CN106226970B - A kind of full photo threshold device and its preparation method and application based on two-dimensional material wavelength convert function - Google Patents
A kind of full photo threshold device and its preparation method and application based on two-dimensional material wavelength convert function Download PDFInfo
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- CN106226970B CN106226970B CN201610649716.3A CN201610649716A CN106226970B CN 106226970 B CN106226970 B CN 106226970B CN 201610649716 A CN201610649716 A CN 201610649716A CN 106226970 B CN106226970 B CN 106226970B
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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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- G02F1/00—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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- H—ELECTRICITY
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Abstract
The present invention provides a kind of full photo threshold devices 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 equipped with first end and second end, fiber coupler is equipped with first input end, second input terminal and output end, saturated absorbing body is equipped with third end and the 4th end, first end is connect with light pulse signal source, second end is connect with first input end, optical signal source to be detected is connect with the second input terminal, the light pulse signal that light pulse signal source generates enters fiber coupler together with the light signal to be checked that optical signal source to be detected generates after image intensifer amplifies and is coupled, the mixed light formed after coupling is exported by output end, output end is connect with third end, 4th end is connect with optical filter, saturation is inhaled Acceptor includes optical waveguide and the two-dimensional material for being coated on light guide surface.The 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 fields, and in particular to a kind of full light threshold based on two-dimensional material wavelength convert function
It is worth device and its preparation method and application.
Background technique
All-optical signal processing is the important development trend and research direction of optical fiber telecommunications system.It is being based on zero code
In (Return to Zero, RZ) or the digital optical communication system of burst pulse, such as in 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, often all there is a certain amount of ground noise in the light pulse signal that system receiving terminal receives,
Such as spontaneous emission noise (ASE noise), multiple access interference noise (MAI noise) that amplifier is introduced etc., and it is this
Severe exacerbation is received the signal-to-noise ratio of light pulse signal by the presence of interference noise, is received judgement difficulty and is increased, tolerance reduces, and deteriorates
The receiving sensitivity of receiver eventually affects the signal receiving performance of digital optical communication system.Therefore, how to eliminate including
Noise floor including MAI noise is a critical issue in light multiple access to communication system.
Full photo threshold technology is one of the key technology eliminated in MAI noise, and in recent years, this technology causes academia
Extensive concern.Currently, being suggested there are many photo threshold technology, wherein most commonly seen method is to utilize optical fiber or semiconductor
For nonlinear effect in medium come what is realized, realization principle mainly includes based on self phase modulation (SPM), cross-phase tune
Effect (XPM) processed and second_harmonic generation (SHG).The core concept of these methods is: the information signal of receiving end generally has
There is sufficiently high Instantaneous peak power, nonlinear effect can be generated in nonlinear dielectric, by generating new frequency component, makes
Information signal is obtained to be saved；And the ground noises such as MAI are not enough to generate nonlinear effect because power is lower, thus work as it
It will be filtered out when by nonlinear dielectric.
Threshold technology based on SPM and XPM usually requires longer nonlinear optical fiber, and the larger and stability of loss is poor,
It is based particularly on the scheme of XPM, higher simultaneously in required optical power, system structure is also extremely complex.
In order to simplify the system structure of threshold technology while reduce required optical signal power, there is scholar to propose and utilize week
SHG effect realizes the scheme of threshold value judgement in phase poled lithium niobate (PPLN) crystal, and the PPLN in system is a kind of novel
High non-linearity semiconductor devices, in the pulse signal input PPLN with MAI noise, correct symbol pulses have enough peaks
SHG effect will be generated when PPLN is transmitted by being worth power light pulses, and the peak power of MAI noise is not enough to generate SHG effect, leads to
It crosses two frequency-doubled signals that will be generated in PPLN and filters out and threshold value judgement can be realized, however the optical signal of SHG wavelength will be difficult to
Transmission and processing are realized in optical fiber.To solve this problem, it is thus proposed that the technical solution that combines SHG with XPM.?
In PPLN under the action of XPM effect, two frequency doubled lights that SHG is generated will be converted to C-band, with the threshold technology for being based solely on SHG
It compares, the cost of implementation and complexity of this improved threshold technology greatly improve.At the same time, PPLN is as a kind of novel
Semiconductor devices, cost is extremely high, and therefore, it is difficult to be used widely.
Therefore, these current threshold devices need longer nonlinear optical fiber or need expensive PPLN semiconductor device
Part.Therefore, it is necessary to provide, a kind of structure is simple, stability is good and lower-cost full photo threshold device.
Summary of the invention
To solve the above problems, the present invention provides a kind of full photo threshold devices based on two-dimensional material wavelength convert function
The structure of part, the full photo threshold device based on two-dimensional material wavelength convert function is simple, and stability is preferable, and cost is relatively low.
The present invention also provides the preparation method and application of the 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, the light are put
Big device is equipped with first end and second end, and the fiber coupler is equipped with first input end, the second input terminal and output end, described full
Be equipped with third end and the 4th end with absorber, the first end connect with the light pulse signal source, the second end with it is described
First input end connection, the optical signal source to be detected are connect with second input terminal, what the light pulse signal source generated
Light pulse signal enters together with the light signal to be checked that the optical signal source to be detected generates after image intensifer amplification
The fiber coupler is coupled, and the mixed light formed after coupling is exported by the output end, the output end with it is described
The connection of third end, the 4th end are connect with the optical filter, and the saturated absorbing body includes optical waveguide and is coated on
The two-dimensional material of light guide surface, the saturated absorbing body have the function of wavelength convert, for inhibiting in the light pulse signal
Noise.
Wherein, the two-dimensional material includes at least one in graphene, black phosphorus, topological insulator and transient metal sulfide
Kind.
Wherein, the optical waveguide is micro-nano fiber or nano wire.
Wherein, the image intensifer is erbium doped optical fibre light amplifier or semiconductor optical amplifier.
Wherein, the light signal to be checked is continuous wave.
Wherein, the optical filter is bandpass filter or bandstop filter.
Wherein, the light pulse signal is inhaled through the amplified peak power of the image intensifer more than or equal to the saturation
The peak value saturation power of acceptor and the sum of the insertion loss of the fiber coupler.
The full photo threshold device architecture based on two-dimensional material wavelength convert function that first aspect present invention provides is very simple
Single, cost is relatively low.In addition, not needing the PPLN semiconductor device using nonlinear optical fiber or valuableness in the full photo threshold device
Part, so as to avoid using nonlinear optical fiber bring that larger and the defect of stability difference and the defect of higher cost is lost.
The full photo threshold device can be used for improving the signal-to-noise ratio for receiving signal, improve signal quality, be conducive to improve optical communication system
Receive judgement performance.
Second aspect of the present invention provides a kind of preparation of full photo threshold device based on two-dimensional material wavelength convert function
Method, comprising the following steps:
Two-dimensional material is coated on to the surface of optical waveguide, forms saturated absorbing body；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter are provided, it is described
Image intensifer is equipped with first end and second end, and the fiber coupler is equipped with first input end, the second input terminal and output end, institute
Saturated absorbing body is stated equipped with third end and the 4th end, the first end is connect with the light pulse signal source, the second end and
First input end connection, the optical signal source to be detected are connect with second input terminal, the output end and described the
The connection of three ends, the 4th end are connect with the optical filter, form the full light threshold based on two-dimensional material wavelength convert function
It is worth device.
Wherein, the two-dimensional material is coated on by the optical waveguide using the method for optical fiber optical tweezers or the method for tear tape
Surface.
The preparation method for the full photo threshold device based on two-dimensional material wavelength convert function that second aspect of the present invention provides
Simply, easy to operate.
Third aspect present invention provides a kind of application of full photo threshold device based on two-dimensional material wavelength convert function,
Full photo threshold device described in the first aspect based on two-dimensional material wavelength convert function is used for all-optical signal processing process
The method of noise in middle reduction light pulse signal, comprising the following steps:
(1) the saturated absorption curve for drawing saturated absorbing body obtains described according to the saturated absorption curve
The average threshold power and average saturation power of saturated absorbing body；
(2) the average threshold power of the saturated absorbing body and the average saturation power are converted into peak threshold power
With peak value saturation power；
(3) power amplification is carried out to the light pulse signal received using image intensifer, obtains amplified light pulse letter
Number, the peak power of the amplified light pulse signal is greater than or equal to the peak value saturation power and optical fiber coupling of saturated absorbing body
The sum of insertion loss of clutch；
(4) light signal to be checked and the amplified light pulse signal are input to after being coupled in fiber coupler
It is input in saturated absorbing body again, it is full more than or equal to the peak value of the saturated absorbing body in the amplified light pulse signal
It is modulated to described to light signal with the signal of power, signal is made to be located at the light carrier at the light pulse signal from wavelength
It is transformed on the light carrier that wavelength is located at the light signal to be checked；Less than peak threshold power in the light pulse signal
Ground noise signal is absorbed strongly by the saturated absorbing body, cannot treat light signal and be modulated, and inhales by the saturation
Mixed light after acceptor includes simultaneously light pulse signal and the light signal to be checked modulated；The mixed light is inputted
Wavelength selection, the wavelength component for the light signal to be checked that the optical filter allows to have been modulated are carried out into optical filter
Pass through, and the wavelength component of light pulse signal is filtered out；Finally it is suppressed the ground noise signal in the light pulse signal.
The application for the full photo threshold device based on two-dimensional material wavelength convert function that third aspect present invention provides, it is described
Full photo threshold device based on two-dimensional material wavelength convert function can be used for all-optical signal processing, to reduce in light pulse signal
Noise.
To sum up, beneficial effect of the present invention includes the following aspects:
1, the full photo threshold device provided by the invention based on two-dimensional material wavelength convert function, structure is very simple, surely
Qualitative preferable, cost is relatively low.The full photo threshold device improves the signal-to-noise ratio for receiving signal, improves signal quality, is conducive to
It improves optical communication system and receives judgement performance；
2, the preparation method of the full photo threshold device provided by the invention based on two-dimensional material wavelength convert function is simple, easy
Operation；
3, the full photo threshold device provided by the invention based on two-dimensional material wavelength convert function can be used for All-optical signal
Processing, to reduce the noise in light pulse signal.
Detailed description of the invention
Fig. 1 is the full photo threshold device architecture based on two-dimensional material wavelength convert function that an embodiment of the present invention provides
Schematic diagram；
Fig. 2 is the microstructure schematic diagram for the saturated absorbing body that an embodiment of the present invention provides；
Fig. 3 is the structure chart for the saturated absorbing body that an embodiment of the present invention provides；
Fig. 4 is the saturated absorption curve test schematic diagram for the saturated absorbing body that an embodiment of the present invention provides；
Fig. 5 is the saturated absorption curve graph for the saturated absorbing body that an embodiment of the present invention provides；
Fig. 6 is the full photo threshold device based on two-dimensional material wavelength convert function for reducing during all-optical signal processing
The effect diagram of noise in light pulse signal.
Specific embodiment
The following is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, 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
Equipped with first end and second end, fiber coupler is equipped with first input end, the second input terminal and output end, saturated absorbing body and is equipped with
Third end and the 4th end, first end are connect with light pulse signal source, and second end is connect with first input end, optical signal source to be detected
Connect with the second input terminal, light pulse signal source generate light pulse signal after image intensifer amplifies with optical signal source to be detected
The light signal to be checked generated enters fiber coupler together and is coupled, and the mixed light formed after coupling is defeated by output end
Out, output end is connect with third end, and the 4th end is connect with optical filter, and saturated absorbing body includes optical waveguide and is coated on light
The two-dimensional material of waveguide surface, saturated absorbing body have the function of wavelength convert, for inhibiting 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
At least one of.
In a preferred embodiment of the invention, topological insulator includes Bi2Te3、Bi2Se3And Sb2Te3At least one of.
In a preferred embodiment of the invention, transient metal sulfide includes at least one in molybdenum disulfide and tungsten disulfide
Kind.
In a preferred embodiment of the invention, the size of two-dimensional material is industry conventional selection, and it is special not do herein
It limits.
In an embodiment of the present invention, light pulse signal source is for generating 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 is greater than or equal to saturation through the amplified peak power of image intensifer
The peak value saturation power of absorber.
In a preferred embodiment of the invention, light pulse signal is greater than or equal to through the amplified peak power of image intensifer
The sum of peak value saturation power and the insertion loss of fiber coupler of saturated absorbing body.Also needed since light pulse signal is subsequent by
Fiber coupler, it is contemplated that fiber coupler can have certain insertion loss, and therefore, light pulse signal amplifies through image intensifer
Peak power afterwards is greater than or equal to the sum of peak value saturation power and insertion loss of fiber coupler of saturated absorbing body.
In an embodiment of the present invention, light pulse signal source is connect with image intensifer by optical fiber.
In a preferred embodiment of the invention, optical fiber is single mode optical fiber.
Full photo threshold device of the invention the basic principle is that using two-dimensional material wavelength convert function, and wavelength convert
The realization of function depends on the unique saturated absorption of two-dimensional material, finally realizes the full light shaping effect of signal, therefore needs
Parameter, which is rationally arranged, makes incident light pulse signal (also referred to as switch light) work in saturated absorption region.The present invention makes
Light pulse signal is rationally amplified with image intensifer, so that amplified optical signal power level 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
It is transparent to pass through, and the ground noise of low-power is in threshold power point hereinafter, being strongly inhibited.
Light pulse signal is amplified into fiber coupler through image intensifer.
In an embodiment of the present invention, image intensifer is connect with fiber coupler by optical fiber.
In a preferred embodiment of the invention, optical fiber is single mode optical fiber.
In an embodiment of the present invention, the light signal to be checked that optical signal source to be detected generates is continuous wave.
The light signal to be checked and amplified light pulse signal that optical signal source to be detected generates by fiber coupler into
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 output end, into saturated absorbing body.
In an embodiment of the present invention, fiber coupler is connect with saturated absorbing body by optical fiber.
In a preferred embodiment of the invention, optical fiber is single mode optical fiber.
Light pulse signal of the light signal to be checked after passing through amplification has wrapped up two by entering together with fiber coupler
The optical waveguide of material is tieed up, the signal of the peak value saturation power of saturated absorbing body is greater than or equal in the light pulse signal after amplifying
(i.e. switch light) treats the absorption of detection optical signal by two-dimensional material saturated absorbing body is saturated, and obtains light signal to be checked to this
Transparent (modulated) of the structure in light pulse signal time domain.Light to be detected i.e. in the switch optical time domain can pass through saturation
Signal entrained by absorber and switch light is transferred to light to be detected from switch light.The beneficial effect is referred to as wavelength convert
Function, i.e. signal are from the light carrier that the light carrier that wavelength is located at intense pulsed light is transformed into that wavelength is located at light to be detected.Only
There is the light pulse signal of high-peak power that can just treat detection optical signal to be modulated, and the ground noise of low-power cannot be right
It is modulated to light signal.Mixed light after two-dimensional material saturated absorbing body include simultaneously light pulse signal and by
The light signal to be checked modulated.Optical signal can pass through optical filter and reach photodetector judgement recovery, and right
In side low-power ground noise due to not being able to achieve wavelength convert, cannot be through optical filter to significantly being pressed down
System, reduces interference of the ground noise for useful signal, plays improvement signal quality, and the noise for improving reception optical signal is compared to
With finally improving the bit error rate performance of reception system.
In an embodiment of the present invention, optical waveguide is micro-nano fiber or nano wire.
In a preferred embodiment of the invention, the diameter of micro-nano fiber is industry conventional selection, does not do particular determination herein.
In a preferred embodiment of the invention, nano wire includes semiconductor nanowires.
In a preferred embodiment of the invention, the diameter of nano wire is industry conventional selection, does not do particular determination herein.
In a preferred embodiment of the invention, when optical waveguide is nano wire, optical fiber and nano wire are by way of coupling
Connection, specific coupled modes are industry conventional selection.
Two-dimensional material is coated in optical waveguide and forms saturated absorbing body by the present invention, which can be with optical fiber telecommunications system
Compatible, so that the full photo threshold device can be compatible with optical fiber telecommunications system, the full photo threshold device architecture is simple, stablizes
Property is strong.
In an embodiment of the present invention, mixed light enters in optical filter from saturated absorbing body.
In an embodiment of the present invention, saturated absorbing body is connected with optical filter by optical fiber.
In a preferred embodiment of the invention, optical fiber is single mode optical fiber.
The optical filter allows the wavelength component to light signal to pass through, and the wavelength component for switching light is filtered out, because
This by the mixed light after two-dimensional material saturated absorbing body after through optical filter, finally obtain through ovennodulation to
Light signal.Its effect is to realize wavelength convert function, i.e., signal entrained by switch light is shifted from switch light wave long component
To light wave long component to be measured.
In an embodiment of the present invention, optical filter is bandpass filter or bandstop filter.
Wavelength convert function possessed by two-dimensional material saturated absorbing body is used for full photo threshold by the present invention, exactly plays wave
" low-resistance high pass " effect of long conversion function, through the light pulse signal that receives optical communication system after rationally amplifying
(as switch light) is coupled with another light beam (as light to be detected), and the mixed light after coupling is sent into two-dimensional material cladding
Optical waveguide on (such as micro-nano fiber, but be not limited to micro-nano fiber), the wavelength based on two-dimensional material saturated absorbing body turns
Function is changed, only compares Qiang Shicai in switch light pulse power and is generated, i.e., signal could be detected in new wavelength component
It measures, and when optical power ratio is weaker, is difficult to generate, i.e., signal cannot be transformed into new wavelength component.Later using a light
Filter is learned, which can allow the wavelength components of light to be detected to pass through, and the wavelength components for switching light are filtered out, through filtering
Optical signal after wave is exactly the optical signal that have passed through after wavelength convert function.Due to receiving the low power noise substrate of signal
It is unsatisfactory for the condition of wavelength convert and is greatly inhibited, and have the signal of high-peak power itself then due to having reached wave
The condition of long conversion function can be detected, and eventually entered into detector judgement and restored, therefore the quality of signal is improved, letter
It makes an uproar than being promoted, the receptivity of optical communication system is improved.This is All-optical signal shaping operation in a way, meets work
For the exemplary functions feature of a threshold device, i.e., big signal is detected, and small signal is suppressed.Further, since using with optical fiber
The compatible transmission waveguide of communication system (such as micro-nano fiber, but it is not limited to micro-nano fiber), entire threshold device structure is simple,
Stability is good.
In an embodiment of the present invention, which can connect with photoreceiver.
Fig. 1 is the full photo threshold device architecture based on two-dimensional material wavelength convert function that an embodiment of the present invention provides
Schematic diagram；Such as Fig. 1,2,4,6,8 and 10 represent communication single mode optical fiber in Fig. 1；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 indicate 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 amplify, and process is amplified
Optical signal enters fiber coupler by optical fiber 6 by the light signal to be checked that optical fiber 4 and optical signal source to be detected generate together
7, by the coupling of fiber coupler 7, light signal and light pulse signal to be checked form mixed light, and mixed light passes through optical fiber
8 enter saturated absorbing body 9, due to the strong evanescent wave effect and power of micro-nano fiber or nanowire surface in saturated absorbing body
Density enhances so that with the two-dimensional material for being coated on light guide surface strong nonlinear interaction occurs for light, produces saturated absorption
Effect, the signal that the peak value saturation power of saturated absorbing body is greater than or equal in amplified light pulse signal will be saturated two-dimentional material
Material saturated absorbing body treats the absorption of light signal, makes to obtain to light signal saturating in light pulse signal time domain to the structure
Bright (being modulated).And the ground noise of low-power cannot treat light signal and be modulated.By two-dimensional material saturated absorption
Mixed light after body include simultaneously light pulse signal and modulated to 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 restrains ground noise；The finally light arteries and veins Jing Guo full photo threshold shaping
It rushes signal and optical filter 11 is entered by optical fiber 10, which allows the wavelength component to light signal to pass through, and
The wavelength component of switch light is filtered out, therefore is passing through optical filter by the mixed light after two-dimensional material saturated absorbing body
Later, finally obtain through ovennodulation to light signal.Its effect is to realize wavelength convert function, i.e., entrained by switch light
Signal is transferred to light wave long component to be measured from switch light wave long component.Due to only having the light pulse signal of high-peak power real
Existing wavelength convert, and the noise floor of low-power can not generation wavelength conversion, therefore by detecting new wavelength component
It realizes the full photo threshold shaping operation for inhibiting noise, can obviously restrain ground noise；Finally by full photo threshold shaping
Light pulse signal enters the photodetector of receiver, is converted into electric signal and carries out reception judgement.
Fig. 2 is the microstructure schematic diagram for the saturated absorbing body that an embodiment of the present invention provides；Fig. 3 is that the present invention one is real
The structure chart for the saturated absorbing body that the mode of applying provides；In Fig. 2 and Fig. 3,91 represent optical waveguide, and 92 representatives are coated on light guide surface
Two-dimensional material.As can be seen that saturated absorbing body provided by the invention includes optical waveguide and is coated on light wave from Fig. 2 and Fig. 3
Lead the two-dimensional material on surface.The two-dimensional material that the present invention will be provided with wavelength convert function is wrapped in optical waveguide, passes through optical waveguide
The strong evanescent wave effect and power density on surface enhance so that light occurs strongly with the two-dimensional material for being coated on light guide surface
Nonlinear interaction.The nonlinear interaction shows themselves in that smooth ground noise signal lower to the power of input absorbs strongly, passes through
Rate is lower, and transmission nearly transparent for the optical signal of the high-peak power of input.
The present invention realizes full photo threshold effect using the wavelength convert function (i.e. saturated absorption) of two-dimensional material, drop
Improvement signal quality is played the role of in low interference of the ground noise for useful signal, improves the signal-to-noise ratio for receiving optical signal, most
The bit error rate performance of reception system is improved eventually.Full photo threshold device proposed by the invention has structure simple, and stability is good
Advantage.
The full photo threshold device based on two-dimensional material wavelength convert function that first aspect present invention provides, the full photo threshold
Device architecture is very simple, and cost is relatively low.In addition, not needed in full photo threshold device using nonlinear optical fiber or valuableness
PPLN semiconductor devices, so as to avoid using nonlinear optical fiber bring that larger and defect and cost of stability difference is lost
Higher defect.The full photo threshold device can be used for improving the signal-to-noise ratio for receiving signal, improves signal quality, is conducive to improve
Optical communication system receives judgement performance.
Second aspect of the present invention provides a kind of preparation of full photo threshold device based on two-dimensional material wavelength convert function
Method, comprising the following steps:
Two-dimensional material is coated on light guide surface, forms saturated absorbing body；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is provided to put
Big device is equipped with first end and second end, and fiber coupler is equipped with first input end, the second input terminal and output end, saturated absorbing body
Equipped with third end and the 4th end, first end is connect with light pulse signal source, and second end is connect with first input end, light letter to be detected
Number source is connect with the second input terminal, and output end is connect with third end, and the 4th end is connect with optical filter, is formed based on two-dimentional material
Expect the full photo threshold device of wavelength convert function.
In an embodiment of the present invention, the method that two-dimensional material is coated on light guide surface is specifically unlimited, such as can adopt
Two-dimensional material is coated on light guide surface with the method for optical fiber optical tweezers or tear tape, these methods are the conventional selection of industry.
The preparation method for the full photo threshold device based on two-dimensional material wavelength convert function that second aspect of the present invention provides
Simply, easy to operate.
Third aspect present invention provides a kind of application of full photo threshold device based on two-dimensional material wavelength convert function,
The present invention is based on the full photo threshold devices of two-dimensional material wavelength convert function to be used for all-optical signal processing.
In an embodiment of the present invention, full photo threshold device will be for that will carry out shaping wait enter the optical signal of photoreceiver.
In a preferred embodiment of the invention, all-optical signal processing is located at before the photodetector of photoreceiver.
The full photo threshold device of the present invention reduces interference of the ground noise for useful signal, plays improvement signal quality,
The signal-to-noise ratio effect for receiving optical signal is improved, the photoelectricity that finally light pulse signal Jing Guo full photo threshold shaping enters receiver is visited
Device is surveyed, electric signal is converted into and carries out reception judgement, improve the bit error rate performance of receiver.
Full photo threshold device provided by the invention, cardinal principle are realized using the wavelength convert function of two-dimensional material
The full light shaping of signal acts on, it is therefore desirable to which rationally setting parameter makes incident light pulse work in saturated absorption region.
In an embodiment of the present invention, the full photo threshold device based on two-dimensional material wavelength convert function is used for All-optical signal
The method of noise in light pulse signal is reduced in treatment process, comprising the following steps:
(1) the saturated absorption curve for drawing saturated absorbing body, obtains saturated absorption according to saturated absorption curve
The average threshold power and average saturation power of body；
(2) the average threshold power of saturated absorbing body is converted into peak threshold power with average saturation power and peak value is satisfied
And power；
(3) power amplification is carried out to the light pulse signal received using image intensifer, obtains amplified light pulse letter
Number, the peak power of amplified light pulse signal is greater than or equal to the peak value saturation power and fiber coupler of saturated absorbing body
The sum of insertion loss；
(4) light signal to be checked and amplified light pulse signal are input to defeated again after being coupled in fiber coupler
Enter into saturated absorbing body, more than or equal to the signal of the peak value saturation power of saturated absorbing body in amplified light pulse signal
It treats detection optical signal to be modulated, the light carrier for being located at signal from wavelength at light pulse signal is transformed into wavelength positioned to be checked
On light carrier at light signal, less than the ground noise signal of peak threshold power, to be saturated absorber strong in light pulse signal
Strong absorption cannot treat detection optical signal and be modulated, and the mixed light after saturated absorbing body includes simultaneously light pulse
Signal and the light signal to be checked modulated；Mixed light is input in optical filter and carries out wavelength selection, optically filtering
Device allows the wavelength component for the light signal to be checked modulated to pass through, and the wavelength component of light pulse signal is filtered out；Finally
It is suppressed the ground noise signal in light pulse signal.
In a preferred embodiment of the invention, in step (1), the saturated absorption effect of saturated absorbing body is measured by testing
Curve is answered, provides foundation for the power working region of optical signal.Saturated absorption curve experiments test process is such as in step (1)
Shown in Fig. 4.Fig. 4 is the saturated absorption curve experiments test signal for the saturated absorbing body that an embodiment of the present invention provides
Figure.In figure, 13,15,17,19,20 and 23 represent communication single mode optical fiber.
As shown in figure 4, its test process are as follows: the light pulse signal that pulse laser 12 issues passes through high power EDFA 14
Variable optical attenuator 16 is sent into after amplification, the decaying size by adjusting tunable attenuator 16 is coated with to adjust to input to
The optical power size of the saturated absorbing body SA of two-dimensional material, to test out saturated absorption curve, light pulse signal passes through
Also need the photo-coupler 18 by 1 × 2 after variable optical attenuator 16, before inputing to saturated absorbing body, therein one
A port, which is exported, is used as monitoring input optical power size to light power meter 22, another port inputs to saturated absorbing body 21,
A light power meter 24 is reconnected for monitoring Output optical power size in the output end of saturated absorbing body 21.According to output light function
Rate size draws saturated absorption curve, and saturated absorption curve synoptic diagram is as shown in Figure 5.Fig. 5 is that the present invention one is implemented
The saturated absorption curve graph that mode provides.By saturated absorption curve it can be concluded that threshold point Pa,thWith saturation point Pa,sa。
In a preferred embodiment of the invention, in step (2), saturated absorption curve is tested out, has been needed light arteries and veins
The average light power for rushing signal is converted into peak optical powers, process are as follows: if the pulsewidth of pulse laser is W, pulse laser
The period of device is T, average light power Pa, then peak optical powers PpAre as follows:
Pp=Pa×T/W (1)
By formula (1) it can be concluded that the corresponding peak threshold power P of saturated absorption curvep,thWith peak value saturation power Pp,sa:
Pp,th=Pa,th×T/W (2)
Pp,sa=Pa,sa×T/W (3)
In a preferred embodiment of the invention, in step (3), saturated absorption curve and corresponding peak value have been obtained
Power needs pointedly to carry out power amplification, process to the light pulse signal that system receives with image intensifer are as follows: if
The optical signal pulsewidth that system receives is Ws, signal period Ts, to make peak power reach the peak of saturated absorption curve
It is worth saturation power Pp,sa, need to amplify light pulse signal with image intensifer EDFA, amplified average light power Pa,EDFA
It should meet:
Pa,EDFA≥Pp,sa×Ws/Ts (4)
Due to consideration that having used fiber coupler in structure configuration, fiber coupler can have certain insertion loss,
Assuming that the loss is L, light pulse signal is amplified with image intensifer EDFA, then final required amplified average light
Power Pa,EDFAIt should meet:
Pa,EDFA≥Pp,sa×Ws/Ts+L (5)
Formula (5) is the necessary condition that can reach full photo threshold effect, and only the output power of image intensifer meets public
Formula (5) could make absorption of intense pulsed light (i.e. switch light) the saturation two-dimensional material to another light beam (light i.e. to be detected), make to
Detection light obtains transparent (being modulated) to the structure in switch optical time domain, which passes through an optical filter again
Switch light ingredient is filtered out, that is modulated passes through to light signal is nearly transparent, is suppressed ground noise signal, final to realize
Wavelength convert function plays ability of the wavelength convert as full photo threshold shaping.
The full photo threshold device based on two-dimensional material wavelength convert function that third aspect present invention provides can be used for entirely
Optical signal prosessing improves the signal-to-noise ratio for receiving signal, improves signal quality, favorably to reduce the noise in optical signal
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 are equipped with first end
And second end, fiber coupler are equipped with first input end, the second input terminal and output end, saturated absorbing body is equipped with third end and the
Four ends, first end are connect with light pulse signal source, and second end is connect with first input end, optical signal source to be detected and the second input
End connection, the light pulse signal that light pulse signal source generates generate after image intensifer amplifies with optical signal source to be detected to be checked
Light signal enters fiber coupler together and is coupled, the mixed light formed after coupling by output end export, output end with
The connection of third end, the 4th end connect 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 have the function of wavelength convert, for inhibiting 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 equipped with first end and
Second end, fiber coupler are equipped with first input end, the second input terminal and output end, and saturated absorbing body is equipped with third end and the 4th
End, first end are connect with light pulse signal source, and second end is connect with first input end, optical signal source to be detected and the second input terminal
Connection, the light pulse signal that light pulse signal source generates generate after image intensifer amplifies with optical signal source to be detected to be detected
Optical signal enters fiber coupler together and is coupled, and the mixed light formed after coupling is exported by output end, output end and the
The connection of three ends, the 4th end connect 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 the function of wavelength convert, for inhibiting the noise 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 are equipped with first end
And second end, fiber coupler are equipped with first input end, the second input terminal and output end, saturated absorbing body is equipped with third end and the
Four ends, first end are connect with light pulse signal source, and second end is connect with first input end, optical signal source to be detected and the second input
End connection, the light pulse signal that light pulse signal source generates generate after image intensifer amplifies with optical signal source to be detected to be checked
Light signal enters fiber coupler together and is coupled, the mixed light formed after coupling by output end export, output end with
The connection of third end, the 4th end connect with optical filter, and saturated absorbing body includes semiconductor nanowires and is coated on semiconductor
The Bi of nanowire surface2Te3, saturated absorbing body has the function of wavelength convert, for inhibiting 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 are equipped with first end
And second end, fiber coupler are equipped with first input end, the second input terminal and output end, saturated absorbing body is equipped with third end and the
Four ends, first end are connect with light pulse signal source, and second end is connect with first input end, optical signal source to be detected and the second input
End connection, the light pulse signal that light pulse signal source generates generate after image intensifer amplifies with optical signal source to be detected to be checked
Light signal enters fiber coupler together and is coupled, the mixed light formed after coupling by output end export, output end with
The connection of third end, the 4th end connect with optical filter, and saturated absorbing body includes semiconductor nanowires and is coated on semiconductor
The molybdenum disulfide of nanowire surface, saturated absorbing body have the function of wavelength convert, for inhibiting the noise in light pulse signal.
Embodiment 5
A kind of preparation method of the full photo threshold device based on two-dimensional material wavelength convert function, comprising the following steps:
The surface that graphene is deposited to, is coated on by the method for optical fiber optical tweezers micro-nano fiber, forms saturated absorbing body；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is provided to put
Big device is equipped with first end and second end, and fiber coupler is equipped with first input end, the second input terminal and output end, saturated absorbing body
Equipped with third end and the 4th end, first end is connect with light pulse signal source by single mode optical fiber, and second end and first input end are logical
Single mode optical fiber connection is crossed, optical signal source to be detected is connect with the second input terminal by single mode optical fiber, and output end passes through with third end
Single mode optical fiber connection, the 4th end are connect with optical filter by single mode optical fiber, are formed and are based on two-dimensional material wavelength convert function
Full photo threshold device.
Embodiment 6
A kind of preparation method of the full photo threshold device based on two-dimensional material wavelength convert function, comprising the following steps:
Graphene coated is formed into saturated absorbing body on the surface of semiconductor nanowires by the method for tear tape method；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, light is provided to put
Big device is equipped with first end and second end, and fiber coupler is equipped with first input end, the second input terminal and output end, saturated absorbing body
Equipped with third end and the 4th end, first end is connect with light pulse signal source by single mode optical fiber, and second end and first input end are logical
Single mode optical fiber connection is crossed, optical signal source to be detected is connect with the second input terminal by single mode optical fiber, and output end passes through with third end
Single mode optical fiber connection, the 4th end are connect with optical filter by single mode optical fiber, wherein semiconductor nanowires and single mode optical fiber are logical
The mode of overcoupling connects, and forms the full photo threshold device based on two-dimensional material wavelength convert function.
Effect example
Full photo threshold device made from embodiment 1 based on two-dimensional material wavelength convert function is used for all-optical signal processing
Noise in light pulse signal is reduced in the process, and Fig. 6 is the full photo threshold device based on two-dimensional material wavelength convert function for complete
The effect diagram of noise in light pulse signal is reduced during optical signal prosessing, 25 represent amplified light pulse signal in figure
In be greater than or equal to saturated absorbing body peak value saturation power signal；26 substrates represented in amplified light pulse signal are made an uproar
Sound；27 represent light signal to be checked (continuous wave), different wavelength components are represented by dashed line, similarly hereinafter；28 represent wavelength convert it
The segment pulse of the light signal to be checked modulated afterwards；29 represent the light signal to be checked modulated after wavelength convert
Ground noise part.From fig. 6 it can be seen that light pulse signal (switch light) is sent after amplification with signal 27 to be detected together
After entering two-dimensional material saturated absorbing body completion wavelength convert function, signal of original load on switch optical wavelength component is turned
It moves on wavelength of optical signal component to be detected, and the peak value saturation power in saturated absorbing body is attached in original light pulse signal
Close pulse signal 25 is almost located at the pulse signal 28 at wavelength of optical signal component to be detected at wavelength by slavish copying, and locates
Ground noise 26 near the peak threshold power of saturated absorbing body is greatly inhibited, and is become wavelength and is located at light to be measured letter
Ground noise 29 at number wavelength component.Therefore, the full photo threshold provided by the invention based on two-dimensional material wavelength convert function
Device can reduce noise in light pulse signal, improve the quality of signal.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot 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, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of full photo threshold device based on two-dimensional material wavelength convert function, which is characterized in that including light pulse signal source,
Image intensifer, optical signal source to be detected, fiber coupler, saturated absorbing body and optical filter, the image intensifer are equipped with the
One end and second end, the fiber coupler are equipped with first input end, the second input terminal and output end, and the saturated absorbing body is set
There are third end and the 4th end, the first end is connect with the light pulse signal source, the second end and the first input end
Connection, the optical signal source to be detected are connect with second input terminal, the light pulse signal that the light pulse signal source generates
Enter the optical fiber coupling together with the light signal to be checked that the optical signal source to be detected generates after image intensifer amplification
Clutch is coupled, and the mixed light formed after coupling is exported by the output end, and the output end is connect with the third end,
4th end is connect with the optical filter, and the saturated absorbing body includes optical waveguide and is coated on light guide surface
Two-dimensional material, the saturated absorbing body have the function of wavelength convert, for inhibiting the noise in the light pulse signal, the light
Pulse signal is greater than or equal to the peak value saturation power of the saturated absorbing body through the amplified peak power of the image intensifer
The sum of with the insertion loss of the fiber coupler.
2. as described in claim 1 based on the full photo threshold device of two-dimensional material wavelength convert function, which is characterized in that described
Two-dimensional material includes at least one of graphene, black phosphorus, topological insulator and transient metal sulfide.
3. as described in claim 1 based on the full photo threshold device of two-dimensional material wavelength convert function, which is characterized in that described
Optical waveguide is micro-nano fiber or nano wire.
4. as described in claim 1 based on the full photo threshold device of two-dimensional material wavelength convert function, which is characterized in that described
Image intensifer is erbium doped optical fibre light amplifier or semiconductor optical amplifier.
5. as described in claim 1 based on the full photo threshold device of two-dimensional material wavelength convert function, which is characterized in that described
Light signal to be checked is continuous wave.
6. as described in claim 1 based on the full photo threshold device of two-dimensional material wavelength convert function, which is characterized in that described
Optical filter is bandpass filter or bandstop filter.
7. a kind of preparation method of the full photo threshold device based on two-dimensional material wavelength convert function, which is characterized in that including with
Lower step:
Two-dimensional material is coated on to the surface of optical waveguide, forms saturated absorbing body；
Light pulse signal source, image intensifer, optical signal source to be detected, fiber coupler and optical filter, the light is provided to put
Big device is equipped with first end and second end, and the fiber coupler is equipped with first input end, the second input terminal and output end, described full
Be equipped with third end and the 4th end with absorber, the first end connect with the light pulse signal source, the second end with it is described
First input end connection, the optical signal source to be detected are connect with second input terminal, the output end and the third end
Connection, the 4th end are connect with the optical filter, form the full photo threshold device based on two-dimensional material wavelength convert function
Part, the light pulse signal are greater than or equal to the peak value of the saturated absorbing body through the amplified peak power of the image intensifer
The sum of the insertion loss of saturation power and the fiber coupler.
8. the preparation method of the full photo threshold device based on two-dimensional material wavelength convert function as claimed in claim 7, special
Sign is, the two-dimensional material is coated on to the table of the optical waveguide using the method for optical fiber optical tweezers or the method for tear tape
Face.
9. the full photo threshold device as claimed in any one of claims 1 to 6 based on two-dimensional material wavelength convert function is used for full light
The method of noise in light pulse signal is reduced in signal processing, comprising the following steps:
(1) the saturated absorption curve for drawing saturated absorbing body, obtains the saturation according to the saturated absorption curve
The average threshold power and average saturation power of absorber；
(2) the average threshold power of the saturated absorbing body and the average saturation power are converted into peak threshold power and peak
It is worth saturation power；
(3) power amplification is carried out to the light pulse signal received using image intensifer, obtains amplified light pulse signal, institute
The peak power for stating amplified light pulse signal is greater than or equal to the peak value saturation power and fiber coupler of saturated absorbing body
The sum of insertion loss；
(4) light signal to be checked and the amplified light pulse signal are input to defeated again after being coupled in fiber coupler
Enter into saturated absorbing body, is saturated function more than or equal to the peak value of the saturated absorbing body in the amplified light pulse signal
The signal of rate is modulated the light signal to be checked, and the light carrier for being located at signal from wavelength at the light pulse signal turns
It changes on the light carrier that wavelength is located at the light signal to be checked；It is less than the base of peak threshold power in the light pulse signal
Back noise signal is absorbed strongly by the saturated absorbing body, cannot treat detection optical signal and be modulated, inhale by the saturation
Mixed light after acceptor includes simultaneously light pulse signal and the light signal to be checked modulated；The mixed light is inputted
Wavelength selection, the wavelength component for the light signal to be checked that the optical filter allows to have been modulated are carried out into optical filter
Pass through, and the wavelength component of light pulse signal is filtered out；Finally it is suppressed the ground noise signal in the light pulse signal.
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