WO2020133612A1 - 一种并行全光数字混沌数据选择器 - Google Patents

一种并行全光数字混沌数据选择器 Download PDF

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WO2020133612A1
WO2020133612A1 PCT/CN2019/072303 CN2019072303W WO2020133612A1 WO 2020133612 A1 WO2020133612 A1 WO 2020133612A1 CN 2019072303 W CN2019072303 W CN 2019072303W WO 2020133612 A1 WO2020133612 A1 WO 2020133612A1
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optical
beam splitter
output end
laser light
optical beam
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French (fr)
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钟东洲
杨广泽
郁勤
曾能
杨华
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Wuyi University Fujian
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals

Definitions

  • the invention relates to electronic and photonic equipment, in particular to a parallel all-optical digital chaotic data selector.
  • Optical injection or optical feedback vertical cavity surface emitting lasers can generate high-dimensional, large-bandwidth chaotic dynamic behavior.
  • VCSELs vertical cavity surface emitting lasers
  • basic or more complex logical functions can be performed.
  • the polarization bistable state injected into the vertical cavity surface emitting laser provides the possibility for the VCSEL chaotic system to expand into a new application-chaos calculation.
  • its chaotic dynamic behavior can be widely applied to "chaotic radar ranging", “chaotic storage pool”, “chaotic secure communication”, “chaotic neural network” and other fields.
  • all-optical chaotic data selectors In the signal exchange and signal processing of all-optical chaotic networks, the complex combination of all-optical chaotic logic operations, such as all-optical chaotic data selectors and all-optical chaotic decoders, plays an important role.
  • the all-optical chaotic data selector is used in conjunction with other basic all-optical chaotic logic devices to achieve a more complex combination of all-optical chaotic logic functions and all-optical timing chaotic logic functions, such as all-optical chaotic triggers, all-optical chaotic counters, etc. , This is conducive to promoting the practical process of all-optical chaotic secure communication network system.
  • the all-optical chaotic data selector has received little attention. There have been no reports so far. It is necessary to explore a new mechanism and new optical path to realize the all-optical chaotic data selector.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a parallel all-optical digital chaotic data selector.
  • a parallel all-optical digital chaotic data selector including a first electrical amplifier, a first low-pass filter, a first photoelectric converter, a second electrical amplifier, a second Low-pass filter, second photoelectric converter, third electric amplifier, third low-pass filter, third photoelectric converter, electronic data selector, sampling grating distributed Bragg reflector laser, first optical coupler, second light Coupler, vertical cavity surface emitting laser;
  • a first optical isolator, a first optical beam splitter, a second optical beam splitter, a first variable attenuator, and a second variable are provided between the sampling grating distributed Bragg reflector laser and the first optical coupler Attenuator, third variable attenuator, third optical beam splitter, fourth optical beam splitter, fifth optical beam splitter; there is a first polarization between the first optical coupler and the second optical coupler A beam splitter, a first Faraday rotator, and a first half-wave plate; a sixth optical beam splitter, a fourth variable attenuator, and a second Faraday rotation between the second optical coupler and the vertical cavity surface emitting laser A second optical half-wave plate and a fifth variable attenuator; a second optical isolator and a second polarization beam splitter are further arranged behind the vertical cavity surface emitting laser.
  • the first optical isolator is disposed between the sampling grating distributed Bragg reflector laser and the first optical beam splitter, and the sampling grating distributed Bragg reflector laser transmits the generated laser light to the first optical beam splitter through the first optical isolator .
  • One output end of the first optical beam splitter transmits laser light to the second optical beam splitter; the other output end of the first optical beam splitter transmits laser light to the fifth optical beam splitter through a third variable attenuator;
  • One output end of the second optical beam splitter transmits laser light to the fourth optical beam splitter through the second variable attenuator, and the other output end of the second optical beam splitter transmits laser light to the fourth variable beam attenuator to Third beam splitter;
  • One output end of the third optical beam splitter transmits laser light to the second photoelectric converter, and the output end of the second photoelectric converter is connected to the electronic data selector through the second low-pass filter and the second electric amplifier in sequence;
  • the other output end of the three-beam splitter transmits laser light to the first optical coupler;
  • One output end of the fourth optical beam splitter transmits laser light to the first photoelectric converter, and the output end of the first photoelectric converter is connected to the electronic data selector through the first low-pass filter, the first electric amplifier in sequence;
  • the other output end of the four-beam splitter transmits laser light to the first optical coupler;
  • One output end of the fifth optical beam splitter transmits laser light to the third photoelectric converter, and the output end of the third photoelectric converter is connected to the electronic data selector through a third low-pass filter, a third electric amplifier in sequence;
  • the other output end of the five-beam splitter transmits laser light to the first optical coupler;
  • the output end of the electronic data selector is connected to a sampling grating distributed Bragg reflection laser.
  • the output end of the first optical coupler transmits laser light to the first polarization beam splitter, one output end of the first polarization beam splitter transmits laser light to the second optical coupler; another type of output of the first polarization beam splitter
  • the laser beam is transmitted to the second optical coupler through the first Faraday rotator and the first half-wave plate.
  • the output end of the second optical coupler transmits laser light to the sixth optical beam splitter, and one output end of the sixth optical beam splitter transmits laser light to the vertical cavity surface emitting laser via the fourth variable attenuator; the sixth beam splitter The other output end of the device transmits laser light to the surface of the vertical cavity through the second Faraday rotator, the second half-wave plate, and the fifth variable attenuator.
  • the output end of the vertical cavity surface emitting laser transmits laser light to the second polarization beam splitter through the second optical isolator, and the second polarization beam splitter performs polarization output.
  • the present invention can realize the selection output of the dual-channel digital chaotic signal by controlling the input of the selection channel signal, complete the data selection function for the parallel all-optical digital chaotic signal, and can be popularized and applied to the all-optical chaotic trigger, All-optical chaos counter.
  • Figure 1 is a schematic structural diagram of the present invention
  • Figure 2 is a chaotic geographic map of a parallel all-optical digital chaotic data selector
  • Figure 3 shows the evolution of the bistable state of the two polarization components with E inj under the frequency detuning of -40 GHz and 40 GHz;
  • FIG. 4 is the relationship between the frequency detuning between the sampling grating distributed Bragg reflector laser 11 and the vertical cavity surface emitting laser 14 and the amplitude of the injected light field;
  • Figure 5 shows the relationship between the input signal of the parallel all-optical digital chaotic data selector and the logic control signal
  • Figure 6 is the parallel all-optical digital chaotic data selector x polarization output amplitude and the digital signal Y 1 output after threshold judgment;
  • a parallel all-optical digital chaotic data selector includes a first electrical amplifier 1, a first low-pass filter 2, a first photoelectric converter 3, a second electrical amplifier 4, a second low-pass filter 5, second photoelectric converter 6, third electric amplifier 7, third low-pass filter 8, third photoelectric converter 9, electronic data selector 10, sampling grating distributed Bragg reflection laser 11, first optical coupler 12.
  • a first optical isolator 15, a first optical beam splitter 16, a second optical beam splitter 17, and a first variable attenuator are provided between the sampling grating distributed Bragg reflector laser 11 and the first optical coupler 12 18.
  • Second variable attenuator 19 third variable attenuator 20, third optical beam splitter 21, fourth optical beam splitter 22, fifth optical beam splitter 23; the first optical coupler 12
  • the sixth optical beam splitter 27, the fourth variable attenuator 28, the second Faraday rotator 29, the second half-wave plate 30 and the fifth variable attenuator 31; the vertical cavity surface emitting laser 14 is further provided with The second optical isolator 32 and the second polarization beam splitter 33.
  • the first optical isolator 15 is disposed between the sampling grating distributed Bragg reflection laser 11 and the first optical beam splitter 16, and the sampling grating distributed Bragg reflection laser 11 splits the first optical beam through the first optical isolator 15
  • the transmitter 16 transmits the generated laser light.
  • One output end of the first optical beam splitter 16 transmits laser light to the second optical beam splitter 17; the other output end of the first optical beam splitter 16 transmits laser light to the fifth light through the third variable attenuator 20 Beam splitter 23;
  • One output end of the second optical beam splitter 17 transmits laser light to the fourth optical beam splitter 22 through the second variable attenuator 19, and the other output end of the second optical beam splitter 17 passes the first variable attenuation
  • the laser 18 transmits the laser to the third optical beam splitter 21;
  • One output end of the third optical beam splitter 21 transmits laser light to the second photoelectric converter 6, and the output end of the second photoelectric converter 6 sequentially passes through the second low-pass filter 5, the second electric amplifier 4, and the electronic data
  • the selector 10 is connected; the other output end of the third optical beam splitter 21 transmits laser light to the first optical coupler 12;
  • An output end of the fourth optical beam splitter 22 transmits laser light to the first photoelectric converter 3, and the output end of the first photoelectric converter 3 sequentially passes through the first low-pass filter 2, the first electrical amplifier 1, and the electronic data
  • the selector 10 is connected; the other output end of the fourth optical beam splitter 22 transmits laser light to the first optical coupler 12;
  • One output end of the fifth optical beam splitter 23 transmits laser light to the third photoelectric converter 9, and the output end of the third photoelectric converter 9 passes through the third low-pass filter 8, the third electric amplifier 7 and the electronic data in sequence
  • the selector 10 is connected; the other output end of the fifth optical beam splitter 23 transmits laser light to the first optical coupler 12;
  • the output end of the electronic data selector 10 is connected to a sampling grating distributed Bragg reflection laser 11.
  • the output end of the first optical coupler 12 transmits laser light to the first polarization beam splitter 24, and the output end of the first polarization beam splitter 24 transmits laser light to the second optical coupler 13; the first polarization beam splitter 24
  • the other type of output end transmits the laser light to the second optical coupler 13 via the first Faraday rotator 25 and the first half-wave plate 26.
  • the output end of the second optical coupler transmits laser light to the sixth optical beam splitter 27, and one output end of the sixth optical beam splitter 27 transmits laser light to the vertical cavity surface emitting laser 14 via the fourth variable attenuator 28;
  • the other output end of the sixth beam splitter 27 transmits laser light to the vertical cavity surface emitting laser 14 via the second Faraday rotator 29, the second half-wave plate 30, and the fifth variable attenuator 31.
  • the output end of the vertical cavity surface emitting laser 14 transmits laser light to the second polarization beam splitter 33 through the second optical isolator 32, and the second polarization beam splitter 33 performs polarization output.
  • the working principle of the present invention is as follows: the sampling grating distributed Bragg reflector laser 11, as a tunable laser, generates light with different center frequencies under the action of different polarization currents.
  • the first optical isolator 15 is used to prevent the first optical beam splitter 16 from generating optical feedback
  • the second optical isolator 32 is used to prevent the second polarization beam splitter 33 from generating optical feedback.
  • the first beam splitter 16 splits the external light from the sampling grating distributed Bragg reflection laser 11 into two beams. One of the beams is injected into the fifth beam splitter 23 after the light intensity is changed by the third variable attenuator 20; the other beam is separated into two beams by the second beam splitter 17 again.
  • the light intensity is changed by the first variable attenuator 18 and the second variable attenuator 19, respectively, and then injected into the third optical beam splitter 21 and the fourth optical beam splitter 22, respectively.
  • the two beams separated from the fourth beam splitter 22 and the third beam splitter 21 are compiled into two logical inputs I 1 and I 2 respectively ; the one beam separated by the fifth beam splitter 23 It is compiled into a clock signal I c .
  • the first optical coupler 12 couples the three beams of light representing the signals I 1 , I 2 and I c into one beam.
  • the light output by the first optical coupler 12 is divided into x-polarized light and y-polarized light by the first polarizing beam splitter 24, wherein the x-polarized light is directly injected into the second optical coupler 13, and the y-polarized light passes through the first Faraday
  • the rotator 25 and the first half-wave plate 26 are converted into x-polarized light and then injected into the second optical coupler 13.
  • the second optical coupler 13 couples the above two beams of light into one beam and the signal light is x-polarized light at this time.
  • the sixth beam splitter 27 separates the x-polarized light from the second optical coupler 13 into two beams, one of which is directly injected into the vertical cavity surface emitting laser 14 after the light intensity is changed by the fourth variable attenuator 28 In the x-polarized component, another beam of light is converted into y-polarized light by the second Faraday rotator 29 and the second half-wave plate 30, and then the light intensity is changed by the fifth variable attenuator 31 and then injected into the vertical cavity surface emitting laser 14. y polarization component.
  • the output of the vertical cavity surface emitting laser 14 is divided into two chaotic polarization components by the second polarization beam splitter 33, and these two chaotic polarization outputs are compiled into two logical outputs Y 1 and Y of the parallel all-optical digital chaotic data selector. Y 2 .
  • the frequency detuning ⁇ ( ⁇ 1 + ⁇ 2 ) between the sampling grating distributed Bragg reflector laser 11 and the vertical cavity surface emitting laser 14 is used as the control logic signal C, where ⁇ 1 And ⁇ 2 are generated when the injection currents of the sampling grating distributed Bragg reflector laser 11 are ⁇ 01 and ⁇ 02 , respectively.
  • the system can generate two parallel data selection operations.
  • the specific control scheme for the data selection relationship between C and I 1 , I 2 and I c is as follows: the other three separated by the fourth optical beam splitter 22, the third optical beam splitter 21 and the fifth optical beam splitter 23
  • the beams of light are converted into current signals i 1 , i 2 and i c by the first photoelectric converter 3, the second photoelectric converter 6 and the third photoelectric converter 9 respectively, and then they pass through the first low-pass filter 2 and the second
  • the second low-pass filter 5 and the third low-pass filter 8 perform filtering, and the filtered three signals are then compiled into electronics after being amplified by the first electrical amplifier 1, the second electrical amplifier 4, and the third electrical amplifier 7 respectively.
  • the rate equation of the external light injected into the vertical cavity surface emitting laser 14 can be expressed by the following equation:
  • ⁇ inj is the angular frequency of the injected light field
  • ⁇ ref is the reference angular frequency, defined as ( ⁇ x + ⁇ y )/2
  • ⁇ x (- ⁇ p +a ⁇ a )
  • ⁇ y ( ⁇ p -a ⁇ a ) are the angular frequencies of the x and y polarized light under the free operation of the vertical cavity surface emitting laser 14.
  • Figure 2 shows the chaotic geographic map of the parallel all-optical digital chaotic data selector.
  • CO indicates that the system is in chaotic state
  • QP indicates quasi-periodic oscillation
  • P 2 indicates double-period oscillation
  • P 1 indicates single-period oscillation.
  • E inj E i1 +E i2 +E ic .
  • E i1 , E i2 and E ic are sequentially used to compile into logical digital input signals I 1 , I 2 and data selection signal I c .
  • the logic input may be 0 or 1
  • E inj1 (E inj2 - ⁇ E inj ) represents (0, 0, 0); E inj2 represents (0, 0, 1), (0, 1 , 0) and (1, 0, 0); E inj3 (E inj2 + ⁇ E inj ) means (0, 1, 1), (1, 0, 1) and (1, 1, 0); E inj4 (E inj2 +2 ⁇ E inj ) represents (1, 1, 1).
  • the four standard signals are constant within a period T, where T is set to 10 ns, that is, the speed of the logic device is 0.1 GHz.
  • T 10 ns
  • a threshold mechanism For the output of the parallel all-optical digital chaotic data selector, a threshold mechanism is used here. Assuming that the mean square error (MSEs) of the light intensity E x output by the vertical cavity surface emitting laser x polarization component is ⁇ x , and the MSEs of the light intensity E y output by the y polarization component is ⁇ y , consider that both the logical outputs Y 1 and Y 2 The same threshold M, and it is 0.1.
  • MSEs mean square error
  • the data logic selection operation of the sampling grating distributed Bragg reflector laser bias current and feedback currents i 1 , i 2 and i C is controlled by an electrical data selector, which indirectly obtains ⁇ and E i1 , E i2 and E ic data selects operation logic relationship.
  • ⁇ x max is 0.0262, 0.0322, 0.0308 and 0.0281, respectively
  • ⁇ y max is 0.0751, 0.0712, 0.0806 and 0.0376, respectively.
  • Figure 2 shows the chaotic geographic map of the parallel all-optical digital chaotic data selector.
  • Figure 2(a) is the x-PC output of the system, and Figure 2(b) is the y-PC output.
  • CO chaotic state
  • QP quasi-periodic oscillation
  • P 2 double-period oscillation
  • P 1 single-period oscillation
  • the solid line represents the x-PC output; the dotted line represents the y-PC output.
  • the arrow indicates the location of the four standard signals used to compile the logic input;
  • FIG. 4 shows the relationship between the frequency detuning between the sampling grating distributed Bragg reflector laser 11 and the vertical cavity surface emitting laser 14 and the amplitude of the injected light field.
  • Dashed line the frequency detuning between the sampling grating distribution Bragg reflector laser 11 and the vertical cavity surface emitting laser 14.
  • Solid line injection light field amplitude.
  • Figure 5 shows the relationship between the signals I 1 , I 2 and I c input by the parallel all-optical digital chaotic data selector and the logic control signal C.
  • Figure 6 shows the x-polarized output of the parallel all-optical digital chaotic data selector.
  • Solid line the amplitude E x (t) of the x-polarized light emitted by the vertical cavity surface emitting laser 14.
  • Dashed line Digital signal Y 1 (t) output after threshold judgment.
  • Figure 7 shows the y-polarized output of the parallel all-optical digital chaotic data selector.
  • Solid line the amplitude E y (t) of the y-polarized light emitted by the vertical cavity surface emitting laser 14.
  • Dashed line digital signal Y 2 (t) output after threshold judgment.

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Abstract

本发明公开了一种并行全光数字混沌数据选择器,包括电子数据选择器，采样光栅分布布拉格反射激光器、光耦合器、垂直腔表面发射激光器、光隔离器、光分束器、偏振分束器、可变衰减器、光电转换器、低通滤波器、电放大器、法拉第旋转器、半波片。本发明通过控制选择通道信号的输入能够实现双通道数字混沌信号的选择输出，完成对于并行全光数字混沌信号的数据选择功能，可推广应用到全光混沌触发器、全光混沌计数器中。

Description

一种并行全光数字混沌数据选择器 技术领域
本发明涉及电子与光子设备，特别是涉及一种并行全光数字混沌数据选择器。
背景技术
光注入或光反馈垂直腔表面发射激光器(VCSEL)可以产生高维度、大带宽的混沌动力行为，通过利用嵌入到激光器混沌系统中丰富的模式，可以执行基本或更为复杂的逻辑功能，其中光注入垂直腔表面发射激光器的偏振双稳态为VCSEL混沌系统拓展新的应用—混沌计算提供了可能。目前利用其混沌动力行为可推广应用到“混沌雷达测距”、“混沌存储池”、“混沌保密通信”、“混沌神经网络”等领域。现阶段一些研究人员已经实现了利用不同VCSEL激光器混沌系统装置原理进行基本的混沌逻辑“与”、“或”、“非”运算；利用基于驱动-响应混沌激光系统同样也实现了一些基本逻辑运算，如“同或门”、“或非门”等。然而，上述混沌逻辑操作基于各种机制(如偏振转换，混沌同步，偏振双稳态)仅实现了基本的混沌逻辑运算，有必要对于一些较为复杂的组合混沌逻辑运算进行探索。
在全光混沌网络中信号交换和信号处理中，复杂组合全光混沌逻辑运算，如全光混沌数据选择器，全光混沌译码器等，扮演着重要的角色。全光混沌数据选择器与其它基本的全光混沌逻辑器件配合使用，可以实现更为复杂的组合全光混沌逻辑功能和全光时序混沌逻辑功能，如全光混沌触发器，全光混沌计数器等，这有利于推进全光混沌保密通信网络系统的实用化进程。然而，全光混沌数据选择器很少被关注，至今未见相关的报道，有必要探索一种新的机制原理和新的光路来实现全光混沌数据选择器。
发明内容
本发明的目的在于克服现有技术的不足，提供一种并行全光数字混沌数据选择器。
本发明的目的是通过以下技术方案来实现的：一种并行全光数字混沌数据选择器，包括第一电放大器、第一低通滤波器、第一光电转换器、第二电放大器、第二低通滤波器、第二光电转换器、第三电放大器、第三低通滤波器、第三光电转换器、电子数据选择器、采样光栅分布布拉格反射激光器、第一光耦合器、第二光耦合器、垂直腔表面发射激光器；
所述的采样光栅分布布拉格反射激光器与第一光耦合器之间设置有第一光隔离器、第一光分束器、第二光分束器、第一可变衰减器、第二可变衰减器、第三可变衰减器、第三光分束器、第四光分束器、第五光分束器；所述第一光耦合器与第二光耦合器之间有第一偏振分束器、第一法拉第旋转器和第一半波片；所述第二光耦合器与垂直腔表面发射激光器之间有第六光分束器、第四可变衰减器、第二法拉第旋转器、第二半波片和第五可变衰减器；所述垂直腔表面发射激光器后还设置有第二光隔离器和第二偏振分束器。
其中，所述第一光隔离器设置于采样光栅分布布拉格反射激光器和第一光分束器之间，采样光栅分布布拉格反射激光器通过第一光隔离器向第一光分束器传输产生的激光。
所述第一光分束器的一路输出端传输激光至第二光分束器；第一光分束器的另一路输出端通过第三可变衰减器传输激光至第五光分束器；
所述第二光分束器的一路输出端通过第二可变衰减器传输激光至第四光分束器，第二光分束器的另一路输出端通过第一可变衰减器传输激光至第三光分束器；
所述第三光分束器的一路输出端传输激光至第二光电转换器，第二光电转换器的输出端依次通过第二低通滤波器、第二电放大器与电子数据选择器连接；第三光分束器的另一路输出端传输激光至第一光耦合器；
所述第四光分束器的一路输出端传输激光至第一光电转换器，第一光电转换器的输出端依次通过第一低通滤波器、第一电放大器与电子数据选择器连接；第四光分束器的另一路输出端传输激光至第一光耦合器；
所述第五光分束器的一路输出端传输激光至第三光电转换器，第三光电转换器的输出端依次通过第三低通滤波器、第三电放大器与电子数据选择器连接；第五光分束器的另一路输出端传输激光至第一光耦合器；
所述电子数据选择器的输出端与采样光栅分布布拉格反射激光器连接。
所述第一光耦合器的输出端传输激光至第一偏振分束器，第一偏振分束器的一路输出端传输激光至第二光耦合器；第一偏振分束器的另一类输出端经第一法拉第旋转器和第一半波片传输激光至第二光耦合器。
所述第二光耦合器的输出端向第六光分束器传输激光，第六光分束器的一路输出端经第四可变衰减器向垂直腔表面发射激光器传输激光；第六分束器的另一路输出端经第二法拉第旋转器、第二半波片、第五可变衰减器向垂直腔表面发射激光器传输激光。
所述垂直腔表面发射激光器的输出端通过第二光隔离器向第二偏振分束器传输激光，由第二偏振分束器进行偏振输出。
本发明的有益效果是：本发明通过控制选择通道信号的输入能够实现双通道数字混沌信号的选择输出，完成对于并行全光数字混沌信号的数据选择功能，可推广应用到全光混沌触发器、全光混沌计数器中。
附图说明
图1为本发明的结构示意图；
图2为并行全光数字混沌数据选择器的混沌地理图；
图3为在频率失谐为-40GHz和40GHz情况下，两偏振分量的双稳态随E inj的演变图；
图4为采样光栅分布布拉格反射激光器11和垂直腔表面发射激光器14之间的频率失谐与注入光场振幅之间的关系；
图5为并行全光数字混沌数据选择器的输入信号与逻辑控制信号之间的关系；
图6为并行全光数字混沌数据选择器x偏振输出振幅及经阈值判断后输出的数字信号Y 1；
图7为并行全光数字混沌数据选择器y偏振输出振幅及经阈值判断后输出的数字信号Y 2；
图中，1-第一电放大器，2-第一低通滤波器，3-第一光电转换器，4-第二电放大器，5-第二低通滤波器，6-第二光电转换器，7-第三电放大器，8-第三低通滤波器，9-第三光电转换器，10-电子数据选择器，11-采样光栅分布布拉格反射激光器，12-第一光耦合器，13-第二光耦合器，14-垂直腔表面发射激光器，15-第一光隔离器，16-第一光分束器，17-第二光分束器，18-第一可变衰减器，19-第二可变衰减器，20-第三可变衰减器，21-第三光分束器，22-第四光分束器，23-第五光分束器，24-第一偏振分束器，25-第一法拉第旋转器，26-第一半波片，27-第六光分束器，28-第四可变衰减器，29-第二法拉第旋转器，30-第二半波片，31-第五可变衰减器，32-第二光隔离器，33-第二偏振分束器。
具体实施方式
下面结合附图进一步详细描述本发明的技术方案，但本发明的保护范围不局限于以下所述。
如图1所示，一种并行全光数字混沌数据选择器，包括第一电放大器1、第一低通滤波器2、第一光电转换器3、第二电放大器4、第二低通滤波器5、第二光电转换器6、第三电放大器7、第三低通滤波器8、第三光电转换器9、电子数据选择器10、采样光栅分布布拉格反射激光器11、第一光耦合器12、第二光耦合器13、垂直腔表面发射激光器14；
所述的采样光栅分布布拉格反射激光器11与第一光耦合器12之间设置有第一光隔离器15、第一光分束器16、第二光分束器17、第一可变衰减器18、第二可变衰减器19、第三可变衰减器20、第三光分束器21、第四光分束器22、第五光分束器23；所述第一光耦合器12与第二光耦合器13之间有第一偏振分束器24、第一法拉第旋转器25和第一半波片26；所述第二光耦合器13与垂直腔表面发射激光器14之间有第六光分束器27、第四可变衰减器28、第二法拉第旋转器29、第二半波片30和第五可变衰减器31；所述垂直腔表面发射激光器14后还设置有第二光隔离器32和第二偏振分束器33。
其中，所述第一光隔离器15设置于采样光栅分布布拉格反射激光器11和第一光分束器16之间，采样光栅分布布拉格反射激光器11通过第一光隔离器15向第一光分束器16传输产生的激光。
所述第一光分束器16的一路输出端传输激光至第二光分束器17；第一光分束器16的另 一路输出端通过第三可变衰减器20传输激光至第五光分束器23；
所述第二光分束器17的一路输出端通过第二可变衰减器19传输激光至第四光分束器22，第二光分束器17的另一路输出端通过第一可变衰减器18传输激光至第三光分束器21；
所述第三光分束器21的一路输出端传输激光至第二光电转换器6，第二光电转换器6的输出端依次通过第二低通滤波器5、第二电放大器4与电子数据选择器10连接；第三光分束器21的另一路输出端传输激光至第一光耦合器12；
所述第四光分束器22的一路输出端传输激光至第一光电转换器3，第一光电转换器3的输出端依次通过第一低通滤波器2、第一电放大器1与电子数据选择器10连接；第四光分束器22的另一路输出端传输激光至第一光耦合器12；
所述第五光分束器23的一路输出端传输激光至第三光电转换器9，第三光电转换器9的输出端依次通过第三低通滤波器8、第三电放大器7与电子数据选择器10连接；第五光分束器23的另一路输出端传输激光至第一光耦合器12；
所述电子数据选择器10的输出端与采样光栅分布布拉格反射激光器11连接。
所述第一光耦合器12的输出端传输激光至第一偏振分束器24，第一偏振分束器24的一路输出端传输激光至第二光耦合器13；第一偏振分束器24的另一类输出端经第一法拉第旋转器25和第一半波片26传输激光至第二光耦合器13。
所述第二光耦合器的输出端向第六光分束器27传输激光，第六光分束器27的一路输出端经第四可变衰减器28向垂直腔表面发射激光器14传输激光；第六分束器27的另一路输出端经第二法拉第旋转器29、第二半波片30、第五可变衰减器31向垂直腔表面发射激光器14传输激光。
所述垂直腔表面发射激光器14的输出端通过第二光隔离器32向第二偏振分束器33传输激光，由第二偏振分束器33进行偏振输出。
本发明的工作原理如下：采样光栅分布布拉格反射激光器11，作为可调谐激光器，在不同偏振电流作用下产生不同的中心频率的光。第一光隔离器15用来避免第一光分束器16产生光反馈，第二光隔离器32用来避免第二偏振分束器33产生光反馈。第一光分束器16将来自采样光栅分布布拉格反射激光器11的外部光分离成两束光。其中一束经第三可变衰减器20改变光强后注入第五光分束器23；另外一束光经过第二光分束器17又一次被分离为两束光，这两束光再分别通过第一可变衰减器18与第二可变衰减器19改变光强后分别注入第三光分束器21和第四光分束器22。从第四光分束器22和第三光分束器21分离出的两束光被分别编译成两个逻辑输入I 1和I 2；经第五光分束器23分离出的一束光被编译成时钟信号I c。第一光耦合器12将代表信号I 1、I 2和I c的三束光耦合成一束光。为了确保来自第一光耦合器 12输出的任意偏振光能够精确地平行注入到垂直腔表面发射激光器14的每一个偏振分量中，需要通过一些无源器件对这束任意偏振光转换为线性偏振光。即，第一光耦合器12输出的光经第一偏振分束器24分成x偏振光和y偏振光，其中x偏振光直接注入到第二光耦合器13中，y偏振光经过第一法拉第旋转器25和第一半波片26转换为x偏振光后再注入到第二光耦合器13中。第二光耦合器13将上述两束光耦合为一束光且此时信号光为x偏振光。第六光分束器27将来自第二光耦合器13的x偏振光分离为两束光，其中一束经第四可变衰减器28改变光强后直接注入到垂直腔表面发射激光器14的x偏振分量中，另外一束光经第二法拉第旋转器29和第二半波片30转换为y偏振光，再经第五可变衰减器31改变光强后注入垂直腔表面发射激光器14的y偏振分量中。这里垂直腔表面发射激光器14的输出经第二偏振分束器33分为两个混沌偏振分量，这两个混沌偏振输出被编译为并行全光数字混沌数据选择器的两个逻辑输出Y 1和Y 2。
为了实现对光信号的数据选择功能，这里，将采样光栅分布布拉格反射激光器11和垂直腔表面发射激光器14之间的频率失谐Δω(Δω 1+Δω 2)作为控制逻辑信号C，其中Δω 1和Δω 2分别在采样光栅分布布拉格反射激光器11的注入电流为μ 01和μ 02的情况下产生。当
Figure PCTCN2019072303-appb-000001
时，可以获得
Figure PCTCN2019072303-appb-000002
和
Figure PCTCN2019072303-appb-000003
即系统可以产生两个并行的数据选择操作。对于C与I 1，I 2和I c的数据选择关系的具体控制方案如下：经第四光分束器22、第三光分束器21和第五光分束器23分离出的另外三束光分别经过第一光电转换器3、第二光电转换器6和第三光电转换器9转化成电流信号i 1，i 2和i c，它们再分别经过第一低通滤波器2、第二低通滤波器5和第三低通滤波器8进行滤波，滤波后的三个信号再经过第一电放大器1、第二电放大器4和第三电放大器7放大作用后被分别编译为电子数据选择器10的逻辑输入i i1,i i2和i ic。采样光栅分布布拉格反射激光器11的偏置电流μ 0被编译为电子数据选择器10的逻辑输出Y 0，即假如μ 0＝μ 01则Y 01＝0，相应的Δω＝Δω 1(C＝C 1)；当μ 0＝μ 02时，Y 02＝1，对应的Δω＝Δω 2(C＝C 2)。通过使用电子数据选择器10，可以得到
Figure PCTCN2019072303-appb-000004
由此可间接实现
Figure PCTCN2019072303-appb-000005
基于自旋反转模型，外部光注入垂直腔表面发射激光器14的速率方程组可用下列方程表述：
Figure PCTCN2019072303-appb-000006
Figure PCTCN2019072303-appb-000007
Figure PCTCN2019072303-appb-000008
Figure PCTCN2019072303-appb-000009
式中，下角标x和y分别表示x偏振分量和y偏振分量；
Figure PCTCN2019072303-appb-000010
为归一化振幅，g为差分材料增益，A为慢变振幅；N为总载流子浓度；n为上下载流子浓度差；k为场衰减速率；a为线宽增益因子；γ p为双折射系数；γ a为二向色性系数；γ e为非辐射载流子弛豫率；γ s为自旋弛豫率；μ＝(Γg/k)[U/(2eVγ e)-N 0](其中μ为归一化偏置电流)，Γ为有源区的场限制因子，U为注入电流，e为电子电荷，V为有源层体积，N 0为透明载流子浓度的一半；K x为x偏振注入强度系数；K y为y偏振注入强度系数；
Figure PCTCN2019072303-appb-000011
为噪声强度，β sp为自发辐射因子；比特持续时间为T且其等于10ns；
Figure PCTCN2019072303-appb-000012
它是E i1，E i2，E ic之和，A inj为注入场的慢变振幅；ξ x和ξ y为相互独立的高斯白噪声，其均值为0方差为1，相关系数为<ξ i(t)ξ j(t) *>＝2δ ijδ(t-t′)。Δω＝ω inj-ω ref为注入光场与VCSEL的频率失谐，ω inj为注入光场角频率，ω ref为参考角频率，定义为(ω x+ω y)/2，这里ω x＝(-γ p+aγ a)和ω y＝(γ p-aγ a)是垂直腔表面发射激光器14自由运行下的x、y偏振光的角频率。
图2给出了并行全光数字混沌数据选择器的混沌地理图，这里，CO表示系统处于混沌态；QP表示准周期振荡；P 2表示双周期振荡；P 1表示单周期振荡。在Δω＝40GHz条件下，当E inj介于0.59-0.74，输出的x-PC处于混沌状态，当E inj在0.57-2.18之间变化时，输出的输出y-PC呈现混沌状态。假如Δω＝-40GHz，E inj在0.1-3变化时，输出x-PC与y-PC都位于混沌状态。为了确定用来编译成逻辑输入的E inj值，我们计算了在Δω＝40和-40GHz情况下，两个输出偏振分量的双稳态随E inj的动态演变。如图3所示，当Δω＝40GHz时，x-PC与y-PC的双稳环位于E inj介于0.37-0.73之间的范围内，在这个范围内的E inj使系统产生混沌输出。
对于并行全光数字混沌数据选择器逻辑输入的编译我们采用如下方案：假设E inj等于并行全光数字混沌数据选择器输入的三个方波之和，即E inj＝E i1+E i2+E ic。这里，E i1，E i2和E ic依次用来编译成逻辑数字输入信号I 1，I 2和数据选择信号I c。由于逻辑输入可能是0或1，所以(I 1,I 2,I c)存在8个逻辑序列，即(0，0，0)、(0，0，1)、(0，1，0)、(0，1，1)、(1，0，0)、(1，0，1)、(1，1，0)、(1，1，1)。我们用四个标准信号来编译成这8个逻辑输入，这 里，E inj1(E inj2-ΔE inj)表示(0，0，0)；E inj2表示(0，0，1)、(0，1，0)和(1，0，0)；E inj3(E inj2+ΔE inj)表示(0，1，1)，(1，0，1)和(1，1，0)；E inj4(E inj2+2ΔE inj)代表(1，1，1)。四标准信号在一个周期T内是常数，这里T设为10ns，即逻辑器件的速率为0.1GHz。我们取E inj1＝0.63，E inj2＝0.66，E inj3＝0.69和E inj4＝0.72作为四标准信号。这里，当E i1＝E i2＝E ic＝0.21时，I 1＝I 2＝I c＝0；假如E i1＝E i2＝E ic＝0.24时，I 1＝I 2＝I c＝1。另外，若Δω＝40GHz，C＝1；当Δω＝-40GHz时，C＝0。
对于并行全光数字混沌数据选择器的输出，这里采用阈值机制来获得。假定垂直腔表面发射激光器x偏振分量输出的光强E x的均方差(MSEs)为σ x，y偏振分量输出的光强E y的MSEs为σ y，考虑逻辑输出Y 1和Y 2都有相同的阈值M，且其为0.1。于是，当E x或E y的最小均方差σ x min>M和σ y min>M时Y 1＝1和Y 2＝1，反之其最大均方差σ x max<M和σ y max<M时Y 1＝0和Y 2＝0。根据上述逻辑输入和输出编译原理，我们给出了全光混沌逻辑选择运算的实现，如图4所示，这里注入光场的振幅随快速的四标准信号的变化。表1给出了逻辑输入，选择信号和逻辑输出的组合排列。如图4所示，通过电数据选择器控制采样光栅分布布拉格反射激光器偏置电流与反馈电流i 1，i 2和i C的数据逻辑选择运算，间接获得了Δω与E i1，E i2和E ic数据选择运算逻辑关系。在此基础上，当(I 1，I 2,I C)＝(0，0，0)，(0，0，1)，(0，1，0)和(1，0，1)时，σ x max分别为0.0262,0.0322，0.0308和0.0281，σ y max分别为0.0751，0.0712，0.0806和0.0376。由于σ x max<M和σ y max<M,Y 1＝0和Y 2＝0；当(I 1，I 2,I C)＝(1，0，0)，(1，1，0)，(0，1，1)和(1，1，1)时，σ x min分别为0.1290,0.1409,0.1371和0.1567，σ y min分别为0.1292,0.1510,0.1497和0.1693。由于σ x min>M和σ y min>M,Y 1＝1和Y 2＝1。于是，我们获得了两个并行全光混沌数据选择运算如下：
Figure PCTCN2019072303-appb-000013
和
Figure PCTCN2019072303-appb-000014
如下表所示。
Figure PCTCN2019072303-appb-000015
Figure PCTCN2019072303-appb-000016
图2给出了并行全光数字混沌数据选择器的混沌地理图。其中图2(a)为系统的x-PC输出，图2(b)为y-PC输出。这里，CO:混沌态；QP:准周期振荡；P 2：双周期振荡；P 1：单周期振荡；
图3为在Δω＝-40GHz(a)和40GHz(b)情况下，两偏振分量的双稳态随E inj的演变。这里，
Figure PCTCN2019072303-appb-000017
实线代表x-PC输出情况；虚线表示y-PC输出情况。箭头表示用来编译逻辑输入的四标准信号所在位置；
图4给出了采样光栅分布布拉格反射激光器11和垂直腔表面发射激光器14之间的频率失谐与注入光场振幅之间的关系。虚线：采样光栅分布布拉格反射激光器11和垂直腔表面发射激光器14之间的频率失谐。实线：注入光场振幅。
图5给出了并行全光数字混沌数据选择器输入的信号I 1、I 2和I c与逻辑控制信号C之间的关系。
图6给出了并行全光数字混沌数据选择器的x偏振输出情况。实线：垂直腔表面发射激光器14发出的x偏振光的振幅E x(t)。虚线：经阈值判断后输出的数字信号Y 1(t)。
图7给出了并行全光数字混沌数据选择器的y偏振输出情况。实线：垂直腔表面发射激光器14发出的y偏振光的振幅E y(t)。虚线：经阈值判断后输出的数字信号Y 2(t)。
最后需要说明的是，以上所述是本发明的优选实施方式，应当理解本发明并非局限于本文所披露的形式，不应该看作是对其他实施例的排除，而可用于其他组合、修改和环境，并能够在本文所述构想范围内，通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。

Claims (6)

  1. 一种并行全光数字混沌数据选择器，其特征在于：包括第一电放大器(1)、第一低通滤波器(2)、第一光电转换器(3)、第二电放大器(4)、第二低通滤波器(5)、第二光电转换器(6)、第三电放大器(7)、第三低通滤波器(8)、第三光电转换器(9)、电子数据选择器(10)、采样光栅分布布拉格反射激光器(11)、第一光耦合器(12)、第二光耦合器(13)、垂直腔表面发射激光器(14)；
    所述的采样光栅分布布拉格反射激光器(11)与第一光耦合器(12)之间设置有第一光隔离器(15)、第一光分束器(16)、第二光分束器(17)、第一可变衰减器(18)、第二可变衰减器(19)、第三可变衰减器(20)、第三光分束器(21)、第四光分束器(22)、第五光分束器(23)；所述第一光耦合器(12)与第二光耦合器(13)之间有第一偏振分束器(24)、第一法拉第旋转器(25)和第一半波片(26)；所述第二光耦合器(13)与垂直腔表面发射激光器(14)之间有第六光分束器(27)、第四可变衰减器(28)、第二法拉第旋转器(29)、第二半波片(30)和第五可变衰减器(31)；所述垂直腔表面发射激光器(14)后还设置有第二光隔离器(32)和第二偏振分束器(33)。
  2. 根据权利要求1所述的一种并行全光数字混沌数据选择器，其特征在于：所述第一光隔离器(15)设置于采样光栅分布布拉格反射激光器(11)和第一光分束器(16)之间，采样光栅分布布拉格反射激光器(11)通过第一光隔离器(15)向第一光分束器(16)传输产生的激光。
  3. 根据权利要求2所述的一种并行全光数字混沌数据选择器，其特征在于：所述第一光分束器(16)的一路输出端传输激光至第二光分束器(17)；第一光分束器(16)的另一路输出端通过第三可变衰减器(20)传输激光至第五光分束器(23)；
    所述第二光分束器(17)的一路输出端通过第二可变衰减器(19)传输激光至第四光分束器(22)，第二光分束器(17)的另一路输出端通过第一可变衰减器(18)传输激光至第三光分束器(21)；
    所述第三光分束器(21)的一路输出端传输激光至第二光电转换器(6)，第二光电转换器(6)的输出端依次通过第二低通滤波器(5)、第二电放大器(4)与电子数据选择器(10)连接；第三光分束器(21)的另一路输出端传输激光至第一光耦合器(12)；
    所述第四光分束器(22)的一路输出端传输激光至第一光电转换器(3)，第一光电转换器(3)的输出端依次通过第一低通滤波器(2)、第一电放大器(1)与电子数据选择器(10)连接；第四光分束器(22)的另一路输出端传输激光至第一光耦合器(12)；
    所述第五光分束器(23)的一路输出端传输激光至第三光电转换器(9)，第三光电转换器(9)的输出端依次通过第三低通滤波器(8)、第三电放大器(7)与电子数据选择器(10) 连接；第五光分束器(23)的另一路输出端传输激光至第一光耦合器(12)；
    所述电子数据选择器(10)的输出端与采样光栅分布布拉格反射激光器(11)连接。
  4. 根据权利要求1所述的一种并行全光数字混沌数据选择器，其特征在于：所述第一光耦合器(12)的输出端传输激光至第一偏振分束器(24)，第一偏振分束器(24)的一路输出端传输激光至第二光耦合器(13)；第一偏振分束器(24)的另一类输出端经第一法拉第旋转器(25)和第一半波片(26)传输激光至第二光耦合器(13)。
  5. 根据权利要求1所述的一种并行全光数字混沌数据选择器，其特征在于：所述第二光耦合器的输出端向第六光分束器(27)传输激光，第六光分束器(27)的一路输出端经第四可变衰减器(28)向垂直腔表面发射激光器(14)传输激光；第六分束器(27)的另一路输出端经第二法拉第旋转器(29)、第二半波片(30)、第五可变衰减器(31)向垂直腔表面发射激光器(14)传输激光。
  6. 根据权利要求1所述的一种并行全光数字混沌数据选择器，其特征在于：所述垂直腔表面发射激光器(14)的输出端通过第二光隔离器(32)向第二偏振分束器(33)传输激光，由第二偏振分束器(33)进行偏振输出。
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