CN111474803A - All-optical XOR optical logic gate operation system based on time lens imaging - Google Patents
All-optical XOR optical logic gate operation system based on time lens imaging Download PDFInfo
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- CN111474803A CN111474803A CN202010258366.4A CN202010258366A CN111474803A CN 111474803 A CN111474803 A CN 111474803A CN 202010258366 A CN202010258366 A CN 202010258366A CN 111474803 A CN111474803 A CN 111474803A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 57
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- 239000013307 optical fiber Substances 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 9
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- 230000005684 electric field Effects 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
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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
- G02F3/00—Optical logic elements; Optical bistable devices
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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
- 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
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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
- 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
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Abstract
An all-optical XOR optical logic gate operation system based on time lens imaging comprises a code expansion subsystem, a time lens imaging inversion subsystem and a code reduction subsystem, wherein the output end of the code expansion subsystem is connected with the input end of the time lens imaging inversion subsystem, the output end of the time lens imaging inversion subsystem is connected with the input end of the code reduction subsystem, and a single code is converted into a double code in the code expansion subsystem; in the time lens imaging inversion subsystem, the inversion of the double-pulse signal is realized when the pumping signal is a '1' code through the magnification factor of-1 times when M is equal to the magnification factor of-1 times; in the time lens imaging inversion subsystem, when the pumping signal is '0' code, the inversion of the double-pulse signal is not realized; in the code reduction subsystem, double codes are changed back to single codes. The invention not only greatly simplifies the arithmetic system of the exclusive-OR optical logic gate, but also greatly improves the arithmetic speed.
Description
Technical Field
The invention relates to an all-optical XOR optical logic gate operation system based on time lens imaging
Background
With the development of ultra-high speed nonlinear optical signal processing technology, the traditional electrical signal processing technology approaches to the electronic rate bottleneck, and the use of optical logic gates instead of electrical logic gates has attracted people's interest. All-optical communication will be the main communication mode in the future, and all-optical logic technology makes the electrical/optical and optical/electrical conversion system with complex structure unnecessary, and directly adopts an all-optical processing system. An all-optical logic exclusive-or optical logic gate operation system is an important basic element of optical logic operation, and is an important device for realizing high speed of an all-optical network.
The time lens refers to an optical device capable of generating a secondary time phase shift on an optical signal, and the implementation of the time lens is various, but can be roughly classified into 4 types: the time lens based on electro-optic phase modulator (EOPM), the time lens based on cross phase modulation (XPM), the time lens based on four-wave mixing (FWM) and the time lens based on nonlinear crystal, but the sum and difference frequency effect has high requirement on material, so that the time lens has less application in practice, the signal is processed in the optical communication field, and the four-wave mixing (FWM) is preferably used to realize the time lens effect. Electric field amplitude of Es(t) and Ep(t) the signal light and the pump light have FWM effect, and the generated idle wave electric field amplitude
Idle light EidlerWith respect to the input signal light EsThe second order phase shift is introduced, which is the basic principle of FWM to produce temporal lensing.
The input section of the optical fiber (the second-order dispersion is phi ″)1＝β2sLs) Time lens (focal length dispersion phi ″)f＝-φ″p/2＝-β2pLp/2) and output section optical fiber (second-order dispersion is phi ″)2＝β2iLi) The three parts form a time lens imaging system. The dispersion of the front and rear optical fibers is phi ″', respectively1＝β2sLs，φ″2＝β2iLiThe focal length dispersion of the time lens is determined entirely by the dispersion experienced by the pump light, phi ″f＝-φ″p/2＝-β2pLp/2，β2s、β2iSecond order dispersion coefficients of two sections of optical fiber, β respectively2pIs pump light transmissionSecond order dispersion coefficient of optical fiber Ls、LiThe lengths of the front and rear optical fibers, L respectivelypIs the length of fiber that the pump light undergoes dispersion broadening. When the second-order dispersion phi of the two optical fibers1、φ″2Focal length dispersion phi' with time lensfSatisfies the imaging condition
Then, the amplification or compression of the input optical signal can be realized, wherein the amplification factor M ═ phi ″ "2/φ″1。
Disclosure of Invention
In order to overcome the defects of complex process, low optical logic gate speed and complicated whole system for realizing the all-optical logic operation function through the gain saturation characteristic of a semiconductor material in the prior art, the invention provides an all-optical XOR optical logic gate operation system based on time lens imaging, which can greatly simplify the whole system and greatly improve the operation speed.
In order to solve the technical problems, the invention adopts the technical scheme that:
an all-optical XOR optical logic gate operation system based on time lens imaging comprises a code expansion subsystem, a time lens imaging inversion subsystem and a code reduction subsystem, wherein the output end of the code expansion subsystem is connected with the input end of the time lens imaging inversion subsystem, the output end of the time lens imaging inversion subsystem is connected with the input end of the code reduction subsystem, and a single code is converted into a double code in the code expansion subsystem; in the time lens imaging inversion subsystem, the inversion of the double-pulse signal is realized when the pump light signal is coded by '1' through the magnification factor of-1 times; when the pumping light signal is '0' code, the inversion of the double-pulse signal can not be realized; in the code reduction subsystem, the double codes are restored back to the single codes; the signals are subjected to the combined action of three parts of an all-optical exclusive-or optical logic gate operation system, so that the logic exclusive-or operation can be realized, namely, the signal light is a '0' code when the pump light is a '1' code and the signal light is a '1' code, the signal light is a '1' code when the pump light is a '1' code and the signal light is a '0' code, the signal light is a '1' code when the pump light is a '0' code and the signal light is a '0' code.
Furthermore, the time lens imaging inversion subsystem is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2/φ″1Two signal light pulses can be covered simultaneously during the duration of the pump light pulse of the time lens imaging subsystem, and the two signal light pulses are inverted by M ═ 1, that is, "10" is converted into "01" and "01" is converted into "10".
Still further, in the time lens imaging inversion subsystem, a FWM is generated between the signal light and the pump light in a highly nonlinear medium to realize a time lens effect.
Preferably, the pump light pulse width is controlled so that one pump light pulse width can cover two time-length signal light pulse pairs, thereby realizing the inversion of double codes.
Still further, in the code spreading subsystem, a single code is converted into a double code, that is, a signal light 1 is converted into 01, and a signal light 0 is converted into 10; in the code reduction subsystem, double codes are changed back to single codes, namely, 01 is restored to 1, and 10 is restored to 0. Other single and double code conversion schemes may be used.
In the time lens imaging inversion subsystem, when a pump signal is a 1 code, the inversion of a double-pulse signal is realized, namely, the conversion from 10 to 01 and the conversion from 01 to 10 are realized; in the time lens imaging inversion subsystem, when a pumping signal is a '0' code, the inversion of a double-pulse signal is not realized, namely, the '10' is still '10' after the transformation of '10', and the '01' is still '01' after the transformation of '01'. Other inversion schemes may also be used.
The technical conception of the invention is as follows:firstly, the code spreading subsystem carries out code spreading, converts a signal light code of '1' into a code of '01', and converts a code of '0' into a code of '10'; in the time lens imaging inversion subsystem, when [ "] [")2＝-φ″1When the pump light pulse is a 1 code, the time reversal is realized after the double pulses pass through the time lens imaging system, namely, 10 is converted into 01, and 01 is converted into 10; when the pump light pulse is '0' code, the double pulse can not generate time inversion after passing through the time lens imaging system, namely, the double pulse is still '10' after the '10' conversion and still is '01' after the '01' conversion; finally, the dual signals are returned to the single signals through the code reduction subsystem, namely, the 01 is restored to the 1 code, and the 10 is restored to the 0 code. In a word, after the conversion of the whole system, the output signal obtained when the signal light and the pump light have the same pulse code is a '0' code, and the output signal obtained when the signal light and the pump light have different pulse codes is a '1' code, so that a brand-new implementation scheme is provided for realizing an all-optical XOR optical logic gate operation system based on the inversion characteristic of a time lens imaging system and two code expansion and contraction subsystems.
The invention has the beneficial effects that: after the optical signal passes through the code expanding subsystem, the time lens imaging inversion subsystem and the code shrinking subsystem, the logical XOR operation of the signal and the pump light can be realized, and the system has the advantage of particularly performing the logical operation on the ultra-high-speed optical signal.
Drawings
FIG. 1 is a system diagram of the present invention, which includes a code spreading subsystem, a time lens imaging inversion subsystem, and a code shrinking subsystem.
Fig. 2 is a schematic diagram of time-lens inversion, where a pair of light pulses obtains an inversion in time when the magnification M is-1.
Fig. 3 is a schematic diagram of inversion of a pair of optical pulses (01) having a pulse width of 4ps when the pump optical pulses are "1" code, where (a) is the input signal pulse "01" and (b) is the output signal pulse "10", through the time lens imaging subsystem.
Fig. 4 is a schematic diagram of inversion of a pair of optical pulses (10) having a pulse width of 4ps when the pump optical pulses are "1" code, where (a) is the input signal pulse "10" and (b) is the output signal pulse "01", through the time lens imaging subsystem.
Fig. 5 is a schematic diagram of inversion of a pair of optical pulses (01) having a pulse width of 4ps when the pump optical pulses are "0" codes, where (a) is the input signal pulse "01" and (b) is the output signal pulse "01", through the time lens imaging subsystem.
Fig. 6 is a schematic diagram of inversion of a pair of optical pulses (10) having a pulse width of 4ps when the pump optical pulses are "0" code, where (a) is the input signal pulse "10" and (b) is the output signal pulse "10", through the time lens imaging subsystem.
Detailed Description
The invention will be further explained by means of embodiments in conjunction with the attached drawings, without limiting the scope of the invention thereto.
Referring to fig. 1 to 6, an all-optical xor optical logic gate operation system based on time lens imaging includes a code expansion subsystem, a time lens imaging inversion subsystem and a code reduction subsystem; the code spreading subsystem converts signal light 1 into 01 and converts signal light 0 into 10, and the method is very common in the current signal processing and communication fields, so the implementation process is not repeated here; the time lens imaging inversion subsystem is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2φ″1-1; controlling the width of the pump light pulse to enable the duration of the pump light pulse to cover two signal light pulses, thereby ensuring that a pair of light pulses 10 can be inverted into 01 when the pump light signal is a 1 code, and inverted into 10 when the pump light signal is a 01 code; a pair of optical pulse '10' changes without inversion when the pump optical signal is '0' codeAfter the transformation, the number is still 10, and after the transformation, the number is still 01; the code reduction subsystem restores the double codes to the single codes, namely, the 01 is restored to the 1, and the 10 is restored to the 0, which is similar to the code expansion, and the implementation process is not repeated here.
In the time lens imaging inversion subsystem, the FWM of signal light and pump light occurs in a high nonlinear medium to realize the time lens effect. Preferably, the pump light pulse width is controlled so that one pump light pulse width can cover two time-length signal light pulse pairs, thereby realizing the double-code inversion.
Referring to FIG. 2, to satisfy
The parameters of both temporal lens imaging subsystems are chosen to be β2s＝20ps2/km，Ls＝1km，β2i＝-20ps2/km，Li＝1km，β2p＝20ps2/km，Lp1 km. At this time, phi ″)2＝-φ″1，M＝-1。
As shown in fig. 1 to 6, the output signal obtained when the signal light and the pump light have the same pulse code is a "0" code, and the output signal obtained when the signal light and the pump light have different pulse codes is a "1" code, so that the logical exclusive-or operation is implemented. In the above embodiments, the optical pulse width is shortened, i.e. the signal processing rate is increased, and the system performance is good, i.e. the system can effectively process high-speed optical digital signals, and realize the logical exclusive-or operation.
Claims (6)
1. An all-optical XOR optical logic gate operation system based on time lens imaging is characterized by comprising a code expansion subsystem, a time lens imaging inversion subsystem and a code reduction subsystem, wherein the output end of the code expansion subsystem is connected with the input end of the time lens imaging inversion subsystem, the output end of the time lens imaging inversion subsystem is connected with the input end of the code reduction subsystem, and a single code is converted into a double code in the code expansion subsystem; in the time lens imaging inversion subsystem, the inversion of the double-pulse signal is realized when the pumping signal is a '1' code through the magnification factor of-1 times when M is equal to the magnification factor of-1 times; in the time lens imaging inversion subsystem, when the pumping signal is '0' code, the inversion of the double-pulse signal is not realized; in the code reduction subsystem, double codes are changed back to single codes; the signals are subjected to the combined action of three parts of an all-optical exclusive-or optical logic gate operation system, so that the logic exclusive-or operation can be realized, namely, the signal light is a '0' code when the pump light is a '1' code and the signal light is a '1' code, the signal light is a '1' code when the pump light is a '1' code and the signal light is a '0' code, the signal light is a '1' code when the pump light is a '0' code and the signal light is a '0' code.
2. The all-optical XOR optical logic gate operation system based on time lens imaging as claimed in claim 1, wherein the time lens imaging inversion subsystem is composed of three parts of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi' of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2/φ″1Two signal light pulses can be covered simultaneously during the duration of the pump light pulse of the time lens imaging subsystem, and the inversion of the two signal light pulses is realized by M-1.
3. An all-optical exclusive-or optical logic gate operating system based on time lens imaging as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsystem, the FWM of signal light and pump light occurs in a high nonlinear optical fiber to realize the time lens effect.
4. An all-optical exclusive-or optical logic gate operating system based on time lens imaging as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsystem, the width of a pump light pulse is controlled, so that one pump light pulse width can cover two signal light widths at the same time.
5. An all-optical exclusive-or optical logic gate operating system based on time lens imaging as claimed in claim 1 or 2, characterized in that: in the code spreading subsystem, a single code is converted into a double code, namely, a signal light 1 is converted into 01, and a signal light 0 is converted into 10; in the code reduction subsystem, double codes are changed back to single codes, namely, 01 is restored to 1, and 10 is restored to 0.
6. An all-optical exclusive-or optical logic gate operating system based on time lens imaging as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsystem, when a pump signal is a 1 code, the inversion of a double-pulse signal is realized, namely, the conversion from 10 to 01 and the conversion from 01 to 10 are realized; in the time lens imaging inversion subsystem, when a pumping signal is a '0' code, the inversion of a double-pulse signal is not realized, namely, the '10' is still '10' after the transformation of '10', and the '01' is still '01' after the transformation of '01'.
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2020
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