CN112582866B - Random fiber laser and random fiber laser generation method - Google Patents
Random fiber laser and random fiber laser generation method Download PDFInfo
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- CN112582866B CN112582866B CN202011363226.XA CN202011363226A CN112582866B CN 112582866 B CN112582866 B CN 112582866B CN 202011363226 A CN202011363226 A CN 202011363226A CN 112582866 B CN112582866 B CN 112582866B
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- 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
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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Abstract
The application relates to the technical field of lasers, and provides a random fiber laser and a random fiber laser generation method, wherein the random fiber laser comprises the following steps: a Brillouin pumping light source for providing pumping laser; the gain optical fiber is connected with the Brillouin pumping light source through the connecting component to form a gain optical path and is used for transmitting pumping laser to the gain optical fiber and transmitting Brillouin Stokes light generated by the gain optical fiber to the connecting component; the random distributed feedback component is connected with the gain optical fiber through the connecting component to form a feedback optical path and is used for transmitting the Brillouin Stokes light to the random distributed feedback component and providing random distributed feedback, and transmitting the fed-back random laser back to the connecting component and outputting the random laser; the gain optical path and the feedback optical path are independent of each other. When the frequency stabilizing circuit is used, gain and feedback are carried out separately, and frequency stability is improved.
Description
Technical Field
The present application relates to the field of laser devices, and in particular, to a random fiber laser and a random fiber laser generation method.
Background
The narrow linewidth fiber laser is widely applied to the fields of optical sensing technology, laser radar ranging, coherent optical communication and the like, and the conventional narrow linewidth fiber laser based on the Fabry-Perot resonant cavity has the problems that the frequency of the narrow linewidth fiber laser is randomly shifted, the frequency noise is high, the linewidth is difficult to reduce and the like due to the thermal noise of the Fabry-Perot resonant cavity because the gain and the feedback occur at the same position.
In many high-precision coherent applications, narrow linewidth fiber lasers are not ideal for this application due to the instability of the laser output frequency.
Disclosure of Invention
It is a primary object of the present application to overcome the problem of unstable output laser frequency of the fiber laser in the prior art, and to provide a random fiber laser with high output frequency stability.
Another main object of the present application is to overcome the problem of unstable output laser frequency of the fiber laser in the prior art, and to provide a random fiber laser generation method with high output frequency stability.
According to an aspect of the present application, there is provided a random fiber laser including: a Brillouin pumping light source for providing pumping laser; the gain optical fiber is connected with the Brillouin pumping light source through a connecting component to form a gain optical path and is used for transmitting pumping laser to the gain optical fiber and transmitting Brillouin Stokes light generated by the gain optical fiber to the connecting component; the random distributed feedback component is connected with the gain optical fiber through a connecting component to form a feedback optical path and is used for transmitting Brillouin Stokes light to the random distributed feedback component, providing random distributed feedback and transmitting the fed-back random laser back to the connecting component and outputting the random laser; the gain optical path and the feedback optical path are independent of each other.
According to an embodiment of the application, the connection assembly comprises a first circulator and a second circulator: the first circulator is respectively connected with the Brillouin pumping light source, the gain optical fiber and the second circulator to form the gain loop, and is used for transmitting pumping laser to the gain optical fiber through the first circulator, transmitting Brillouin Stokes light generated by the gain optical fiber back to the first circulator, and transmitting the Brillouin Stokes light to the second circulator through the first circulator; the second circulator is further connected with the random distributed feedback assembly to form the feedback loop, and the feedback loop is used for transmitting the Brillouin Stokes light to the random distributed feedback assembly through the second circulator, providing random distributed feedback, and transmitting the fed-back random laser back to the second circulator and outputting the random laser. Through the arrangement of the first circulator and the second circulator, the feedback optical path and the gain optical path are fully separated, mutual interference is prevented, and therefore the frequency stability of the optical path is improved.
According to an embodiment of the present application, the random distributed feedback component includes: a random grating array connected with the second circulator and used for providing random distributed feedback for Brillouin Stokes light; faraday rotating mirror, with random grating array connects for will transmit random laser reflection of random grating array returns the problem that the feedback inefficiency is given back to the second circulator, random grating array can overcome the rayleigh scattering in the dorsad, adopts stimulated brillouin backscattering as the gain means, improves stronger random distributed feedback, can reduce pumping threshold power, narrows down the line width, improves frequency stability.
According to an embodiment of the present application, the random fiber laser further includes tunable optical amplifiers, and the tunable optical amplifiers are respectively connected to the random grating array and the faraday rotator mirror. Compared with the traditional random fiber laser scheme, the tunable optical amplifier is adopted to amplify the power of the random laser in the optical fiber loop, so that the pumping threshold is further reduced.
According to an embodiment of the present application, the random fiber laser further includes an isolator: and the Brillouin pump light source and the first circulator are respectively connected. The isolator is used for eliminating the Brillouin pump light source reflected by the first circulator to the Brillouin pump laser, so that the pump light source cannot be reflected to the Brillouin pump laser, and the light path is stable.
According to an embodiment of the present application, the random fiber laser further includes a coupler: the second circulator, the gain fiber and the air joint are respectively connected; the splitting ratio of the coupler is 50: 50. The coupler is used for leading out the random laser in the second circulator and used as an emergent port of the random laser. The coupler enables power distribution and can act as an exit for the random laser. Since the optical path of the random fiber laser is not enabled due to the excessively large difference of the splitting ratio, the value of the splitting ratio needs to be defined.
According to an embodiment of the present application, the gain fiber is a single mode fiber, a dispersion shifted fiber, a dispersion compensating fiber, a highly nonlinear fiber, or a highly nonlinear dispersion shifted fiber.
According to an embodiment of the present application, a laser linewidth of the brillouin pump light source is less than 10 kHz. The line width of the output random laser is determined by the line width of the pump laser, so that the line width of the output random laser is narrower only when the line width of the laser of the Brillouin pump light source is smaller than 10kHz, and the frequency stability is improved.
According to an embodiment of the present application, the length of the gain fiber is not less than 1 km. If the length of the gain fiber is too small, the pump laser cannot be gained, so the length of the gain fiber is ensured to be not less than 1 km.
According to another aspect of the present application, a random fiber laser generation method includes the steps of:
s001, generating Brillouin Stokes light: the Brillouin pump light source provides pump laser, the pump laser passes through the isolator and enters the gain fiber through the first circulator to generate Brillouin Stokes light;
s002, providing random distributed feedback: the Brillouin Stokes light sequentially passes through the first circulator and the second circulator and enters the random grating array, and the random grating array provides random distributed feedback;
s003, power amplification is carried out on the random laser: the tunable optical amplifier amplifies the power of the random laser transmitted by the random grating array, and the Faraday rotator mirror reflects the random laser after the power amplification back to the tunable optical amplifier for power amplification again;
s004, leading out random laser: and the random laser returns to the second circulator through the random grating array and is led out through the coupler.
According to the technical scheme, the random fiber laser and the random fiber laser generation method have the advantages and positive effects that:
according to the random fiber laser, on one hand, a random distributed feedback component is adopted to replace Rayleigh backscattering in a common single mode fiber to provide random distributed feedback, so that the pumping threshold power is reduced, the line width is narrowed, and the frequency stability is improved; on the other hand, pumping laser is transmitted through the connecting component firstly, the pumping laser enters the gain optical fiber for gain, and the gained Brillouin Stokes light enters the random distributed feedback component through the connecting component for feedback. Gain occurs in a gain fiber in a gain optical path and feedback occurs in a randomly distributed feedback component in a feedback optical path, and the gain optical path and the feedback optical path do not interfere with each other. The laser gain control method is used for solving the problem that the output laser frequency is unstable due to the fact that feedback and gain simultaneously occur in a resonant cavity in the existing laser, heat generated during laser gain affects the laser frequency greatly, the gain and feedback processes are respectively conducted in two optical devices of a gain optical fiber and a random distributed feedback assembly, the gain is conducted firstly and then fed back, although the heat generated during gain affects the laser frequency to a certain extent, laser enters the random distributed feedback assembly and feeds back, new heat cannot be generated, the heat generated before basically disappears, and therefore the stability of the emergent laser frequency can be guaranteed.
The random fiber laser generation method has the advantages that the random fiber laser generation method is consistent with the random fiber laser, in addition, the tunable optical amplifier amplifies the power of the random laser transmitted through the random grating array, the Faraday rotator mirror reflects the random laser after power amplification back to the tunable optical amplifier, the power amplification is carried out again, the power of the random laser is amplified for the second time through the matched use of the Faraday rotator mirror and the tunable optical amplifier, and the pumping threshold power can be obviously reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a random fiber laser shown in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a method of random fiber laser generation according to an exemplary embodiment.
Wherein the reference numerals are as follows:
1. a Brillouin pumping light source; 2. an isolator; 3. a first circulator; 4. a gain fiber; 5. a second circulator; 6. a random distributed feedback component; 61. a random grating array; 62. a Faraday rotator mirror; 7. a tunable optical amplifier; 8. a coupler.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1-2, fig. 1 is a schematic diagram of a random fiber laser according to an exemplary embodiment; FIG. 2 is a schematic diagram illustrating a random fiber laser generation method according to an exemplary embodiment.
The traditional narrow linewidth fiber laser generally adopts a Fabry-Perot resonant cavity with determined cavity length, a cavity mirror can be influenced by thermal noise to generate irregular jitter, the cavity length of the resonant cavity can be in irregular change, the cavity length of the resonant cavity is related to laser frequency, the emergent laser frequency is unstable, the laser frequency noise and the phase noise are increased, and the laser linewidth is widened.
In order to solve the above technical problem, the present application provides a random fiber laser. Referring to fig. 1, representatively illustrated in fig. 1 is a random fiber laser capable of embodying the principles of the present application, including; a brillouin pumping light source 1 for providing pumping laser; the gain optical fiber 4 is connected with the Brillouin pumping light source 1 through the connecting component to form a gain optical path and is used for transmitting pumping laser to the gain optical fiber 4 and transmitting Brillouin Stokes light generated by the gain optical fiber 4 to the connecting component; the random distributed feedback component 6 is connected with the gain fiber 4 through the connecting component to form a feedback light path and is used for transmitting the Brillouin Stokes light to the random distributed feedback component 6, providing random distributed feedback and transmitting the fed-back random laser back to the connecting component and outputting the random laser; the gain optical path and the feedback optical path are independent of each other.
According to the random fiber laser, on one hand, a random distributed feedback component 6 is adopted to replace Rayleigh backscattering in a common single-mode fiber to provide random distributed feedback, so that the pumping threshold power is reduced, the line width is narrowed, and the frequency stability is improved; on the other hand, pumping laser is transmitted through the connecting component, the pumping laser enters the gain fiber 4 for gain, and the gained brillouin stokes light enters the random distributed feedback component 6 through the connecting component for feedback. Gain occurs in the gain fiber 4 in the gain optical path and feedback occurs in the randomly distributed feedback component 6 in the feedback optical path, and the gain optical path and the feedback optical path do not interfere with each other. Aiming at the problems that feedback and gain occur in a resonant cavity simultaneously in the existing laser, and heat generated during laser gain has great influence on laser frequency to cause instability of output laser frequency, the gain and feedback processes are respectively carried out in two optical devices of a gain optical fiber 4 and a random distributed feedback component 6, and the gain is carried out first and then the feedback is carried out, although heat generated during gain has certain influence on the laser frequency, laser enters the random distributed feedback component and carries out feedback later, new heat cannot be generated, and the heat generated before basically disappears, so that the stability of the emergent laser frequency can be ensured.
In another exemplary embodiment, the connecting assembly includes a first circulator 3 and a second circulator 5: the first circulator 3 is respectively connected with the brillouin pumping light source 1, the gain fiber 4 and the second circulator 5 to form a gain loop, and is used for transmitting pumping laser to the gain fiber 4 through the first circulator 3, transmitting brillouin stokes light generated by the gain fiber 4 back to the first circulator 3, and transmitting the brillouin stokes light to the second circulator 5 through the first circulator 3; the second circulator 5 is further connected with the random distributed feedback component 6 to form a feedback loop, and the feedback loop is used for transmitting the brillouin stokes light to the random distributed feedback component 6 through the second circulator 5, providing random distributed feedback, and transmitting the fed-back random laser back to the second circulator 5 and outputting the random laser. The feedback optical path and the gain optical path are sufficiently separated by the arrangement of the first circulator 3 and the second circulator 5, so that mutual interference is prevented, and the frequency stability of the optical path is improved.
In another exemplary embodiment, as shown in fig. 2, the random distributed feedback component 6 includes: the random grating array 61 is connected with the second circulator 5 and is used for providing random distributed feedback for the Brillouin Stokes light; and a Faraday rotator mirror 62 connected to the random grating array 61 for reflecting the random laser light transmitted through the random grating array 61 back to the second circulator 5. The random distributed feedback component 6 can provide random distributed feedback for the Brillouin Stokes light and transmit the random laser after feedback back to the second circulator 5 for output, the random grating array 61 can overcome the problem of low feedback efficiency of backward Rayleigh scattering, stimulated Brillouin backward scattering is used as a gain means, stronger random distributed feedback is improved, pumping threshold power can be reduced, line width is narrowed, and frequency stability is improved.
It will be appreciated that the random grating array 61 does not have a resonant cavity of a defined length and typically relies on rayleigh backscattering of an ultra-long single mode fibre to provide random distributed feedback. The random is because the feedback position in the optical fiber is random, and has the characteristics of simple structure and narrow output line width. In addition, a plurality of random Fabry-Perot cavities can be formed in the random grating array 61, so that a plurality of random modes can be filtered, mode competition is reduced, the Brillouin gain efficiency is enhanced, frequency stability is provided, the cavity length is prevented from being determined, and the frequency drift and line width broadening effects caused by thermal noise of the resonant cavity are reduced. In addition, the random grating array 61 has no fixed cavity length inside, can be made into any shape, has the advantages of incoherent time-domain coherent space domain and the like, and has excellent application prospects in the fields of optical display, optical sensing, optical imaging and the like.
In another exemplary embodiment, as shown in fig. 2, the random fiber laser provided by the present application further includes a tunable fiber amplifier 7, and the tunable fiber amplifier 7 is respectively connected to the random grating array 61 and the faraday rotator mirror 62, and compared with the conventional random fiber laser scheme, the tunable fiber amplifier 7 is used to amplify the power of the optical fiber in the optical fiber loop, thereby further reducing the pumping threshold power.
In another exemplary embodiment, as shown in fig. 2, the random fiber laser provided by the present application further includes an isolator 2: the Brillouin pump light source 1 and the first circulator 3 are respectively connected and used for eliminating the pump laser reflected by the first circulator 3 to the Brillouin pump laser 1, so that the pump laser is provided more stably, and the stability of the whole optical path is improved.
In another exemplary embodiment, as shown in fig. 1-2, the random fiber laser provided by the present application further comprises a coupler 8: the second circulator 5, the gain fiber 4 and the air-splice are respectively connected to lead out the random laser in the second circulator 5 as an exit port of the random laser. The coupler 8 enables power distribution and can act as an exit for the random laser light.
Referring to fig. 2, in one embodiment of the present application, the output port of the brillouin pump laser 1 is connected to the input port of the isolator 2, the output port of the isolator 2 is connected to the first port of the first circulator 3, the second port of the first circulator 3 is connected to the gain fiber 4, the third port of the first circulator 3 is connected to the first port of the second circulator 5, the second port of the second circulator 5 is connected to one end of the random grating array 61, the other end of the random grating is connected to one end of the tunable optical amplifier 7, the other end of the tunable optical amplifier 7 is connected to the faraday rotator 62, the third port of the second circulator 5 is connected to the incident port of the coupler 8, and two exit ports of the coupler 8 are respectively connected to the gain fiber 4 and the null. As can be seen from the above, the ring cavity formed by the first circulator 3, the gain fiber 4, the second circulator 5 and the coupler 8 generates gain for the pump laser, and the random grating array 61 generates random distributed feedback for the random laser.
It should be clearly understood here that the present application describes how to make and use specific examples, but the principles of the present application are not limited to any details of these examples. Rather, these principles can be applied to many other examples using the knowledge gained from the present disclosure.
In another exemplary embodiment, the operating wavelengths of the brillouin pump light source 1, the first circulator 3, the second circulator 5, the random grating array 61, the tunable optical amplifier 7, the faraday rotator mirror 62, and the coupler 8 are all the same. The gain fiber 4 is a single mode fiber, a dispersion shifted fiber, a dispersion compensating fiber, a highly nonlinear fiber, or a highly nonlinear dispersion shifted fiber. The laser linewidth of the brillouin pumping light source 1 is less than 10 kHz. The line width of the output random laser is determined by the line width of the pump laser, so that the line width of the output random laser is narrower only when the line width of the laser of the brillouin pump light source 1 is smaller than 10kHz, and the frequency stability is improved. The length of the gain fiber 4 is not less than 1 km. If the length of the gain fiber 4 is too small, the pump laser cannot be gained, so the length of the gain fiber 4 is ensured to be not less than 1 km. The splitting ratio of coupler 8 is 50: 50. Since an excessive difference in the splitting ratio would render the optical path of the random fiber laser impossible, the value of the splitting ratio needs to be limited.
Referring to FIG. 2, a random fiber laser generation method, which can embody principles of the present application, is representatively illustrated in FIG. 2, including the steps of:
s001, generating Brillouin Stokes light: the brillouin pump light source 1 provides pump laser, which passes through the isolator 2 and enters the gain fiber 4 through the first circulator 3 to generate brillouin stokes light. The main purpose of this step is to produce brillouin stokes light, i.e. to produce random laser gain.
S002, providing random distributed feedback: the brillouin stokes light passes through the first and second circulators 3 and 5 in sequence and enters the stochastic grating array 61, the stochastic grating array 61 providing stochastic distributed feedback. The main purpose of this step is to provide random distributed feedback for the brillouin stokes light in order to narrow the line width and reduce the pump threshold power.
S003, power amplification is carried out on the random laser: the tunable optical amplifier 7 amplifies the power of the random laser light transmitted through the random grating array 61, and the faraday rotator mirror 62 reflects the random laser light after power amplification back to the tunable optical amplifier 7 for power amplification again. The step is to amplify the power of the random laser for the second time, so as to obviously reduce the pumping threshold power.
S004, leading out random laser: the random laser light passes through the random grating array 61 back into the second circulator 5 and is extracted through the coupler 8. This step is to extract the random laser after gain and feedback.
The random fiber laser generation method provided by the application has the beneficial effects that the method is consistent with the random fiber laser, in addition, the tunable optical amplifier 7 amplifies the power of the random laser transmitted through the random grating array 61, the Faraday rotator 62 reflects the random laser after power amplification back to the tunable optical amplifier 7, the power amplification is carried out again, the power of the random laser is amplified for the second time through the matching use of the Faraday rotator 62 and the tunable optical amplifier 7, and the pumping threshold power can be obviously reduced.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A random fiber laser generation method, based on a random fiber laser, the random fiber laser comprising;
a Brillouin pumping light source (1) for providing pumping laser light;
a gain fiber (4) connected with the Brillouin pumping light source (1) through a connecting component to form a gain optical path, wherein the gain optical path is used for transmitting pumping laser to the gain fiber (4) and transmitting Brillouin Stokes light generated by the gain fiber (4) to the connecting component;
the random distributed feedback component (6) is connected with the gain fiber (4) through a connecting component to form a feedback optical path, is used for transmitting Brillouin Stokes light to the random distributed feedback component (6) and providing random distributed feedback, and transmits the fed-back random laser back to the connecting component and outputs the random laser;
the gain optical path and the feedback optical path are independent of each other;
the random fiber laser generation method comprises the following steps:
s001, gain optical path: the Brillouin pump light source (1) provides pump laser, the pump laser sequentially passes through the isolator (2) and the first circulator (3) and enters the gain fiber (4) to generate Brillouin Stokes light, and the Brillouin Stokes light enters the second circulator (5) through the first circulator (3) to form a gain light path;
s002, feedback optical path: brillouin Stokes light enters the random grating array (61) through the second circulator (5), the random grating array (61) provides random distributed feedback to form random laser, the tunable optical amplifier (7) performs power amplification on the random laser transmitted through the random grating array (61), the Faraday rotator (62) reflects the random laser after power amplification back to the tunable optical amplifier (7), power amplification is performed again, the random laser after power amplification again sequentially passes through the Faraday rotator (62), the tunable optical amplifier (7), the random grating array (61), the second circulator (5) and the coupler (8) and is led out through the coupler (8) to form a feedback optical path mutually independent from the gain optical path.
2. A random fibre laser generation method as claimed in claim 1, wherein the joining assembly comprises a first circulator (3) and a second circulator (5):
the first circulator (3) is respectively connected with the Brillouin pumping light source (1), the gain optical fiber (4) and the second circulator (5) to form the gain optical path;
the second circulator (5) is also connected with the random distributed feedback component (6) to form the feedback optical path.
3. A random fiber laser generation method as claimed in claim 2, wherein said random distributed feedback assembly (6) comprises:
a stochastic grating array (61) connected to the second circulator (5) for providing stochastic distributed feedback for the Brillouin Stokes light;
a Faraday rotator mirror (62) connected to the stochastic grating array (61) for reflecting the stochastic laser light transmitted through the stochastic grating array (61) back to the second circulator (5).
4. A method of random fiber laser generation according to claim 3, further comprising a tunable optical amplifier (7), wherein said tunable optical amplifier (7) is connected to said random grating array (61) and said faraday rotator mirror (62), respectively.
5. A random fiber laser generation method as claimed in claim 2, further comprising an isolator (2): the Brillouin pump light source (1) and the first circulator (3) are respectively connected.
6. A random fiber laser generation method as claimed in claim 2, further comprising a coupler (8): the second circulator (5), the gain fiber (4) and the air connector are respectively connected;
the splitting ratio of the coupler (8) is 50: 50.
7. A method of random fiber laser generation as claimed in claim 1, wherein said gain fiber (4) is a single mode fiber, a dispersion shifted fiber, a dispersion compensating fiber, a highly nonlinear fiber or a highly nonlinear dispersion shifted fiber.
8. A method for random fiber laser generation according to any of claims 1-7, wherein the length of the gain fiber (4) is not less than 1 km.
9. A random fiber laser generation method according to any of claims 1-7, wherein the laser linewidth of the Brillouin pump light source (1) is less than 10 kHz.
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| CN202011363226.XA CN112582866B (en) | 2020-11-27 | 2020-11-27 | Random fiber laser and random fiber laser generation method |
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| CN202011363226.XA CN112582866B (en) | 2020-11-27 | 2020-11-27 | Random fiber laser and random fiber laser generation method |
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| CN112582866B true CN112582866B (en) | 2022-07-26 |
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