CN109600171A - Free Space Optics based on few mould multi-core optical fiber receive system - Google Patents
Free Space Optics based on few mould multi-core optical fiber receive system Download PDFInfo
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- CN109600171A CN109600171A CN201910000514.XA CN201910000514A CN109600171A CN 109600171 A CN109600171 A CN 109600171A CN 201910000514 A CN201910000514 A CN 201910000514A CN 109600171 A CN109600171 A CN 109600171A
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- optical fiber
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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
-
- 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
-
- 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
- H04B10/615—Arrangements affecting the optical part of the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
A kind of Free Space Optics reception system based on few mould multi-core optical fiber.Being characterized in that its reception system is constituted includes receiving antenna, few mould multi-core optical fiber, pattern demultiplexer, detector and receiver.Present invention aims at the further Free Space Optics that develop to receive system, proposes a kind of Free Space Optics reception system based on few mould multi-core optical fiber.The system features are to take full advantage of the characteristics of few mould multi-core optical fiber is to higher tolerance when light beam is misaligned is received.The invention can increase the coupling efficiency of free space optical, reducing atmospheric turbulance disturbance bring influences, to reduce bit error rate when signal demodulation, in addition, the present invention can reduce the requirement to light beam acquiring tracking accuracy is received, and receive system to Free Space Optics such as remote free space optical communication and laser radars and have very important significance.
Description
Technical field
The present invention relates to Free Space Optics to receive system, especially a kind of free space optical based on few mould multi-core optical fiber
Learn reception system.
Background technique
It is that will reach the optical coupling of reception system into a kind of means in receiver that Free Space Optics, which receive system,.Mesh
Before, due to the development of fibre optic receiver, optical fiber reception becomes a kind of main way.Wherein, single mode optical fiber core diameter is too small, atmosphere
Under turbulent flow condition, coupling efficiency is too low.For multimode fibre due to receiving a modes up to a hundred simultaneously, subsequent processing difficulty is big.Recently, few
The reception mode of mode fiber causes concern.
The prior art [1] (D.H.Zheng, Y.Li, E.H.Chen, B.B.Li, D.M.Kong, W.Li, et al., "
Free-space to few-mode-fiber coupling under atmospheric turbulence,"Optics
2016.) Express, vol.25, pp.18739-18755, Aug 8 is proposed using the received method of less fundamental mode optical fibre, into
The coupling efficiency of one step increase free space optical.The prior art [2] (D.Zheng, Y.Li, H.Zhou, Y.Bian, C.Yang,
W.Li,et al.,"Performance enhancement of free-space optical communications
under atmospheric turbulence using modes diversity coherent receipt,"Optics
Express, vol.26, pp.28879-28890,2018.) and the prior art [3] (M.Arikawa and T.Ito, "
Performance of mode diversity reception of a polarization-division-
multiplexed signal for free-space optical communication under atmospheric
Turbulence, " Optics Express, vol.26, pp.28263-28276,2018.) it demonstrates and is connect using less fundamental mode optical fibre
Time receiving can reduce the influence of atmospheric turbulance.But when less fundamental mode optical fibre reception, since optical fiber core diameter is small, connect in signal light arrival
When receipts system, accurate adjusting fiber position difficulty is big, and free space coupling efficiency is low.
In view of problem above, we have carried out the Free Space Optics based on few mould multi-core optical fiber and have received systematic research.
Few mould multi-core optical fiber (R.G.H.van Uden, R.A.Correa, E.A.Lopez, F.M.Huijskens, C.Xia, G. Li, et
al.,"Ultra-high-density spatial division multiplexing with a few-mode
Multicore fibre, " Nature Photonics, vol.8, pp.865-870, Nov 2015.) in fiber optic communication
Very big application is achieved, but application or blank between free light in optical system.Few mould multi-core optical fiber is containing more
The optical fiber of a few mould fibre core.Application of few mould multi-core optical fiber in Free Space Optics reception system can further increase freedom
The coupling efficiency of spatial light, reducing atmospheric turbulance disturbance bring influences, so that bit error rate when signal demodulation is reduced, in addition,
The present invention can reduce the requirement to light beam acquiring tracking accuracy is received, to remote free space optical communication and laser radar etc.
Free Space Optics receive system and have very important significance.
Summary of the invention
Present invention aims at the further Free Space Optics that develop to receive system, proposes a kind of based on few mould multi-core optical
Fine Free Space Optics receive system.The present invention can increase the coupling efficiency of free space optical, reduce atmospheric turbulance disturbance
Bring influences, so that bit error rate when signal demodulation is reduced, in addition, the present invention can be reduced to reception light beam acquiring tracking essence
The requirement of degree receives system with very important to Free Space Optics such as remote free space optical communication and laser radars
Meaning.
Technical solution of the invention is as follows:
A kind of Free Space Optics reception system based on few mould multi-core optical fiber, it is characterized in that: including receiving antenna, less
Mould multi-core optical fiber, pattern demultiplexer, detector group and receiver；Signal light is after free space atmospheric turbulance by described
Receiving antenna, free space optical is optically coupled, is transmitted to after then being received by few mould multi-core optical fiber described
The signal light received is converted into multichannel single mode signal by pattern demultiplexer, the pattern demultiplexer, then through the detection
Device group is received after converting optical signals to electric signal by the receiver, which solves the electric signal received
It adjusts.
Further, the detector group include the first detector, the second detector ..., the n-th detector；Described
The output end of pattern demultiplexer respectively with first detector, the second detector ... and the input of the n-th detector
End is connected, the input terminal of the receiver respectively with first detector, the second detector ... and the n-th detector
Output end be connected.
It further, further include local oscillator laser light source, fiber optic splitter and frequency mixer group, which includes the first mixing
Device, the second frequency mixer ... and the n-th frequency mixer, the detector group include the first detector, the second detector ...,
N-th detector；
The output end of the pattern demultiplexer respectively with first frequency mixer, the second frequency mixer ..., n-th
The first input end of frequency mixer is connected, the input terminal phase of the output end and the fiber optic splitter of the local oscillator laser light source
Even, the output end of the fiber optic splitter respectively with first frequency mixer, the second frequency mixer ..., the n-th frequency mixer second
Input terminal is connected；The first output end and second output terminal of first frequency mixer respectively with first detector
One input terminal and the second input terminal are connected, the first output end and second output terminal of second frequency mixer respectively with it is described
The first input end of second detector and the second input terminal are connected ... ..., the first output end and second of n-th frequency mixer
Output end is connected with the first input end of n-th detector and the second input terminal respectively, first detector, second
Detector ..., the output end of the n-th detector is connected with the input terminal of the receiver respectively.
Further, few mould multi-core optical fiber be it is a kind of be made of multiple fibre cores, be separated by between each fibre core one section away from
From special fiber.Each fibre core includes a small amount of several modes, such as LP01, LP11a and LP11b isotype.
Compared with prior art, the beneficial effects of the present invention are:
1. increasing the coupling efficiency of free space optical in the present invention.
2. reducing atmospheric turbulance disturbance bring in the present invention influences, to reduce bit error rate when signal demodulation.
3. reducing the requirement for aiming at received free space optical tracking accuracy in the present invention.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams that the Free Space Optics of few mould multi-core optical fiber receive system.
Fig. 2 is the structural schematic diagram of few mould multi-core optical fiber in the present invention.
Fig. 3 is that the Free Space Optics based on few mould multi-core optical fiber of the embodiment of the present invention receive the knot of direct detection system
Structure schematic diagram.
Fig. 4 is that the Free Space Optics based on few mould multi-core optical fiber of the embodiment of the present invention receive the knot of coherent detection system
Structure schematic diagram.
Fig. 5 is the received relevant spy of the Free Space Optics coherently combined based on few mould multi-core optical fiber of the embodiment of the present invention
The structural schematic diagram of examining system.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples, but guarantor of the invention should not be limited with this
Protect range.
Fig. 1 is that the present invention is based on the structural schematic diagrams that the Free Space Optics of few mould multi-core optical fiber receive system.It can by figure
See, receive system the present invention is based on the Free Space Optics of few mould multi-core optical fiber, including receiving antenna 1, few mould multi-core optical fiber 2,
Pattern demultiplexer 3, detector 4 and receiver 5；Signal light passes through the receiving antenna after free space atmospheric turbulance
1, free space optical is optically coupled, is then received with few mould multi-core optical fiber 2, passes through the mould later
The signal light received is converted into multichannel single mode signal by formula demultiplexer 3, converts optical signal using the detector 4
For electric signal, finally, the electric signal received is carried out processing demodulation by the receiver 5.
The coupling efficiency of each receiving port of few mould multi-core optical fiber are as follows:
Then lack total coupling efficiency of mould multicore are as follows:
It is received compared to few mould single-core fiber, coupling efficiency is significantly increased.And when there are inclination and offsets and transverse direction for light beam
When offset, coupling efficiency is all apparently higher than less fundamental mode optical fibre reception.
Fig. 2 is the structural schematic diagram of few mould multi-core optical fiber in the present invention.Fibre core number in the present invention in few mould multi-core optical fiber
Mesh is greater than 1, and the model number of each fibre core is greater than 1.The fibre core of various difference arrangements and the fibre core of different mode selection
Few mould multi-core optical fiber all within protection scope of the present invention.
Fig. 3 is that the Free Space Optics based on few mould multi-core optical fiber of the embodiment of the present invention receive the knot of direct detection system
Structure schematic diagram, including receiving lens 1, few mould multi-core optical fiber 2, pattern demultiplexer 3, detector group and receiver 5；
Signal light is irradiated to few mould multicore after free space atmospheric turbulance after the receiving lens 1
On optical fiber 2, the output end of few mould multi-core optical fiber 2 is connected with the input terminal of the pattern demultiplexer 3, the mould
First output end of formula demultiplexer 3, second output terminal, third output end ..., the n-th output end respectively with the detection
The input of the input terminal, the input terminal, third detector 343 of the second detector 342 of the first detector 341 in device group
End ..., the input terminal of the n-th detector 34n be connected, the output end of the first detector 341 in the detector group 34, the
The output end ... ... of the output ends of two detectors 342, third detector 343, the output end of the n-th detector 34n respectively with institute
The first input end for the receiver 5 stated, the second input terminal, third input terminal ..., the n-th input terminal be connected.
Fig. 4 is that the Free Space Optics based on few mould multi-core optical fiber of the embodiment of the present invention receive the knot of coherent detection system
Structure schematic diagram, as shown, including receiving lens 1, few mould multi-core optical fiber 2, pattern demultiplexer 3, local oscillator laser light source 44, light
Fine beam splitter 45, frequency mixer group 46, detector group 47 and receiver 5；
Signal light is irradiated to few mould multicore after free space atmospheric turbulance after the receiving lens 1
On optical fiber 2, the output end of few mould multi-core optical fiber 2 is connected with the input terminal of the pattern demultiplexer 3, the mould
First output end of formula demultiplexer 3, second output terminal, third output end ..., the n-th output end is mixed with described respectively
The first input end of the first frequency mixer 461, the first input end of the second frequency mixer 462, third frequency mixer 463 in device group 46
First input end ..., the first input end of the n-th frequency mixer 46n be connected, the output end of the local oscillator laser light source 44 with
The input terminal of the fiber optic splitter 45 is connected, the first output end of the fiber optic splitter 45, second output terminal, third
Output end ..., the n-th output end respectively with the second input terminal of the first frequency mixer 461 in the frequency mixer group 46, second
Second input terminal of frequency mixer 462, third frequency mixer 463 the second input terminal ..., the second input of the n-th frequency mixer 46n
End be connected, the first output end and second output terminal of the first frequency mixer 461 in the frequency mixer group 46 respectively with it is described
The first input end and the second input terminal of the first balanced detector 471 in balanced detector group 47 are connected, the frequency mixer
The first output end and second output terminal of the second frequency mixer 462 in group 46 respectively with the in the balanced detector group 47
The first input end and the second input terminal of two balanced detectors 472 are connected, the third frequency mixer 463 in the frequency mixer group 46
The first output end and second output terminal respectively with the third balanced detector 473 in the balanced detector group 47 first
Input terminal and the second input terminal are connected ... ..., the first output end of the n-th frequency mixer 46n in the frequency mixer group 46 and the
Two output ends are inputted with the first input end of the n-th balanced detector 47n in the balanced detector group 47 and second respectively
End is connected, the output end of the first balanced detector 471 in the balanced detector group 47, the second balanced detector 472
Output end, third balanced detector 473 output end ..., the output end of the n-th balanced detector 47n connects with described respectively
The first input end of receipts machine 5, the second input terminal, third input terminal ..., the n-th input terminal be connected.
Fig. 5 is the received relevant spy of the Free Space Optics coherently combined based on few mould multi-core optical fiber of the embodiment of the present invention
The structural schematic diagram of examining system, as shown, including receiving lens 1, few mould multi-core optical fiber 2, pattern demultiplexer 3, relevant conjunction
Beam device 51, detector 4, local oscillator laser light source 53 and receiver 5；
Signal light is irradiated to few mould multicore after free space atmospheric turbulance after the receiving lens 1
On optical fiber 2, the output end of few mould multi-core optical fiber 2 is connected with the input terminal of the pattern demultiplexer 3, the mould
First output end of formula demultiplexer 3, second output terminal, third output end ..., the n-th output end respectively with it is described relevant
First input end, the second input terminal, third input terminal in bundling device 51 ..., the n-th input terminal be connected, the relevant conjunction
The output end of beam device 51 is connected with the first input end of the detector 4, the output end of the local oscillator laser light source 53 with
Second input terminal of the detector 4 is connected, the input with the receiver 5 respectively of the output end of the detector 4
End is connected.
The present invention can increase the coupling efficiency of free space optical, and reducing atmospheric turbulance disturbance bring influences, to drop
Bit error rate when low signal demodulates, in addition, the present invention can reduce the requirement to light beam acquiring tracking accuracy is received, to remote
The Free Space Optics such as free space optical communication and laser radar receive system and have very important significance.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all in this hair
Any modification, equivalent substitution, improvement and etc. done within bright spirit and principle, be all contained in protection scope of the present invention it
It is interior.
Claims (4)
1. a kind of Free Space Optics based on few mould multi-core optical fiber receive system, it is characterised in that: including receiving antenna (1),
Few mould multi-core optical fiber (2), pattern demultiplexer (3), detector group and receiver (5)；Signal light is rapid by free space atmosphere
By the receiving antenna (1) after stream, free space optical is optically coupled, then by few mould multi-core optical fiber (2)
The pattern demultiplexer (3) is transmitted to after reception, which is converted into the signal light received more
Road single mode signal, then received after the detector group converts optical signals to electric signal by the receiver (5), this connects
Receipts machine (5) demodulates the electric signal received.
2. the Free Space Optics based on few mould multi-core optical fiber receive system according to claim 1, it is characterised in that: the spy
Survey device group include the first detector, the second detector ..., the n-th detector；The output end of the pattern demultiplexer is distinguished
With first detector, the second detector ... and the input terminal of the n-th detector is connected, the receiver (5)
Input terminal respectively with first detector, the second detector ... and the output end of the n-th detector is connected.
3. the Free Space Optics based on few mould multi-core optical fiber receive system according to claim 1, it is characterised in that: further include this
Shake laser light source, fiber optic splitter and frequency mixer group, the frequency mixer group include the first frequency mixer, the second frequency mixer ... and the
N frequency mixer, the detector group include the first detector, the second detector ..., the n-th detector；
The output end of the pattern demultiplexer respectively with first frequency mixer, the second frequency mixer ..., n-th be mixed
The first input end of device is connected, and the output end of the local oscillator laser light source is connected with the input terminal of the fiber optic splitter,
The output end of the fiber optic splitter respectively with first frequency mixer, the second frequency mixer ..., the n-th frequency mixer it is second defeated
Enter end to be connected；The first output end and second output terminal of first frequency mixer respectively with first detector first
Input terminal and the second input terminal are connected, and the first output end and second output terminal of second frequency mixer are respectively with described the
The first input end of two detectors and the second input terminal are connected ... ..., the first output end of n-th frequency mixer and second defeated
Outlet is connected with the first input end of n-th detector and the second input terminal respectively, and first detector, second are visited
Survey device ..., the output end of the n-th detector is connected with the input terminal of the receiver respectively.
4. -3 any Free Space Optics based on few mould multi-core optical fiber receive system according to claim 1, it is characterised in that: institute
The few mould multi-core optical fiber (2) stated is made of multiple fibre cores, between each fibre core at a distance and each fibre core includes few
Measure several modes, such as LP01, LP11a and LP11b isotype.
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| CN201910000514.XA CN109600171A (en) | 2019-01-02 | 2019-01-02 | Free Space Optics based on few mould multi-core optical fiber receive system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110149154A (en) * | 2019-04-10 | 2019-08-20 | 华中科技大学 | The preposition amplification coherent reception system of few mould and method for free space optical signal |
| CN110190899A (en) * | 2019-06-11 | 2019-08-30 | 北京科技大学 | A kind of free space of flexible high speed-less fundamental mode optical fibre mixed communication device |
| CN111385024A (en) * | 2020-03-30 | 2020-07-07 | 南京信息工程大学 | Multi-core less-mode sensing communication fusion access transmission system |
| WO2023134327A1 (en) * | 2022-01-12 | 2023-07-20 | 华为技术有限公司 | Light receiving module, device and method |
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| CN111385024A (en) * | 2020-03-30 | 2020-07-07 | 南京信息工程大学 | Multi-core less-mode sensing communication fusion access transmission system |
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| WO2023134327A1 (en) * | 2022-01-12 | 2023-07-20 | 华为技术有限公司 | Light receiving module, device and method |
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Application publication date: 20190409 |