CN113437625A - Brillouin random fiber laser based on dynamic grating - Google Patents

Brillouin random fiber laser based on dynamic grating Download PDF

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CN113437625A
CN113437625A CN202110510811.6A CN202110510811A CN113437625A CN 113437625 A CN113437625 A CN 113437625A CN 202110510811 A CN202110510811 A CN 202110510811A CN 113437625 A CN113437625 A CN 113437625A
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random
fiber
cavity
laser
brillouin
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张亮
裘增欢
肖哲澜
张吉临
谢浩然
蒋义坤
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University of Shanghai for Science and 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • 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
    • H01S3/06716—Fibre compositions or doping with active elements
    • 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
    • H01S3/30—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

Abstract

The invention discloses a dynamic grating-based Brillouin random fiber laser, which integrally adopts a structure of a semi-open fiber ring cavity and comprises a semi-open ring random cavity and a rare earth doped fiber dynamic grating structure embedded in the semi-open ring random cavity. The random fiber laser integrally adopts a semi-open ring cavity structure, the pump light generates a stimulated Brillouin scattering effect in a fiber medium to realize amplification gain of backward Stokes light, random laser oscillation is realized by introducing a distributed random feedback mechanism, a dynamic grating structure formed by rare earth doped fibers is added in a random fiber cavity to dynamically regulate and control the mode of random laser, the problems of mode hopping and frequency instability of a Brillouin random fiber laser mode are solved, and the application competitiveness of the Brillouin random fiber laser in the aspects of fiber communication, sensing and the like is improved.

Description

Brillouin random fiber laser based on dynamic grating
Technical Field
The invention relates to the field of optical fiber lasers, in particular to a dynamic grating-based Brillouin random optical fiber laser direction, mainly solves the problems of mode hopping and frequency instability of a random laser mode of a Brillouin random optical fiber laser by using a rare earth-doped optical fiber dynamic grating structure, and enhances the practical application value of the Brillouin random optical fiber laser in the fields of optical fiber communication, optical fiber sensing and the like.
Background
The random fiber laser has great application prospect in the aspects of fiber communication and fiber sensing due to the unique noise and coherence characteristics. Compared with the traditional resonant cavity fiber laser, the random fiber laser does not have a fixed mirror feedback type optical resonant cavity for mode selection, and adopts distributed random feedback to realize laser oscillation. The Brillouin random fiber laser adopts the Brillouin scattering effect in the optical fiber as laser gain, can realize ultra-narrow linewidth random laser of dozens of hertz, and although random feedback inhibits multiple longitudinal modes of the traditional fixed cavity structure, random modes with certain probability and quantity exist in an output laser mode, mode competition and instability and additive intensity noise caused by the mode competition inevitably exist among the random modes, so that the practical application of the Brillouin random fiber laser is fundamentally limited.
The prior art [1] (see Mengpang, optics letters37,3129-3131,2012) studies the influence of the fully-open random cavity on the stimulated Brillouin scattering effect by using different types of gain fibers, and the gain fibers and the random feedback part have the same structure, but the frequency stability of the output random laser is poor although the structure is simple.
The prior art [2] (see PingHuang, LaserPhysics30,035101,2020) establishes a multi-wavelength Brillouin fiber random laser by using a circulator and a coupler structure at one end on the basis of a fully-open cavity, combines the gain of an erbium-doped fiber on the basis of the Brillouin gain to effectively improve the order and the power of output Stokes laser, and has the defect of frequency stability.
Accordingly, those skilled in the art have endeavored to develop a high frequency stable brillouin random fiber laser.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to overcome the defects in the prior art, and provides a brillouin random fiber laser based on a dynamic grating, so that the problems of mode hopping and frequency stability of output laser of the brillouin random fiber laser are solved, the stability of the output laser is optimized, and the practical value of the brillouin random fiber laser is further improved.
In order to achieve the purpose of the invention, the invention adopts the following inventive concept:
the basic idea of the invention is to add a dynamic grating structure composed of rare earth doped fiber in the Brillouin random fiber laser to realize laser mode selection and regulation.
The semi-open ring cavity structure comprises a section of long optical fiber as a Brillouin gain medium, the pumped light injected into the semi-open ring cavity structure generates a stimulated Brillouin scattering effect after reaching a Brillouin threshold value, Stokes light transmitted in opposite directions to the pumped light is generated and amplified, the frequency difference between the Stokes light and the Stokes light is described as Brillouin frequency shift, a random feedback structure is introduced into an output end of a Stokes laser, backward distributed random feedback is provided and enters a fiber random cavity through a circulator, and random laser oscillation is achieved.
The dynamic grating structure added in the random cavity forms a stable standing wave light field in the random cavity by using a coupler or a reflector structure, so that the periodic distribution of light intensity in the rare earth doped fiber is realized. Because of the saturated absorption effect, the axial absorption coefficient and the refractive index of the unpumped rare earth doped fiber also have periodic changes at the moment, which is equivalent to a self-written dynamic fiber grating narrow-band filter, and the central wavelength of the dynamic grating automatically tracks and is stabilized in a laser mode with the highest light intensity. Thanks to the narrow bandwidth of the dynamic grating, which is related to the length and doping concentration of the rare-earth doped fiber, the random lasing modes outside the bandwidth are suppressed and the final laser frequency is stabilized at the central strongest frequency.
According to the inventive concept, the invention adopts the following technical scheme:
a Brillouin random fiber laser based on dynamic grating integrally adopts a structure of a semi-open fiber ring cavity, and comprises a semi-open ring random cavity and a rare earth doped fiber dynamic grating structure embedded in the semi-open ring random cavity.
Preferably, the adopted pump light of the semi-open annular random cavity is generated by an original laser, is amplified by the optical fiber amplifier and enters the semi-open random cavity through the ports from the first port to the second port of the circulator.
Preferably, the semi-open annular random cavity and the semi-open annular cavity structure comprise a first circulator and a second circulator, and the light transmitted in the semi-open annular random cavity can only be conducted from the port I to the port II and from the port II to the port III in a single direction, so that the Stokes laser in the cavity cannot pass through the port III to the port I of the second circulator and the port III to the port II of the first circulator to form a traditional closed annular resonant cavity.
Preferably, the semi-open ring cavity structure includes a section of optical fiber as a brillouin gain optical fiber, the pump light injected into the semi-open ring cavity structure generates a stimulated brillouin scattering effect after reaching a brillouin threshold, and generates Stokes light which is transmitted in the same direction as the original pump light, and a frequency difference between the two is described as brillouin frequency shift, and satisfies a relation:
Figure BDA0003060304840000021
wherein n ispIs the effective refractive index, v, of the Brillouin gain fiberAIs the propagation velocity of the acoustic wave, λPIs the wavelength of the brillouin pump light, and c is the propagation speed of light in vacuum.
Preferably, the output end of the semi-open annular random cavity comprises a random feedback providing structure which provides backward random feedback and enters the random cavity through ports two to three of the second circulator to realize laser oscillation.
Preferably, the semi-open ring-shaped random cavity and the output end comprise an isolator to reduce interference of Fresnel reflection of the output end face on the random cavity.
Preferably, the rare earth doped fiber dynamic grating structure realizes the periodic distribution of light intensity in the rare earth doped fiber when two light fields transmitted in opposite directions form stable standing waves in a section of the rare earth doped fiber; due to the existence of the saturated absorption effect, the axial absorption coefficient and the refractive index of the unpumped rare earth doped fiber also have periodic changes, the optical fiber is equivalent to a self-written dynamic fiber grating structure and is equivalent to a narrow-band filter, and the central wavelength of the narrow-band filter depends on the wavelength of the strongest laser mode of an input optical field.
Preferably, the rare earth doped fiber dynamic grating structure has a bandwidth of a dynamic grating formed by using a rare earth doped fiber, which is related to the length and doping concentration of the rare earth doped fiber.
Preferably, the performance of the laser is optimized by optimizing the length and kind of the medium gain fiber of the random cavity and the type of the random feedback structure; the output frequency stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure, wherein the type, doping concentration and length parameters of the rare earth doped fiber.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the invention optimizes the performance of the Brillouin random laser by optimizing the length and the type of the gain optical fiber in the random cavity and the type of the random feedback structure; the output stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure, wherein the parameters such as the type, the doping concentration, the length and the like of the rare earth doped fiber;
2. according to the Brillouin random fiber laser based on the rare earth doped fiber dynamic grating, the dynamic grating structure consisting of the rare earth doped fiber is introduced into the semi-open random cavity, so that the problems of random mode hopping in output random laser and frequency instability and additive intensity noise caused by the random mode hopping are effectively inhibited, the stability of the output random laser is optimized, and the practical value of the Brillouin random fiber laser is further improved;
3. the laser provided by the invention can be used for inhibiting the problems of mode hopping and frequency instability of the Brillouin random fiber laser mode, and improving the application competitiveness of the Brillouin random fiber laser in the aspects of fiber communication, sensing and the like.
Drawings
Fig. 1 is a system diagram of a single-mode fiber and device of a brillouin random fiber laser based on an erbium-doped fiber dynamic grating according to the present invention.
Fig. 2 is a system diagram of a polarization maintaining fiber and device of the present invention, showing a brillouin random fiber laser based on an erbium-doped fiber dynamic grating.
FIG. 3 shows three typical structures of the rare-earth doped fiber dynamic grating used in the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the accompanying drawings described below. The invention may be embodied in many different forms of embodiment and the scope of the invention is not limited to the embodiments set forth herein.
The dynamic grating structure added in the random cavity forms a stable standing wave light field in the random cavity by using a coupler or a reflector structure, so that the periodic distribution of light intensity in the rare earth doped fiber is realized. Due to the existence of the saturated absorption effect, the axial absorption coefficient and the refractive index of the unpumped rare earth doped fiber also have periodic changes, which is equivalent to a self-written dynamic fiber grating narrow-band filter, and the selection and the regulation of a random laser mode are realized. The performance of the random laser is optimized by optimizing the length and the type of a gain fiber in the random cavity and the type of a random feedback structure; the output stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure comprising the type, doping concentration and length parameters of the rare earth doped fiber.
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this embodiment, referring to fig. 1, a dynamic grating-based brillouin random fiber laser integrally adopts a structure of a semi-open fiber ring cavity, including a semi-open ring random cavity and a rare earth doped fiber dynamic grating structure embedded therein.
In the embodiment, a dynamic grating structure formed by rare earth doped fibers is added in the Brillouin random fiber laser to realize laser mode selection and regulation.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in this embodiment, the adopted pump light of the semi-open ring random cavity is generated by the original laser 1, amplified by the fiber amplifier 2, and enters the semi-open random cavity through the ports from the first port to the second port of the circulator 3.
In this embodiment, the semi-open ring random cavity and the semi-open ring cavity structure comprise a first circulator 3 and a second circulator 6, and because the light transmitted in the semi-open ring random cavity can only be conducted from the port I to the port II and from the port II to the port III in a single direction, the Stokes laser in the cavity cannot pass through the port III to the port I of the second circulator 6 and the port III to the port II of the first circulator 3 to form a traditional closed ring-shaped resonant cavity.
In this embodiment, the semi-open ring cavity structure includes a section of optical fiber 4 as a brillouin gain optical fiber, the pump light injected into the semi-open ring cavity structure generates a stimulated brillouin scattering effect after reaching a brillouin threshold, and generates Stokes light which is transmitted in the same direction as the original pump light, and a frequency difference between the two is described as brillouin frequency shift, and satisfies a relation:
Figure BDA0003060304840000041
wherein n ispIs the effective refractive index, v, of the Brillouin gain fiberAIs the propagation velocity of the acoustic wave, λPIs the wavelength of the brillouin pump light, and c is the propagation speed of light in vacuum.
In this embodiment, the output end of the semi-open ring-shaped random cavity includes a random feedback providing structure for providing backward random feedback and entering the random cavity through ports two to three of the second circulator 6 to realize laser oscillation.
In this embodiment, the semi-open ring-shaped random cavity and the output end comprise an isolator 8 to reduce the interference of Fresnel reflection on the random cavity by the output end face.
In this embodiment, when two optical fields transmitted in opposite directions form a stable standing wave in a section of rare-earth doped fiber, the rare-earth doped fiber dynamic grating structure realizes the periodic distribution of light intensity in the rare-earth doped fiber; due to the existence of the saturated absorption effect, the axial absorption coefficient and the refractive index of the unpumped rare earth doped fiber also have periodic changes, the optical fiber is equivalent to a self-written dynamic fiber grating structure and is equivalent to a narrow-band filter, and the central wavelength of the narrow-band filter depends on the wavelength of the strongest laser mode of an input optical field.
In this embodiment, the bandwidth of the dynamic grating formed by the rare-earth doped fiber is related to the length and doping concentration of the rare-earth doped fiber.
In the embodiment, the performance of the laser is optimized by optimizing the length and the type of the middle gain fiber of the random cavity and the type of the random feedback structure; the output frequency stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure, wherein the type, doping concentration and length parameters of the rare earth doped fiber.
In the embodiment, the performance of the brillouin random laser is optimized by optimizing the length and the type of the gain fiber in the random cavity and the type of the random feedback structure; the output stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure, wherein the parameters such as the type, the doping concentration, the length and the like of the rare earth doped fiber; in the embodiment, the dynamic grating structure composed of the rare earth doped fiber is introduced into the semi-open random cavity of the brillouin random fiber laser based on the rare earth doped fiber dynamic grating, so that the problems of random mode hopping in the output random laser and frequency instability and additive intensity noise caused by the random mode hopping are effectively inhibited, the stability of the output random laser is optimized, and the practical value of the brillouin random fiber laser is further improved.
Example three:
this embodiment is substantially the same as the above embodiment, and is characterized in that:
in this embodiment, a single-mode system structure is shown in fig. 1. The adopted pump light is generated by a laser 1 with the central wavelength of 1550nm and the line width of 20kHz, is amplified by an optical fiber amplifier 2, and then enters a semi-open random cavity from a port I to a port II of a circulator 3. The semi-open ring cavity structure comprises a single-mode fiber 4 with the length of 10km as a gain fiber, and the pump light injected into the gain fiber generates a stimulated Brillouin scattering effect after reaching a Brillouin threshold value, so that Stokes light which is transmitted in the direction of the original pump light is generated. The Stokes light transmitted reversely realizes single random mode laser through the dynamic grating structure 5, improves the frequency stability of the laser, and is output from the port I to the port II of the circulator 6. Meanwhile, the output end comprises a section of 5km single-mode fiber 7 serving as a random feedback fiber, backward random feedback is provided, and the backward random feedback enters a random cavity through ports II to III of a circulator 6, so that random laser oscillation is realized. Due to the one-way conduction characteristic of the circulator, Stokes light transmitted in the cavity cannot pass through the port III to the port I of the circulator 6 and the port III to the port II of the circulator 3 to form a traditional closed ring-shaped resonant cavity, and multi-longitudinal-mode oscillation is avoided. Finally, the output of the laser contains an isolator 8 to reduce the fresnel reflection at the output facet from the cavity.
The structure of the polarization maintaining fiber system is shown in fig. 2. Compared with a single-mode optical fiber structure, the polarization-maintaining structure integrally adopts the polarization-maintaining optical fiber and the polarization-maintaining optical fiber device to realize the linear polarization matching of the pump light and the Stokes light, and improve the Brillouin gain and the frequency stability of laser output. The general comprises: a 1550nm narrow linewidth laser 1; an optical fiber amplifier 2; a polarization maintaining circulator 3; 1km of polarization maintaining fiber 4; a polarization maintaining dynamic grating structure 5; a polarization maintaining circulator 6; a weak fiber grating string 7; an isolator 8; a polarization controller 9; a polarizing beam splitter 10. The polarization controller and the polarization beam splitter are used for converting the amplified pump light into linearly polarized light to be injected into the polarization-maintaining fiber random cavity, and the random fiber grating serving as a random feedback structure can provide stronger random feedback to excite and generate random laser.
The typical structure of the erbium-doped fiber dynamic grating used is shown in fig. 3. Stokes light generated in the random cavities in the structure [1] and the structure [2] enters the erbium-doped fiber 14 through the ports from the first port to the second port of the circulator 11, and the processed Stokes light returns to the semi-open random cavity again from the ports from the second port to the third port of the circulator 11. The structure [3] directly uses the coupler to perform light splitting and input and output. The structures [1] and [3] use a coupler 12 with a 1:1 splitting ratio, and the structure [2] uses a mirror 15 to provide reflected light. In practice, a 10m long erbium doped fiber 9 is used to form a dynamic grating.
The Brillouin random fiber laser based on the dynamic grating comprises the rare earth doped fiber, and the whole structure of the semi-open fiber ring cavity is adopted, and comprises the semi-open ring random cavity and the rare earth doped fiber dynamic grating structure embedded in the semi-open ring random cavity. The random fiber laser adopts a semi-open ring cavity structure as a whole, the pump light generates a stimulated Brillouin scattering effect in a fiber medium to realize amplification gain of backward Stokes light, random laser oscillation is realized by introducing a distributed random feedback mechanism, and a dynamic grating structure formed by rare earth doped fibers is added in a random fiber cavity to dynamically regulate and control the mode of random laser. When two beams of co-frequency optical fields transmitted in opposite directions form stable standing waves in the rare earth doped optical fiber, the periodic distribution of light intensity is formed. Due to the existence of the saturated absorption effect, the axial absorption coefficient and the refractive index in the unpumped rare earth doped fiber correspondingly generate periodic modulation at the moment, the optical fiber is equivalent to a self-written dynamic fiber grating narrow-band filter, and the center frequency of the optical fiber grating narrow-band filter automatically tracks the strongest Stokes laser mode, so that the problems of mode hopping and frequency instability of the Brillouin random fiber laser mode are solved, and the application competitiveness of the Brillouin random fiber laser in the aspects of fiber communication, sensing and the like is improved.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, as long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the present invention.

Claims (9)

1. A Brillouin random fiber laser based on dynamic grating is characterized in that: the whole structure adopts a semi-open fiber ring cavity structure, and comprises a semi-open ring random cavity and a rare earth doped fiber dynamic grating structure embedded in the semi-open ring random cavity.
2. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the semi-open annular random cavity adopts pump light generated by an original laser (1), is amplified by an optical fiber amplifier (2) and then enters the semi-open random cavity from a port I to a port II of a circulator (3).
3. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the semi-open annular random cavity comprises a first circulator (3) and a second circulator (6), and the light transmitted in the semi-open annular random cavity can only be conducted from the port I to the port II and from the port II to the port III in a one-way mode due to the characteristics of the circulators, so that Stokes laser in the cavity cannot pass through the port III to the port I of the second circulator (6) and the port III to the port II of the first circulator (3) to form a traditional closed annular resonant cavity.
4. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the semi-open ring cavity structure comprises a section of optical fiber (4) serving as a Brillouin gain optical fiber, the pump light injected into the semi-open ring cavity structure generates a stimulated Brillouin scattering effect after reaching a Brillouin threshold value, Stokes light transmitted in the direction opposite to the original pump light is generated, the frequency difference between the pump light and the original pump light is described as Brillouin frequency shift, and the relation is satisfied:
Figure FDA0003060304830000011
wherein n ispIs the effective refractive index, v, of the Brillouin gain fiberAIs the propagation velocity of the acoustic wave, λPIs the wavelength of the brillouin pump light, and c is the propagation speed of light in vacuum.
5. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the output end of the semi-open annular random cavity comprises a random feedback providing structure which provides backward random feedback and enters the random cavity through the ports II to III of the second circulator (6) to realize laser oscillation.
6. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the output end of the semi-open annular random cavity comprises an isolator (8) to reduce the interference of Fresnel reflection of the output end face to the random cavity.
7. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: when two light fields transmitted oppositely form stable standing waves in a section of rare earth doped fiber, the rare earth doped fiber dynamic grating structure realizes the periodic distribution of light intensity in the rare earth doped fiber; due to the existence of the saturated absorption effect, the axial absorption coefficient and the refractive index of the unpumped rare earth doped fiber also have periodic changes, the optical fiber is equivalent to a self-written dynamic fiber grating structure and is equivalent to a narrow-band filter, and the central wavelength of the narrow-band filter depends on the wavelength of the strongest laser mode of an input optical field.
8. The dynamic grating-based brillouin random fiber laser of claim 1, wherein: the rare earth doped optical fiber dynamic grating structure utilizes the bandwidth of a dynamic grating formed by the rare earth doped optical fiber to be related to the length and the doping concentration of the rare earth doped optical fiber.
9. A dynamic grating based brillouin random fibre laser as claimed in any one of claims 1 to 8, wherein: optimizing the performance of the laser by optimizing the length and the type of a gain fiber in the random cavity and the type of a random feedback structure; the output frequency stability of the random fiber laser is improved by selecting a proper dynamic grating typical structure, wherein the type, doping concentration and length parameters of the rare earth doped fiber.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9276373B1 (en) * 2013-09-20 2016-03-01 University Of Ottawa Frequency stabilized coherent brillouin random fiber laser
CN109713562A (en) * 2019-01-24 2019-05-03 太原理工大学 Random fiber laser based on random Brillouin's dynamic raster

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9276373B1 (en) * 2013-09-20 2016-03-01 University Of Ottawa Frequency stabilized coherent brillouin random fiber laser
CN109713562A (en) * 2019-01-24 2019-05-03 太原理工大学 Random fiber laser based on random Brillouin's dynamic raster

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIANG ZHANG ET AL.: "Long-distance Superluminal Propagation Using a Single-longitudinal-mode Long-cavity Brillouin Fiber Laser", 《IEEE XPLORE》 *
ZICHAO ZHOU ET AL.: "High efficiency brillouin random fiber laser with replica symmetry breaking enabled by random fiber grating", 《OPTICS EXPRESS》 *

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