CN112104422A - Multi-band carrier sensing communication system - Google Patents
Multi-band carrier sensing communication system Download PDFInfo
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- CN112104422A CN112104422A CN202011286521.XA CN202011286521A CN112104422A CN 112104422 A CN112104422 A CN 112104422A CN 202011286521 A CN202011286521 A CN 202011286521A CN 112104422 A CN112104422 A CN 112104422A
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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
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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
- H04B10/506—Multiwavelength transmitters
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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
- H04B10/572—Wavelength control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
Abstract
The invention discloses a multiband carrier sensing communication system, wherein: the wavelength division multiplexer is used for coupling a plurality of light wave signals with different wave bands into a beam of initial light wave signal and transmitting the beam of initial light wave signal to the light wave multiplexing module through an optical fiber; the optical wave multiplexing module is used for splitting the initial optical wave signal, respectively modulating and loading communication signal information and sensing signal information for the two split optical wave signals, modulating according to the spatial positions of a communication signal channel and a sensing signal channel in the carrier sensing optical fiber, and inputting the combined signals into the carrier sensing optical fiber for transmission; the wave demultiplexer is used for carrying out wave band separation on the communication light wave signals; and the optical filter is used for carrying out wave band separation on the sensing light wave signals. By adopting the scheme, multi-band light wave signal communication transmission can be realized, and the signal transmission capacity is greatly improved; and realize the common transmission of communication signal and sensing signal, namely when transmitting the communication signal, can be applied to the perception and transmission of external information.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multi-band carrier sensing communication system.
Background
In order to meet the requirements, an optical communication technology which is one of mainstream modes of information transmission is evolving optical communication from the aspects of multi-channel, high rate, ultra-large capacity, ultra-long distance and the like, so as to meet the requirements of future communication services such as ultra-wideband, data communication, cloud computing service and the like on further improvement of communication capacity.
The conventional single mode optical fiber has been continuously approaching the non-linear shannon limit in improving the information transmission capacity so that the transmission capacity is difficult to be improved, and thus a space division multiplexing principle providing a greater degree of freedom in the transverse spatial domain of the optical fiber is proposed. Mode division multiplexing technologies based on multimode optical fibers or few-mode optical fibers are being focused on by more and more researchers, and aim to maintain the necessary increase of optical fiber communication capacity, thereby supporting the exponential increase of internet traffic.
In the optical communication scheme adopted in the prior art, a single-waveband light wave signal is generally adopted for transmission, the signal transmission capacity still has a space for improving, and meanwhile, in the communication process, the optical fiber sensing signal is collected and transmitted independently of the communication signal.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a multiband carrier sensing communication system, which realizes multiband optical wave signal communication transmission and greatly improves the signal transmission capacity; and realize the common transmission of communication signal and sensing signal, namely when transmitting the communication signal, can be applied to the perception and transmission of external information.
The technical scheme is as follows: the invention provides a multi-band carrier sensing communication system, comprising: laser emitter, wavelength division multiplexer, light wave multiplexing module, carrier sensing optic fibre, wave demultiplexer, optical filter, processing module, wherein:
the wavelength division multiplexer is used for receiving a plurality of light wave signals of different wave bands sent by the laser transmitter, coupling the light wave signals into a beam of initial light wave signal, and transmitting the beam of initial light wave signal to the light wave multiplexing module through an optical fiber;
the optical wave multiplexing module is used for splitting the initial optical wave signal, respectively modulating and loading communication signal information and sensing signal information for the two split optical wave signals, modulating according to the spatial positions of a communication signal channel and a sensing signal channel in the carrier sensing optical fiber, and inputting the carrier sensing optical fiber for transmission after the two optical wave signals are combined;
the wave demultiplexer is used for carrying out wave band separation on the communication light wave signals output by the carrier sensing optical fiber and inputting the separated communication light wave signals into the processing module for analysis and processing;
and the optical filter is used for carrying out wave band separation on the sensing light wave signals from the backscattering of the carrier sensing optical fiber and inputting the separated sensing light wave signals into the processing module for analysis and processing.
Specifically, the optical fiber coupler further comprises a wave band coupler, which is used for coupling a plurality of optical wave signals with different wave bands emitted by the laser emitter into optical wave signals with O + E, S, C + L and L + U wave bands, and then inputting the optical wave signals into the wavelength division multiplexer.
Specifically, the optical fiber sensor further comprises a phase plate, and the phase plate is used for filtering the sensing light wave signal output by the carrier sensing optical fiber.
Specifically, the carrier sensing optical fiber is sequentially provided with a central core, a cladding, a ring core and a cladding from inside to outside, wherein the ring core is used for transmission of communication lightwave signals, and the central core is used for transmission of sensing lightwave signals.
Specifically, the optical wave multiplexing module includes a beam splitter, a first arbitrary waveform generator, a first electro-optic modulator, a first spatial light modulator, a first beam combiner, a second arbitrary waveform generator, a second electro-optic modulator, a second spatial light modulator, and a second beam combiner, where:
the beam splitter is used for splitting the initial light wave signal into at least two light wave signals;
the first arbitrary waveform generator, the first electro-optical modulator, the second arbitrary waveform generator and the second electro-optical modulator are respectively used for carrying out electric signal simulation and electro-optical conversion on input sensing signals and communication signals to generate sensing light wave signals and communication light wave signals;
the first spatial light modulator is used for modulating the sensing optical wave signal to generate a Gaussian beam optical wave signal corresponding to the spatial position of the central core, and the Gaussian beam optical wave signal is input into the central core after passing through the first beam combiner;
the second spatial light modulator is used for modulating the communication light wave signal to generate an annular light spot light wave signal corresponding to the spatial position of the ring core, and the annular light spot light wave signal is input into the ring core after passing through the first beam combiner;
and the second beam combiner is used for transmitting the sensing optical wave signal scattered by the central core to the optical filter.
Specifically, the optical wave multiplexing module further includes an isolator, a first polarizer and a second polarizer, wherein:
the isolator is arranged on the light path of the initial light wave signal incidence beam splitter; the first polarizer is arranged on a light path between the first spatial light modulator and the first beam combiner; the second polarizer is arranged on a light path between the second spatial light modulator and the first beam combiner.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the multi-band optical wave signal communication transmission is realized, and the signal transmission capacity is greatly improved;
(2) the common transmission of the communication signal and the sensing signal is realized, namely the communication signal is transmitted, and meanwhile, the sensing and transmission method can be applied to the sensing and transmission of external information.
Drawings
Fig. 1 is a schematic structural diagram of a multi-band carrier sensing communication system provided by the present invention;
FIG. 2 is a schematic diagram of a wave band of a light wave signal provided by the present invention;
FIG. 3 is a schematic cross-sectional view of a carrier sensing fiber according to the present invention;
fig. 4 is a schematic structural diagram of the optical wave multiplexing module provided by the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Fig. 1 is a schematic structural diagram of a multi-band carrier sensing communication system provided by the present invention.
The invention provides a multi-band carrier sensing communication system, comprising: laser emitter, wavelength division multiplexer, light wave multiplexing module, carrier sensing optic fibre, wave demultiplexer, optical filter, processing module, wherein:
the wavelength division multiplexer is used for receiving a plurality of light wave signals of different wave bands sent by the laser transmitter, coupling the light wave signals into a beam of initial light wave signal, and transmitting the beam of initial light wave signal to the light wave multiplexing module through an optical fiber;
the optical wave multiplexing module is used for splitting the initial optical wave signal, respectively modulating and loading communication signal information and sensing signal information for the two split optical wave signals, modulating according to the spatial positions of a communication signal channel and a sensing signal channel in the carrier sensing optical fiber, and inputting the carrier sensing optical fiber for transmission after the two optical wave signals are combined;
the wave demultiplexer is used for carrying out wave band separation on the communication light wave signals output by the carrier sensing optical fiber and inputting the separated communication light wave signals into the processing module for analysis and processing;
and the optical filter is used for carrying out wave band separation on the sensing light wave signals from the backscattering of the carrier sensing optical fiber and inputting the separated sensing light wave signals into the processing module for analysis and processing.
Fig. 2 is a schematic diagram of a wave band of a light wave signal according to the present invention.
In the embodiment of the invention, the multi-band carrier sensing communication system further comprises a band coupler, which is used for coupling a plurality of optical wave signals of different bands sent by the laser transmitter into optical wave signals of O + E, S, C + L and L + U bands, and then inputting the optical wave signals into the wavelength division multiplexer.
In a specific implementation, the optical band of a single mode fiber communication system may be divided into O, E, S, C, L and U-band. Wherein, the initial O wave band range is as follows: 1260nm-1360 nm; the extended E band range is: 1360nm-1460 nm; the short S band range is: 1460nm-1530 nm; the conventional C-band range is: 1530nm-1565 nm; the long L band range is: 1565nm-1625 nm; the ultra-long U wave band range is as follows: 1625nm-1675 nm. A plurality of light wave signals of different wave bands that laser emitter sent couple into the light wave signal of O + E, S, C + L and L + U wave band through the wave band coupler, namely can couple into the light wave signal who covers the full wave band, compares in the communication signal of single wave band among the prior art, and the light wave signal of full wave band is used for transmitting communication signal information and sensing signal information, can very big increase signal transmission's capacity.
In the embodiment of the invention, the multiband carrier sensing communication system also comprises a phase plate which is used for filtering the sensing light wave signal output by the carrier sensing optical fiber.
In specific implementation, the optical wave signal output by the carrier sensing optical fiber includes a sensing optical wave signal and a communication optical wave signal, the sensing optical wave signal from the central core can be filtered out through the phase plate to obtain a communication optical wave signal from the ring core, the communication optical wave signal can be separated from the communication optical wave signals of various wavelengths and wave bands through the wave demultiplexer to obtain communication optical wave signals of different wavelengths and wave bands, and then the communication optical wave signals enter the processing module to analyze and process communication signal information in the communication optical wave signals.
Fig. 3 is a schematic cross-sectional view of a carrier sensing optical fiber according to the present invention.
In the embodiment of the invention, the carrier sensing optical fiber is sequentially arranged into the central core, the cladding, the ring core and the cladding from inside to outside, wherein the ring core is used for transmitting communication optical wave signals, and the central core is used for transmitting sensing optical wave signals.
In specific implementation, the second spatial light modulator can be used for generating annular light spot light wave signals with different radiuses, the larger the topological load number of the light beam is, the larger the radius of the annular light spot light wave signals is so as to adapt to the cross-sectional area and the spatial position of the matched ring core, so that the annular light spot light wave signals can be emitted into the ring core of the carrier sensing optical fiber after being combined with Gaussian beam light wave signals carrying sensing light wave signals, and in addition, the first spatial light modulator is used for modulating and generating Gaussian beam light wave signals corresponding to the spatial position of the middle core and can be emitted into the middle core of the carrier sensing optical fiber after being combined. In other embodiments of the present invention, a central core may be used for the transmission of the communication lightwave signals, and a ring core may be used for the transmission of the sensing lightwave signals.
In specific implementation, because the cladding exists between the central core and the annular core, the central core and the annular core are not in contact with each other, and when signals are transmitted in the optical fiber, because of the uniqueness of the structure, the situation that optical fields are superposed with each other cannot occur, so that the common transmission of communication signals and sensing signals can be realized.
Fig. 4 is a schematic structural diagram of the optical wave multiplexing module according to the present invention.
In the embodiment of the present invention, the optical wave multiplexing module includes a beam splitter, a first arbitrary waveform generator, a first electro-optical modulator, a first spatial light modulator, a first beam combiner, a second arbitrary waveform generator, a second electro-optical modulator, a second spatial light modulator, and a second beam combiner, where:
the beam splitter is used for splitting the initial light wave signal into at least two light wave signals;
the first arbitrary waveform generator, the first electro-optical modulator, the second arbitrary waveform generator and the second electro-optical modulator are respectively used for carrying out electric signal simulation and electro-optical conversion on input sensing signals and communication signals to generate sensing light wave signals and communication light wave signals;
the first spatial light modulator is used for modulating the sensing optical wave signal to generate a Gaussian beam optical wave signal corresponding to the spatial position of the central core, and the Gaussian beam optical wave signal is input into the central core after passing through the first beam combiner;
the second spatial light modulator is used for modulating the communication light wave signal to generate an annular light spot light wave signal corresponding to the spatial position of the ring core, and the annular light spot light wave signal is input into the ring core after passing through the first beam combiner;
and the second beam combiner is used for transmitting the sensing optical wave signal scattered by the central core to the optical filter.
In an embodiment of the present invention, the optical wave multiplexing module further includes an isolator, a first polarizer, and a second polarizer, wherein:
the isolator is arranged on the light path of the initial light wave signal incidence beam splitter; the first polarizer is arranged on a light path between the first spatial light modulator and the first beam combiner; the second polarizer is arranged on a light path between the second spatial light modulator and the first beam combiner.
In a specific implementation, the original lightwave signal transmitted from the wavelength division multiplexer is split into two light beams (light path 1 and light path 2 in fig. 4) at the splitter after passing through the isolator, wherein the first lightwave signal is used for distributed sensing, and the second lightwave signal is used for a communication system, and the isolator is used for blocking the backscattered lightwave signal from the central core so as to effectively protect the input light source.
In the specific implementation, after the analog electrical signal of the first path of light wave signal of the sensing part is regulated and controlled by the first arbitrary waveform generator (AWG 1) and the electro-optic conversion of the first electro-optic modulator, a sensing light wave signal carrying the information of the sensing signal is generated at the first electro-optic modulator, then a gaussian beam is generated after the sensing light wave signal is modulated by the first spatial light modulator, and finally the gaussian beam is transmitted to the central core of the optical fiber through the first polarizer and the first beam combiner. Since a backward rayleigh scattering (OTDR) signal is utilized in the distributed sensing, the scattered sensing optical wave signal from the core is received at the second combiner, and the sensing optical wave signals of different wave bands received at the second combiner are subjected to wave band separation by the optical filter and finally reach the processing module for processing the sensing signal. The distributed sensing system based on the backward Rayleigh scattering is adopted, and the distributed sensing system can be used for detecting the bending condition of the optical fiber system by detecting the light intensity change of a backward Rayleigh scattering light wave signal. Through the integration of sensing and communication, the sensing-integrated full-waveband optical wave network system in the scheme of the invention can be applied to the sensing and transmission of external information.
In the specific implementation, after the second path of optical wave signals of the communication part are regulated and controlled by analog electric signals of a second arbitrary waveform generator (AWG 2) and subjected to electro-optical conversion of a second electro-optical modulator, communication optical wave signals carrying communication signal information are generated at the second electro-optical modulator, then the communication optical wave signals are modulated by a second spatial light modulator to generate annular light spots, and then the annular light spot optical wave signals are converged into a first beam combiner through a second polarizer and a reflector and finally transmitted into a ring core of an optical fiber through the first beam combiner. In addition, the two polarizers in the optical wave multiplexing module are used for adjusting the polarization directions of the two light beams.
In the specific implementation, the reflecting end of the optical wave multiplexing module receives the sensing optical wave signals backscattered from the central core, the received sensing optical wave signals of the full waveband can obtain the sensing optical wave signals of different wavelengths after passing through the tunable optical filter, and the sensing optical wave signals of each wavelength can be used for sensing and sensing physical quantities. Similarly, the processing module analyzes and processes the received sensing signals with various wavelengths.
In the specific implementation, the optical fiber sensing is a sensing technology which takes an optical fiber as a carrier and senses and transmits an external measured parameter. Compared with the traditional electric sensing, the optical fiber sensing has the characteristics of strong anti-electromagnetic interference capability, corrosion resistance, low transmission loss and the like, and is widely applied to bridge health monitoring, metallurgy, aerospace and military. The distributed optical fiber sensing adopted in the embodiment of the invention integrates the transmission medium and the sensing unit, and can realize continuous monitoring in space. The invention can select sensing signals with different wavelengths to carry out sensing analysis by utilizing the tunable optical filter, and can realize the detection of events such as optical fiber link loss, bending and the like based on the Rayleigh scattering type distributed sensing system. The wavelength of the scattered light of the rayleigh scattering in the optical fiber is equal to the wavelength of the incident light, and the frequency change is avoided, so that the optical fiber is elastic scattering. The main source of scattering in optical fibers is the scattering of light in all directions due to local fluctuations in the refractive index caused by random fluctuations in the fiber density during the fiber manufacturing process.
Claims (6)
1. A multi-band carrier-aware communication system, comprising: laser emitter, wavelength division multiplexer, light wave multiplexing module, carrier sensing optic fibre, wave demultiplexer, optical filter, processing module, wherein:
the wavelength division multiplexer is used for receiving a plurality of light wave signals of different wave bands sent by the laser transmitter, coupling the light wave signals into a beam of initial light wave signal, and transmitting the beam of initial light wave signal to the light wave multiplexing module through an optical fiber;
the optical wave multiplexing module is used for splitting the initial optical wave signal, respectively modulating and loading communication signal information and sensing signal information for the two split optical wave signals, modulating according to the spatial positions of a communication signal channel and a sensing signal channel in the carrier sensing optical fiber, and inputting the carrier sensing optical fiber for transmission after the two optical wave signals are combined;
the wave demultiplexer is used for carrying out wave band separation on the communication light wave signals output by the carrier sensing optical fiber and inputting the separated communication light wave signals into the processing module for analysis and processing;
and the optical filter is used for carrying out wave band separation on the sensing light wave signals from the backscattering of the carrier sensing optical fiber and inputting the separated sensing light wave signals into the processing module for analysis and processing.
2. The multi-band carrier sensing communication system of claim 1, further comprising a band coupler for coupling a plurality of optical wave signals of different bands emitted from said laser transmitter into optical wave signals of O + E, S, C + L and L + U bands, and then inputting the optical wave signals into said wavelength division multiplexer.
3. The multi-band carrier sensing communication system of claim 1, further comprising a phase plate for filtering out the sensor lightwave signal output by the carrier sensing fiber.
4. The multi-band carrier sensing communication system of claim 1, wherein the carrier sensing fibers are sequentially arranged in an order from inside to outside as a central core, a cladding, a ring core and a cladding, wherein the ring core is used for transmission of communication lightwave signals, and the central core is used for transmission of sensing lightwave signals.
5. The multi-band carrier-aware communication system of claim 4, wherein the optical multiplexing module comprises a beam splitter, a first arbitrary waveform generator, a first electro-optic modulator, a first spatial optical modulator, a first beam combiner, a second arbitrary waveform generator, a second electro-optic modulator, a second spatial optical modulator, a second beam combiner, wherein:
the beam splitter is used for splitting the initial light wave signal into at least two light wave signals;
the first arbitrary waveform generator, the first electro-optical modulator, the second arbitrary waveform generator and the second electro-optical modulator are respectively used for carrying out electric signal simulation and electro-optical conversion on input sensing signals and communication signals to generate sensing light wave signals and communication light wave signals;
the first spatial light modulator is used for modulating the sensing optical wave signal to generate a Gaussian beam optical wave signal corresponding to the spatial position of the central core, and the Gaussian beam optical wave signal is input into the central core after passing through the first beam combiner;
the second spatial light modulator is used for modulating the communication light wave signal to generate an annular light spot light wave signal corresponding to the spatial position of the ring core, and the annular light spot light wave signal is input into the ring core after passing through the first beam combiner;
and the second beam combiner is used for transmitting the sensing optical wave signal scattered by the central core to the optical filter.
6. The multi-band carrier sensing communication system of claim 5, wherein the optical wave multiplexing module further comprises an isolator, a first polarizer, and a second polarizer, wherein:
the isolator is arranged on the light path of the initial light wave signal incidence beam splitter; the first polarizer is arranged on a light path between the first spatial light modulator and the first beam combiner; the second polarizer is arranged on a light path between the second spatial light modulator and the first beam combiner.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114866184A (en) * | 2022-03-07 | 2022-08-05 | 周小辉 | Communication and sensing signal integrated fusion method, decomposition method and related device |
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Application publication date: 20201218 |