CN111464240B - Vector radio frequency signal generation system based on polarization multiplexing intensity modulator - Google Patents
Vector radio frequency signal generation system based on polarization multiplexing intensity modulator Download PDFInfo
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- CN111464240B CN111464240B CN202010233063.7A CN202010233063A CN111464240B CN 111464240 B CN111464240 B CN 111464240B CN 202010233063 A CN202010233063 A CN 202010233063A CN 111464240 B CN111464240 B CN 111464240B
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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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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- 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
- H04B10/541—Digital intensity or amplitude modulation
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Abstract
The invention belongs to the technical field of radio-over-fiber communication, and particularly relates to a vector radio-frequency signal generation system based on a polarization multiplexing intensity modulator. The system comprises a laser, a polarization beam splitter, a first radio frequency signal source, a second radio frequency signal source, a polarization multiplexing intensity modulator, a polarization beam coupler, an optical amplifier, an optical filter and a photoelectric detector which are connected in sequence; the invention utilizes a polarization multiplexing intensity modulator to combine devices such as an optical filter, a photoelectric detector and the like to realize the generation of vector radio frequency signals; the method of photon synthesis is adopted, and polarization multiplexing is utilized to overcome the crosstalk of optical signals with different frequencies; one modulator bears RF signals with different frequencies and is changed into optical signals which are transmitted by optical fibers, and because the polarization directions of the two RF signals are orthogonal, the PD does not have any interference, the system performance of the optical fiber wireless fusion communication is effectively improved, and the ROF system-based access network can play a great advantage in the future.
Description
Technical Field
The invention belongs to the technical field of radio over fiber communication, and particularly relates to a vector radio frequency signal generation system based on a polarization multiplexing intensity modulator.
Background
Radio-over-Fiber (ROF) technology is receiving attention due to its excellent performance, such as high effective bandwidth, good mobility, small transmission loss, and is expected to be exposed in future access networks. Meanwhile, the vector modulation format can transmit more information on a limited bandwidth with high spectral efficiency, so that the bandwidth requirement of an optoelectronic device can be reduced, the sensitivity of a receiver is improved, and therefore, the vector modulation format is widely researched. The combination of vector modulation and radio over fiber communication can greatly increase the transmission capacity of the system while maintaining its excellent performance, and will certainly become a key technology in the future. However, how to generate stable low-cost optical vector rf signals is a major challenge at present, and is one of the key technologies for promoting the commercialization of ROF systems.
In the prior art, an optical heterodyne method is used in an ROF system to up-convert a data signal to a millimeter wave frequency band, double frequency modulation is realized by utilizing optical suppressed carrier (OCS) modulation, an electrical carrier is added to a mach-zehnder (MZ) modulator to perform suppressed carrier modulation, the modulated optical carrier is eliminated, and two remaining 1-order sidebands are subjected to beat on a Photodetector (PD) to generate a signal with the frequency twice the electrical carrier frequency. However, this synthesis by electrical multiplexing and then modulating an intensity modulator produces a multi-frequency ROF signal, the synthesis of electrical signals is prone to cross-talk due to reflections and the like. Therefore, it is necessary to provide a novel vector rf signal generating system with simple structure, easy implementation and excellent performance.
The technical problem to be solved by the present invention is to provide a vector rf signal generating system based on a polarization multiplexing intensity modulator, aiming at the above-mentioned deficiencies in the prior art. Polarization multiplexing is used to overcome crosstalk of optical signals of different frequencies by using a method of photon synthesis. Reasonable in design, simple structure, it is convenient to realize, can effectively use and generate vector radio frequency signal in ROF communication, excellent in use effect, convenient to popularize and use.
Disclosure of Invention
The invention aims to provide a vector radio frequency signal generating system based on a polarization multiplexing intensity modulator, which has a simple structure and excellent performance.
The invention provides a vector radio frequency signal generating system based on a polarization multiplexing intensity modulator, which comprises: the system comprises a Laser (LD), a Polarization Beam Splitter (PBS), a first radio frequency signal source, a second radio frequency signal source, a polarization multiplexing intensity modulator, a Polarization Beam Coupler (PBC), an optical amplifier, an optical filter and a Photoelectric Detector (PD); wherein:
the Laser (LD) is used for generating continuous wave laser with specified frequency for optical fiber communication;
the Polarization Beam Splitter (PBS) is used for carrying out polarization diversity on the optical signals sent by the Laser (LD) to obtain optical signals in the X polarization direction and the Y polarization direction;
the first radio frequency signal source is configured to generate a radio frequency signal with a frequency f1, and drive a sub-intensity modulator in the polarization multiplexing intensity modulator: X-Pol IM;
the second rf signal source is configured to generate an rf signal with a frequency f2 and drive a sub-intensity modulator in the polarization multiplexing intensity modulator: Y-Pol IM;
the polarization multiplexing intensity modulator comprises two sub-intensity modulators, namely an X-Pol IM and a Y-Pol IM, and is used for respectively receiving optical signals in the X polarization direction and the Y polarization direction from a Polarization Beam Splitter (PBS); the modulator has two orthogonal polarization states, each sub-intensity modulator comprises one polarization state, so that output signals of the two sub-intensity modulators are orthogonal, and finally, one path of output is synthesized through a polarization beam coupler PBC;
the Polarization Beam Coupler (PBC) couples two beams of orthogonal polarized light into one optical fiber and inputs the optical fiber into the optical amplifier;
the optical amplifier is used for amplifying an optical signal in the optical fiber link and inputting the optical signal into the optical filter;
the optical filter is used for filtering out a single sideband signal; and inputting the signal into a Photodetector (PD);
the Photoelectric Detector (PD) realizes photoelectric conversion of optical signals and converts the optical signals into electric signals.
In the invention, X-Pol IM and Y-Pol IM work at the orthogonal points respectively;
in the invention, the optical amplifier is an erbium-doped fiber amplifier;
in the invention, the optical filter can adopt a tunable optical fiber filter, a wavelength division multiplexing filter, an optical interleaver and the like;
the work flow of the vector radio frequency signal generation system comprises the following steps: the laser outputs a continuous wave optical carrier with a specified frequency, and the continuous wave optical carrier is injected into the polarization multiplexing intensity modulator after polarization diversity is carried out by the polarization beam splitter PBS. The first and second radio frequency signal sources with frequencies f1 and f2 are respectively used for driving X-Pol IM and Y-Pol IM (both arranged at orthogonal points) to enable the X-Pol IM and the Y-Pol IM to carry two independent radio frequency signals with different frequencies, then two beams of orthogonal polarized light are coupled into one optical fiber through a polarized beam coupler PBC, then the optical signal is amplified by an optical amplifier, then the optical signal passes through an optical filter in an optical fiber link to filter out a single sideband signal, and finally the optical signal is injected into a photoelectric detector PD to realize photoelectric conversion of the optical signal and generate a vector radio frequency signal.
Wherein, the first radio frequency signal source is: the local oscillation signal passes through the frequency doubler and then is up-converted with the I/Q baseband signal in the IQ frequency mixer, and the up-converted local oscillation signal is amplified by the electric amplifier and then is used for driving the X-Pol IM. The second radio frequency signal source is: the local oscillator signal and the I/Q baseband signal realize up-conversion in an IQ mixer, and are amplified by an electric amplifier to drive Y-Pol IM.
The invention realizes the generation of vector radio frequency signals by utilizing a polarization multiplexing intensity modulator to combine devices such as an optical filter, a photoelectric detector and the like. Polarization multiplexing is used to overcome crosstalk of optical signals of different frequencies by using a photon synthesis method. One modulator carries RF signals with different frequencies and changes the RF signals into optical signals to be transmitted by optical fibers, and because the polarization directions of the two RF signals are orthogonal, the PD does not have any interference. The system performance of the optical fiber wireless converged communication is effectively improved, and the access network mainly based on the ROF system can be brought into play with great advantages in the future.
Drawings
Fig. 1 is a schematic diagram of the structure of a vector radio frequency signal generating system based on a polarization multiplexing intensity modulator in the invention.
Fig. 2 is a schematic diagram of the structure of a first rf signal source in the present invention.
Fig. 3 is a schematic diagram of a second rf signal source according to the present invention.
Fig. 4 is a schematic illustration of the system output in the present invention.
Reference numbers in the figures: 1 is a Laser (LD), 21 is a first rf signal source, 22 is a second rf signal source, 3 is a Polarization Beam Splitter (PBS), 4 is a Polarization Beam Coupler (PBC), 5 is a polarization multiplexing intensity modulator, 61 is a first sub-intensity modulator (X-Pol IM), 62 is a second sub-intensity modulator (Y-Pol IM), 7 is an optical amplifier, 8 is an optical filter, 9 is a Photodetector (PD); 101. 102 is a local oscillator signal, 11 is a frequency doubler, 121, 122 are I/Q baseband signals, 131, 132 are IQ mixers, 141 are electrical amplifiers, and 142 are electrical amplifiers.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, in the vector rf signal generating system based on the polarization multiplexing intensity modulator, the components and functions are respectively described as follows:
the laser 1 is used for generating continuous wave optical carriers of specified frequencies for optical fiber communication. The first rf signal source 21 generates an rf signal with a frequency f 1. And a second rf signal source 22 for generating an rf signal with a frequency f 2. And a polarization beam splitter 3 (PBS) for performing polarization diversity on the optical signal to obtain optical signals in the X-polarization direction and the Y-polarization direction. A polarization beam coupler 4 (PBC) couples two orthogonally polarized light beams into one optical fiber. The polarization multiplexing intensity modulator 5 comprises two sub-intensity modulators, namely a first intensity modulator 61 (X-Pol IM) and a second intensity modulator 62 (Y-Pol IM). The modulator has two orthogonal polarization states, each sub-intensity modulator contains one polarization state, so that output signals of the two sub-intensity modulators are orthogonal, and finally, one output is synthesized through a polarization beam coupler 4 (PBC). And an optical amplifier 7 for amplifying the optical signal in the optical fiber link. An optical filter 8 for filtering out the single sideband signal. And the photoelectric detector 9 is used for realizing photoelectric conversion of optical signals and converting the optical signals into electric signals.
The laser 1 outputs a continuous wave optical carrier of a predetermined frequency, and polarization diversity is performed by a polarization beam splitter 3 (PBS) and then injected into a polarization multiplexing intensity modulator 5. The first rf signal source 21 with frequency f1 is used to drive the first intensity modulator 61 (X-Pol IM), the second rf signal source 22 with frequency f2 is used to drive the second intensity modulator 62 (Y-Pol IM), so that the polarization multiplexing intensity modulator 5 carries two independent rf signals with different frequencies (both X-Pol IM and Y-Pol IM are set at an orthogonal point), then the two beams of orthogonally polarized light are coupled into one optical fiber through the polarization beam coupler 4 (PBC), then the optical signal is amplified by the optical amplifier 7, and then the optical signal passes through the optical filter 8 in the optical fiber link to filter out a single-side band signal, and finally the single-side band signal is injected into the photodetector 9 (PD) to realize the optical-electrical conversion of the optical signal, and generate a vector rf signal.
The first rf signal source 21 is: the local oscillator signal passes through the frequency doubler 11, and the I/Q baseband signal 121 is up-converted in the IQ mixer 131, and amplified by the electrical amplifier 141 to drive the X-Pol IM. The second rf signal source 22 is: the local oscillator signal and the I/Q baseband signal 122 are up-converted in the IQ mixer 132, amplified by the electrical amplifier 142, and used to drive the Y-Pol IM.
Fig. 1 is specifically connected as follows:
the output of laser instrument 1 is connected with the input of polarization beam splitter 3 (PBS), the output of polarization beam splitter 3 (PBS) is connected with the optical input of polarization multiplexing intensity modulator 5, the optical output of polarization multiplexing intensity modulator 5 is connected with the input of polarization beam coupler 4 (PBC), the output of polarization beam coupler 4 (PBC) is connected with the input of optical amplifier 7, the output of optical amplifier 7 is connected with optical fiber for the input of optical filter 8, optical fiber for the output of optical filter 8 and the input of photoelectric detector 9. The first rf signal source 21 is connected to the electrical input of the first sub-intensity modulator 61 (X-Pol IM) by a cable, and the first rf signal source 22 is connected to the electrical input of the second sub-intensity modulator 62 (Y-Pol IM) by a cable.
Fig. 2 is connected as follows: all the parts are connected by cables.
Fig. 3 is specifically connected as follows: all the parts are connected by cables.
The vector radio frequency signal generation system based on the polarization multiplexing intensity modulator overcomes crosstalk of optical signals with different frequencies by adopting a photon synthesis method and utilizing polarization multiplexing, has reasonable design, simple structure and convenient realization, can be effectively applied to ROF communication to generate the vector radio frequency signal, and improves the system performance.
Claims (3)
1. A system for generating a vector radio frequency signal based on a polarization multiplexed intensity modulator, comprising: the device comprises a laser, a polarization beam splitter, a first radio frequency signal source, a second radio frequency signal source, a polarization multiplexing intensity modulator, a polarization beam coupler, an optical amplifier, an optical filter and a photoelectric detector; wherein:
the laser is used for generating continuous wave laser with specified frequency for optical fiber communication;
the polarization beam splitter is used for carrying out polarization diversity on the optical signals emitted by the laser to obtain optical signals in the X polarization direction and the Y polarization direction;
the first radio frequency signal source is configured to generate a radio frequency signal with a frequency f1, and drive a sub-intensity modulator in the polarization multiplexing intensity modulator: X-Pol IM;
the second radio frequency signal source is configured to generate a radio frequency signal with a frequency f2, and drive a sub-intensity modulator in the polarization multiplexing intensity modulator: Y-Pol IM;
the polarization multiplexing intensity modulator comprises two sub-intensity modulators, namely an X-Pol IM and a Y-Pol IM, and is used for respectively receiving optical signals in the X polarization direction and the Y polarization direction from the polarization beam splitter; the modulator has two orthogonal polarization states, each sub-intensity modulator comprises one polarization state, so that output signals of the two sub-intensity modulators are orthogonal, and finally, one path of output is synthesized through a polarization beam coupler PBC;
the polarized light beam coupler couples two beams of orthogonal polarized light into one optical fiber and then inputs the optical fiber into the optical amplifier;
the optical amplifier is used for amplifying an optical signal in the optical fiber link and inputting the optical signal into the optical filter;
the optical filter is used for filtering out a single sideband signal; and inputting the signal into a photoelectric detector;
the photoelectric detector realizes photoelectric conversion of optical signals and converts the optical signals into electric signals;
the connection relationship of each component is as follows: the output end of the laser is connected with the input end of the polarization beam splitter, the output end of the polarization beam splitter is connected with the optical input end of the polarization multiplexing intensity modulator, the optical output end of the polarization multiplexing intensity modulator is connected with the input end of the polarization beam coupler, the output end of the polarization beam coupler is connected with the input end of the optical amplifier, the output end of the optical amplifier is connected with the input end of the optical filter 8 by an optical fiber, and the output end of the optical filter is connected with the input end of the photoelectric detector by an optical fiber; the first radio frequency signal source is connected with the electric input end of a first sub-intensity modulator X-Pol IM in the polarization multiplexing intensity modulator through a cable, and the first radio frequency signal source is connected with the electric input end of a second sub-intensity modulator Y-Pol IM in the polarization multiplexing intensity modulator through a cable;
wherein, the first radio frequency signal source is: the local oscillator signal passes through a frequency doubler and then is up-converted with the I/Q baseband signal in an IQ mixer, and the local oscillator signal is amplified by an electric amplifier and then is used for driving the X-Pol IM; the second radio frequency signal source is: the local oscillator signal and the I/Q baseband signal realize up-conversion in an IQ mixer, and are used for driving Y-Pol IM after being amplified by an electric amplifier;
two sub-intensity modulators X-Pol IM and Y-Pol IM in the polarization multiplexing intensity modulator work at orthogonal points respectively;
the work flow of the system is as follows: the laser outputs continuous wave light carrier with specified frequency, and the continuous wave light carrier is injected into the polarization multiplexing intensity modulator after polarization diversity is carried out by the polarization beam splitter; the radio frequency signal sources with the frequencies of f1 and f2 generated by the first and second radio frequency signal sources respectively drive two sub-intensity modulators X-Pol IM and Y-Pol IM in the polarization multiplexing intensity modulator to enable the sub-intensity modulators to bear two independent radio frequency signals with different frequencies, then the two beams of orthogonal polarized light are coupled into an optical fiber through a polarization beam coupler, then the optical signal is amplified by an optical amplifier, a single-sideband signal is filtered out through an optical filter in an optical fiber link, and finally the optical signal is injected into a photoelectric detector to realize the photoelectric conversion of the optical signal and generate a vector radio frequency signal.
2. The polarization multiplexed intensity modulator-based vector radio frequency signal generation system of claim 1, wherein the optical amplifier is an erbium doped fiber amplifier.
3. The polarization multiplexed intensity modulator-based vector radio frequency signal generation system of claim 1, wherein the optical filter employs a tuned fiber filter, a wavelength division multiplexed filter, or an optical interleaver.
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| CN113162694B (en) * | 2021-02-23 | 2022-12-20 | 复旦大学 | Photon auxiliary vector millimeter wave signal generation system |
| CN113098614B (en) * | 2021-03-12 | 2022-03-29 | 西安邮电大学 | Polarization multiplexing single sideband signal generating and receiving system and method |
| CN113810149B (en) * | 2021-09-23 | 2023-09-15 | 烽火通信科技股份有限公司 | Wavelength label transmission method and device |
| CN114793306A (en) * | 2022-04-06 | 2022-07-26 | 上海穹窿科技有限公司 | Optical switching device based on beacon-free high-speed space optical communication |
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