CN108710248B - Time-Domain Stealth System Based on Time-Domain Taber Effect - Google Patents

Time-Domain Stealth System Based on Time-Domain Taber Effect Download PDF

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CN108710248B
CN108710248B CN201810829418.1A CN201810829418A CN108710248B CN 108710248 B CN108710248 B CN 108710248B CN 201810829418 A CN201810829418 A CN 201810829418A CN 108710248 B CN108710248 B CN 108710248B
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李明
林志星
孙术乾
祝宁华
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Abstract

本发明公开了一种基于时域泰伯效应的时域隐身系统，属于光通信技术领域。该时域隐身系统包括：信号发生器件，用于产生光脉冲并调制上信号；隐身器件，用于引入符合

Figure DDA0001743203600000011
的色散值实现时域隐身。本发明将时域泰伯效应的时域平均效应引入到时域隐身的概念上，将被调制上强度信息的脉冲序列的能量进行重新分布，使其在一定时间范围内得到平均，这样得到的输出光将于光源的输出光看起来一致，这样就实现了时域隐身的效果。

Figure 201810829418

The invention discloses a time-domain stealth system based on the time-domain Taber effect, belonging to the technical field of optical communication. The time-domain stealth system includes: a signal generating device for generating optical pulses and modulating the upper signal; a stealth device for introducing conformance

Figure DDA0001743203600000011
The dispersion value of , realizes time-domain stealth. The invention introduces the time-domain averaging effect of the time-domain Taber effect into the concept of time-domain stealth, and redistributes the energy of the pulse sequence modulated with intensity information so that it can be averaged within a certain time range. The output light will look the same as the output light of the light source, thus achieving the effect of temporal stealth.

Figure 201810829418

Description

基于时域泰伯效应的时域隐身系统Time-Domain Stealth System Based on Time-Domain Taber Effect

技术领域technical field

本发明涉及光通信技术领域，特别涉及一种基于时域泰伯效应的时域隐身系统。The invention relates to the technical field of optical communication, in particular to a time-domain stealth system based on the time-domain Taber effect.

背景技术Background technique

隐身，这个在过去被认为不可能存在于真实世界中的技术，通过学者们的努力，已经成功的实现了空域或者时域上的隐身。空域上的隐身主要是在材料上做文章，即通过改变材料的折射率等来实现隐身。而随着隐身衣在空域上的大热，时域隐身的概念也被提出来。Stealth, a technology that was considered impossible to exist in the real world in the past, has successfully achieved stealth in airspace or time domain through the efforts of scholars. Stealth in airspace is mainly made of materials, that is, by changing the refractive index of materials, etc. to achieve stealth. With the popularity of invisibility cloaks in the airspace, the concept of time-domain stealth has also been proposed.

时域隐身是指经过强度调制或者其他的调制方式携带了信号的光，经过时域隐身系统之后，将会被还原和未经过调制的光一样，就像调制上的信号被隐身了一样。时域隐身最先与2010年由康奈尔大学的Alexander L.Gaeta研究组实现，其利用了非线性效应来产生模拟时间透镜，产生了时间间隙，将信号调制在时间带隙上，从而实现了信号的隐身。而在2013年，普渡大学的Andrew M.Weiner研究组利用相位调制器，产生边带，通过色散光纤将不同的边带在时域上分开，产生了时间带隙，同样将信号调制在时间带隙上，从而实现了信号的隐身。Time-domain stealth refers to light that carries a signal through intensity modulation or other modulation methods. After passing through the time-domain stealth system, it will be restored to the same unmodulated light, just as the modulated signal has been stealthed. Time-domain stealth was first realized in 2010 by the research group of Alexander L. Gaeta of Cornell University, which uses nonlinear effects to generate an analog time lens, generates a time gap, and modulates the signal on the time band gap to achieve signal stealth. In 2013, the research group of Andrew M. Weiner of Purdue University used a phase modulator to generate sidebands, and separated different sidebands in the time domain through dispersive fibers, resulting in a time band gap, which also modulated the signal in time. On the band gap, thus realizing the stealth of the signal.

泰伯效应，最早于1731年由泰伯发现，是指一束平面光经过一个周期性光栅后，在其传播方向上，不同的传播距离上，周期性光栅的图案会以复现出来。后来，学者发现，空域的衍射和时域上的色散的数学表达是一致的，人们便得到了时空二重性，许多空间上的概念，例如时间透镜、泰伯效应等被引入到了时域上。The Taber effect, first discovered by Taber in 1731, means that after a beam of plane light passes through a periodic grating, the pattern of the periodic grating will reproduce in its propagation direction and at different propagation distances. Later, scholars found that the mathematical expressions of diffraction in the space domain and dispersion in the time domain were consistent, and people obtained the duality of space and time. Many spatial concepts, such as time lensing and the Taber effect, were introduced into the time domain.

发明内容SUMMARY OF THE INVENTION

(一)要解决的技术问题(1) Technical problems to be solved

有鉴于此，本发明的目的在于提供一种基于时域泰伯效应的时域隐身系统，以解决利用泰伯效应实现时域隐身问题。In view of this, the purpose of the present invention is to provide a time-domain stealth system based on the time-domain Taber effect, so as to solve the problem of realizing the time-domain stealth by using the Taber effect.

(二)技术方案(2) Technical solutions

根据本发明的一方面，提供一种基于时域泰伯效应的时域隐身系统，包括：According to an aspect of the present invention, a time-domain stealth system based on the time-domain Taber effect is provided, comprising:

信号发生器件，用于产生光脉冲并调制上信号；A signal generating device for generating optical pulses and modulating signals;

隐身器件，用于引入符合

Figure BDA0001743203580000021
的色散值以实现时域隐身，其中，s为自然数，T为重复周期，β为二阶色散系数，L为色散介质长度。Stealth device for introducing compliance with
Figure BDA0001743203580000021
The dispersion value of is to achieve time-domain stealth, where s is a natural number, T is the repetition period, β is the second-order dispersion coefficient, and L is the length of the dispersion medium.

在进一步的实施方案中，所述的信号发生器件包括：In a further embodiment, the signal generating device comprises:

模拟信号发生器，用于提供时钟信号；An analog signal generator for providing a clock signal;

主动锁模激光器，与模拟信号发生器连接，用于输出相位恒定的光脉冲，且光谱为梳状；An active mode-locked laser, connected with an analog signal generator, for outputting light pulses with a constant phase and a comb-like spectrum;

带通光滤波器，与主动锁模激光器连接，用于将光谱范围缩小；Bandpass optical filter, in connection with active mode-locked laser, for narrowing down the spectral range;

偏振控制器，与带通光滤波器连接，用于控制光的偏振；a polarization controller, connected with a bandpass optical filter, for controlling the polarization of light;

事件发生装置，用于产生被隐身的事件；an event generating device for generating a cloaked event;

电放大器，与事件发生装置连接，用于将事件信号放大；An electric amplifier, connected with the event generating device, for amplifying the event signal;

可调延时线，与偏振控制器连接，用于将被调制信号与脉冲对准；An adjustable delay line, connected to the polarization controller, for aligning the modulated signal with the pulse;

强度调制器，与可调延时线连接，用于将光脉冲调制上信号。The intensity modulator, connected with the adjustable delay line, is used to modulate the light pulse onto the signal.

在进一步的实施方案中，所述的隐身器件包括：In a further embodiment, the stealth device includes:

掺铒光纤放大器，用于将光信号进行放大；Erbium-doped fiber amplifier for amplifying optical signals;

色散器件，与掺铒光纤放大器连接，用于引入符合

Figure BDA0001743203580000022
的色散值；Dispersive devices, connected to erbium-doped fiber amplifiers, for introducing conformance
Figure BDA0001743203580000022
The dispersion value of ;

光电探测器，与色散器件连接，用于探测系统输出的波形。The photodetector, connected with the dispersive device, is used to detect the waveform output by the system.

在进一步的实施方案中，所述的被调制的光脉冲的消光比为0.5-0.9。In a further embodiment, the modulated optical pulse has an extinction ratio of 0.5-0.9.

在进一步的实施方案中，所述的调制的信号为周期性或非周期性信号。In further embodiments, the modulated signal is a periodic or aperiodic signal.

在进一步的实施方案中，所述的光脉冲序列的重复频率为1—43G Hz。In a further embodiment, the repetition frequency of the optical pulse sequence is 1-43 GHz.

在进一步的实施方案中，所述的色散器件为色散光纤。In further embodiments, the dispersive device is a dispersive fiber.

(三)有益效果(3) Beneficial effects

本发明的基于时域泰伯效应的时域隐身系统，将被调制上强度信息的脉冲序列的能量进行重新分布，使其在一定时间范围内得到平均，这样得到的输出光将于光源的输出光看起来一致，从而实现了良好时域隐身的效果。The time-domain stealth system based on the time-domain Taber effect of the present invention redistributes the energy of the pulse sequence modulated with intensity information, so that it can be averaged within a certain time range, and the output light obtained in this way will be equal to the output of the light source. The light appears consistent, resulting in the effect of good temporal stealth.

附图说明Description of drawings

图1是本发明实施例的系统框图；1 is a system block diagram of an embodiment of the present invention;

图2是本发明实施例中主动锁模激光器的输出光脉冲的时域波形；Fig. 2 is the time domain waveform of the output optical pulse of the active mode-locked laser in the embodiment of the present invention;

图3是本发明实施例中脉冲经过强度调制器之后携带了周期性信号的时域波形；Fig. 3 is the time domain waveform of the periodic signal after the pulse passes through the intensity modulator in the embodiment of the present invention;

图4是本发明实施例中脉冲经过了隐身之后的光脉冲；Fig. 4 is the light pulse after the pulse passes through stealth in the embodiment of the present invention;

图5是本发明实施例中脉冲调制上长度为231-1的伪随机信号后得到的时域波形；Fig. 5 is the time domain waveform obtained after the pulse modulates the pseudo-random signal with the length of 2 31 -1 in the embodiment of the present invention;

图6是本发明实施例中经过了时域隐身系统之后得到的时域波形。FIG. 6 is a time-domain waveform obtained after passing through a time-domain stealth system in an embodiment of the present invention.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚明白，以下结合具体实施例，并参照附图，对本发明进一步详细说明。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

时域上的泰伯效应是指在相位上相同或相差2π的整数倍的脉冲序列经过特定色散值的传播介质之后，会在特定的位置上重复周期和幅值会按照不同的倍数复现出脉冲序列。这是因为脉冲序列的光谱是梳状的，且每根谱线之间的间隔为脉冲的重复频率，并且每个脉冲含有的光谱成分都是一样的，所以脉冲在经过一阶散射介质之后，每个脉冲的谱线被按照与中心波长的不同差值被不同的延迟。当一阶色散值满足特定的条件，也就是所提供的色散量足以将每个脉冲中的不同的谱线延迟到一定的时间间隔上相长，此时便有了泰伯效应，整数倍的泰伯效应需满足：

Figure BDA0001743203580000031
其中s为自然数，T为重复周期，β为二阶色散系数，L为色散介质长度。若满足上述条件，则脉冲串在经历一定的色散介质的传播之后，每个脉冲的串的不同的分量会平均的分配到周围时刻的脉冲上，这就是时域泰伯效应的平均作用，也正是我们实现时域隐身的基础。将时域泰伯效应的时域平均效应引入到时域隐身的概念上，将被调制上强度信息的脉冲序列的能量进行重新分布，使其在一定时间范围内得到平均，这样得到的输出光将与光源的输出光看起来一致，这样就实现了时域隐身的效果。The Taber effect in the time domain means that the pulse sequence with the same phase or an integer multiple of 2π different in phase passes through the propagation medium of a specific dispersion value, and the cycle and amplitude will be repeated at a specific position and reproduced according to different multiples. pulse train. This is because the spectrum of the pulse sequence is comb-shaped, and the interval between each spectral line is the repetition frequency of the pulse, and each pulse contains the same spectral components, so after the pulse passes through the first-order scattering medium, The spectral lines of each pulse are delayed differently by different differences from the center wavelength. When the first-order dispersion value satisfies a specific condition, that is, the amount of dispersion provided is sufficient to delay the different spectral lines in each pulse to a certain time interval constructively, then there is the Taber effect, an integer multiple of The Taber effect needs to satisfy:
Figure BDA0001743203580000031
Where s is a natural number, T is the repetition period, β is the second-order dispersion coefficient, and L is the length of the dispersion medium. If the above conditions are met, after the pulse train undergoes the propagation of a certain dispersive medium, the different components of each pulse train will be evenly distributed to the pulses at the surrounding moments, which is the averaging effect of the time-domain Taber effect. It is the basis for our realization of temporal stealth. The time-domain averaging effect of the time-domain Taber effect is introduced into the concept of time-domain stealth, and the energy of the pulse sequence modulated with intensity information is redistributed so that it can be averaged within a certain time range, and the output light obtained in this way is It will look consistent with the output light of the light source, thus achieving the effect of temporal stealth.

本发明提供一种基于时域泰伯效应的时域隐身系统(如图1所示)，该时域隐身系统包括：信号发生器件和隐身器件。其中，信号发生器件包括：The present invention provides a time-domain stealth system based on the time-domain Taber effect (as shown in FIG. 1 ). The time-domain stealth system includes: a signal generating device and a stealth device. Among them, the signal generating device includes:

模拟信号发生器1，用于提供时钟信号，同时这也是脉冲的重复频率；Analog signal generator 1, used to provide a clock signal, which is also the repetition frequency of the pulse;

主动锁模激光器2，与模拟信号发生器1连接，用于输出相位恒定的光脉冲，且光谱为梳状；光脉冲序列的重复频率可以为1—43GHzThe active mode-locked laser 2 is connected to the analog signal generator 1, and is used to output optical pulses with a constant phase, and the spectrum is comb-shaped; the repetition frequency of the optical pulse sequence can be 1-43 GHz

带通光滤波器3，与主动锁模激光器2连接，用于用于将光谱范围缩小以达到可将色散光纤的色散系数视为常数；The bandpass optical filter 3 is connected with the active mode-locked laser 2, and is used for narrowing the spectral range so that the dispersion coefficient of the dispersive fiber can be regarded as a constant;

偏振控制器6，与带通光滤波器3连接，用于控制光的偏振，使其功率稳定；The polarization controller 6 is connected with the bandpass optical filter 3, and is used for controlling the polarization of the light to stabilize its power;

事件发生装置4，用于产生被隐身的事件；an event generating device 4 for generating a concealed event;

电放大器5，与事件发生装置4连接，用于将事件信号放大至所要求的调制深度的功率；An electric amplifier 5, connected with the event generating device 4, is used for amplifying the event signal to the power of the required modulation depth;

可调延时线7，与偏振控制器6连接，用于将被调制信号与脉冲对准；Adjustable delay line 7, connected with polarization controller 6, for aligning the modulated signal with the pulse;

强度调制器8，与可调延时线7连接，用于将光脉冲调制上信号。从激光器输出的光脉冲被强度调制器调制之后，光脉冲序列就携带了信息。锁模激光器出射的载波经过调制之后，依然为与激光器输出的光谱一样的梳状的。强度调制的消光比应该在0.5到0.9之间。The intensity modulator 8 is connected to the adjustable delay line 7, and is used for modulating the light pulse onto a signal. After the optical pulse output from the laser is modulated by the intensity modulator, the optical pulse sequence carries the information. After the carrier wave emitted by the mode-locked laser is modulated, it still has the same comb shape as the spectrum output by the laser. The extinction ratio for intensity modulation should be between 0.5 and 0.9.

隐身器件包括：Stealth devices include:

掺铒光纤放大器9，与强度调制器8连接，用于将光信号进行放大；The erbium-doped fiber amplifier 9 is connected to the intensity modulator 8 for amplifying the optical signal;

色散器件10，与掺铒光纤放大器9连接，用于引入符合

Figure BDA0001743203580000041
的色散值；色散器件10可以是但不局限于色散光纤。与幅值均匀的脉冲序列经过色散介质的过程实现泰伯效应的平均作用一样，当传播的过程经历了特殊的色散值
Figure BDA0001743203580000042
(s＝1,2,3.....)之后，则每个脉冲之中的不同的谱线会被线性的延迟到邻近时刻的脉冲上。所有被延迟到某一时刻的光谱成分右会重组形成新的脉冲，这样的话每一个时刻上的脉冲的能量会被平均的分配到邻近的时刻上，就实现了时域平均效应。借助于时域平均效应，就可以对携带了信息的脉冲序列的隐身。The dispersion device 10 is connected to the erbium-doped fiber amplifier 9 for introducing
Figure BDA0001743203580000041
The dispersion value of ; the dispersion device 10 may be, but is not limited to, a dispersion fiber. Similar to the average effect of the Tiber effect achieved in the process of the uniform amplitude pulse sequence passing through the dispersive medium, when the propagation process experiences a special dispersion value
Figure BDA0001743203580000042
After (s=1, 2, 3...), the different spectral lines in each pulse will be linearly delayed to the pulses at adjacent times. All spectral components delayed to a certain moment will be recombined to form a new pulse, so that the energy of the pulse at each moment will be evenly distributed to the adjacent moments, and the time domain averaging effect will be achieved. By means of the time domain averaging effect, the stealth of the information-carrying pulse sequence can be achieved.

光电探测器11，与色散器件10连接，用于探测系统输出的波形。The photodetector 11, connected to the dispersion device 10, is used for detecting the waveform output by the system.

在本发明的一个实施例中，主动锁模激光器2的输出光脉冲的时域波形如图2所示。从主动锁模激光器2输出之后经过强度调制器8，调制上周期性信号后得到的时域波形如图3所示，可以看到此时消光比大约为0.5，脉冲的重复频率为6.61GHz。隐身器件所引入的色散为2850ps/nm，经过了本文所述的时域隐身技术之后得到的时域波形如图4所示，可以看到周期性信号已经得到了很好的隐身，变得很平坦。因此，本发明可实现周期性的信号的隐身。In an embodiment of the present invention, the time-domain waveform of the output optical pulse of the active mode-locked laser 2 is shown in FIG. 2 . After the output from the active mode-locked laser 2, the intensity modulator 8 modulates the periodic signal, and the time domain waveform obtained is shown in Figure 3. It can be seen that the extinction ratio is about 0.5, and the pulse repetition frequency is 6.61 GHz. The dispersion introduced by the stealth device is 2850ps/nm. The time domain waveform obtained after the time domain stealth technology described in this paper is shown in Figure 4. It can be seen that the periodic signal has been well stealthed and has become very flat. Therefore, the present invention can realize the stealth of periodic signals.

在本发明的一个另一个实施例中，主动锁模激光器2的输出光脉冲的时域波形如图2所示。从主动锁模激光器2输出之后经过强度调制器8，调制上长度为231-1的伪随机信号后得到的时域波形如图5所示，其脉冲的重复频率也为6.61GHz，消光比也在0.5左右。隐身器件所引入的色散为2850ps/nm，经过了本文所述的时域隐身技术之后得到的时域波形如图6所示；。显然，输出的光脉冲已经完全看不到任何的调制信息，调制上的信号得到了很好的隐藏。因此，本发明可实现非周期性的信号的隐身。In another embodiment of the present invention, the time domain waveform of the output optical pulse of the active mode locking laser 2 is shown in FIG. 2 . After the output from the active mode-locked laser 2, the intensity modulator 8 modulates the pseudo-random signal with a length of 2 31 -1, and the time domain waveform obtained is shown in Figure 5. The repetition frequency of the pulse is also 6.61 GHz, and the extinction ratio is Also around 0.5. The dispersion introduced by the stealth device is 2850ps/nm, and the time-domain waveform obtained after the time-domain stealth technology described in this paper is shown in Figure 6; Obviously, the output optical pulse has no modulation information at all, and the modulation signal is well hidden. Therefore, the present invention can realize the stealth of aperiodic signals.

以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1.一种基于时域泰伯效应的时域隐身系统，其特征在于，包括：1. a time-domain stealth system based on time-domain Taber effect, is characterized in that, comprises: 信号发生器件，用于产生光脉冲并调制上信号；A signal generating device for generating optical pulses and modulating signals; 隐身器件，用于引入符合
Figure FDA0002491637740000011
的色散值以实现时域隐身，其中，s为自然数，T为重复周期，β为二阶色散系数，L为色散介质长度；Stealth device for introducing compliance with
Figure FDA0002491637740000011
The dispersion value of is to achieve time-domain stealth, where s is a natural number, T is the repetition period, β is the second-order dispersion coefficient, and L is the length of the dispersion medium; 其中，所述信号发生器件包括：Wherein, the signal generating device includes: 模拟信号发生器(1)，用于提供时钟信号；an analog signal generator (1) for providing a clock signal; 主动锁模激光器(2)，与模拟信号发生器(1)连接，用于输出相位恒定的光脉冲，且光谱为梳状；an active mode-locked laser (2), connected to an analog signal generator (1), for outputting optical pulses with a constant phase and a comb-shaped spectrum; 带通光滤波器(3)，与主动锁模激光器(2)连接，用于将光谱范围缩小；a band-pass optical filter (3), connected to the active mode-locked laser (2), for reducing the spectral range; 偏振控制器(6)，与带通光滤波器(3)连接，用于控制光的偏振；a polarization controller (6), connected to the bandpass optical filter (3), for controlling the polarization of light; 事件发生装置(4)，用于产生被隐身的事件；an event generating device (4) for generating a concealed event; 电放大器(5)，与事件发生装置(4)连接，用于将事件信号放大；an electric amplifier (5), connected with the event generating device (4), for amplifying the event signal; 可调延时线(7)，与偏振控制器(6)连接，用于将被调制信号与脉冲对准；an adjustable delay line (7), connected with the polarization controller (6), for aligning the modulated signal with the pulse; 强度调制器(8)，与可调延时线可调延时线(7)连接，用于将光脉冲调制上信号；The intensity modulator (8) is connected with the adjustable delay line (7) of the adjustable delay line, and is used for modulating the optical pulse to the signal; 所述隐身器件包括：The stealth device includes: 掺铒光纤放大器(9)，用于将光信号进行放大；an erbium-doped fiber amplifier (9) for amplifying the optical signal; 色散器件(10)，与掺铒光纤放大器(9)连接，用于引入符合
Figure FDA0002491637740000012
的色散值，其中，s为自然数，T为重复周期，β为二阶色散系数，L为色散介质长度；A dispersive device (10) connected to an erbium-doped fiber amplifier (9) for introducing
Figure FDA0002491637740000012
The dispersion value of , where s is a natural number, T is the repetition period, β is the second-order dispersion coefficient, and L is the length of the dispersion medium; 光电探测器(11)，与色散器件(10)连接，用于探测系统输出的波形。The photodetector (11) is connected with the dispersion device (10), and is used for detecting the waveform output by the system. 2.根据权利要求1所述的一种基于时域泰伯效应的时域隐身系统，其特征在于，所述被调制的光脉冲的消光比为0.5-0.9。2 . The time-domain stealth system based on the time-domain Taber effect according to claim 1 , wherein the modulated optical pulse has an extinction ratio of 0.5-0.9. 3 . 3.根据权利要求1所述的一种基于时域泰伯效应的时域隐身系统，其特征在于，所述调制的信号为周期性或非周期性信号。3 . The time-domain stealth system based on the time-domain Taber effect according to claim 1 , wherein the modulated signal is a periodic or aperiodic signal. 4 . 4.根据权利要求3所述的一种基于时域泰伯效应的时域隐身系统，其特征在于，所述光脉冲序列的重复频率为1—43GHz。4 . The time-domain stealth system based on the time-domain Taber effect according to claim 3 , wherein the repetition frequency of the optical pulse sequence is 1-43 GHz. 5 . 5.根据权利要求1所述的一种基于时域泰伯效应的时域隐身系统，其特征在于，所述色散器件(10)为色散光纤。5. The time-domain stealth system based on the time-domain Taber effect according to claim 1, wherein the dispersion device (10) is a dispersion fiber.
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