CN111277338A - Device for generating broadband chaotic laser - Google Patents
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- CN111277338A CN111277338A CN202010111358.7A CN202010111358A CN111277338A CN 111277338 A CN111277338 A CN 111277338A CN 202010111358 A CN202010111358 A CN 202010111358A CN 111277338 A CN111277338 A CN 111277338A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- 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
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- 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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0869—Generation of secret information including derivation or calculation of cryptographic keys or passwords involving random numbers or seeds
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Abstract
The invention discloses a device for generating broadband chaotic laser, which is characterized in that chaotic laser output by a chaotic laser source 1 is divided into two paths: one path of the chaotic signal is converted into an electric domain chaotic signal through a photoelectric detector, and the electric domain chaotic signal is amplified by a radio frequency amplifier and then is used as the radio frequency input of a phase modulator in the chaotic laser source 2; the other path is used as broadband chaotic laser finally generated by the chaotic laser source 1; the output optical signal of the phase modulator in the chaotic laser source 2 is also divided into two paths: one path is injected into a semiconductor laser in the chaotic laser source 1; and the other path of the laser beam passes through a dispersion module and then is used as broadband chaotic laser finally generated by the chaotic laser source 2.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a device for generating broadband chaotic laser.
Background
The chaotic laser has important application in the fields of secret optical communication, high-speed physical random number generation, high-resolution anti-interference radar detection and the like. The wide-band wide-amplitude chaotic laser is used as a carrier wave for hiding information, and then chaotic synchronization is used for carrying out information demodulation, so that the encrypted communication of high-speed information can be realized; due to the characteristics of high bandwidth and large amplitude noise-like of the chaotic laser, the chaotic laser is used as a new generation of physical entropy source to solve the problem of insufficient real-time generation rate of physical random numbers; the radar system is constructed by using the broadband chaotic laser as a signal source, so that the range resolution of target detection can be effectively improved.
The external cavity semiconductor laser becomes the most common light source for chaotic laser generation and application due to the advantages of simple structure, convenient operation, easy integration and the like.
However, after intensive research, the researchers found that the chaotic laser generated by the external cavity semiconductor laser has some defects that (1) the external cavity semiconductor laser has obvious relaxation oscillation, and the main energy of the chaotic laser is concentrated near the relaxation oscillation frequency from the observation of a power spectrum, thereby limiting the effective bandwidth and the flatness of the power spectrum; (2) due to the existence of external cavity resonance, an obvious correlation peak appears on the generated autocorrelation curve of the chaotic signal at the external cavity period, and the characteristic is called as a time delay label; the presence of these defects limits practical applications.
In secret communication, the bandwidth of chaotic laser is only several GHz due to relaxation oscillation, and the limited bandwidth can limit the transmission rate of chaotic optical communication; meanwhile, the time delay characteristic reveals the length of an external cavity, so that an interception party can reconstruct a chaotic carrier signal by using the key structure information, further crack transmitted information and weaken the safety of a communication system. In physical random number generation, the limited entropy source bandwidth limits the rate at which physical random numbers are generated; the time delay characteristic deteriorates the randomness and the equalization ratio of 0 and 1 bits, and needs to be optimized by utilizing complex subsequent processing. In the aspect of radar detection, limited bandwidth limits the improvement of the detection distance resolution of the chaotic laser; the time delay feature also reduces the security and anti-interference capability of the radar system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device for generating broadband chaotic laser, which can simultaneously generate two paths of irrelevant high-broadband chaotic signals, has flat power spectrum and high complexity and can effectively inhibit a time delay label.
In order to achieve the above object, the present invention provides an apparatus for generating broadband chaotic laser, comprising:
a first chaotic laser source comprising: the optical fiber delay line optical attenuator comprises a semiconductor laser SL, an optical fiber coupler FC, an adjustable optical fiber delay line DL, an optical circulator OC, an optical fiber reflector M and an adjustable optical attenuator VOA;
the semiconductor laser SL generates a laser signal, the laser signal is divided into two paths by a first optical fiber coupler FC, one path of the laser signal is directly input into an adjustable optical delay line DL, is attenuated by a first adjustable optical attenuator VOA after being subjected to delay processing of the adjustable optical delay line DL, and is finally reflected by an optical fiber reflector M and returns to the semiconductor laser SL, so that a feedback optical loop is formed; the other path of laser signal is divided into two paths by a second optical fiber coupler FC, wherein one path of laser signal controls the optical transmission direction through an optical circulator OC, is input from a second port of the optical circulator OC and is output from a third port, and the output optical signal is converted into an electric domain chaotic signal through a first photoelectric detector PD and is used as broadband chaotic laser output by a first chaotic laser source; the other path of laser signal is directly input to a second chaotic laser source;
a second chaotic laser source comprising: a continuous wavelength laser CW, a phase modulator PM, a fiber coupler FC, a variable optical attenuator VOA, a radio frequency amplifier RF, a photoelectric detector PD and a dispersion module DM;
after a laser signal output by the second optical fiber coupler FC is input to the second chaotic laser source, the laser signal is sequentially attenuated by the second variable optical attenuator VOA, converted into an electric domain chaotic signal by the third photoelectric detector PD and subjected to amplitude amplification by the radio frequency amplifier RF to be used as a radio frequency input signal of the phase modulator PM; a continuous wavelength laser CW generates a laser signal and inputs the laser signal to a phase modulator PM, and the phase modulation is carried out on a radio frequency input signal received by a radio frequency input end in the PM so as to output a modulated optical signal; the modulated optical signal is divided into two paths by a third optical fiber coupler FC, wherein one path of laser signal is injected into a first chaotic laser source after being attenuated by a third variable optical attenuator VOA, the transmission direction of the optical signal is controlled by an optical circulator OC, the optical signal is input from a first port of the optical circulator OC and output from a second port, and then the optical signal is injected into a semiconductor laser SL; the other path of laser signal is converted from phase modulation to intensity modulation through the nonlinear effect of the dispersion module DM, and then is converted into an electric domain chaotic signal through the second photoelectric detector PD, and the electric domain chaotic signal is used as broadband chaotic laser output by the second chaotic laser source.
The invention aims to realize the following steps:
the invention relates to a device for generating broadband chaotic laser, which is characterized in that chaotic laser output by a chaotic laser source 1 is divided into two paths: one path of the chaotic signal is converted into an electric domain chaotic signal through a photoelectric detector, and the electric domain chaotic signal is amplified by a radio frequency amplifier and then is used as the radio frequency input of a phase modulator in the chaotic laser source 2; the other path is used as broadband chaotic laser finally generated by the chaotic laser source 1; the output optical signal of the phase modulator in the chaotic laser source 2 is also divided into two paths: one path is injected into a semiconductor laser in the chaotic laser source 1; and the other path of the laser beam passes through a dispersion module and then is used as broadband chaotic laser finally generated by the chaotic laser source 2.
Meanwhile, the device for generating the broadband chaotic laser also has the following beneficial effects:
(1) the invention can simultaneously generate two chaotic laser signals with high bandwidth and high spectral flatness;
(2) the invention can effectively eliminate the time delay characteristic caused by external cavity feedback;
(3) the two paths of broadband chaos generated by the invention are irrelevant;
(4) the invention is applied to secret communication, and can improve the transmission rate and the safety of chaotic carrier; the method is applied to random numbers, is used as a physical entropy source of a random number generator, can improve the rate of generating the random numbers, and does not need a complex post-processing method to eliminate the influence of time delay characteristics; in addition, the invention can improve the range resolution of radar detection, and simultaneously, the elimination of the time delay characteristic improves the safety and the anti-interference capability of a radar system.
Drawings
FIG. 1 is a block diagram of an embodiment of an apparatus for generating broadband chaotic laser according to the present invention;
fig. 2 is a time domain waveform and a power spectrum of the wide-band chaotic signal output by the chaotic laser source 1 and the chaotic laser source 2;
fig. 3 is an autocorrelation curve and a cross-correlation curve of output signals of the chaotic laser source 1 and the chaotic laser source 2.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Examples
FIG. 1 is a block diagram of an embodiment of an apparatus for generating broadband chaotic laser according to the present invention.
In this embodiment, as shown in fig. 1, an apparatus for generating broadband chaotic laser according to the present invention includes:
the semiconductor laser SL generates a laser signal, the laser signal is divided into two paths by the optical fiber coupler FC1, wherein one path of the laser signal is directly input to the light-adjustable delay line DL, is attenuated by the light-adjustable optical attenuator VOA1 after being subjected to delay processing of the light-adjustable delay line DL, and is finally reflected by the optical fiber reflector M and returns to the semiconductor laser SL, so that a feedback optical loop is formed; the other path of laser signal split from the optical fiber coupler FC1 is split into two paths by the optical fiber coupler FC2, wherein one path of laser signal passes through the optical circulator OC to control the optical transmission direction, is input from the port 2 of the OC and is output from the port 3, and the output optical signal is converted into an electric domain chaotic signal by the photoelectric detector PD1 and is used as broadband chaotic laser output by the chaotic laser source 1; the other path of laser signal branched by the fiber coupler FC2 is directly input to the chaotic laser source 2;
After a laser signal output by the fiber coupler FC2 is input to the chaotic laser source 2, the laser signal is sequentially attenuated by the variable optical attenuator VOA2, converted into an electric domain chaotic signal through the photoelectric detector PD3, and then subjected to amplitude amplification by the radio frequency amplifier RF to be used as a radio frequency input signal of the phase modulator PM; a continuous wavelength laser CW generates a laser signal and inputs the laser signal to a phase modulator PM, and the phase modulation is carried out on a radio frequency input signal received by a radio frequency input end in the PM so as to output a modulated optical signal; the modulated optical signal is divided into two paths through an optical fiber coupler FC3, wherein one path of laser signal is injected into the chaotic laser source 1 after being attenuated by the variable optical attenuator VOA3, the transmission direction of the optical signal is controlled through OC, the optical signal is input from an OC port 1 and output from a OC port 2, and then the optical signal is injected into SL; the other path of laser signal split by the fiber coupler FC3 is converted from phase modulation to intensity modulation by the nonlinear effect of the dispersion module DM, and then converted into an electric domain chaotic signal by the photodetector PD2, and used as the broadband chaotic laser output by the chaotic laser source 2.
Fig. 2 shows a time domain waveform and a power spectrum of the broadband chaotic signal output by the chaotic laser source 1 and the chaotic laser source 2.
In this embodiment, as shown in fig. 2, the first row (a) and (b) are two graphs of the chaotic signal generated by the conventional ECSL, the second row (c) and (d) are two graphs of the time domain waveform and the power spectrum of the output signal of the chaotic laser source 1, and the third row (e) and (f) are two graphs of the time domain waveform and the power spectrum of the output signal of the chaotic laser source 2; as can be seen from the figure, the chaotic signals generated by the two chaotic sources have high bandwidth and flat power spectrum. For chaotic signals generated by the traditional ECSL, as the main frequency components are concentrated near relaxation oscillation frequency, the effective bandwidth is usually only a few GHz, but through the scheme provided by the invention, the power spectrum is obviously widened, and the effective bandwidths of two paths of output signals exceed 24 GHz. Furthermore, the effective bandwidth in the results here is limited mainly by the bandwidth of the electronics (photodetector, coaxial cable and oscilloscope) in the experiments. Therefore, when an electronic device with a higher bandwidth is used, the bandwidth of the actual chaotic signal is wider.
Fig. 3 is an autocorrelation curve and a cross-correlation curve of output signals of the conventional ECSL, the chaotic laser source 1, and the chaotic laser source 2.
In the present embodiment, fig. 3(a), (b), (c) are autocorrelation curves of output signals of the conventional ECSL, the chaotic laser source 1 and the chaotic laser source 2, respectively, and fig. 3(d) is a cross-correlation curve between two chaotic sources; we use an autocorrelation function (ACF) to show the results of the delay label cancellation. For chaotic signals generated by the traditional ECSL, an autocorrelation curve has an obvious correlation peak at the feedback delay, and by the scheme provided by the invention, the delay characteristic of external cavity feedback is effectively eliminated, and the obvious correlation peak cannot be seen on the autocorrelation curve. In addition, a cross-correlation curve between two output chaotic signals is shown, and it can be seen that no obvious correlation peak is seen on the cross-correlation curve, which indicates that there is no correlation between the two chaotic signals.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (5)
1. An apparatus for generating broadband chaotic laser light, comprising:
a first chaotic laser source comprising: the optical fiber delay line optical attenuator comprises a semiconductor laser SL, an optical fiber coupler FC, an adjustable optical fiber delay line DL, an optical circulator OC, an optical fiber reflector M and an adjustable optical attenuator VOA;
the semiconductor laser SL generates a laser signal, the laser signal is divided into two paths by a first optical fiber coupler FC, one path of the laser signal is directly input into an adjustable optical delay line DL, is attenuated by a first adjustable optical attenuator VOA after being subjected to delay processing of the adjustable optical delay line DL, and is finally reflected by an optical fiber reflector M and returns to the semiconductor laser SL, so that a feedback optical loop is formed; the other path of laser signal is divided into two paths by a second optical fiber coupler FC, wherein one path of laser signal controls the optical transmission direction through an optical circulator OC, is input from a second port of the optical circulator OC and is output from a third port, and the output optical signal is converted into an electric domain chaotic signal through a first photoelectric detector PD and is used as broadband chaotic laser output by a first chaotic laser source; the other path of laser signal is directly input to a second chaotic laser source;
a second chaotic laser source comprising: a continuous wavelength laser CW, a phase modulator PM, a fiber coupler FC, a variable optical attenuator VOA, a radio frequency amplifier RF, a photoelectric detector PD and a dispersion module DM;
after a laser signal output by the second optical fiber coupler FC is input to the second chaotic laser source, the laser signal is sequentially attenuated by the second variable optical attenuator VOA, converted into an electric domain chaotic signal by the third photoelectric detector PD and subjected to amplitude amplification by the radio frequency amplifier RF to be used as a radio frequency input signal of the phase modulator PM; a continuous wavelength laser CW generates a laser signal and inputs the laser signal to a phase modulator PM, and the phase modulation is carried out on a radio frequency input signal received by a radio frequency input end in the PM so as to output a modulated optical signal; the modulated optical signal is divided into two paths by a third optical fiber coupler FC, wherein one path of laser signal is injected into a first chaotic laser source after being attenuated by a third variable optical attenuator VOA, the transmission direction of the optical signal is controlled by an optical circulator OC, the optical signal is input from a first port of the optical circulator OC and output from a second port, and then the optical signal is injected into a semiconductor laser SL; the other path of laser signal is converted from phase modulation to intensity modulation through the nonlinear effect of the dispersion module DM, and then is converted into an electric domain chaotic signal through the second photoelectric detector PD, and the electric domain chaotic signal is used as broadband chaotic laser output by the second chaotic laser source.
2. The device according to claim 1, wherein the semiconductor laser SL is selected from a DFB or a VCSEL.
3. The apparatus of claim 1, wherein the phase modulator PM is an electro-optical phase modulator or a mach-zehnder modulator.
4. The apparatus of claim 1, wherein the dispersion module DM is a single mode fiber, a dispersion compensation fiber, or a dispersion grating.
5. The device for generating broadband chaotic laser according to claim 1, wherein the dispersion module DM is replaced by a time delay interferometer or an optical filter or a Sagnac interferometer.
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| CN112787797A (en) * | 2021-01-28 | 2021-05-11 | 杭州电子科技大学 | Safe chaotic communication system |
| CN113488839A (en) * | 2021-05-26 | 2021-10-08 | 太原理工大学 | Broadband chaotic laser generation device and method based on asymmetric double-path optical feedback |
| CN113794109A (en) * | 2021-09-15 | 2021-12-14 | 电子科技大学 | Multi-path low-correlation laser chaotic generation system based on semiconductor laser network |
| CN113933852A (en) * | 2021-10-13 | 2022-01-14 | 西南大学 | Photoelectric dual-mode anti-interference distance measuring device and method based on broadband chaotic correlation method |
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Cited By (10)
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| CN113488839B (en) * | 2021-05-26 | 2022-08-16 | 太原理工大学 | Broadband chaotic laser generation device and method based on asymmetric double-path optical feedback |
| CN113794109A (en) * | 2021-09-15 | 2021-12-14 | 电子科技大学 | Multi-path low-correlation laser chaotic generation system based on semiconductor laser network |
| CN113933852A (en) * | 2021-10-13 | 2022-01-14 | 西南大学 | Photoelectric dual-mode anti-interference distance measuring device and method based on broadband chaotic correlation method |
| CN113933852B (en) * | 2021-10-13 | 2022-07-19 | 西南大学 | Photoelectric dual-mode anti-interference distance measuring device and method based on broadband chaotic correlation method |
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