CN107171731B - A kind of optical fiber eigen mode multiplexed communications method and system - Google Patents
A kind of optical fiber eigen mode multiplexed communications method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/2581—Multimode transmission
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
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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
- H04B10/40—Transceivers
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- H—ELECTRICITY
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- H04J14/00—Optical multiplex systems
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Abstract
The invention discloses a kind of optical fiber eigen mode multiplexed communications method and system, this method directly using optical fiber eigen mode as information carrier, by multiple optical fiber eigen modes in the multimode fibre that eigen mode separates low crosstalk multiplexing transmission.The system includes transmitting terminal, multichannel eigen mode multiplexer, the multimode fibre of eigen mode separation, the image intensifer of eigen mode separation, multichannel eigen mode demultiplexer and receiving end.Wherein, effective refractive index difference is big between the multichannel optical fiber eigen mode that the multimode fibre of eigen mode separation is supported, crosstalk is low, multichannel eigen mode multiplexer realizes the conversion and multiplexing of multichannel Gaussian mode to optical fiber eigen mode, multichannel eigen mode demultiplexer realizes conversion and demultiplexing of the multichannel optical fiber eigen mode to Gaussian mode, and multiplexing and demultiplexing is expansible and provides single mode optical fiber interface.The present invention supports multichannel optical fiber eigen mode low crosstalk multiplexed communications, it is not necessary that mostly into Digital Signal Processing is had more, compatible single mode optical fiber can effectively improve message capacity and spectrum efficiency.
Description
Technical field
The invention belongs to fiber optic communications and Wave Guiding Optics field, more particularly, to a kind of optical fiber eigen mode multiplexed communications
Method and system.
Background technique
Along with the advanced IT application of society, higher want is proposed to optical communication system especially backbone optical communication system
It asks, shows as the characteristics such as information capacity is big, transmission range is long, the high communication quality and system reliability are good.According to current development
Speed, the capacity of whole network will at least promote 100 times at following 10 years, and same period Standard single-mode fiber capacity of communication system
Promotion will fall behind network flow speedup an order of magnitude.At the same time, recently as the fast development of mobile Internet, number
It is growing according to measuring, new network operation mode, such as the cloud computing constructed by bulk information technological infrastructure have been expedited the emergence of,
Data center and supercomputer are used among these, and a large amount of data will be by being stored here, being handled and being exchanged.These
Business aggregated data in a manner of unprecedented, so that data volume rapidly increases, there is an urgent need to realize the high-speed light of data center
The high-speed optical interconnection of interconnection and supercomputer.Therefore, how sustainable raising optic communication/optical interconnection system capacity, to answer
To ever-increasing capacity requirement, it has also become optic communication critical issue urgently to be resolved.In fact, all optical communication techniques chase after
Root trace to the source all be around light wave dimension resource be unfolded, the basic dimensions resource of light wave include amplitude, phase, frequency/wavelength, partially
Vibration, time and transverse spatial distribution.The various multiplexing technologies for promoting optical communication capability and advanced advanced modulation technology are exactly to light
The amplitude of wave, phase, frequency/wavelength, polarization and time dimension resource make full use of, but as light wave dimension known to these provides
Source is developed totally, and optic communication starts to show " new size crisis ".In order to further increase the capacity and frequency spectrum of optical communication system
Efficiency, space division multiplexing technology (Space-Division Multiplexing, SDM) at home and abroad attract wide attention.Space division
Multiplexing technology utilizes the Spatial Dimension of light wave, including the mode division multiplexing technology based on less fundamental mode optical fibre, multimode fibre, optical fibre ring etc.
Divide multiplexing technology with the core based on multi-core optical fiber.Mode division multiplexing technology refers to that (space can weigh by different orthogonal intersection space modes
It is folded) as different transmission channels, to realize the technology of spatial reuse.Core divides multiplexing technology to refer to the difference that will be spatially separating
Fibre core (space is not overlapped) is as different transmission channels, to realize the technology of spatial reuse.Similar optic communication development process
Middle this milestone technology of wavelength-division multiplex (multiple wavelength are as multiple transmission channels), space division multiplexing technology is as a kind of new light
Multi-channel multiplexing technology further can effectively promote optical communication capability and spectrum efficiency in fibre.
In the space division multiplexing technology based on optical fiber, currently, the spatial model that most of mode division multiplexing technologies utilize all is
Linear polarization mode (LinearlyPolarized, LP) or orbital angular momentum in less fundamental mode optical fibre, multimode fibre, optical fibre ring etc.
Mode (Orbital Angular Momentum, OAM).In fact, linear polarization mode and orbital angular momentum mode are not light
Fine eigen mode, but the linear superposition of optical fiber eigen mode.In a sense, linear polarization mode, track angular motion
Amount mode, eigen mode, which can be regarded as, is different mode base.Since can use linear polarization mode and orbital angular momentum mode
Realize mode division multiplexing, naturally it is also possible to realize mode division multiplexing using eigen mode.Particularly, the mould of optical fiber eigen mode point is utilized
It is multiplexed more direct.When optical fiber bends, deformation and other disturbance when, the linear polarization mode as made of eigen mode linear superposition
It is easy to be affected with orbital angular momentum mode, in contrast, is directly based upon the multiplexed communications of optical fiber eigen mode with potential excellent
Gesture.In addition, the mode division multiplexing for tradition based on linear polarization mode is needed due to mode crosstalk serious between linear polarization mode
Auxiliary is mostly into having more Digital Signal Processing (Multiple-Input in online polarization mode multiplex communication system
Multiple-Output Digital Signal Processing, MIMO-DSP), this dramatically increases the cost of system and
Complexity, and with the increase sharp increase of model number.For the mode division multiplexing based on orbital angular momentum mode, work as mode
When crosstalk is larger (such as weak lead in less fundamental mode optical fibre and multimode fibre), also need auxiliary in orbital angular momentum multiplex communication system
It helps with MIMO-DSP technology.In consideration of it, being not only directly to carry out using optical fiber eigen mode for optical fiber eigen mode multiplexed communications
Multiplexed communications more wish that system cost and complexity can be reduced by low crosstalk eigen mode multiplexed communications, and realization is not necessarily to
The optical fiber eigen mode multiplex communication system of MIMO-DSP technology.This will realize that optic communication can hold to solve the crisis of optic communication new size
Continuous dilatation provides new approaches and new way.
Summary of the invention
In view of the drawbacks of the prior art, the present invention provides a kind of optical fiber eigen mode multiplexed communications method and system, mesh
Be realize that multichannel optical fiber eigen mode low crosstalk is multiplexed directly using optical fiber eigen mode as data information carrier and lead to
Letter.
Optical fiber eigen mode multiplexed communications method provided by the invention is directly carried using optical fiber eigen mode as data information
The multiple gaussian models of transmitting terminal are converted to optical fiber eigen mode by multichannel eigen mode multiplexer and are multiplexed together by body,
The multimode fibre separated into eigen mode is transmitted, by multichannel eigen mode demultiplexer that multiple optical fiber are intrinsic after transmission
Mode is converted to multiple gaussian models and separates, and is then fed into receiving end and is received.The optical fiber eigen mode multiplexed communications method
Compatible with single mode fiber communications, i.e., multiple gaussian models of transmitting terminal and receiving end match single mode optical fiber.
As an improvement of the above technical solution, after multimode fibre transmission of the above scheme by one section of eigen mode separation,
Since transmission link loss signal is faint, it is unfavorable for receiving end and receives signal.It will by the image intensifer that eigen mode separates
Carry out relaying amplification by multiple optical fiber eigen modes of transmission, then be coupled into the other end eigen mode separation multimode fibre into
Row transmission.
As a further improvement of the foregoing solution, when multimode fibre of the above scheme by the separation of multistage eigen mode transmits,
Relaying amplification is carried out using the image intensifer that multiple eigen modes separate；Every multimode fibre transmission by one section of eigen mode separation,
The corresponding optical amplifier repeaters using an eigen mode separation amplify multiple optical fiber eigen modes, enter back into next section of eigen mode point
From multimode fibre transmission；The multimode fibre of eigen mode separation and the image intensifer of eigen mode separation are used alternatingly.
A kind of optical fiber eigen mode multiplex communication system provided by the invention, including transmitting terminal, multichannel eigen mode multiplexer,
The multimode fibre of eigen mode separation, multichannel eigen mode demultiplexer and receiving end.Transmitting terminal has N number of transmitter, and N is positive whole
Number, provides N number of channel optical signal；Multichannel eigen mode multiplexer has N number of input port and 1 output port, can will be by N number of
N number of channel single mode optical fiber optical signal of input port input is converted to N number of optical fiber eigen mode and efficient multiplexing together by 1
Output port output, N number of input port match single mode optical fiber, can directly dock with single mode optical fiber, N number of input port and transmitting
N number of transmitter is held to be corresponding in turn to connection, the multimode fibre of 1 output port matching eigen mode separation is simultaneously connect with its input terminal；
The multimode fibre of eigen mode separation supports multichannel optical fiber eigen mode, and all optical fiber eigen modes are kept completely separate, optical fiber sheet
Effective refractive index difference is big between sign mode, crosstalk is low；Multichannel eigen mode demultiplexer has 1 input port and N number of output port,
It is single for the N number of channel fiber eigen mode being multiplexed together inputted by 1 input port to be efficiently demultiplexing as N number of channel
Mode fiber optical signal is simultaneously exported by N number of output port, and the multimode fibre of 1 input port matching eigen mode separation is simultaneously exported with it
End connection, N number of output port match single mode optical fiber, can directly dock with single mode optical fiber, N number of output port and receiving end are N number of
Receiver is corresponding in turn to connection；There is N number of receiver in receiving end, detects N number of channel optical signal.
As an improvement of the above scheme, add between the multimode fibre and multichannel eigen mode demultiplexer of eigen mode separation
Enter the image intensifer of eigen mode separation and the multimode fibre of second segment eigen mode separation.The image intensifer of eigen mode separation is for real
The relaying light amplification of existing multichannel optical fiber eigen mode is damaged with the transmission for compensating the multimode fibre by the separation of first segment eigen mode
Consumption, then multichannel optical fiber eigen mode enters the multimode fibre transmission of second segment eigen mode separation.
As a further improvement of the foregoing solution, between multichannel eigen mode multiplexer and multichannel eigen mode demultiplexer
Have a multimode fibre of M+1 sections of eigen modes separation and the image intensifer of M eigen mode separation, M for nonnegative integer (M=0,1,
2 ...), the multimode fibre of eigen mode separation and the image intensifer of eigen mode separation successively alternately connect, each section of eigen mode separation
Multimode fibre be a transmission span, each eigen mode separation image intensifer provide multichannel eigen mode relaying light
It is amplified to compensate for transmission loss.
The invention has the following beneficial effects:
(1) present invention provides a kind of optical fiber eigen mode multiplexed communications method and system, is directly made using optical fiber eigen mode
For data information carrier implementation pattern multiplexed communications, this provides a kind of new thought and approach for fiber optic communication.
(2) compared to traditional single mode fiber communications, optical fiber eigen mode multiplexed communications are intrinsic using multimode fibre multichannel
Mode carries out multiplexed communications, is multiplexed by multichannel eigen mode and parallel transmission, the light that can effectively improve simple optical fiber are logical
Believe capacity and spectrum efficiency, sustainable dilatation is realized, to successfully manage optic communication new size crisis.
(3) mode division multiplexing based on linear polarization mode and orbital angular momentum mode, linear polarization mode and orbital angular momentum mould
Formula is formed by optical fiber eigen mode linear superposition, and in contrast, optical fiber eigen mode multiplexed communications directly utilize optical fiber intrinsic
Mode, thus it is more direct.
(4) mode division multiplexing based on linear polarization mode and orbital angular momentum mode, when optical fiber bends, deformation and other
When disturbance, the linear polarization mode as made of optical fiber eigen mode linear superposition and orbital angular momentum mode are easy to be affected, phase
Than under, the more aobvious advantage of optical fiber eigen mode.
(5) mode division multiplexing based on linear polarization mode and orbital angular momentum mode, since there are crosstalks between mode to need
Auxiliary is in mode multiplexing communication system with MIMO-DSP technology, and this dramatically increases the cost of system and complexities, and with
The increase sharp increase of model number, in contrast, based on the eigen mode multiplexed communications of eigen mode separation multimode fibre, due to more
Channel fiber eigen mode efficiently separates, and effective refractive index difference is big between eigen mode, crosstalk is low, therefore may be implemented to be not necessarily to
The low crosstalk optical fiber eigen mode multiplexed communications of MIMO-DSP technology, are effectively reduced system cost and complexity.
(6) mode division multiplexing based on linear polarization mode and orbital angular momentum mode, multiplex channel number is relatively fewer at present,
In contrast, the eigen mode multiplexed communications based on eigen mode separation multimode fibre, can support more eigen mode port numbers
Mesh, therefore can more effectively improve multiplexed communications capacity and spectrum efficiency.
(7) the optical fiber eigen mode multiplexing technology and the existing fiber communication technology that optical fiber eigen mode multiplexed communications utilize are mutually simultaneous
Hold, for example can combine to come more with the conventional fibre optic communications technology such as advanced advanced modulation formats, wavelength-division multiplex and time division multiplexing
Increase effect and improves communication capacity and spectrum efficiency.Simultaneously as providing single mode optical fiber interface, therefore can be with existing single mode
Docking for multiple single mode fiber communications systems and optical fiber eigen mode multiplex communication system is realized in fusion that optical fiber telecommunications system is seamless.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical fiber eigen mode multiplex communication system provided by the invention.
Fig. 2 is a kind of improvement structural schematic diagram of optical fiber eigen mode multiplex communication system provided by the invention.
Fig. 3 is that the another of optical fiber eigen mode multiplex communication system provided by the invention improves structural schematic diagram.
Fig. 4 is that all -fiber multichannel eigen mode multiplexer conciliates drop multiplexer architecture figure in embodiment.
Fig. 5 is the structural representation of elliptical core multimode fibre and parameter that eigen mode separates in embodiment.(a) a kind of eigen mode
The tomograph and cross section of optic fibre figure of isolated elliptical core multimode fibre.(b) a kind of elliptical core of eigen mode separation
The refractive index profile of multimode fibre.(c) a kind of 6 eigen modes that the elliptical core multimode fibre of eigen mode separation is supported.
Fig. 6 is that different eigen mode effective refractive indexs bore Coefficient m with drawing in elliptical core multimode fibre in embodiment
Variation diagram.
Fig. 7 is the coupling Simulation knot of basic mode eigen mode into elliptical core multimode fibre in single mode optical fiber in embodiment
Fruit.
Fig. 8 is the structural schematic diagram of optical fiber eigen mode multiplex communication system in embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of optical fiber eigen mode multiplexed communications method and system, it is intended to directly be made using optical fiber eigen mode
For data information carrier, the new method for realizing multichannel optical fiber eigen mode low crosstalk multiplexed communications is provided and based on this method
Eigen mode multiplex communication system.Target is to proceed without MIMO-DSP technology using the multichannel eigen mode of multimode fibre
Low crosstalk eigen mode multiplexed communications are separated by constructing and combining multiple transmitters, multichannel eigen mode multiplexer, eigen mode
Multimode fibre, the image intensifer of eigen mode separation, multichannel eigen mode demultiplexer and multiple receivers realization optical fiber eigen mode
Multiplex communication system improves communication capacity and spectrum efficiency, sustainable dilatation is realized, to successfully manage optic communication new size
Crisis.
As shown in Figure 1, a kind of optical fiber eigen mode multiplexed communications method and system provided by the invention.
The present invention provides a kind of optical fiber eigen mode multiplexed communications method, and specific embodiment is as follows:
It is by multichannel eigen mode multiplexer that transmitting terminal is more directly using optical fiber eigen mode as data information carrier
A gaussian model is converted to optical fiber eigen mode and is multiplexed together, and the multimode fibre separated into eigen mode is transmitted, and passes
Multiple optical fiber eigen modes are converted to by multiple gaussian models by multichannel eigen mode demultiplexer after defeated and are separated, are then sent
Enter receiving end to be received.The optical fiber eigen mode multiplexed communications method is compatible with single mode fiber communications, i.e. transmitting terminal and receiving end
Multiple gaussian models match single mode optical fiber.
The present invention provides a kind of optical fiber eigen mode multiplex communication system, and specific embodiment is as follows:
Transmitting terminal 100 has N number of transmitter, and N is positive integer, provides N number of channel optical signal；Multichannel eigen mode multiplexer
200 have N number of input port and 1 output port, the N number of channel single mode optical fiber optical signal that can will be inputted by N number of input port
It is converted to N number of optical fiber eigen mode and efficient multiplexing is exported by 1 output port together, N number of input port matches single-mode optics
Fibre can directly be docked with single mode optical fiber, and N number of input port is corresponding in turn to N number of transmitter in transmitting terminal 100 and connect, and 1 defeated
The multimode fibre 300 of exit port matching eigen mode separation is simultaneously connect with its input terminal；The multimode fibre 300 of eigen mode separation is supported
Multichannel optical fiber eigen mode, and all optical fiber eigen modes are kept completely separate, effectively this dormitory rate is poor greatly between optical fiber eigen mode, goes here and there
It disturbs low；Multichannel eigen mode demultiplexer 400 has 1 input port and N number of output port, can will be defeated by 1 input port
The N number of channel fiber eigen mode being multiplexed together entered is efficiently demultiplexing as N number of channel single mode optical fiber optical signal and by N number of defeated
Exit port output, the multimode fibre 300 of 1 input port matching eigen mode separation are simultaneously connect, N number of output port with its output end
Single mode optical fiber is matched, can directly be docked with single mode optical fiber, N number of output port is corresponding in turn to N number of receiver in receiving end 500
Connection；There is N number of receiver in receiving end 500, detects N number of channel optical signal.
As shown in Fig. 2, a kind of optical fiber eigen mode multiplexed communications improved method provided by the invention and system.
The present invention provides a kind of optical fiber eigen mode multiplexed communications improved method, and specific embodiment is as follows:
After multimode fibre transmission of multiple optical fiber eigen modes by one section of eigen mode separation, since transmission link is lost
Signal is faint, is unfavorable for receiving end and receives signal.The image intensifer separated by eigen mode will be by one section of eigen mode point
From multimode fibre transmission multiple optical fiber eigen modes amplify, then be coupled into another section of eigen mode separation multimode light
Fibre is transmitted.
The present invention also provides a kind of improvement project of optical fiber eigen mode communication system, specific embodiment is as follows:
The system not only includes the transmitting terminal 100 in Fig. 1, multichannel eigen mode multiplexer 200, the multimode of eigen mode separation
Optical fiber 300, multichannel eigen mode demultiplexer 400, receiving end 500, the also multimode fibre 300 and multichannel in eigen mode separation
It joined the image intensifer 600 of eigen mode separation and the multimode light of another section of eigen mode separation between eigen mode demultiplexer 400
Fibre 700.After multimode fibre 300 by the separation of first segment eigen mode transmits, signal is faint, and it is intrinsic to be unfavorable for second segment
The multimode fibre 700 of mould separation continues to transmit.N number of channel gaussian model optical signals that N number of transmitter of transmitting terminal 100 provides
200 efficient multiplexing of multichannel eigen mode multiplexer is N number of channel fiber eigen mode, the multimode separated by first segment eigen mode
N number of channel fiber eigen mode small-signal after optical fiber 300 transmits is passed through in the progress of image intensifer 600 of eigen mode separation
After amplification, the multimode fibre 700 for then entering back into the separation of second segment eigen mode continues to transmit, and it is intrinsic that multichannel is entered back into after transmission
N number of channel fiber eigen mode is efficiently demultiplexing as N number of channel gaussian model signal and separated by mould demultiplexer 400, finally
It is received by N number of receiver of receiving end 500.
As shown in figure 3, another improved method and system of a kind of optical fiber eigen mode multiplexed communications provided by the invention.
The present invention provides a kind of further improvement method of optical fiber eigen mode multiplexed communications, and specific embodiment is as follows:
When multimode fibre of the multiple optical fiber eigen modes of above scheme by the separation of multistage eigen mode transmits, need in repeatedly
After amplification, every multimode fibre transmission by one section of eigen mode separation is corresponded in the image intensifer separated using an eigen mode
After amplifying multiple optical fiber eigen modes, the multimode fibre transmission of next section of eigen mode separation, the multimode of eigen mode separation are entered back into
Optical fiber and the image intensifer of eigen mode separation are used alternatingly.
The present invention also provides a kind of further improvement schemes of optical fiber eigen mode multiplex communication system, and specific embodiment is such as
Under:
There are M+1 sections of eigen mode separation between multichannel eigen mode multiplexer 200 and multichannel eigen mode demultiplexer 400
The image intensifer 600 of multimode fibre 300 and the separation of M eigen mode, M are nonnegative integer (M=0,1,2 ... ...), eigen mode separation
Multimode fibre and eigen mode separation image intensifer successively alternately connect, each section of eigen mode separation multimode fibre be one
Transmission span, the image intensifer of each eigen mode separation provide the relaying light amplification of multichannel eigen mode to compensate transmission damage
Consumption.
A specific embodiment of optical fiber eigen mode multiplex communication system provided by the invention is described below, to illustrate
Optical fiber eigen mode multiplex communication system shown in FIG. 1, wherein the multiplexer and demultiplexer of eigen mode separation are based on fiber orientation
To realize, the multimode fibre of eigen mode separation uses elliptical core multimode fibre for coupling, supports 6 optical fiber eigen modes Embodiment optical fiber eigen mode multiplex communication system is specifically tied
Structure is as follows:
It is all -fiber eigen mode multiplexing demultiplexing device structure chart as shown in Figure 4.It is from left to right multiplexer, from right to left
For demultiplexer.Here it is illustrated with multiplexer.Input port 1,3,5 inputs the gaussian model light letter of the direction x polarization respectively
Number, input port 2,4,6 inputs the gaussian model optical signal of the direction y polarization respectively.The gaussian model optical signal of input port 1,2
It is coupled by the first single mode optical fiber 10 with elliptical core multimode fibre 13 after the first optical fiber polarisation bundling device 7 carries out conjunction beam,
The gaussian model optical signal of input port 3,4 passes through the second single mode optical fiber after the second optical fiber polarisation bundling device 8 carries out conjunction beam
11 couple with elliptical core multimode fibre 13, and the gaussian model optical signal of input port 5,6 passes through third optical fiber polarisation bundling device 9
It is coupled by third single mode optical fiber 12 with elliptical core multimode fibre 13 after carrying out conjunction beam, wherein elliptical core multimode fibre 13 is
From carefully to thick gradual, the gaussian model optical signal after closing beam is effectively rolled in different location and elliptical core multimode fibre 13
Rate matching is penetrated, 6 different optical fiber eigen modes can be excited and remained in final elliptical core multimode fibre 13.This
In, the polarization correlated of fiber orientation coupling is also used, i.e. the gaussian model directional couple excitation fiber of the direction x polarization is intrinsic
ModeThe gaussian model directional couple excitation fiber eigen mode of the direction y polarization
It is the structural representation of elliptical core multimode fibre and parameter of eigen mode separation as shown in Figure 5.(a) more for elliptical core
The tomograph and cross section of optic fibre figure of mode fiber.It (b) is the refractive index profile of elliptical core multimode fibre, horizontal axis indicates
The size of elliptical core fiber, the longitudinal axis indicate refractive index n, and wherein solid line describes the index distribution of transverse a, and dotted line describes ellipse
The index distribution of circle short axle b.(c) the 6 optical fiber eigen modes supported for elliptical core multimode fibre.Subscript table
Show the polarization direction of eigen mode, subscript m, n respectively indicates x, the hot spot number in the direction y.Here, elliptical core multimode fibre institute
It supportsWithEffective refractive index difference be not also it is too big, the optical fiber eigen mode number supported also be not it is very much,
By the way that the structure of panda type stressed zone optical fiber or bow-tie type (being also buttferfly-type) stressed zone optical fiber is designed and elliptical core light
Fine or oval ring core fibre structure design is merged, and may be implemented to support multichannel optical fiber eigen mode, and all
Optical fiber eigen mode is kept completely separate, and effective refractive index difference is big between optical fiber eigen mode, crosstalk is low.
Be as shown in Figure 6 in elliptical core multimode fibre different eigen mode effective refractive indexs with the change for drawing cone Coefficient m
Change figure.Due to basic mode in single mode optical fiber effective refractive index be 1.444389, accordingly figure can obtain different optical fiber eigen modes with
Single mode optical fiber basic mode elliptical core multimode fibre corresponding when matching draws cone coefficient.
It is basic mode LP in single mode optical fiber as shown in Figure 701The coupling of different optical fiber eigen modes into elliptical core multimode fibre
Close simulation result diagram.The single mode optical fiber basic mode and elliptical core multimode fibre eigen mode obtained in scheme and Fig. 6 according to Fig.4,
Matching factor, simulate respectively single mode optical fiber basic mode to 6 optical fiber eigen modes of elliptical core multimode fibre coupling process.
It is the structural schematic diagram of optical fiber eigen mode multiplex communication system in embodiment as shown in Figure 8.6 of transmitting terminal 100
Transmitter respectively by the gaussian model optical signal for carrying different data information send 6 to multichannel eigen mode multiplexer 200 it is defeated
Inbound port, 6 channel fiber eigen modes being multiplexed together after multichannel eigen mode multiplexer 200, by this
After the transmission of elliptical core multimode fibre 300 for levying mould separation, 6 channel fiber eigen modes enter multichannel eigen mode demultiplexing
Device 400 is demultiplexing as 6 channel gaussian models, respectively from 6 output ports of multichannel eigen mode demultiplexer 400 export into
6 receivers for entering receiving end 500 are received, and this completes the optical fiber communicated using optical fiber eigen mode is intrinsic
Mould multiplex communication system.
It is worth noting that, the present invention is not only limited to above-mentioned specific embodiment, persons skilled in the art according to
Present disclosure can implement the present invention using other a variety of specific embodiments, therefore, all using of the invention
Design structure and thinking do the design of some simple variations or change, both fall within the scope of protection of the invention.
Claims (5)
1. a kind of optical fiber eigen mode multiplexed communications method, which is characterized in that directly using optical fiber eigen mode as data information
The multiple gaussian models of transmitting terminal are converted to optical fiber eigen mode by multichannel eigen mode multiplexer and are multiplexed one by carrier
It rises, the multimode fibre separated into eigen mode is transmitted, and passes through multichannel eigen mode demultiplexer after transmission for multiple optical fiber
Eigen mode is converted to multiple gaussian models and separates, and is then fed into receiving end and is received；
The multiple gaussian models of transmitting terminal match single mode optical fiber；
The multiple gaussian models in receiving end match single mode optical fiber.
2. optical fiber eigen mode multiplexed communications method as described in claim 1, which is characterized in that by P+1 sections of eigen mode separation
Multimode fibre transmission when, using P eigen mode separate image intensifer carry out relaying amplification, wherein P be positive integer；Every process
The multimode fibre transmission of one section of eigen mode separation, the corresponding optical amplifier repeaters using an eigen mode separation amplify multiple optical fiber
Eigen mode enters back into the multimode fibre transmission of next section of eigen mode separation；The multimode fibre and eigen mode point of eigen mode separation
From image intensifer be used alternatingly.
3. a kind of optical fiber eigen mode multiplex communication system characterized by comprising sequentially connected transmitting terminal (100), multichannel
Eigen mode multiplexer (200), the multimode fibre (300) of eigen mode separation, multichannel eigen mode demultiplexer (400) and receiving end
(500)；
The transmitting terminal (100) is for providing N number of channel single mode optical fiber optical signal；
The multichannel eigen mode multiplexer (200) has N number of input port and 1 output port, can will be by N number of input terminal
N number of channel single mode optical fiber optical signal of mouth input is converted to N number of optical fiber eigen mode and efficient multiplexing together by 1 output end
Mouth output, N number of input port match single mode optical fiber, can directly dock with single mode optical fiber, N number of input port and transmitting terminal
(100) N number of transmitter is corresponding in turn to connection, and the multimode fibre (300) of 1 output port matching eigen mode separation is simultaneously inputted with it
End connection；
The multimode fibre (300) of the eigen mode separation supports multichannel optical fiber eigen mode, and all optical fiber eigen modes are complete
Fully separating, effective refractive index difference is big between optical fiber eigen mode, crosstalk is low；
The multichannel eigen mode demultiplexer (400) has 1 input port and N number of output port, for that will be inputted by 1
The N number of channel fiber eigen mode of port input being multiplexed together efficiently is demultiplexing as N number of channel single mode optical fiber optical signal simultaneously
It is exported by N number of output port, the multimode fibre (300) of 1 input port matching eigen mode separation is simultaneously connect, N with its output end
A output port matches single mode optical fiber, and N number of output port is corresponding in turn to receiving end (500) N number of receiver and connect；
The receiving end (500) is for detecting N number of channel optical signal；
Wherein, N is positive integer.
4. optical fiber eigen mode multiplex communication system as claimed in claim 3, which is characterized in that the optical fiber eigen mode multiplexing is logical
Letter system further include: the multimode fibre (300) and the multichannel eigen mode demultiplexer of the eigen mode separation are set
(400) multimode fibre (700) that the image intensifer (600) of the eigen mode separation between is separated with eigen mode, the eigen mode point
From image intensifer (600) for realizing the relaying light amplification of multichannel optical fiber eigen mode to compensate by first segment eigen mode
The transmission loss of isolated multimode fibre (300), then multichannel optical fiber eigen mode enters the more of second segment eigen mode separation
Mode fiber (700) transmission.
5. optical fiber eigen mode multiplex communication system as described in claim 3 or 4, which is characterized in that the multichannel eigen mode
The multimode fibre (300) and M for thering are M+1 sections of eigen modes to separate between multiplexer (200) and multichannel eigen mode demultiplexer (400)
The image intensifer (600) of a eigen mode separation, the multimode fibre of eigen mode separation and the image intensifer of eigen mode separation are successively handed over
For connection, the multimode fibre of each section of eigen mode separation is a transmission span, and the image intensifer of each eigen mode separation mentions
For multichannel optical fiber eigen mode relaying light amplification to compensate transmission loss；Wherein M is nonnegative integer.
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