CN108535933A - A kind of all-optical logic gate based on Coupled Chaotic semiconductor laser - Google Patents
A kind of all-optical logic gate based on Coupled Chaotic semiconductor laser Download PDFInfo
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- CN108535933A CN108535933A CN201810392124.7A CN201810392124A CN108535933A CN 108535933 A CN108535933 A CN 108535933A CN 201810392124 A CN201810392124 A CN 201810392124A CN 108535933 A CN108535933 A CN 108535933A
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- beam splitter
- chaos
- laser
- logic gate
- photoelectric detector
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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
- G02F3/02—Optical bistable devices
- G02F3/026—Optical bistable devices based on laser effects
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- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of all-optical logic gates based on Coupled Chaotic semiconductor laser, including the first chaos laser, second chaos laser, first beam splitter, second beam splitter, fractional transmission speculum, first photoelectric detector, second photoelectric detector and operational amplifier, first chaos laser, first beam splitter, first photoelectric detector, operational amplifier is sequentially connected, second chaos laser, second beam splitter, second photoelectric detector, operational amplifier is sequentially connected, first beam splitter, second beam splitter is connect with the both sides of fractional transmission speculum respectively；The chaos carrier frequency of first chaos laser is divided into two bundles optical signal by first beam splitter, and the chaos carrier frequency of second chaos laser is divided into two bundles optical signal by second beam splitter.There are power errors between two lasers, detect the difference power between two lasers by photoelectric detector, can obtain the logic of system output.
Description
Technical field
The invention belongs to optical information technology fields, and in particular to a kind of full light based on Coupled Chaotic semiconductor laser is patrolled
Collect door.
Background technology
Chaos is a kind of class random process of determination, since its randomness makes chaos technology in secret communication, image
Encryption and signal detection etc. suffer from wide application prospect.In communication based on chaos technology, possess it is synchronous with
And the performance of robustness, the demodulation of signal can be used for.In the safe communication system that one is transmitted using chaotic carrier
In, semiconductor laser semiconductorlaser is usually used, SL, which intercouples, increases its degree of freedom to generate chaos letter
Number.And be the important devices of information processing, coding etc. in fully closed communication based on chaos coupled laser all-optical logic gate, based on steady
The logic gate of state laser and the logic gate of nonlinear fiber have had many successful stories, and patrolling based on chaos laser
Collect door has the advantages that safe, " 0 " and " 1 " contrast height, signal-to-noise ratio are high compared to other kinds of logic gate.
Invention content
The existing advantage of logic gate based on chaos laser, the present invention provides one kind being based on Coupled Chaotic semiconductor
The all-optical logic gate of laser has small, entirely compatible with optical fiber, anti-electricity using Coupled Chaotic semiconductor laser of the present invention
Magnetic disturbance ability, it is safe the advantages that, particularly suitable for the application in optical communication system technology.
The following technical solutions are specifically adopted by the present invention：
A kind of all-optical logic gate based on Coupled Chaotic semiconductor laser, including the first chaos laser, the second chaos
Laser, the first beam splitter, the second beam splitter, fractional transmission speculum, the first photoelectric detector, the second photoelectric detector
And operational amplifier, first chaos laser, the first beam splitter, the first photoelectric detector, operational amplifier connect successively
It connecing, second chaos laser, the second beam splitter, the second photoelectric detector, operational amplifier are sequentially connected, and described first
Beam splitter, the second beam splitter are connect with the both sides of fractional transmission speculum respectively；First beam splitter is by described
The chaos carrier frequency of one chaos laser is divided into two bundles optical signal, and second beam splitter is mixed second chaos laser
Ignorant carrier frequency is divided into two bundles optical signal.
Preferably, further include the first electric amplitude modulator and the second electric amplitude modulator, the described first electric amplitude modulator,
Second electric amplitude modulator is connect with the input terminal of the input terminal of first chaos laser, the second chaos laser respectively.
Preferably, further include the first variable optical attenuator and the second variable optical attenuator, first variable optical attenuator
Between first beam splitter, the first photoelectric detector, second variable optical attenuator is set on second light point
Between beam device, the second photoelectric detector.
Preferably, further include the first electric amplifier, the second electric amplifier, first electric amplifier is set on first light
Between photodetector, operational amplifier, second electric amplifier is set between the second photoelectric detector, operational amplifier.
Preferably, further include first filter, second filter, it is electrically amplified that the first filter is set to described first
Between device, operational amplifier, the second filter is set between second electric amplifier, operational amplifier.
Preferably, the gain of first electric amplifier, the second electric amplifier is 20dB.
Preferably, the splitting ratio of first beam splitter, the second beam splitter is all using 50:50.
Preferably, the bias current of first chaos laser, the second chaos laser is all using 17.3mA.
Preferably, the light feedback time of first chaos laser and the second chaos laser delay was 5 nanoseconds.
Preferably, the transparent carrier number of first chaos laser and the second chaos laser is 1.25 × 108。
Two different digital sequences of the present invention are hidden by modulating the bias current of laser in chaotic signal, then profit
The robustness of chaotic signal is generated with chaos laser, when two lasers input " 0 " or " 1 ", system is fully synchronized, two
The optical power difference of laser is 0；One is " 0 ", another is " 1 ", and there are power errors between two lasers, pass through photoelectricity
Detector detects the difference power between two lasers, can obtain the logic of system output.Two-laser input " 0 " or
When " 1 ", system output is " 0 ", and otherwise, system output is " 1 ".
Description of the drawings
Fig. 1 is a kind of all-optical logic gate structural schematic diagram based on Coupled Chaotic semiconductor laser.
Fig. 2 is the robustness schematic diagram for indicating two.
Specific implementation mode
Explanation is further described to technical scheme of the present invention below by specific embodiment.
As shown in Figure 1, present embodiment discloses a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser, first
Electric amplitude modulator 1-1, the second electric amplitude modulator 1-2, first laser device 2-1, second laser 2-2, the first beam splitter
3-1, the second beam splitter 3-2, fractional transmission-speculum 4, the first variable optical attenuator 5-1, the second variable optical attenuator 5-2,
First photoelectric detector 6-1, the second photoelectric detector 6-2, the first electric amplifier 7-1, the second electric amplifier 7-2, the first filtering
Device 8-1, second filter 8-2, operational amplifier 9.
In the all-optical logic gate of the present embodiment, first via input signal passes through the first electric amplitude modulator 1-1 modulation first
The bias current of laser 2-1, the electric amplitude modulator 1-1 first port b1 of the first electricity amplitude modulator 1-1 port a1 and first,
First laser device 2-1 second ports b2 is connect with the first ports beam splitter 3-1c1.First beam splitter 3-1 is by first laser device 2-1
The chaos carrier frequency of transmitting is allocated as two-way, and signal is connected to 4 port i1 of fractional transmission-speculum, fractional transmission-by optical fiber all the way
4 port i2 of speculum is connect with the second beam splitter 3-2 port c6.
In the all-optical logic gate of the present embodiment, the second tunnel input signal enters the second electric amplitude modulator 1-2 modulation second
The bias current of laser 2-2, the second electricity amplitude modulator 1-2 port a2 are connected to second laser 2-2 first port b3, the
Dual-laser device 2-2 second ports b4 is connect with the second beam splitter 3-1 port c4, and the second beam splitter 3-2 sends out second laser 2-2
The chaos carrier frequency penetrated is allocated as two-way, and signal is connected to 4 port i2 of fractional transmission-speculum by optical fiber all the way, and fractional transmission-is anti-
4 port i1 of mirror is penetrated to connect with the first beam splitter 3-1 port c3.
In the present embodiment, the first beam splitter 3-1 port c2 are connect with the first variable optical attenuator 5-1 port d1, pass through
Light is sent into the first photoelectric detector 6-1 port e1 by one variable optical attenuator 5-1 port d2, converts optical signals into electric signal,
First photoelectric detector 6-1 another port e2 are connect with the first electric amplifier 7-1 port f1, electric signal are amplified, first
Electric amplifier 7-1 port f2 are connected to the first electrical filter 8-1 port g1, first filter 8-1 another port g2 by circuit
It is connected to 9 port h1 of operational amplifier.Similarly, the second beam splitter 3-2 port c5 and the second variable optical attenuator 5-2 port d3
Light is sent into the second photoelectric detector 6-2 port e3, converted optical signals by connection, the second variable optical attenuator 5-2 port d4
Electric signal, the second photoelectric detector 6-1 another port e4 connect with the second electric amplifier 7-2 port f3, electric signal are put
Greatly, it is another by circuit to be connected to the second electrical filter 8-2 port g3, first filter 8-2 by the second electric amplifier 7-2 port f4
Port g4 is connected to 9 port h2 of operational amplifier.
The present embodiment has small and optical fiber by the all-optical logic gate of above-mentioned Coupled Chaotic semiconductor laser
It is full compatibility, anti-electromagnetic interference capability, safe.
The present invention is based on the all-optical logic gate courses of work of Coupled Chaotic semiconductor laser：
1, digital signal is modulated the bias current of laser, by Information hiding in chaotic signal.
2, according to coupled laser chaos robustness characteristic, two lasers are all sent when being " 0 " or " 1 ", system synchronization
Otherwise state is in desynchronizing state.
3, the optical power difference of two lasers detected when synchronous is 0, counterlogic " 0 ".When step-out, two lasers
Optical power difference be 0, counterlogic " 1 ".
The present invention constructs the optical logic gate of the robustness based on chaos coupled laser and logical value passes through detection two
The optical power difference of a laser is achieved.
In the present embodiment, the delay of two lasers is 5ns, current threshold 17.3mA, photon attenuation rate 496ns-1,
Carrier rate of decay 0.65ns-1, the differential gain 1.2 × 102ns-1, linewidth enhancement factor 3, transparent carrier number 1.25 ×
108, feedback factor 40ns-1, coefficient of coup 40ns-1。
Fig. 2 is the robustness schematic diagram for showing two.Wherein, a is chaos laser 2-1 input signal time series charts,
Chaos laser 2-2 does not have input signal at this time；B is the chaos laser 2-2 detected and chaos laser 2-1 difference powers
Time series chart.Under laser robustness, when laser is respectively 0 and 1, synchronization can not achieve between laser.Illustrating can
The logic of phase shift is realized with the difference power by detection laser, and XOR gate function is realized in this example.
Table 1 is the logical operation truth table realized.
| Laser 1 | Laser 2 | Output |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
It is above the preferred embodiment of the present invention, protection scope of the present invention is not limited, for people in the art
The deformation and improvement that member's mentality of designing according to the present invention is made, all should be considered as within protection scope of the present invention.
Claims (10)
1. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser, which is characterized in that including the first chaos laser
(2-1), the second chaos laser (2-2), the first beam splitter (3-1), the second beam splitter (3-2), fractional transmission-speculum
(4), the first photoelectric detector (6-1), the second photoelectric detector (6-2) and operational amplifier (9), first chaos laser
(2-1), the first beam splitter (3-1), the first photoelectric detector (6-1), operational amplifier (9) are sequentially connected, and described second is mixed
Ignorant laser (2-2), the second beam splitter (3-2), the second photoelectric detector (6-2), operational amplifier (9) are sequentially connected, institute
State the first beam splitter (3-1), the second beam splitter (3-2) is connect with the both sides of fractional transmission-speculum (4) respectively；It is described
The chaos carrier frequency of first chaos laser (2-1) is divided into two bundles optical signal, second light by the first beam splitter (3-1)
The chaos carrier frequency of second chaos laser (2-2) is divided into two bundles optical signal by beam splitter (3-2).
2. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1, which is characterized in that
Further include the first electric amplitude modulator (1-1) and the second electric amplitude modulator (1-2), the first electricity amplitude modulator (1-1),
Second electric amplitude modulator (1-2) respectively with the input terminal of first chaos laser (2-1), the second chaos laser (2-
2) input terminal connection.
3. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1 or 2, feature exist
In further including the first variable optical attenuator (5-1) and the second variable optical attenuator (5-2), the first variable optical attenuator (5-
1) it is set between first beam splitter (3-1), the first photoelectric detector (6-1), second variable optical attenuator (5-2)
Between second beam splitter (3-2), the second photoelectric detector (6-2).
4. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 3, which is characterized in that
Further include the first electric amplifier (7-1), the second electric amplifier (7-2), first electric amplifier (7-1) is set to first light
Between photodetector (6-1), operational amplifier (9), second electric amplifier (7-2) be set to the second photoelectric detector (6-2),
Between operational amplifier (9).
5. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 4, which is characterized in that
Further include first filter (8-1), second filter (8-2), the first filter (8-1) is set to first electric amplifier
Between (7-1), operational amplifier (9), the second filter (8-2) is set to second electric amplifier (7-2), operation amplifier
Between device (9).
6. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 4 or 5, feature exist
In the gain of first electric amplifier (7-1), the second electric amplifier (7-2) is 20dB.
7. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1 or 2, feature exist
50 are all used in the splitting ratio of, first beam splitter (3-1), the second beam splitter (3-2):50.
8. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1 or 2, feature exist
17.3mA is all used in the bias current of, first chaos laser (2-1), the second chaos laser (2-2).
9. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1 or 2, feature exist
In the light feedback time delay of first chaos laser (2-1) and the second chaos laser (2-2) was 5 nanoseconds.
10. a kind of all-optical logic gate based on Coupled Chaotic semiconductor laser according to claim 1 or 2, feature
It is, the transparent carrier number of first chaos laser (2-1) and the second chaos laser (2-2) is 1.25 × 108。
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| CN109088716A (en) * | 2018-09-29 | 2018-12-25 | 杭州电子科技大学 | A kind of two-way chaotic communication system based on vertical surface laser |
| CN109521624A (en) * | 2018-12-27 | 2019-03-26 | 五邑大学 | A kind of parallel all-optical digital chaos data selector |
| CN110086544A (en) * | 2019-05-06 | 2019-08-02 | 杭州电子科技大学 | A kind of all-optical intensity and electric light phase mixed chaos intercommunication system |
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| CN110086544A (en) * | 2019-05-06 | 2019-08-02 | 杭州电子科技大学 | A kind of all-optical intensity and electric light phase mixed chaos intercommunication system |
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