Broadband low-delay chaotic laser generation device and method based on dual-path light injection

Abstract

The present invention belongs to the field of chaotic laser technology and discloses a broadband, low-latency chaotic laser generation device and method based on dual-path light injection. In the device, the laser light output by the first laser passes through the first light guide device and is split into two beams by the first beam splitter, which are then used as injection light and feedback light respectively. The feedback light passes through the optical bandpass filter, the first polarization controller, the first attenuation controller, and the first light guide device in sequence and then returns to the first laser to output chaotic laser light. The injection light is split into two beams by the second beam splitter. The two injection light beams pass through the second attenuation controller and the third attenuation controller respectively and are incident on the beam combiner. The two beams after passing through the beam combiner are combined together and injected into the second laser after passing through the second light guide device and the second polarization controller in sequence to generate chaotic laser light. The present invention utilizes the mutual coupling of asymmetric injection signals, the mixing effect and the chaotic filtering effect to enhance the bandwidth and suppress the delay characteristics, and is suitable for communication, sensing, information security and other fields.

Description

Technical Field

[0001] The present invention belongs to the field of chaotic laser technology, specifically a broadband low-delay chaotic laser generating device and method based on dual-path light injection, which is applicable to optical communication, sensing, information security and other fields. Background Art

[0002] Chaotic lasers, a novel laser technology, generate complex chaotic beams with properties such as higher energy and a wider spectral range. In recent years, chaotic laser technology has made significant progress and has been widely applied in many fields. For example, chaotic lasers can be used in optical communications, optical computing, optical sensing, and high-speed random number generation. Semiconductor lasers, due to their low cost, small footprint, and susceptibility to external interference, have become the preferred light source for generating chaotic lasers. The main methods for generating chaotic lasers using semiconductor lasers include optical feedback, optical injection, and photoelectric feedback. However, due to the inherent relaxation oscillations of semiconductor lasers and the limitations of chaos generation methods, the resulting chaotic lasers have a bandwidth of only a few GHz and are accompanied by periodic oscillation signals. The narrow bandwidth and weak periodicity of chaotic signals severely restrict their application and industrialization. For example, the chaotic carrier significantly limits the information transmission rate, making it inadequate for high-speed fiber-optic communications. The weak periodicity can provide eavesdroppers with opportunities to extract key parameters, posing a significant security and confidentiality risk. It will also restrict the code rate and randomness of random numbers, affect the statistical performance of random bit sequences in high-speed random number generators, and the spatial resolution of chaotic radar and fiber optic sensing systems.

[0003] To address these issues, researchers have proposed various methods for generating broadband, low-latency chaotic lasers. It has been demonstrated that random optical feedback, cascaded optical injection, and cross-injection methods can enhance the bandwidth and suppress the latency of chaotic lasers. However, these schemes can only achieve the characteristics of chaotic lasers within a limited parameter range. In most cases, the power spectrum of chaotic lasers generated by optical injection is uneven, and the low-frequency components have low energy, which reduces the efficiency of chaotic lasers. Furthermore, optical injection methods can easily cause the master and slave lasers to enter a state of injection locking.

[0004] Some researchers tend to use novel optical feedback methods that are easy to generate chaotic lasers to increase bandwidth. In 2020, Chang et al. used a discrete mode laser under optical feedback to obtain a flat broadband chaotic laser (Optical Express, 2020, 28(26): 39076-39082); in 2020, Jiang Ning et al. from the University of Electronic Science and Technology of China proved that semiconductor lasers can also generate broadband chaos under the feedback of parallel coupled ring resonators (Optical Express, 2020, 28(2): 1999-2009). In 2022, Wang Anbang et al. from Taiyuan University of Technology proposed that semiconductor lasers can generate chaotic lasers with suppressed delay characteristics under band-stop optical feedback (IEEE Photonics Journal, 2022, 14(2)). In 2022, Robbe et al. proved that semiconductor lasers with phase-controlled dual optical feedback can generate chaotic lasers with suppressed chaotic delay characteristics (Optics Continuum, 2022, 1(10): 2127-2134). However, the experimental setup of the above scheme is complex, the generated chaotic laser bandwidth is limited, the time delay feature suppression is not obvious, and the available parameter range is relatively limited. Summary of the Invention

[0005] The present invention aims to solve the problems of narrow bandwidth and obvious delay characteristics of chaotic lasers generated by existing optical feedback structures, and proposes a broadband and low-delay chaotic laser generation device and method based on dual-path light injection to improve the bandwidth and delay performance of chaotic lasers.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a broadband low-delay chaotic laser generating device based on dual-path light injection, comprising: a first laser, a first light guide device, a first beam splitter, an optical bandpass filter, a first polarization controller, a first attenuation controller, a second beam splitter, a second attenuation controller, a second attenuation controller, a beam combiner, a second light guide device, a second polarization controller and a second laser;

[0007] The laser output by the first laser passes through the first light guide device and is split into two beams by the first beam splitter and then used as injection light and feedback light respectively. The feedback light passes through the optical bandpass filter, the first polarization controller, the first attenuation controller, and the first light guide device in sequence and then returns to the first laser to make it output chaotic laser; the injection light is split into two beams by the second beam splitter, and the two injection light beams are incident on the beam combiner after passing through the second attenuation controller and the third attenuation controller respectively. The two beams after passing through the beam combiner are merged together and are injected into the second laser after passing through the second light guide device and the second polarization controller in sequence to generate chaotic laser. The chaotic laser generated by the second laser is output after passing through the second polarization controller and the second light guide device in sequence.

[0008] The broadband low-delay chaotic laser generating device based on dual-path light injection further includes an optical amplifier, which is arranged between the first beam splitter and the optical bandpass filter and is used to amplify the feedback light output by the first beam splitter.

[0009] The first light guide device and the second light guide device are optical circulators, the first port of the first light guide device is connected to the output end of the first laser, the second port is connected to the input end of the first beam splitter, and the third port is connected to the output end of the first attenuation controller; the first port of the second light guide device is connected to the output end of the beam combiner, the second port is connected to the second polarization controller, and the third port serves as the chaotic laser output port.

[0010] The first port of the first light guide device is connected to the output end of the first laser through a single-mode optical fiber jumper, the second port is connected to the input end of the first beam splitter through a single-mode optical fiber jumper, and the third port is connected to the output end of the first attenuation controller through a single-mode optical fiber jumper;

[0011] The first beam splitter, optical amplifier, tunable optical bandpass filter, first polarization controller and first attenuation controller are connected through a single-mode optical fiber jumper, and the first beam splitter, second beam splitter, second attenuation controller, third attenuation controller, combiner, second light guide device and second polarization controller are connected through a single-mode optical fiber jumper.

[0012] The first light guide component and the second light guide component are 45° beam splitters.

[0013] The first beam splitter, the second beam splitter and the beam combiner are all 1×2 optical fiber couplers.

[0014] The optical bandpass filter is a tunable optical bandpass filter, which is used to adjust the frequency detuning amount of the feedback light.

[0015] In addition, the present invention also provides a broadband low-delay chaotic laser generation method based on dual-path light injection, which is implemented based on the broadband low-delay chaotic laser generation device based on dual-path light injection, and includes the following steps:

[0016] S1: controlling the polarization state and intensity of the feedback light by a first polarization controller and a first attenuation controller, respectively, so that the first laser outputs chaotic laser;

[0017] S2: adjusting the intensity of the corresponding injected light through the second attenuation controller or the third attenuation controller, and at the same time, adjusting the frequency detuning of the injected light relative to the second laser, thereby adjusting the bandwidth and delay of the chaotic laser output by the second laser.

[0018] In step S2, the frequency detuning of the injected light relative to the second laser is adjusted by adjusting the temperature of the second laser.

[0019] The frequency detuning amount of the injected light relative to the second laser is between -33.0 GHz and 9.0 GHz.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention proposes a broadband, low-delay chaotic laser generation device and method based on dual-path optical injection. By connecting a tunable optical filter to the feedback path of the first laser, the beat frequency effect of the laser's main mode and filter mode is utilized to cause the first laser to generate a chaotic laser with enhanced bandwidth. Then, an asymmetric dual-path optical injection structure is used to inject the chaotic laser into the second laser through an asymmetric dual path. The asymmetric dual-path optical injection forms an unbalanced Mach-Zehnder interferometer. After delayed self-interference, the chaotic laser generated by the optical feedback structure has its delay characteristics suppressed, the low-frequency component energy is increased, and the bandwidth is enhanced. Therefore, the present invention utilizes the beat frequency effect and chaotic filtering effect of the two laser modes to further enhance the bandwidth of the chaotic laser and suppress the delay characteristics.

[0022] 2. Compared with traditional optical feedback and optical injection structures, the present invention connects an optical amplifier in the feedback path to form active optical feedback, which can increase the feedback intensity to several times the laser's own output. As the feedback intensity increases, the spectrum of the chaotic laser is broadened. An attenuation controller is set in the injection optical path to form an asymmetric optical injection path, so that chaotic signals of different intensities are coupled with each other, and the delay characteristics of the chaotic laser are suppressed.

[0023] 3. The present invention ultimately produces a broadband, low-latency chaotic laser with a standard bandwidth of 36.3 GHz and a delay characteristic secondary peak of 0.031. This broadband, low-latency chaotic laser can be achieved over a wide parameter range. This is difficult to achieve with existing optical feedback structures. Therefore, the present invention can expand the bandwidth of chaotic lasers, suppress delay characteristics, and has a reasonable design, making it highly valuable for widespread application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a broadband low-delay chaotic laser generating device based on dual-path light injection provided in Example 1 of the present invention;

[0025] In the figure: 1-first laser, 2-first light guide device, 3-first beam splitter, 4-optical amplifier, 5-optical bandpass filter, 6-first polarization controller, 7-first attenuation controller, 8-second beam splitter, 9-second attenuation controller, 10-third attenuation controller, 11-beam combiner, 12-second light guide device, 13-second polarization controller, 14-second laser;

[0026] Figure 2The spectrum and autocorrelation curves of the broadband low-delay chaotic laser obtained in an embodiment of the present invention are shown. The light gray curve represents the noise floor, the dark gray curve represents the chaotic laser generated by single feedback, and the black curve represents the broadband low-delay chaotic laser with a standard bandwidth of 36.3 GHz and a delay characteristic secondary peak of 0.031, generated based on the asymmetric dual-path light injection structure.

[0027] Figure 3 This is a dynamic distribution diagram of the chaotic laser bandwidth and delay characteristics generated under different filter frequency detuning and filter feedback intensities obtained in an embodiment of the present invention. The horizontal axis represents the frequency detuning between the optical bandpass filter and the first laser, and the vertical axis represents the feedback light intensity. Different grayscales represent the magnitude of the generated chaotic laser bandwidth and delay characteristics. The contour line with a chaotic bandwidth of 29.0 GHz and a contour line with a delay characteristic secondary peak of 0.09 are marked in the figure.

[0028] Figure 4 This is a dynamic distribution diagram of the chaotic laser bandwidth and delay characteristics generated under different laser frequency detuning and second injection light intensities obtained in an embodiment of the present invention. The horizontal axis represents the frequency detuning between the lasers, and the vertical axis represents the intensity of one of the injection light beams. Different grayscales represent the size of the generated chaotic laser bandwidth and delay characteristics. The figure marks the contour lines with chaotic bandwidths of 30.0 GHz and 34.0 GHz, respectively, and the contour lines with delay characteristic secondary peaks of 0.13 and 0.05. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1 As shown, an embodiment of the present invention provides a broadband low-delay chaotic laser generating device based on dual-path light injection, comprising: a first laser 1, a first light guide device 2, a first beam splitter 3, an optical bandpass filter 5, a first polarization controller 6, a first attenuation controller 7, a second beam splitter 8, a second attenuation controller 9, a third attenuation controller 10, a beam combiner 11, a second light guide device 12, a second polarization controller 13, and a second laser 14;

[0032] The laser output by the first laser 1 passes through the first light guide device 2 and is split into two beams by the first beam splitter 3 and used as injection light and feedback light respectively. The feedback light passes through the optical bandpass filter 5, the first polarization controller 6, the first attenuation controller 7, and the first light guide device 2 in sequence and returns to the first laser 1 to make it output chaotic laser; the injection light is split into two beams by the second beam splitter 8, and the two injection light beams are incident on the beam combiner 11 after passing through the second attenuation controller 9 and the third attenuation controller 10 respectively. The two beams after passing through the beam combiner 11 are merged together and injected into the second laser 14 after passing through the second light guide device 12 and the second polarization controller 13 in sequence to generate chaotic laser. The chaotic laser generated by the second laser 14 is output after passing through the second polarization controller 13 and the second light guide device 12 in sequence.

[0033] Furthermore, in this embodiment, the first light guide device 2 and the second light guide device 12 are optical circulators, the first port of the first light guide device 2 is connected to the output end of the first laser 1, the second port is connected to the input end of the first beam splitter 3, and the third port is connected to the output end of the first attenuation controller 7; the first port of the second light guide device 12 is connected to the output end of the combiner 11, the second port is connected to the second polarization controller 13, and the third port serves as the chaotic laser output port.

[0034] Furthermore, in this embodiment, the first port of the first light guiding device 2 is connected to the output end of the first laser 1 through a single-mode optical fiber jumper, the second port is connected to the input end of the first beam splitter 3 through a single-mode optical fiber jumper, and the third port is connected to the output end of the first attenuation controller 7 through a single-mode optical fiber jumper; the first beam splitter 3, the optical amplifier 4, the optical bandpass filter 5, the first polarization controller 6 and the first attenuation controller 7 are connected through a single-mode optical fiber jumper, and the first beam splitter 3, the second beam splitter 8, the second attenuation controller 9, the third attenuation controller 10, the combiner 11, the second light guiding device 12 and the second polarization controller 13 are connected through a single-mode optical fiber jumper.

[0035] Furthermore, in this embodiment, the first beam splitter 3, the second beam splitter 8, and the beam combiner 11 are all 1×2 fiber couplers. The optical bandpass filter 5 is a tunable optical bandpass filter for adjusting the frequency detuning of the feedback light. The tunable optical bandpass filter model may be EXFO XMT-50. The first laser 1 and the second laser 14 may be semiconductor lasers or other types of lasers.

[0036] Furthermore, in this embodiment, the first light guide device 2 and the second light guide device 12 may also be 45° beam splitters. Those skilled in the art are fully aware of how to achieve the laser output of the first laser 1 and the input of feedback light, as well as the input of injection light and the output of laser light of the second laser, through beam splitters. Therefore, detailed description thereof is omitted here.

[0037] Furthermore, the broadband, low-delay chaotic laser generating device based on dual-path light injection in this embodiment also includes an optical amplifier 4, which is arranged between the first beam splitter 3 and the optical bandpass filter 5, and is used to amplify the feedback light output by the first beam splitter 3 to meet the chaotic injection power of the first laser 1.

[0038] The operating principle of this embodiment is as follows: After the feedback light passes through the optical bandpass filter 5 to generate a filter mode, it is then controlled by the first polarization controller 6 and the first attenuation controller 7 for feedback intensity and polarization before being coupled into the first optical circulator 2. Finally, it returns to the first laser 1 to form filter feedback, perturbing the laser main mode to generate chaotic laser light, causing the laser main mode spectrum to be broadened and the frequency components to increase. The first injection light, after having its injection intensity controlled by the second attenuation controller 9, is coupled through the combiner 11 into the second optical circulator 12. The second injection light, after having its injection intensity controlled by the third attenuation controller 10, passes through the combiner 11 and the second optical circulator 12, and after having its polarization controlled by the second polarization controller 13, is injected into the second laser 14, forming asymmetric light injection. The interaction range between the filter mode and the main mode of the first laser 1 is increased, and the beat frequency effect between the two is utilized to generate high-frequency periodic oscillations. Through the mutual coupling of the asymmetric injection paths, the perturbation generates a high-dimensional chaotic signal, suppressing the delay characteristics. The interaction between the filter mode of the first laser 1 and the main mode of the second laser 14, this periodic oscillation and the laser relaxation oscillation generate nonlinear mixing, ultimately producing broadband, low-delay chaotic laser light. In this embodiment, asymmetric dual-path light injection forms an unbalanced Mach-Zehnder interferometer. The chaotic laser generated by the optical feedback structure undergoes delayed self-interference, suppressing its delay characteristics, boosting the energy of its low-frequency components, and enhancing its bandwidth.

[0039] In this embodiment, the optical bandpass filter 5 in the feedback optical path itself has an optical frequency, which forms a beat frequency effect with the corresponding frequency of the first laser, so that the bandwidth of the chaotic signal generated by the first laser is increased by 2 to 3 times compared with the chaotic signal without the optical bandpass filter.

[0040] like Figure 2As shown, the spectrum diagram and autocorrelation curve diagram of the broadband low-delay chaotic laser obtained in Example 1 of the present invention, the first laser 1 and the second laser 14 used are semiconductor lasers. Among them, the light gray curve represents the noise floor. The ratio of the feedback light power of the first laser 1 under fixed bias current and temperature conditions to the free-running output light power is defined as the feedback intensity, the ratio of the injection light power of the second laser 14 under fixed bias current and temperature conditions to the free-running output light power is defined as the injection intensity, and the center frequency difference of the free-running output spectra of the first laser 1 and the second laser 14 under different temperature conditions is defined as the laser frequency detuning. In this embodiment, the feedback intensity of the filter feedback path is always fixed at 0.64. When the injection intensity is set to 0 and directly output from the first beam splitter 3, the feedback path can be used as a filtered single-light feedback structure. At this time, the spectrum and autocorrelation curve of the chaotic laser are as shown below. Figure 2 The medium-dark gray curve shows the chaotic output state of periodic oscillation, with a bandwidth of 14.3 GHz and a delay characteristic secondary peak of 0.38. The black curve represents the broadband, low-latency chaotic laser generated using the dual-path optical injection structure of this embodiment. In this case, the filter frequency detuning is 30.1 GHz, the laser frequency detuning is -27.3 GHz, and the first injection intensity of the injection path is 0.14, and the second injection intensity is 10.14. It can be seen that the bandwidth of the broadband, low-latency chaotic laser is significantly enhanced, and the delay characteristics are hidden in the noise. In this case, the chaotic bandwidth is 36.3 GHz, and the delay characteristic secondary peak is 0.031.

[0041] Example 2

[0042] A second embodiment of the present invention provides a method for generating a broadband low-latency chaotic laser based on dual-path light injection, which is implemented based on the broadband low-latency chaotic laser generating device based on dual-path light injection described in the first embodiment, and includes the following steps:

[0043] S1: Controlling the polarization state and intensity of the feedback light by the first polarization controller 6 and the first attenuation controller 7 respectively, so that the first laser 1 outputs chaotic laser;

[0044] S2: The intensity of the corresponding injected light is adjusted by the second attenuation controller 9 or the third attenuation controller 10. At the same time, the frequency detuning of the injected light relative to the second laser 14 is adjusted, thereby adjusting the bandwidth and delay of the chaotic laser output by the second laser 14.

[0045] In step S2 , the frequency detuning amount of the injected light relative to the second laser 14 is adjusted by adjusting the temperature of the second laser 14 .

[0046] Specifically, in this embodiment, the frequency detuning amount of the injected light relative to the second laser 14 is between -33.0 GHz and 9.0 GHz.

[0047] By setting the optical bandpass filter 5 as a tunable optical bandpass filter 5, the tunable optical bandpass filter 5 is used to adjust the filter frequency detuning (the frequency detuning of the feedback light relative to the first laser), and the first attenuation controller 7 is used to adjust the intensity of the feedback light, and the effects of the filter frequency detuning and the filter feedback intensity on the bandwidth and delay characteristics of the generated chaotic laser are explored.

[0048] like Figure 3 Figure 2 shows the dynamic distribution of chaotic laser bandwidth and delay characteristics generated under different filter frequency detuning and filter feedback intensities, as obtained in Example 2 of the present invention. Different grayscales represent the magnitude of the chaotic laser bandwidth and delay characteristics. The figure marks the contour line with a chaotic bandwidth of 29.0 GHz and the contour line with a delay characteristic secondary peak of 0.09. Research has found that when the filter frequency detuning varies from -30.0 GHz to 30.0 GHz, the chaotic laser bandwidth and delay characteristics remain essentially unchanged. The reason for the minimal effect is that when the detuning between the laser's main mode and the filter mode is large, the feedback light cannot effectively perturb the laser's cavity, limiting the range of interaction. When the filter feedback intensity varies from 0.14 to 0.95, the chaotic laser bandwidth first increases, then remains essentially unchanged, and finally decreases, while the delay characteristics exhibit the opposite effect. When the filter feedback intensity is between 0.5 and 0.9, the chaotic bandwidth exceeds 29 GHz, and the delay characteristic secondary peak is below 0.1, resulting in simultaneous improvement in the chaotic bandwidth and delay characteristics over a wide range. The study also found that as the filter frequency detuning continues to change, the chaotic bandwidth and delay characteristics tend to change smoothly. The study also found that as the filter feedback intensity increases, the chaotic laser bandwidth first increases, then tends to flatten out, and the delay characteristics gradually decrease. When the filter feedback intensity changes from 0 to 0.23, the bandwidth slowly increases due to relaxation oscillations, and the delay characteristics become obvious. When the filter feedback intensity changes from 0.23 to 0.5, due to the continuous increase in the energy of the low-frequency component, the bandwidth increases and the delay characteristics begin to decrease. After the feedback intensity reaches 0.5, the delay characteristics change gradually, fluctuating around 0.08.

[0049] By fixing the temperature of the first laser and changing the temperature of the second laser to shift its spectral center frequency, the laser frequency detuning is adjusted. The intensity of one of the injected lights is adjusted through the attenuation controller to explore the effects of the laser frequency detuning and the intensity of the second injected light on the bandwidth and delay characteristics of the generated chaotic laser.

[0050] like Figure 4As shown in the figure, the dynamic distribution diagram of the chaotic laser bandwidth and delay characteristics generated under different laser frequency detuning and second injection light intensities obtained in Example 2 of the present invention is shown. In particular, different grayscales are used to represent the size of the chaotic laser bandwidth and delay characteristics generated. The figure marks the contour lines with chaotic bandwidths of 30.0 GHz and 34.0 GHz, respectively, and the contour lines with delay characteristic secondary peaks of 0.13 and 0.05. The study found that when the frequency detuning of the two lasers changes from -33.0 GHz to 9.0 GHz, the chaotic laser bandwidth first decreases, then increases, and finally decreases again, while the delay characteristic shows a trend of gradual increase. When the laser frequency detuning is between -33.0 GHz and -24.4 GHz, the chaotic bandwidth exceeds 30 GHz, and the delay characteristic secondary peak is below 0.1, and the chaotic bandwidth and delay characteristics are simultaneously improved. The study also found that as the laser frequency detuning changes to negative frequency detuning, the chaotic bandwidth continues to increase and the delay characteristic secondary peak decreases. As the laser frequency detuning increases from -18.0 GHz to -33.0 GHz, the chaotic laser bandwidth increases and the delay characteristics decrease due to the increasing beat frequency effect between the lasers and the mutual coupling of asymmetric signals. When the laser frequency detuning reaches -30.0 GHz, the chaotic laser bandwidth exceeds 33 GHz, and the secondary peak of the delay characteristic fluctuates around 0.05. The study also found that with the increase of the second injection light intensity, the chaotic laser bandwidth and delay characteristics change gradually.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broadband low-delay chaotic laser generator based on dual-path light injection, characterized in that: include: A first laser (1), a first light guide device (2), a first beam splitter (3), an optical bandpass filter (5), a first polarization controller (6), a first attenuation controller (7), a second beam splitter (8), a second attenuation controller (9), a third attenuation controller (10), a beam combiner (11), a second light guide device (12), a second polarization controller (13), and a second laser (14); The laser light output by the first laser (1) passes through the first light guide device (2) and is then split into two beams by the first beam splitter (3) and used as injection light and feedback light respectively. The feedback light passes through the optical bandpass filter (5), the first polarization controller (6), the first attenuation controller (7), and the first light guide device (2) in sequence and then returns to the first laser (1) to output chaotic laser light. The injection light is split into two beams by the second beam splitter (8). The two injection light beams pass through the second attenuation controller (9) and the third attenuation controller (10) respectively and then enter the beam combiner (11). The two light beams after passing through the beam combiner (11) are combined together and passed through the second light guide device (12) and the second polarization controller (13) in sequence and then injected into the second laser (14) to generate chaotic laser light. The chaotic laser light generated by the second laser (14) passes through the second polarization controller (13) and the second light guide device (12) in sequence and then is output.

2. A broadband low-delay chaotic laser generator based on dual-path light injection according to claim 1, characterized in that: It also includes an optical amplifier (4), which is arranged between the first beam splitter (3) and the optical bandpass filter (5) and is used to amplify the feedback light output by the first beam splitter (3).

3. The broadband low-delay chaotic laser generator based on dual-path light injection according to claim 1, characterized in that: The first light guide device (2) and the second light guide device (12) are optical circulators; the first port of the first light guide device (2) is connected to the output end of the first laser (1), the second port is connected to the input end of the first beam splitter (3), and the third port is connected to the output end of the first attenuation controller (7); the first port of the second light guide device (12) is connected to the output end of the beam combiner (11), the second port is connected to the second polarization controller (13), and the third port serves as a chaotic laser output port.

4. A broadband low-delay chaotic laser generating device based on dual-path light injection according to claim 3, characterized in that: The first port of the first light guide device (2) is connected to the output end of the first laser (1) through a single-mode optical fiber jumper, the second port is connected to the input end of the first beam splitter (3) through a single-mode optical fiber jumper, and the third port is connected to the output end of the first attenuation controller (7) through a single-mode optical fiber jumper; The first beam splitter (3), the optical amplifier (4), the tunable optical bandpass filter (5), the first polarization controller (6) and the first attenuation controller (7) are connected via a single-mode optical fiber jumper, and the first beam splitter (3), the second beam splitter (8), the second attenuation controller (9), the third attenuation controller (10), the beam combiner (11), the second light guide device (12) and the second polarization controller (13) are connected via a single-mode optical fiber jumper.

5. The broadband low-delay chaotic laser generating device based on dual-path light injection according to claim 1, characterized in that: The first light guide device (2) and the second light guide device (12) are 45° beam splitters.

6. The broadband low-delay chaotic laser generating device based on dual-path light injection according to claim 1, characterized in that: The first beam splitter (3), the second beam splitter (8), and the beam combiner (11) are all 1×2 optical fiber couplers.

7. The broadband low-delay chaotic laser generating device based on dual-path light injection according to claim 1, characterized in that: The optical bandpass filter (5) is a tunable optical bandpass filter, and is used to adjust the frequency detuning amount of the feedback light.

8. A broadband low-delay chaotic laser generation method based on dual-path light injection, characterized in that: The broadband low-delay chaotic laser generating device based on dual-path light injection according to claim 1 is implemented, comprising the following steps: S1: controlling the polarization state and intensity of the feedback light respectively through a first polarization controller (6) and a first attenuation controller (7), so that the first laser (1) outputs chaotic laser light; S2: The intensity of the corresponding injected light is adjusted by the second attenuation controller (9) or the third attenuation controller (10), and at the same time, the frequency detuning amount of the injected light relative to the second laser (14) is adjusted, thereby adjusting the bandwidth and delay of the chaotic laser output by the second laser (14).

9. The method for generating broadband low-delay chaotic laser based on dual-path light injection according to claim 8, characterized in that: In the step S2, the frequency detuning amount of the injected light relative to the second laser (14) is adjusted by adjusting the temperature of the second laser (14).

10. The method for generating broadband low-delay chaotic laser based on dual-path light injection according to claim 8, characterized in that: The frequency detuning amount of the injected light relative to the second laser (14) is between -33.0 GHz and 9.0 GHz.

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