CN106788773A - A kind of coherent reception system and method based on photon lantern - Google Patents
A kind of coherent reception system and method based on photon lantern Download PDFInfo
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- CN106788773A CN106788773A CN201710029144.3A CN201710029144A CN106788773A CN 106788773 A CN106788773 A CN 106788773A CN 201710029144 A CN201710029144 A CN 201710029144A CN 106788773 A CN106788773 A CN 106788773A
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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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
- H04B10/2581—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
- H04B10/70—Photonic quantum communication
Abstract
A kind of coherent reception system based on photon lantern and method are the embodiment of the invention provides, the system includes：Reception antenna, photon lantern, coherent receiver：The reception antenna, for receiving free space optical, the free space optical is coupled；The photon lantern, for receiving the free space optical after coupling, is converted into multichannel single mode optical signal, and transmit the multichannel single mode optical signal by the free space optical after the coupling；The coherent receiver, for receiving the multichannel single mode optical signal, relevant combining is carried out by the multichannel single mode optical signal, obtains optical signal all the way.Coherent reception system and method based on photon lantern provided in an embodiment of the present invention can improve the coupling efficiency of spatial light, coherent reception when can realize that various modes mix again.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of coherent reception system and side based on photon lantern
Method.
Background technology
Space Optical Communication Technologies, compared to traditional wireless communication technology, with two aspect advantages, one is strong security,
Only on the straight line of beam propagation, information can just be trapped；Two is big spectral range, and bandwidth resources are enriched, and need not move through and award
Weighing can be to use.Space Optical Communication Technologies are in satellite Wide Band Data transmission, military security communications and liaison, air traffic control and network
The fields such as seamless coverage have a extensive future.Communication quality is the research emphasis of Space Optical Communication Technologies, atmospheric interference effect
The power of optical signal and phase can be made to produce distortion, cause communication quality to decline, wherein turbulent atmosphere can cause laser light occur
Beam drift, extension, influence light beam coupling so that light beam smoothly cannot be coupled into optical fiber, and each pattern in light beam also cannot
By diversity reception, so as to reliable communication cannot be realized.
For the influence that the turbulent atmosphere in atmospheric interference effect is produced to optical signal, in order to improve under turbulent-flow conditions freely
Spatial light and improves space optical communication coherent reception performance to the coupling efficiency of single-mode fiber, and prior art is using based on single
The coherent reception method of road coupling, improves spatial light to the coupling efficiency of single-mode fiber, generally using single mode using number of ways
Optical fiber and multimode fibre.Single-mode fiber can only receive the optical signal of single-mode, and the single-mode optical signal that will be received is passed
Coherent receiver is defeated by, for single mode optical signal, coherent receiver is easily achieved efficient coherent reception, but single-mode fiber
Core diameter is too small, and under strong turbulence air, the coupling efficiency of light is low；During using multimode fibre coherent reception, the core diameter of multimode fibre is big,
Under strong turbulence air, coupling efficiency is higher, but the pattern of multimode fibre output light include multimode optical signal, few mould optical signal,
Single mode optical signal, pattern mix, and coherent receiver is difficult to the relevant of single mode optical signal to the optical signal that various modes mix
Receive.
To sum up, the method for reseptance based on single channel coupling cannot simultaneously improve the coupling efficiency of free space optical under turbulent-flow conditions
With space optical communication coherent reception performance.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of coherent reception system and method based on photon lantern, by drawing
Enter photon lantern, be the single mode optical signal of multichannel by the light output of multiple patterns, to realize under turbulent-flow conditions, sky can be improved
Between light coupling efficiency, coherent reception when can realize that various modes mix again.Concrete technical scheme is as follows：
To reach above-mentioned purpose, in a first aspect, the invention provides a kind of coherent reception system based on photon lantern, bag
Include：Reception antenna, photon lantern, coherent receiver：
The reception antenna, for receiving free space optical, the free space optical is coupled；
The photon lantern, for receiving the free space optical after coupling, by the free space optical conversion after the coupling
Into multichannel single mode optical signal, and transmit the multichannel single mode optical signal；
The coherent receiver, for receiving the multichannel single mode optical signal, phase is carried out by the multichannel single mode optical signal
Dry combining, obtains optical signal all the way.
The reception antenna includes：Coupled lens, for the free space optical to be coupled.
The photon lantern, specifically for the various modes light in the free space optical after the coupling is converted into multichannel
Single mode optical signal.
The coherent receiver, specifically for by the multichannel single mode optical signal carry out successively relevant mixing, balance reception,
Digital-to-analogue conversion, Digital Signal Processing treatment.
Second aspect, present invention also offers a kind of coherent reception method based on photon lantern, is applied to as described above
The coherent reception system based on photon lantern, methods described includes：
Reception antenna receives free space optical, and the free space optical is coupled；
Photon lantern receives the free space optical after coupling, and the free space optical after the coupling is converted into multichannel single mode
Optical signal, and transmit the multichannel single mode optical signal；
Coherent receiver receives the multichannel single mode optical signal, and the multichannel single mode optical signal is realized into relevant combining, obtains
To optical signal all the way.
It is described to be coupled the free space optical, including：The free space optical is coupled by coupled lens.
The photon lantern, multichannel single mode optical signal is converted into by the free space optical after the coupling, including：Will be described
Various modes light in free space optical after coupling is converted into multichannel single mode optical signal.
The coherent receiver is received after the multichannel single mode optical signal, and methods described includes：By the multichannel single mode
Optical signal carries out relevant mixing, balance reception, digital-to-analogue conversion, Digital Signal Processing treatment successively.
Coherent reception system and method based on photon lantern provided in an embodiment of the present invention, by introducing photon lantern,
It is the single mode optical signal of multichannel by the light output of multiple patterns, to realize under turbulent-flow conditions, the coupling of spatial light can be improved
Efficiency, coherent reception when can realize that various modes mix again.Certainly, implement any product of the invention or method must be not necessarily
Need to reach all the above advantage simultaneously.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the system structure diagram of the embodiment of the present invention；
Fig. 2 is the structural representation of application photon lantern in the embodiment of the present invention；
Fig. 3 processes block diagram for the coherent receiver of the embodiment of the present invention for optical signal unit recipient all the way；
Fig. 4 is coherent reception block diagram of the embodiment of the present invention for multichannel single mode optical signal；
Fig. 5 is a kind of overall structure diagram of the embodiment of the present invention；
Fig. 6 is the flow chart of the coherent reception method based on photon lantern provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Space Optical Communication Technologies, compared to traditional wireless communication technology, with two aspect advantages, one is strong security,
Only on the straight line of beam propagation, information can just be trapped；Two is big spectral range, and bandwidth resources are enriched, and need not move through and award
Weighing can be to use.Space Optical Communication Technologies are in satellite Wide Band Data transmission, military security communications and liaison, air traffic control and network
The fields such as seamless coverage have a extensive future.Communication quality is the research emphasis of Space Optical Communication Technologies, atmospheric interference effect
The power of optical signal and phase can be made to produce distortion, cause communication quality to decline, wherein turbulent atmosphere can cause laser light occur
Beam drift, extension, influence light beam coupling so that light beam smoothly cannot be coupled into optical fiber, and each pattern in light beam also cannot
By diversity reception, so as to reliable communication cannot be realized.
For the influence that the turbulent atmosphere in atmospheric interference effect is produced to optical signal, in order to improve under turbulent-flow conditions freely
Spatial light and improves space optical communication coherent reception performance to the coupling efficiency of single-mode fiber, and prior art is using based on single
The coherent reception method of road coupling, improves spatial light to the coupling efficiency of optical fiber, generally using single-mode fiber using number of ways
And multimode fibre.Single-mode fiber can only receive the optical signal of single-mode, and the single-mode optical signal transmission that will be received to
Coherent receiver, for single mode optical signal, coherent receiver is easily achieved efficient coherent reception, but single-mode fiber core diameter
Too small, under strong turbulence air, the coupling efficiency of light is low；During using multimode fibre coherent reception, the core diameter of multimode fibre is big, strong rapid
Under stream air, coupling efficiency is higher, but the pattern of multimode fibre output light includes multimode optical signal, few mould optical signal, single mode
Optical signal, pattern mix, and coherent receiver is difficult to the coherent reception of single mode optical signal to the optical signal that various modes mix.
So the method for reseptance based on single channel coupling cannot simultaneously improve the coupling efficiency and spatial light of free space optical under turbulent-flow conditions
Communication coherent receptivity.
In order to solve problems of the prior art, the invention provides a kind of coherent reception system based on photon lantern
System, is described in detail individually below.
In a first aspect, the invention provides a kind of coherent reception system based on photon lantern, Fig. 1 is the embodiment of the present invention
System structure diagram, the system includes：Reception antenna 101, photon lantern 102, coherent receiver 103；Wherein,
Reception antenna 101, for receiving free space optical, free space optical is coupled；
FSO, is the communication mode for carrying out transmission information as carrier wave with laser with air as medium.For light
The reception antenna of signal receiving end, it should free space optical of the reception as much as possible comprising echo signal, then will be from
By space optical coupling to wave filter or other optical signal prosessing ends.The effect of the reception antenna 101 in the embodiment of the present invention is just
It is received from by spatial light, and by free space optical coupling.Light containing various modes in free space optical, the freedom after coupling
Spatial light still contains various modes.
Photon lantern 102, for receiving the free space optical after coupling, multichannel is converted into by the free space optical after coupling
Single mode optical signal, and transmit multichannel single mode optical signal；
Photon lantern 102 is a kind of optics, is that closely symmetrical to be distributed in refractive index lower slightly by many single-mode fibers
In the device in the glass bushing of fibre cladding, then carrying out drawing cone treatment to obtain to whole sleeve pipe.The device can realize by
The light output of multiple patterns is multiple single-mode optics.
Photon lantern 102 receives the free space optical after being coupled by reception antenna 101 in the embodiment of the present invention, due to photon
The function of the device of lantern 102, the free space optical after coupling still contains various modes, and photon lantern 102 can be by after coupling
Various modes in free space optical, are output as multichannel single mode optical signal.The output end of photon lantern 102 is connected with many single modes
Optical fiber, multichannel single mode optical signal is transmitted by many single-mode fibers.
Mode Coupling is carried out using photon lantern 102, the coupling efficiency of light can be improved, different from traditional utilization single mode
Optical fiber is coupled, photon lantern 102 can further improve in space optical communication system under the conditions of strong turbulence transmission distance
From and message capacity, be conducive to subsequently realizing the coherent reception of light.
Coherent receiver 103, for receiving multichannel single mode optical signal, relevant combining is carried out by multichannel single mode optical signal, is obtained
To optical signal all the way.
Coherent receiver 103 is a kind of coherent reception equipment, and its operation principle is to go detection using carrier phase information
And receive signal.Coherent receiver 103 in the embodiment of the present invention is made up of multiple devices, and each single-mode fiber receiving terminal has
One coherent reception equipment.The output end of photon lantern 102 is multichannel single-mode fiber, each for what photon lantern 102 was exported
Road single mode optical signal all carries out coherent reception treatment, and multichannel single mode optical signal is combined, and obtains optical signal all the way, and this is all the way
Optical signal is exactly useful signal.
Coherent reception system based on photon lantern 102 provided in an embodiment of the present invention, by introducing photon lantern 102,
Can realize that by the light output of multiple patterns be the single mode optical signal of multichannel, to realize under turbulent-flow conditions, improve spatial light
Coupling efficiency, for every single-mode optics signal all the way that photon lantern 102 is exported, coherent receiver 103 can carry out coherent reception
Treatment, coherent reception when can realize that various modes mix.
Specifically, reception antenna 101 includes：Coupled lens, for free space optical to be coupled；
Optically, reception antenna 101 can also be a coupled lens, and coupled lens can focus on free space optical
To in optical fiber.Free space can be improved into convergent effect optically coupling to the multimode end of photon lantern using coupled lens, made certainly
Obtain more accurate by space optical coupling.
Specifically, photon lantern 102, for the various modes light in the free space optical after coupling to be converted into multichannel list
Mould optical signal；
Fig. 2 is the structural representation of application photon lantern 102 in the embodiment of the present invention, and less fundamental mode optical fibre 201 in figure are receiving
It is connected with less fundamental mode optical fibre 201 between antenna 101 and the multimode input of photon lantern 102, less fundamental mode optical fibre 201 is in principle not
It is required, but in a practical situation, increases this section of less fundamental mode optical fibre 201 and be easy to collect the hot spot for focusing on, and beneficial to collection
Into.Because photon lantern 102 is limited as a device, length, and can not be bent, therefore in a practical situation, with
The less fundamental mode optical fibre 201 that the multimode end of photon lantern 102 matches is necessary.The output end of photon lantern device 202 is single in figure
Mode fiber 203, and be made up of multichannel single-mode fiber 203.
Due to containing various modes, the freely sky that photon lantern 202 can be after coupling in the free space optical after coupling
Between multimode fibre in light be converted into multichannel single mode optical signal, do not have transformation for single-mode fiber therein, but can
With direct output multi-channel single mode optical signal, although the coupling efficiency without raising free space optical to single-mode fiber 203, but have
Beneficial to follow-up coherent reception, and for the multimode fibre in free space optical, photon lantern 202 can improve the coupling of spatial light
Close efficiency, coherent reception when can realize that various modes mix again.
Specifically, coherent receiver 103, for multichannel single mode optical signal to be carried out into relevant mixing, balance reception, number successively
Mould conversion, Digital Signal Processing treatment；
Referring to Fig. 3, Fig. 3 is that embodiment of the present invention coherent receiver 103 processes block diagram for optical signal unit recipient all the way；
It is concerned with successively respectively with local oscillator light respectively by the optical signal of the entrance multichannel single-mode fiber after patten transformation
After mixing, balance reception, Analog-digital Converter Digital Signal Processing is carried out in feeding digital signal processor.Multichannel light is adopted in real time
Sample oscillograph can also realize said process, digital signal processing algorithm can processed offline in a computer, can quickly test
Demonstrate,prove the feasibility of algorithm.Compared with traditional single channel reception technique, multipath reception can be supported flexible based on Digital Signal Processing
Relevant combining and channel impairments compensation.
By taking the treatment of optical signal all the way as an example, from the single mode signal of the single-mode fiber output end of photon lantern 202 output, pass through
Frequency mixer 301, is mixed with locally generated signal, that is, local oscillator light, and mixing is letter using the local oscillator light of higher-wattage
Number light provides gain, it is ensured that receiver obtains sensitivity and enough amplification quantities higher；Mixing Hou Zaijiangzhe roads optical signal leads to
Overbalance receiver 302 is balanced reception, and the purpose of balance reception is the quality that signal is received to improve；At balance reception
After reason, in order to obtain data signal all the way, it is necessary to analog signal is converted into data signal by digital analog converter 303, need
Carry out the treatment of analog-to-digital conversion；After data signal all the way is converted into, by digital signal processor 304, with numeral
Signal processing algorithm and will be processed in signal feeding coherent reception equipment 305, be obtained effective optical signal all the way, wherein
Comprising the effective information needed for us.
When there is multipath light signal, referring to Fig. 4, Fig. 4 is phase stem grafting of the embodiment of the present invention for multichannel single mode optical signal
Receive block diagram；
Processing method as described above for single mode optical signal all the way is identical, is carried out successively respectively for multichannel single mode optical signal
With after local oscillator light relevant mixing, balance reception, Analog-digital Converter Digital Signal Processing is carried out in feeding digital signal processor.
By multiple frequency mixers 402, it is mixed with locally generated signal, that is, local oscillator light, mixing uses the sheet of higher-wattage
Light shake for flashlight provides gain, it is ensured that receiver obtains sensitivity and enough amplification quantities higher；Mixing Hou Zaijiangzhe roads
Optical signal passes through multiple balanced recivers 403 and is balanced reception, and the purpose of balance reception is the matter that signal is received to improve
Amount；After balance reception treatment, in order to obtain multi-path digital signal, it is necessary to analog signal is changed by digital analog converter 404
Into data signal, it is necessary to carry out the treatment of analog-to-digital conversion；After multi-path digital signal is converted into, by digital signal processor
405, Coherent processing is carried out in sending into coherent receiver 406 with digital signal processing algorithm and by the signal, had all the way
The optical signal of effect, wherein including effective information.
Fig. 5 is a kind of overall structure diagram of the embodiment of the present invention；
In figure, coupled lens 501 focus in less fundamental mode optical fibre 502 free space optical, will be received by less fundamental mode optical fibre 502
The multimode end optically coupling to photon lantern 503 arrived, exports many by the output end multichannel single-mode fiber 504 of photon lantern 503
Road single mode signal, coherent receiver carries out coherent reception treatment, coherent reception processing method such as Fig. 4 to multichannel single-mode fiber 504
Shown, here is omitted.
Coherent reception system based on photon lantern 102 provided in an embodiment of the present invention, by introducing photon lantern 102,
Can realize that by the light output of multiple patterns be the single mode optical signal of multichannel, to realize under turbulent-flow conditions, improve spatial light
Coupling efficiency, for every single-mode optics signal all the way that photon lantern 102 is exported, coherent receiver 103 can carry out coherent reception
Treatment, coherent reception when can realize that various modes mix.
Second aspect, present invention also offers a kind of coherent reception method based on photon lantern, is applied to as above first
The coherent reception system based on photon lantern described in aspect, including：
Referring to Fig. 6, Fig. 6 is the flow chart of the coherent reception method based on photon lantern provided in an embodiment of the present invention：
Step 601, reception antenna 101 receives free space optical, and free space optical is coupled；
Step 602, photon lantern 102 receives the free space optical after coupling, and the free space optical after coupling is converted into
Multichannel single mode optical signal, and transmit multichannel single mode optical signal；
Step 603, coherent receiver 103 receives multichannel single mode optical signal, and multichannel single mode optical signal is realized into relevant combining,
Obtain optical signal all the way.
Coherent reception method based on photon lantern 102 provided in an embodiment of the present invention, by introducing photon lantern 102,
Can realize that by the light output of multiple patterns be the single mode optical signal of multichannel, to realize under turbulent-flow conditions, improve spatial light
Coupling efficiency, for every single-mode optics signal all the way that photon lantern 102 is exported, coherent receiver 103 can carry out coherent reception
Treatment, coherent reception when can realize that various modes mix.
It should be noted that the method for the embodiment of the present invention is using the method for said system, then said system is all
Embodiment is applied to the method, and can reach same or analogous beneficial effect.
Specifically, free space optical is coupled, including：Free space optical is coupled by coupled lens.
Specifically, photon lantern, multichannel single mode optical signal is converted into by the free space optical after coupling, including：Will coupling
Various modes light in free space optical afterwards is converted into multichannel single mode optical signal.
Specifically, after coherent receiver reception multichannel single mode optical signal, including：Multichannel single mode optical signal is carried out successively
Relevant mixing, balance reception, digital-to-analogue conversion, Digital Signal Processing treatment.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Each embodiment in this specification is described by the way of correlation, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially for device reality
Apply for example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. a kind of coherent reception system based on photon lantern, it is characterised in that including：Reception antenna, photon lantern, phase stem grafting
Receipts machine：
The reception antenna, for receiving free space optical, the free space optical is coupled；
The photon lantern, for receiving the free space optical after coupling, the free space optical after the coupling is converted into many
Road single mode optical signal, and transmit the multichannel single mode optical signal；
The coherent receiver, for receiving the multichannel single mode optical signal, relevant conjunction is carried out by the multichannel single mode optical signal
Road, obtains optical signal all the way.
2. system according to claim 1, it is characterised in that the reception antenna includes：
Coupled lens, for the free space optical to be coupled.
3. system according to claim 2, it is characterised in that the photon lantern, specifically for by after the coupling
Various modes light in free space optical is converted into multichannel single mode optical signal.
4. system according to claim 3, it is characterised in that the coherent receiver, specifically for by the multichannel list
Mould optical signal carries out relevant mixing, balance reception, digital-to-analogue conversion, Digital Signal Processing treatment successively.
5. a kind of coherent reception method based on photon lantern, it is characterised in that be applied to such as any one of Claims 1-4 institute
The coherent reception system based on photon lantern stated, methods described includes：
Reception antenna receives free space optical, and the free space optical is coupled；
Photon lantern receives the free space optical after coupling, and the free space optical after the coupling is converted into multichannel single-mode optics letter
Number, and transmit the multichannel single mode optical signal；
Coherent receiver receives the multichannel single mode optical signal, and the multichannel single mode optical signal is realized into relevant combining, obtains one
Road optical signal.
6. method according to claim 5, it is characterised in that described to be coupled the free space optical, including：Institute
Free space optical is stated to be coupled by coupled lens.
7. method according to claim 6, it is characterised in that the photon lantern, by the free space after the coupling
Light is converted into multichannel single mode optical signal, including：Various modes light in free space optical after the coupling is converted into multichannel
Single mode optical signal.
8. method according to claim 7, it is characterised in that the coherent receiver receives the multichannel single mode optical signal
Afterwards, methods described includes：The multichannel single mode optical signal is carried out into relevant mixing, balance reception, digital-to-analogue conversion, numeral successively
Signal processing technology treatment.
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