CN106209258A - A kind of optical signal enciphering/deciphering system based on time lens imaging - Google Patents
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Abstract
一种基于时间透镜成像的光信号加/解密系统，包括时间透镜成像子系统；所述时间透镜成像子系统均由输入段光纤、时间透镜和输出段光纤构成，所述输出段光纤的二阶色散量φ″2与输入段光纤的二阶色散量φ″1相反，即φ″2＝‑φ″1；所述时间透镜成像子系统的放大倍数M＝φ″2/φ″1＝‑1；在泵浦光序列流的所有0码时间段内，时间透镜效应不发生，其所涵盖时间段内的信号序列保持不变；在泵浦光序列流的所有1码时间段内，时间透镜效应发生，其所涵盖时间段内的信号序列发生反演。本发明提供了一种有效实现光信号的加密与解密、安全性良好的基于时间透镜成像的光信号加/解密系统。
An optical signal encryption/decryption system based on time lens imaging, including a time lens imaging subsystem; the time lens imaging subsystem is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second order of the output section optical fiber The amount of dispersion φ″ 2 is opposite to the amount of second-order dispersion φ″ 1 of the input fiber, that is, φ″ 2 =-φ″ 1 ; the magnification of the time lens imaging subsystem M=φ″ 2 /φ″ 1 =- 1. In all the 0-yard time periods of the pump light sequence flow, the time lens effect does not occur, and the signal sequence in the time period covered by it remains unchanged; in all the 1-yard time periods of the pump light sequence flow, the time Lensing occurs and the sequence of signals over the time period covered by it is inverted. The invention provides an optical signal encryption/decryption system based on time lens imaging, which effectively realizes encryption and decryption of optical signals and has good security.
Description
技术领域technical field
本发明涉及一种利用时间透镜成像技术构建的光信号加/解密系统。The invention relates to an optical signal encryption/decryption system constructed by using time lens imaging technology.
背景技术Background technique
时间透镜是指能够对光信号产生二次时间相移的一种光器件，光通信领域中的信号处理，首选利用四波混频(FWM)来实现时间透镜效应。电场幅度分别为Es(t)和Ep(t)的信号光与泵浦光发生FWM作用，产生的闲置波电场幅度闲置光Eidler相对于输入的信号光Es而言引入了二次相移，这是FWM产生时间透镜效应的基本原理。Time lens refers to an optical device that can generate a second time phase shift for optical signals. For signal processing in the field of optical communication, the first choice is to use four-wave mixing (FWM) to achieve the time lens effect. The signal light with the electric field amplitudes of E s (t) and E p (t) and the pump light undergo FWM interaction, and the electric field amplitude of the idle wave generated is The idle light E idler introduces a quadratic phase shift relative to the input signal light E s , which is the basic principle of the time lens effect produced by FWM.
由输入段光纤(二阶色散量为φ1″＝β2sLs)、时间透镜(焦距色散为φf″＝-φp″/2＝-β2pLp/2)、输出段光纤(二阶色散量为φ2″＝β2iLi)三部分形成一个时间透镜成像系统。前后两段光纤的色散量分别为φ1″＝β2sLs，φ2″＝β2iLi，时间透镜的焦距色散完全由泵浦光所历经的色散来决定，φf″＝-φp″/2＝-β2pLp/2，β2s、β2i分别为两段光纤的二阶色散系数，β2p是泵浦光传输光纤的二阶色散系数；Ls、Li分别为前后两段光纤的长度，Lp是泵浦光历经色散展宽的光纤的长度。当两段光纤的二阶色散量φ1″、φ2″与时间透镜的焦距色散φf″之间满足成像条件时，就可以实现对输入光信号的放大或压缩，其中放大倍数M＝φ2″/φ1″。It consists of input optical fiber (second order dispersion is φ 1 ″=β 2s L s ), time lens (focus dispersion is φ f ″=-φ p ″/2=-β 2p L p /2), output optical fiber ( The second-order dispersion amount is φ 2 ″=β 2i L i ) and three parts form a temporal lens imaging system. The dispersion of the two sections of fiber before and after are respectively φ 1 ″=β 2s L s , φ 2 ″=β 2i L i , the focal length dispersion of the time lens is completely determined by the dispersion experienced by the pump light, φ f ″=-φ p ″/2=-β 2p L p /2, β 2s and β 2i are the second-order dispersion coefficients of the two sections of fiber respectively, and β 2p is the second-order dispersion coefficient of the pump light transmission fiber; L s and Li are respectively The length of the two sections of fiber before and after, L p is the length of the fiber after the pump light undergoes dispersion broadening. When the difference between the second-order dispersion φ 1 ″ and φ 2 ″ of the two optical fibers and the focal length dispersion φ f ″ of the time lens satisfies the imaging condition , the amplification or compression of the input optical signal can be realized, wherein the amplification factor M=φ 2 ″/φ 1 ″.
现有技术存在的缺陷：无法实现光信号加密和解密、无法防止光信息被不法分子窃取和盗用。Defects in the existing technology: it is impossible to realize optical signal encryption and decryption, and it is impossible to prevent optical information from being stolen and embezzled by criminals.
发明内容Contents of the invention
为了克服现有技术无法实现光信号加密和解密、无法防止光信息被不法分子窃取和盗用的不足，本发明提供了一种有效实现光信号的加密与解密、安全性良好的基于时间透镜成像的光信号加/解密系统。In order to overcome the shortcomings of the existing technology that cannot realize optical signal encryption and decryption, and cannot prevent optical information from being stolen and embezzled by criminals, the present invention provides a time-based lens imaging system that can effectively realize optical signal encryption and decryption and has good security. Optical signal encryption/decryption system.
为了解决上述技术问题，本发明采用的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种基于时间透镜成像的光信号加/解密系统，包括时间透镜成像子系统；所述时间透镜成像子系统均由输入段光纤、时间透镜和输出段光纤构成，所述输出段光纤的二阶色散量φ2″与输入段光纤的二阶色散量φ1″相反，即φ2″＝-φ1″；所述时间透镜成像子系统的放大倍数M＝φ2″φ1″＝-1；在泵浦光序列流的所有0码时间段内，时间透镜效应不发生，其所涵盖时间段内的信号序列保持不变；在泵浦光序列流的所有1码时间段内，时间透镜效应发生，其所涵盖时间段内的信号序列发生反演。An optical signal encryption/decryption system based on time lens imaging, including a time lens imaging subsystem; the time lens imaging subsystem is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second order of the output section optical fiber The amount of dispersion φ 2 ″ is opposite to the amount of second-order dispersion φ 1 ″ of the input fiber, that is, φ 2 ″=-φ 1 ″; the magnification of the time lens imaging subsystem M=φ 2 ″φ 1 ″=-1 ; In all 0-yard time periods of the pump light sequence flow, the time lens effect does not occur, and the signal sequence in the time period covered by it remains unchanged; in all 1-yard time periods of the pump light sequence flow, the time lens The effect occurs and the sequence of signals over the time period it covers is inverted.
进一步，所述时间透镜成像子系统有两个，分别是第一个子系统和第二个子系统，第一个子系统为对信号序列进行反演而实现加密功能的加密子系统，第二个子系统为对信号序列再次反演从而使其恢复初始状态的解密子系统；Further, there are two time lens imaging subsystems, namely the first subsystem and the second subsystem, the first subsystem is an encryption subsystem for inverting the signal sequence to realize the encryption function, and the second subsystem The system is a decryption subsystem that inverts the signal sequence again to restore it to its original state;
所述第一个子系统中，泵浦光序列中0码与1码的随机特性，使得整个信号序列获得加密；所述第二个子系统中，加密信号序列流在同样的泵浦光序列流的再次作用之下，信号序列流获得解密，恢复为原始的信号序列流。In the first subsystem, the random characteristics of code 0 and code 1 in the pump light sequence enable the entire signal sequence to be encrypted; in the second subsystem, the encrypted signal sequence flow is in the same pump light sequence flow Under the action of , the signal sequence flow is decrypted and restored to the original signal sequence flow.
更进一步，由信号光与泵浦光在高非线性光纤中发生FWM来实现时间透镜效应。Furthermore, the time lens effect is realized by FWM of the signal light and the pump light in a highly nonlinear fiber.
或者是：由信号光与泵浦光在高非线性介质中发生FWM来实现时间透镜效应。Or: the time lens effect is realized by FWM of the signal light and the pump light in a highly nonlinear medium.
优选的，控制泵浦光脉冲宽度，使一个泵浦光脉宽能够涵盖不同时长的一组信号光序列，实现不同长度信号序列的反演加密和解密。Preferably, the pulse width of the pump light is controlled so that one pulse width of the pump light can cover a set of signal light sequences with different durations, so as to realize inversion encryption and decryption of signal sequences with different lengths.
本发明的技术构思为：在时间透镜成像系统中，当φ2″＝-φ1″时，放大倍数M＝-1，此时时间透镜成像系统的输出信号相对于输入信号实现了时间上的反演。利用时间透镜成像系统的这一特性，可用其实现光信号的加密与解密，为密码技术提供一种全新的实现方案。The technical idea of the present invention is: in the time lens imaging system, when φ 2 ″=-φ 1 ″, the magnification M=-1, at this time the output signal of the time lens imaging system has realized the time difference with respect to the input signal inversion. Using this feature of the time lens imaging system, it can be used to realize the encryption and decryption of optical signals, providing a new implementation scheme for cryptography.
本发明的有益效果体现在：泵浦光随机序列流在实现时间透镜效应的同时，也作为密钥实现了对信号序列的加密操作，该系统的优势尤其体现在可以实现超高速的光信号保密传输。The beneficial effect of the present invention is reflected in that the random sequence flow of pump light realizes the time lens effect and at the same time realizes the encryption operation of the signal sequence as a key, and the advantage of the system is particularly reflected in the fact that it can realize ultra-high-speed optical signal secrecy transmission.
附图说明Description of drawings
图1是本发明的系统构图，其中，(a)是加密子系统，(b)是解密子系统。Fig. 1 is a system composition diagram of the present invention, wherein, (a) is an encryption subsystem, and (b) is a decryption subsystem.
图2是时间透镜的原理图，信号光与泵浦光之间通过发生四波混频效应而获得了二次相位变化。Figure 2 is a schematic diagram of the time lens, and the quadratic phase change is obtained through the four-wave mixing effect between the signal light and the pump light.
图3是脉宽为5ps、间距为10ps的一对光脉冲对经过时间透镜成像子系统发生反演的示意图，其中，(a)是输入信号；(b)是输出信号。Fig. 3 is a schematic diagram of inversion of a pair of light pulses with a pulse width of 5 ps and an interval of 10 ps to the elapsed time lens imaging subsystem, where (a) is the input signal; (b) is the output signal.
图4是系统对信号序列流加密及解密的详细过程，其中，(a)是进入第一个时间透镜成像子系统，信号序列:110111011101,泵浦光序列:101，一个泵浦光(虚线)脉冲宽度涵盖4个信号光(实线)；(b)是经过第一个时间透镜成像子系统，实现了信号序列的加密，信号序列变为:101111011011；(c)进入第二个时间透镜成像子系统，信号序列：101111011011,泵浦光序列:101，一个泵浦光(虚线)脉冲宽度涵盖4个信号光(实线)；(d)是经过第二个时间透镜成像子系统，实现了信号序列的解密，信号序列恢复为:110111011101。Figure 4 is the detailed process of encryption and decryption of the signal sequence flow by the system, where (a) enters the first time lens imaging subsystem, signal sequence: 110111011101, pump light sequence: 101, one pump light (dotted line) The pulse width covers 4 signal lights (solid line); (b) passes through the first time lens imaging subsystem to realize the encryption of the signal sequence, and the signal sequence becomes: 101111011011; (c) enters the second time lens imaging Subsystem, signal sequence: 101111011011, pump light sequence: 101, the pulse width of one pump light (dotted line) covers 4 signal lights (solid line); (d) is through the second time lens imaging subsystem, realizing Decryption of the signal sequence, the signal sequence is restored to: 110111011101.
具体实施方式detailed description
下面结合附图通过具体实施方式对本发明作进一步说明，但本发明的保护范围并不限于此。The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.
参照图1～图4，一种基于时间透镜成像的光信号加/解密系统，包括时间透镜成像子系统；所述时间透镜成像子系统均由输入段光纤、时间透镜和输出段光纤构成，所述输出段光纤的二阶色散量φ2″与输入段光纤的二阶色散量φ1″相反，即φ2″＝-φ1″；所述时间透镜成像子系统的放大倍数M＝φ2″φ1″＝-1；在泵浦光序列流的所有0码时间段内，时间透镜效应不发生，其所涵盖时间段内的信号序列保持不变；在泵浦光序列流的所有1码时间段内，时间透镜效应发生，其所涵盖时间段内的信号序列发生反演。Referring to Figures 1 to 4, an optical signal encryption/decryption system based on time lens imaging includes a time lens imaging subsystem; the time lens imaging subsystem is composed of an input section of optical fiber, a time lens and an output section of optical fiber, so The second-order dispersion amount φ 2 "of the output section fiber is opposite to the second-order dispersion amount φ 1 " of the input section fiber, that is, φ 2 "=-φ 1 "; the magnification M of the time lens imaging subsystem = φ 2 ″φ 1 ″=-1; in all 0 yard time periods of the pump light sequence flow, the time lens effect does not occur, and the signal sequence in the time period covered by it remains unchanged; in all 1 yard time periods of the pump light sequence flow In the code time period, the time lens effect occurs, and the signal sequence in the time period covered by it is inverted.
本实施例的系统包括两个完全一样的时间透镜成像子系统，每个子系统均由输入段光纤、时间透镜和输出段光纤三部分构成，其中时间透镜是由泵浦光和信号光在高非线性介质中的FWM效应来实现。时间透镜成像子系统的特征在于输出段光纤的二阶色散量与输入段光纤相反，即φ2″＝-φ1″，此时M＝-1。当时间透镜效应真实发生时，能够实现对输入光信号的反演操作；当时间透镜效应不存在时，光信号不发生反演。时间透镜效应的存在于否，取决于泵浦光是否存在。在泵浦光序列流中的所有1码时间段内，时间透镜效应发生，信号被反演，在泵浦光序列流的所有0码时间段内，时间透镜效应不存在，信号不发生变化。The system of this embodiment includes two identical time lens imaging subsystems, each subsystem is composed of three parts: the input section optical fiber, the time lens and the output section optical fiber, wherein the time lens is composed of pump light and signal light at high The FWM effect in the linear medium is realized. The characteristic of the time lens imaging subsystem is that the second-order dispersion of the fiber in the output section is opposite to that of the fiber in the input section, that is, φ 2 ″=-φ 1 ″, and M=-1 at this time. When the time lensing effect actually occurs, the inversion operation of the input optical signal can be realized; when the time lensing effect does not exist, the optical signal does not invert. Whether the time lens effect exists or not depends on whether the pump light exists. In all 1-yard time periods of the pump light sequence flow, the time lens effect occurs, and the signal is inverted. In all 0-yard time periods of the pump light sequence flow, the time lens effect does not exist, and the signal does not change.
参照图1，为满足的成像条件，两个时间透镜成像子系统的参数均选择为：β2s＝20ps2/km，Ls＝1km，β2i＝-20ps2/km，Li＝1km，β2p＝20ps2/km，Lp＝1km。此时，φ2″＝-φ1″，M＝-1。Referring to Figure 1, in order to satisfy The imaging conditions of the two time lens imaging subsystems are selected as follows: β 2s = 20ps 2 /km, L s = 1km, β 2i = -20ps 2 /km, L i = 1km, β 2p = 20ps 2 / km, Lp = 1 km. At this time, φ 2 ″=-φ 1 ″, M=-1.
图3展示了脉宽为T0＝5ps,间距为ΔT＝10ps的一对光脉冲在经过时间透镜成像子系统之后发生了时间上的反演。Figure 3 shows the time inversion of a pair of light pulses with a pulse width of T 0 =5 ps and an interval of ΔT = 10 ps after passing through the time lens imaging subsystem.
图4阐述了信号序列流经过该系统发生加密与解密的详细过程。在图4(a)中，信号序列流110111011101经过第一个时间透镜成像子系统时，与随机的泵浦光序列流101发生FWM,一个泵浦光的脉冲宽度相当于四个信号光脉冲宽度。因此，信号序列流被分成1101、1101和1101三组码元并分别与三个泵浦光码元1、0和1发生FWM作用，显然第一组和第三组信号码元与1码泵浦光发生FWM作用而产生反演，均变化为1011，而第二组信号码元因为泵浦光为0码不能发生FWM作用，时间透镜成像效果不发生，所以第二组信号码元仍旧为1101。这样经过第一个时间透镜成像子系统之后，原来的信号序列流110111011101就变化为图4(b)中的101111011011，实现了信号序列的加密过程。图4(c)则是加密之后的信号序列流101111011011在到达目的地之后进入第二个时间透镜成像子系统进行解密，采用与加密时完全一样的泵浦光序列流101对信号序列流进行解密，则可使其恢复为原始信号序列流110111011101，如图4(d)所示。Figure 4 illustrates the detailed process of encryption and decryption of the signal sequence flow through the system. In Figure 4(a), when the signal sequence flow 110111011101 passes through the first temporal lens imaging subsystem, FWM occurs with the random pump light sequence flow 101, and the pulse width of one pump light is equivalent to four signal light pulse widths . Therefore, the signal sequence flow is divided into three groups of symbols 1101, 1101 and 1101, and FWM with the three pump light symbols 1, 0 and 1, respectively. Obviously, the first group and the third group of signal symbols and 1 code pump The inversion occurs due to the FWM effect of the pump light, and the change is 1011, while the second group of signal symbols cannot undergo the FWM effect because the pump light is 0 yards, and the time lens imaging effect does not occur, so the second group of signal symbols is still as 1101. In this way, after the first time lens imaging subsystem, the original signal sequence flow 110111011101 is changed to 101111011011 in Fig. 4(b), realizing the encryption process of the signal sequence. Figure 4(c) shows that the encrypted signal sequence flow 101111011011 enters the second time lens imaging subsystem for decryption after arriving at the destination, and uses the same pump light sequence flow 101 as that used for encryption to decrypt the signal sequence flow , then it can be restored to the original signal sequence flow 110111011101, as shown in Figure 4(d).
在上述实施例中，除了让一个泵浦光脉冲涵盖4个信号光之外，调整泵浦光宽度，还可以使一个泵浦光脉冲能够涵盖2个、3个、5个或更多个信号光脉冲，从而能够实现更多的加密方式。In the above embodiment, in addition to allowing one pump light pulse to cover 4 signal lights, adjusting the pump light width can also make one pump light pulse cover 2, 3, 5 or more signals Light pulses, enabling more encryption methods.
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Cited By (7)
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| CN107786333A (en) * | 2017-11-02 | 2018-03-09 | 浙江工业大学 | A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging |
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| CN110677197A (en) * | 2019-09-25 | 2020-01-10 | 浙江工业大学 | CDMA coding system based on time lens |
| CN111474803A (en) * | 2020-04-03 | 2020-07-31 | 浙江工业大学 | An All-optical XOR Optical Logic Gate Operation System Based on Time Lens Imaging |
| CN112379556A (en) * | 2020-11-04 | 2021-02-19 | 浙江工业大学 | RZ code duty cycle adjusting system based on time lens |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107786333A (en) * | 2017-11-02 | 2018-03-09 | 浙江工业大学 | A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging |
| CN107786333B (en) * | 2017-11-02 | 2023-11-28 | 浙江工业大学 | Optical signal two-dimensional encryption/decryption system based on time lens imaging |
| CN109407351A (en) * | 2018-10-25 | 2019-03-01 | 南京航空航天大学 | Time lens implementation method, device and photon Fourier Transform System |
| CN109407351B (en) * | 2018-10-25 | 2020-03-17 | 南京航空航天大学 | Time lens implementation method and device and photon Fourier transformation system |
| CN110231745A (en) * | 2019-04-18 | 2019-09-13 | 浙江工业大学 | A kind of light logic inverter arithmetic system based on time lens imaging |
| CN110221501A (en) * | 2019-05-23 | 2019-09-10 | 浙江工业大学 | A kind of stack system for realizing optical signal based on time lens imaging system |
| CN110677197A (en) * | 2019-09-25 | 2020-01-10 | 浙江工业大学 | CDMA coding system based on time lens |
| CN111474803A (en) * | 2020-04-03 | 2020-07-31 | 浙江工业大学 | An All-optical XOR Optical Logic Gate Operation System Based on Time Lens Imaging |
| CN112379556A (en) * | 2020-11-04 | 2021-02-19 | 浙江工业大学 | RZ code duty cycle adjusting system based on time lens |
| CN112379556B (en) * | 2020-11-04 | 2022-06-17 | 浙江工业大学 | RZ code duty cycle adjusting system based on time lens |
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