CN111614403A - M of polarization multiplexing based intensity modulator2-QAM RF signal generation method and system - Google Patents
M of polarization multiplexing based intensity modulator2-QAM RF signal generation method and system Download PDFInfo
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- CN111614403A CN111614403A CN202010343091.4A CN202010343091A CN111614403A CN 111614403 A CN111614403 A CN 111614403A CN 202010343091 A CN202010343091 A CN 202010343091A CN 111614403 A CN111614403 A CN 111614403A
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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 intensity modulator M based on polarization multiplexing2-QAM RF signal generation method and system. The method comprises the steps of generating laser by using a laser, generating two paths of sine wave radio frequency signals by using a radio frequency source, generating phase shift on one path by using a phase shifter, generating a baseband signal of 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 an analog signal after frequency mixing, modulating the laser to generate a double-sideband optical signal, performing beat frequency on the generated double-sideband optical signal by using a photoelectric detector to generate M2-a QAM signal. The invention has simple structure, low complexity, low cost and high modulation efficiency, and can generate double-rate signalThe signal loss is small, and the signal can be transmitted in the dispersion displacement optical fiber for a longer distance. 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 Radio-over-Fiber (ROF) communication systems, and particularly relates to an intensity modulator M based on polarization multiplexing2-QAM RF signal generation method and system.
Background
With the emergence of new technologies such as artificial intelligence and the internet of things and the development of smart phones, the internet develops to a new stage. Multimedia applications based on mobile terminals are emerging, which are mainly characterized by high bandwidth and low latency requirements. Therefore, wireless communications should also be developed towards greater system capacity and lower latency. Nowadays, a fifth generation wireless transmission technology (5G) has been developed towards the millimeter wave frequency band to utilize more spectrum resources. As it is well known that a fiber-Radio (ROF) technology has advantages of low cost, low loss and large bandwidth, ROF has become a promising next-generation millimeter wave wireless access technology to be widely researched.
How to generate adaptive photon-assisted two-dimensional quadrature amplitude modulation (M) in ROF systems2-QAM) signals is a problem of great research interest. Due to M2QAM modulation allows signal loading in both in-phase and quadrature dimensions, and thus increases the spectral efficiency of the modulated signal, thereby doubling the transmission bit rate. To use a purely electronic approach, we can use a digital-to-analog converter (DAC) or an in-phase/quadrature (I/Q) mixer to generate M2-an electrical radio frequency signal of QAM. But at high frequencies the bandwidth of the DAC is difficult to meet and very expensive. High frequency bandwidth is also difficult to achieve for I/Q mixers. At present, some synthesis M in millimeter wave ROF system2For example, a multi-antenna ROF system with 2 × 1MIMO wireless, which sets an optical delay line in the optical domain to adjust the phase and maintain the orthogonality of the signals, thereby combining two independent on-off keying (OOK) signals at the receiver into a 4QAM signal with a dual bit rate.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an intensity modulator M based on polarization multiplexing2Method and system for generating QAM RF signal based on photon assisted method of polarization multiplexed intensity modulator2The QAM RF (two-dimensional quadrature amplitude modulation radio frequency) signal has a simple structure and can greatly improve the modulation efficiency.
The inventionM of intensity modulator based on polarization multiplexing2-a QAM RF signal generation method, characterized by 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 single-frequency radio-frequency signal to generate phase shift to realize quadrature modulation; generating a baseband signal in a 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 signal to drive the polarization multiplexing intensity modulator to modulate the laser and generate a double-sideband optical signal; using a photodetector to beat the dual sideband optical signal to generate M2-a QAM signal.
In the intensity modulator M based on polarization multiplexing provided by the invention2The QAM RF signal generating method may further have the following features: the single-frequency radio-frequency signal is a sine wave radio-frequency signal.
In the intensity modulator M based on polarization multiplexing provided by the invention2The QAM RF signal generating method may further have the following features: wherein, the laser is a DFB laser or an external cavity laser.
In the intensity modulator M based on polarization multiplexing provided by the invention2The QAM RF signal generating method may further have the following features: wherein the phase shift is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
In the intensity modulator M based on polarization multiplexing provided by the invention2The QAM RF signal generating method may further have the following features: wherein M is2-the phase shift of the QAM signal is 90 degrees or an integer multiple of 2 π plus 90 degrees.
The invention also provides an intensity modulator M based on polarization multiplexing2-a QAM RF signal generating system having the characteristics comprising: a laser for generating continuous wave laser light of an arbitrary wavelength; a radio frequency source for generating a single frequency radio frequency signal a1(t) and a single frequency radio frequency signal a2(t); a phase shifter for adjusting the single-frequency RF signal a therein2(t) is shifted in phase by 90 degrees or by an integer multiple of 2 pi plus 90 degrees to achieve orthogonalityModulating to obtain an adjusted single-frequency radio frequency signal a2(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 a single-frequency RF signal a1(t) mixing with the first baseband signal to obtain a first radio frequency signal; a second mixer for mixing the adjusted single-frequency RF signal a2(t) mixing with the 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 to laser to obtain a double-sideband optical signal with two polarization states; a photoelectric detector for performing beat frequency on the dual-sideband optical signal to obtain two-dimensional quadrature amplitude modulation radio frequency (M)2-QAM RF) signal.
In the intensity modulator M based on polarization multiplexing provided by the invention2-a QAM RF signal generating system, further comprising: wherein, the laser is a DFB laser or an external cavity laser.
In the intensity modulator M based on polarization multiplexing provided by the invention2-a QAM RF signal generating system, further comprising: wherein the phase shift is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
In the intensity modulator M based on polarization multiplexing provided by the invention2-a QAM RF signal generating system, further comprising: wherein M is2-the phase shift of the QAM signal is 90 degrees or an integer multiple of 2 π plus 90 degrees.
Action and Effect of the invention
Two-dimensional quadrature amplitude modulation (M) provided in accordance with the present invention2-QAM) Radio Frequency (RF) signal generating method and system, using a laser to generate laser, using a radio frequency source to generate two sine wave radio frequency signals, using a phase shifter to make one of the two sine wave radio frequency signals generate phase shift to realize quadrature modulation, using a digital source to generate a baseband signal of a digital domain, using a mixer to mix the baseband signal with the radio frequency signal to obtain a radio frequency signal, using the radio frequency signal to drive a polarization multiplexing intensity modulator to modulate the laser to generate a dual-sideband optical signal, and using a photodetector to perform a double-sideband optical signalThe double sideband optical signal is beaten to generate M2-a QAM signal. The M2The quadrature and in-phase dimensions of a QAM signal modulate the signal, the information rate is twice the baud rate, there is less loss in the fiber relative to wireless transmission, and longer distances can be transmitted in dispersion shifted fiber.
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 of the polarization multiplexing intensity modulator only depends on one polarization multiplexing intensity modulator to realize M2Generation 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 M2The QAM RF signal has the characteristics of high modulation efficiency, convenience and flexibility, a method of loading orthogonal and in-phase signals to two optical polarization states which are not mutually interfered is adopted, the phase quadrature modulation is realized by using a phase shifter, the modulation efficiency is improved, the synthesis of the two signals is realized by using a polarization multiplexing intensity modulator, the structure of a transmitting end of the system is simplified, a broadband mixer is not needed, the use of a DAC or an I/Q mixer with a complex structure is avoided, the bandwidth requirement of an electronic device at the transmitting end is reduced, and the system cost is reduced.
Drawings
Fig. 1 is a schematic structural 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, creation features, achievement objects and effects of the invention easy to understand, a two-dimensional quadrature amplitude modulation (M) of the invention is described below with reference to the accompanying drawings2-QAM) Radio Frequency (RF) signal generation methods and systems are described.
< example >
The embodiment pairTwo-dimensional quadrature amplitude modulation (M)2-QAM) Radio Frequency (RF) signal generation methods and systems are described.
FIG. 1 is a two-dimensional quadrature amplitude modulation (M) in an embodiment of the invention2-QAM) Radio Frequency (RF) signal generating system.
As shown in fig. 1, the two-dimensional quadrature amplitude modulation radio frequency signal generating 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 end of the laser 2 is connected with the optical input end of the polarization multiplexing intensity modulator 6 by an optical fiber.
The output of the radio frequency source 1 is connected to the input of the phase shifter 4 by a cable, and the output of the phase shifter 4 is connected to the input of the second mixer 55 by a cable. Meanwhile, the output terminal of the rf source 1 is also connected to the input terminal 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 to the input of a second mixer 55 by cable.
The output terminal of the first mixer 5 is connected to the electrical input terminal of the X polarization state in the polarization multiplexing intensity modulator 6 by a cable, and the output terminal of the second mixer 55 is connected to the electrical input terminal of the Y polarization state in the polarization multiplexing intensity modulator 6 by a cable.
The output end of the polarization multiplexing intensity modulator 6 is connected with the input end of the photoelectric detector 7 by an optical cable.
The radio frequency source 1 generates two 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 a1(t) and a single frequency radio frequency signal a2And (t) are all sine wave radio frequency signals.
The phase shifter 4 adjusts one single-frequency radio frequency signal a2The phase of (t) shifts it to achieve quadrature modulation. Phase shifter 4 adjusts a2(t) the phase deviation is 90 degrees or the integral multiple of 2 pi is added with 90 degrees to obtain the adjusted single-frequency radio-frequency signal a2(t) of (d). Single frequency radio frequency signal a passing through phase shifter 42(t) still maintaining orthogonality.
The laser 2 generates continuous wave laser light of a specified wavelength for fiber optic 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 a 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 11(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 adjusted single-frequency RF signal a through the phase shifter 42(t) is mixed with a second baseband signal generated by the second data source 33 to obtain a second radio frequency signal, thereby realizing up-conversion of the electrical signal.
The first radio frequency signal and the second radio frequency signal are polarization signals with orthogonal polarization, and are not mutually crosstalked.
Under the driving of the first radio frequency signal and the second radio frequency signal, 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 λ generated by the laser source 2, 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 photoelectric detector 7 carries out beat frequency on 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 radio frequency signal and the second radio frequency signal which are orthogonal in polarization and have 90-degree phase difference, and the polarization multiplexing intensity modulator 6 modulates the first radio frequency signal and the second radio frequency signal onto the wavelength of the continuous wave laser generated by the laser source 2, the two-dimensional orthogonal amplitude modulation radio frequency (M) generated by beat frequency of the photoelectric detector 72-QAM RF) signal modulates the signal in both quadrature and in-phase dimensions with an information rate twice the baud rate. And because two-dimensional modulation is adopted, the modulation efficiency is improved.
Effects and effects of the embodiments
Two-dimensional quadrature amplitude modulation (M) provided according to the present embodiment2-QAM) Radio Frequency (RF) signal generating method and system, using a laser to generate laser, using a RF source to generate two sine wave RF signals, using a phase shifter to shift the phase of one of the sine wave RF signals, using a digital source to generate a baseband signal in a digital domain, using a mixer to modulate the baseband signal onto the RF signal, using the RF signal after mixing to drive a polarization multiplexing intensity modulator to modulate the laser to generate a dual-sideband optical signal, using a photodetector to beat the generated dual-sideband optical signal to generate M2-a QAM signal. The M2The quadrature and in-phase dimensions of QAM signals modulate the signal, the information rate is twice the baud rate, there is less loss in the fiber relative to wireless transmission, and longer distances can be transmitted in dispersion shifted fiber.
This architecture requires only one Remote Antenna Unit (RAU), i.e., radio frequency source, as the transmitting end, rather than a complex multiple-input multiple-output (MIMO) structure. And the core module of the polarization multiplexing intensity modulator only depends on one polarization multiplexing intensity modulator to realize M2Generation 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 M2The QAM RF signal has the characteristics of high modulation efficiency, convenience and flexibility, the method of loading two paths of orthogonal and in-phase signals to two optical polarization states which are not mutually interfered is adopted, the phase quadrature modulation is realized by using a phase shifter, the modulation efficiency is improved, the synthesis of the two paths of signals is realized by using a polarization multiplexing intensity modulator, the structure of a transmitting end of a system is simplified, a broadband mixer is not needed, the use of a DAC or an I/Q mixer with a complex structure is avoided, and the bandwidth requirement of an electronic device at the transmitting end is reduced,the invention reduces the system cost, and the invention can play a great advantage in the future access network mainly based on the ROF system, thereby effectively reducing the 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. Intensity modulator M based on polarization multiplexing2-QAM RF signal generation method, characterized in that it comprises the following steps:
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 the single-frequency radio-frequency signals to generate phase shift to realize quadrature modulation;
generating a baseband signal in a digital domain using a digital source;
mixing the baseband signal and the single-frequency radio-frequency signal by using a mixer to obtain a radio-frequency signal;
driving the polarization multiplexing intensity modulator by using the radio frequency signal to modulate the laser and generate a double-sideband optical signal;
beat-frequency the double-sideband optical signal using a photodetector to produce M2-a QAM signal.
2. M of polarization multiplexing based intensity modulator according to claim 12-a QAM RF signal generating method, characterized by:
the single-frequency radio-frequency signal is a sine wave radio-frequency signal.
3. M of polarization multiplexing based intensity modulator according to claim 12-a QAM RF signal generating method, characterized by:
wherein, the laser is a DFB laser or an external cavity laser.
4. M of polarization multiplexing based intensity modulator according to claim 12-QAM An RF signal generating method, characterized by:
wherein the phase shift is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
5. M of polarization multiplexing based intensity modulator according to claim 42-a QAM RF signal generating method, characterized by:
wherein, M is2-the phase shift of the QAM signal is 90 degrees or an integer multiple of 2 π plus 90 degrees.
6. Intensity modulator M based on polarization multiplexing2-a QAM RF signal generating system, characterized in that it comprises:
a laser for generating continuous wave laser light of an arbitrary wavelength;
a radio frequency source for generating a single frequency radio frequency signal a1(t) and a single frequency radio frequency signal a2(t)；
A phase shifter for adjusting the single-frequency RF signal a2The phase of (t) shifts 90 degrees or integral multiple of 2 pi plus 90 degrees to realize quadrature modulation, and the adjusted single-frequency radio-frequency signal a is obtained2(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 a1(t) mixing with said first baseband signal to obtain a first radio frequency signal;
a second mixer for mixing the adjusted single-frequency RF signal a2(t) mixing with the 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 to the laser to obtain a double-sideband optical signal with two polarization states;
a photoelectric detector for performing beat frequency on the double-sideband optical signal to obtain two-dimensional quadrature amplitude modulation radio frequency (M)2-QAMRF) signal.
7. M of polarization multiplexing based intensity modulator according to claim 62-a QAM RF signal generating system, characterized by:
wherein, the laser is a DFB laser or an external cavity laser.
8. M of polarization multiplexing based intensity modulator according to claim 62-a QAM RF signal generating system, characterized by:
wherein the phase shift is 90 degrees or an integer multiple of 2 pi plus 90 degrees.
9. M of polarization multiplexing based intensity modulator according to claim 62-a QAM RF signal generating system, characterized by:
wherein, M is2-the phase shift of the QAM signal is 90 degrees or an integer multiple of 2 π plus 90 degrees.
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