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CN112582867B - A Forward Brillouin Fiber Laser Based on Stimulated Raman-like - Google Patents

A Forward Brillouin Fiber Laser Based on Stimulated Raman-like Download PDF

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CN112582867B
CN112582867B CN202011415374.1A CN202011415374A CN112582867B CN 112582867 B CN112582867 B CN 112582867B CN 202011415374 A CN202011415374 A CN 202011415374A CN 112582867 B CN112582867 B CN 112582867B
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optical coupler
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CN112582867A (en
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刘毅
宁钰
商瑶
陈鹏飞
顾源琦
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Taiyuan University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate

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Abstract

The invention discloses a forward Brillouin fiber laser based on stimulated Raman, which comprises a tunable single-frequency laser, an erbium-doped fiber amplifier, a polarization controller, an optical coupler, a single-mode fiber, a polarization beam combiner, a photodiode, a spectrometer and a spectrometer. The advantages and positive effects of the forward Brillouin fiber laser based on the stimulated Raman are particularly embodied in that compared with the existing Brillouin fiber laser, the forward Brillouin fiber laser based on the stimulated Raman fiber laser utilizes the stimulated Raman R with equal frequency intervals and related to the fiber core diameter0mThe mode improves the design flexibility of the resonant cavity and realizes the Brillouin fiber laser irrelevant to the cavity length.

Description

Forward Brillouin fiber laser based on stimulated Raman
Technical Field
The invention belongs to the field of laser research, and particularly relates to a forward Brillouin fiber laser based on stimulated Raman.
Background
The Brillouin optical fiber laser has the characteristics of narrow line width, high signal-to-noise ratio and the like, and has wide application in the fields of optical communication systems, optical fiber radio, optical bistable state, distributed/point type optical fiber sensing, super-light-speed optical transmission and the like because the signal advance is in inverse proportion to the line width. The stimulated Brillouin scattering of the optical fiber can be divided into forward Brillouin scattering and backward Brillouin scattering according to directions, and with the continuous research and development of domestic and foreign scholars on the forward Brillouin scattering in recent years, the forward Brillouin scattering can be used for the fields of comb-shaped frequency generation, optical attenuators, mode-locked fiber lasers, optical storage and the like due to the characteristics of self-phase matching and easy spontaneous generation of high-order Stokes and anti-Stokes.
In the existing literature, the researchers at home and abroad (Opt.express.14, pp.9731-9736, July,2007 issued by Zuxing Zhang et al; Opt.express.14, pp.10233-10238, October,2006 issued by L.Zhang et al; patent of inventions proposed by Yoghui, granted publication No. CN209487930U, "a multi-wavelength fiber laser based on a novel resonant cavity") all use backward Brillouin scattering to realize the adjustable Brillouin fiber laser in the resonant cavity, but still the design flexibility of the resonant cavity is influenced by the constraint of the cavity length.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned deficiencies of the prior art and providing a stimulated raman based forward brillouin fiber laser using stimulated raman like R with equal frequency spacing and related to fiber core diameter0mThe mode improves the design flexibility of the resonant cavity and realizes the output of the Brillouin optical fiber laser irrelevant to the cavity length.
In order to achieve the above object, a stimulated raman-based forward brillouin fiber laser is provided, including: the device comprises a tunable single-frequency laser, an erbium-doped fiber amplifier, a polarization controller, a first optical coupler, a second optical coupler, a single-mode fiber, a polarization beam combiner, a third optical coupler, a photodiode, a frequency spectrograph and a spectrometer;
pump light generated by a tunable single-frequency laser is amplified by an erbium-doped fiber amplifier, enters a port a of a first optical coupler through a polarization controller, is divided into two beams of coherent light which is transmitted in reverse direction, and is output from a port b and a port c of the first optical coupler, the port b and the port c of the first optical coupler are respectively and correspondingly connected to a port e and a port h of a second optical coupler, the pump light is divided into two beams of coherent light which are transmitted in reverse direction at the port e and the port h of the second optical coupler, light input from the port e is divided into two beams which are output from the port h and the port g, and light input from the port h is divided into two beams which are output from the port e and the port f; light output by the port f and the port g passes through a single-mode fiber loop, resonates, returns to the second optical coupler, and returns to the first optical coupler from the port e and the port h for demodulation; when the Brillouin gain of a resonant cavity formed by the second optical coupler and the single-mode fiber is higher than loss, a forward stimulated Raman laser signal is formed and is input from a port b and a port c of the first optical coupler, laser meeting a phase condition is output from a port d of the first optical coupler, light not meeting the phase condition is output from a port a of the first optical coupler, the laser output from the port d enters the third optical coupler and is divided into two beams to be output after the polarization state of the laser is adjusted by the polarization beam combiner, one beam is recorded by the photodiode and the spectrometer, and the other beam is recorded by the spectrometer.
The tunable fiber laser adopts a continuous operation laser with the center wavelength of 1550nm, the spectral line width of 400GHz, the side mode suppression ratio of more than 45dB, the relative noise of-145 dB/Hz, the maximum output power of 10dBm and the wavelength adjustable range of 1520-.
Wherein, the gain of the erbium-doped fiber amplifier is 15dB, and the wavelength range is 1528nm to 1565 nm.
The first optical coupler, the second optical coupler and the third optical coupler have a splitting ratio of 50:50 and are used for splitting the pump light into two coherent light beams.
Wherein the phase conditions are: and the laser output from the port e and the port h of the second optical coupler to the port b and the port c of the first optical coupler is divided into two beams of laser under the action of the first optical coupler, and the two beams of laser are output from the port a and the port d of the first optical coupler respectively.
Wherein the single mode fiber is an SM-28 single mode fiber with the length of 10km, and provides nonlinear Brillouin gain.
The response bandwidth of the photodiode is 0-12 GHz, and the response wavelength range is 400-1650 nm.
The bandwidth of the frequency spectrograph is 0-26.5 GHz, and the minimum resolution is 1Hz, so that the frequency spectrograph is used for analyzing the electric signals converted by the photoelectric detector.
Wherein the resolution of the spectrometer is 0.02nm and is used for observing laser output.
Different from the prior art, the stimulated Raman-based forward Brillouin fiber laser comprises a tunable laser, an EDFA, a polarization controller, an optical coupler, a single-mode fiber, a polarization beam combiner, a first-order-matching-mode-matching-mode, a second-matching-mode and a third-matching-mode,Photodiode, spectrometer, spectrum appearance. The invention utilizes the principle that forward stimulated Raman Brillouin scattering which has the same polarization characteristic as Ranan scattering and only changes the phase without changing the polarization state generates forward Brillouin laser in a resonant cavity formed by single-mode fibers, and utilizes the stimulated Raman scattering effect to generate a plurality of equally spaced R types which are related to the fiber core diameter and unrelated to the cavity length of the resonant cavity0mThe mode improves the design flexibility of the resonant cavity of the laser, and realizes the laser free spectral range irrelevant to the cavity length.
Drawings
Fig. 1 is a schematic structural diagram of a stimulated raman-based forward brillouin fiber laser provided by the present invention.
In the figure: 1. a tunable fiber laser; 2. an erbium-doped fiber amplifier; 3. a polarization controller; 4. a first optical coupler; 5. a second optical coupler; 6. a single mode optical fiber; 7. a polarization beam combiner; 8. a third optical coupler; 9. a photodiode; 10. a frequency spectrograph; 11. a spectrometer.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, the present invention provides a stimulated raman-based forward brillouin fiber laser, including: the device comprises a tunable single-frequency laser 1, an erbium-doped fiber amplifier 2, a polarization controller 3, a first optical coupler 4, a second optical coupler 5, a single-mode fiber 6, a polarization beam combiner 7, a third optical coupler 8, a photodiode 9, a frequency spectrograph 10 and a spectrometer 11;
pump light generated by a tunable single-frequency laser 1 is amplified by an erbium-doped fiber amplifier 2, enters a port a of a first optical coupler 4 through a polarization controller 3, is divided into two beams of coherent light which is transmitted in reverse, and is output from a port b and a port c of the first optical coupler 4, the port b and the port c of the first optical coupler 4 are respectively and correspondingly connected to a port e and a port h of a second optical coupler 5, the pump light is divided into two beams of coherent light which is transmitted in reverse at the port e and the port h of the second optical coupler 5, light input from the port e is divided into two beams which are output from the port h and the port g, and light input from the port h is divided into two beams which are output from the port e and the port f; light output by the port f and the port g passes through the single-mode optical fiber ring 6, resonates and returns to the second optical coupler 5, and then returns to the first optical coupler 4 from the port e and the port h for demodulation, when the Brillouin gain of a resonant cavity formed by the second optical coupler 5 and the single-mode optical fiber 6 is higher than loss, forward stimulated Raman laser signals are formed and input from the port b and the port c of the first optical coupler 4, laser meeting a phase condition is output from the port d of the first optical coupler 4, light not meeting the phase condition is output from the port a of the first optical coupler 4, the laser output by the port d enters the third optical coupler 8 and is divided into two beams for output after the polarization state of the laser is adjusted by the polarization combiner 7, one beam is recorded by the photodiode 9 and the frequency spectrometer 10, and the other beam is recorded by the spectrometer 11.
The tunable fiber laser 1 is a continuous operation laser with a center wavelength of 1550nm, a spectral line width of 400GHz, a side mode suppression ratio of 45dB, a relative noise of-145 dB/Hz, a maximum output power of 10dBm and a wavelength adjustable range of 1520-.
Wherein, the gain of the erbium-doped fiber amplifier 2 is 15dB, and the wavelength range is 1528nm to 1565 nm. The polarization controller 3 is used to adjust the polarization state of the pump light, and the polarization beam combiner 7 is used to adjust the polarization state of the output light.
The splitting ratio of the first optical coupler 4, the second optical coupler 5 and the third optical coupler 8 is 50:50, and the first optical coupler, the second optical coupler and the third optical coupler are used for splitting the pump light into two coherent light beams.
Wherein the phase conditions are: the laser beams output from the ports e and h of the second optical coupler 5 to the ports b and c of the first optical coupler 4 are divided into two laser beams under the action of the first optical coupler 4, and the two laser beams are output from the ports a and d of the first optical coupler 4, if the laser beams output from the ports b and c of the first optical coupler 4 to the ports d are in the same phase, the phase condition is satisfied, otherwise, the phase condition is not satisfied.
Wherein the single mode fiber 6 is an SM-28 single mode fiber having a length of 10km, providing a nonlinear brillouin gain.
The response bandwidth of the photodiode 9 is 0-12 GHz, and the response wavelength range is 400-1650 nm.
The bandwidth of the spectrometer 10 is 0-26.5 GHz, and the minimum resolution is 1Hz, so as to analyze the electrical signal converted by the photodetector.
Wherein the spectrometer 11 has a resolution of 0.02nm and is used to observe the laser output.
The principle of the laser generating forward Brillouin laser is as follows:
continuous pump light is divided into two bundles of light after entering the single mode fiber ring, a bundle of light is transmitted along the original optical path forward, another bundle of light returns to the loop after transmitting a week along the loop anticlockwise, return to the loop and divide into two bundles of light again, repeat the above-mentioned process, the coherent light that satisfies the ring length condition takes place to interfere the stack, it is the same process that another bundle of reverse transmission's that is divided by second optical coupler 5 this moment light also gets into the single mode fiber ring, two bundles of reverse light take place to resonate in the loop, when the brillouin gain that produces in the resonant cavity is greater than when the loss, output forward brillouin laser.
The output forward Brillouin laser is reversely input into the first optical coupler 4 from e and h ports of the second optical coupler 5 with a phase difference of pi/2, one laser beam of the original phase enters the first optical coupler 4 anticlockwise and then is divided into two beams, one laser beam keeps the original phase and is output from an a port, the other laser beam with the phase difference of pi/2 is output from a d port, the other laser beam with the phase difference of pi/2 input from the second optical coupler 5 is divided into two beams in the first optical coupler 4, one laser beam keeps the phase difference of pi/2 and is output from the d port clockwise, the other laser beam is output from an a port anticlockwise with the phase difference of pi, coherent superposition is realized because the phase of the d port of the first optical coupler 4 meets a matching condition, and the forward Brillouin laser generated in the resonant cavity is demodulated and output from the d port.
Forward class R0mA mode is a radial mode, which expands and compresses simultaneously only in all directions, and the characteristic equation of this mode can be simplified as follows:
(1-α2)J0(ym)-α2J2(ym)＝0 (1-1)
wherein y ism＝aΩm/VL. a is the radius of the optical fiber, and a series of characteristic values y can be obtained by solving equation (1-1)mTo obtain a series of R-like0mMode frequency omegam. From the calculation results, a plurality of classes R are observed0mThe mode frequencies of the modes are approximately equally spaced (≈ 50MHz) and are related to the fiber core diameter of the fiber and are independent of the resonator cavity length.
The fiber ring resonator FSR can be expressed as:
Figure BDA0002816246710000061
c＝3×108m/s is the speed of light in vacuum, n is the effective refractive index of the optical fiber, L is the ring length of the resonant cavity, because the laser must be generated by matching the Brillouin frequency shift amount of the gain spectrum and the resonant cavity mode at the same time, and a plurality of longitudinal modes in the resonant cavity are related to the core diameter of the optical fiber and unrelated to the cavity length of the resonant cavity, the invention has great flexibility in the design of the resonant cavity and can realize the free spectral range of the laser unrelated to the cavity length.
Compared with the existing Brillouin fiber laser which must meet the matching relation of the cavity length in the multi-longitudinal mode and the free laser spectrum range, the forward Brillouin fiber laser based on stimulated Raman provided by the invention utilizes a plurality of similar Rs generated by the stimulated Raman scattering effect0mThe mode has the characteristic of being related to the core diameter of the optical fiber and not related to the cavity length of the resonant cavity, and the flexibility of the laser in the aspect of resonant cavity design is improved.
The advantages and positive effects of the invention are embodied in the following aspects:
in the aspect of laser mode, the invention utilizes a plurality of R-like groups generated by stimulated Raman scattering effect0mThe modes are a plurality of longitudinal modes which have equal mode intervals, are only influenced by the optical fiber core diameter and are independent of the cavity length of the resonant cavity.
In the aspect of mechanism, the Brillouin fiber laser in the prior art can generate laser when the Brillouin frequency shift quantity of a gain spectrum and a resonant cavity mode are matched simultaneously, and the multiple longitudinal modes in the resonant cavity are related to the fiber core diameter and are unrelated to the cavity length of the resonant cavity, so that the design flexibility of the resonant cavity of the laser is improved, and the free spectral range of the laser which is not restricted by the cavity length is realized.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1.一种基于受激类拉曼的前向布里渊光纤激光器，其特征在于，包括：可调谐单频激光器（1）、掺铒光纤放大器 （2）、偏振控制器（3）、第一光耦合器（4）、第二光耦合器（5）、单模光纤（6）、偏振合束器（7）、第三光耦合器（8）、光电二极管（9）、频谱仪（10）及光谱仪（11）；1. A forward Brillouin fiber laser based on stimulated Raman, characterized in that it comprises: a tunable single-frequency laser (1), an erbium-doped fiber amplifier (2), a polarization controller (3), a an optical coupler (4), a second optical coupler (5), a single-mode optical fiber (6), a polarization beam combiner (7), a third optical coupler (8), a photodiode (9), a spectrometer ( 10) and spectrometer (11); 可调谐单频激光器（1）产生的泵浦光，经掺铒光纤放大器（2）放大后，通过偏振控制器（3）进入第一光耦合器（4）的端口a，被分为两束反向传输的相干光，从第一光耦合器（4）的端口b和端口c输出，第一光耦合器（4）的端口b和端口c分别对应连接至第二光耦合器（5）的端口e和端口h，在第二光耦合器（5）的端口e和端口h分别分成两束反向传输的相干光束，从端口e输入的光分成两束从端口h和端口g输出，从端口h输入的光分成两束从端口e和端口f输出；端口f和端口g输出的光经过单模光纤（6），发生谐振后返回到第二光耦合器（5）中，再从端口e和端口h返回到第一光耦合器（4）中发生解调，当第二光耦合器（5）和单模光纤（6）形成的谐振腔的布里渊增益高于损耗时，形成前向受激类拉曼激光信号从第一光耦合器（4）的端口b和端口c输入，其中满足相位条件的激光从第一光耦合器（4）端口d输出，不满足相位条件的光从第一光耦合器（4）端口a输出，所述相位条件是：从第二光耦合器（5）的端口e和端口h输出至第一光耦合器（4）的端口b和端口c的激光，在第一光耦合器（4）作用下均分为两束激光，分别从第一光耦合器（4）的端口a和端口d输出，若从第一光耦合器（4）的端口b和端口c输入的激光分出至端口d的激光同相位，则满足相位条件，否则不满足相位条件；经端口d输出的激光经偏振合束器（7）调整偏振状态后，进入第三光耦合器（8）中分为两束输出，一束由光电二极管（9）和频谱仪（10）记录光谱，另一束由光谱仪（11）记录光谱。The pump light generated by the tunable single-frequency laser (1), after being amplified by the erbium-doped fiber amplifier (2), enters the port a of the first optical coupler (4) through the polarization controller (3), and is divided into two beams The coherent light transmitted in the opposite direction is output from port b and port c of the first optical coupler (4), and ports b and c of the first optical coupler (4) are respectively connected to the second optical coupler (5) correspondingly The port e and port h of the second optical coupler (5) are respectively divided into two coherent beams propagating in opposite directions, and the light input from port e is divided into two beams output from port h and port g, The light input from port h is divided into two beams and output from port e and port f; the light output from port f and port g passes through the single-mode fiber (6), and returns to the second optical coupler (5) after resonance, and then from the single-mode fiber (6). Port e and port h return to the first optical coupler (4) for demodulation, when the Brillouin gain of the resonant cavity formed by the second optical coupler (5) and the single-mode fiber (6) is higher than the loss, The forward stimulated Raman-like laser signal is input from port b and port c of the first optical coupler (4), wherein the laser that meets the phase condition is output from port d of the first optical coupler (4), and does not meet the phase condition The light is output from port a of the first optocoupler (4), and the phase condition is: from ports e and h of the second optocoupler (5) to ports b and h of the first optocoupler (4) The laser at port c is equally divided into two laser beams under the action of the first optical coupler (4), which are respectively output from port a and port d of the first optical coupler (4). ), the laser input from port b and port c are in the same phase as the laser input to port d, then the phase condition is satisfied, otherwise the phase condition is not satisfied; after the laser output from port d is adjusted by the polarization beam combiner (7), the polarization state is adjusted. Entering the third optical coupler (8), it is divided into two output beams, one beam is recorded by the photodiode (9) and the spectrometer (10), and the other beam is recorded by the spectrometer (11). 2.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述可调谐单频激光器（1）采用中心波长为1550nm，光谱线宽为400 GHz，边模抑制比>45 dB，相对噪声为-145 dB/Hz，最大输出功率为10dBm，波长可调范围为1520-1630 nm的连续运行激光器。2. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the tunable single-frequency laser (1) adopts a center wavelength of 1550 nm and a spectral line width of 400 GHz , a side-mode rejection ratio >45 dB, a relative noise of -145 dB/Hz, a maximum output power of 10 dBm, and a CW laser with a wavelength tunable range of 1520-1630 nm. 3.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述掺铒光纤放大器（2）增益为15 dB，波长范围为1528 nm~1565 nm。3. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the erbium-doped fiber amplifier (2) has a gain of 15 dB and a wavelength range of 1528 nm to 1565 nm . 4.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述第一光耦合器（4）、第二光耦合器（5）、第三光耦合器（8）的分光比为50:50，用来将泵浦光分成两束相干光束。4. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the first optical coupler (4), the second optical coupler (5), the third optical coupler An optical coupler (8) with a split ratio of 50:50 is used to split the pump light into two coherent beams. 5.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述单模光纤（6）是长度为10 km的SM-28单模光纤，提供非线性布里渊增益。5. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the single-mode fiber (6) is an SM-28 single-mode fiber with a length of 10 km, providing Nonlinear Brillouin gain. 6.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述光电二极管（9）的响应带宽为0~12 GHz，响应波长范围为400 nm~1650 nm。6. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the photodiode (9) has a response bandwidth of 0 to 12 GHz, and a response wavelength range of 400 nm ~1650 nm. 7.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，频谱仪（10）带宽是0~26.5 GHz，最小分辨率是1 Hz，用以分析由光电探测器转化的电信号。7. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the spectrum analyzer (10) has a bandwidth of 0 to 26.5 GHz, and a minimum resolution of 1 Hz, which is used to analyze An electrical signal converted by a photodetector. 8.如权利要求1所述的基于受激类拉曼的前向布里渊光纤激光器，其特征在于，所述光谱仪（11）分辨率为0.02 nm，用来观测激光输出。8. The stimulated Raman-based forward Brillouin fiber laser according to claim 1, wherein the spectrometer (11) has a resolution of 0.02 nm, and is used to observe the laser output.
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