CN108551367A - A kind of Transmission system and method based on mode division multiplexing - Google Patents
A kind of Transmission system and method based on mode division multiplexing Download PDFInfo
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- CN108551367A CN108551367A CN201810166167.3A CN201810166167A CN108551367A CN 108551367 A CN108551367 A CN 108551367A CN 201810166167 A CN201810166167 A CN 201810166167A CN 108551367 A CN108551367 A CN 108551367A
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- signal
- optical signal
- multichannel
- division multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
Abstract
The invention discloses a kind of Transmission system and method based on mode division multiplexing, Transmission system include：Emitter and reception device, wherein emitter include：Signal source provides electric signal at least all the way to transmitter；Electric signal is modulated to and is converted to optical signal on light carrier and optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together by transmitter, generates mode division multiplexing signal.Transmission system and method proposed by the present invention, electric signal is modulated to optical signal by transmitter, and optical signal is divided into the optical signal of multichannel different mode and is multiplexed and generates mode division multiplexing signal, mode division multiplexing signal is transmitted to reception device by optical fiber link, then reception device is demultiplexing as the basic mode optical signal of multichannel model identical, the luminous power of each pattern is reduced to reduce the nonlinear effect of each mode excitation, total nonlinear effect is inhibited, the non-linear tolerance that optical fiber transmission is improved in optical fiber link transmission, improves the transmission quality and distance of signal.
Description
Technical field
The present invention relates to the communications fields, and in particular in a kind of Transmission system and method based on mode division multiplexing.
Background technology
In the prior art, it is generally transmitted using single mode optical fiber, optical fiber transmission is limited to transmission power and optical fiber
It is non-linear.Or be transmitted using less fundamental mode optical fibre, only it is applicable in a kind of higher order mode, the not multiplexing of pattern so that optical signal
To non-linear that tolerance has a certain upgrade in the case of high transmitting power, but still need to further be promoted.
Invention content
Therefore, the present invention in order to solve signal transmission distance in the prior art it is small and only use a kind of higher order mode make it is non-
Linear effect influences transmission quality, provides a kind of Transmission system and method based on mode division multiplexing, improves the transmission quality of signal
And distance.
The embodiment of the present invention provides a kind of transmitting device based on mode division multiplexing, including：Signal source and transmitter,
In, the signal source, for providing electric signal at least all the way to the transmitter；The transmitter is used for the telecommunications
It number is modulated on light carrier and to be converted to optical signal, and the optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed and is existed
Together, mode division multiplexing signal is generated to be transmitted.
Preferably, the signal source is multi-channel electric signal to transmitter offer, and the transmitting device also wraps
It includes：First coupler, for the multi-channel electric signal to be coupled as electric signal output all the way.
Preferably, the transmitter includes：Light source, electrooptic modulator, the second coupler, amplifier, pattern multiplexer,
In, the light source, for providing laser for the electrooptic modulator；The electrooptic modulator, for passing through the laser by institute
The electric signal for stating signal source output is modulated at least optical signal all the way；Second coupler, for will described at least light all the way
Signal is divided into the identical optical signal of multichannel power；The amplifier is more for adjusting the identical optical signal of the multichannel power
The different optical signal of road power；The pattern multiplexer, for the different optical signal of the multichannel power to be converted to multichannel not
With pattern optical signal and be multiplexed together, generate the mode division multiplexing signal.
Preferably, the transmitter further includes：Filter, for filtering out at least out-of-band noise of optical signal all the way.
Preferably, the electric signal that signal source exports is modulated to multipath light signal, the transmitter by the electrooptic modulator
Further include：Wavelength division multiplexer, for the multipath light signal to be multiplexed with optical signal all the way, and optical signal is sent all the way by described in
To second coupler.
The embodiment of the present invention also provides a kind of transmission reception device based on mode division multiplexing, and the reception device receives transmitting
The mode division multiplexing signal of device transmitting, converts the mode division multiplexing signal to the identical basic mode optical signal of multichannel, by delay
After processing, it is converted into electric signal.
Preferably, the reception device includes：Pattern demultiplexer, delayer and photodetector, wherein：The pattern
Demultiplexer, for the mode division multiplexing signal to be demultiplexing as the identical first basic mode optical signal of multichannel；The delayer is used
It, respectively into line delay, generates multichannel the first basic mode light after delay in by the identical first basic mode optical signal of the multichannel and believes
Number；The photodetector, for multichannel the first basic mode optical signal after delay to be converted to electric signal.
Preferably, the reception device further includes：Third coupler is used for first base of multichannel after delay
Mould optical signal is combined into the second basic mode optical signal all the way, and the second basic mode optical signal all the way is sent to the photodetection
Device；The second basic mode optical signal all the way is converted to electric signal by the photodetector.
Preferably, the reception device further includes：Wave decomposing multiplexer, for generating all the way the third coupler
Second basic mode optical signal is demultiplexing as multipath light signal, and the multipath light signal is sent to the photodetector；It is described
The multipath light signal is converted to multi-channel electric signal by photodetector.
The embodiment of the present invention correspondingly provides a kind of Transmission system based on mode division multiplexing, and the system comprises above-mentioned hairs
Injection device and above-mentioned reception device.
The embodiment of the present invention also correspondingly provides a kind of transmission method based on mode division multiplexing, includes the following steps：It obtains
At least electric signal all the way that signal source is sent；Electric signal is modulated on light carrier and is converted at least light all the way all the way by described at least
Signal；Optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together all the way by described at least, generates mode division multiplexing
Signal is transmitted.
Preferably, it is described by it is described at least all the way optical signal be divided into the different pattern of multichannel optical signal and be multiplexed one
It rises, generates mode division multiplexing signal, specifically include：The optical signal is divided into the identical optical signal of multichannel power；To the multichannel
The identical optical signal of power can be adjusted to the optical signal of multichannel different capacity according to the mode signal to be converted；By the multichannel work(
The different optical signal of rate is converted to the optical signal of multichannel different mode and is multiplexed together, and generates the mode division multiplexing signal.
Preferably, by it is described at least all the way electric signal be modulated on light carrier be converted to multipath light signal when, will described in extremely
Few optical signal all the way is divided into the optical signal of the different pattern of multichannel and is multiplexed together, and generates mode division multiplexing signal and is transmitted,
It specifically includes：The multipath light signal is multiplexed with optical signal all the way；Optical signal all the way is divided into the equal light letter of multichannel power
Number；The light letter of multichannel different capacity can be adjusted to according to the mode signal to be converted to the identical optical signal of the multichannel power
Number；The optical signal of the multichannel different capacity is converted to the basic mode optical signal of multichannel different mode, and by multichannel different mode
Basic mode optical signal be multiplexed together, generate the mode division multiplexing signal.
Preferably, after the electric signal at least all the way is modulated at the step of being converted to optical signal on light carrier,
It at least the optical signal of the optical signal pattern that be divided into multichannel different and is multiplexed together described all the way from described, generates mode division multiplexing
Before the step of signal, further include：The optical signal is carried out to filter out out-of-band noise processing.
The embodiment of the present invention also correspondingly provides a kind of transmission method based on mode division multiplexing, includes the following steps：It receives
The mode division multiplexing signal that emitter is sent；It converts the mode division multiplexing signal to the identical basic mode optical signal of multichannel, passes through
After delay process, it is converted into electric signal.
Preferably, described to convert the mode division multiplexing signal to the identical basic mode optical signal of multichannel, by delay process
Afterwards, it is converted into electric signal, is specifically included：The mode division multiplexing signal is demultiplexing as the identical first basic mode optical signal of multichannel；
By the identical first basic mode optical signal of the multichannel into line delay, multichannel the first basic mode optical signal after delay is generated, into
Row transmission；Multichannel the first basic mode optical signal after delay is converted into electric signal.
Preferably, the identical first basic mode optical signal of the multichannel into line delay, is being generated into the multichannel after delay
After the step of first basic mode optical signal is transmitted, further include：By multichannel the first basic mode optical signal after delay
It is coupled as the second basic mode optical signal all the way；The second basic mode optical signal all the way is converted into electric signal.
Preferably, after the described the step of multichannel the first basic mode optical signal is combined into the second basic mode optical signal all the way,
Further include：The second basic mode optical signal all the way is demultiplexing as multipath light signal；The multipath light signal is converted into telecommunications
Number.A kind of Transmission system based on mode division multiplexing, including：Signal source, transmitter and optical fiber link, wherein the signal source is used
In the electric signal to transmitter offer at least all the way；The transmitter, for the electric signal to be modulated to light carrier
Optical signal is converted to, and the optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together, it is multiple to generate mould point
Use signal；The optical fiber link is used for transmission the mode division multiplexing signal.
Preferably, the above-mentioned Transmission system based on mode division multiplexing further includes：Receiver, for believing the mode division multiplexing
Number be converted into the identical basic mode optical signal of multichannel is then converted to electric signal after delay process.
Preferably, the signal source is multi-channel electric signal to transmitter offer, and the fibre-optic transmission system (FOTS) also wraps
It includes：First coupler, for the multi-channel electric signal to be coupled as electric signal output all the way.
Preferably, the transmitter includes：Light source, electrooptic modulator, the second coupler, amplifier, pattern multiplexer,
In, the light source, for providing laser for the electrooptic modulator；The electrooptic modulator, for passing through the laser by institute
The electric signal for stating signal source output is modulated at least optical signal all the way；Second coupler, for will described at least light all the way
Signal is divided into the identical optical signal of multichannel power；The amplifier is more for adjusting the identical optical signal of the multichannel power
The different optical signal of road power；The pattern multiplexer, for the different optical signal of the multichannel power to be converted to multichannel not
With pattern optical signal and be multiplexed together, generate the mode division multiplexing signal.
Preferably, the transmitter further includes：Filter, for filtering out at least out-of-band noise of optical signal all the way.
Technical solution of the present invention has the following advantages that：
The present invention proposes a kind of Transmission system and method based on mode division multiplexing, and the electric signal that signal source provides is modulated to
Optical signal, and optical signal is divided into the optical signal of multichannel different mode, it is each to reduce to reduce the luminous power of each pattern
The nonlinear effect of mode excitation, while making non-linear relatively low between pattern, so total nonlinear effect is inhibited, improve
The transmission quality and distance of signal.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is a specific example of the transmitting device based on mode division multiplexing provided in the embodiment of the present invention 1
Frame composition figure；
Fig. 2 is the specific stream of transmitting device corresponding method one based on mode division multiplexing that the embodiment of the present invention 1 provides
Cheng Tu；
Fig. 3 is the frame set of one specific example of Transmission system based on mode division multiplexing provided in the embodiment of the present invention 2
Cheng Tu；
Fig. 4 is the principle composition of one specific example of Transmission system based on mode division multiplexing that the embodiment of the present invention 2 provides
Figure；
Fig. 5 is one particular flow sheet of Transmission system corresponding method based on mode division multiplexing that the embodiment of the present invention 2 provides；
Fig. 6 is the principle composition of one specific example of Transmission system based on mode division multiplexing that the embodiment of the present invention 3 provides
Figure；
Fig. 7 is one detailed process of Transmission system corresponding method based on mode division multiplexing provided in the embodiment of the present invention 3
Figure；
Fig. 8 is the principle composition of one specific example of Transmission system based on mode division multiplexing that the embodiment of the present invention 4 provides
Figure；
Fig. 9 is one detailed process of Transmission system corresponding method based on mode division multiplexing provided in the embodiment of the present invention 4
Figure.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of transmitting device based on mode division multiplexing, can be applied to radar return signal
Optical transport accesses between net, data center, short haul connection in data center, as shown in Figure 1, including：Signal source 1, transmitter 2,
Wherein, signal source 1, for providing electric signal at least all the way to transmitter 2；Transmitter 2 is carried for electric signal to be modulated to light
Optical signal is converted on wave, and optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together, and it is multiple to generate mould point
Use signal.It is that mode division multiplexing signal is transmitted by optical fiber link 3 in the embodiment of the present invention, specifically, less fundamental mode optical fibre can be used to make
For the optical fiber link 3.
The electric signal that signal source provides is divided into the different pattern of multichannel by the above-mentioned transmitting device based on mode division multiplexing
Optical signal and be multiplexed together, generate mode division multiplexing signal, promote the non-linear tolerance of fibre system, improve transmission matter
Amount.
The biography based on mode division multiplexing corresponding with the transmitting device provided in an embodiment of the present invention based on mode division multiplexing
Transmission method, as shown in Fig. 2, including the following steps：
Step S11：It obtains signal source and electric signal all the way is provided.
In the embodiment of the present invention, the electric signal that signal source provides is microwave telecommunication number.
Step S12：Electric signal is modulated on light carrier and is converted to optical signal.
In the embodiment of the present invention, increasing Dare modulators modulate by Mach will be on microwave telecommunication number to light carrier.
Step S13：Optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together, mode division multiplexing letter is generated
It number is transmitted.
In the embodiment of the present invention, the mode division multiplexing signal of generation is passed to less fundamental mode optical fibre and carries out signal transmission.
Embodiment 2
The embodiment of the present invention provides a kind of fibre-optic transmission system (FOTS) based on mode division multiplexing, including：Emitter and reception fill
It sets, wherein emitter, as shown in figure 3, including：Signal source 1 and transmitter 2, wherein signal source 1, for being carried to transmitter 2
For electric signal at least all the way；Transmitter 2 is converted to optical signal for electric signal to be modulated on light carrier, and by optical signal
It is divided into the optical signal of the different pattern of multichannel and is multiplexed together, generates mode division multiplexing signal.Pass through light in the embodiment of the present invention
Fine link 3 transmits mode division multiplexing signal.Reception device is a receiver 4, identical for converting mode division multiplexing signal to multichannel
Basic mode optical signal be then converted to electric signal after delay process, the electric signal can by radio communication base station, personal use
Family end or data center receive.
In a preferred embodiment, when signal source 1 to transmitter 2 offer be multi-channel electric signal when, as shown in figure 4, pass
Defeated system further includes：First coupler 5, for multi-channel electric signal to be coupled as electric signal output all the way.In the embodiment of the present invention
In, signal source 1 includes the first signal source and second signal source provides 18G and 18.1G two-way microwave telecommunications number, but the present invention respectively
It is not limited thereto, which also may include 2 or more signal sources.
In a preferred embodiment, as shown in figure 4, the transmitter 2 includes：Light source 21, electrooptic modulator 22, filter
26, the second coupler 23, amplifier 24, pattern multiplexer 25, wherein light source 21, for providing laser for electrooptic modulator 22；
Electrooptic modulator 22, for the electric signal that signal source 1 exports to be modulated at least optical signal all the way by laser；Filter 26,
For filtering out at least out-of-band noise of optical signal all the way.Second coupler 23, for will at least optical signal is divided into multichannel work(all the way
The identical optical signal of rate；Amplifier 24 is the different optical signal of multichannel power for adjusting the identical optical signal of multichannel power；Mould
Formula multiplexer 25, for the different optical signal of multichannel power to be converted to the optical signal of multichannel different mode and is multiplexed together,
Generate mode division multiplexing signal.
In the embodiment of the present invention, the electric signal that signal source 1 exports is modulated to light all the way by electrooptic modulator 22 by laser
Signal；Second coupler 23 will be divided into the identical optical signal of two-way power, the information carried in two ways of optical signals by optical signal all the way
Equally；It is the different optical signal of two-way power that amplifier 24, which adjusts the identical optical signal of two-way power,；Pattern multiplexer 25 is by two
Power different optical signal in road is converted to the optical signal of two-way different mode, respectively LP11 patterns and LP01 patterns, then will
The optical signal of two-way different mode is simultaneously multiplexed together, and generates mode division multiplexing signal.
In a preferred embodiment, as shown in figure 4, the receiver 4 includes：Pattern demultiplexer 41, delayer 42 and light
Electric explorer 43, wherein：Pattern demultiplexer 41, for mode division multiplexing signal to be demultiplexing as the identical first basic mode light of multichannel
Signal；Delayer 42, for the identical first base optical mode signal of multichannel respectively into line delay, to be generated the multichannel after delay
First basic mode optical signal；Photodetector 43, for multichannel the first basic mode optical signal after delay to be converted to electric signal.
In the embodiment of the present invention, mode division multiplexing signal is demultiplexing as identical first base of two-way by pattern demultiplexer 41
Mould optical signal, the first basic mode optical signal is LP01 signals in the embodiment of the present invention；Delayer 42, by identical first basic mode of two-way
Optical signal generates two-way the first basic mode optical signal after delay respectively into line delay, will wherein one in the embodiment of the present invention
Road the first basic mode optical signal makes phase bit flipping 180 degree by delayer；Photodetector 43, being used for will be by the two-way after delay
First basic mode optical signal is converted to electric signal.Photodetector 43 in the embodiment of the present invention can be balance photodetector.
The electric signal that signal source provides, is divided into the light of the different pattern of multichannel by the above-mentioned Transmission system based on mode division multiplexing
Signal is simultaneously multiplexed together, and generates mode division multiplexing signal, and then converting mode division multiplexing signal to the identical basic mode light of multichannel believes
Number promoted fibre system non-linear tolerance, improve transmission quality.The non-linear tolerance of optical fiber transmission is promoted, letter is improved
Number transmission quality and distance.
The transmission side based on mode division multiplexing corresponding with the Transmission system provided in an embodiment of the present invention based on mode division multiplexing
Method, as shown in figure 5, including the following steps：
Step S21：The two-way microwave telecommunication number of the first signal source and the offer of second signal source is obtained, and two-way microwave is electric
Signal is coupled, and generates the electric signal after coupling.
In the embodiment of the present invention, the first signal source and second signal source provide 18G and 18.1G two-way microwave telecommunications respectively
Number.
Step S22：Electric signal after coupling is modulated on light carrier and is converted to optical signal.
Step S23：Optical signal is carried out to filter out out-of-band noise processing.
Step S24：The optical signal after out-of-band noise will be filtered out and be divided into the identical optical signal of two-way power.
Step S25：Two-way difference work(can be adjusted to according to the mode signal to be converted to the identical optical signal of two-way power
The optical signal of rate.
Step S26：By wherein basic mode optical signal is converted to the optical signal of one mode all the way, another way is converted to another kind
The optical signal of pattern, and the optical signal of two-way different mode is multiplexed together, it generates mode division multiplexing signal and is passed to less fundamental mode optical fibre.
In the embodiment of the present invention, will wherein basic mode optical signal is converted to LP11 mode signals all the way, another way remains
LP01 basic mode optical signals.
Step S27：Mode division multiplexing signal is divided into the identical basic mode optical signal of two-way.
In the embodiment of the present invention, mode division multiplexing signal is divided into the identical basic mode LP01 signals of two-way.
Step S28：Will wherein all the way basic mode optical signal carry out delay process.
In the embodiment of the present invention, by the wherein phase bit flipping 180 degree of basic mode optical signal all the way.
Step S29：Two-way basic mode optical signal is converted into electric signal.
Embodiment 3
The embodiment of the present invention provides a kind of Transmission system based on mode division multiplexing, including：Signal source 1, the first coupler 5,
Transmitter 2, optical fiber link 3 and receiver 4, wherein signal source 1, for providing two path signal to transmitter 2；First coupling
The two path signal that signal source provides is combined into electric signal all the way by device 5；Transmitter 2, for electric signal to be modulated to light carrier
Optical signal is converted to, and optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together, generates mode division multiplexing letter
Number；Optical fiber link 3 is used for transmission mode division multiplexing signal；Receiver 4, it is identical for converting mode division multiplexing signal to multichannel
Basic mode optical signal is then converted to electric signal after delay process, which can be by radio communication base station, personal user
End or data center receive.
In the embodiment of the present invention, as shown in fig. 6, the transmitter 2 includes：Light source 21, electrooptic modulator 22, filter 26,
Second coupler 23, amplifier 24, pattern multiplexer 25, wherein：Light source 21, for providing laser for electrooptic modulator 22；Light
Electric modulator 22, for the electric signal that signal source 1 exports to be modulated to optical signal all the way by laser；Filter 26, for filtering
Except the out-of-band noise of optical signal all the way；Second coupler 23, for N (N=2 will to be divided by optical signal all the wayn, wherein n be not less than
2 natural number) the identical optical signal of road power, the information carried on the optical signal of the roads N is the same；Amplifier 24, for adjusting the roads N work(
The identical optical signal of rate is the different optical signal of the roads N power；Pattern multiplexer 25, for turning the different optical signal of the roads N power
It is changed to the optical signal of the roads N different mode and is multiplexed together, generate mode division multiplexing signal.In the embodiment of the present invention, mode multiplexing
Power different optical signal in the roads N is converted to the optical signal of the roads N different mode, then by the optical signal of the roads N different mode by device 25
And be multiplexed together, generate mode division multiplexing signal.
In embodiments of the present invention, as shown in fig. 6, receiver 4 includes：Pattern demultiplexer 41, delayer 42, third coupling
Clutch 44 and photodetector 43, wherein：Mode division multiplexing signal is demultiplexing as the roads N identical first by pattern demultiplexer 41
Basic mode optical signal, the first basic mode optical signal is LP01 signals in the embodiment of the present invention；Delayer 42, by identical first base in the roads N
Mould optical signal generates the first basic mode of the roads N after delay into line delay to realize that the time delay between the signal of the roads N is aligned respectively
Optical signal；Third coupler 44, for the roads N the first basic mode optical signal after delay to be combined into the second basic mode light letter all the way
Number, and photodetector 43 will be sent to by the second basic mode optical signal all the way；Photodetector 43 will the second basic mode optical signal all the way
Be converted to electric signal, in the embodiment of the present invention, photodetector 43 is single-ended photodetector.
It is provided by the invention to be answered the multi-channel electric signal that signal source provides by pattern based on the Transmission system of mode division multiplexing
It is modulated to the optical signal of different mode with device, electric signal is then demultiplexing as multichannel basic mode optical signal with pattern demultiplexer,
By being combined into electric signal output all the way eventually by single-ended detector after delay process, the non-linear tolerance of optical fiber transmission is improved
Property, improve the transmission quality and distance of signal.
The transmission side based on mode division multiplexing corresponding with the Transmission system provided in an embodiment of the present invention based on mode division multiplexing
Method, as shown in fig. 7, comprises following steps：
Step S31：The two-way microwave telecommunication number of the first signal source and the offer of second signal source is obtained, and two-way microwave is electric
Signal is coupled, and generates the electric signal after coupling.
In the embodiment of the present invention, the first signal source and second signal source provide 18G and 18.1G two-way microwave telecommunications respectively
Number.
Step S32：Electric signal after coupling is modulated on light carrier and is converted to optical signal.
Step S33：Optical signal is carried out to filter out out-of-band noise processing.
Step S34：The optical signal after out-of-band noise will be filtered out and be divided into the identical optical signal of the roads N power.
Step S35：The roads N different capacity can be adjusted to according to the mode signal to be converted to the identical optical signal of the roads N power
Optical signal.
Step S36：The optical signal of the roads N different capacity is converted to the optical signal of the roads N different mode, and by the roads N difference mould
The optical signal of formula is multiplexed together, and is generated mode division multiplexing signal and is passed to less fundamental mode optical fibre.
Step S37：Mode division multiplexing signal is divided into the identical first basic mode optical signal in the roads N.
In the embodiment of the present invention, mode division multiplexing signal is divided into the identical basic mode LP01 signals in the roads N.
Step S38：To N roadbed moulds optical signal respectively into line delay, to realize that the time delay between the optical signal of the roads N is aligned.
Step S39：The roads N optical signal Jing Guo delay process is coupled as the second basic mode optical signal all the way.
Step S40：Second basic mode optical signal is converted into electric signal.
Embodiment 4
The embodiment of the present invention provides a kind of Transmission system based on mode division multiplexing, including：Signal source 1, transmitter 2, optical fiber
Link 3 and receiver 4, wherein signal source 1, for providing electric signal all the way to transmitter 2；Transmitter 2 is used for telecommunications
It number is modulated on light carrier and to be converted to optical signal, and optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed one
It rises, generates mode division multiplexing signal；Optical fiber link 3 is used for transmission mode division multiplexing signal；Receiver 4 is used for mode division multiplexing signal
It is converted into the identical basic mode optical signal of multichannel and is then converted to electric signal after delay process, which can be by channel radio
Believe that base station, personal user end or data center receive.
In the embodiment of the present invention, as shown in figure 8, signal source 1 provides the roads M electric signal, transmitter 2 includes：Light source 21, photoelectricity
Modulator 22, filter 26, wavelength division multiplexer 27, the second coupler 23, amplifier 24, pattern multiplexer 25, wherein：Light source
21, optical modulator 22, the number of filter 26 are corresponding with the electric signal way that signal source provides, and are all M respectively.Light source 21,
For providing laser for electrooptic modulator 22；Electrooptic modulator 22, the roads the M electric signal for being exported signal source 1 by laser
It is modulated to M (M is the natural number not less than 2) road optical signal, the roads M are the optical signal of different wave length；Filter 26, for filtering out M
The out-of-band noise of road optical signal；Wavelength division multiplexer 27 for the roads M optical signal to be multiplexed with optical signal all the way, and will be believed light all the way
Number it is sent to the second coupler 23；Second coupler 23, for N (N=2 will to be divided by optical signal all the wayn, wherein n is not less than 2
Natural number) the identical optical signal of road power, the information carried on the optical signal of the roads N is the same；Amplifier 24, for adjusting the roads N work(
The identical optical signal of rate is the different optical signal of road power；Pattern multiplexer 25, for converting the different optical signal of the roads N power
For the roads N different mode optical signal and be multiplexed together, generate mode division multiplexing signal.
In the embodiment of the present invention, as shown in figure 8, receiver 4 includes：Pattern demultiplexer 41, delayer 42, third coupling
Device 44, Wave decomposing multiplexer 45 and photodetector 43, wherein：Mode division multiplexing signal is demultiplexing as N by pattern demultiplexer 41
The identical first basic mode optical signal in road；Delayer 42, by the identical first basic mode optical signal in the roads N respectively into line delay, to realize N
Time delay alignment between the signal of road, generates the roads N the first basic mode optical signal after delay；Third coupler 44, for will be through
The roads N the first basic mode optical signal crossed after delay is combined into the second basic mode optical signal all the way, and the second basic mode optical signal will send all the way
To Wave decomposing multiplexer 45, Wave decomposing multiplexer 45, the second basic mode optical signal solution all the way for generating third coupler 44
It is multiplexed with the roads M optical signal, and the roads M optical signal is sent to photodetector 43；Photodetector 43 is converted to the roads M optical signal
The roads M electric signal, in the embodiment of the present invention, photodetector 43 is single-ended photodetector.
The embodiment of the present invention can be answered the multipath light signal that electrooptic modulator is modulated by wavelength division multiplexer in transmitter
With together, different number of multipath light signal is further divided by the second coupler, is then converted to the light of different pattern
Signal is simultaneously multiplexed together, and the optical signal of model identical is divided into after demultiplexing, passes through third coupling after delay process
Clutch and Wave decomposing multiplexer are divided into multi-channel electric signal and are exported, and improve the non-linear tolerance of optical fiber transmission, improve letter
Number transmission quality and distance.
The transmission side based on mode division multiplexing corresponding with the Transmission system provided in an embodiment of the present invention based on mode division multiplexing
Method, as shown in figure 9, including the following steps：
Step S41：Obtain the roads the M electric signal that signal source provides.
Step S42：Electric signal is modulated to the optical signal that the roads M different wave length is converted on light carrier.
Step S43：The roads M optical signal is carried out to filter out out-of-band noise processing.
Step S44：The roads the M optical signal after out-of-band noise will be filtered out and be multiplexed with optical signal all the way.
Step S45：The identical optical signal of the roads N power will be divided by optical signal all the way.
Step S46：The roads N different capacity can be adjusted to according to the mode signal to be converted to the identical optical signal of the roads N power
Optical signal.
Step S47：The optical signal of the roads N different capacity is converted to the optical signal of the roads N different mode, and by the roads N difference mould
The optical signal of formula is multiplexed together, and is generated mode division multiplexing signal and is passed to less fundamental mode optical fibre.
Step S48：Mode division multiplexing signal is divided into the identical first basic mode optical signal in the roads N.
Step S49：The identical first basic mode optical signal in the roads N respectively into line delay, with realize the roads N the first basic mode optical signal it
Between time delay alignment.
Step S50：The roads N the first basic mode optical signal Jing Guo delay process is coupled as the second basic mode optical signal all the way.
Step S51：The roads M optical signal will be demultiplexing as by the second basic mode optical signal all the way, and the roads M optical signal is converted into telecommunications
Number.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (18)
1. a kind of transmitting device based on mode division multiplexing, which is characterized in that including：Signal source and transmitter, wherein
The signal source, for providing electric signal at least all the way to the transmitter；
The transmitter is converted to optical signal for the electric signal to be modulated on light carrier, and the optical signal is divided into
The optical signal of the different pattern of multichannel is simultaneously multiplexed together, and is generated mode division multiplexing signal and is transmitted.
2. the transmitting device according to claim 1 based on mode division multiplexing, which is characterized in that the signal source is to institute
It is multi-channel electric signal to state transmitter offer,
The transmitting device further includes：First coupler, it is defeated for the multi-channel electric signal to be coupled as electric signal all the way
Go out.
3. the transmitting device according to claim 1 based on mode division multiplexing, which is characterized in that the transmitter packet
It includes：Light source, electrooptic modulator, the second coupler, amplifier, pattern multiplexer, wherein
The light source, for providing laser for the electrooptic modulator；
The electrooptic modulator, for being modulated to the electric signal that the signal source exports at least by the laser, light is believed all the way
Number；
Second coupler, for optical signal to be divided into the identical optical signal of multichannel power all the way by described at least；
The amplifier is the different optical signal of multichannel power for adjusting the identical optical signal of the multichannel power；
The pattern multiplexer, for the different optical signal of the multichannel power to be converted to the optical signal of multichannel different mode simultaneously
It is multiplexed together, generates the mode division multiplexing signal.
4. the transmitting device according to claim 3 based on mode division multiplexing, which is characterized in that the transmitter also wraps
It includes：Filter, for filtering out at least out-of-band noise of optical signal all the way.
5. the transmitting device according to claim 3 based on mode division multiplexing, which is characterized in that the electrooptic modulator
The electric signal that signal source exports is modulated to multipath light signal, the transmitter further includes：Wavelength division multiplexer, being used for will be described more
Road optical signal is multiplexed with optical signal all the way, and the optical signal all the way is sent to second coupler.
6. a kind of transmission reception device based on mode division multiplexing, which is characterized in that the reception device receiving and transmitting unit transmitting
Mode division multiplexing signal, convert the mode division multiplexing signal to the identical basic mode optical signal of multichannel, after delay process, turn
Turn to electric signal.
7. the transmission reception device according to claim 6 based on mode division multiplexing, which is characterized in that the reception device packet
It includes：Pattern demultiplexer, delayer and photodetector, wherein：
The pattern demultiplexer, for the mode division multiplexing signal to be demultiplexing as the identical first basic mode optical signal of multichannel；
The delayer, for respectively into line delay, generating the identical first basic mode optical signal of the multichannel after delay
Multichannel the first basic mode optical signal；
The photodetector, for multichannel the first basic mode optical signal after delay to be converted to electric signal.
8. the transmission reception device according to claim 7 based on mode division multiplexing, which is characterized in that the reception device is also
Including：Third coupler, for multichannel the first basic mode optical signal after delay to be combined into the second basic mode light letter all the way
Number, and the second basic mode optical signal all the way is sent to the photodetector；
The second basic mode optical signal all the way is converted to electric signal by the photodetector.
9. the transmission reception device according to claim 8 based on mode division multiplexing, which is characterized in that the reception device is also
Including：Wave decomposing multiplexer, the second basic mode optical signal all the way for generating the third coupler are demultiplexing as multichannel light
Signal, and the multipath light signal is sent to the photodetector；
The multipath light signal is converted to multi-channel electric signal by the photodetector.
10. a kind of Transmission system based on mode division multiplexing, which is characterized in that the system comprises any in such as claim 1-5
Emitter described in and the reception device as described in any one of claim 6-9.
11. a kind of transmission method based on mode division multiplexing, which is characterized in that include the following steps：
Obtain at least electric signal all the way that signal source is sent；
Electric signal is modulated on light carrier and is converted at least optical signal all the way all the way by described at least；
Optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together all the way by described at least, generates mode division multiplexing letter
It number is transmitted.
12. the transmission method according to claim 11 based on mode division multiplexing, which is characterized in that described at least one by described in
Road optical signal is divided into the optical signal of the different pattern of multichannel and is multiplexed together, and generates mode division multiplexing signal, specifically includes：
The optical signal is divided into the identical optical signal of multichannel power；
The light letter of multichannel different capacity can be adjusted to according to the mode signal to be converted to the identical optical signal of the multichannel power
Number；
The different optical signal of the multichannel power is converted into the optical signal of multichannel different mode and is multiplexed together, described in generation
Mode division multiplexing signal.
13. the transmission method according to claim 11 based on mode division multiplexing, which is characterized in that at least electric all the way by described in
For signal modulation when being converted to multipath light signal on light carrier, optical signal is divided into the different pattern of multichannel all the way by described at least
Optical signal is simultaneously multiplexed together, and is generated mode division multiplexing signal and is transmitted, specifically includes：
The multipath light signal is multiplexed with optical signal all the way；
Optical signal all the way is divided into the equal optical signal of multichannel power；
The light letter of multichannel different capacity can be adjusted to according to the mode signal to be converted to the identical optical signal of the multichannel power
Number；
The optical signal of the multichannel different capacity is converted to the basic mode optical signal of multichannel different mode, and by multichannel different mode
Basic mode optical signal be multiplexed together, generate the mode division multiplexing signal.
14. the transmission method according to claim 11 based on mode division multiplexing, which is characterized in that described in inciting somebody to action at least all the way
Electric signal be modulated on light carrier after the step of being converted to optical signal, with it is described by it is described at least all the way optical signal be divided into it is more
Before the step of optical signal of the different pattern in road is simultaneously multiplexed together, generation mode division multiplexing signal, further include：
The optical signal is carried out to filter out out-of-band noise processing.
15. a kind of transmission method based on mode division multiplexing, which is characterized in that include the following steps：
The mode division multiplexing signal that receiving and transmitting unit is sent；
It converts the mode division multiplexing signal to the identical basic mode optical signal of multichannel and is converted into electric signal after delay process.
16. the transmission method according to claim 15 based on mode division multiplexing, which is characterized in that described that the mould point is multiple
It is converted into the identical basic mode optical signal of multichannel with signal and is converted into electric signal after delay process, specifically includes：
The mode division multiplexing signal is demultiplexing as the identical first basic mode optical signal of multichannel；
By the identical first basic mode optical signal of the multichannel into line delay, the letter of multichannel the first basic mode light after delay is generated
Number, it is transmitted；
Multichannel the first basic mode optical signal after delay is converted into electric signal.
17. the transmission method according to claim 16 based on mode division multiplexing, which is characterized in that the multichannel is identical
The first basic mode optical signal into line delay, generate the step of multichannel the first basic mode optical signal after delay is transmitted it
Afterwards, further include：
Multichannel the first basic mode optical signal after delay is coupled as the second basic mode optical signal all the way；
The second basic mode optical signal all the way is converted into electric signal.
18. the transmission method according to claim 17 based on mode division multiplexing, which is characterized in that described by the multichannel
One basic mode optical signal was combined into after the step of the second basic mode optical signal all the way, further included：Will described in the second basic mode optical signal all the way
It is demultiplexing as multipath light signal；
The multipath light signal is converted into electric signal.
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