CN108390243B - High-order mode Brillouin fiber laser based on few-mode fiber - Google Patents
High-order mode Brillouin fiber laser based on few-mode fiber Download PDFInfo
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- CN108390243B CN108390243B CN201810348338.4A CN201810348338A CN108390243B CN 108390243 B CN108390243 B CN 108390243B CN 201810348338 A CN201810348338 A CN 201810348338A CN 108390243 B CN108390243 B CN 108390243B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06762—Fibre amplifiers having a specific amplification band
- H01S3/06766—C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm
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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
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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
- H01S3/30—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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- 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 a high-order mode Brillouin optical fiber laser based on a few-mode optical fiber, which has an annular cavity structure and comprises a narrow linewidth pump laser, an optical amplifier, a first optical fiber mode selection coupler, a first polarization controller, an optical fiber circulator, a second optical fiber mode selection coupler, a second polarization controller and a few-mode optical fiber; the first optical fiber mode selection coupler is an extracavity mode conversion device, and 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; the second optical fiber mode selection coupler is an intra-cavity mode coupling device, can realize directional selection coupling of a high-order mode in the few-mode optical fiber and a high-order mode in the few-mode optical fiber, and can realize resonance amplification of the high-order mode in the cavity based on Brillouin nonlinear gain of the few-mode optical fiber in the annular cavity and directly output high-order mode laser.
Description
Technical Field
The invention relates to the technical fields of fiber lasers and optical communication, in particular to a high-order mode Brillouin fiber laser based on a few-mode fiber.
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 a high-order mode Brillouin optical fiber laser based on a few-mode optical fiber, which is based on the Brillouin nonlinear effect, takes a passive few-mode optical 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: a few-mode fiber based high-order mode brillouin fiber laser, comprising: the system comprises a narrow linewidth pump laser, an optical amplifier, a first optical fiber mode selection coupler, a first polarization controller, an optical fiber circulator, a second optical fiber mode selection coupler, a second polarization controller and a few-mode optical fiber;
the optical fiber circulator is a three-port optical fiber circulator provided with a first port, a second port and a third port; the narrow linewidth pump laser is connected to the optical amplifier; the optical amplifier is connected to a first port of a first optical fiber mode selection coupler, and a second port of the first optical fiber mode selection coupler is connected to a first port of an optical fiber circulator through a first polarization controller; the second port of the optical fiber circulator is connected with the first port of the second optical fiber mode selection coupler; the second port of the second optical fiber mode selection coupler is connected to the third port of the optical fiber circulator through the second polarization controller and the few-mode optical fiber to form an annular cavity; and the third port of the second optical fiber mode selection coupler outputs laser.
Preferably, the narrow linewidth pump laser is 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 is a high-gain erbium-doped optical fiber amplifier or a 1550 nm-band semiconductor optical amplifier.
Preferably, the first optical fiber mode selection coupler is a 2×2 coupler made by melting and tapering a single-mode optical fiber and a few-mode optical fiber, and can realize directional selection coupling between a fundamental transverse mode in the single-mode optical fiber and a specific higher-order mode in the few-mode optical fiber, wherein 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.
Preferably, the optical fiber circulator is a few-mode optical fiber circulator, and tail fibers of the three ports are few-mode optical fibers.
Preferably, the second optical fiber mode selection coupler is a 2×2 coupler made by melting and tapering a few-mode optical fiber and a few-mode optical fiber, which can realize directional selection coupling between a specific high-order mode in the few-mode optical fiber and a specific high-order mode in the few-mode optical fiber, and the tail fibers of the four ports are few-mode optical fibers.
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.
The optical fiber laser is of an annular cavity structure, the annular cavity comprises an optical fiber circulator and an optical fiber mode selection coupler, and the optical fiber connected in the whole annular cavity is a few-mode optical fiber. The invention utilizes stimulated Brillouin scattering in the few-mode optical fiber to realize resonance amplification of a high-order mode in the resonant cavity, and generates 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 laser resonant cavity external mode conversion device and the laser output coupling device, and has the advantages of low 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 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 structure, low cost, easy integration of fiber systems, good stability of output laser and narrow line width, and improves the practicability and reliability of the high-order mode laser.
Drawings
Fig. 1 is a schematic diagram of a high-order mode brillouin fiber laser based on a few-mode fiber according to an embodiment.
In the figure: 1-a narrow linewidth pump laser; a 2-optical amplifier; 3-a first fiber mode selection coupler; 4-a first polarization controller; a 5-fiber circulator; 6-a second fiber mode selection coupler; 7-a second polarization controller; 8-few-mode optical fiber.
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, a high-order-mode brillouin fiber laser based on a few-mode fiber of this example includes a narrow linewidth pump laser 1, an optical amplifier 2, a first fiber mode selection coupler 3, a first polarization controller 4, a fiber circulator 5, a second fiber mode selection coupler 6, a second polarization controller 7, and a few-mode fiber 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 301 of the first optical fiber mode selection coupler 3, after passing through the first optical fiber mode selection coupler 3, the pump light is converted from the fundamental transverse mode of the single mode optical fiber in the first port 301 to the specific high-order mode of the few-mode optical fiber in the second port 302 of the first optical fiber mode selection coupler 3, the generated high-order mode pump light is injected into the first port 501 of the optical fiber circulator 5, and then is injected into the first port 601 of the second optical fiber mode selection coupler 6 from the second port 502 of the optical fiber circulator 5, namely, enters the few-mode optical fiber 8.
When the pump light power amplified by the optical amplifier 2 exceeds the brillouin threshold of the few-mode optical fiber 8, 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 8 enters the few-mode optical fiber 8 again through the first port 601 of the second optical fiber mode selection coupler 6, the second port 502 of the optical fiber circulator 5 and the third port 503 of the optical fiber circulator 5 in sequence, and oscillates in the resonant cavity, that is, a first-order brillouin stokes laser with a frequency lower than that of the pumping light is generated, and the brillouin stokes laser is output through the third port 603 of the second optical fiber mode selection coupler 6. The first polarization controller 4 between the second port 302 of the first fiber mode selection coupler 3 and the first port 501 of the fiber circulator 5 and the second polarization controller 7 on the few-mode fiber 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 first port 301 and the fourth port 304 of the first fiber mode selection coupler 3 are all common communication single mode fibers. Since the connecting fibers in the annular cavity are all few-mode fibers and operate in a higher order mode, intracavity higher order mode resonant amplification is achieved, thereby obtaining high mode purity higher order mode laser light at the third port 603 of the second fiber mode selection coupler 6.
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 first optical fiber mode selection coupler is a 2 multiplied by 2 coupler manufactured by melting and tapering a single-mode optical fiber and a few-mode optical fiber, can realize directional selection coupling between a fundamental transverse mode in the single-mode optical fiber and a specific high-order mode in the few-mode optical fiber, and 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 fiber circulator is a few-mode fiber circulator, and tail fibers of the three ports are few-mode fibers.
The second optical fiber mode selection coupler is a 2 multiplied by 2 coupler manufactured by melting and tapering a few-mode optical fiber and a few-mode optical fiber, and can realize directional selection coupling between a specific high-order mode in the few-mode optical fiber and a specific high-order mode in the few-mode optical fiber, and tail fibers of four ports are few-mode optical fibers.
The few-mode optical fiber is a common commercial 1550 nm-band few-mode optical fiber, the number of supported modes is more than 2, and the length is more than 20m.
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. A high-order mode brillouin fiber laser based on a few-mode fiber, comprising: the system comprises a narrow linewidth pump laser, an optical amplifier, a first optical fiber mode selection coupler, a first polarization controller, an optical fiber circulator, a second optical fiber mode selection coupler, a second polarization controller and a few-mode optical fiber;
the optical fiber circulator is a three-port optical fiber circulator provided with a first port, a second port and a third port; the narrow linewidth pump laser is connected to the optical amplifier; the optical amplifier is connected to a first port of a first optical fiber mode selection coupler, and a second port of the first optical fiber mode selection coupler is connected to a first port of an optical fiber circulator through a first polarization controller; the second port of the optical fiber circulator is connected with the first port of the second optical fiber mode selection coupler; the second port of the second optical fiber mode selection coupler is connected to the third port of the optical fiber circulator through the second polarization controller and the few-mode optical fiber to form an annular cavity; outputting laser from a third port of the second optical fiber mode selection coupler;
the first optical fiber mode selection coupler is a 2 multiplied by 2 coupler manufactured by melting and tapering a single-mode optical fiber and a few-mode optical fiber, so that the directional selection coupling between a fundamental transverse mode in the single-mode optical fiber and a specific high-order mode in the few-mode optical fiber 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 second optical fiber mode selection coupler is a 2 multiplied by 2 coupler manufactured by melting and tapering a few-mode optical fiber and a few-mode optical fiber, and realizes directional selection coupling between a specific high-order mode in the few-mode optical fiber and a specific high-order mode in the few-mode optical fiber, and tail fibers of four ports are few-mode optical fibers.
2. The high-order mode brillouin optical fiber laser based on the few-mode optical fiber 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 power in the C-band, and the linewidth is lower than 1MHz.
3. The high-order mode brillouin optical fiber laser based on few-mode optical fiber according to claim 1, wherein said optical amplifier is a high-gain erbium-doped optical fiber amplifier or a 1550 nm-band semiconductor optical amplifier.
4. The high-order brillouin optical fiber laser based on the few-mode optical fiber according to claim 1, wherein the optical fiber circulator is a few-mode optical fiber circulator, and the tail fibers of the three ports are few-mode optical fibers.
5. The high-order mode brillouin optical fiber laser based on the few-mode optical fiber according to claim 1, wherein 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.
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| CN110308516A (en) * | 2019-07-30 | 2019-10-08 | 南京邮电大学 | A kind of mode conversion and application based on less fundamental mode optical fibre coupler |
| CN114721233B (en) * | 2022-06-09 | 2023-03-07 | 之江实验室 | Optical field generating device based on optical fiber device and single-wavelength super-resolution lithography system |
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| US7272160B1 (en) * | 2005-01-24 | 2007-09-18 | Np Photonics, Inc | Single-frequency Brillouin fiber ring laser with extremely narrow linewidth |
| CN103825190A (en) * | 2014-03-13 | 2014-05-28 | 哈尔滨工业大学 | Method and device for outputting high-energy fundamental mode laser in large-core-diameter optical fibre based on stimulated Brillouin scattering technology |
| CN107834351A (en) * | 2017-09-19 | 2018-03-23 | 南京邮电大学 | A kind of 1 mu m waveband post vector optical fiber laser based on model selection coupler |
| CN208862359U (en) * | 2018-04-18 | 2019-05-14 | 华南理工大学 | A kind of high-order mode Brillouin optical fiber laser based on less fundamental mode optical fibre |
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| US7949017B2 (en) * | 2008-03-10 | 2011-05-24 | Redwood Photonics | Method and apparatus for generating high power visible and near-visible laser light |
| 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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| US7272160B1 (en) * | 2005-01-24 | 2007-09-18 | Np Photonics, Inc | Single-frequency Brillouin fiber ring laser with extremely narrow linewidth |
| CN103825190A (en) * | 2014-03-13 | 2014-05-28 | 哈尔滨工业大学 | Method and device for outputting high-energy fundamental mode laser in large-core-diameter optical fibre based on stimulated Brillouin scattering technology |
| CN107834351A (en) * | 2017-09-19 | 2018-03-23 | 南京邮电大学 | A kind of 1 mu m waveband post vector optical fiber laser based on model selection coupler |
| CN208862359U (en) * | 2018-04-18 | 2019-05-14 | 华南理工大学 | A kind of high-order mode Brillouin optical fiber laser based on less fundamental mode optical fibre |
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