invention 2 -QAM) a schematic of the structure of a Radio Frequency (RF) signal generating system.
As shown in fig. 1, the two-dimensional quadrature amplitude modulation radio frequency signal generation system includes: a radio frequency source 1, a laser 2, a first data source 3, a second data source 33, a phase shifter 4, a first mixer 5, a second mixer 55, a polarization multiplexing intensity modulator 6 and a photodetector 7.
The output of the laser 2 is optically connected to the optical input of the polarization multiplexing intensity modulator 6.
The output of the radio frequency source 1 is connected by a cable to the input of the phase shifter 4 and the output of the phase shifter 4 is connected by a cable to the input of the second mixer 55. At the same time, the output of the rf source 1 is also connected to the input of the first mixer 5 by a cable.
The output of the first data source 3 is connected to the input of the first mixer 5 by a cable. The output of the second data source 33 is connected by a cable to the input of the second mixer 55.
The output of the first mixer 5 is cabled with the electrical input of the X-polarization state in the polarization multiplexing intensity modulator 6 and the output of the second mixer 55 is cabled with the electrical input of the Y-polarization state in the polarization multiplexing intensity modulator 6.
The output end of the polarization multiplexing intensity modulator 6 is connected with the input end of the photoelectric detector 7 by a cable.
The radio frequency source 1 generates two paths of single frequency radio frequency signals for driving the polarization multiplexing intensity modulator 6.
The two paths of single-frequency radio frequency signals are single-frequency radio frequency signals a 1 (t) and a single frequency radio frequency signal a 2 (t) are sine wave radio frequency signals.
The phase shifter 4 adjusts one of the single-frequency radio frequency signals a 2 The phase of (t) is shifted to realize quadrature modulation. The phase shifter 4 adjusts a 2 (t) phase-shifting by 90 degrees or integer multiple of 2 pi plus 90 degrees to obtain an adjusted single-frequency RF signal a 2 (t). Single frequency radio frequency signal a passing through phase shifter 4 2 (t) still maintain orthogonality.
The laser 2 generates continuous wave laser light of a prescribed wavelength for optical fiber communication. The laser may be a DFB laser, external cavity laser, or other laser. In the present embodiment, the laser 2 is a DFB laser, and generates continuous wave laser light of wavelength λ.
The first data source 3 generates a first baseband signal in the digital domain and the second data source 33 generates a second baseband signal in the digital domain.
The first mixer 5 mixes the single-frequency RF signal a generated by the RF source 1 1 (t) mixing with a first baseband signal generated by the first data source 3 to obtain a first radio frequency signal, and implementing up-conversion of the electrical signal.
The second mixer 55 adjusts the single-frequency RF signal a after the phase shifter 4 2 (t) and a second data source33 to obtain a second radio frequency signal, and to realize the up-conversion of the electrical signal.
The first radio frequency signal and the second radio frequency signal are polarized signals with orthogonal polarization, and do not cross each other.
The polarization multiplexing intensity modulator 6 modulates the first radio frequency signal generated by the first mixer 5 and the second radio frequency signal generated by the second mixer 55 onto the wavelength of the continuous wave laser with the wavelength lambda generated by the laser source 2 under the driving of the first radio frequency signal and the second radio frequency signal, so as to realize the optical double-sideband modulation of two polarization states and obtain a double-sideband optical signal with two polarization states.
The photodetector 7 beats the double-sideband optical signal to obtain a two-dimensional quadrature amplitude modulation radio frequency (M) 2 -QAM RF) signal. The phase of the signal is shifted by 90 degrees or an integer multiple of 2 pi plus 90 degrees.
Because the polarization multiplexing intensity modulator 6 is driven by the first and second radio frequency signals which are polarized in quadrature and are 90 degrees out of phase, and the polarization multiplexing intensity modulator 6 modulates the first and second radio frequency signals onto the wavelength of the continuous wave laser generated by the laser source 2, the two-dimensional quadrature amplitude modulation radio frequency (M) generated by beat frequency of the photodetector 7 2 QAM RF) signals are modulated in both quadrature and in-phase dimensions, the information rate being twice the baud rate. And because of adopting two-dimensional modulation, the modulation efficiency is improved.
Effects and effects of the examples
According to the two-dimensional quadrature amplitude modulation (M 2 -QAM) Radio Frequency (RF) signal generating method and system, using a laser to generate laser, using a radio frequency source to generate two paths of sine wave radio frequency signals, using a phase shifter to generate one path of phase shift, using a digital source to generate a baseband signal in the digital domain, using a mixer to modulate the baseband signal onto the radio frequency signal, using the mixed radio frequency signal to drive a polarization multiplexing intensity modulator to modulate the laser to generate a double-sideband optical signal, using a photodetector to beat the generated double-sideband optical signal to generate M 2 -QAM signals. The M is 2 Both the quadrature and in-phase dimensions of the QAM signal modulate the signal, with an information rate twice the baud rate, with less loss in the fiber relative to wireless transmission, and can be transmitted over longer distances in dispersion shifted fibers.
The architecture requires only one Remote Antenna Unit (RAU), i.e. a radio frequency source, as the transmitting end, instead of a complex Multiple Input Multiple Output (MIMO) structure. And the core module thereof only depends on one polarization multiplexing intensity modulator to realize M 2 The generation of QAM RF signals greatly improves the modulation efficiency in a more cost-effective and stable manner. The maintenance of signal orthogonality depends on the phase shifter in the electrical domain and not on the ODL, so it can achieve a more stable effect.
The invention utilizes M 2 The invention can realize quadrature modulation of phase by using a phase shifter, improve modulation efficiency, simplify system transmitting end structure by using a polarization multiplexing intensity modulator to realize synthesis of two paths of signals, avoid using DAC or I/Q mixer with complex structure, reduce bandwidth requirement of transmitting end electronic device, and reduce system cost.
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. M of intensity modulator based on polarization multiplexing 2 -QAM RF signal generation method, characterized by the steps of:
generating laser light using a laser;
generating two paths of single-frequency radio frequency signals by using a radio frequency source;
using a phase shifter to enable one path of single-frequency radio frequency signals to generate phase offset to realize quadrature modulation, and obtaining adjusted single-frequency radio frequency signals;
generating a first baseband signal in the digital domain using a first data source;
generating a second baseband signal in the digital domain using a second data source;
mixing the first baseband signal with the single-frequency radio frequency signal by using a first mixer to obtain a first radio frequency signal;
mixing the second baseband signal with the adjusted single-frequency radio frequency signal by using a second mixer to obtain a second radio frequency signal, wherein the first radio frequency signal and the second radio frequency signal are polarized signals with orthogonal polarization;
driving the polarization multiplexing intensity modulator by using the first radio frequency signal and the second radio frequency signal, and modulating the first radio frequency signal and the second radio frequency signal onto the laser to generate a double-sideband optical signal with two polarization states;
beat frequency of the double sideband optical signal using a photodetector to produce M 2 -QAM signals.
2. Polarization multiplexing-based intensity modulator M according to claim 1 2 -QAM RF signal generation method characterized by:
wherein the single-frequency radio frequency signal is a sine wave radio frequency signal.
3. Polarization multiplexing-based intensity modulator M according to claim 1 2 -QAM RF signal generation method characterized by:
wherein the laser is a DFB laser or an external cavity laser.
4. Polarization multiplexing-based intensity modulator M according to claim 1 2 -QAM RF signal generation method characterized by:
wherein the phase offset is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
5. Polarization multiplexing-based intensity modulator M of claim 4 2 -QAM RF signal generatorThe method is characterized in that:
wherein the M 2 The phase shift of the QAM signal is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
6. M of intensity modulator based on polarization multiplexing 2 -a QAM RF signal generating system, characterized by comprising:
a laser for generating a continuous wave laser light of an arbitrary wavelength;
a radio frequency source for generating a single frequency radio frequency signal a 1 (t) and a single frequency radio frequency signal a 2 (t)；
A phase shifter for adjusting the single frequency radio frequency signal a therein 2 (t) shifting the phase of the signal by 90 degrees or an integer multiple of 2 pi plus 90 degrees to realize quadrature modulation, thereby obtaining an adjusted single-frequency radio frequency signal a 2 (t)；
A first data source for generating a first baseband signal in the digital domain;
a second data source for generating a second baseband signal in the digital domain;
a first mixer for mixing the single-frequency radio frequency signal a 1 (t) mixing with the first baseband signal to obtain a first radio frequency signal;
a second mixer for mixing the adjusted single-frequency radio frequency signal a 2 (t) mixing with the second baseband signal to obtain a second radio frequency signal, wherein the first radio frequency signal and the second radio frequency signal are polarized signals with orthogonal polarization;
the polarization multiplexing intensity modulator is used for modulating the first radio frequency signal and the second radio frequency signal onto the laser to obtain a double-sideband optical signal with two polarization states;
the photoelectric detector is used for beating the double-sideband optical signal to obtain a two-dimensional quadrature amplitude modulation radio frequency (M) 2 -QAM RF) signal.
7. Polarization multiplexing-based intensity modulator M of claim 6 2 -a QAM RF signal generating system characterized by:
wherein the laser is a DFB laser or an external cavity laser.
8. Polarization multiplexing-based intensity modulator M of claim 6 2 -a QAM RF signal generating system characterized by:
wherein the phase offset is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
9. Polarization multiplexing-based intensity modulator M of claim 6 2 -a QAM RF signal generating system characterized by:
wherein the M 2 The phase shift of the QAM signal is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
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