A random number generator and a generating method based on crystal resonant cavity light chaos

Abstract

The application relates to the field of optoelectronic technology, and particularly relates to a random number generator based on crystal resonant cavity light chaos and a generating method, which comprises a semiconductor laser, a focusing mirror, a beam splitter-combiner, a reflecting mirror, a first coupling prism, a second coupling prism, a crystal resonant cavity, a first focusing optical fiber, a second focusing optical fiber, a first photoelectric detector, a second photoelectric detector, a signal processing unit and an oscilloscope; the light port of the semiconductor laser is connected with the first port of the beam splitter-combiner through the focusing mirror; the second port of the beam splitter-combiner is connected with the first surface of the first coupling prism; the second surface of the first coupling prism is coupled with the crystal resonant cavity; the third port of the beam splitter-combiner is connected with the first surface of the second coupling prism through the reflecting mirror; and the second surface of the second coupling prism is coupled with the crystal resonant cavity. The application solves the problems of low generation rate and low entropy value of generated random numbers of the existing random number generator, and is suitable for cryptography, communication systems, numerical simulation, statistical analysis and the like.

Description

Technical Field

[0001] This invention relates to the field of optoelectronics technology, specifically a random number generator and generation method based on crystal resonator optical chaos. Background Technology

[0002] A random number generator is a device used to generate random numbers, widely used in cryptography, communication systems, numerical simulation, statistical analysis, and other fields. However, in practical applications, existing random number generators, due to limitations in their underlying principles, suffer from low generation rates and low entropy values ​​in the generated random numbers, thus failing to adequately meet practical application requirements. Therefore, it is necessary to invent a random number generator and generation method based on crystal resonant cavity optical chaos to solve the problems of low generation rates and low entropy values ​​in existing random number generators. Summary of the Invention

[0003] To address the problems of low generation rate and low entropy of generated random numbers in existing random number generators, this invention provides a random number generator and generation method based on crystal resonant cavity optical chaos.

[0004] This invention is achieved using the following technical solution:

[0005] A random number generator based on crystal resonator optical chaos includes a semiconductor laser, a focusing lens, a beam splitter and combiner, a mirror, a first coupling prism, a second coupling prism, a crystal resonator, a first focusing fiber, a second focusing fiber, a first photodetector, a second photodetector, a signal processing unit, and an oscilloscope.

[0006] The optical port of the semiconductor laser is connected to the first port of the beam splitter and combiner via a focusing lens;

[0007] The second port of the beam splitter and combiner is connected to the first face of the first coupling prism; the second face of the first coupling prism is coupled to the crystal resonator; the third face of the first coupling prism is connected to the incident end of the first photodetector through the first focusing fiber; the signal output end of the first photodetector is connected to the signal input end of the signal processing unit and the signal input end of the oscilloscope, respectively.

[0008] The third port of the beam splitter and combiner is connected to the first face of the second coupling prism via a reflector; the second face of the second coupling prism is coupled to the crystal resonator; the third face of the second coupling prism is connected to the incident end of the second photodetector via the second focusing fiber; and the signal output end of the second photodetector is connected to the signal input end of the oscilloscope.

[0009] Furthermore, the signal processing unit includes an analog-to-digital conversion module, a digital signal processing module, and a randomness enhancement algorithm module; the signal input terminal of the analog-to-digital conversion module serves as the signal input terminal of the signal processing unit; the signal output terminal of the analog-to-digital conversion module is connected to the signal input terminal of the digital signal processing module; the signal output terminal of the digital signal processing module is connected to the signal input terminal of the randomness enhancement algorithm module; and the signal output terminal of the randomness enhancement algorithm module serves as the signal output terminal of the signal processing unit.

[0010] Furthermore, it also includes an air-cooled box and a regulated power supply; the semiconductor laser is located inside the air-cooled box; the output terminal of the regulated power supply is connected to the power supply terminal of the air-cooled box and the power supply terminal of the semiconductor laser, respectively.

[0011] Furthermore, the wavelength of the semiconductor laser is 193nm, 450nm, 532nm, 680nm, 808nm, 980nm, 1064nm, 1310nm, or 1550nm; the chip of the semiconductor laser is an FP laser chip, a VCSEL laser chip, or a DFB laser chip; and the material of the crystal resonator is calcium fluoride, magnesium fluoride, aluminum oxide, lithium niobate, or lithium tantalate.

[0012] Furthermore, the crystal resonant cavity is prepared by the following steps: First, the rough surface of the optical crystal material is pre-treated by polishing with a diamond tool to obtain a disk-shaped optical crystal with a thickness of 0.2 mm and a diameter of 7 mm; then, the disk-shaped optical crystal is polished sequentially with polishing paper and polishing fluid with roughnesses of 9 nm, 5 nm, 3 nm, 1 nm, 0.5 nm, 0.3 nm and 0.1 nm, so that the surface roughness of the disk-shaped optical crystal is better than 1 nm and the diameter is 6.6 mm ± 0.1 mm, thereby obtaining the crystal resonant cavity.

[0013] A random number generation method based on crystal resonator optical chaos is disclosed. This method is implemented using a random number generator based on crystal resonator optical chaos as described in this invention, and comprises the following steps:

[0014] First, control the random number generator to enter working mode; the working mode is as follows:

[0015] The light output from the semiconductor laser is focused by a focusing lens and then incident on a beam splitter and combiner. The beam splitter and combiner splits the light into two paths: the first path is incident on a first coupling prism and enters the crystal resonator through evanescent field coupling for forward propagation; the second path is incident on a second coupling prism through a reflecting mirror and enters the crystal resonator through evanescent field coupling for reverse propagation.

[0016] During forward propagation, a portion of the first beam enters the second coupling prism as the first feedback beam, and then passes sequentially through the second coupling prism, a reflector, a beam splitter / combiner, and a focusing mirror before being fed back to the semiconductor laser, thereby interfering with the output light of the semiconductor laser. During reverse propagation, a portion of the second beam enters the first coupling prism as the second feedback beam, and then passes sequentially through the first coupling prism, a beam splitter / combiner, and a focusing mirror before being fed back to the semiconductor laser, thereby interfering with the output light of the semiconductor laser. Under the combined effect of the two feedback beams, the semiconductor laser enters a chaotic state.

[0017] During forward propagation, a portion of the first light source enters the first coupling prism as the first output light, and then passes through the first coupling prism and the first focusing fiber to reach the first photodetector. The photodetector then converts the light into a first electrical signal, which is transmitted to the signal processing unit and the oscilloscope. During reverse propagation, a portion of the second light source enters the second coupling prism as the second output light, and then passes through the second coupling prism and the second focusing fiber to reach the second photodetector. The photodetector then converts the light into a second electrical signal, which is transmitted to the oscilloscope. The signal processing unit processes the first electrical signal to generate a random number. The oscilloscope monitors both electrical signals.

[0018] In the working mode, the intensity of the second feedback light can be adjusted by adjusting the coupling distance between the first coupling prism and the crystal resonator; the intensity of the first feedback light can be adjusted by adjusting the coupling distance between the second coupling prism and the crystal resonator; by adjusting the intensity of the two feedback lights, the frequency detuning between the semiconductor laser and the crystal resonator can be adjusted, thereby adjusting the chaotic state of the semiconductor laser and thus adjusting the entropy value of the random number.

[0019] Furthermore, the signal processing unit's processing of the first electrical signal specifically includes: the analog-to-digital conversion module sampling the first electrical signal, the digital signal processing module quantizing the first electrical signal, and the randomness enhancement algorithm module enhancing the randomness of the first electrical signal.

[0020] Furthermore, in the working mode, the air-cooled box continuously cools the semiconductor laser, and the regulated power supply continuously supplies power to the air-cooled box and the semiconductor laser.

[0021] Furthermore, in the working mode, the coupling spacing can be adjusted by three-dimensional displacement stage adjustment, PZT stress adjustment, thermal adjustment, or electrical adjustment.

[0022] Compared with existing random number generators, the random number generator and generation method based on crystal resonant cavity optical chaos described in this invention achieves efficient and reliable random number generation by adopting a completely new principle. On the one hand, it significantly improves the generation rate, and on the other hand, it significantly improves the entropy value of the generated random numbers, thus well meeting the needs of practical applications.

[0023] This invention effectively solves the problems of low generation rate and low entropy value of generated random numbers in existing random number generators, and is applicable to fields such as cryptography, communication systems, numerical simulation, and statistical analysis. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 yes Figure 1 A partial structural diagram.

[0026] Figure 3 yes Figure 2 The left view.

[0027] Figure 4 This is a schematic diagram of the signal processing unit in this invention.

[0028] In the diagram: 1-Semiconductor laser, 2-Focusing lens, 3-Beam splitter and combiner, 4-Reflector, 5-First coupling prism, 6-Second coupling prism, 7-Crystal resonator, 8-First focusing fiber, 9-Second focusing fiber, 10-First photodetector, 11-Second photodetector, 12-Signal processing unit, 13-Analog-to-digital converter module, 14-Digital signal processing module, 15-Randomness enhancement algorithm module, 16-Oscilloscope, 17-Air-cooled box, 18-Regulated power supply. Detailed Implementation

[0029] A random number generator based on crystal resonator optical chaos includes a semiconductor laser 1, a focusing mirror 2, a beam splitter and beam combiner 3, a reflector 4, a first coupling prism 5, a second coupling prism 6, a crystal resonator 7, a first focusing fiber 8, a second focusing fiber 9, a first photodetector 10, a second photodetector 11, a signal processing unit 12, and an oscilloscope 16.

[0030] The optical port of the semiconductor laser 1 is connected to the first port of the beam splitter and combiner 3 through the focusing mirror 2;

[0031] The second port of the beam splitter and combiner 3 is connected to the first surface of the first coupling prism 5; the second surface of the first coupling prism 5 is coupled to the crystal resonator 7; the third surface of the first coupling prism 5 is connected to the incident end of the first photodetector 10 through the first focusing fiber 8; the signal output end of the first photodetector 10 is connected to the signal input end of the signal processing unit 12 and the signal input end of the oscilloscope 16, respectively.

[0032] The third port of the beam splitter and combiner 3 is connected to the first surface of the second coupling prism 6 through the reflector 4; the second surface of the second coupling prism 6 is coupled to the crystal resonant cavity 7; the third surface of the second coupling prism 6 is connected to the incident end of the second photodetector 11 through the second focusing fiber 9; the signal output end of the second photodetector 11 is connected to the signal input end of the oscilloscope 16.

[0033] The signal processing unit 12 includes an analog-to-digital conversion module 13, a digital signal processing module 14, and a randomness enhancement algorithm module 15. The signal input terminal of the analog-to-digital conversion module 13 serves as the signal input terminal of the signal processing unit 12. The signal output terminal of the analog-to-digital conversion module 13 is connected to the signal input terminal of the digital signal processing module 14. The signal output terminal of the digital signal processing module 14 is connected to the signal input terminal of the randomness enhancement algorithm module 15. The signal output terminal of the randomness enhancement algorithm module 15 serves as the signal output terminal of the signal processing unit 12.

[0034] It also includes an air-cooled box 17 and a regulated power supply 18; the semiconductor laser 1 is located inside the air-cooled box 17; the output terminal of the regulated power supply 18 is connected to the power supply terminal of the air-cooled box 17 and the power supply terminal of the semiconductor laser 1, respectively.

[0035] The wavelength of the semiconductor laser 1 is 193nm, 450nm, 532nm, 680nm, 808nm, 980nm, 1064nm, 1310nm, or 1550nm; the chip of the semiconductor laser 1 is an FP (Fabry-Perot) laser chip, a VCSEL (Vertical-Cavity Surface Emitting Laser) laser chip, or a DFB (Distributed Feedback) laser chip; the material of the crystal resonator 7 is calcium fluoride, magnesium fluoride, aluminum oxide, lithium niobate, or lithium tantalate.

[0036] The crystal resonant cavity 7 is prepared by the following steps: First, the rough surface of the optical crystal material is pre-polished with a diamond tool to obtain a disk-shaped optical crystal with a thickness of 0.2 mm and a diameter of 7 mm; then, the disk-shaped optical crystal is polished sequentially with polishing paper and polishing liquid with roughnesses of 9 nm, 5 nm, 3 nm, 1 nm, 0.5 nm, 0.3 nm and 0.1 nm, so that the surface roughness of the disk-shaped optical crystal is better than 1 nm and the diameter is 6.6 mm ± 0.1 mm, thereby obtaining the crystal resonant cavity 7.

[0037] A random number generation method based on crystal resonator optical chaos is disclosed. This method is implemented using a random number generator based on crystal resonator optical chaos as described in this invention, and comprises the following steps:

[0038] First, control the random number generator to enter working mode; the working mode is as follows:

[0039] The light output from the semiconductor laser 1 is incident on the beam splitter and combiner 3 through the focusing lens 2, and is split into two beams by the beam splitter and combiner 3: the first beam is incident on the first coupling prism 5, and enters the crystal resonator 7 through evanescent field coupling for forward propagation; the second beam is incident on the second coupling prism 6 through the reflecting mirror 4, and enters the crystal resonator 7 through evanescent field coupling for reverse propagation.

[0040] During forward propagation, a portion of the first light path enters the second coupling prism 6 as the first feedback light, and is subsequently fed back to the semiconductor laser 1 via the second coupling prism 6, the reflector 4, the beam splitter and combiner 3, and the focusing mirror 2, thereby interfering with the light output from the semiconductor laser 1. During reverse propagation, a portion of the second light path enters the first coupling prism 5 as the second feedback light, and is subsequently fed back to the semiconductor laser 1 via the first coupling prism 5, the beam splitter and combiner 3, and the focusing mirror 2, thereby interfering with the light output from the semiconductor laser 1. Under the combined effect of the two feedback light paths, the semiconductor laser 1 enters a chaotic state.

[0041] During forward propagation, another portion of the first light path enters the first coupling prism 5 as the first output light, and then passes through the first coupling prism 5 and the first focusing fiber 8 sequentially before being incident on the first photodetector 10. The photodetector 10 then converts the light into a first electrical signal, which is transmitted to the signal processing unit 12 and the oscilloscope 16. During reverse propagation, another portion of the second light path enters the second coupling prism 6 as the second output light, and then passes through the second coupling prism 6 and the second focusing fiber 9 sequentially before being incident on the second photodetector 11. The photodetector 11 then converts the light into a second electrical signal, which is transmitted to the oscilloscope 16. The signal processing unit 12 processes the first electrical signal to generate a random number. The oscilloscope 16 monitors both electrical signals.

[0042] In the operating mode, by adjusting the coupling distance between the first coupling prism 5 and the crystal resonant cavity 7 (e.g., Figure 2 As shown, d 1 The coupling distance between the first coupling prism 5 and the crystal resonant cavity 7 can be used to adjust the intensity of the second feedback light; by adjusting the coupling distance between the second coupling prism 6 and the crystal resonant cavity 7 (e.g., ... Figure 2 As shown, d 2(This represents the coupling distance between the second coupling prism 6 and the crystal resonator 7), which can adjust the intensity of the first feedback light; by adjusting the intensity of the two feedback lights, the frequency detuning between the semiconductor laser 1 and the crystal resonator 7 can be adjusted, thereby adjusting the chaotic state of the semiconductor laser 1, and thus adjusting the entropy value of the random number.

[0043] The signal processing unit 12 processes the first electrical signal in the following ways: the analog-to-digital conversion module 13 samples the first electrical signal, the digital signal processing module 14 quantizes the first electrical signal, and the randomness enhancement algorithm module 15 enhances the randomness of the first electrical signal.

[0044] In the working mode, the air-cooled box 17 continuously cools the semiconductor laser 1, and the regulated power supply 18 continuously supplies power to the air-cooled box 17 and the semiconductor laser 1.

[0045] In the working mode, the coupling gap can be adjusted by three-dimensional displacement stage adjustment, PZT (piezoelectric ceramic actuator) stress adjustment, thermal adjustment, or electrical adjustment.

[0046] In practice, both the first coupling prism 5 and the second coupling prism 6 are coated with antireflective films. The dimensions of the first coupling prism 5, the second coupling prism 6, the crystal resonator 7, the first focusing fiber 8, and the second focusing fiber 9 are all determined according to the actual application requirements.

[0047] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A random number generator based on crystal resonator optical chaos, characterized in that: Includes a semiconductor laser (1), a focusing mirror (2), a beam splitter and combiner (3), a mirror (4), a first coupling prism (5), a second coupling prism (6), a crystal resonator (7), a first focusing fiber (8), a second focusing fiber (9), a first photodetector (10), a second photodetector (11), a signal processing unit (12), and an oscilloscope (16). The optical port of the semiconductor laser (1) is connected to the first port of the beam splitter and combiner (3) through the focusing lens (2); The second port of the beam splitter (3) is connected to the first surface of the first coupling prism (5); the second surface of the first coupling prism (5) is coupled to the crystal resonator (7); the third surface of the first coupling prism (5) is connected to the incident end of the first photodetector (10) through the first focusing fiber (8); the signal output end of the first photodetector (10) is connected to the signal input end of the signal processing unit (12) and the signal input end of the oscilloscope (16) respectively. The third port of the beam splitter (3) is connected to the first surface of the second coupling prism (6) through the reflector (4); the second surface of the second coupling prism (6) is coupled to the crystal resonator (7); the third surface of the second coupling prism (6) is connected to the incident end of the second photodetector (11) through the second focusing fiber (9); the signal output end of the second photodetector (11) is connected to the signal input end of the oscilloscope (16).

2. The random number generator based on crystal resonator optical chaos according to claim 1, characterized in that: The wavelength of the semiconductor laser (1) is 193nm or 450nm or 532nm or 680nm or 808nm or 980nm or 1064nm or 1310nm or 1550nm; the chip of the semiconductor laser (1) is an FP laser chip or a VCSEL laser chip or a DFB laser chip; the material of the crystal resonator (7) is calcium fluoride or magnesium fluoride or aluminum oxide or lithium niobate or lithium tantalate.

3. A random number generator based on crystal resonator optical chaos according to claim 1, characterized in that: The crystal resonator (7) is prepared by the following steps: First, the rough surface of the optical crystal material is pre-polished with a diamond tool to obtain a disk-shaped optical crystal with a thickness of 0.2 mm and a diameter of 7 mm; then, the disk-shaped optical crystal is polished with polishing paper and polishing liquid with roughness of 9 nm, 5 nm, 3 nm, 1 nm, 0.5 nm, 0.3 nm and 0.1 nm respectively, so that the surface roughness of the disk-shaped optical crystal is better than 1 nm and the diameter is 6.6 mm ± 0.1 mm, thereby obtaining the crystal resonator (7).

4. A random number generation method based on crystal resonator optical chaos, wherein the method is implemented based on the random number generator based on crystal resonator optical chaos as described in claim 1, characterized in that: This method is implemented using the following steps: First, control the random number generator to enter working mode; the working mode is as follows: The light output from the semiconductor laser (1) is incident on the beam splitter and combiner (3) through the focusing lens (2), and is split into two beams by the beam splitter and combiner (3): the first beam is incident on the first coupling prism (5) and enters the crystal resonator (7) through evanescent field coupling for forward propagation; the second beam is incident on the second coupling prism (6) through the reflecting mirror (4) and enters the crystal resonator (7) through evanescent field coupling for reverse propagation. During forward propagation, a portion of the first light enters the second coupling prism (6) as the first feedback light, and is fed back to the semiconductor laser (1) in sequence through the second coupling prism (6), the reflector (4), the beam splitter and combiner (3), and the focusing mirror (2), thereby interfering with the light output from the semiconductor laser (1). During the reverse propagation process, a portion of the second light enters the first coupling prism (5) as the second feedback light, and is fed back to the semiconductor laser (1) in sequence through the first coupling prism (5), the beam splitter and combiner (3), and the focusing lens (2), thereby interfering with the light output by the semiconductor laser (1); under the combined action of the two feedback lights, the semiconductor laser (1) enters a chaotic state; During forward propagation, the other part of the first light path enters the first coupling prism (5) as the first output light path, and is incident on the first photodetector (10) through the first coupling prism (5) and the first focusing fiber (8) in sequence. Then, it is converted into the first electrical signal by the first photodetector (10) and transmitted to the signal processing unit (12) and the oscilloscope (16). During reverse propagation, the other part of the second light path enters the second coupling prism (6) as the second output light path, and is incident on the second photodetector (11) through the second coupling prism (6) and the second focusing fiber (9) in sequence. Then, it is converted into the second electrical signal by the second photodetector (11) and transmitted to the oscilloscope (16). The signal processing unit (12) processes the first electrical signal and generates a random number. The oscilloscope (16) monitors the two electrical signals. In the working mode, the intensity of the second feedback light can be adjusted by adjusting the coupling distance between the first coupling prism (5) and the crystal resonator (7); the intensity of the first feedback light can be adjusted by adjusting the coupling distance between the second coupling prism (6) and the crystal resonator (7); by adjusting the intensity of the two feedback lights, the frequency detuning between the semiconductor laser (1) and the crystal resonator (7) can be adjusted, thereby adjusting the chaotic state of the semiconductor laser (1) and thus adjusting the entropy value of the random number.

5. The random number generation method based on crystal resonator optical chaos according to claim 4, characterized in that: The signal processing unit (12) includes an analog-to-digital conversion module (13), a digital signal processing module (14), and a randomness enhancement algorithm module (15); the signal input terminal of the analog-to-digital conversion module (13) serves as the signal input terminal of the signal processing unit (12); the signal output terminal of the analog-to-digital conversion module (13) is connected to the signal input terminal of the digital signal processing module (14); the signal output terminal of the digital signal processing module (14) is connected to the signal input terminal of the randomness enhancement algorithm module (15); and the signal output terminal of the randomness enhancement algorithm module (15) serves as the signal output terminal of the signal processing unit (12). The signal processing unit (12) processes the first electrical signal in the following ways: the analog-to-digital conversion module (13) samples the first electrical signal, the digital signal processing module (14) quantizes the first electrical signal, and the randomness enhancement algorithm module (15) enhances the randomness of the first electrical signal.

6. The random number generation method based on crystal resonator optical chaos according to claim 4, characterized in that: The random number generator based on crystal resonator optical chaos also includes a cooling box (17) and a regulated power supply (18); the semiconductor laser (1) is located inside the cooling box (17); the output terminal of the regulated power supply (18) is connected to the power supply terminal of the cooling box (17) and the power supply terminal of the semiconductor laser (1), respectively. In the working mode, the air-cooled box (17) continuously cools the semiconductor laser (1), and the regulated power supply (18) continuously supplies power to the air-cooled box (17) and the semiconductor laser (1).

7. The random number generation method based on crystal resonator optical chaos according to claim 4, characterized in that: In the working mode, the coupling gap can be adjusted by three-dimensional displacement stage adjustment, PZT stress adjustment, thermal adjustment, or electrical adjustment.

Images