CN113783317A - Energy-signaling common transmission system and method based on few-mode optical fiber - Google Patents
Energy-signaling common transmission system and method based on few-mode optical fiber Download PDFInfo
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- CN113783317A CN113783317A CN202111330043.2A CN202111330043A CN113783317A CN 113783317 A CN113783317 A CN 113783317A CN 202111330043 A CN202111330043 A CN 202111330043A CN 113783317 A CN113783317 A CN 113783317A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
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Abstract
The invention provides a system and a method for energy communication and common transmission based on few-mode optical fibers, wherein the system comprises: the system comprises a control terminal, an energy source, a signal generating device, an energy communication optical fiber link, a photoelectric conversion unit and a signal extraction unit; the energy source is used for providing energy light under the control of the control terminal; the signal generating device is used for providing signal light under the control of the control terminal; the optical fiber link comprises a few-mode-single-mode hybrid transmission link used for transmitting the energy light and the signal light, the few-mode-single-mode hybrid transmission link comprises an optical fiber cable for signal transmission, an optical fiber in the optical fiber cable for signal transmission comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core; the photoelectric conversion unit is used for converting energy light output by the optical fiber communication link into an electric signal; and the signal extraction unit is used for extracting the signal light output by the optical fiber link.
Description
Technical Field
The invention relates to the technical field of optical fiber energy transmission and optical fiber communication, in particular to the technical field of optical fiber energy transmission and transmission, and particularly relates to an energy transmission and transmission system and method based on few-mode optical fibers.
Background
With the coming of the 5G communication era, the optical fiber information and energy co-transmission technology provides a solution for realizing a new generation of distributed micro base station, and the technology transmits radio frequency signals and energy light to the base station through optical fibers, so that the wireless broadband signals are transmitted by using an antenna while the base station is powered.
The existing communication optical fiber laying is mature and perfect, but an energy communication common transmission system for simultaneously transmitting signal light and energy light is still to be perfect. Most of the existing systems for carrying out energy and signal common transmission by using optical fibers are optical fiber information common transmission systems built on the basis of single-mode optical fibers. The single-mode optical fiber has low cost and small transmission loss, and is suitable for long-distance information transmission, but the single-mode optical fiber has small effective area and can only transmit a fundamental mode, so that the transmission power density is high, and the nonlinear effect is easy to generate. The capacity of the energy transmission in the single-mode fiber-based energy transmission system is influenced by the nonlinear effect, so that the output power is not high, and the system capacity is greatly influenced. Therefore, it is necessary to increase the maximum output power of the system, and how to increase the transmission capacity of the wireless communication system while ensuring low cost is a problem that is desired to be solved.
Disclosure of Invention
In view of the problems in the prior art, it is an object of the present invention to provide a signaling and co-transmission system and method based on few-mode optical fiber, which can greatly reduce the nonlinear effect by constructing a few-mode-single-mode hybrid link in the system, so as to eliminate or improve one or more defects in the prior art.
In one aspect of the present invention, a system for common transmission of information based on few-mode optical fibers is provided, the system comprising:
the system comprises a control terminal, an energy source, a signal generating device, an energy communication optical fiber link, a photoelectric conversion unit and a signal extraction unit;
the energy source is used for providing energy light under the control of the control terminal;
the signal generating device is used for providing signal light under the control of the control terminal;
the optical fiber link comprises a few-mode-single-mode hybrid transmission link used for transmitting the energy light and the signal light, the few-mode-single-mode hybrid transmission link comprises an optical fiber cable for signal transmission, an optical fiber in the optical fiber cable for signal transmission comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core;
the photoelectric conversion unit is used for converting energy light output by the optical fiber communication link into an electric signal; and
the signal extraction unit is used for extracting the signal light output by the optical fiber link.
In some embodiments of the present invention, the energy transmission part and the signal transmission part are different optical fibers in the same optical cable, and the energy transmission part transmits light by using a few-mode-single-mode hybrid transmission mode; the energy transmission part and the signal transmission part adopt different fiber cores in the same multi-core fiber in the same optical cable, and the energy transmission part adopts a few-mode-single-mode mixed transmission mode to transmit light; or the energy transmission part and the signal transmission part adopt a few-mode-single-mode mixed transmission mode to carry out optical transmission.
In some embodiments of the present invention, the optical fibers in the optical cable include a multi-core fiber and a single-core fiber, the multi-core fiber adopts a few-mode fiber at an initial end and a single-mode fiber at a tail end, and the single-core fiber is a single-mode fiber; the multi-core optical fiber is used as the energy transmission part, and the single-core optical fiber is used as the signal transmission part; or
Optical fiber in the optical cable includes many single core optical fibers, many single core optical fibers include single mode fiber and few mode-single mode hybrid fiber, wherein few mode-single mode hybrid fiber is as pass can the part, single mode fiber is as signal transmission part.
In some embodiments of the present invention, the optical fiber in the optical cable for signal transmission is a multi-core optical fiber, the multi-core optical fiber includes multiple fiber cores, one of the multiple fiber cores is a single-mode fiber core, the remaining multiple fiber cores are few modes, the signal transmission portion is a single-mode fiber core, and the energy transmission portion is a fiber core other than the single-mode fiber core serving as the signal transmission portion.
In some embodiments of the invention, the system further comprises: a first wavelength division multiplexing unit and a second wavelength division multiplexing unit; the first wavelength division multiplexing unit is used for optically coupling the energy light and the signal light into the optical communication fiber link; the second wavelength division multiplexing unit is used for performing wavelength division multiplexing decoupling at the output end of the optical communication fiber link so as to separate the energy light from the signal light.
In some embodiments of the present invention, the energy light is broad spectrum light between 1530nm-1580 nm.
In some embodiments of the present invention, the length of the optical fiber link is 10-30km, the length of the few-mode fiber core adopted at the initial end of the energy transmission part is 5-20km, and the length of the single-mode fiber core adopted at the tail end of the energy transmission part is 5-20 km.
In some embodiments of the present invention, the few-mode core and the single-mode core are connected by fusion.
In some embodiments of the present invention, the first wavelength division multiplexing unit and the second wavelength division multiplexing unit are dense wavelength division multiplexing units, a bandwidth of each channel is ± 15nm, and a maximum power is 5W.
In some embodiments of the present invention, the photoelectric conversion unit is a plurality of photoelectric conversion chips connected in a series-parallel hybrid manner, and each photoelectric conversion chip includes a plurality of series pn junctions of an indium gallium arsenide substrate.
The invention also provides a method for transmitting information and information based on few-mode optical fibers, which comprises the following steps:
generating energy light from an energy source;
generating signal light by a signal generating device;
transmitting the energy light and the signal light by using a few-mode-single-mode hybrid transmission link, wherein the few-mode-single-mode hybrid transmission link comprises an energy transmission optical cable, an optical fiber in the energy transmission optical cable comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core;
converting energy light output by the optical fiber link into an electric signal by the photoelectric conversion unit; and
and the signal extraction unit is used for extracting the signal light output by the optical fiber link.
The energy information common transmission system and method based on the few-mode optical fiber can greatly improve the transmission capacity of the system by adopting the few-mode-single-mode mixed transmission link, well control the cost increase, and have wide application prospect particularly in long-distance optical fiber energy transmission scenes.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a short-mode fiber-based common transmission system according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for simultaneous transmission of information and information based on few-mode optical fibers according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
It should be emphasized that the term "comprises/comprising/comprises/having" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
The invention aims to provide a communication system with self-power supply capability based on energy and information co-transmission of few-mode optical fibers. The energy-information common transmission system provided by the invention not only has the advantages of simple laying, low cost and self-supply of end point energy, but also can greatly improve the transmission capacity of the energy-information common transmission system.
In an embodiment of the present invention, a microsystem is provided, in which a few-mode-single-mode hybrid transmission link is used to implement self-power supply and information transmission, so as to construct an optical fiber communication network node with self-power supply capability, thereby not only providing a certain electric energy support, but also ensuring safe and reliable data communication and improving data transmission performance.
Fig. 1 is a schematic structural diagram of a short-mode fiber-based common transmission system according to an embodiment of the present invention. As shown in fig. 1, the signaling and co-transmission system based on few-mode optical fiber of the present invention is mainly composed of three parts, including: a central control section, a transport section and functional end points. The central control part has a computer control terminal (not shown), a high power energy source 1 and a signal generating module (i.e. a signal source) 2. The high-power energy source 1 serves as an energy supply end of the whole system and is used for providing energy light under the control of the control terminal, and the high-power energy source meets the requirements of high power, low density, single mode and the like, so that the energy loss in transmission is less. In an embodiment of the invention, the high power energy source 1 may be a pump laser source. The signal source 2 is for generating signal light under the control of the control terminal. The control terminal is used for controlling the signal generation module and the high-power energy source, a feedback mechanism of double-end communication can be realized, and whether the pumping energy supplies energy to the function endpoint is controlled by receiving information transmitted by the function endpoint. In the embodiment of the present invention, the function endpoint is a communication node that provides a specific function and requires energy supply, such as a base station, but the present invention is not limited thereto. The medium of the transmission section is an optical fiber link for simultaneously transmitting the energy light and the signal light. In the embodiment of the invention, the optical fiber link comprises an uplink optical fiber link and a downlink optical fiber link.
Most of the existing energy-signaling and common-transmitting systems use single-mode optical fibers to build an optical fiber energy-signaling and common-transmitting system, that is, the single-mode optical fibers are used as optical fiber links to transmit energy light and signal light simultaneously. However, in the single-mode optical fiber, when the single-mode optical fiber is used for transmitting energy light, due to high fiber-entering optical power, relatively severe stimulated brillouin scattering is generated, so that an energy light transmission link has a relatively high nonlinear effect, and thus, the transmission capacity of the whole optical fiber transmission system is relatively low, the output power is relatively low, and the transmission distance of the energy light is also influenced. For communication optical signals, stimulated brillouin scattering also limits the signal-to-noise ratio and communication distance of the communication system.
Stimulated brillouin scattering is an important nonlinear effect in optical fibers, and is a result of the action of strongly induced acoustic waves on incident light, and the back transmission of brillouin scattering light not only damages the light source, but also can cause the relative intensity noise of the laser to deteriorate and increase the attenuation of a system link. If the power of the incident light entering the fibre is large enough, above a certain threshold, the power of the backscattered light resulting from stimulated backscatter may exceed the power lost to attenuation by the fibre, and coherent amplification of the acoustic wave field and scattered optical field will occur, resulting in stimulated brillouin scattering, which will convert most of the input power into backscattered light (stokes light).
The inventor finds that, in the process of implementing the invention, because the mode field area of the few-mode fiber is larger than that of the single-mode fiber, the stimulated brillouin scattering threshold value in the few-mode fiber is larger than that of the single-mode fiber under the same distance, that is, the few-mode fiber can improve the transmission capacity of a system compared with the single-mode fiber. However, it is well known that few-mode fibers are much more expensive than single-mode fibers, and that direct use of few-mode fibers for long-distance fiber power and communication is not feasible in most cases. In order to suppress the single mode fiber from stimulated brillouin scattering, the embodiment of the invention provides a technical scheme for constructing an integral novel optical fiber transmission link by adopting few-mode fibers and the single mode fiber, and the energy output of a system can be greatly improved.
In an embodiment of the invention, a section of few-mode fiber is connected to the tail end of the high-power laser, and because the mode field area of the few-mode fiber is larger than that of the single-mode fiber, the stimulated brillouin scattering threshold value in the few-mode fiber is larger than that of the single-mode fiber under the same distance, so that the transmission capacity of the system can be improved. Mode field matching can be used to connect single mode fibers after few mode fibers.
More specifically, the few-mode fiber and the single-mode fiber may be connected by fusion splicing, such as core fusion splicing or cladding fusion splicing. In other embodiments of the present invention, a section of the few-mode optical fiber as a transition fiber having a mode field diameter between the first few-mode optical fiber and the single-mode optical fiber may be further provided between the few-mode optical fiber (the first few-mode optical fiber) and the single-mode optical fiber, and the section of the few-mode optical fiber is fusion-spliced with the first few-mode optical fiber and the single-mode optical fiber, respectively.
In an embodiment of the present invention, only one of the uplink optical fiber link and the downlink optical fiber link, for example, the uplink optical fiber link is an optical fiber link capable of communicating, and the other optical fiber link (e.g., the lower optical fiber link) is a communication transmission link only, or vice versa.
In an embodiment of the present invention, the optical fiber link is a few-mode-single-mode hybrid transmission link, and is used for transmitting the energy light and the signal light. The few-mode-single-mode hybrid transmission link comprises a signal transmission optical cable, wherein an optical fiber in the signal transmission optical cable comprises an energy transmission part and a signal transmission part. In one embodiment of the invention, the energy transmission part and the signal transmission part are different optical fibers in the same optical cable. Because the optical power of the energy transmission part (energy transmission optical fiber) is high, in order to improve the system capacity and reduce the nonlinear effect, particularly the stimulated Brillouin scattering, the few-touch optical fiber is adopted at the initial end of the energy transmission part to increase the mode and the mode field area of optical wave transmission and reduce the threshold value of the stimulated Brillouin scattering, so that the nonlinear effect is reduced, and the transmission capacity of the system is improved. Considering from the cost and performance of the whole system, the energy transmission link of the few-mode-single-mode hybrid link is constructed by still adopting a single-mode optical fiber mode at the tail end of the energy transmission part, and the few-mode optical fiber and the single-mode optical fiber can be connected in a mode field matching mode; and the signal transmission part can adopt single mode fiber due to lower signal light power, namely, only the energy transmission part adopts a few-mode-single-mode mixed transmission mode, so that the cost of the whole system is reduced on the basis of ensuring energy and signal transmission capacity.
In another embodiment of the invention, the energy transmission part and the signal transmission part adopt different cores in the same multi-core optical fiber in the same optical cable. The energy transmission part comprises an energy transmission part and an energy transmission part, wherein the energy transmission part is provided with a few-mode fiber core at the initial end and a single-mode fiber core at the tail end, and the few-mode fiber core and the single-mode fiber core can be connected through fusion in a fiber core fusion mode. At this time, the signal transmission part can only adopt a single-mode fiber core due to lower signal light power, that is, only the energy transmission part adopts a few-mode-single-mode mixed transmission mode, so that the cost of the whole system is reduced on the basis of ensuring energy and signal transmission capacity. As an example, the optical fiber in the optical cable for signal transmission is a multi-core optical fiber, the multi-core optical fiber includes multiple fiber cores, one of the multiple fiber cores is a single-mode fiber core, the others are few modes, the signal transmission portion is a single-mode fiber core, and the energy transmission portion is a fiber core other than the single-mode fiber core serving as the signal transmission portion.
In another embodiment of the present invention, the energy transmission part and the signal transmission part both adopt a few-mode-single-mode hybrid transmission mode to perform optical transmission, the energy light and the signal light are high-power lasers, and the energy transmission part and the signal transmission part both adopt few-mode optical fibers at the initial ends and still adopt a single-mode optical fiber at the tail ends to construct an energy transmission system of a few-mode-single-mode hybrid link.
In another embodiment of the invention, the energy transmission part and the signal transmission part both adopt a few-mode-single-mode hybrid transmission mode to transmit light, the energy light and the signal light are high-power lasers, the energy transmission part and the signal transmission part adopt different fiber cores in the same multi-core fiber in the same optical cable, the energy transmission part and the signal transmission part both adopt few-mode fiber cores at the initial ends, and the energy transmission part and the signal transmission part still adopt single-mode fiber cores at the tail ends to construct an energy transmission system of a few-mode-single-mode hybrid link.
In another embodiment of the present invention, the optical fibers in the optical cable include a multi-core fiber and a single-core fiber, the multi-core fiber adopts a few-mode fiber at an initial end, and a single-mode fiber at a tail end, and the single-core fiber is a single-mode fiber; the multi-core optical fiber is used as the energy transmission part, and the single-core optical fiber is used as the signal transmission part.
In another embodiment of the present invention, the optical fiber in the optical cable includes a plurality of single-core optical fibers, and the plurality of single-core optical fibers include a single-mode optical fiber and a few-mode-single-mode hybrid optical fiber, wherein the few-mode-single-mode hybrid optical fiber serves as the energy transmission section, and the single-mode optical fiber serves as the signal transmission section.
In another embodiment of the present invention, the optical fiber in the optical cable includes a plurality of single-core optical fibers, and each of the plurality of single-core optical fibers is a few-mode-single-mode hybrid optical fiber, wherein a part of the few-mode-single-mode hybrid optical fiber is used as an energy transmission part, and a part of the few-mode-single-mode hybrid optical fiber is used as a signal transmission part.
In another embodiment of the present invention, the optical fiber in the optical cable includes a plurality of single-core optical fibers, and each of the plurality of single-core optical fibers is a few-mode-single-mode hybrid optical fiber, wherein a part of the few-mode-single-mode hybrid optical fiber is used as an energy transmission part, and a part of the few-mode-single-mode hybrid optical fiber is used as a signal transmission part.
In another embodiment of the present invention, the energy transmission portion and the signal transmission portion may share one optical fiber for transmitting the energy light and the signal light, where the optical fiber in the optical cable may be a multi-core fiber or a single-core fiber, the multi-core fiber or the single-core fiber is a few-mode-single-mode hybrid fiber, the energy light and the signal light are both high-power lasers, the energy light and the signal light respectively utilize different wavelength bands, the energy light and the signal light may be coupled to the energy communication fiber link by using the first wavelength division multiplexing unit, and the energy light and the signal light may be decoupled by using the second wavelength division multiplexing unit at an output end of the energy communication fiber link for wavelength division multiplexing, so as to separate the energy light and the signal light. As shown in fig. 1, energy light and signal light of different wavebands can be multiplexed by a wavelength division multiplexer 3 at the initial end of the optical fiber and then input to the few-mode optical fiber in the at least mode-single mode hybrid optical fiber 4, and the energy light and the signal light of different wavebands can be separated by the wavelength division multiplexer 3 at the output end of the single mode optical fiber and are respectively provided to a photoelectric energy management unit 5 and a signal extraction unit 6 for energy supply and communication.
In an embodiment of the present invention, the pump laser source 1 is a high-power semiconductor laser with a broadened wavelength, and the laser wavelength emitted by the laser is continuously adjustable, so that the laser can transmit large energy without damaging the optical fiber due to too high energy density, and the loss is low, and when transmitting an energy optical signal, a broad spectrum light between 1530nm and 1580nm is preferably used, but the present invention is not limited thereto. The energy source part generating the energy light can pass through the limited light source line width, so that the optical power coupled into the optical fiber can be further improved. In the optical coupling part of the energy light and the signal light, the bandwidth of each channel in the coupler is +/-15 nm, and the maximum power is 5W. In the optical fiber transmission part, a few-mode-single-mode hybrid link is adopted, so that the transmission loss can be reduced, and the nonlinear effect can be better inhibited. The photoelectric conversion and energy management unit has the functions of energy storage and output, and also has the advantages of small quality, good stability, adjustable output energy and the like.
In the example shown in fig. 1, in the energy-shared transmission system based on the few-mode optical fiber newly proposed by the present invention, high-power laser is coupled into a novel few-mode-single-mode hybrid optical fiber link for transmission as energy light and signal light in a wavelength division multiplexing manner, the wavelength division multiplexing decoupling is performed at an output end of the link, the energy light and the signal light are separated, wherein the energy light is connected to a dedicated photoelectric energy management unit, and the signal light is connected to a signal extraction unit.
In an example of the present invention, the photoelectric energy management unit 5 is a specially-made photoelectric conversion chip for 1550nm wavelength, each chip is composed of a plurality of pn junctions with indium gallium arsenic bases connected in series, and different chips can be connected in a series-parallel hybrid manner, so that the photoelectric energy management unit can achieve at least 30% of photoelectric conversion efficiency. The converted electrical energy is available to the load. The photoelectric conversion chip can adopt an optical fiber beam combiner to couple light energy in the energy transmission part to supply to a photocell, the light energy in the photocell is converted into electric energy in a photoelectric mode to complete photoelectric conversion, the photocell converts the light energy into the electric energy and then stores the electric energy in a high-energy-density battery to be used by loads such as a wireless base station, and the high-energy-density battery can also supply the electric energy to other loads such as lighting equipment and sound production equipment. The signal extraction unit 6 is configured to extract a signal 6, and the extracted signal is further subjected to physical layer filtering and non-physical layer processing to reduce the error rate of the signal, and finally extract a correct transmission signal 7. The signal extraction unit 6 may extract the control signal and the data signal.
In the embodiment of the invention, the loss of each interface is ensured to be as small as possible by adopting the few-mode-single-mode hybrid optical fiber which has low loss and interference resistance and is suitable for various environments.
Experiments prove that the maximum output optical power of the ultra-low loss single-mode optical fiber with the length of 28km is 450mW, the maximum output optical power of the novel optical fiber link formed by compounding the few-mode optical fiber and the single-mode optical fiber is 643mW, and the maximum output optical power of the system is improved by 42.8%. After the output optical power passes through the photoelectric energy management unit, 200mW electric energy can be stably output. The conversion efficiency of the photovoltaic energy management unit is greater than 30%. The system improves the transmission capacity of the system to a large extent and well controls the cost increase.
In the embodiment of the invention, the length ratio of the few-mode fiber to the single-mode fiber in the few-mode-single-mode hybrid fiber can be reasonably adjusted according to factors such as the whole transmission distance, the laser power and the like. Since the threshold of the stimulated brillouin scattering of the single-mode fiber is related to factors such as the fiber length and the mode field area, in an embodiment of the present invention, the length of the single-mode fiber may be controlled based on an arrangement scenario of the actual fiber so that the threshold of the stimulated brillouin scattering meets a predetermined threshold condition, and then the length of the few-mode portion may be determined based on the total fiber length and the length of the single-mode portion. As an example, the length of the optical fiber link can be 10-30km, the length of the few-mode core used at the initial end of the energy transmission part can be 5-20km, and the length of the single-mode core used at the end of the energy transmission part can be 5-20km, and the length ratio is only an example and the present invention is not limited thereto.
In the embodiment of the invention, the few-mode-single-mode hybrid optical fiber is packaged in the protective layer of the optical cable. The optical cable can be a special optical cable, and the special optical cable is coiled integrally by taking special glue as a medium, so that the optical cable is continuous and tough in the optical fiber laying process.
The energy communication common transmission system based on the few-mode optical fiber can greatly improve the transmission capacity of the system by adopting the few-mode-single-mode hybrid transmission link, well controls the cost increase, and has wide application prospect particularly in a long-distance optical fiber energy transmission scene.
Based on the above system, the present invention further provides a method for common transmission of information based on few-mode optical fiber, as shown in fig. 2, the method includes the following steps:
in step S110, energy light is generated by an energy source.
The energy source may be a high power pump laser source.
In step S120, the signal generating device generates signal light.
Step S130, transmitting energy light and signal light by using a few-mode single-mode hybrid transmission link, wherein the few-mode single-mode hybrid transmission link comprises an energy transmission optical cable, an optical fiber in the energy transmission optical cable comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core.
The structure of the few-mode-single-mode hybrid transmission link has been described above and will not be described in detail herein.
In step S140, the photoelectric conversion unit converts the energy light output through the optical fiber link into an electrical signal.
The photoelectric conversion unit may include a plurality of photoelectric conversion chips connected in a series-parallel hybrid manner, each chip being composed of a plurality of pn junctions of an indium gallium arsenide substrate connected in series.
In step S150, the signal extraction unit extracts the signal light output by the optical fiber link.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A few-mode fiber-based information co-transmission system, comprising: the system comprises a control terminal, an energy source, a signal generating device, an energy communication optical fiber link, a photoelectric conversion unit and a signal extraction unit;
the energy source is used for providing energy light under the control of the control terminal;
the signal generating device is used for providing signal light under the control of the control terminal;
the optical fiber link comprises a few-mode-single-mode hybrid transmission link used for transmitting the energy light and the signal light, the few-mode-single-mode hybrid transmission link comprises an optical fiber cable for signal transmission, an optical fiber in the optical fiber cable for signal transmission comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core;
the photoelectric conversion unit is used for converting energy light output by the optical fiber communication link into an electric signal; and
the signal extraction unit is used for extracting the signal light output by the optical fiber link.
2. The system of claim 1,
the energy transmission part and the signal transmission part adopt different optical fibers in the same optical cable, and the energy transmission part adopts a few-mode-single-mode mixed transmission mode to carry out optical transmission;
the energy transmission part and the signal transmission part adopt different fiber cores in the same multi-core fiber in the same optical cable, and the energy transmission part adopts a few-mode-single-mode mixed transmission mode to transmit light; or
The energy transmission part and the signal transmission part adopt a few-mode-single-mode mixed transmission mode to carry out optical transmission.
3. The system of claim 1,
the optical fiber in the optical cable comprises a multi-core optical fiber and a single-core optical fiber, wherein the initial end of the multi-core optical fiber adopts a few-mode optical fiber, the tail end of the multi-core optical fiber adopts a single-mode optical fiber, and the single-core optical fiber is a single-mode optical fiber; the multi-core optical fiber is used as the energy transmission part, and the single-core optical fiber is used as the signal transmission part; or
Optical fiber in the optical cable includes many single core optical fibers, many single core optical fibers include single mode fiber and few mode-single mode hybrid fiber, wherein few mode-single mode hybrid fiber is as pass can the part, single mode fiber is as signal transmission part.
4. The system of claim 1, wherein the optical fiber in the optical cable for signal transmission is a multicore fiber, the multicore fiber comprising a plurality of bundles of cores, one of the bundles being a single-mode core and the others being few modes, the signal transmission section being a single-mode core, and the energy transmission section being a core other than the single-mode core as the signal transmission section.
5. The system according to any one of claims 1-4, further comprising: a first wavelength division multiplexing unit and a second wavelength division multiplexing unit;
the first wavelength division multiplexing unit is used for optically coupling the energy light and the signal light into the optical communication fiber link;
the second wavelength division multiplexing unit is used for performing wavelength division multiplexing decoupling at the output end of the optical fiber link so as to separate energy light from signal light;
the first wavelength division multiplexing unit and the second wavelength division multiplexing unit are dense wavelength division multiplexing units, the bandwidth of each channel is +/-15 nm, and the maximum power is 5W.
6. The system according to any of claims 1-4, wherein the energy light is broad spectrum light between 1530nm and 1580 nm.
7. The system according to any one of claims 1-4, wherein the length of the optical fiber link is 10-30km, the length of the few-mode core adopted at the initial end of the energy transmission part is 5-20km, and the length of the single-mode core adopted at the end of the energy transmission part is 5-20 km.
8. The system according to any of claims 1-4, wherein the few-mode core and the single-mode core are connected by fusion.
9. The system of claim 1, wherein the photoelectric conversion unit is a plurality of photoelectric conversion chips connected in a series-parallel hybrid manner, and each photoelectric conversion chip comprises a plurality of series pn junctions of indium gallium arsenide substrates.
10. A method for transmitting information and information based on few-mode optical fibers is characterized by comprising the following steps:
generating energy light from an energy source;
generating signal light by a signal generating device;
transmitting the energy light and the signal light by using a few-mode-single-mode hybrid transmission link, wherein the few-mode-single-mode hybrid transmission link comprises an energy transmission optical cable, an optical fiber in the energy transmission optical cable comprises an energy transmission part and a signal transmission part, at least the initial end of the energy transmission part adopts a few-mode fiber core, and the tail end adopts a single-mode fiber core;
converting energy light output by the optical fiber link into an electric signal by the photoelectric conversion unit; and
and the signal extraction unit is used for extracting the signal light output by the optical fiber link.
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