CN102789110A - Method and device for controlling swap gate - Google Patents
Method and device for controlling swap gate Download PDFInfo
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- CN102789110A CN102789110A CN2012102932904A CN201210293290A CN102789110A CN 102789110 A CN102789110 A CN 102789110A CN 2012102932904 A CN2012102932904 A CN 2012102932904A CN 201210293290 A CN201210293290 A CN 201210293290A CN 102789110 A CN102789110 A CN 102789110A
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Abstract
The invention belongs to the technology of optical signal processing, and relates to a method and a device for controlling a swap gate. The invention is realized by two non-linear optical waveguides with a three-order non-linear effect respectively, the input signal light and control light have four-wave mixing non-linear interaction in the non-linear optical waveguides, and the light waves output by the non-linear optical waveguides are selectively combined with one another to obtain the output for controlling the swap gate. Compared with the conventional realization scheme for controlling the swap gate, the invention is realized by the two non-linear optical waveguides, and the method and the device are simple and easy to realize, and are convenient to operate. The three-order non-linear effect used by the invention has femtosecond (fs) ultrafast response time, so that the work can be carried out under the condition of high speed (such as 160Gbit/s and higher speed).
Description
Technical field
The invention belongs to the light signal treatment technology, relate to a kind of realization of data exchange ways, be specifically related to a kind of implementation method and device of controlling the exchange logic door.
Background technology
In order to satisfy the needs of future communications and computing field, the light signal treatment technology is increasing entirely receives publicity.Optical non-linear effect is for realizing that various full light signal processing capacities provide an effective way.Based on basic logic gate such as with door or door, not gate, XOR gate, with or door, Sheffer stroke gate, rejection gate etc., some typical advanced logical operations more and more receive publicity, and comprise half adder, half-subtracter, data selector and control swap gate etc.Under extensive integrated megatrend, expectation can utilize simple device to realize these functions.
The control swap gate is a kind of calculating gate circuit that is applicable to reversible calculating.The control swap gate has universality, just means that also any logical operation and arithmetical operation all can be realized by the control swap gate.
The control swap gate provides the logical operation that realizes reversible calculating, and it has three input port A
In, B
In, C
InWith three output port A
Out, B
Out, C
OutInput port A
InAnd input port B
InImport the first via flashlight (carrying information A) and the second road flashlight (carrying information B) respectively, input port C
InInput control light (carrying information C).As input port C
InWhen control light is logical zero, output port A
OutThe light wave of output carries input port A
InThe information of flashlight, output port B
OutThe light wave of output carries input port B
InThe information of flashlight; As input port C
InWhen control light is logical one, output port A
OutThe light wave of output carries input port B
InThe information of flashlight, output port B
OutThe light wave of output carries input port A
InThe information of flashlight has promptly realized controllable exchange; In addition, output port C
OutThat export is input port C
InControl light.
Tradition is used to realize that the method for controlling swap gate implements comparatively complicated.If can find a kind of method and apparatus of realizing controlling swap gate, make it have the advantages that to be simple and easy to realize, then will have important value for the development that promotes future communications and computing field.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus of realizing controlling swap gate, the present invention is simple and easy to realize, can be operated under the high-speed case, is with good expansibility simultaneously.
A kind of method that realizes controlling swap gate provided by the invention is characterized in that, utilizes two non-linear optical waveguides with third-order non-linear effect, realizes being applicable to control exchange logic door reversible calculating, that have three input ports and three output ports.
Preferred as technique scheme; The process of this method is: first, second of control swap gate imported control light, first via flashlight and the second road flashlight successively with the 3rd input port; Let first via flashlight and control light get in first non-linear optical waveguide; Let the second road flashlight and said control light get in second non-linear optical waveguide; The first via flashlight of first non-linear optical waveguide output and the newborn ideler frequency light of second non-linear optical waveguide output are made up second output port output that offers the control swap gate; The newborn ideler frequency light of first non-linear optical waveguide output and the second road flashlight of second non-linear optical waveguide output are made up the 3rd output port output that offers the control swap gate, and said control light offers first output port output of control swap gate.
The device of realization control swap gate provided by the invention; It is characterized in that: this device comprises first to the 5th coupling mechanism, first, second non-linear optical waveguide, first, second Wave decomposing multiplexer; Wherein, first, second non-linear optical waveguide is the optical waveguide with third-order non-linear effect;
The input port of first coupling mechanism is the first input end mouth C of control swap gate
In, being used to receive the control light that carries information C, this control light also offers the first output port C of control swap gate
Out, its output information C ＇=C;
The first input end mouth of second coupling mechanism is the second input port A of control swap gate
In, being used to receive the first via flashlight that carries information A, second input port of second coupling mechanism is connected with first output port of first coupling mechanism;
The input port of first non-linear optical waveguide is connected with the output port of second coupling mechanism; The output port of first non-linear optical waveguide is connected with the input port of first Wave decomposing multiplexer; First output port of first Wave decomposing multiplexer is connected with the first input end mouth of the 4th coupling mechanism, and second output port of first Wave decomposing multiplexer is connected with the first input end mouth of the 5th coupling mechanism;
The first input end mouth of the 3rd coupling mechanism is connected with second output port of first coupling mechanism, and second input port of the 3rd coupling mechanism is the 3rd input port B of control swap gate
In, be used to receive the second road flashlight that carries information B;
The input port of second non-linear optical waveguide is connected with the output port of the 3rd coupling mechanism; The output port of second non-linear optical waveguide is connected with the input port of second Wave decomposing multiplexer; First output port of second Wave decomposing multiplexer is connected with second input port of the 4th coupling mechanism, and second output port of second Wave decomposing multiplexer is connected with second input port of the 5th coupling mechanism;
The input port of first non-linear optical waveguide is used to receive the first via flashlight and control light of second coupling mechanism, and the input port of second non-linear optical waveguide is used to receive the second road flashlight and control light of the 3rd coupling mechanism;
The output port of the 4th coupling mechanism is the second output port A of control swap gate
Out, its output information
Wherein
The logic NOT of expression C; The output port of the 5th coupling mechanism is the 3rd output port B of control swap gate
Out, its output information
As the improvement of technique scheme, first, second non-linear optical waveguide can have the optical waveguide of third-order non-linear effect for slit optical waveguide, strip optical waveguide, ridge optical waveguide or highly nonlinear optical fiber etc.
The present invention is based on the control swap gate that the nonlinear effect of fiber waveguide device realizes, requires fiber waveguide device to have the third-order non-linear effect.Particularly, the present invention has following beneficial effect:
1, than the implementation of traditional control swap gate, the present invention adopts two non-linear optical waveguides to realize, method and apparatus is simple and easy to realize, and is easy and simple to handle.
2, the production method of control swap gate according to the invention and device, the third-order non-linear effect of utilization has femtosecond (fs) the super fast response time, therefore can under high-speed case, work (like 160Gbit/s and above speed).
Description of drawings
Fig. 1 is the realization schematic diagram that the present invention is based on the control swap gate of two non-linear optical waveguides;
Fig. 2 is that the present invention controls the principle of work synoptic diagram of swap gate based on the four-wave mixing nonlinear effect;
Fig. 3 is the cross sectional representation of used slit optical waveguide in the instantiation;
Fig. 4 is the time domain waveform figure of the 160Gbit/s control swap gate simulated of the present invention;
Fig. 5 is the truth table that the present invention controls swap gate.
Embodiment
The inventive method is utilized two non-linear optical waveguides with third-order non-linear effect; Input two paths of signals light respectively in two non-linear optical waveguides with control light generation four-wave mixing nonlinear interaction, through two non-linear optical waveguide output light-waves are selectively made up the output with controlled swap gate.
Below through by embodiment the present invention being described in further detail, but following examples only are illustrative, and protection scope of the present invention does not receive the restriction of these embodiment.
In the inventive method, first via flashlight gets in first non-linear optical waveguide with control light, when first via flashlight exists with control light simultaneously, the four-wave mixing nonlinear interaction can take place, and makes both can be consumed and produce newborn ideler frequency light; When first via flashlight or control and the four-wave mixing nonlinear interaction can not take place when light is zero, the result of first non-linear optical waveguide output remains the light of input end input.The second road flashlight gets in second non-linear optical waveguide with control light, when the second road flashlight exists with control light simultaneously, also the four-wave mixing nonlinear interaction can take place, and makes both can be consumed and produce newborn ideler frequency light; When the second road flashlight or control and the four-wave mixing nonlinear interaction can not take place when light is zero, the result of second non-linear optical waveguide output remains the light of input end input.The output light-wave of two non-linear optical waveguide output terminals selectively made up to realize controlling swap gate.
As shown in Figure 1, the invention provides the method and apparatus of realizing controlling swap gate based on first non-linear optical waveguide and second non-linear optical waveguide.First non-linear optical waveguide and second non-linear optical waveguide can be single slit optical waveguide, many slits optical waveguide, strip optical waveguide, ridge optical waveguide etc., and the control swap gate of realization mainly is to utilize the third-order non-linear effect of optical waveguide.Therefore, promptly can be used for realizing the control swap gate as long as possess the optical waveguide of third-order non-linear effect.
The present invention provides a kind of method that realizes controlling swap gate, and embodiment is following:
Control light, first via flashlight and the second road flashlight are respectively by control swap gate first input end mouth C
In, the second input port A
InWith the 3rd input port B
InInput.First via flashlight gets in first non-linear optical waveguide with control light; When input first via flashlight is all logical one with control light (first via flashlight exists with control light simultaneously); Four-wave mixing nonlinear interaction (shown in Fig. 2 (a)) will take place with control light in first via flashlight; First via flashlight can be transferred to above two ideler frequency light of new generation with the luminous power of control light; Thereby make the first via flashlight and the optical power attenuation of control light fall, output is logical zero; When input first via flashlight has logical zero with control light (first via flashlight does not exist with control light simultaneously), can not produce the four-wave mixing nonlinear interaction this moment, and first via flashlight is constant with control light output logic.Visible according to above-mentioned analysis, first via flashlight can be expressed as respectively with the information (logical expression) that control light carries when first non-linear optical waveguide is exported
(wavelength X
ALocate) and
(wavelength X
CThe place) (wherein C and A are respectively first input end mouth C
InThe control light and the second input port A
InThe information that first via flashlight carries,
With
The logic NOT of representing C and A respectively).In addition, the ideler frequency light that is produced by the four-wave mixing nonlinear effect only just occurs when first via flashlight exists with control light simultaneously, so the information that newborn ideler frequency light carries (being logical expression) is AC (wavelength X
I1Or λ
I2The place), be the logical and of A and C.In like manner; The second road flashlight gets in second non-linear optical waveguide with control light; Through four-wave mixing nonlinear interaction (shown in Fig. 2 (b)), the second road flashlight can be expressed as respectively with the information (logical expression) that control light carries when second non-linear optical waveguide is exported
(wavelength X
BLocate) and
(wavelength X
CThe place) (wherein C and B are respectively first input end mouth C
InControl light and the 3rd input port B
InThe information that the second road flashlight carries,
With
The logic NOT of representing C and B respectively), the newborn ideler frequency light of the four-wave mixing information (being logical expression) of carrying is BC (wavelength X
I1Or λ
I2The place), be the logical and of B and C.With first non-linear optical waveguide and the second non-linear optical waveguide output light-wave selectively make up can controlled swap gate output, offer the second output port A of control swap gate
Out(
Wherein A ＇ is the second output port A
OutThe information that output light-wave carries) and the 3rd output port B
Out(
Wherein B ＇ is the 3rd output port B
OutThe information that output light-wave carries), the first output port C of control swap gate
OutOutput first input end mouth C
In(C ＇=C, wherein C is first input end mouth C to the control light of input
InThe information that control light carries, C ＇ is the first output port C
OutThe information that output light-wave carries).
Apparatus of the present invention are to realize a kind of device of control swap gate, specify as follows:
This device comprises first to the 5th coupling mechanism, first, second non-linear optical waveguide, first, second Wave decomposing multiplexer.The input port of first coupling mechanism is as the first input end mouth C of control swap gate
In, will control light after the input control light and be divided into two by two output port outputs of first coupling mechanism, the first input end mouth of second coupling mechanism is as the second input port A of control swap gate
InBe used to receive first via flashlight; Second input port of second coupling mechanism is connected with first output port of first coupling mechanism; The input port of first non-linear optical waveguide is connected with the output port of second coupling mechanism, and the output port of first non-linear optical waveguide is connected with the input port of first Wave decomposing multiplexer.The first input end mouth of the 3rd coupling mechanism is connected with second output port of first coupling mechanism, and second input port of the 3rd coupling mechanism is as the 3rd input port B of control swap gate
In, being used to receive the second road flashlight, the input port of second non-linear optical waveguide is connected with the output port of the 3rd coupling mechanism, and the output port of second non-linear optical waveguide is connected with the input port of second Wave decomposing multiplexer.The output port of first Wave decomposing multiplexer is connected with the first input end mouth of the 4th coupling mechanism and the first input end mouth of the 5th coupling mechanism, and the output port of second Wave decomposing multiplexer is connected with second input port of the 4th coupling mechanism and second input port of the 5th coupling mechanism.What the input port of the 4th coupling mechanism received is the isolated ideler frequency light of second Wave decomposing multiplexer of the isolated first via flashlight of first Wave decomposing multiplexer, and its output port is the second output port A of control swap gate
OutWhat the input port of the 5th coupling mechanism received is isolated ideler frequency light of first Wave decomposing multiplexer and isolated the second road flashlight of second Wave decomposing multiplexer, and its output port is the 3rd output port B of control swap gate
OutSaid control light also offers the first output port C of control swap gate
Out
The production method of the control swap gate of light signal treatment technology that is applicable to of the present invention adopts two slit optical waveguides to realize with device.Below in conjunction with specific embodiment the present invention is done further detailed description.
Embodiment uses two slit optical waveguides, mainly utilizes the nonlinear effect in the slit optical waveguide to realize.Slit optical waveguide such as Fig. 3 illustrate that its structural parameters are following: waveguide length L is 5mm, and duct width W is 250nm, and upper level Hu is 180nm, and the height H l of lower floor is 180nm, and middle slit layer height Hs is 35nm.Waveguide the upper and lower (label 1 among the figure) are high index of refraction silicon (Si) material, and middle slit layer (label 2 among the figure) is low-refraction silicon nanocrystal (Si-nc) material, and substrate (label 3 among the figure) is low refractive index silica (SiO
2) material.The leaded light zone is a low-refraction middle slit layer.Analog parameter in the following embodiment all adopts structural parameters in this example.
With the slit optical waveguide is the method that case introduction is realized the control swap gate.Specify as follows:
The time domain waveform of control three input ports of swap gate and three output ports is as shown in Figure 4.In numerical simulation, control swap gate first to the 3rd input port (C
In, A
In, B
In) successively the input control light (carrying information C), first via flashlight (carrying information A) and the second road flashlight (carrying information B) all adopt 160 Gbit/s pseudorandom (PRBS) NRZs (RZ).Control light, first via flashlight and the second road signal light wavelength are respectively 1555nm, 1551nm and 1553nm, and peak power is 250mw.Realized the control swap gate from Fig. 4 analog result is visible: as input port C
InWhen control light is logical zero, output port A
OutThe light wave of output carries input port A
InThe information of flashlight, output port B
OutThe light wave of output carries input port B
InThe information of flashlight; As input port C
InWhen control light is logical one, output port A
OutThe light wave of output carries input port B
InThe information of flashlight, output port B
OutThe light wave of output carries input port A
InThe information of flashlight, i.e. exchange has taken place in output.The truth table of gained analog result and control swap gate shown in Figure 5 matches.
The implement device of control swap gate according to the invention is elaborated with the slit optical waveguide below as an example:
As shown in Figure 1, control light (carrying information C) (is promptly controlled the first input end mouth C of swap gate by the input port of first coupling mechanism
In) input, control light is divided into two the output port outputs of two bundles by first coupling mechanism, and first via flashlight (carrying information A) (is promptly controlled the second input port A of swap gate by the first input end mouth of second coupling mechanism
In) input; Second input port of second coupling mechanism receives the control light of first output port output of first coupling mechanism; The output port of second coupling mechanism is connected with the input port of the first slit optical waveguide, and the information (logical expression) that first via flashlight (carrying information A) carries when exporting after the process four-wave mixing nonlinear interaction in the first slit optical waveguide with control light (carrying information C) can be expressed as respectively
With
The information (being logical expression) that the newborn ideler frequency light that is produced by four-wave mixing simultaneously carries is AC, and the output port of the first slit optical waveguide is input in first Wave decomposing multiplexer, and first Wave decomposing multiplexer is with first via flashlight (logical expression
) and ideler frequency light (logical expression AC) separate; The second road flashlight (carrying information B) (is promptly controlled the 3rd input port B of swap gate by second input port of the 3rd coupling mechanism
In) input; The first input end mouth of the 3rd coupling mechanism receives the control light of second output port output of first coupling mechanism; The output port of the 3rd coupling mechanism is connected with the input port of the second slit optical waveguide, and the information (logical expression) that the second road flashlight (carrying information B) carries when exporting after the process four-wave mixing nonlinear interaction in the second slit optical waveguide with control light (carrying information C) can be expressed as respectively
With
The information (being logical expression) that the newborn ideler frequency light that is produced by four-wave mixing simultaneously carries is BC, and the output port of the second slit optical waveguide is input in second Wave decomposing multiplexer, and second Wave decomposing multiplexer is with the second road flashlight (logical expression
) and ideler frequency light (logical expression BC) separate.The isolated first via flashlight of first Wave decomposing multiplexer (logical expression
) be input in the 4th coupling mechanism with the isolated ideler frequency light of second Wave decomposing multiplexer (logical expression BC), the output port of the 4th coupling mechanism is the second output port A of control swap gate
Out(output information
); Isolated ideler frequency light of first Wave decomposing multiplexer (logical expression AC) and the isolated the second road flashlight (logical expression of second Wave decomposing multiplexer
) be input in the 5th coupling mechanism, the output port of the 5th coupling mechanism is the 3rd output port B of control swap gate
Out(output information
), said control light also offers the first output port C of control swap gate
Out(output information C ＇=C).
The present invention not only is confined to above-mentioned embodiment; Persons skilled in the art can adopt other multiple embodiment embodiment of the present invention, therefore according to content disclosed by the invention; Every employing project organization of the present invention and thinking; Designs of doing some simple variations or changing (as be used for realizing multidigit control swap gate, or select for use other structures to have the optical waveguide of third-order non-linear effect), all fall into the scope that the present invention protects.
Claims (4)
1. a method that realizes controlling swap gate is characterized in that, utilizes two non-linear optical waveguides with third-order non-linear effect, realizes being applicable to control exchange logic door reversible calculating, that have three input ports and three output ports.
2. the method for realization control swap gate according to claim 1; It is characterized in that; First, second of control swap gate imported control light, first via flashlight and the second road flashlight successively with the 3rd input port; Let first via flashlight and control light get in first non-linear optical waveguide; Let the second road flashlight and said control light get in second non-linear optical waveguide; The first via flashlight of first non-linear optical waveguide output and the newborn ideler frequency light of second non-linear optical waveguide output are made up second output port output that offers the control swap gate, the newborn ideler frequency light of first non-linear optical waveguide output and the second road flashlight of second non-linear optical waveguide output are made up the 3rd output port output that offers the control swap gate, said control light offers first output port output of control swap gate.
3. device of realizing controlling swap gate; It is characterized in that: this device comprises first to the 5th coupling mechanism, first, second non-linear optical waveguide, first, second Wave decomposing multiplexer; Wherein, first, second non-linear optical waveguide is the optical waveguide with third-order non-linear effect.
The input port of first coupling mechanism is the first input end mouth C of control swap gate
In, being used to receive the control light that carries information C, this control light also offers the first output port C of control swap gate
Out, its output information C ＇=C;
The first input end mouth of second coupling mechanism is the second input port A of control swap gate
In, being used to receive the first via flashlight that carries information A, second input port of second coupling mechanism is connected with first output port of first coupling mechanism;
The input port of first non-linear optical waveguide is connected with the output port of second coupling mechanism; The output port of first non-linear optical waveguide is connected with the input port of first Wave decomposing multiplexer; First output port of first Wave decomposing multiplexer is connected with the first input end mouth of the 4th coupling mechanism, and second output port of first Wave decomposing multiplexer is connected with the first input end mouth of the 5th coupling mechanism;
The first input end mouth of the 3rd coupling mechanism is connected with second output port of first coupling mechanism, and second input port of the 3rd coupling mechanism is the 3rd input port B of control swap gate
In, be used to receive the second road flashlight that carries information B;
The input port of second non-linear optical waveguide is connected with the output port of the 3rd coupling mechanism; The output port of second non-linear optical waveguide is connected with the input port of second Wave decomposing multiplexer; First output port of second Wave decomposing multiplexer is connected with second input port of the 4th coupling mechanism, and second output port of second Wave decomposing multiplexer is connected with second input port of the 5th coupling mechanism;
The input port of first non-linear optical waveguide is used to receive the first via flashlight and control light of second coupling mechanism, and the input port of second non-linear optical waveguide is used to receive the second road flashlight and control light of the 3rd coupling mechanism;
The output port of the 4th coupling mechanism is the second output port A of control swap gate
Out, its output information
Wherein
The logic NOT of expression C; The output port of the 5th coupling mechanism is the 3rd output port B of control swap gate
Out, its output information
4. the device of realization control swap gate according to claim 3, it is characterized in that: first, second non-linear optical waveguide is slit optical waveguide, strip optical waveguide, ridge optical waveguide or highly nonlinear optical fiber.
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| CN106707657A (en) * | 2015-07-31 | 2017-05-24 | 兰州大学 | Control swap gate optical logic device based on micro-ring resonators |
| CN111240125A (en) * | 2020-01-16 | 2020-06-05 | 宁波大学 | Fredkin gate based on graphene surface plasmon polaritons |
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| CN111240125A (en) * | 2020-01-16 | 2020-06-05 | 宁波大学 | Fredkin gate based on graphene surface plasmon polaritons |
| CN111240125B (en) * | 2020-01-16 | 2022-05-20 | 宁波大学 | Fredkin gate based on graphene surface plasmon polaritons |
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