CN202502329U - All-optical logic gate device based on nanowire waveguides of multi-slot silicon substrate - Google Patents
All-optical logic gate device based on nanowire waveguides of multi-slot silicon substrate Download PDFInfo
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- CN202502329U CN202502329U CN201220008207XU CN201220008207U CN202502329U CN 202502329 U CN202502329 U CN 202502329U CN 201220008207X U CN201220008207X U CN 201220008207XU CN 201220008207 U CN201220008207 U CN 201220008207U CN 202502329 U CN202502329 U CN 202502329U
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Abstract
The utility model discloses an all-optical logic gate device based on nanowire waveguides of a multi-slot silicon substrate, which is characterized by comprising two input waveguides, two output waveguides, first mode converters (51), a nonlinear directional coupler (6) and second mode converters (52). The input waveguides include a first input waveguide (1) and a second input waveguide (2) and are used for inputting signal optical pulses and controlling the optical pulses, the output waveguides include a first output waveguide (3) and a second output waveguide (4), the first input waveguide (1) and the second input waveguide (2) are respectively connected with the nonlinear directional coupler (6) by the first mode converters (51), and the nonlinear directional coupler (6) is respectively connected with the first output waveguide (3) and the second output waveguide (4) by the second mode converters (52). The all-optical logic gate device has the advantages of easiness in implementation, fast working speed, low power consumption, compact structure, cheap price and the like.
Description
Technical field
The utility model relates to a kind of integrated-type all-optical logic gate device that is applied in optical communication system, optical computer system and the optical signal processing system, belongs to the integrated optics technique field.
Background technology
All-optical logic gate is the elementary cell during light signal is handled, and is to realize the light packet switch key components of photometry calculation and following high-speed high capacity optical-fiber network.Existing all-optical logic gate mainly is to utilize nonlinear optical fiber, semiconductor optical amplifier, and nonlinear waveguide etc. as core devices to realize the light logic function.The logic gate of utilizing nonlinear optical fiber mainly is to utilize the Kerr effect of optical fiber; Operating rate is faster arranged, and still, the logic gate of this structure needs very big power consumption and very long time delay; Need long optical fiber to guarantee the nonlinear effect that it is stronger simultaneously; Therefore this structural volume is bigger, is unfavorable for integratedly, and system is unstable.Utilize the operating rate of the all-optical logic gate of semiconductor optical amplifier can receive the restriction in free carrier life-span in the semiconductor optical amplifier, be unfavorable for signal Processing at a high speed.
At present; Fast development along with complementary metal oxide semiconductor (CMOS) (CMOS) technology; The all-optical logic gate of based semiconductor micro-nano waveguide becomes a research direction in integrated optics field, mainly contains based on the waveguiding structure of two types of the silicon on III-V compound material and the insulation course (SOI) and realizes all-optical logic gate.With GaAs, InP is the III-V compound material of representative, because the restriction of processing technology utilize the all-optical logic gate that waveguiding structure constituted of this material to be not easy to realize that with other photonic device monolithic is integrated, and cost is higher.Along with the fast development of silicon photonics, the SOI waveguiding structure has obtained very big concern and since use low-cost silicon materials realize various photonic devices and with mature C OMS process compatible, therefore huge development potentiality is arranged at the photoelectron integration field.Based on the all-optical logic gate of SOI waveguiding structure, mainly utilize the effective refractive index of the nonlinear optical effect change waveguide material of silica-base material to come the control transmission flashlight, thereby realize the various logic operation; But; The logic gate operating rate can receive the restriction of Carrier Recombination, is difficult to realize superfast all-optical logic operation, simultaneously; The silica-base material nonlinear effect very a little less than; Required power consumption is bigger during work, therefore, directly utilizes traditional SOI waveguiding structure to realize that the all-optical logic gate design of high-speed low-power-consumption is not-so-practical.
Summary of the invention
Technical matters: in order to overcome the deficiency of existing all-optical logic gate; The utility model provides a kind of all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire, have be easy to realize, advantages such as operating rate is fast, low in energy consumption, compact conformation, relative low price.The mature C MOS processing technology of can on silicon base chip, utilizing the utility model realizes that monolithic is integrated, has great significance for the development of silicon photonics.
Technical scheme: for solving the problems of the technologies described above, the utility model provides a kind of all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire, and this device includes two input waveguides that are used for input signal light pulse and control light pulse; I.e. first input waveguide and second input waveguide, two output waveguides, i.e. first output waveguide and second output waveguide; First mode converter; Nonlinear directional coupler, second mode converter, wherein
First input waveguide is connected with nonlinear directional coupler through first mode converter respectively with second input waveguide, and nonlinear directional coupler is connected with second output waveguide with first output waveguide respectively through second mode converter.
Preferably; Nonlinear directional coupler is made up of the waveguide of three-flute vertical si base nano-wire; Fill si-nanocrystals material in its groove with Kerr nonlinearity effect; First mode converter is used to realize the mode switch between first input waveguide, second input waveguide and the waveguide of three-flute vertical si base nano-wire, and second mode converter is used to realize the mode switch between the base nano-wire waveguide of three-flute vertical si and first output waveguide, second output waveguide.
Preferably, first input waveguide, second input waveguide, first output waveguide and second output waveguide are the silicon ridge waveguide structure on the insulation course, and can carry accurate transverse electric mode and accurate TM mode simultaneously.
Beneficial effect:
1, because core parts are directional coupler, thus principle of work simple, control convenience, compact conformation, be easy to cascade.
2, directional coupler is realized by three-flute vertical si base nano-wire waveguiding structure; This structure can realize the mould field concentrated and is distributed in the groove of low-refraction; The waveguiding structure that its light field limitation capability is more traditional and single groove structure are a lot of greatly; Therefore can better realize non-linear effect, reduce the input optical power requirement.
3, because the special construction of three-flute vertical si base nano-wire waveguide can be filled the si-nanocrystals material with Kerr nonlinearity effect in groove, overcome the more weak shortcoming of traditional silicon based waveguides structural nonlinear effect, further reduced the input optical power requirement.
4, owing to utilize the Kerr nonlinearity effect, the logical operation response time is very short, so the all-optical logic gate operating rate is very fast, can realize light signal processing at a high speed.
5, silica-based nanowire waveguiding structure material is cheap, and compatible with mature C MOS processing technology, makes simply, can realize that silica-based monolithic is integrated, in the integrated optics field great potential is arranged.
Description of drawings
Fig. 1 is (NOT) arrangement plan of logic gate of the utility model " non-";
Fig. 2 is the sectional view of nonlinear directional coupler in the utility model;
Fig. 3 a is the principal component mould field pattern of the accurate transverse electric mode of three-flute vertical si base nano-wire waveguiding structure;
Fig. 3 b is the principal component mould field pattern of the accurate TM mode of three-flute vertical si base nano-wire waveguiding structure;
Fig. 4 be the utility model " with " (AND) with " or " (OR) arrangement plan of logic gate;
Label declaration is following among the figure:
1-first input waveguide, 2-second input waveguide, 3-first output waveguide, 4-second output waveguide,
51-first mode converter, 52-second mode converter, the 6-nonlinear directional coupler,
7-silicon, 8-silicon dioxide, 9-si-nanocrystals, 10-low-refraction packing material (air or silicon dioxide)
Embodiment
Below in conjunction with accompanying drawing the principle and the characteristic of the utility model are described, institute gives an actual example and only is used to explain the utility model, is not the scope that is used to limit the utility model.
The utility model adopts following technical scheme, and a kind of all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire comprises: but include two input signal light pulses and the input waveguide 1,2 of controlling light pulse; Two output waveguides 3,4, mode converter 51; 52, nonlinear directional coupler 6, wherein input waveguide 1; 2 with output waveguide 3; 4 and nonlinear directional coupler 6 between the coupling part be first mode converter 51 and second mode converter 52, realize input waveguide 1,2 and output waveguide 3; 4 and the waveguide of three-flute vertical si base nano-wire between mode switch, nonlinear directional coupler 6 is in groove, to fill nonlinear material by the waveguide of three-flute vertical si base nano-wire to constitute.
The waveguide of three-flute vertical si base nano-wire is made up of four high refractivities distribution difference silica-based nanowires (promptly burying rectangular waveguide) that closely lean on; Middle three grooves (being nanoscale low-refraction distributive province) that form; Boundary relation according to electromagnetic field; Uncontinuity will appear in the electric field component on the material interface that distributes perpendicular to high index-contrast, because the width (nanometer scale) of groove much smaller than the characteristic decay length of rectangular waveguide, makes the electric field in the groove of low-refraction strengthen greatly.Compare with single slot wave guide structure, three-flute vertical si base nano-wire waveguiding structure has stronger light field limitation capability, but the groove number is more, and the light field limitation capability improves not obvious.Saidly for the realization characteristic of all-optical logic gate be: because stronger polarization correlated of slot wave guide structure, accurate transverse electric mode is limited in the nonlinear groove by strictness, and accurate TM mode then is diffused in the silicon nanowires covering; Therefore; Accurate transverse electric mode and the propagation characteristic of accurate TM mode in the non-linear slots waveguide are completely different, and when having only accurate TM mode to incide in the nonlinear directional coupler, its propagation condition is identical with linear case; When accurate transverse electric mode and the incident simultaneously of accurate TM mode; Because accurate transverse electric mode well is limited in the non-linear slots of low-refraction, receive the effect of nonlinear effect, different under the propagation characteristic of accurate transverse electric mode and the linear case; And can cause the phase change of the accurate TM mode signal of input simultaneously; Cause phase mismatch, change couple state, thereby the control output light field switches between two output ports of directional coupler.Through changing the assembled state of input signal light polarization mode and corresponding input port, make and the corresponding output different logical of output waveguide effect realize the different logical function.
The utility model discloses a kind of all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire; Aim to provide that a kind of processing technology is simple, compact conformation, excellent performance, be easy to integrated all-optical logic gate design, can be used for fields such as optical information processing, optical communication and integrated optics.This device includes two input waveguides that are used for input signal light pulse and control light pulse; I.e. first input waveguide 1 and 2, two output waveguides of second input waveguide, i.e. first output waveguide 3 and second output waveguide 4; First mode converter 51; Nonlinear directional coupler 6, the second mode converters 52, wherein
First input waveguide 1 is connected with nonlinear directional coupler 6 through first mode converter 51 respectively with second input waveguide 2, and nonlinear directional coupler 6 is connected with second output waveguide 4 with first output waveguide 3 respectively through second mode converter 52.
The various combination input state of input waveguide and input light field polarization mode determined the corresponding output of output waveguide " non-", " with " and " or " etc. multiple different logical function.
With reference to figure 1; It shows the configuration of the utility model " non-" logic gate; Its principle of work is described below: luminous power is that signal A and the signal B of P incides first input waveguide 1 simultaneously; Signal gets into nonlinear directional coupler 6 through first mode converter 51, exports signals to second output waveguide 4 through second mode converter 52 at last.In the design, the signal A TM mode that is as the criterion, the signal B transverse electric mode that is as the criterion, signal power P is greater than the threshold power that can cause the nonlinear phase mismatch.When the pulse of signal A is the pulse of " 1 " and signal B during for " 0 ", from 4 outputs of second output waveguide, promptly signal C is " 1 " to signal A through nonlinear directional coupler 6; When the pulse of signal A and signal B all is " 1 ",, fully contact with nonlinear material in the groove because accurate transverse electric mode well is limited in the groove of three-flute vertical si base nano-wire waveguide; Because stronger Kerr nonlinearity effect, the light field that causes in the waveguide of three-flute vertical si base nano-wire, propagating produces nonlinear phase shift, therefore; Accurate transverse electric mode mould, promptly signal B can be from 4 outputs of second output waveguide, simultaneously; The signal B non-linear perturbation that on signal A, superposeed; Cause signal A phase mismatch, thereby signal A can not be coupled in second output waveguide 4 yet, promptly signal C is " 0 ".Therefore; In this case;
promptly realized " non-" NOT logic function, and its logical value is from 4 outputs of second output waveguide.Table 1 shows its truth table.Fig. 2 is the sectional view of nonlinear directional coupler 6; Nonlinear directional coupler 6 is to be made up of the waveguide of three-flute vertical si base nano-wire; Be filled with the si-nanocrystals material of Kerr nonlinearity effect in the groove; The directional coupler that three-flute vertical si base nano-wire waveguiding structure parameters of choice can guarantee its formation under linear case accurate transverse electric mode and accurate TM mode identical coupling length arranged, the length of nonlinear directional coupler 6 is chosen as the integral multiple of this coupling length.Fig. 3 a and Fig. 3 b are respectively the accurate transverse electric mode of three-flute vertical si base nano-wire waveguiding structure carrying and the electric field principal component mould field pattern of accurate TM mode, the electric field principal component E of accurate transverse electric mode
xWell be limited in the groove of three low-refractions, and the electric field principal component E of accurate TM mode
yThen be diffused in the covering of slot wave guide structure and gone, visible this structure is for the very strong light field limitation capability of having of accurate transverse electric mode, and for the light field limitation capability of accurate TM mode a little less than, therefore have stronger polarization correlated.
With reference to figure 4; It show the utility model " with " and " or " configuration of logic gate; Its principle of work is described below: luminous power is that signal A and the signal B of P incides first input waveguide 1 and second input waveguide 2 respectively; Two paths of signals gets into two incident ends of nonlinear directional coupler 6 respectively through first mode converter 51, export signals to first output waveguide 3 and second output waveguide 4 through second mode converter 52 at last.In the design, the signal A TM mode that is as the criterion, the signal B transverse electric mode that is as the criterion, signal power P is greater than the threshold power that can cause the nonlinear phase mismatch.When the pulse of signal A is the pulse of " 1 " and signal B during for " 0 ", this moment, situation was identical with linear case, and signal A exports from second output waveguide 4 through nonlinear directional coupler 6, and promptly signal C is " 0 ", and signal D is " 1 "; When the pulse of signal A is that the pulse of " 0 " and signal B is during for " 1 "; Because phase mismatch, signal B can not be coupled in first output waveguide 3 through behind the nonlinear directional coupler 6, but output from second output waveguide 4; Be that signal C is " 0 ", signal D is " 1 "; When the pulse of signal A and signal B all is " 1 "; Because the non-linear perturbation of signal B stack is when signal A propagates in nonlinear directional coupler 6, same owing to phase mismatch can not be coupled in second output waveguide 4; But output from first output waveguide 3; And still output from second output waveguide 4 of signal B, promptly signal C is " 1 ", signal D is " 1 ".Therefore, in this case, C=AB, D=A+B, promptly realized " with " AND with " or " logic function of OR, logical AND value is from 3 outputs of first output waveguide, logical "or" OR value is exported from second output waveguide 4.Table 2 shows its truth table.
Table 1
Table 2
More than be merely the preferred embodiment of the utility model, or not all within the spirit and principle of the utility model in order to restriction the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (3)
1. all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire is characterized in that: this device includes two input waveguides that are used for input signal light pulse and control light pulse, i.e. first input waveguide (1) and second input waveguides (2); Two output waveguides; I.e. first output waveguide (3) and second output waveguide (4), first mode converter (51), nonlinear directional coupler (6); Second mode converter (52), wherein
First input waveguide (1) is connected with nonlinear directional coupler (6) through first mode converter (51) respectively with second input waveguide (2), and nonlinear directional coupler (6) is connected with second output waveguide (4) with first output waveguide (3) respectively through second mode converter (52).
2. the all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire according to claim 1; It is characterized in that: nonlinear directional coupler (6) is made up of the waveguide of three-flute vertical si base nano-wire; Fill si-nanocrystals material in its groove with Kerr nonlinearity effect; First mode converter (51) is used to realize the mode switch between first input waveguide (1), second input waveguide (2) and the waveguide of three-flute vertical si base nano-wire, and second mode converter (52) is used to realize the mode switch between the base nano-wire waveguide of three-flute vertical si and first output waveguide (3), second output waveguide (4).
3. the all-optical logic gate device based on the waveguide of multiple-grooved silica-based nanowire according to claim 1; It is characterized in that: first input waveguide (1), second input waveguide (2), first output waveguide (3) and second output waveguide (4) are the silicon SOI ridge waveguide structure on the insulation course, and can carry accurate transverse electric mode and accurate TM mode simultaneously.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540625A (en) * | 2012-01-10 | 2012-07-04 | 东南大学 | All-optical logic gate device based on nanowire waveguides of multislot silicon substrate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540625A (en) * | 2012-01-10 | 2012-07-04 | 东南大学 | All-optical logic gate device based on nanowire waveguides of multislot silicon substrate |
| CN102540625B (en) * | 2012-01-10 | 2014-01-29 | 东南大学 | All-optical logic gate device based on nanowire waveguides of multislot silicon substrate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20140110 |