Demultiplexing comb-shaped Brillouin source generator for spectral synthesis

Abstract

This invention discloses a demultiplexed comb-shaped Brillouin source generator for spectral synthesis, comprising a laser generator, a highly nonlinear optical fiber, and a demultiplexing grating. The laser generator is used to modulate and generate a first pump comb laser and a first signal comb laser. The highly nonlinear optical fiber is connected to the laser generator and is used to reverse-transmit the first pump comb laser and the first signal comb laser, so that the first pump comb laser and the first signal comb laser, under the action of stimulated Brillouin gain, form a comb-shaped Brillouin laser of a preset frequency. The demultiplexing grating is used to separate the preset frequency spectral lines from the comb-shaped Brillouin laser of the preset frequency. This invention, by adjusting the frequency interval difference between the first pump comb laser and the first signal comb laser, under the action of the spectral vernier effect, uses an asynchronous optical field to drive the generation of a comb-shaped Brillouin laser with an adjustable frequency interval.

Description

Technical Field

[0001] This invention relates to the field of laser coherent synthesis technology, and more specifically to a demultiplexed comb-shaped Brillouin light source generator for spectral synthesis. Background Technology

[0002] Fiber lasers, due to their excellent power scaling capabilities and superior beam quality, are widely used in laser processing, directed energy applications, and UAV countermeasures. The thermal management, waveguide characteristics, robustness, and compact structure of fiber lasers facilitate modular design, enabling mass production while maintaining good beam quality and reliable, efficient plug-and-play capabilities. Over the past few decades, high-power fiber laser technology has matured considerably. The excellent gain performance of ytterbium-doped fibers and the development of mature active and passive components (such as fiber Bragg gratings and pump comb lasers) have enabled the power scaling of single-fiber, single-module lasers to reach tens of kilowatts. However, with the continuous increase in output power, the laser confined within a tens-of-μm fiber core excites various nonlinear effects, such as stimulated Brillouin scattering, stimulated Raman scattering, and instabilities, limiting the further power scaling of single-fiber modules. By utilizing coherent combining and spectral combining techniques, several or even hundreds of kilowatt-level fiber laser modules can be combined together, increasing power while ensuring no degradation in beam quality. Coherent combining technology requires active feedback control for multiple parallel fiber amplifiers, necessitating complex phase-locked loop mechanisms. Furthermore, coherent combining demands high directivity and spatial phase precision in the laser beam, making commercialization difficult. A simpler power-spreading method uses dispersive elements, such as gratings in free space, to combine lasers of different wavelengths from the outputs of multiple amplified fiber laser modules. This passive combining approach reduces the need for complex phase control but sacrifices spectral purity. However, power spreading to hundreds of kilowatts poses a significant challenge for spectral combining. Spectral combining requires multiple laser oscillator modules, outputting narrow-linewidth lasers with equal wavelength spacing between modules. Dozens or even hundreds of spectral combining systems mean using the same number of oscillators, undoubtedly increasing system complexity and cost. Utilizing the broadband spectral coverage of optical frequency combs, the desired frequency lines are selectively filtered out—a demultiplexing technique—to generate seed sources for spectral combining. These seed sources are then amplified individually and combined to obtain high-power lasers. However, generating comb spectra with frequency spacing exceeding 50 GHz in the 1 μm band is currently difficult due to limitations in modulator bandwidth and the low spectral resolution of demultiplexing optical elements. Furthermore, the low frequency spacing in demultiplexing comb spectra leads to reduced power of individual frequency lines, necessitating the addition of amplification stages in each demultiplexing arm, thus increasing system complexity. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a demultiplexed comb-shaped Brillouin light source generator for spectral synthesis. By adjusting the frequency interval difference between the pump comb laser and the signal comb laser, and under the influence of the spectral vernier effect, an asynchronous optical field can be used to drive the generation of a comb-shaped Brillouin laser with an adjustable frequency interval.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0005] This application provides a demultiplexed comb-shaped Brillouin light source generator for spectral synthesis, comprising:

[0006] A laser generator for modulating and generating a first pump comb laser and a first signal comb laser;

[0007] A highly nonlinear optical fiber is connected to the laser generator to transmit the first pump comb laser and the first signal comb laser in reverse, so that the first pump comb laser and the first signal comb laser form a comb Brillouin laser of a preset frequency under the action of stimulated Brillouin gain.

[0008] A demultiplexing grating is used to separate the preset frequency spectral lines from a comb-shaped Brillouin laser.

[0009] In some embodiments of this application, based on the foregoing scheme, the laser generator includes:

[0010] Single-frequency lasers are used to generate narrow-linewidth seed light;

[0011] An optical fiber beam splitter, connected to the single-frequency laser, is used to split the narrow-linewidth seed light into a pump path and a signal path according to a preset ratio, and output a second pump comb laser and a second signal comb laser.

[0012] The pump modulation unit, connected to the fiber beam splitter, includes a pump phase modulator and a fiber amplifier connected in sequence, for processing the second pump comb laser to generate the first pump comb laser.

[0013] The signal modulation unit, connected to the fiber optic beam splitter, includes a Brillouin frequency-matched modulator and a signal phase modulator connected in sequence, for processing the second signal comb laser to generate the first signal comb laser.

[0014] In some embodiments of this application, based on the aforementioned scheme, the center wavelength of the single-frequency laser is 1064-1070nm, and the linewidth is less than or equal to 6MHz.

[0015] In some embodiments of this application, based on the foregoing scheme, the first pump comb laser is an amplified signal with a repetition frequency of [missing information]. ;

[0016] The frequency of the first signal comb laser is ;

[0017] The relationship between the first pump comb laser and the first signal comb laser is as follows:

[0018]

[0019] in, The expression represents the Brillouin translation, and the relation represents the first signal comb laser's first... The spectral line was first pumped by the comb laser. Amplified spectral lines.

[0020] In some embodiments of this application, based on the aforementioned scheme, the first pump comb laser is input into the optical circulator through the first port of the optical circulator, and then injected into the highly nonlinear optical fiber through the second port of the optical circulator;

[0021] The first signal comb laser is injected into a highly nonlinear optical fiber through an optical isolator, and the propagation direction of the first pump comb laser in the highly nonlinear optical fiber is opposite to that of the first signal comb laser.

[0022] The preset frequency comb-shaped Brillouin laser is output from the third port of the optical circulator to the demultiplexing grating.

[0023] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included:

[0024] A phase modulator driver, the phase modulator driver comprising a reference clock, a first signal generator, a crystal oscillator, a second signal generator, a first phase shifter, a second phase shifter, a pump phase modulator, a Brillouin frequency-matched modulator, and a signal phase modulator;

[0025] The reference clock is divided into three paths, with the first path connected sequentially to the first signal generator and the pump phase modulator.

[0026] The second path is connected in sequence to the crystal oscillator, the second phase shifter, and the Brillouin frequency matching modulator;

[0027] The third path is sequentially connected to the second signal generator, the first phase shifter, and the signal phase modulator.

[0028] In some embodiments of this application, based on the aforementioned scheme, the adjustable range of the phase difference between the first phase shifter and the second phase shifter is 0-2π.

[0029] In some embodiments of this application, based on the foregoing scheme, the fiber beam splitter achieves a beam splitting ratio of 70%-90% for the second pump comb laser.

[0030] The fiber optic beam splitter has a splitting ratio of 10%-30% for the second signal comb laser.

[0031] Furthermore, the sum of the beam splitting ratio of the second pump comb laser and the beam splitting ratio of the second signal comb laser is 1.

[0032] In some embodiments of this application, based on the foregoing scheme, the highly nonlinear optical fiber is a photonic crystal or germanium-doped optical fiber, the length of the highly nonlinear optical fiber is 100-300 meters, and the nonlinear coefficient of the highly nonlinear optical fiber is greater than or equal to... .

[0033] In some embodiments of this application, based on the foregoing scheme, the channel spacing of the demultiplexing grating is... , The value is a positive integer, and the grating resolution of the demultiplexing grating is less than or equal to 0.1 nm.

[0034] The beneficial effects of this application are as follows:

[0035] The demultiplexing comb-shaped Brillouin light source generator provided in this application generates a comb-shaped Brillouin laser with adjustable frequency spacing for demultiplexing by adjusting the frequency interval difference between the first pump comb laser and the first signal comb laser under the action of the spectral vernier effect, driven by an asynchronous optical field. The spectral line spacing is determined by the frequencies of the first pump comb laser and the first signal comb laser, and any frequency can be adjusted to precisely match the diffraction grating used for demultiplexing, simplifying the frequency control system.

[0036] In addition, this application uses a laser generator as a seed light source, whose frequency components are phase-correlated, requiring no additional phase-locked loop circuit control, and no wavelength stabilization mechanism is needed to regulate the frequency spectrum; furthermore, this embodiment uses Brillouin gain to amplify the first signal comb laser, providing narrow-band gain, ensuring that each spectral line of the generated new comb spectrum has narrow linewidth characteristics.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are intended to explain the invention, but do not constitute an undue limitation thereof. In the drawings:

[0039] Figure 1This is a schematic diagram of a demultiplexed comb-shaped Brillouin light source generator for spectral synthesis according to this embodiment;

[0040] Figure 2 This is a schematic diagram of the laser generator in this embodiment;

[0041] Figure 3 This is a schematic diagram of the phase modulator driver in this embodiment;

[0042] Figure 4 This is a diagram showing the comb-shaped spectral energy distribution of the comb-shaped Brillouin laser in this embodiment.

[0043] Among them, 101 is the first pump comb laser; 102 is the first signal comb laser; 103 is the highly nonlinear fiber; and 104 is the demultiplexing grating.

[0044] 201. Single-frequency laser; 202. Fiber beam splitter; 203. Pump phase modulator; 204. Fiber amplifier; 205. Brillouin frequency-matched modulator; 206. Signal phase modulator; 207. Optical circulator; 208. Optical isolator;

[0045] 301. Reference clock; 302. First signal generator; 303. Crystal oscillator; 304. Second signal generator; 305. First phase shifter; 306. Second phase shifter. Detailed Implementation

[0046] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] It should be understood that the terms "comprising" and other similar expressions in the specification, claims, and accompanying drawings of this invention are intended to cover a non-exclusive inclusion, such as a process, method, system, or apparatus that includes a series of steps or units and is not limited to the listed steps or units. Furthermore, "first" and "second" are used to distinguish different objects and are not intended to describe a specific order.

[0048] Please see Figure 1 This embodiment provides a demultiplexed comb-shaped Brillouin light source generator for spectral synthesis, comprising:

[0049] A laser generator is used to modulate and generate a first pump comb laser 101 and a first signal comb laser 102;

[0050] A highly nonlinear fiber 103 is connected to a laser generator and is used to reverse the transmission of a first pump comb laser 101 and a first signal comb laser 102, so that the first pump comb laser 101 and the first signal comb laser 102 form a comb Brillouin laser of a preset frequency under the action of stimulated Brillouin gain.

[0051] The demultiplexing grating 104 is used to separate the preset frequency spectral lines from the comb-shaped Brillouin laser at a preset frequency.

[0052] This embodiment proposes a demultiplexing comb-shaped Brillouin light source generator for spectral synthesis. By adjusting the frequency interval difference between the first pump comb laser 101 and the first signal comb laser 102, under the action of the spectral vernier effect, an asynchronous optical field is used to drive the generation of a comb-shaped Brillouin laser with an adjustable frequency interval for demultiplexing. The spectral line interval is determined by the frequencies of the first pump comb laser 101 and the first signal comb laser 102. Any frequency can be adjusted to precisely match the diffraction grating used for demultiplexing, simplifying the frequency control system.

[0053] In addition, this embodiment uses a single single-frequency laser 201 as a seed light source, which generates phase-correlated frequency components, eliminating the need for additional phase-locked loop circuit control, and eliminating the need for wavelength stabilization mechanisms between frequency spectra; furthermore, this embodiment utilizes Brillouin gain to amplify the first signal comb laser 102, providing narrowband gain and ensuring that each spectral line generating the new comb spectrum has narrow linewidth characteristics.

[0054] In this embodiment, the highly nonlinear fiber 103 is a photonic crystal or germanium-doped fiber, with a length determined by the Brillouin gain drive, typically between 100 and 300 meters, and a nonlinear coefficient greater than or equal to... Brillouin shift = 11.2-14.2 GHz.

[0055] In this embodiment, the channel spacing of the demultiplexing grating 104 is... ( (where is a positive integer), and the grating resolution is less than or equal to 0.1 nm.

[0056] In this embodiment, the seed light generated by the same narrow-linewidth laser is modulated into the first pump comb laser 101 and the first signal comb laser 102, respectively. This allows the same seed source to generate two comb light sources, maintaining coherence between the two combs. Specifically, as shown... Figure 2 As shown, the laser generator includes:

[0057] Single-frequency laser 201 is used to generate narrow-linewidth seed light;

[0058] The fiber beam splitter 202 is connected to the single-frequency laser 201 and is used to split the narrow linewidth seed light into a pump path and a signal path according to a preset ratio, and output a second pump comb laser and a second signal comb laser. The beam splitting ratio of the fiber beam splitter 202 can be flexibly adjusted according to the power of the single-frequency laser 201 and the power of the final required single frequency component.

[0059] The pump modulation unit, connected to the fiber beam splitter 202, includes a pump phase modulator 203 and a fiber amplifier 204 connected in sequence, for processing the second pump comb laser to generate the first pump comb laser 101.

[0060] The signal modulation unit, connected to the fiber optic beam splitter 202, includes a Brillouin frequency matching modulator 205 and a signal phase modulator 206 connected in sequence, for processing the second signal comb laser to generate the first signal comb laser 102.

[0061] In some embodiments of this example, the beam splitting ratio of the fiber optic beam splitter 202 is flexibly adjusted according to the power of the single-frequency laser 201 and the power of the final required single frequency component. In one specific embodiment, the beam splitting ratio of the fiber optic beam splitter 202 to the second pump comb laser is 70%-90%, the beam splitting ratio of the fiber optic beam splitter 202 to the second signal comb laser is 10%-30%, and the sum of the beam splitting ratios of the second pump comb laser and the second signal comb laser is 1.

[0062] In some embodiments of this example, the center wavelength of the single-frequency laser 201 is 1064-1070nm and the linewidth is less than or equal to 6MHz. In a specific embodiment, for the spectral synthesis system, a center wavelength of 1070nm and a linewidth of 5MHz are typically selected.

[0063] In some embodiments of this example, the pump phase modulator 203 drives the first pump comb laser 101 to generate the required frequency sideband, such as 13 GHz; then the fiber amplifier 204 amplifies the modulated first pump comb laser 101 containing multiple frequency components, providing the first pump comb laser 101 required for stimulated Brillouin amplification.

[0064] In some embodiments of this example, the second signal comb laser first passes through the Brillouin frequency-matched modulator 205 to generate frequency components of... and The frequency sidebands are designed primarily to facilitate the calculation of the frequencies of the first pump comb laser 101 and the first signal comb laser 102, corresponding to the operating frequency spacing of the demultiplexing grating 104; for example, if the Brillouin frequency shift of the highly nonlinear fiber 103 used is 11.2 GHz, then... The signal phase modulator 206 then adjusts the phase of the first signal comb laser 102 again, generating more frequency sidebands to form a signal comb laser.

[0065] In some embodiments of this example, the first pump comb laser 101 is an amplified signal with a repetition frequency of [missing information]. The frequency of the first signal comb laser 102 is ,and ,in, The first signal comb laser 102 represents the first signal. One spectral line, This indicates the first pump comb laser 101. The spectral line represents the first signal comb laser 102. The spectral line was first pumped by the comb laser 101. Amplified spectral lines.

[0066] Thus, this embodiment uses an asynchronous optical field with a frequency spacing of 10-20 GHz to drive the generation of a comb-shaped Brillouin laser with an adjustable frequency spacing. This embodiment can provide comb-shaped lasers with a frequency spacing of more than 50 GHz for demultiplexing. Furthermore, this embodiment utilizes Brillouin gain to amplify the first signal comb-shaped laser 102, providing a narrowband gain of 40 MHz, ensuring that each spectral line of the generated new comb spectrum has narrow linewidth characteristics.

[0067] In one specific embodiment, select and Then the selection rule becomes Therefore, the first pump comb laser 101's... The first signal of the comb laser 102 is amplified by spectral amplification. The spectral line, the first pump comb laser 101's first... The first signal of the comb laser 102 is amplified by spectral amplification. Spectral lines, etc. The spacing of the selectively amplified lines on the comb laser 102, through this selective amplification of the first signal, is... This allows the generation of comb-shaped Brillouin lasers with higher frequency intervals using comb-shaped lasers with smaller frequency intervals, facilitating the separation of desired frequency components, such as... Figure 4 The diagram shows the comb-shaped spectral energy distribution of the comb-shaped Brillouin laser in this embodiment. Finally, after being amplified by Brillouin, the comb-shaped Brillouin laser is demultiplexed by grating 104 to separate the desired preset frequency spectral lines, providing a seed source for subsequent wavelength-division amplification.

[0068] In some embodiments of this example, in order to control unidirectional transmission in a specific path, a first pump comb laser 101 is input into an optical circulator 207 through a first port of the circulator 207, and then injected into a highly nonlinear fiber 103 through a second port of the circulator 207. A first signal comb laser 102 is injected into the highly nonlinear fiber 103 through an optical isolator 208. The transmission direction of the first pump comb laser 101 in the highly nonlinear fiber 103 is opposite to that of the first signal comb laser 102. This design facilitates the separation of the first pump comb laser 101 and the first signal comb laser 102. Under the action of stimulated Brillouin gain, a comb Brillouin laser of a preset frequency is formed and output from the third port of the circulator 207 to a demultiplexing grating 104. After passing through the demultiplexing grating 104, it is separated into a preset frequency spectral line required for spectral synthesis. The preset frequency spectral line is a single spectral line.

[0069] Example 2

[0070] In this embodiment, laser spectral synthesis requires a large number of single-spectrum lines for split-path laser amplification. The resolution of the grating used for synthesis needs to correspond to the comb-shaped frequency spacing to facilitate demultiplexing. To avoid long-term drift and frequency deviation caused by different electrical drive signals, this embodiment provides a phase modulator for a demultiplexed comb-shaped Brillouin source used for laser spectral synthesis.

[0071] Phase modulator driver for demultiplexed comb Brillouin sources used in laser spectral synthesis, such as Figure 3 As shown, it includes a reference clock 301, a first signal generator 302, a crystal oscillator 303, a second signal generator 304, a first phase shifter 305, a second phase shifter 306, a pump phase modulator 203, a Brillouin frequency-matched modulator 205, and a signal phase modulator 206.

[0072] Understandably, the reference clock 301, serving as the clock source for the entire system, determines the frequency position of each spectral line in the comb spectrum. It is divided into three paths, connected to the first signal generator 302, the crystal oscillator 303, and the second signal generator 304 respectively, to achieve in-phase and synchronization of the three frequency signals. The first signal generator 302 drives the pump phase modulator 203. The output of the crystal oscillator 303 is connected to the first phase shifter 305. In the overall system design, once the highly nonlinear fiber 103 is selected, its characteristic frequency is determined and remains unchanged throughout the system operation. Its output drives the Brillouin frequency-matched modulator 205. The first phase shifter 305 and the second phase shifter 306 function identically, compensating for phase differences caused by different optical and electronic circuit paths, ensuring that the stimulated Brillouin amplification gain frequency corresponds to the frequency of the first signal comb laser. The second signal generator 304 is connected to the second phase shifter 306, and its output drives the signal phase modulator 206 to generate the first signal comb laser 102.

[0073] In this embodiment, the second signal generator 304 drives the signal phase modulator 206 via the second phase shifter 306, and the adjustable range of the phase difference between the first phase shifter 305 and the second phase shifter 306 is 0-2π.

[0074] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0076] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A de-multiplexed comb-Bragg light source generation device for spectral synthesis, characterized in that, The application relates to a device for generating a de-multiplexed comb-like Brillouin light source for spectrum synthesis, comprising: a laser generator for modulated generation of a first pump comb laser and a first signal comb laser, wherein the laser generator comprises: a single-frequency laser for generating a narrow-linewidth seed light; a fiber beam splitter connected to the single-frequency laser for splitting the narrow-linewidth seed light into a pump path and a signal path at a preset ratio to output a second pump comb laser and a second signal comb laser; a pump modulation unit connected to the fiber beam splitter and comprising a pump phase modulator and a fiber amplifier connected in sequence for processing the second pump comb laser to generate the first pump comb laser; and a signal modulation unit connected to the fiber beam splitter and comprising a Brillouin frequency matching modulator and a signal phase modulator connected in sequence for processing the second signal comb laser to generate the first signal comb laser; wherein the first pump comb laser and the first signal comb laser satisfy the following relationship: wherein f is a frequency of the first pump comb laser, f0 is a frequency of the first signal comb laser, and f1 is a frequency of the second pump comb laser; and a de-multiplexing grating for separating a preset frequency spectrum line from the preset frequency comb Brillouin laser.

2. The device for generating a de-multiplexed comb-like Brillouin light source for spectrum synthesis according to claim 1, wherein the single-frequency laser has a central wavelength of 1064-1070 nm and a linewidth less than or equal to 6 MHz.

3. The device for generating a de-multiplexed comb-like Brillouin light source for spectrum synthesis according to claim 1, wherein the first pump comb laser is input into an optical circulator through a first port of the optical circulator and then injected into a high-nonlinear optical fiber through a second port of the optical circulator; the first signal comb laser is injected into the high-nonlinear optical fiber through an optical isolator, and the transmission direction of the first pump comb laser in the high-nonlinear optical fiber is opposite to that of the first signal comb laser; and the preset frequency comb Brillouin laser is output from a third port of the optical circulator to the de-multiplexing grating. The device further comprises: a phase modulator driver comprising a reference clock, a first signal generator, a crystal oscillator, a second signal generator, a first phase shifter, a second phase shifter, a pump phase modulator, a Brillouin frequency matching modulator and a signal phase modulator; the reference clock is divided into three paths, the first path is connected to the first signal generator and the pump phase modulator in sequence; the second path is connected to the crystal oscillator, the second phase shifter and the Brillouin frequency matching modulator in sequence; and the third path is connected to the second signal generator, the first phase shifter and the signal phase modulator in sequence.

5. The device for generating a de-multiplexed comb-like Brillouin light source for spectrum synthesis according to claim 4, wherein the phase difference of the first phase shifter and the second phase shifter is adjustable in a range of 0-2pi.

6. The device for generating a de-multiplexed comb-like Brillouin light source for spectrum synthesis according to claim 1, wherein the splitting ratio of the fiber beam splitter for the second pump comb laser is 70%-90%; the splitting ratio of the fiber beam splitter for the second signal comb laser is 10%-30%; and the sum of the splitting ratio of the second pump comb laser and the splitting ratio of the second signal comb laser is 1. A high nonlinear fiber is connected to the laser generator and used to reversely transmit the first pump comb laser and the first signal comb laser, so that the first pump comb laser and the first signal comb laser form a comb-like Brillouin laser with a preset frequency under the action of stimulated Brillouin gain, the first pump comb laser is an amplified signal, and the repetition frequency is ; The frequency of the first signal comb laser is ; ​ wherein, represents the Brillouin shift, said relation indicating that the nth spectral line of the first comb laser is amplified by the nth spectral line of the first pump comb laser; represents the Brillouin shift, said relation indicating that the nth spectral line of the first comb laser is amplified by the nth spectral line of the first pump comb laser; represents the Brillouin shift, said relation indicating that the nth spectral line of the first comb laser is amplified by the nth spectral line of the first pump comb laser; ​ ​ ​ ​ ​ ​ ​ 4. The device for generating a de-multiplexed comb-like Brillouin light source for spectral synthesis according to claim 1, wherein, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7. The device for generating a de-multiplexed comb-like Brillouin light source for spectral synthesis of claim 1, wherein: The high nonlinear fiber is a photonic crystal fiber or a germanium-doped fiber, the length of the high nonlinear fiber is 100-300 meters, and the nonlinear coefficient of the high nonlinear fiber is greater than or equal to .

8. The device for generating a de-multiplexed comb-like Brillouin light source for spectral synthesis of claim 1, wherein: The channel spacing of the demultiplexing grating is , is a positive integer, and the grating resolution of the demultiplexing grating is less than or equal to 0.1 nm.

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