CN108418086B - All-fiber high-order mode Brillouin fiber laser - Google Patents

All-fiber high-order mode Brillouin fiber laser Download PDF

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CN108418086B
CN108418086B CN201810348684.2A CN201810348684A CN108418086B CN 108418086 B CN108418086 B CN 108418086B CN 201810348684 A CN201810348684 A CN 201810348684A CN 108418086 B CN108418086 B CN 108418086B
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fiber
optical fiber
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optical
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CN108418086A (en
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甘久林
衡小波
杨中民
张智深
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South China University of Technology SCUT
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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
    • H01S3/06791—Fibre ring lasers
    • 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
    • H01S3/06712—Polarising fibre; Polariser
    • 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
    • H01S3/05—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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • 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
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • 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
    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

The invention discloses an all-fiber high-order mode Brillouin fiber laser which has an annular cavity structure and comprises a narrow linewidth pump laser, an optical amplifier, a first polarization controller, an optical fiber circulator, a first optical fiber mode selection coupler, a second polarization controller, a single-mode optical fiber, a few-mode optical fiber and a second optical fiber mode selection coupler; the first optical fiber mode selection coupler and the second optical fiber mode selection coupler are cavity mode conversion devices, can realize directional selection coupling of a specific high-order mode in a fundamental transverse mode and a few-mode optical fiber in a single-mode optical fiber, and realize resonance amplification of a high-order mode in a cavity based on Brillouin nonlinear gain of the few-mode optical fiber in an annular cavity, and directly output high-order mode laser. The high-order mode laser output by the invention has good stability and high mode purity, adopts an all-fiber structure, has compact structure and low cost, is easy to integrate with a fiber system, and improves the practicability and reliability of the high-order mode laser.

Description

All-fiber high-order mode Brillouin fiber laser
Technical Field
The invention relates to the field of optical fiber lasers and optical communication, in particular to an all-fiber high-order mode Brillouin optical fiber laser.
Background
High-order mode lasers have a wide application prospect and are attracting more and more interest due to their unique spatial intensity, phase and polarization distribution. For example, in the field of optical communications, information is modulated on several different higher order modes, i.e., mode division multiplexing techniques, which can significantly increase the transmission capacity in optical communications. In the field of optical fiber sensing, higher temperature and strain resolution accuracy can be achieved by the higher-order mode. In addition, vortex laser changed from high-order mode has great potential in quantum and nano optics, optical manipulation, super-resolution imaging, laser material treatment and other aspects.
With the push of these applications, researchers have proposed a number of methods to generate higher-order mode lasers. Currently, lasers that produce high-order mode lasers can be broadly divided into two categories: bulk element solid state lasers and all-fiber lasers. Compared with the former, the all-fiber laser has the advantages of low cost, good flexibility, good stability, small volume, high efficiency and the like. The key components for realizing the all-fiber laser are high-efficiency all-fiber mode conversion or selection devices, including a dislocation coupling technology, a few-mode fiber Bragg grating, a long-period fiber grating and a mode selection coupler. The layout of these mode-converting or selecting devices in all-fiber lasers can be divided into two categories. The first type, the device, is placed outside the cavity and cascaded in the output optical path of the fundamental transverse mode (LP 01) laser. The second type, the device is placed in a laser resonator containing a single-mode gain medium. Strictly speaking, however, these two types of lasers are still fundamental transverse mode resonant amplification, rather than the desired higher order mode resonant amplification. In addition, because of device imperfections, both of these arrangements can also lead to beam power and quality degradation, with low purity of the output higher order modes. Therefore, it is important to realize a high-efficiency, all-fiber and low-cost method to obtain a high-purity, high-stability and compact high-order mode laser.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides an all-fiber high-order mode Brillouin fiber laser, which is based on the Brillouin nonlinear effect, takes a passive few-mode fiber as a gain medium, realizes intracavity high-order mode resonance amplification, and directly obtains high-mode-purity high-order mode laser at the output end of the laser. In addition, the laser has the advantages of compact structure, simple and convenient adjustment, low manufacturing cost, high stability and the like.
The aim of the invention is achieved by the following technical scheme: an all-fiber high-order mode brillouin fiber laser, comprising: the system comprises a narrow linewidth pump laser, an optical amplifier, a first polarization controller, an optical fiber circulator, a first optical fiber mode selection coupler, a second polarization controller, a single-mode optical fiber, a few-mode optical fiber and a second optical fiber mode selection coupler;
the narrow linewidth pump laser is connected to an optical amplifier through a single-mode fiber, the optical amplifier is connected to the first port of the optical fiber circulator through a single-mode fiber, the second port of the optical fiber circulator is connected to the first port of a first optical fiber mode selection coupler through a single-mode fiber, the third port of the optical fiber circulator is connected to the first port of a second optical fiber mode selection coupler through a single-mode fiber, and the second port of the first optical fiber mode selection coupler is connected to the second port of the second optical fiber mode selection coupler through a few-mode fiber to form an annular cavity structure; the first polarization controller is added on a single-mode optical fiber of which the optical amplifier is connected with a first port of the optical fiber circulator, and the second polarization controller is added on a few-mode optical fiber of which a second port of the first optical fiber mode selection coupler is connected with a second port of the second optical fiber mode selection coupler; and the third port of the first optical fiber mode selection coupler outputs laser.
Preferably, the narrow linewidth pump laser can be a narrow linewidth semiconductor laser or a narrow linewidth fiber laser with tunable C-band power, and the linewidth is lower than 1MHz.
Preferably, the optical amplifier can be a high-gain erbium-doped optical fiber amplifier or a 1550 nm-band semiconductor optical amplifier.
Preferably, the tail fibers of the three ports of the optical fiber circulator are common communication single-mode optical fibers, and the length range of each port single-mode optical fiber is 0.1m to 1m.
Preferably, the few-mode optical fiber is 1550 nm-band few-mode optical fiber, the number of supported modes is more than 2, and the length is more than 20m.
Preferably, the first optical fiber mode selection coupler and the second optical fiber mode selection coupler are 2×2 couplers made of single-mode optical fibers and few-mode optical fibers by fusion tapering, so that directional selection coupling between a fundamental transverse mode in the single-mode optical fibers and a specific higher-order mode in the few-mode optical fibers can be realized, the first port and the fourth port are single-mode optical fibers, and the second port and the third port are few-mode optical fibers.
The optical fiber laser is of an annular cavity structure, the annular cavity comprises an optical fiber circulator, two optical fiber mode selection couplers, and a single mode optical fiber and a few mode optical fiber for connection, wherein the few mode optical fiber for connecting the two optical fiber mode selection couplers accounts for more than 99% of the length of the whole annular cavity. The first optical fiber mode selection coupler and the second optical fiber mode selection coupler are cavity mode conversion devices, can realize directional selection coupling of a specific high-order mode in a fundamental transverse mode and a few-mode optical fiber in a single-mode optical fiber, realize resonance amplification of a high-order mode in a cavity based on stimulated Brillouin nonlinear gain of the few-mode optical fiber in an annular cavity, and generate stable high-purity high-order mode Brillouin laser at room temperature.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention uses the optical fiber mode selection coupler as the mode conversion device in the laser resonant cavity, and has small loss and high efficiency.
2. The invention realizes the resonant amplification in the high-order mode cavity based on the Brillouin nonlinear gain, and the purity of the obtained high-order mode laser mode is high.
3. The invention uses the common commercial passive few-mode optical fiber as the gain medium, is convenient to obtain and is easy to popularize and use.
4. The invention adopts an all-fiber structure, has simple and compact structure, low cost, simple and convenient adjustment, easy integration of a fiber system, good stability of output laser, narrow line width and improvement of the practicability and reliability of the high-order mode laser.
Drawings
Fig. 1 is a schematic diagram of an embodiment of an all-fiber high-order mode brillouin fiber laser.
Fig. 2 is a graph of laser power.
FIG. 3 is a graph of the pump laser and output Brillouin Stokes laser spectra.
Fig. 4 is a graph of the far-field light intensity profile of the output laser.
In fig. 1: 1-a narrow linewidth pump laser; a 2-optical amplifier; 3-a first polarization controller; 4-optical fiber circulator; 5-a first fiber mode selection coupler; 6-a second polarization controller; 7-few-mode optical fiber; 8-a second fiber mode selection coupler.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1, an all-fiber high-order mode brillouin fiber laser of the present example includes: the optical fiber comprises a narrow linewidth pump laser 1, an optical amplifier 2, a first polarization controller 3, an optical fiber circulator 4, a first optical fiber mode selection coupler 5, a second polarization controller 6, a few-mode optical fiber 7 and a second optical fiber mode selection coupler 8.
The laser output by the narrow linewidth pump laser 1 is amplified by the amplifier 2, the amplified high-power pump light is injected into the first port 401 of the optical fiber circulator 4, then is injected into the first port 501 of the first optical fiber mode selection coupler 5 from the second port 402 of the optical fiber circulator 4, after passing through the first optical fiber mode selection coupler 5, the pump light is converted from the fundamental transverse mode of the single mode optical fiber in the first port 501 into the specific high-order mode of the few-mode optical fiber in the second port 502 of the first optical fiber mode selection coupler 5, and the generated high-order mode pump light is injected into the few-mode optical fiber 7 through the second port 502 of the first optical fiber mode selection coupler 5. When the pump light power amplified by the optical amplifier 2 exceeds the brillouin threshold of the few-mode optical fiber 7, stimulated brillouin scattering effect occurs, and brillouin stokes light is generated in the reverse direction. The brillouin stokes light generated in the few-mode optical fiber 7 enters the few-mode optical fiber 7 again through the first port 501 of the first optical fiber mode selection coupler 5, the second port 402 of the optical fiber circulator 4, the third port 403 of the optical fiber circulator 4, the first port 801 of the second optical fiber mode selection coupler 8 and the second port 802 of the second optical fiber mode selection coupler 8 in sequence, and forms oscillation in the resonant cavity, that is, generates first-order brillouin stokes light which is lower than the frequency of the pump light, and the first-order brillouin stokes light is output through the third port 503 of the first optical fiber mode selection coupler 5.
The first polarization controller 3 between the optical amplifier 2 and the first port 401 of the optical fiber circulator 4 and the second polarization controller 6 between the second port 502 of the first optical fiber mode selection coupler 5 and the second port 802 of the second optical fiber mode selection coupler 8 jointly control the polarization states of the pump light and the brillouin pump light to obtain the maximum brillouin nonlinear gain.
The tail fibers (connecting fibers) of the narrow linewidth pump laser 1, the optical amplifier 2, the fiber circulator 4, the first port 501 and the fourth port 504 of the first fiber mode selection coupler 5, and the first port 801 and the fourth port 804 of the second fiber mode selection coupler 8 are all common communication single mode fibers. Because of the first fiber mode selection coupler 5 and the second fiber mode selection coupler 8 in the fiber loop, the directional selection coupling of the fundamental transverse mode in the single mode fiber and the specific high-order mode in the few-mode fiber 7 can be realized, so that the specific high-order mode in the few-mode fiber 7 is resonant amplified, and the high-mode laser with high mode purity is obtained at the third output end 503 of the first fiber mode selection coupler 5.
The narrow linewidth pump laser can be a narrow linewidth semiconductor laser or a narrow linewidth optical fiber laser with tunable C-band power, and the linewidth is lower than 1MHz.
The optical amplifier can be a high-gain erbium-doped optical fiber amplifier or a 1550nm band semiconductor optical amplifier.
The tail fibers of the three ports of the optical fiber circulator are common communication single-mode optical fibers, and the length range of each port single-mode optical fiber is 0.1m to 1m.
The few-mode optical fiber is 1550 nm-band few-mode optical fiber, the number of supported modes is more than 2 modes, and the length is more than 20m.
Example 2
An all-fiber high-order mode Brillouin fiber laser has a structure schematically shown in figure 1. The narrow linewidth pump laser 1 adopts 1550nm wave band narrow linewidth single frequency optical fiber laser, the linewidth is 10kHz, and the laser power is 30mW. The optical amplifier 2 adopts a commercial 1550nm wave band semiconductor optical amplifier, and the amplifying power can reach 5W. The fiber circulator 4 adopts a commercial three-port single-mode fiber circulator. The first optical fiber mode selection coupler 5 and the second optical fiber mode selection coupler 8 are both 2×2 couplers manufactured by common communication single-mode optical fibers SMF-28e and commercial two-mode step optical fibers by fusion tapering, and the conversion efficiency from the LP01 mode in the single-mode optical fibers to the LP11 mode in the two-mode step optical fibers is 90%. The single mode optical fibers in the optical path are SMF-28e optical fibers. The length of the two-mode step optical fiber in the annular cavity is 50m, and the length of the single-mode optical fiber is 0.4m, so that the length of the two-mode step optical fiber accounts for 99.2%. The split ratio of the first port 501 and the third port 503 of the first fiber mode selection coupler 5 is 80:20.
When the amplified pump laser power is gradually increased to 780mW, the Brillouin Stokes light in the optical fiber annular cavity resonates. The pump power continues to increase and a stable laser output is obtained at the third port of the first fiber mode selective coupler. Fig. 2 is a graph of laser power with a slope efficiency of 15.6% and a laser output power of 350mW when the pump power is 3W. Fig. 3 is a spectrum diagram of the pump laser and the output brillouin stokes laser, the output brillouin laser being shifted in frequency by 10.9GHz with respect to the pump light. Fig. 4 is a diagram showing a far-field light intensity distribution of the LP11 mode laser output at the third port 503 of the first mode selection coupler 5.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (5)

1. An all-fiber high-order mode brillouin fiber laser, comprising: the system comprises a narrow linewidth pump laser, an optical amplifier, a first polarization controller, an optical fiber circulator, a first optical fiber mode selection coupler, a second polarization controller, a single-mode optical fiber, a few-mode optical fiber and a second optical fiber mode selection coupler;
the narrow linewidth pump laser is connected to an optical amplifier through a single-mode fiber, the optical amplifier is connected to the first port of the optical fiber circulator through a single-mode fiber, the second port of the optical fiber circulator is connected to the first port of a first optical fiber mode selection coupler through a single-mode fiber, the third port of the optical fiber circulator is connected to the first port of a second optical fiber mode selection coupler through a single-mode fiber, and the second port of the first optical fiber mode selection coupler is connected to the second port of the second optical fiber mode selection coupler through a few-mode fiber to form an annular cavity structure; the first polarization controller is added on a single-mode optical fiber of which the optical amplifier is connected with a first port of the optical fiber circulator, and the second polarization controller is added on a few-mode optical fiber of which a second port of the first optical fiber mode selection coupler is connected with a second port of the second optical fiber mode selection coupler; outputting laser from a third port of the first optical fiber mode selection coupler;
the first optical fiber mode selection coupler and the second optical fiber mode selection coupler are 2 multiplied by 2 couplers which are prepared by melting and tapering single-mode optical fibers and few-mode optical fibers, so that the directional selection coupling between a fundamental transverse mode in the single-mode optical fibers and a specific high-order mode in the few-mode optical fibers is realized, the first port and the fourth port are single-mode optical fibers, and the second port and the third port are few-mode optical fibers;
the all-fiber high-order mode Brillouin fiber laser is an annular cavity laser, wherein a few-mode fiber connected with two fiber mode selection couplers accounts for more than 99% of the length of the whole annular cavity.
2. The all-fiber high-order mode brillouin optical fiber laser according to claim 1, wherein the narrow linewidth pump laser is a narrow linewidth semiconductor laser or a narrow linewidth optical fiber laser with tunable C-band power, and the linewidth is lower than 1MHz.
3. The all-fiber high-order-mode brillouin fiber laser according to claim 1, wherein the optical amplifier is a high-gain erbium-doped fiber amplifier or a 1550 nm-band semiconductor optical amplifier.
4. The all-fiber high-order mode brillouin fiber laser according to claim 1, wherein the fiber circulator has three ports with tail fibers of common communication single mode fiber, and each port single mode fiber has a length ranging from 0.1m to 1m.
5. The all-fiber high-order-mode brillouin fiber laser according to claim 1, wherein the few-mode fiber is 1550 nm-band few-mode fiber, the number of supported modes is more than 2 modes, and the length is more than 20m.
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CN109066279B (en) * 2018-09-07 2024-03-26 华南理工大学 All-fiber vortex optical laser based on orbital angular momentum mode resonance
CN112117629A (en) * 2020-09-23 2020-12-22 上海大学 All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device
CN114069377B (en) * 2021-11-17 2023-12-26 上海大学 Mode control system based on acousto-optic device

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CN208723306U (en) * 2018-04-18 2019-04-09 华南理工大学 A kind of all -fiber high-order mode Brillouin optical fiber laser

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US7903696B2 (en) * 2008-12-31 2011-03-08 Ipg Photonics Corporation High-power narrowed-linewidth fiber laser system
US20110134940A1 (en) * 2009-12-08 2011-06-09 Schlumberger Technology Corporation Narrow linewidth brillouin laser
US8493555B2 (en) * 2011-04-29 2013-07-23 Corning Incorporated Distributed Brillouin sensing systems and methods using few-mode sensing optical fiber

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CN208723306U (en) * 2018-04-18 2019-04-09 华南理工大学 A kind of all -fiber high-order mode Brillouin optical fiber laser

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