CN110797745B - Broadband chaos generating device without time delay characteristic - Google Patents
Broadband chaos generating device without time delay characteristic Download PDFInfo
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- CN110797745B CN110797745B CN201911099211.4A CN201911099211A CN110797745B CN 110797745 B CN110797745 B CN 110797745B CN 201911099211 A CN201911099211 A CN 201911099211A CN 110797745 B CN110797745 B CN 110797745B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
- H01S5/0612—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0057—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for temporal shaping, e.g. pulse compression, frequency chirping
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Abstract
The invention belongs to a high-speed chaotic communication carrier, in particular to a broadband chaotic generating device without time delay characteristics, which solves the problems in the background technology. In the device, a semiconductor laser is connected with an input end of a polarization controller, an output end of the polarization controller is connected to an input end of a 1x2 optical fiber coupler, a first output end of the 1x2 optical fiber coupler is connected to a red port of an optical circulator through an erbium-doped optical fiber amplifier, a second output end of the 1x2 optical fiber coupler is connected with an optical reflection device through an attenuator, the splitting ratio of the first output end to the second output end of the 1x2 optical fiber coupler is more than or equal to one, a blue port of the optical circulator is connected with a chirped fiber grating, and a white port of the optical circulator is used as an output terminal of a chaotic signal. The invention has simple structure and easy operation, can generate chaotic signals with flat frequency spectrum and large bandwidth and without time delay characteristics, and can simultaneously realize the functions of improving low-frequency energy components, widening frequency spectrum, eliminating time delay characteristics and relaxing oscillation characteristics.
Description
Technical Field
The invention relates to a high-speed chaotic communication carrier, in particular to a broadband chaotic generating device without a time delay characteristic.
Background
The chaotic signal is widely applied to chaotic secret communication, random number generation, chaotic radar and other aspects due to the characteristics of wide frequency spectrum, noise-like performance, randomness and the like. In a chaotic signal generated by a traditional semiconductor laser system based on external cavity feedback, the intrinsic parameter relaxation oscillation frequency of a laser generally controls the oscillation of the chaotic signal. Therefore, in the frequency spectrum of the chaotic signal, most energy is concentrated near the relaxation oscillation frequency, low-frequency energy cannot be effectively utilized, the bandwidth is usually only several GHz, and the signal transmission capability, the random number generation rate and the radar resolution of the optical chaotic based secure communication system are severely limited. In addition, due to the linear effect of the feedback of the common light reflection device, the external cavity resonance generates periodic variation, and obvious time delay characteristics are generated. The time delay characteristic threatens the safety in secret communication and reduces the randomness of random numbers and the precision of the chaotic radar. Therefore, it is important to explore a chaos generation scheme that can realize bandwidth enhancement and can suppress the delay characteristics.
In order to achieve the above object, some methods have been proposed in recent years. Although the optical heterodyne of the external cavity feedback semiconductor laser utilized by the university of tai theory engineering group can generate white chaotic signals with flat frequency spectrum and without any feedback delay and relaxation oscillation characteristics, and the frequency spectrum fluctuation in the range of 0-11 GHz is only +/-1 dB, the whole device has complex structure, high cost and great operation difficulty (Optics Express, 2013, 21(7): 8701-8710). The Jiangning project group of the university of electronic Technology respectively proposes the combination of electro-optical phase modulation and a delay interference feedback loop and the combination of self-phase modulation and a single-mode optical fiber with dispersion, and although chaotic signals with large flat frequency spectrum bandwidth and eliminated time delay characteristic are obtained, the whole device has complex structure, high cost and larger operation difficulty (Optics express, 2019, 27(9): 12336-. In addition, although the chaos signal generated by the external cavity feedback semiconductor laser is passed through the single mode fiber by the minister jun topic group at hong Kong City university, the bandwidth can be increased to more than 100GHz and the delay characteristic is suppressed to below 0.04 by adopting a simpler device, the low frequency component of the chaos signal is not improved in the scheme (Optics letters, 2018, 43(19): 4751 + 4754). The task group of tai-rationality university passes the chaotic signal generated by the external cavity feedback semiconductor laser through the fiber bragg grating, so that the low-frequency component can be effectively improved, and the chaotic signal with the frequency spectrum bandwidth of about 8GHz and the flatness of +/-1.4 dB is generated, but the improvement of low-frequency energy and the elimination of time delay characteristics cannot be simultaneously realized (IET Optoelectronics, 2018, 13(3): 104- "108).
Disclosure of Invention
The invention aims to solve the problems that the device structure is complicated and the cost is high in the scheme of improving the bandwidth of the chaotic frequency spectrum and eliminating the time delay characteristic in the background technology; in the scheme with simple structure, the technical problems of improving low-frequency energy, widening frequency spectrum and eliminating time delay characteristics cannot be simultaneously realized. Therefore, the invention provides a broadband chaos generating device without time delay characteristics, which has a simple structure, can improve low-frequency energy, can enhance bandwidth and can eliminate time delay characteristics.
The technical scheme adopted by the invention for solving the technical problems is as follows: a broadband chaotic generating device without time delay characteristics comprises a semiconductor laser, a polarization controller, a 1x2 optical fiber coupler, a light reflecting device and an optical circulator; the output end of the semiconductor laser is connected with the input end of the polarization controller, the output end of the polarization controller is connected to the input end of the 1x2 optical fiber coupler, the first output end of the 1x2 optical fiber coupler is connected to the red port of the optical circulator through the erbium-doped optical fiber amplifier, the second output end of the 1x2 optical fiber coupler is connected with the optical reflection device through the attenuator, the splitting ratio of the first output end to the second output end of the 1x2 optical fiber coupler is more than or equal to one, the blue port of the optical circulator is connected with the chirped fiber grating, and the white port of the optical circulator is used as the output terminal of the chaotic signal.
The working process of the broadband chaos generating device without the time delay characteristic comprises the following steps: the light output by the semiconductor laser sequentially passes through the polarization controller and the 1x2 optical fiber coupler, the light output by the second output end of the 1x2 optical fiber coupler reaches the light reflecting device through the attenuator, and returns to the semiconductor laser according to the original path after being fed back by the light reflecting device, so as to generate chaotic signals; the light output by the first output end of the 1x2 optical fiber coupler is amplified by the erbium-doped optical fiber amplifier, the amplified signal is input by the red port of the optical circulator, is output to the chirped fiber grating by the blue port, is output from the white port of the optical circulator after being reflected by the chirped fiber grating, and the output signal is a chaotic signal with large flat frequency spectrum and large bandwidth and eliminated time delay characteristic; the wavelength of the chaotic signal is changed by adjusting the temperature controller of the semiconductor laser, so that the wavelength of the chaotic signal is matched with the wavelength of a chirp fiber grating reflection spectrum, and the chaotic signal with flat frequency spectrum, large bandwidth and no time delay characteristic is generated.
The invention has the beneficial effects that: the broadband chaos generating device without the time delay characteristic has a simple structure, is easy to operate, and can generate a chaos signal with a flat frequency spectrum and a large bandwidth and without the time delay characteristic; the chaotic signal generated by the device can simultaneously realize the functions of improving low-frequency energy components, widening frequency spectrum, eliminating time delay characteristics and relaxation oscillation characteristics.
Drawings
FIG. 1 is a schematic structural diagram of a wide-band chaos generating device without delay feature according to the present invention;
FIG. 2 is a frequency spectrum and autocorrelation diagram of a chaotic signal generated by the feedback of an optical reflection device in the present invention;
fig. 3 is a frequency spectrum and autocorrelation diagram of the chaotic signal generated by the broadband chaotic generator without the time delay feature according to the present invention.
In the figure: 1-a semiconductor laser; 2-a polarization controller; 3-1x2 fiber coupler; 4-an optical circulator; 5-a light reflecting device; 6-erbium doped fiber amplifier; 7-an attenuator; 8-chirped fiber grating.
Detailed Description
Referring to fig. 1 to 2, a broadband chaotic generator without a delay characteristic according to the present invention will be described.
A broadband chaotic generating device without time delay characteristics is shown in figure 1 and comprises a semiconductor laser 1, a polarization controller 2, a 1x2 optical fiber coupler 3, an optical circulator 4 and an optical reflecting device 5; the output end of the semiconductor laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected to the input end of the 1x2 optical fiber coupler 3, the first output end of the 1x2 optical fiber coupler 3 is connected to the red port of the optical circulator 4 through the erbium-doped optical fiber amplifier 6, the second output end of the 1x2 optical fiber coupler 3 is connected to the input end of the optical reflection device 5 through the attenuator 7, the splitting ratio of the first output end to the second output end of the 1x2 optical fiber coupler 3 is greater than or equal to one, the blue port of the optical circulator 4 is connected with the chirped fiber grating 8, and the white port of the optical circulator 4 is used as the output terminal of the chaotic signal.
The working process of the broadband chaos generating device without the time delay characteristic comprises the following steps: the light output by the semiconductor laser 1 sequentially passes through the polarization controller 2 and the 1x2 optical fiber coupler 3, the light output by the second output end of the 1x2 optical fiber coupler 3 reaches the light reflecting device 5 through the attenuator 7, and returns to the semiconductor laser 1 according to the original path after being fed back by the light reflecting device 5, so as to generate a chaotic signal; light output by a first output end of the 1x2 optical fiber coupler 3 is amplified by the erbium-doped optical fiber amplifier 6, the amplified signal is input through a red port of the optical circulator 4, is output into the chirped fiber grating 8 through a blue port, is reflected by the chirped fiber grating 8 and is output from a white port of the optical circulator 4, and the output signal is a chaotic signal with large flat frequency spectrum and large bandwidth and eliminated time delay characteristic; the wavelength of the chaotic signal is controlled by adjusting the temperature controller of the semiconductor laser 1, so that the wavelength of the chaotic signal is matched with the wavelength of a reflection spectrum of the chirped fiber grating 8, and the chaotic signal with flat frequency spectrum, large bandwidth and no time delay characteristic is generated.
Further, as a specific embodiment of the broadband chaotic generator without a time delay feature according to the present invention, a splitting ratio of the first output end and the second output end of the 1x2 optical fiber coupler 3 is 80: 20. the chaotic signal generated under the splitting ratio has the best effects of flat frequency spectrum, large bandwidth and no time delay characteristic.
Further, as a specific embodiment of the broadband chaotic generator without the time delay feature according to the present invention, the light reflection device 5 is a mirror or a grating. Both the mirror and the grating act as reflections.
Further, as a specific embodiment of the broadband chaotic generating device without the time delay feature according to the present invention, the light reflecting device 5 is replaced by a second semiconductor laser. When the reflecting device 5 is replaced with a second semiconductor laser, a chaotic optical signal can be generated by optical injection or mutual injection.
Further, as a specific embodiment of the broadband chaotic generator without the time delay feature according to the present invention, the chromatic dispersion of the chirped fiber grating 8 is 2000 ps/nm. The key to the generation of broadband time delay-free characteristics of the invention is based on the nonlinear effect caused by the dispersion of the chirped fiber grating 8. The larger the dispersion value of the chirped fiber grating 8 is, the better the effect is, and 2000ps/nm is the minimum dispersion when the effect is better. Considering that the chirped fiber grating 8 having a large dispersion value has a complicated manufacturing process, 2000ps/nm is used as the value used in the present invention. Theoretically, the dispersion value of 2000ps/nm or more can achieve the effect of the present invention.
Fig. 2 (a) is a frequency spectrum of a chaotic signal generated by optical feedback. In the figure, the relaxation oscillation frequency is about 5GHz, the frequency spectrum energy in the range of 0-5 GHz is low, and the 80% energy bandwidth is about 5.6 GHz. In the autocorrelation curve of fig. 2 (b), a significant delay characteristic occurs at a delay of 120ns, and the peak of the delay characteristic is about 0.2. Fig. 3 (a) is a spectrum of a signal generated using the apparatus of the present invention. The low-frequency energy in the graph is improved, the relaxation oscillation characteristics are eliminated, the frequency spectrum bandwidth is improved to 16GHz, the frequency spectrum is flattened, and the flatness is +/-2.26 dB. In the autocorrelation curve of fig. 3 (b), the delay characteristic at 120ns is eliminated. Therefore, the invention can generate the broadband chaotic signal without time delay characteristics.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A broadband chaotic generating device without time delay characteristic is characterized by comprising a semiconductor laser (1), a polarization controller (2), a 1x2 optical fiber coupler (3), an optical circulator (4) and an optical reflecting device (5); the output end of the semiconductor laser (1) is connected with the input end of the polarization controller (2), the output end of the polarization controller (2) is connected to the input end of a 1x2 optical fiber coupler (3), the first output end of the 1x2 optical fiber coupler (3) is connected to the red port of the optical circulator (4) through an erbium-doped optical fiber amplifier (6), the second output end of the 1x2 optical fiber coupler (3) is connected with an optical reflection device (5) through an attenuator (7), the splitting ratio of the first output end and the second output end of the 1x2 optical fiber coupler (3) is more than or equal to one, the blue port of the optical circulator (4) is connected with a chirped optical fiber grating (8) with a dispersion value more than or equal to 2000ps/nm, and the white port of the optical circulator (4) is used as an output terminal of a chaotic signal.
2. The broadband chaotic generator without delay characteristics as claimed in claim 1, wherein: the splitting ratio of the first output end to the second output end of the 1x2 optical fiber coupler (3) is 80: 20.
3. the wide-band chaotic generator without delay characteristics as claimed in claim 1 or 2, wherein: the light reflection device (5) is a mirror surface or a grating.
4. The broadband chaotic generator without delay characteristics as claimed in claim 3, wherein: the light reflecting device (5) is replaced by a second semiconductor laser.
5. The device according to claim 4, wherein the wide-band chaotic signal generator comprises: the chirped fiber grating (8) has a dispersion of 2000 ps/nm.
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| CN111555809B (en) * | 2020-03-30 | 2023-02-28 | 太原理工大学 | Photo-generated millimeter wave noise generator |
| CN111900604B (en) * | 2020-07-15 | 2021-07-27 | 太原理工大学 | Hectowatt chaotic laser source device based on random fiber laser |
| CN111900601B (en) * | 2020-07-15 | 2021-07-27 | 太原理工大学 | High-power tunable chaotic laser light source device |
| CN111900603B (en) * | 2020-07-15 | 2021-07-27 | 太原理工大学 | Chaotic laser light source device capable of realizing hectowatt chaotic laser output |
| CN112054380B (en) * | 2020-08-31 | 2021-07-20 | 太原理工大学 | Asymmetric multipath coherent light feedback time-delay-free chaotic laser generation device |
| CN113300772B (en) * | 2021-05-14 | 2022-09-23 | 武汉理工大学 | Multi-wavelength chaotic signal parallel output generation device and method |
| CN114401047B (en) * | 2021-12-24 | 2023-10-20 | 西南交通大学 | Chaotic bandwidth expansion method based on optical fiber modulation instability |
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