CN106226970A - A kind of full photo threshold device based on two-dimensional material wavelength convert function and its preparation method and application - Google Patents
A kind of full photo threshold device based on two-dimensional material wavelength convert function and its preparation method and application Download PDFInfo
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- CN106226970A CN106226970A CN201610649716.3A CN201610649716A CN106226970A CN 106226970 A CN106226970 A CN 106226970A CN 201610649716 A CN201610649716 A CN 201610649716A CN 106226970 A CN106226970 A CN 106226970A
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/365—Non-linear optics in an optical waveguide structure
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
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Abstract
nullThe invention provides a kind of full photo threshold device based on two-dimensional material wavelength convert function，Including light pulse signal source、Image intensifer、Optical signal source to be detected、Fiber coupler、Saturated absorbing body and optical filter，Image intensifer is provided with the first end and the second end，Fiber coupler is provided with first input end、Second input and outfan，Saturated absorbing body is provided with the 3rd end and the 4th end，First end is connected with light pulse signal source，Second end is connected with first input end，Optical signal source to be detected and the second input connect，The optical signal to be detected that the light pulse signal that light pulse signal source produces produces with optical signal source to be detected after image intensifer amplifies together enters fiber coupler and couples，The mixed light formed after coupling is exported by outfan，Outfan and three-terminal link，4th end is connected with optical filter，Saturated absorbing body includes fiber waveguide and is coated on the two-dimensional material of light guide surface.This full photo threshold device architecture is simple, improves the signal to noise ratio of signal.
Description
Technical field
The present invention relates to photoelectron technical field, be specifically related to a kind of full light threshold based on two-dimensional material wavelength convert function
Value device and its preparation method and application.
Background technology
All-optical signal processing is the important development trend of optical fiber telecommunications system and research direction.Based on NRZ
In (Return to Zero, RZ) or the digital optical communication system of burst pulse, such as at optical code division multiple access (Optical Code
Division Multiple Access, OCDMA) and Optical Time Division Multiplexing (Optical Time Division Multiple
Access, OTDMA) in communication system, the most all there is a certain amount of ground noise in the light pulse signal that system receiving terminal receives,
The introduced spontaneous emission noise (ASE noise) of such as amplifier, multiple access interference noise (MAI noise) etc., and this
Severe exacerbation is received the signal to noise ratio of light pulse signal by the existence of interference noise, receives judgement difficulty and strengthens, and tolerance limit reduces, and deteriorates
The receiving sensitivity of receiver, eventually affects the signal receiving performance of digital optical communication system.Therefore, how to eliminate and include
A MAI noise key issue in interior noise floor is light multiple access to communication system.
Full photo threshold technology is one of key technology in elimination MAI noise, and in recent years, this technology causes academia
Extensive concern.At present, existing multiple photo threshold technology is suggested, and the most most commonly seen method is to utilize optical fiber or quasiconductor
Nonlinear effect in medium realizes, it is achieved principle mainly includes adjusting based on self phase modulation (SPM), cross-phase
Effect processed (XPM) and second_harmonic generation (SHG).The core concept of these methods is: the information signal of receiving terminal typically has
There is sufficiently high Instantaneous peak power, nonlinear effect can be produced in nonlinear dielectric, by producing new frequency component, make
Obtain information signal to be saved；And the ground noises such as MAI are relatively low because of power, it is not enough to produce nonlinear effect, thus when it
By being filtered out time in nonlinear dielectric.
Threshold technology based on SPM and XPM typically requires longer nonlinear optical fiber, and relatively big and less stable is lost,
Being based particularly on the scheme of XPM, while required luminous power is higher, its system structure is the most extremely complex.
Reduce required optical signal power to simplify the system structure of threshold technology simultaneously, have scholar to propose utilization week
In phase poled lithium niobate (PPLN) crystal, SHG effect realizes the scheme of threshold value judgement, and the PPLN in system is a kind of novel
High non-linearity semiconductor device, when the pulse signal with MAI noise inputs in PPLN, and correct symbol pulses has enough peaks
Value power light pulses will produce SHG effect when PPLN transmits, and the peak power of MAI noise is not enough to produce SHG effect, logical
Cross to leach two frequency-doubled signals produced in PPLN and can realize threshold value judgement, but the optical signal of SHG wavelength will be difficult to
Optical fiber realizes transmission and processes.For solving this problem, it is thus proposed that the technical scheme that SHG with XPM is combined.?
In PPLN under the effect of XPM effect, two frequency doubled lights that SHG produces will be converted to C-band, with the threshold technology being based solely on SHG
Compare, the threshold technology after this improvement realize cost and complexity is greatly improved.Meanwhile, PPLN is novel as one
Semiconductor device, its cost is the highest, therefore, it is difficult to be used widely.
Therefore, these current threshold device need longer nonlinear optical fiber or need expensive PPLN semiconductor device
Part.Therefore, it is necessary to provide a kind of simple in construction, good stability and lower-cost full photo threshold device.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of full photo threshold device based on two-dimensional material wavelength convert function
Part, the simple in construction of described full photo threshold device based on two-dimensional material wavelength convert function, stability is preferable, and cost is relatively low.
Present invention also offers the preparation method and application of described full photo threshold device based on two-dimensional material wavelength convert function.
First aspect present invention provides a kind of full photo threshold device based on two-dimensional material wavelength convert function, including light
Pulse signal source, image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, described light is put
Big device is provided with the first end and the second end, and described fiber coupler is provided with first input end, the second input and outfan, described full
Being provided with the 3rd end and the 4th end with absorber, described first end is connected with described light pulse signal source, and described second end is with described
First input end connects, and described optical signal source to be detected is connected with described second input, and described light pulse signal source produces
The optical signal to be detected that light pulse signal produces with described optical signal source to be detected after described image intensifer amplifies together enters
Described fiber coupler couples, and the mixed light formed after coupling is exported by described outfan, and described outfan is with described
Three-terminal link, described 4th end is connected with described optical filter, and described saturated absorbing body includes fiber waveguide and is coated on
The two-dimensional material of light guide surface, described saturated absorbing body has wavelength convert function, is used for suppressing in described light pulse signal
Noise.
Wherein, at least during described two-dimensional material includes Graphene, black phosphorus, topological insulator and transient metal sulfide
Kind.
Wherein, described fiber waveguide is micro-nano fiber or nano wire.
Wherein, described image intensifer is erbium doped optical fibre light amplifier or semiconductor optical amplifier.
Wherein, described optical signal to be detected is continuous wave.
Wherein, described optical filter is band filter or band elimination filter.
Wherein, described light pulse signal peak power after described image intensifer amplifies is more than or equal to described saturated suction
The peak value saturation power of acceptor and the insertion loss sum of described fiber coupler.
Based on two-dimensional material wavelength convert function the full photo threshold device architecture that first aspect present invention provides is the simplest
Single, cost is relatively low.It addition, this full photo threshold device need not use nonlinear optical fiber or the PPLN semiconductor device of costliness
Part, thus avoid and use the loss that brings of nonlinear optical fiber relatively big and the defect of poor stability and relatively costly defect.
This full photo threshold device may be used for improving the signal to noise ratio receiving signal, improves signal quality, is conducive to improving optical communication system
Receive judgement performance.
Second aspect present invention provides the preparation of a kind of full photo threshold device based on two-dimensional material wavelength convert function
Method, comprises the following steps:
Two-dimensional material is coated on the surface of fiber waveguide, forms saturated absorbing body；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter are provided, described
Image intensifer is provided with the first end and the second end, and described fiber coupler is provided with first input end, the second input and outfan, institute
Stating saturated absorbing body and be provided with the 3rd end and the 4th end, described first end is connected with described light pulse signal source, described second end with
Described first input end connects, and described optical signal source to be detected is connected with described second input, described outfan and described the
Three-terminal link, described 4th end is connected with described optical filter, forms full light threshold based on two-dimensional material wavelength convert function
Value device.
Wherein, use the method for optical fiber optical tweezers or the method for tear tape that described two-dimensional material is coated on described fiber waveguide
Surface.
The preparation method of based on two-dimensional material wavelength convert function the full photo threshold device that second aspect present invention provides
Simply, easily operate.
Third aspect present invention provides the application of a kind of full photo threshold device based on two-dimensional material wavelength convert function,
Based on two-dimensional material wavelength convert function full photo threshold device described in described first aspect is used for all-optical signal processing process
The method of noise in middle reduction light pulse signal, comprises the following steps:
(1) draw the saturated absorption curve of saturated absorbing body, obtain according to described saturated absorption curve described
The average threshold power of saturated absorbing body and average saturation power；
(2) average threshold power and the described average saturation power of described saturated absorbing body are converted into peak threshold power
With peak value saturation power；
(3) image intensifer light pulse signal to receiving is used to carry out power amplification, it is thus achieved that the light pulse letter after amplification
Number, the peak power of the light pulse signal after described amplification is more than or equal to peak value saturation power and the optical fiber coupling of saturated absorbing body
The insertion loss sum of clutch；
(4) after the light pulse signal input after optical signal to be detected and described amplification to fiber coupler coupling
Inputting to saturated absorbing body, in the light pulse signal after described amplification, the peak value more than or equal to described saturated absorbing body is satisfied again
Treat that light signal is modulated with the signal of power to described, make signal be positioned at the light carrier at described light pulse signal from wavelength
It is transformed into wavelength to be positioned on the light carrier at described optical signal to be detected；Less than peak threshold power in described light pulse signal
Ground noise signal is absorbed strongly by described saturated absorbing body, it is impossible to treats light signal and is modulated, through described saturated suction
Mixed light after acceptor includes light pulse signal and the optical signal to be detected modulated simultaneously；Described mixed light is inputted
Carrying out wavelength selection to optical filter, described optical filter allows the wavelength component of the optical signal to be detected modulated
Pass through, and the wavelength component of light pulse signal is filtered out；The ground noise signal in described light pulse signal is finally made to be suppressed.
The application of based on two-dimensional material wavelength convert function the full photo threshold device that third aspect present invention provides, described
Full photo threshold device based on two-dimensional material wavelength convert function can be used for all-optical signal processing, thus reduces in light pulse signal
Noise.
To sum up, beneficial effect of the present invention includes the following aspects:
1, based on two-dimensional material wavelength convert function the full photo threshold device that the present invention provides, structure is very simple, surely
Qualitative preferably, cost is relatively low.This full photo threshold device improves the signal to noise ratio receiving signal, improves signal quality, is conducive to
Improve optical communication system and receive judgement performance；
2, the preparation method of based on two-dimensional material wavelength convert function the full photo threshold device that the present invention provides is simple, easily
Operation；
3, based on two-dimensional material wavelength convert function the full photo threshold device that the present invention provides may be used for All-optical signal
Process, thus reduce the noise in light pulse signal.
Accompanying drawing explanation
Based on two-dimensional material wavelength convert function the full photo threshold device architecture that Fig. 1 provides for an embodiment of the present invention
Schematic diagram；
The microstructure schematic diagram of the saturated absorbing body that Fig. 2 provides for an embodiment of the present invention；
The structure chart of the saturated absorbing body that Fig. 3 provides for an embodiment of the present invention；
The saturated absorption curve test schematic diagram of the saturated absorbing body that Fig. 4 provides for an embodiment of the present invention；
The saturated absorption curve chart of the saturated absorbing body that Fig. 5 provides for an embodiment of the present invention；
Fig. 6 is that full photo threshold device based on two-dimensional material wavelength convert function reduces during all-optical signal processing
The effect schematic diagram of noise in light pulse signal.
Detailed description of the invention
The following stated is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.
First aspect present invention provides a kind of full photo threshold device based on two-dimensional material wavelength convert function, including light
Pulse signal source, image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, image intensifer
Being provided with the first end and the second end, fiber coupler is provided with first input end, the second input and outfan, and saturated absorbing body is provided with
3rd end and the 4th end, the first end is connected with light pulse signal source, and the second end is connected with first input end, optical signal source to be detected
Be connected with the second input, light pulse signal source produce light pulse signal through image intensifer amplify after with optical signal source to be detected
The optical signal to be detected produced together enters fiber coupler and couples, and the mixed light formed after coupling is defeated by outfan
Going out, outfan and three-terminal link, the 4th end is connected with optical filter, and saturated absorbing body includes fiber waveguide and is coated on light
The two-dimensional material of waveguide surface, saturated absorbing body has wavelength convert function, for suppressing the noise in light pulse signal.
In an embodiment of the present invention, two-dimensional material includes Graphene, black phosphorus, topological insulator and transient metal sulfide
In at least one.
In the present invention one preferred implementation, topological insulator includes Bi2Te3、Bi2Se3And Sb2Te3In at least one.
In the present invention one preferred implementation, transient metal sulfide includes at least in molybdenum bisuphide and tungsten disulfide
Kind.
In the present invention one preferred implementation, the size of two-dimensional material is that industry routine selects, and it is special not do at this
Limit.
In an embodiment of the present invention, light pulse signal source is used for producing light pulse signal.
In an embodiment of the present invention, light pulse signal source is the optical fiber telecommunications system that can produce light pulse signal.
In an embodiment of the present invention, image intensifer is erbium doped optical fibre light amplifier (EDFA) or semiconductor optical amplifier
(SOA)。
In an embodiment of the present invention, light pulse signal peak power after image intensifer amplifies is more than or equal to saturated
The peak value saturation power of absorber.
In the present invention one preferred implementation, light pulse signal peak power after image intensifer amplifies is more than or equal to
The peak value saturation power of saturated absorbing body and the insertion loss sum of fiber coupler.Also need owing to light pulse signal is follow-up through
Fiber coupler, it is contemplated that fiber coupler can exist certain insertion loss, and therefore, light pulse signal amplifies through image intensifer
After peak power more than or equal to the insertion loss sum of peak value saturation power and the fiber coupler of saturated absorbing body.
In an embodiment of the present invention, light pulse signal source is connected by optical fiber with image intensifer.
In the present invention one preferred implementation, optical fiber is single-mode fiber.
Complete its ultimate principle of photo threshold device of the present invention is the wavelength convert function utilizing two-dimensional material, and wavelength convert
The realization of function depends on the saturated absorption that two-dimensional material is unique, finally realizes the full light shaping effect of signal, therefore needs
Rationally to arrange parameter makes incident light pulse signal (also referred to as switching light) be operated in saturated absorption region.The present invention makes
With image intensifer, light pulse signal is rationally amplified so that the optical signal power level after amplification is just at two-dimensional material
The zone of action of saturated absorption, i.e. light pulse signal central peak power reach the saturation power point of two-dimensional material, almost
Transparent pass through, and lower powered ground noise is in below threshold power point, is strongly inhibited.
Light pulse signal is amplified into fiber coupler through image intensifer.
In an embodiment of the present invention, image intensifer is connected by optical fiber with fiber coupler.
In the present invention one preferred implementation, optical fiber is single-mode fiber.
In an embodiment of the present invention, the optical signal to be detected that optical signal source to be detected produces is continuous wave.
Optical signal source to be detected produce optical signal to be detected with amplification after light pulse signal entered by fiber coupler
Row coupling, obtains mixed light after coupling.
In an embodiment of the present invention, the coupling ratio of fiber coupler is 50:50.
In an embodiment of the present invention, mixed light is exported by outfan, enters in saturated absorbing body.
In an embodiment of the present invention, fiber coupler is connected by optical fiber with saturated absorbing body.
In the present invention one preferred implementation, optical fiber is single-mode fiber.
Optical signal to be detected passes through to enter together with fiber coupler with the light pulse signal after amplifying to have wrapped up two
The fiber waveguide of dimension material, is more than or equal to the signal of the peak value saturation power of saturated absorbing body in the light pulse signal after amplification
(i.e. switching light), by the absorption to optical signal to be detected of the saturated two-dimensional material saturated absorbing body, makes optical signal to be detected obtain this
The structure transparent (i.e. being modulated) in light pulse signal time domain.I.e. light-metering to be checked in this switch optical time domain can be by saturated
Absorber and switch signal entrained by light transfer to light-metering to be checked from switch light.This beneficial effect is referred to as wavelength convert
Function, i.e. signal are positioned at the light carrier at intense pulsed light from wavelength and are transformed into wavelength and are positioned on the light carrier at light-metering to be checked.Only
Optical signal to be detected just can be modulated by the light pulse signal having high-peak power, and lower powered ground noise can not be right
Treat that light signal is modulated.Mixed light after two-dimensional material saturated absorbing body includes light pulse signal and quilt simultaneously
The optical signal to be detected modulated.Optical signal can pass through optical filter and reach photodetector judgement recovery, and right
Low-power ground noise in side realizes wavelength convert owing to failing, it is impossible to through optical filter thus significantly pressed down
System, reduces the ground noise interference for useful signal, plays and improve signal quality, and the noise improving reception optical signal is compared to
With, finally improve the bit error rate performance of reception system.
In an embodiment of the present invention, fiber waveguide is micro-nano fiber or nano wire.
In the present invention one preferred implementation, a diameter of industry routine of micro-nano fiber selects, and does not do particular determination at this.
In the present invention one preferred implementation, nano wire includes semiconductor nanowires.
In the present invention one preferred implementation, a diameter of industry routine of nano wire selects, and does not do particular determination at this.
In the present invention one preferred implementation, when fiber waveguide is nano wire, optical fiber and nano wire are by the way of coupling
Connecting, concrete coupled modes are that industry routine selects.
Two-dimensional material is coated in fiber waveguide formation saturated absorbing body by the present invention, and this fiber waveguide can be with optical fiber telecommunications system
Compatibility, so that this full photo threshold device can be compatible with optical fiber telecommunications system, this full photo threshold device architecture is simple, stable
Property is strong.
In an embodiment of the present invention, mixed light enters optical filter from saturated absorbing body.
In an embodiment of the present invention, saturated absorbing body and optical filter are connected by optical fiber.
In the present invention one preferred implementation, optical fiber is single-mode fiber.
This optical filter allows the wavelength component treating light signal to pass through, and the wavelength component switching light is filtered out, because of
This mixed light after two-dimensional material saturated absorbing body, after by optical filter, finally gives treating through ovennodulation
Light signal.Its effect is to achieve wavelength convert function, and i.e. switch signal entrained by light is from switch optical wavelength composition transfer
To optical wavelength composition to be measured.
In an embodiment of the present invention, optical filter is band filter or band elimination filter.
The wavelength convert function that two-dimensional material saturated absorbing body is had by the present invention is used for full photo threshold, exactly plays ripple
" low-resistance high pass " effect of long translation function, by the light pulse signal that optical communication system received after rationally amplifying
(as switch light) couples with another light beam (as light-metering to be checked), and the mixed light after coupling sends into two-dimensional material cladding
Optical waveguide on (such as micro-nano fiber, but be not limited to micro-nano fiber), wavelength based on two-dimensional material saturated absorbing body turns
Change function, only just produced when switching light pulse power and being stronger, i.e. signal could be tested in new wavelength component
Measure, and be difficult to when optical power ratio is more weak produce, i.e. signal can not be transformed in new wavelength component.The most again through a light
Learning wave filter, this wave filter can allow the wavelength components of light-metering to be checked pass through, and the wavelength components switching light is filtered out, through filtering
Optical signal after ripple is exactly to have passed through the optical signal after wavelength convert function.Owing to receiving the low power noise substrate of signal
It is unsatisfactory for the condition of wavelength convert and is suppressed greatly, possess the signal of high-peak power itself then owing to having reached ripple
The condition of long translation function can be detected, and eventually enters into detector judgement and recovers, and therefore the quality of signal is improved, letter
Making an uproar ratio lifting, the receptivity of optical communication system is improved.This is All-optical signal shaping operation in a way, meets work
Being the exemplary functions feature of a threshold device, the biggest signal is detected, and small-signal is suppressed.Additionally, due to use and optical fiber
Transmission waveguide that communication system is compatible (such as micro-nano fiber, but it is not limited to micro-nano fiber), whole threshold device simple in construction,
Good stability.
In an embodiment of the present invention, this full photo threshold device can be connected with photoreceiver.
Based on two-dimensional material wavelength convert function the full photo threshold device architecture that Fig. 1 provides for an embodiment of the present invention
Schematic diagram；Such as Fig. 1, in Fig. 1,2,4,6,8 represent to communicate with 10 and use single-mode fiber；1 represents light pulse signal source, and 3 represent light amplification
Device, 5 represent optical signal source to be detected, and 7 represent fiber coupler, and 9 represent saturated absorbing body, and 11 represent optical filter, in figure
Arrow represent optical propagation direction.The light pulse signal come in from optical fiber telecommunications system (i.e. light pulse signal source 1) input contains
Ground noise, first these optical signals are admitted to image intensifer 3 (such as EDFA) by optical fiber 2 and are amplified, after amplifying
The optical signal to be detected that optical signal is produced with optical signal source to be detected by optical fiber 4 enters fiber coupler together with optical fiber 6
7, form mixed light through the coupling of fiber coupler 7, optical signal to be detected and light pulse signal, mixed light passes through optical fiber
8 enter saturated absorbing bodies 9, due to the micro-nano fiber in saturated absorbing body or the strong evanescent wave effect of nanowire surface and power
Density strengthens the two-dimensional material making light and be coated on light guide surface and strong nonlinear interaction occurs, and creates saturated absorption
Effect, more than or equal to the signal of the peak value saturation power of saturated absorbing body by saturated two dimension material in the light pulse signal after amplification
Material saturated absorbing body treats the absorption of light signal, makes to treat that light signal obtains saturating in light pulse signal time domain of this structure
Bright (i.e. being modulated).And lower powered ground noise can not be treated light signal and be modulated.Through two-dimensional material saturated absorption
Mixed light after body include simultaneously light pulse signal and modulated treat light signal；This saturated absorbing body will be to sending
The light pulse signal entered carries out full photo threshold effect, hence it is evident that restrain ground noise；Eventually pass the light arteries and veins of full photo threshold shaping
Rushing signal and enter optical filter 11 by optical fiber 10, this optical filter allows the wavelength component treating light signal to pass through, and
The wavelength component of switch light is filtered out, and therefore the mixed light after two-dimensional material saturated absorbing body is passing through optical filter
Afterwards, finally give and treat light signal through ovennodulation.Its effect is to achieve wavelength convert function, i.e. entrained by switch light
Signal transfers to optical wavelength composition to be measured from switch optical wavelength composition.Owing to the light pulse signal of only high-peak power could be real
Existing wavelength convert, and lower powered noise floor can not produce wavelength convert, therefore by detecting new wavelength component
Realize the full photo threshold shaping operation of suppression noise, it is possible to substantially restrain ground noise；Eventually pass full photo threshold shaping
Light pulse signal enters the photodetector of receiver, is converted into the signal of telecommunication and is received judgement.
The microstructure schematic diagram of the saturated absorbing body that Fig. 2 provides for an embodiment of the present invention；Fig. 3 is that the present invention one is real
The structure chart of the saturated absorbing body that the mode of executing provides；In Fig. 2 and Fig. 3,91 represent fiber waveguide, and 92 representatives are coated on light guide surface
Two-dimensional material.It can be seen that the saturated absorbing body that the present invention provides includes fiber waveguide and is coated on light wave from Fig. 2 and Fig. 3
Lead the two-dimensional material on surface.The present invention will be provided with the two-dimensional material of wavelength convert function and is wrapped in fiber waveguide, passes through fiber waveguide
The strong evanescent wave effect on surface and power density strengthen the two-dimensional material making light and be coated on light guide surface and occur strong
Nonlinear interaction.This nonlinear interaction show themselves in that the relatively low light ground noise signal of power to input absorbs strongly, pass through
Rate is relatively low, and the nearly transparent transmission of optical signal of the high-peak power for input.
The present invention utilizes the wavelength convert function (i.e. saturated absorption) of two-dimensional material to realize full photo threshold effect, fall
The low ground noise interference for useful signal, plays and improves signal quality, improves the signal to noise ratio effect receiving optical signal,
Improve the bit error rate performance of reception system eventually.Full photo threshold device proposed by the invention has simple in construction, good stability
Advantage.
Based on two-dimensional material wavelength convert function the full photo threshold device that first aspect present invention provides, this full photo threshold
Device architecture is very simple, and cost is relatively low.It addition, full photo threshold device need not to use nonlinear optical fiber or costliness
PPLN semiconductor device, thus avoid and use the loss that brings of nonlinear optical fiber relatively big and the defect of poor stability and cost
Higher defect.This full photo threshold device may be used for improving the signal to noise ratio receiving signal, improves signal quality, is conducive to improving
Optical communication system receives judgement performance.
Second aspect present invention provides the preparation of a kind of full photo threshold device based on two-dimensional material wavelength convert function
Method, comprises the following steps:
Two-dimensional material is coated on light guide surface, forms saturated absorbing body；
Thering is provided light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is put
Big device is provided with the first end and the second end, and fiber coupler is provided with first input end, the second input and outfan, saturated absorbing body
Being provided with the 3rd end and the 4th end, the first end is connected with light pulse signal source, and the second end is connected with first input end, and light-metering to be checked is believed
Number source is connected with the second input, outfan and three-terminal link, and the 4th end is connected with optical filter, is formed based on two dimension material
The full photo threshold device of material wavelength convert function.
In an embodiment of the present invention, the method that two-dimensional material is coated on light guide surface does not limits, such as, can adopt
By the method for optical fiber optical tweezers or tear tape, two-dimensional material being coated on light guide surface, these methods are the conventional selection of industry.
The preparation method of based on two-dimensional material wavelength convert function the full photo threshold device that second aspect present invention provides
Simply, easily operate.
Third aspect present invention provides the application of a kind of full photo threshold device based on two-dimensional material wavelength convert function,
The present invention full photo threshold device based on two-dimensional material wavelength convert function is used for all-optical signal processing.
In an embodiment of the present invention, full photo threshold device is for carrying out shaping by the optical signal of photoreceiver to be entered.
In the present invention one preferred implementation, before all-optical signal processing is positioned at the photodetector of photoreceiver.
The present invention full photo threshold device reduces the ground noise interference for useful signal, plays and improves signal quality,
Improving the signal to noise ratio effect receiving optical signal, the light pulse signal eventually passing full photo threshold shaping enters the light electrical resistivity survey of receiver
Survey device, be converted into the signal of telecommunication and be received judgement, improve the bit error rate performance of receiver.
The full photo threshold device that the present invention provides, its cardinal principle is that the wavelength convert function utilizing two-dimensional material realizes
The full light shaping effect of signal, it is therefore desirable to parameter is rationally set and makes incident light pulse be operated in saturated absorption region.
In an embodiment of the present invention, full photo threshold device based on two-dimensional material wavelength convert function is used for All-optical signal
Processing procedure reduces the method for noise in light pulse signal, comprises the following steps:
(1) draw the saturated absorption curve of saturated absorbing body, obtain saturated absorption according to saturated absorption curve
The average threshold power of body and average saturation power；
(2) by the average threshold power of saturated absorbing body with average saturation power is converted into peak threshold power and peak value is satisfied
And power；
(3) image intensifer light pulse signal to receiving is used to carry out power amplification, it is thus achieved that the light pulse letter after amplification
Number, the peak power of the light pulse signal after amplification is more than or equal to peak value saturation power and the fiber coupler of saturated absorbing body
Insertion loss sum；
(4) will optical signal to be detected and the light pulse signal input after amplifying to the most defeated after fiber coupler couples
Enter to saturated absorbing body, the light pulse signal after amplification is more than or equal to the signal of the peak value saturation power of saturated absorbing body
Optical signal to be detected is modulated, makes signal be positioned at the light carrier at light pulse signal from wavelength and be transformed into wavelength and be positioned to be checked
On light carrier at light signal, light pulse signal is saturated absorber less than the ground noise signal of peak threshold power strong
Strong absorption, it is impossible to be modulated optical signal to be detected, the mixed light after saturated absorbing body includes light pulse simultaneously
Signal and the optical signal to be detected modulated；Mixed light input is carried out wavelength selection, optically filtering to optical filter
Device allows the wavelength component of the optical signal to be detected modulated to pass through, and the wavelength component of light pulse signal is filtered out；Finally
The ground noise signal in light pulse signal is made to be suppressed.
In the present invention one preferred implementation, in step (1), the saturated absorption being measured saturated absorbing body by experiment is imitated
Answering curve, the power working region for optical signal provides foundation.In step (1), saturated absorption curve experiments test process is such as
Shown in Fig. 4.The saturated absorption curve experiments test signal of the saturated absorbing body that Fig. 4 provides for an embodiment of the present invention
Figure.In figure, 13,15,17,19,20 all represent to communicate with 23 and use single-mode fiber.
As shown in Figure 4, its test process is: the light pulse signal that pulse laser 12 sends is through high power EDFA 14
Send into variable optical attenuator 16 after amplification, regulated by the decay size regulating tunable attenuator 16 and input to be coated with
The luminous power size of the saturated absorbing body SA of two-dimensional material, in order to test out saturated absorption curve, light pulse signal passes through
The photo-coupler 18 through 1 × 2 is also needed after variable optical attenuator 16, before inputing to saturated absorbing body, therein one
Individual port exports and is used as monitoring input optical power size to light power meter 22, and another one port inputs to saturated absorbing body 21,
Outfan at saturated absorbing body 21 reconnects a light power meter 24 and is used for monitoring Output optical power size.According to output light merit
Rate size draws saturated absorption curve, and saturated absorption curve synoptic diagram is as shown in Figure 5.Fig. 5 is the present invention one enforcement
The saturated absorption curve chart that mode provides.Threshold point P can be drawn by saturated absorption curvea,thWith saturation point Pa,sa。
In the present invention one preferred implementation, in step (2), test out saturated absorption curve, needed light arteries and veins
The average light power rushing signal is converted into peak optical powers, and its process is: if the pulsewidth of pulse laser is W, pulse laser
The cycle of device is T, and average light power is Pa, then peak optical powers PpFor:
Pp=Pa×T/W (1)
Saturated absorption curve corresponding peak threshold power P can be drawn by formula (1)p,thWith peak value saturation power Pp,sa:
Pp,th=Pa,th×T/W (2)
Pp,sa=Pa,sa×T/W (3)
In the present invention one preferred implementation, in step (3), draw the peak value of saturated absorption curve and correspondence
Power, the light pulse signal received system with image intensifer to being required for property carries out power amplification, and its process is: if
The optical signal pulsewidth that system receives is Ws, the signal period is Ts, for making peak power reach the peak of saturated absorption curve
Value saturation power Pp,sa, need with image intensifer EDFA, light pulse signal to be amplified, the average light power P after amplificationa,EDFA
It suffices that:
Pa,EDFA≥Pp,sa×Ws/Ts (4)
It is contemplated that employ fiber coupler in structure configuration, can there is certain insertion loss in fiber coupler,
Assume that this loss is L, with image intensifer EDFA, light pulse signal is amplified, then the average light after final required amplification
Power Pa,EDFAIt suffices that:
Pa,EDFA≥Pp,sa×Ws/Ts+L (5)
Formula (5) is that the output of the essential condition that can reach full photo threshold effect, only image intensifer meets public affairs
Formula (5), just can make the absorption to another light beam (light-metering the most to be checked) of intense pulsed light (i.e. switching light) the saturated two-dimensional material, make to treat
Detection light obtains this structure transparent (i.e. being modulated) in switch optical time domain, and this mixed light is again by an optical filter
Being filtered by switch light component, that is modulated treats that light signal is nearly transparent and passes through, and makes ground noise signal be suppressed, finally realizes
Wavelength convert function, has given play to the wavelength convert ability as full photo threshold shaping.
Based on two-dimensional material wavelength convert function the full photo threshold device that third aspect present invention provides may be used for entirely
Optical signal prosessing, thus reduce the noise in optical signal, improve the signal to noise ratio receiving signal, improve signal quality, favorably
Judgement performance is received in improving optical communication system.
Embodiment 1
A kind of full photo threshold device based on two-dimensional material wavelength convert function, including light pulse signal source, Er-doped fiber
Image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, image intensifer is provided with the first end
With the second end, fiber coupler is provided with first input end, the second input and outfan, and saturated absorbing body is provided with the 3rd end and
Four ends, the first end is connected with light pulse signal source, and the second end is connected with first input end, optical signal source to be detected and the second input
End connects, and the light pulse signal that light pulse signal source produces is to be checked with what optical signal source to be detected produced after image intensifer amplifies
Light signal together enters fiber coupler and couples, after coupling formed mixed light export by outfan, outfan and
Three-terminal link, the 4th end is connected with optical filter, and saturated absorbing body includes micro-nano fiber and is coated on micro-nano fiber table
The Graphene in face, saturated absorbing body has wavelength convert function, for suppressing the noise in light pulse signal.
Embodiment 2
A kind of full photo threshold device based on two-dimensional material wavelength convert function, including light pulse signal source, semiconductor light
Amplifier, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, image intensifer be provided with the first end and
Second end, fiber coupler is provided with first input end, the second input and outfan, and saturated absorbing body is provided with the 3rd end and the 4th
End, the first end is connected with light pulse signal source, and the second end is connected with first input end, optical signal source to be detected and the second input
Connecting, the light pulse signal that light pulse signal source produces is to be detected with what optical signal source to be detected produced after image intensifer amplifies
Optical signal together enters fiber coupler and couples, and the mixed light formed after coupling is exported by outfan, outfan and the
Three-terminal link, the 4th end is connected with optical filter, and saturated absorbing body includes micro-nano fiber and is coated on micro-nano fiber surface
Black phosphorus, saturated absorbing body has wavelength convert function, for the noise suppressing in light pulse signal.
Embodiment 3
A kind of full photo threshold device based on two-dimensional material wavelength convert function, including light pulse signal source, Er-doped fiber
Image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, image intensifer is provided with the first end
With the second end, fiber coupler is provided with first input end, the second input and outfan, and saturated absorbing body is provided with the 3rd end and
Four ends, the first end is connected with light pulse signal source, and the second end is connected with first input end, optical signal source to be detected and the second input
End connects, and the light pulse signal that light pulse signal source produces is to be checked with what optical signal source to be detected produced after image intensifer amplifies
Light signal together enters fiber coupler and couples, after coupling formed mixed light export by outfan, outfan and
Three-terminal link, the 4th end is connected with optical filter, and saturated absorbing body includes semiconductor nanowires and is coated on quasiconductor
The Bi of nanowire surface2Te3, saturated absorbing body has wavelength convert function, for suppressing the noise in light pulse signal.
Embodiment 4
A kind of full photo threshold device based on two-dimensional material wavelength convert function, including light pulse signal source, Er-doped fiber
Image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, image intensifer is provided with the first end
With the second end, fiber coupler is provided with first input end, the second input and outfan, and saturated absorbing body is provided with the 3rd end and
Four ends, the first end is connected with light pulse signal source, and the second end is connected with first input end, optical signal source to be detected and the second input
End connects, and the light pulse signal that light pulse signal source produces is to be checked with what optical signal source to be detected produced after image intensifer amplifies
Light signal together enters fiber coupler and couples, after coupling formed mixed light export by outfan, outfan and
Three-terminal link, the 4th end is connected with optical filter, and saturated absorbing body includes semiconductor nanowires and is coated on quasiconductor
The molybdenum bisuphide of nanowire surface, saturated absorbing body has wavelength convert function, for suppressing the noise in light pulse signal.
Embodiment 5
The preparation method of a kind of full photo threshold device based on two-dimensional material wavelength convert function, comprises the following steps:
Graphene is deposited by the method for optical fiber optical tweezers, is coated on the surface of micro-nano fiber, forms saturated absorbing body；
Thering is provided light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is put
Big device is provided with the first end and the second end, and fiber coupler is provided with first input end, the second input and outfan, saturated absorbing body
Being provided with the 3rd end and the 4th end, the first end is connected by single-mode fiber with light pulse signal source, and the second end leads to first input end
Crossing single-mode fiber to connect, optical signal source to be detected and the second input are connected by single-mode fiber, and outfan and the 3rd end pass through
Single-mode fiber connects, and the 4th end is connected by single-mode fiber with optical filter, is formed based on two-dimensional material wavelength convert function
Full photo threshold device.
Embodiment 6
The preparation method of a kind of full photo threshold device based on two-dimensional material wavelength convert function, comprises the following steps:
By the method for tear tape method by graphene coated on the surface of semiconductor nanowires, form saturated absorbing body；
Thering is provided light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is put
Big device is provided with the first end and the second end, and fiber coupler is provided with first input end, the second input and outfan, saturated absorbing body
Being provided with the 3rd end and the 4th end, the first end is connected by single-mode fiber with light pulse signal source, and the second end leads to first input end
Crossing single-mode fiber to connect, optical signal source to be detected and the second input are connected by single-mode fiber, and outfan and the 3rd end pass through
Single-mode fiber connects, and the 4th end is connected by single-mode fiber with optical filter, and wherein, semiconductor nanowires leads to single-mode fiber
The mode of overcoupling connects, and forms full photo threshold device based on two-dimensional material wavelength convert function.
Effect example
Based on two-dimensional material wavelength convert function the full photo threshold device that embodiment 1 prepares is used for all-optical signal processing
During reduce noise in light pulse signal, Fig. 6 is that full photo threshold device based on two-dimensional material wavelength convert function is for entirely
Reducing the effect schematic diagram of noise in light pulse signal during optical signal prosessing, in figure, 25 represent the light pulse signal after amplifying
In more than or equal to the signal of peak value saturation power of saturated absorbing body；26 substrates represented in the light pulse signal after amplifying are made an uproar
Sound；27 represent optical signal to be detected (continuous wave), and different wavelength components is represented by dashed line, lower same；28 represent wavelength convert it
After the segment pulse of the optical signal to be detected modulated；29 represent wavelength convert after the optical signal to be detected modulated
Ground noise part.From fig. 6 it can be seen that light pulse signal (switch light) send after amplifying together with signal 27 to be detected
Entering after two-dimensional material saturated absorbing body completes wavelength convert function, the signal being originally carried on switch optical wavelength component is turned
Move on wavelength of optical signal component to be detected, and the peak value saturation power being in saturated absorbing body in original light pulse signal is attached
Near pulse signal 25 is almost become wavelength to be positioned at the pulse signal 28 at wavelength of optical signal component to be detected by slavish copying, and locates
Ground noise 26 near the peak threshold power of saturated absorbing body is suppressed greatly, becomes wavelength and is positioned at and treats that light-metering is believed
Ground noise 29 at number wavelength component.Therefore, the full photo threshold based on two-dimensional material wavelength convert function that the present invention provides
Device can reduce noise in light pulse signal, improves the quality of signal.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that, for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a full photo threshold device based on two-dimensional material wavelength convert function, it is characterised in that include light pulse signal source,
Image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, described image intensifer is provided with
One end and the second end, described fiber coupler is provided with first input end, the second input and outfan, and described saturated absorbing body sets
The 3rd end and the 4th end, described first end is had to be connected with described light pulse signal source, described second end and described first input end
Connecting, described optical signal source to be detected is connected with described second input, the light pulse signal that described light pulse signal source produces
The optical signal to be detected produced with described optical signal source to be detected after described image intensifer amplifies together enters described optical fiber coupling
Clutch couples, and the mixed light formed after coupling is exported by described outfan, described outfan and described three-terminal link,
Described 4th end is connected with described optical filter, and described saturated absorbing body includes fiber waveguide and is coated on light guide surface
Two-dimensional material, described saturated absorbing body has wavelength convert function, for suppressing the noise in described light pulse signal.
2. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Two-dimensional material includes at least one in Graphene, black phosphorus, topological insulator and transient metal sulfide.
3. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Fiber waveguide is micro-nano fiber or nano wire.
4. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Image intensifer is erbium doped optical fibre light amplifier or semiconductor optical amplifier.
5. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Optical signal to be detected is continuous wave.
6. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Optical filter is band filter or band elimination filter.
7. full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 1, it is characterised in that described
Light pulse signal peak power after described image intensifer amplifies is more than or equal to the saturated merit of peak value of described saturated absorbing body
Rate and the insertion loss sum of described fiber coupler.
8. the preparation method of a full photo threshold device based on two-dimensional material wavelength convert function, it is characterised in that include with
Lower step:
Two-dimensional material is coated on the surface of fiber waveguide, forms saturated absorbing body；
Thering is provided light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, described light is put
Big device is provided with the first end and the second end, and described fiber coupler is provided with first input end, the second input and outfan, described full
Being provided with the 3rd end and the 4th end with absorber, described first end is connected with described light pulse signal source, and described second end is with described
First input end connects, and described optical signal source to be detected is connected with described second input, described outfan and described 3rd end
Connecting, described 4th end is connected with described optical filter, forms full photo threshold device based on two-dimensional material wavelength convert function
Part.
9. the preparation method of full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 8, it is special
Levy and be, use the method for optical fiber optical tweezers or the method for tear tape that described two-dimensional material is coated on the table of described fiber waveguide
Face.
10. based on two-dimensional material wavelength convert function the full photo threshold device as described in any one of claim 1-7 is for complete
Reduce the method for noise in light pulse signal during optical signal prosessing, comprise the following steps:
(1) draw the saturated absorption curve of saturated absorbing body, obtain described saturated according to described saturated absorption curve
The average threshold power of absorber and average saturation power；
(2) average threshold power and the described average saturation power of described saturated absorbing body are converted into peak threshold power and peak
Value saturation power；
(3) image intensifer light pulse signal to receiving is used to carry out power amplification, it is thus achieved that the light pulse signal after amplification, institute
The peak power stating the light pulse signal after amplification is more than or equal to peak value saturation power and the fiber coupler of saturated absorbing body
Insertion loss sum；
(4) by the input of the light pulse signal after optical signal to be detected and described amplification to the most defeated after fiber coupler couples
Enter to saturated absorbing body, more than or equal to the saturated merit of peak value of described saturated absorbing body in the light pulse signal after described amplification
Described optical signal to be detected is modulated by the signal of rate, and the light carrier making signal be positioned at described light pulse signal from wavelength turns
Change to wavelength be positioned on the light carrier at described optical signal to be detected；Less than the base of peak threshold power in described light pulse signal
Back noise signal is absorbed strongly by described saturated absorbing body, it is impossible to be modulated optical signal to be detected, through described saturated suction
Mixed light after acceptor includes light pulse signal and the optical signal to be detected modulated simultaneously；Described mixed light is inputted
Carrying out wavelength selection to optical filter, described optical filter allows the wavelength component of the optical signal to be detected modulated
Pass through, and the wavelength component of light pulse signal is filtered out；The ground noise signal in described light pulse signal is finally made to be suppressed.
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| CN107085268A (en) * | 2017-06-13 | 2017-08-22 | 苏州艾力光电科技有限公司 | A kind of optically coupled device |
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| CN112615246A (en) * | 2020-12-15 | 2021-04-06 | 中国科学院长春光学精密机械与物理研究所 | Main oscillation power amplifier based on graphene |
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| CN103368059A (en) * | 2013-07-23 | 2013-10-23 | 上海交通大学 | Graphene-based reflective type saturable absorber and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085268A (en) * | 2017-06-13 | 2017-08-22 | 苏州艾力光电科技有限公司 | A kind of optically coupled device |
| CN108594479A (en) * | 2018-03-30 | 2018-09-28 | 张晗 | It is a kind of based on the full optical phase modulator of black phosphorus material and its application |
| WO2019184203A1 (en) * | 2018-03-30 | 2019-10-03 | 张晗 | Black phosphorus material-based all-optical phase modulator and application thereof |
| CN112615246A (en) * | 2020-12-15 | 2021-04-06 | 中国科学院长春光学精密机械与物理研究所 | Main oscillation power amplifier based on graphene |
| CN112615246B (en) * | 2020-12-15 | 2021-09-03 | 中国科学院长春光学精密机械与物理研究所 | Main oscillation power amplifier based on graphene |
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