CN109244801B - Tunable optoelectronic oscillator and method based on random Brillouin fiber laser - Google Patents

Abstract

The disclosure provides tunable ultra-narrow linewidth optoelectronic oscillators based on random Brillouin fiber lasers, which comprise tunable lasers (1), second tunable lasers (2), couplers (3), beam splitters (4), intensity modulators (5), erbium-doped fiber amplifiers (6), circulators (7), high nonlinear fibers (8), second circulators (9), single mode fibers (10), photodetectors (11), power dividers (12) and phase-locked loop systems (13), wherein instant feedback systems are formed, so that two beams of laser emitted by the two tunable lasers have fixed and stable phase difference.

Description

Tunable optoelectronic oscillator and method based on random Brillouin fiber laser

technical field

The present disclosure relates to the technical field of microwave photonics, and in particular, to a tunable ultra-narrow linewidth optoelectronic oscillator and method based on a random Brillouin fiber laser.

Background technique

High-quality microwave sources are widely used in many fields, such as in the communications industry, phased array radar systems, long-range distributed antennas, and so on. Among them, the method of microwave photonics to generate microwave signals has the advantages of large bandwidth and low phase noise. One of the methods to directly generate microwave signals is the optical heterodyne method, which uses the beat frequency of two laser beams with the frequency difference we need to generate microwaves. In this method, the linewidth and frequency drift of the two laser beams will be directly reflected on the generated microwave signal. Another method is to use an optoelectronic oscillator to generate a microwave signal. The optoelectronic oscillator can generate high frequency and high Q value. , Low phase noise and high quality signal, it is a very ideal signal generating device. A method for generating microwave signals based on random Brillouin fiber lasers has been proposed before. This method can generate microwave signals with extremely narrow linewidths (3dB bandwidth is less than 10Hz), but based on the instability of stimulated Brillouin scattering, The generated microwave signal also has extremely unstable characteristics, and it is difficult to obtain specific applications.

In order to realize an extremely narrow and stable tunable microwave source, the present invention proposes a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser. By introducing a random Brillouin fiber laser into the traditional optoelectronic oscillator , generating a tunable microwave signal with extremely narrow linewidth and good stability.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

The present disclosure provides a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser and a method to at least partially solve the above technical problems.

(2) Technical solutions

According to one aspect of the present disclosure, a tunable ultra-narrow linewidth optoelectronic oscillator based on random Brillouin fiber laser is provided, comprising: a first tunable laser, a second tunable laser, a coupler, a beam splitter, The intensity modulator, erbium-doped fiber amplifier, first circulator, highly nonlinear fiber, second circulator, single-mode fiber, photodetector, power divider, and phase-locked loop system form an instant feedback system that enables two The two laser beams emitted by the tunable laser have a fixed and stable phase difference;

The first tunable laser is connected to the first input end of the coupler, the output end of the second tunable laser is connected to the second input end of the coupler, the output end of the coupler is connected to the input end of the beam splitter, and the first The output end is connected to the input end of the phase-locked loop system, and the output end of the phase-locked loop system is connected to the second tunable laser; the second output end of the beam splitter is connected to the input end of the intensity modulator, and the output end of the intensity modulator is connected to the erbium-doped fiber The input end of the amplifier, the output end of the erbium-doped fiber amplifier is connected to the input end of the first circulator, the first output end of the first circulator is connected to the first input end of the second circulator, and the second output end is connected to the first input end of the high nonlinear fiber. one end, and the second end of the high nonlinear fiber is connected to the second input end of the second circulator, the output end of the second circulator is connected to the first end of the single-mode fiber, and the second end of the single-mode fiber is connected to the input end of the photodetector, The output end of the photodetector is connected to the input end of the power divider, the first output end of the power divider is connected to the spectrum analyzer, and the second output end is connected to the intensity modulator, thereby forming a photoelectric oscillation loop.

In some embodiments, by adjusting the wavelength difference between the first tunable laser and the second tunable laser, the optoelectronic oscillator system can generate a microwave signal with a very narrow linewidth and good stability.

In some embodiments, a first tunable laser, a second tunable laser, a coupler, a beam splitter, an intensity modulator, an erbium-doped fiber amplifier, a first circulator, a second circulator, a highly nonlinear light, a single The mode fiber and photodetector are connected by optical fiber, and the beam splitter and the phase-locked loop system are connected by optical fiber; the photodetector, power divider, and intensity modulator are connected by cable, and the phase-locked loop system and the tunable The lasers are connected by cables.

In some embodiments, a first tunable laser, a second tunable laser, a coupler, an intensity modulator, an erbium-doped fiber amplifier, a first circulator, a second circulator, a highly nonlinear fiber, a single-mode fiber, A random Brillouin fiber laser, whose center wavelength is determined by the center wavelength of the first tunable laser and the second tunable laser, can emit laser light with extremely narrow linewidth.

In some embodiments, the first tunable laser and the second tunable laser are semiconductor lasers whose wavelengths can be tuned in rapid succession.

In some embodiments, the high nonlinearity fiber is a high-Q microwave energy storage element with optical nonlinearity, the length of which is hundreds of meters to tens of kilometers.

In some embodiments, the single-mode fiber is a low-loss feedback element with a length of several kilometers to tens of kilometers.

In some embodiments, the dispersion of the optoelectronic oscillator loop is controlled to zero so that signals of different frequencies have the same delay in the loop.

In some embodiments, the phase-locked loop system is used to control and ensure that the optical signals emitted by the first tunable laser and the second tunable laser have a stable phase difference.

According to another aspect of the present disclosure, there is provided a method for using the tunable ultra-narrow linewidth optoelectronic oscillator based on random Brillouin fiber laser, comprising: the first tunable laser and the second tunable laser emit light Two laser beams with a specific frequency difference are coupled into one through the coupler, and then divided into two through the beam splitter, one of the laser beams enters the phase-locked loop system and is immediately fed back to the second tunable laser, so that the first There is a fixed phase difference between the lasers emitted by the tunable laser and the second tunable laser, and the other one enters the intensity modulator and is modulated by the microwave signal generated by the beat frequency, resulting in two laser beams whose frequency difference is equal to the frequency difference between the two laser beams. Positive first-order sideband; the modulated two beams of optical carriers enter the erbium-doped fiber amplifier and are amplified to a value higher than the threshold of stimulated Brillouin scattering, then enter the highly nonlinear fiber through the first circulator, and are Brillouin scattering occurs in the highly nonlinear fiber, and two Stokes waves are excited back to the first circulator; the two Stokes waves enter the second circulator through the first circulator, and then pass through the second circulator. When the circulator enters the single-mode fiber, reverse Rayleigh scattering occurs, and the single-mode fiber acts as a feedback fiber to make the reverse Rayleigh scattered light enter the highly nonlinear fiber through the second circulator to provide distributed feedback, which is highly The nonlinear fiber gain amplification forms a narrow linewidth laser, and the compressed two narrow linewidth laser beams enter the photodetector at the beat frequency to generate a narrow linewidth target microwave signal. After passing through the power divider, a part of the target microwave signal is output to the spectrum. The other part is fed back to the intensity modulator as a start-up signal to form an optoelectronic oscillator structure.

(3) Beneficial effects

It can be seen from the above technical solutions that the tunable ultra-narrow linewidth optoelectronic oscillator and method based on random Brillouin fiber lasers of the present disclosure have at least one of the following beneficial effects:

(1) Using the modulation characteristics of intensity modulators, the nonlinear characteristics of high nonlinear fibers, the feedback characteristics of single-mode fibers, the fast wavelength tunable characteristics of tunable lasers, and the microwave generation performance of photoelectric oscillators, the center frequency can be generated. to adjust and stabilize the microwave signal with extremely narrow linewidth;

(2) Since the system does not require optical and electrical filters, the frequency of the microwave signal generated by the photoelectric oscillator loop is determined by the frequency difference between the two lasers emitted by the tunable laser. Therefore, by adjusting the two tunable lasers The wavelength difference can realize broadband tuning of microwave signals.

Description of drawings

FIG. 1 is a schematic structural diagram of a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser according to an embodiment of the present disclosure.

FIG. 2 is a spectral line diagram of a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser according to an embodiment of the present disclosure.

[Description of Symbols of Main Elements of the Embodiments of the Present Disclosure in the Drawings]

1. The first tunable laser; 2. The second tunable laser

3. Coupler; 4. Beam splitter

5. Intensity modulator 6. Erbium-doped fiber amplifier

7. The first circulator 8. High nonlinear fiber

9. The second circulator 10 single-mode fiber

11. Photodetector 12. Power divider

13. Phase-locked loop system.

Detailed ways

The present disclosure provides a tunable ultra-narrow linewidth optoelectronic oscillator and method based on a random Brillouin fiber laser. Utilizing the modulation characteristics of intensity modulators, the nonlinear characteristics of high nonlinear fibers, the feedback characteristics of single-mode fibers, the fast wavelength tunability characteristics of tunable lasers, and the microwave generation performance of photoelectric oscillators, the center frequency can be adjusted, and Stabilize microwave signals with extremely narrow linewidths.

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the specific embodiments and the accompanying drawings.

Certain embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, some but not all embodiments of which are shown. Indeed, various embodiments of the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In an exemplary embodiment of the present disclosure, a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser is provided. FIG. 1 is a schematic structural diagram of a tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser according to an embodiment of the present disclosure. As shown in FIG. 1, the tunable ultra-narrow linewidth optoelectronic oscillator based on random Brillouin fiber laser includes: a first tunable laser 1, a second tunable laser 2, a coupler 3, a beam splitter 4, intensity modulator 5, erbium-doped fiber amplifier 6, first circulator 7, high nonlinear fiber 8, second circulator 9, single-mode fiber 10, photodetector 11, power divider 12 and phase-locked loop system 13, An instant feedback system is formed, which can make the two laser beams emitted by the two tunable lasers have a fixed and stable phase difference. By adjusting the wavelength difference of the two tunable lasers, the photoelectric oscillator system can generate microwave signals with extremely narrow linewidth and good stability.

The first tunable laser 1 is connected to the first input end of the coupler 3, the output end of the second tunable laser 2 is connected to the second input end of the coupler 3, and the output end of the coupler 3 is connected to the input end of the beam splitter 4 , the first output end of the beam splitter 4 is connected to the input end of the phase locked loop system 13, the output end of the phase locked loop system 13 is connected to the second tunable laser 2; the second output end of the beam splitter 4 is connected to the input end of the intensity modulator 5 end, the output end of the intensity modulator 5 is connected to the input end of the erbium-doped fiber amplifier 6, the output end of the erbium-doped fiber amplifier 6 is connected to the input end of the first circulator 7, and the first output end of the first circulator 7 is connected to the second annular The first input end of the circulator 9, the second output end is connected to the first end of the high nonlinear fiber 8, and the second end of the high nonlinear fiber 8 is connected to the second input end of the second circulator 9, and the output of the second circulator 9 The end is connected to the first end of the single-mode fiber 10, the second end of the single-mode fiber is connected to the input end of the photodetector 11, the output end of the photodetector 11 is connected to the input end of the power divider 12, and the first output end of the power divider 12 is connected to The spectrum analyzer, the second output is connected to the intensity modulator, thereby forming an oscillation loop.

Among them, the first tunable laser 1, the second tunable laser 2, a coupler 3, a beam splitter 4, an intensity modulator 5, an erbium-doped fiber amplifier 6, a first circulator 7, The second circulator 9, a highly nonlinear light 8, a single-mode fiber 10, and a photodetector 11 are connected through an optical fiber, and the beam splitter 4 and the phase-locked loop system 13 are connected through an optical fiber. A photodetector 11 , a power divider 12 , and an intensity modulator 5 are connected through a cable, and a phase-locked loop system 13 and a tunable laser 2 are connected through a cable.

First tunable laser 1, second tunable laser 2, coupler 3, intensity modulator 5, erbium-doped fiber amplifier 6, first circulator 7, second circulator 9, high nonlinear fiber 8, single-mode fiber 10 together form a random Brillouin fiber laser, the center wavelength of which is determined by the center wavelength of the first tunable laser 1 and the second tunable laser 2, and can emit laser light with extremely narrow linewidth.

Specifically, the first tunable laser 1 and the second tunable laser 2 are semiconductor lasers whose wavelengths can be tuned rapidly and continuously.

The high nonlinear fiber 8 is a high-Q microwave energy storage element with optical nonlinearity, and its length ranges from hundreds of meters to tens of kilometers.

The single-mode fiber 10 is a feedback element with low loss and has a length ranging from several kilometers to tens of kilometers.

Further, the dispersion of the optoelectronic oscillator loop should be controlled to zero, so that signals of different frequencies have the same delay in the loop.

The phase-locked loop system 13 is used to control and ensure that the optical signals emitted by the first tunable laser 1 and the second tunable laser 2 have a stable phase difference.

When the system is working, the first tunable laser 1 and the second tunable laser 2 emit two laser beams with a specific frequency difference, which are coupled into one channel through the coupler 3. At this time, the spectrum is shown in (a) in Fig. After the beam splitter 4 is divided into two parts, one of them enters the phase-locked loop system 13 and feeds back to the tunable laser 2 immediately, so that there is a gap between the laser light emitted by the first tunable laser 1 and the second tunable laser 2. A fixed phase difference, the other one enters the intensity modulator 5 and is modulated by the microwave signal generated by the beat frequency to generate two positive first-order sidebands with a frequency difference equal to the frequency difference between the two laser beams (the scope discussed here is small signal modulation, so other high-order sidebands are ignored); the modulated two optical carriers, as shown in Figure 2(b), enter the erbium-doped fiber amplifier and are amplified above the threshold of stimulated Brillouin scattering After that, it enters the highly nonlinear fiber 8 through the circulator 7, and Brillouin scattering occurs in the highly nonlinear fiber 8, and two Stokes waves are excited back to the circulator 7. The spectrum at this time is as follows As shown in Fig. 2 (c); and two Stokes waves enter the circulator 9 through the circulator 7, and then enter the single-mode fiber 10 through the circulator 9 to generate reverse Rayleigh scattering, and the single-mode fiber 10 As a feedback fiber, the reverse Rayleigh scattered light enters the highly nonlinear fiber 8 through the circulator 9 to provide distributed feedback, which is amplified by the gain to form a narrow linewidth laser, and the compressed two narrow linewidth laser beams enter The beat frequency in the photodetector 11 generates a target microwave signal with a narrow line width. After passing through the power divider 12, a part of the target microwave signal is output to the spectrum analyzer for observation, and the other part is fed back to the intensity modulator 5 as a start-up signal, thereby The photoelectric oscillator structure is formed, and the formed photoelectric oscillator structure realizes the continuous narrowing of the microwave signal. Because of the double guarantee of the phase-locked loop system and the photoelectric oscillator structure, the generated microwave signal has better stability; The extremely narrow linewidth laser generated by the Liouin fiber laser ensures that the microwave signal with extremely narrow linewidth can be generated.

Since the system does not need optical or electrical filters, the frequency of the microwave signal generated by the photoelectric oscillator loop is determined by the frequency difference between the two lasers emitted by the tunable laser, so broadband tuning of the microwave signal can be achieved. In addition, it can be seen from (d) in Fig. 2 that other clutters are generated by the beat frequency of the spectrum shown in the figure, but firstly, these optical powers are relatively small, and the generated clutter power is relatively small. When the random laser power generated by the Brillouin fiber laser is large enough, it can inhibit other generated microwave signals, so it will not affect the quality of the generated signals.

In addition, the above definitions of various elements and methods are not limited to various specific structures, shapes or manners mentioned in the embodiments, and those of ordinary skill in the art can simply and familiarly replace their structures, such as: Amplify the signal by adding an electric amplifier in the middle; any other form of phase-locked loop system that can be phase-locked can be used, and so on. Also, the attached drawings are simplified and used as examples. The number, shape and size of the devices shown in the drawings may be modified according to the actual situation, and the configuration of the devices may be more complicated.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the accompanying drawings or the text of the description, the implementations that are not shown or described are in the form known to those of ordinary skill in the technical field, and are not described in detail. In addition, the above definitions of various elements and methods are not limited to various specific structures, shapes or manners mentioned in the embodiments, and those of ordinary skill in the art can simply modify or replace them.

It should also be noted that the directional terms mentioned in the embodiments, such as "up", "down", "front", "rear", "left", "right", etc., only refer to the directions of the drawings, not used to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are denoted by the same or similar reference numbers. Conventional structures or constructions will be omitted when it may lead to obscuring the understanding of the present disclosure.

Moreover, the shapes and sizes of the components in the figures do not reflect the actual size and proportion, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless known to the contrary, the numerical parameters set forth in this specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained from the teachings of the present disclosure. Specifically, all numbers used in the specification and claims to indicate compositional contents, reaction conditions, etc., should be understood as being modified by the word "about" in all cases. In general, the meaning expressed is meant to include a change of ±10% in some embodiments, a change of ±5% in some embodiments, a change of ±1% in some embodiments, and a change of ±1% in some embodiments. Example ±0.5% variation.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The ordinal numbers such as "first", "second", "third", etc. used in the description and the claims are used to modify the corresponding elements, which themselves do not mean that the elements have any ordinal numbers, nor do they Representing the order of a certain element and another element, or the order in the manufacturing method, the use of these ordinal numbers is only used to clearly distinguish an element with a certain name from another element with the same name.

Furthermore, unless the steps are specifically described or must occur sequentially, the order of the above steps is not limited to those listed above, and may be varied or rearranged according to the desired design. And the above embodiments can be mixed and matched with each other or with other embodiments based on the consideration of design and reliability, that is, the technical features in different embodiments can be freely combined to form more embodiments.

Those skilled in the art will understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination, unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also, in a unit claim enumerating several means, several of these means can be embodied by one and the same item of hardware.

Similarly, it will be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together into a single embodiment, figure, or its description. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of the present disclosure.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure.

Claims (10)

1. The tunable ultra-narrow linewidth photoelectric oscillator based on the random Brillouin fiber laser comprises tunable lasers (1), second tunable lasers (2), a coupler (3), a beam splitter (4), an intensity modulator (5), an erbium-doped fiber amplifier (6), a circulator (7), high-nonlinearity fibers (8), a second circulator (9), a single-mode fiber (10), a photoelectric detector (11), a power divider (12) and a phase-locked loop system (13), wherein instant feedback systems are formed, so that two beams of laser emitted by the two tunable lasers have a fixed and stable phase difference;

   wherein, the tunable laser (1) is connected to the input end of the coupler (3), the output end of the second tunable laser (2) is connected to the second input end of the coupler (3), the output end of the coupler (3) is connected to the input end of the beam splitter (4), the output end of the beam splitter (4) is connected to the input end of the phase-locked loop system (13), the output end of the phase-locked loop system (13) is connected to the second tunable laser (2), the second output end of the beam splitter (4) is connected to the input end of the intensity modulator (5), the output end of the intensity modulator (5) is connected to the input end of the erbium-doped fiber amplifier (6), the output end of the erbium-doped fiber amplifier (6) is connected to the input end of the circulator (7), the output end of the circulator (7) is connected to the second input end of the of the second circulator (9), the second output end is connected to the end of the high nonlinearity fiber (8), the second end of the high nonlinearity fiber (8) is connected to the second input end of the second circulator (9), the output end of the second circulator (9) is connected to the second input end 7312, the output end of the single-mode optical fiber (49311) is connected to the photoelectric detector (3), the single-mode optical fiber detector (3) is connected to the single-loop system, the single-mode.
2. 2. The tunable ultra-narrow linewidth optoelectronic oscillator of claim 1, wherein the optoelectronic oscillator system can generate a microwave signal with extremely narrow linewidth and good stability by adjusting the wavelength difference between the th tunable laser (1) and the second tunable laser (2).
3. 3. The tunable ultra-narrow linewidth optoelectronic oscillator according to claim 1, wherein the th tunable laser (1), the second tunable laser (2), the coupler (3), the beam splitter (4), the intensity modulator (5), the erbium-doped fiber amplifier (6), the th circulator (7), the second circulator (9), the high nonlinear optical fiber (8) and the single-mode optical fiber (10), the photodetectors (11) are connected with each other through optical fibers, the beam splitter (4) and the phase-locked loop system (13) are connected with each other through optical fibers, the photodetectors (11), the power splitter (12), the intensity modulator (5) are connected with each other through cables, and the phase-locked loop system (13) and the tunable laser (2) are connected with each other through cables.
4. 4. The tunable ultra-narrow linewidth optoelectronic oscillator according to claim 1, wherein the th tunable laser (1), the second tunable laser (2), the coupler (3), the intensity modulator (5), the erbium-doped fiber amplifier (6), the th circulator (7), the second circulator (9), the highly nonlinear fiber (8) and the single-mode fiber (10) constitute random brillouin fiber lasers, and the center wavelengths of the lasers are determined by the center wavelengths of the th tunable laser (1) and the second tunable laser (2), and can emit laser light with an extremely narrow linewidth.
5. 5. The tunable ultra-narrow linewidth optoelectronic oscillator of claim 1, wherein the th tunable laser (1) and the second tunable laser (2) are semiconductor lasers with the wavelength capable of being tuned rapidly and continuously.
6. 6. The tunable ultra-narrow linewidth optoelectronic oscillator of claim 1, wherein the high nonlinear optical fiber (8) is a high Q microwave energy storage element with optical nonlinearity, with a length of hundreds of meters to tens of kilometers.
7. 7. The tunable ultra-narrow linewidth optoelectronic oscillator of claim 1, wherein the single-mode fiber (10) is a low loss feedback element having a length of several kilometers to tens of kilometers.
8. 8. The tunable ultra-narrow linewidth optoelectronic oscillator of claim 1, wherein the dispersion of the optoelectronic oscillator loop is controlled to zero so that signals of different frequencies have the same delay in the loop.
9. 9. The tunable ultra-narrow linewidth optoelectronic oscillator according to claim 1, wherein the phase-locked loop system (13) is used for controlling and ensuring that the th tunable laser (1) and the second tunable laser (2) emit optical signals with stable phase difference.
10. 10, method of tunable ultra-narrow linewidth optoelectronic oscillator based on random Brillouin optical fiber laser as claimed in claim 1, comprising that a second tunable laser (1) and a second tunable laser (2) emit two lasers with specific frequency difference, which are coupled to via a coupler (3), and split into two via a beam splitter (4) , wherein enters a phase-locked loop system (13) and instantly feeds back to the second tunable laser (2), so that there is a fixed phase difference between the lasers emitted from tunable laser (1) and the second tunable laser (2), and enters an intensity modulator (8655) to be modulated by microwave signal generated by beat frequency, two positive orders with frequency difference equal to frequency difference of the laser frequency difference are generated, two optical carriers after sideband enter a ring erbium-doped ring fiber amplifier to be amplified to be higher than scattering threshold value, enter a high linear nonlinear optical fiber (8) via a circulator (7), and enter a second nonlinear optical fiber (9) as a narrow-linewidth optical fiber oscillator, and a narrow-line-width optical fiber oscillator, wherein the two lasers enter a second multimode fiber (9) and a narrow-frequency-scattering fiber spectrometer (9) to be amplified as narrow-line-width optical fiber-scattering optical fiber oscillator, and a narrow-frequency-fiber-based nonlinear optical fiber laser-fiber-based on-fiber laser-Raman-fiber laser-fiber optical-fiber-.

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