CN105404072B - A kind of method and device for inputting colourless wide spectrum All Optical Wavelength Conversion - Google Patents
A kind of method and device for inputting colourless wide spectrum All Optical Wavelength Conversion Download PDFInfo
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- CN105404072B CN105404072B CN201510967419.9A CN201510967419A CN105404072B CN 105404072 B CN105404072 B CN 105404072B CN 201510967419 A CN201510967419 A CN 201510967419A CN 105404072 B CN105404072 B CN 105404072B
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- G—PHYSICS
- G02—OPTICS
- 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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
- G02F1/3538—Four-wave interaction for optical phase conjugation
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3544—Particular phase matching techniques
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/35—Non-linear optics
- G02F1/365—Non-linear optics in an optical waveguide structure
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
- G02F2/006—All-optical wavelength conversion
Abstract
A kind of method and device for inputting colourless wide spectrum All Optical Wavelength Conversion, the signal light wavelength that this method is sent to signal source is detected in real time, when changing, the ideler frequency optical wavelength changed as needed, calculate pump wavelength, and its wavelength is adjusted by pumping source, then flashlight and pump light are passed sequentially through into coupler, amplifier, Polarization Controller and conversion waveguide, conversion waveguide has flat and low dispersion, when pump wavelength changes with flashlight, phase-matching condition can be met, generation four-wave mixing effect, realize wavelength convert, so that ideler frequency optical wavelength keeps constant.Device includes the feedback loop being made up of pumping source, signal source, wavemeter and arithmetic unit, has the conversion waveguide of flat and low dispersion, coupler, amplifier, and Polarization Controller.The present invention can realize colourless, wide spectrum the All Optical Wavelength Conversion of input, to pumping insensitivity, increase considerably the application of this AOWC, reduce cost.
Description
Technical field
The invention belongs to all-optical signal processing field, is related to a kind of method and apparatus of All Optical Wavelength Conversion, more particularly to
A kind of colourless, wide spectrum All Optical Wavelength Conversion method and device of input based on flat low dispersion waveguide.Wide spectrum is typically
Refer to 3dB switching bandwiths.
Background technology
With a large amount of popularizations of the high speed development and mobile terminal of current mankind mobile Internet, network is proposed at a high speed
The communicating requirement of rate, Large Copacity, 3 surpass (ultrahigh speed, vast capacity, overlength distance) all-optical communication network and be increasingly taken seriously.
But all-optical signal processing has very big key effect in high-speed high capacity optic communication, such as the amplification, regeneration, light of optical signal
Shaping pulse, photoswitch, wavelength convert etc..Particularly wavelength conversion technology, the reuse rate of wavelength can be improved, reduce the whole network
Required wavelength number, avoid wavelength collision and caused obstruction.On the other hand, with the development of SOI technology, wavelength convert
Device tends to be integrated and complete photochemical, therefore the AOWC based on waveguide device has obtained extensive research.
Existing integrated-type AOWC, the Cross-phase Modulation being mainly based upon in waveguide material, intersect increasing
The nonlinear effects such as beneficial modulation, four-wave mixing are realized.Realized at present using four-wave mixing effect in wavelength convert function,
Two major class technologies can be divided into：Based on phase-matching technique [Q.Liu, S.Gao, L.Cao, and S.He, " Design of
low-dispersion-discrepancy silicon waveguide for broadband polarization-
Independent wavelength conversion " .J.Opt.Soc.Am.B, 29,215-219 (2012)；Chinese patent Shen
Please numbers 201110167147.6] and quasi-phase matching [X.Zhang, J.Yuan, J.Zou, B.Jin, X.Sang, Q.Wu,
C.Yu, and G.Farrell, " Enhanced broadband parametric wavelength conversion in
Silicon waveguide with the multi-period grating, " Photon.J.6,6601410 (2014)；In
State's invention number of patent application：201410763322.1].
Existing wavelength shifter major technique shortcoming is very sensitive to pumping wavelength：Realize that wide spectrum is efficient
Wavelength convert, its pumping wavelength must immobilize (close to zero dispersion point), it is impossible to which left and right drift changes.When flashlight is sent out
During changing, the ideler frequency light (target light) of conversion also changes, in order to ensure that the target light of conversion immobilizes, it is necessary to change
Pumping wavelength, but its transfer characteristic necessarily substantially reduces, causes that application is small, cost is high.Provided in consideration of it, how to design
There is the All Optical Wavelength Conversion converter for inputting colourless property and wide spectrum so that unlike signal light can be transformed into fixation as needed
Target light on, and keep high transfer characteristic, the application and versatility of wavelength shifter can be greatly increased, reduce
Cost.
The content of the invention
In order to overcome the target light of existing AOWC to change with flashlight, switching bandwith the deficiencies of, the present invention
Provide a kind of colourless, wide spectrum All Optical Wavelength Conversion method and device of input based on flat and low dispersion waveguide.
The technical solution adopted for the present invention to solve the technical problems is：A kind of method of wide spectrum All Optical Wavelength Conversion,
Characterized in that, the signal light wavelength λ that this method is sent to signal sourcesDetected in real time, signal light wavelength λsChange
When, the ideler frequency light wavelength lambda changed as neededi0, calculate the wavelength X of the now pump light that pumping source is sentp, (λp=2/ (1/ λs+1/
λi0)), and it is 2/ (1/ λ accordingly to adjust its wavelength by pumping sources+1/λi0), flashlight and pump light are then passed sequentially through into coupling
Device, amplifier, Polarization Controller and conversion waveguide, the conversion waveguide has flat and low dispersion, in pump wavelength with letter
Number light λsWhen changing, phase-matching condition is equally disclosure satisfy that, four-wave mixing effect occurs, realizes and inputs colourless, wide light
The All Optical Wavelength Conversion of spectrum, and keep high transfer characteristic so that when flashlight changes, and the ideler frequency light (target changed
Light) wavelength keep it is constant.
A kind of device of wide spectrum All Optical Wavelength Conversion, it includes pumping source, signal source, coupler, amplifier, polarization control
Input end signal of the output end of device processed and conversion waveguide, the pumping source and signal source respectively with the coupler is connected, institute
The output end for stating coupler passes sequentially through amplifier, Polarization Controller and conversion waveguide；Characterized in that, the signal source and pump
Pu is connected with wavemeter and arithmetic unit in turn between source, collectively forms feedback loop, the conversion waveguide is with flat and low color
Scattered waveguide；
During work, the signal light wavelength λ of signal source described in the wavemeter real-time detections, as signal light wavelength λsBecome
Wavemeter is by signal light wavelength λ during changesIt is input in the arithmetic unit, the ideler frequency optical wavelength that the arithmetic unit is changed as needed
λi0, and four-wave mixing principle, the wavelength for obtaining now pumping source should be 2/ (1/ λs+1/λi0), pump is accordingly adjusted by pumping source
(1/ λ of Pu light wave a length of 2/s+1/λi0)；Flashlight and pump light pass sequentially through coupler, amplifier, Polarization Controller and enter institute
Conversion waveguide is stated, the pump wavelength is with flashlight λsWhen changing, phase-matching condition is equally disclosure satisfy that, four ripples occur
Effect is mixed, realizes and inputs colourless, wide spectrum All Optical Wavelength Conversion so that when flashlight changes, and the ideler frequency changed
Optical wavelength keeps constant.
In such scheme, the feedback loop between the pumping source and signal source of design, wavemeter real-time detection signal light wavelength
λs, as signal light wavelength λsWavemeter is by signal light wavelength (λ when changings) and be input in arithmetic unit, the arithmetic unit according to
Need ideler frequency light (target light) wavelength (λ changedi0), and four-wave mixing principle, it can be deduced that now the wavelength of pumping source should
(the λ that is how manyp=2/ (1/ λs+1/λi0)), it is 2/ (1/ λ that its wavelength is accordingly adjusted by pumping sources+1/λi0)。
In such scheme, the conversion waveguide of design has flat and low dispersion characteristics, and specific dispersion curve is wider
Wave-length coverage in (generally in tens nanometers to thousands of nanometer ranges), its 2nd order chromatic dispersion β2In the anomalous dispersion region, change turns to 0
~-20ps2/ km (absolute value is the smaller the better), fourth-order dispersion β4Value changes are -3 × 10-2~10 × 10-2ps4/ km (get over by absolute value
It is small better).So that work as pump wavelength (λp) larger drift occurs (with flashlight λsChange) when, it can equally meet phase
Position matching condition, occurs four-wave mixing effect, and keeps high transfer characteristic, realizes and inputs colourless, wide spectrum full light wave
Long conversion so that the ideler frequency light to be changed (target light) wavelength (λi0) keep constant.
In such scheme, the waveguide with flat and low dispersion of design, various waveguiding structures can be used to carry out dispersion
Optimization obtains, such as slit slot waveguides, photonic crystal waveguide, periodic waveguide structure.
In such scheme, there is flat and low dispersion curve：In wide spectral region, dispersion values (2nd order chromatic dispersion β2, four
Rank dispersion values β4It is all smaller close to null value, phase-matching condition can be met：Phase mismatch Δ k=2 γ Pp+β2Ω2+1/
12*β4Ω4, Ω=ω in formulap-ωsIt is flashlight angular frequencys(ωs=2 π c/ λs) and pump light angular frequencyp(ωp=2 π
c/λp) between frequency displacement, β2, β4Second order and fourth-order dispersion value respectively at pumping source, PpFor the power of pumping source, γ is conversion
The nonlinear factor of waveguide.So that the non-constant width of 3dB switching bandwiths of wavelength shifter.
The present invention has the advantage that compared with prior art：
1. the AOWC can realize that input is colourless：When flashlight changes, obtained accordingly by feedback loop
Required pumping wavelength, ensure that the target light of conversion is invariable.Different flashlights is transformed into as needed solid
In fixed target light, and keep high transfer characteristic.When avoiding the flashlight from drifting about, target light also and then changes.Can be significantly
Increase the application and versatility of wavelength shifter, reduce cost.
2. the AOWC is to pumping insensitivity, when large change (hundreds of nanometers of skew) occurs for pumping wavelength
When, phase-matching condition can be met, realize wavelength convert.The versatility of AOWC is realized, as long as pumping
Wavelength is in the flat low dispersion section of conversion waveguide, and four-wave mixing can occur, realize wavelength convert.
3. the AOWC has used the waveguide of flat low dispersion as conversion waveguide so that 3dB transfer zones
Wide non-constant width, has ultra-wide characteristic.
Brief description of the drawings
Fig. 1 is the structural representation that All Optical Wavelength Conversion is typically realized based on waveguide；
Fig. 2 is the knot that the colourless wide spectrum All Optical Wavelength Conversion of input is realized based on flat low dispersion waveguide of apparatus of the present invention
Structure schematic diagram；
Fig. 3 is the schematic cross-section of flat low dispersion waveguide structure in the embodiment of the present invention；
Fig. 4 is that the flat and low dispersion curve figure of waveguide is changed in the embodiment of the present invention；
Fig. 5 is to input colourless wide spectrum All Optical Wavelength Conversion characteristic one based on flat low dispersion waveguide in the embodiment of the present invention
Figure；
Fig. 6 is to input colourless wide spectrum All Optical Wavelength Conversion characteristic two based on flat low dispersion waveguide in the embodiment of the present invention
Figure.
Embodiment
In order that the objects, technical solutions and advantages of the present invention become apparent from understanding, below in conjunction with drawings and Examples pair
The present invention is described in more detail.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
Shown in reference picture 2, of the present invention realized based on flat low dispersion waveguide inputs colourless wide spectrum all-optical wave-length
The method and apparatus of conversion, core concept are：Based on waveguide all-optical wavelength shifter, pumping source 1 and signal are on the one hand utilized
Source 2 builds feedback loop 10, and when the light that signal source 2 is sent changes, pumping source 1 can be according to the ideler frequency light of required conversion
(target light) changes with the change of signal source 2, to ensure that the ideler frequency light of conversion immobilizes；On the other hand make use of with flat
The waveguide 7 of smooth and low dispersion is as conversion waveguide so that when the optical signal that pumping source 1 is sent changes, still can meet
Phase-matching condition (dispersion values depended primarily at pumping), realize the wavelength convert of high-efficiency wide-spectrum.
Fig. 1 is the structure for typically realizing All Optical Wavelength Conversion based on waveguide based on waveguide, and conversion waveguide 6 is made by design
Dispersion values at pumping close to zero or smaller.The light that pumping source 1 and signal source 2 are sent is passed through together by coupler 3
Cross amplifier 4 to amplify, fit and adjust their polarization state (regulating and controlling by Polarization Controller 5), then by changing waveguide 6, work as satisfaction
During phase matched, four-wave mixing effect occurs wherein, produces ideler frequency light (ωi=2 ωp-ωs), realize the conversion of wavelength.
And in Fig. 1 in typical conventional wavelength-conversion device, for changing waveguide 6, its dispersion values only in certain or
Close to zero or smaller in the narrower wave-length coverage of person, when the optical wavelength of pumping source 1 is near this zero dispersion value, meet phase
Matching condition, it is possible to achieve wavelength convert；If when the flashlight that signal source 2 is sent changes, and the target to be changed
It is particularly distant from zero dispersion point when now the optical wavelength of pumping source 1 must change accordingly when photofixation is constant
When, it cannot now meet phase-matching condition well, the efficiency and bandwidth of wavelength convert can all be affected.This allusion quotation
Different flashlights can not be transformed into same target light by the conventional wavelength-conversion device of type, it is impossible to realized and inputted colourless wavelength
Conversion.And it is very sensitive to pumping wavelength, there is certain selectivity and restricted.
Fig. 2 is the knot that the colourless wide spectrum All Optical Wavelength Conversion of input is realized based on flat low dispersion waveguide of apparatus of the present invention
Structure schematic diagram
A feedback loop 10 has been used in apparatus of the present invention and the waveguide 7 with flat and low dispersion is used as converted wave
Lead.First, the light that pumping source 1 and signal source 2 are sent amplifies by amplifier 4 by coupler 3, passes through Polarization Control together
Device 5 is suitable to adjust its polarization state, then by changing waveguide (waveguide 7 with flat and low dispersion), when meeting phase matched,
Four-wave mixing effect occurs wherein, produces ideler frequency light (ωi=2 ωp-ωs), realize the conversion of wavelength.
Secondly, as the signal light wavelength (λ that signal source 2 is sents, fs=c/ λs) when drift (or change) occurs, by anti-
Wavemeter 8 in feedback ring 10 detects signal light wavelength (λ nows), it is input in arithmetic unit 9, the spare time changed as needed
Frequency light (target light) wavelength (λi0, fi0=c/ λi0), and four-wave mixing principle, it can be deduced that now the optical wavelength of pumping source 1 should
(the f that is how manyp=(fs+fi0)/2, λp=c/fp).So, as signal light wavelength (fs) when how to change, can obtain corresponding
Pumping source 1 optical wavelength (fp) so that ideler frequency light (target light) wavelength (f of conversioni0=c/ λi0) keep constant.
Finally, by the use of the waveguide 7 with flat and low dispersion as conversion waveguide, it can to change waveguide in wide light
All there are the dispersion values (or less dispersion values) close to zero, therewith, when the optical wavelength of pumping source 1 is with signal in spectral limit
When light changes and changed, phase-matching condition is disclosure satisfy that all the time, and realize wavelength convert using four-wave mixing effect.Cause
This can realize the All Optical Wavelength Conversion for inputting colourless wide spectrum.
The described waveguide 7 with flat and low dispersion, can use various waveguiding structures to carry out chromatic dispersion optimized light-guide acquisition, such as
The structures such as slit slot waveguides, photonic crystal waveguide, periodic waveguide.
The present invention can realize the colourless wide spectrum All Optical Wavelength Conversion of input, when the wavelength of pumping source 1 changes with flashlight
When becoming and changing, the wavelength change of high-efficiency wide-spectrum also can be achieved on.Sent in particular for different signal sources 2
Light be transformed into some fixation ideler frequency light on when, can utilize the inventive method and device, it is not necessary to change change waveguide,
And high transfer characteristic is kept, greatly reduces cost and power consumption.
In multi-user's Large Copacity access system, the present invention can be the N (N is natural number) of descending (local side to user terminal)
Individual wavelength (flashlight), (if using traditional wavelength shifter, need N number of difference using N number of identical wavelength shifter
), it is transformed into user terminal on same wavelength (ideler frequency light), cost can be greatly reduced.Lead in addition in multichannel Large Copacity
In letter, it can also realize that different channels are downloaded or uploaded in some identical ideler frequency light using the present invention.
Embodiments of the invention：
Fig. 3 is the schematic cross-section of flat in the embodiment of the present invention and low dispersion the structure of waveguide 7, described flat low color
It is straight wave guide to dissipate waveguide, waveguide length 10mm, employs double aperture slit slot structures.Concrete composition material and size are：Bottom
For 4um silica, width W be 933nm, lower floor arsenones height Hl1For 330nm, underlying silica height Hs1For
114nm, middle level arsenones height Hl2For 960nm, upper strata silica height Hs2For 112nm, upper strata arsenones height Hl3For
328nm。
Fig. 4 is that the flat and low dispersion curve figure of waveguide, described conversion waveguide dispersion values are changed in the embodiment of the present invention：
In 1150nm bandwidth ranges, its 2nd order chromatic dispersion β2Value changes are 0~-13ps2/ km, fourth-order dispersion β4Value changes be -3.68 ×
10-3~3.56 × 10-2ps4/ km, there is not only low and flat characteristic.
Fig. 5 is to realize to input colourless wide spectrum All Optical Wavelength Conversion spy based on flat low dispersion waveguide in the embodiment of the present invention
Property figure.Using the flat low dispersion characteristics of the double aperture slit waveguide in above-mentioned, simulation analysis are drawn：When pumping wavelength becomes from 2300nm
When changing to 2500nm, 3dB switching bandwiths are about 1200nm, are respectively provided with ultra wide band characteristic, as shown in Figure 5.Further, such as Fig. 6
It is shown, also analyze pumping wavelength from 2000nm change to 3000nm when, all there is very wide 3dB switching bandwiths.
Exemplified by according to described by Fig. 5, as flashlight (λs) when being respectively 1959nm, 2109nm, 2267nm, accordingly by
Feedback loop regulation pump light (λp) it is 2300nm, 2400nm, 2500nm, wavelength convert and converting into target light can be realized
(λi0) it is 2837nm.Therefore, in same conversion waveguide, when flashlight shifts, (offset can reach hundreds of and receive
Rice), pump light can be adjusted accordingly, and the final target optical wavelength for realizing conversion keeps constant.It can be tested from this sample result
Demonstrate,prove the method and apparatus of the present invention input is colourless, wide spectrum characteristic, there is the All Optical Wavelength Conversion for inputting colourless wide spectrum
Function, there is significant technique effect.
The present invention is not restricted to be used in specification and embodiment, for those skilled in the art,
Various corresponding changes and modification can be made according to the present invention, and all these corresponding changes and modification belong to the present invention
Scope of the claims.
Claims (10)
- A kind of 1. method of wide spectrum All Optical Wavelength Conversion, it is characterised in that the signal light wavelength λ that this method is sent to signal sources Detected in real time, signal light wavelength λsWhen changing, the ideler frequency light wavelength lambda changed as neededi0, calculate now pumping The wavelength X for the pump light that source is sentp, λp=2/ (1/ λs+1/λi0), and it is 2/ (1/ λ accordingly to adjust its wavelength by pumping sources+1/ λi0), flashlight and pump light are then passed sequentially through into coupler, amplifier, Polarization Controller and conversion waveguide, the converted wave Lead with flat and low dispersion, as flashlight λsChange and pump wavelength when changing therewith, equally disclosure satisfy that phase With condition, four-wave mixing effect occurs, and keeps high transfer characteristic, realizes that inputting colourless, wide spectrum all-optical wave-length turns Change so that the ideler frequency optical wavelength to be changed keeps constant.
- 2. the method for wide spectrum All Optical Wavelength Conversion according to claim 1, it is characterised in that the conversion waveguide meets Following phase-matching conditions：Phase mismatch Δ k=2 γ Pp+β2Ω2+1/12*β4Ω4, Ω=ω in formulap-ωsIt is signal optic angle Frequencies omegasWith pump light angular frequencypBetween frequency displacement, β2, β4Second order and fourth-order dispersion value respectively at pumping source, PpFor pumping The power in source, γ are the nonlinear factors for changing waveguide.
- 3. the method for wide spectrum All Optical Wavelength Conversion according to claim 1 or 2, it is characterised in that the conversion waveguide For slit slot waveguides, photonic crystal waveguide or periodic waveguide.
- 4. the method for wide spectrum All Optical Wavelength Conversion according to claim 1 or 2, it is characterised in that the conversion waveguide 2nd order chromatic dispersion β2In the anomalous dispersion region, and its 2nd order chromatic dispersion β2With fourth-order dispersion β4The absolute value of changing value is as far as possible small.
- 5. the method for wide spectrum All Optical Wavelength Conversion according to claim 4, it is characterised in that the two of the conversion waveguide Rank dispersion β2Change turns to 0~-20ps2/ km, fourth-order dispersion β4Value changes are -3 × 10-2~10 × 10-2ps4/km。
- 6. a kind of device of wide spectrum All Optical Wavelength Conversion, it includes pumping source, signal source, coupler, amplifier, Polarization Control Input end signal of the output end of device and conversion waveguide, the pumping source and signal source respectively with the coupler is connected, described The output end of coupler passes sequentially through amplifier, Polarization Controller and conversion waveguide；Characterized in that, the signal source and pumping It is connected with wavemeter and arithmetic unit between source in turn, collectively forms feedback loop, the conversion waveguide is with flat and low dispersion Waveguide；During work, the signal light wavelength λ of signal source described in the wavemeter real-time detections, as signal light wavelength λsWhen changing Wavemeter is by signal light wavelength λsIt is input in the arithmetic unit, the ideler frequency light wavelength lambda that the arithmetic unit is changed as neededi0, and Four-wave mixing principle, the wavelength for obtaining now pumping source should be 2/ (1/ λs+1/λi0), pumping light wave is accordingly adjusted by pumping source A length of 2/ (1/ λs+1/λi0)；Flashlight and pump light pass sequentially through coupler, amplifier, Polarization Controller and enter the conversion Waveguide, should be in pump wavelength with flashlight λsChange and when changing, equally disclosure satisfy that phase-matching condition, occur Four-wave mixing effect, realize and input colourless, wide spectrum All Optical Wavelength Conversion so that the ideler frequency optical wavelength to be changed is kept not Become.
- 7. the device of wide spectrum All Optical Wavelength Conversion according to claim 6, it is characterised in that the conversion waveguide meets Following phase-matching conditions：Phase mismatch Δ k=2 γ Pp+β2Ω2+1/12*β4Ω4, Ω=ω in formulap-ωsIt is signal optic angle Frequencies omegasWith pump light angular frequencypBetween frequency displacement, β2, β4Second order and fourth-order dispersion value respectively at pumping source, PpFor pumping The power in source, γ are the nonlinear factors for changing waveguide.
- 8. according to the device of the wide spectrum All Optical Wavelength Conversion of claim 6 or 7, it is characterised in that it is described conversion waveguide be Slit slot waveguides, photonic crystal waveguide or periodic waveguide.
- 9. according to the device of the wide spectrum All Optical Wavelength Conversion of claim 6 or 7, it is characterised in that the conversion waveguide 2nd order chromatic dispersion β2In the anomalous dispersion region, and its 2nd order chromatic dispersion β2With fourth-order dispersion β4The absolute value of changing value is as far as possible small.
- 10. the device of wide spectrum All Optical Wavelength Conversion according to claim 9, it is characterised in that the two of the conversion waveguide Rank dispersion β2Change turns to 0~-20ps2/ km, fourth-order dispersion β4Value changes are -3 × 10-2~10 × 10-2ps4/km。
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| CN102347797A (en) * | 2011-11-02 | 2012-02-08 | 华中科技大学 | Multifunctional optical signal processing system |
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| JPH05165075A (en) * | 1991-12-13 | 1993-06-29 | Nippon Telegr & Teleph Corp <Ntt> | Stabilized wave-length converting device |
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