CN107579776A - Optical fiber telecommunications system based on free space - Google Patents
Optical fiber telecommunications system based on free space Download PDFInfo
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- CN107579776A CN107579776A CN201710857794.7A CN201710857794A CN107579776A CN 107579776 A CN107579776 A CN 107579776A CN 201710857794 A CN201710857794 A CN 201710857794A CN 107579776 A CN107579776 A CN 107579776A
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- optical fiber
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Abstract
The invention discloses the optical fiber telecommunications system based on free space,Relate generally to optic communication,The present invention includes optical fiber,Laser,Signal source,AWG,First spatial light modulator,Circulator,Second space optical modulator,Pump light source,Signal transmission fiber,Erbium-doped fiber amplifier,Photodetector,Data collecting card,Computer and four optical fiber collimators,Signal source controls the first spatial light modulator that the electric signal to be transmitted is carried on flashlight by AWG,The frequency difference of the pumping light frequency of pump light source and signal light frequency is adjusted to a Brillouin shift by AWG by second space optical modulator,Brillouin amplification is carried out to flashlight so as to realize,The gain coefficient of the amplification mechanism is high,Pumping efficiency is high,Required pump power is low,And the combination of spatial light modulator and optical fiber collimator is more suitable for high speed optical communication system.
Description
Technical field
The present invention relates to optic communication, and in particular to the optical fiber telecommunications system based on free space.
Background technology
Fibre Optical Communication Technology is shown one's talent from optic communication, it has also become one of mainstay of modern communicationses, in modern electricity
Very important effect is played in letter net.Fiber optic communication is as an emerging technology, its fast, application surface of development speed in recent years
Be extensively communication it is rarely seen in history, and in the important symbol of new worldwide technological revolution and Future Information society various information master
Want means of transportation.
But Raman amplifiction is typically used to optical signal amplification means in optical fiber telecommunications system at present, due to Raman amplifiction
Gain coefficient is low, pumping efficiency is low, and pump power is high to cause fibre-optical splice and photoelectric device to be easily burned, and involves great expense,
Be not suitable for LAN fiber optic communication or small-scale optical fiber telecommunications system in summary.
The content of the invention
Present invention aims at solving the above problems, in view of the above-mentioned problems, the invention provides the light based on free space
Fiber communication system, the optic communication based on Brillouin amplification is employed, its gain coefficient is high, pumping efficiency is high, required pump power
It is relatively low to cause the interface of fibre-optical splice and photoelectric device not easy burn-out, it is suitable for LAN fiber optic communication or small-scale optical fiber leads to
Letter system.
The purpose of the present invention is achieved through the following technical solutions：
Optical fiber telecommunications system based on free space, including optical fiber, laser, the first spatial light modulator, circulator,
Two spatial light modulators, pump light source, signal transmission fiber, photodetector, data collecting card, computer and multiple optical fiber are accurate
Straight device；The output end of the laser is connected by optical fiber with an optical fiber collimator, and the optical fiber collimator is used for will
Laser alignment in optical fiber is used as flashlight into own space, and the flashlight enters in the first spatial light modulator, described
The modulation of first spatial light modulator is terminated with AWG, and the control of the AWG is terminated with signal
Source, the signal source are used to produce communication signal and send to AWG, the AWG to be used for root
Electric carrier wave is produced according to the communication signal of signal source transmission, first spatial light modulator receives electric carrier wave and in own
Flashlight in space carries out electro-optical modulation；Flashlight after the completion of the modulation of first spatial light modulator is laggard by own space
Enter in an optical fiber collimator, the optical fiber collimator is used to collimate the flashlight in free space into optical fiber, with laggard
Enter the second port of the circulator；The laser being emitted by pump light source is connected by optical fiber with an optical fiber collimator, described
Optical fiber collimator is used to the laser alignment in optical fiber entering second space as pump light, the pump light into own space
In optical modulator, the modulated terminal of the second space optical modulator is controlled by AWG, second space optical modulator
It is the frequency phase-difference Brillouin shift with flashlight by the frequency modulation(PFM) of pump light；After the completion of second space light modulator modulates
Pump light after free space by entering in optical fiber collimator, and the optical fiber collimator is by the pump light in free space
Collimate into optical fiber, subsequently enter the first port of the circulator；3rd port of the circulator connects with signal transmission fiber
Connect, photodetector is entered by signal transmission fiber by the flashlight after pumping light amplification, the photodetector is used for will
Laser is converted to electric signal, and the output end of photodetector and the input of data collecting card connect, the output of data collecting card
End is connected with computer, and data collecting card is used for the electric signal for gathering photodetector output, and computer is adopted for processing data
The data that truck is collected.
The present invention is in use, laser be used as flashlight into the after laser emitting by optical fiber and optical fiber collimator
The electric signal to be transmitted is transmitted to AWG by one spatial light modulator, signal source, and AWG is controlled again
Make on the flashlight that the first spatial light modulator is modulated the electric signal in free space, the flashlight modulated subsequently enters
The second port of circulator；Laser enters second space light after being used as pump light by optical fiber collimator as caused by pump light source
Modulator, it by the frequency modulation(PFM) of pump light is frequency phase with flashlight that AWG, which controls second space optical modulator,
A poor Brillouin shift value, the pump light after being modulated enter the second port of circulator by the first port of circulator,
Pump light goes in the same direction with flashlight, so just realizes pump light and carries out Brillouin amplification to flashlight；In Brillouin amplification
In mechanism, gain coefficient is high, pumping efficiency is high, and required pump power is relatively low；Exaggerated flashlight is from the second end of circulator
Oral instructions then pass sequentially through signal transmission fiber, photodetector, data collecting card and calculating to the 3rd port of circulator
Machine, signal transmission fiber are the optical fiber for transmission, and signal transmission fiber and optical fiber are same optical fiber in the present invention, difference
It is different for length, the received data of final computer analysis, that is, complete whole fiber optic communication process.In addition, utilize light
Fibre can strengthen signal stabilization and the easy tonality of signal as optical communication medium；The modulation efficiency of utilization space optical modulator is high, energy
Consume that low, modulating speed is fast, be particularly suited for high speed optical communication system.
Further, the laser uses semiconductor laser, its cheap, stable performance.
Further, the optical fiber and signal transmission fiber use polarization-maintaining type multimode fibre, the signal transmission fiber
Has tempering covering in appearance, polarization-maintaining type multimode fibre, which can eliminate, polarizes correlated noise in optical fiber.
Further, the signal transmission fiber includes multiple erbium-doped fiber amplifiers, multiple erbium-doped fiber amplifiers
Series connection access signal transmission fiber, for further amplifying optical signal.
Compared with prior art, the invention has the advantages that：The present invention include optical fiber, laser, signal source, appoint
Anticipate waveform generator, the first spatial light modulator, circulator, second space optical modulator, pump light source, signal transmission fiber,
Erbium-doped fiber amplifier, photodetector, data collecting card, computer and four optical fiber collimators, signal source pass through any ripple
Shape generator controls the first spatial light modulator that the electric signal to be transmitted is carried on flashlight, and AWG leads to
Cross second space optical modulator and the frequency difference of the pumping light frequency of pump light source and signal light frequency be adjusted to a Brillouin shift,
Brillouin amplification is carried out to flashlight so as to realize, the gain coefficient of the amplification mechanism is high, pumping efficiency is high, required pump power
It is low, and the combination of spatial light modulator and optical fiber collimator is more suitable for high speed optical communication system.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
As shown in figure 1, solid line represents optical fiber in figure, the solid line with arrow represents the laser optical path in free space, empty
Line represents that electric signal control circuit, the optical fiber telecommunications system based on free space, including optical fiber, laser, the first spatial light are adjusted
Device processed, circulator, second space optical modulator, pump light source, signal transmission fiber, photodetector, data collecting card, calculating
Machine and multiple optical fiber collimators, optical fiber and signal transmission fiber use polarization-maintaining type multimode fibre, and signal transmission fiber is in appearance
With tempering covering, laser uses semiconductor laser；The output end of laser passes through optical fiber and a fiber optic collimator
Device connects, and optical fiber collimator is used to the laser alignment in optical fiber entering first as flashlight, flashlight into own space
In spatial light modulator, the modulation of the first spatial light modulator is terminated with AWG, the control of AWG
System is terminated with signal source, and signal source is used to produce communication signal and send to AWG, AWG to use
Electric carrier wave is produced in the communication signal sent according to signal source, the first spatial light modulator receives electric carrier wave and in own
Flashlight in space carries out electro-optical modulation；Flashlight after the completion of the modulation of first spatial light modulator is laggard by own space
Enter in an optical fiber collimator, the optical fiber collimator is used to collimate the flashlight in free space into optical fiber, with laggard
Enter the second port of the circulator；The laser being emitted by pump light source is connected by optical fiber with an optical fiber collimator, optical fiber
Collimater is used to the laser alignment in optical fiber entering second space optical modulator as pump light, pump light into own space
In, the modulated terminal of second space optical modulator is controlled by AWG, and second space optical modulator is by the frequency of pump light
Rate is modulated to the frequency phase-difference Brillouin shift with flashlight；Pump light after the completion of second space light modulator modulates passes through certainly
By entering behind space in an optical fiber collimator, the optical fiber collimator collimates the pump light in free space into optical fiber,
Subsequently enter the first port of the circulator；3rd port of circulator is connected with signal transmission fiber, signal transmission fiber
In be in series with multiple erbium-doped fiber amplifiers, photodetection is entered by signal transmission fiber by the flashlight after pumping light amplification
Device, photodetector are used to convert laser light into electric signal, and the output end of photodetector and the input of data collecting card connect
Connect, the output end of data collecting card is connected with computer, and data collecting card is used for the electric signal for gathering photodetector output, meter
Calculation machine is used for the data that processing data capture card is collected.Specifically, phase can be used in the detection light path of photodetector
Dry detection, it can also use and directly detect.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (4)
1. the optical fiber telecommunications system based on free space, it is characterised in that including optical fiber, laser, the first spatial light modulator,
Circulator, second space optical modulator, pump light source, signal transmission fiber, photodetector, data collecting card, computer and
Multiple optical fiber collimators；
The output end of the laser is connected by optical fiber with an optical fiber collimator, and the optical fiber collimator is used for light
Laser alignment in fibre is used as flashlight into own space, and the flashlight enters in the first spatial light modulator, and described the
The modulation of one spatial light modulator is terminated with AWG, and the control of the AWG is terminated with signal
Source, the signal source are used to produce communication signal and send to AWG, the AWG to be used for root
Electric carrier wave is produced according to the communication signal of signal source transmission, first spatial light modulator receives electric carrier wave and in own
Flashlight in space carries out electro-optical modulation；Flashlight after the completion of the modulation of first spatial light modulator is laggard by own space
Enter in an optical fiber collimator, the optical fiber collimator is used to collimate the flashlight in free space into optical fiber, with laggard
Enter the second port of the circulator；
The laser being emitted by pump light source is connected by optical fiber with an optical fiber collimator, and the optical fiber collimator is used for optical fiber
Interior laser alignment is used as pump light into own space, and the pump light enters in second space optical modulator, and described second
The modulated terminal of spatial light modulator is controlled by AWG, and the frequency modulation(PFM) of pump light is by second space optical modulator
With the frequency phase-difference Brillouin shift of flashlight；After pump light after the completion of second space light modulator modulates is by free space
Into in an optical fiber collimator, the optical fiber collimator collimates the pump light in free space into optical fiber, subsequently enters
The first port of the circulator；
3rd port of the circulator is connected with signal transmission fiber, is transmitted by the flashlight after pumping light amplification by signal
Optical fiber enters photodetector, and the photodetector is used to converting laser light into electric signal, the output end of photodetector with
The input connection of data collecting card, the output end of data collecting card are connected with computer, and data collecting card is used to gather photoelectricity
The electric signal of detector output, computer are used for the data that processing data capture card is collected.
2. the optical fiber telecommunications system according to claim 1 based on free space, it is characterised in that the laser uses
Semiconductor laser.
3. the optical fiber telecommunications system according to claim 1 based on free space, it is characterised in that the optical fiber and signal
Transmission Fibers use polarization-maintaining type multimode fibre, and the signal transmission fiber has tempering covering in appearance.
4. the optical fiber telecommunications system according to claim 1 based on free space, it is characterised in that the signal light transmission
Fibre includes multiple erbium-doped fiber amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710857794.7A CN107579776A (en) | 2017-09-21 | 2017-09-21 | Optical fiber telecommunications system based on free space |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710857794.7A CN107579776A (en) | 2017-09-21 | 2017-09-21 | Optical fiber telecommunications system based on free space |
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| CN107579776A true CN107579776A (en) | 2018-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710857794.7A Withdrawn CN107579776A (en) | 2017-09-21 | 2017-09-21 | Optical fiber telecommunications system based on free space |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528198A (en) * | 2017-09-21 | 2017-12-29 | 成都驹月科技有限公司 | A kind of remote signal Transmission system based on optical fiber |
| CN110579178A (en) * | 2019-10-23 | 2019-12-17 | 华北电力大学（保定） | Method and device for eliminating line width dependence of slope type Brillouin dynamic sensing system |
| CN110971333A (en) * | 2019-11-28 | 2020-04-07 | 四川福方科技有限公司 | Two-way time synchronization system and method based on free space laser communication |
Citations (4)
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| CN101929880A (en) * | 2010-08-09 | 2010-12-29 | 宁波诺驰光电科技发展有限公司 | Novel Brillouin optical time domain analyzer |
| CN202978942U (en) * | 2012-12-05 | 2013-06-05 | 合肥鼎臣光电科技有限责任公司 | Free space light communication system based on modulation retro-reflector |
| CN103872552A (en) * | 2014-01-24 | 2014-06-18 | 长春理工大学 | Ultra narrow linewidth tunable microwave signal source |
| WO2017155979A1 (en) * | 2016-03-10 | 2017-09-14 | Alcatel-Lucent Usa Inc. | Optical pumping technique |
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2017
- 2017-09-21 CN CN201710857794.7A patent/CN107579776A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929880A (en) * | 2010-08-09 | 2010-12-29 | 宁波诺驰光电科技发展有限公司 | Novel Brillouin optical time domain analyzer |
| CN202978942U (en) * | 2012-12-05 | 2013-06-05 | 合肥鼎臣光电科技有限责任公司 | Free space light communication system based on modulation retro-reflector |
| CN103872552A (en) * | 2014-01-24 | 2014-06-18 | 长春理工大学 | Ultra narrow linewidth tunable microwave signal source |
| WO2017155979A1 (en) * | 2016-03-10 | 2017-09-14 | Alcatel-Lucent Usa Inc. | Optical pumping technique |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528198A (en) * | 2017-09-21 | 2017-12-29 | 成都驹月科技有限公司 | A kind of remote signal Transmission system based on optical fiber |
| CN110579178A (en) * | 2019-10-23 | 2019-12-17 | 华北电力大学（保定） | Method and device for eliminating line width dependence of slope type Brillouin dynamic sensing system |
| CN110971333A (en) * | 2019-11-28 | 2020-04-07 | 四川福方科技有限公司 | Two-way time synchronization system and method based on free space laser communication |
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Application publication date: 20180112 |
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