CN107026383B - Wavelength-tunable single-polarization single-frequency ring cavity fiber laser - Google Patents
Wavelength-tunable single-polarization single-frequency ring cavity fiber laser Download PDFInfo
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- CN107026383B CN107026383B CN201710479108.7A CN201710479108A CN107026383B CN 107026383 B CN107026383 B CN 107026383B CN 201710479108 A CN201710479108 A CN 201710479108A CN 107026383 B CN107026383 B CN 107026383B
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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
- H01S3/06712—Polarising fibre; Polariser
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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
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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Abstract
The invention discloses a wavelength-tunable single-polarization single-frequency ring cavity fiber laser, which belongs to the technical field of fiber lasers and structurally comprises a pumping source (1), a wavelength division multiplexer (2), an erbium-doped fiber (3), a fiber polarizer (4), a polarization maintaining fiber (5), a band-pass filter (6), an optical isolator (7), a 2 x 2 optical coupler (8), a two-mode graded index fiber (9), a fiber circulator (10) and a polarization controller (11). The invention adopts a compact and simple design structure to obtain high-quality laser output, has strong practicability, not only has single-frequency characteristic, but also has single-polarization characteristic, and is suitable for high-speed optical fiber communication systems and polarization-sensitive optical fiber systems.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a wavelength-tunable single-polarization single-frequency ring cavity fiber laser.
Background
The fiber laser has the characteristics of high yield, good heat dissipation, high coupling efficiency with an optical fiber system and the like, and has wide application value in the fields of optical fiber communication, photo-generated microwave, optical fiber sensing and the like, for example, the mode interference ring cavity fiber laser sensor disclosed in Chinese patent CN103852092A combines mode interference sensing and fiber laser resonance, and can be used for sensing and measuring various physical quantities such as displacement, temperature, strain and the like. At present, erbium-doped fiber lasers are mostly operated in a multi-longitudinal-mode state, which limits the application of the erbium-doped fiber lasers in high-speed fiber communication systems, and researchers propose to adopt a phase-shift fiber grating, an inverse Gaussian apodization fiber Bragg grating, an ultrashort cavity method, a saturable absorber method, a composite cavity method and the like to ensure that output laser has single-frequency characteristics. However, in the prior art, two orthogonal polarization modes exist in a single-frequency fiber laser, which limits the application of the single-frequency fiber laser in a polarization-sensitive fiber system, and for this reason, researchers propose to use a fiber polarizer, a polarization-maintaining fiber grating, and self-injection locking to ensure that the output laser has a single polarization characteristic. However, in the prior art, the fiber laser has the disadvantages of high requirements on the manufacturing process, complex structure, difficulty in realizing single frequency and single polarization characteristics, and the like.
Through the literature and the research and the search of patent, the patent report of the wavelength tunable single-polarization single-frequency ring cavity optical fiber laser with the same structure is not seen so far.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the problems of multi-longitudinal mode oscillation and non-single polarization state output of the optical fiber laser in the background technology and provides a wavelength tunable single-polarization single-frequency ring cavity optical fiber laser.
The technical scheme of the invention is as follows:
A wavelength tunable single polarization single frequency ring cavity fiber laser has the structure of a pump source 1, a wavelength division multiplexer 2, an erbium-doped fiber 3, a band-pass filter 6, an optical isolator 7, a 2 x 2 optical coupler 8 and a fiber circulator 10, and is characterized in that the structure also has a fiber polarizer 4, a polarization maintaining fiber 5, a two-mode graded index fiber 9 and a polarization controller 11; wherein said band-pass filter 6 is a tunable band-pass filter;
The output port of the pump source 1 is connected with the 980nm port of the wavelength division multiplexer 2, the 1550nm port of the wavelength division multiplexer 2 is connected with one end of the optical fiber polarizer 4, the other end of the optical fiber polarizer 4 is connected with one end of the polarization maintaining optical fiber 5, the other end of the polarization maintaining optical fiber 5 is connected with the input end of the band-pass filter 6, the output end of the band-pass filter 6 is connected with the input end of the optical isolator 7, the output end of the optical isolator 7 is connected with the 1 port of the 2 x 2 optical coupler 8, the 3 port of the 2 x 2 optical coupler 8 is connected with one end of the two-mode graded index optical fiber 9, the other end of the two-mode graded index optical fiber 9 is connected with the 2 port of the optical fiber circulator 10, the 3 port of the optical fiber circulator 10 is connected with one end of the polarization controller 11, the other end of the polarization controller 11 is connected with the 1 port of the optical fiber circulator 10, the other end of the erbium-doped fiber 3 is connected with a common port of the wavelength division multiplexer 2, and 4 ports of the 2 multiplied by 2 optical coupler 8 are used as output ports of the wavelength tunable single-polarization single-frequency ring cavity fiber laser.
In the wavelength tunable single-polarization single-frequency ring cavity fiber laser, the pump source 1 is preferably a 980nm pump source, the wavelength division multiplexer 2 is preferably an 980/1550nm wavelength division multiplexer, and the 2 × 2 optical coupler 8 is preferably a standard single-mode fiber coupler with a splitting ratio of 30: 70.
Has the advantages that:
1. The wavelength-tunable single-polarization single-frequency annular cavity optical fiber laser adopts a compact and simple design structure to obtain high-quality laser output, and has strong practicability;
2. the wavelength tunable single-polarization single-frequency ring cavity optical fiber laser not only has single-frequency characteristic, but also has single-polarization characteristic, and is suitable for high-speed optical fiber communication systems and polarization sensitive optical fiber systems.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a wavelength tunable single polarization single frequency ring cavity fiber laser of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings, and the following examples are illustrative only and are not to be construed as limiting the present patent.
EXAMPLE 1 detailed construction of the invention
Fig. 1 is a schematic structural diagram of a wavelength tunable single-polarization single-frequency ring cavity fiber laser according to the present invention. The device comprises a pumping source 1, a wavelength division multiplexer 2, an erbium-doped fiber 3, a fiber polarizer 4, a polarization maintaining fiber 5, a band-pass filter 6, an optical isolator 7, a 2 x 2 optical coupler 8, a two-mode graded index fiber 9, a fiber circulator 10 and a polarization controller 11.
The connection relationship is as follows: the output port of the pump source 1 is connected with the 980nm port of the wavelength division multiplexer 2, the 1550nm port of the wavelength division multiplexer 2 is connected with one end of the optical fiber polarizer 4, the other end of the optical fiber polarizer 4 is connected with one end of the polarization maintaining optical fiber 5, the other end of the polarization maintaining optical fiber 5 is connected with the input end of the band-pass filter 6, the output end of the band-pass filter 6 is connected with the input end of the optical isolator 7, the output end of the optical isolator 7 is connected with the 1 port of the 2 x 2 optical coupler 8, the 3 port of the 2 x 2 optical coupler 8 is connected with one end of the two-mode graded index optical fiber 9, the other end of the two-mode graded index optical fiber 9 is connected with the 2 port of the optical fiber circulator 10, the 3 port of the optical fiber circulator 10 is connected with one end of the polarization controller 11, the other end of the polarization controller 11 is connected with the 1 port of the optical fiber circulator 10, the other end of the erbium-doped fiber 3 is connected with the common port of the wavelength division multiplexer 2, and 4 ports of the 2 x 2 optical coupler 8 are used as output ports of the whole system. The connection among the above components adopts optical fiber fusion.
Referring to fig. 1, the pump source 1 is a 980nm pump source, the wavelength division multiplexer 2 is an 980/1550nm wavelength division multiplexer, and the pump source 1 provides a 980nm pump optical signal for the fiber laser through the wavelength division multiplexer 2; the erbium-doped fiber 3 is a high-gain erbium-doped fiber and is used as a gain medium of the fiber laser; the polarization maintaining fiber 5 is a polarization maintaining fiber with high birefringence, and forms a birefringent fiber filter together with the fiber polarizer 4; the band-pass filter 6 is a tunable band-pass filter and is used for selecting the position of a transmission peak of a comb-shaped transmission spectrum of the birefringent optical fiber filter as a lasing wavelength; the optical isolator 7 is used for ensuring that the laser signal in the resonant cavity runs clockwise in the attached figure 1; the 2 × 2 optical coupler 8 is a standard single-mode fiber coupler with a splitting ratio of 30:70, a port 1 of the 2 × 2 optical coupler 8 is connected with the output end of the optical isolator 7, a single-mode pigtail of a port 3 (splitting ratio of 30%) of the 2 × 2 optical coupler 8 is connected with one end of two mode graded-index fibers 9, a port 2 of the 2 × 2 optical coupler 8 is connected with one end of the erbium-doped fiber 3 to form an annular resonant cavity, and a port 4 (splitting ratio of 70%) of the 2 × 2 optical coupler 8 is used as a system output port; the two-mode graded index fiber 9 is a few-mode fiber with only LP01 and LP11, and forms a spatial mode interference filter together with a 3-port single-mode pigtail of the 2 × 2 optical coupler 8 and a 2-port single-mode pigtail of the fiber circulator 10; the optical fiber circulator 10 is a three-port optical fiber circulator, and the 1 port and the 3 ports of the optical fiber circulator and the polarization controller 11 form an optical fiber reflector, which is used for adjusting the polarization state of an optical signal in the ring-shaped resonant cavity and changing the coupling ratio among different modes.
example 2 working principle of the invention
The wavelength tunable single-polarization single-frequency ring cavity optical fiber laser adopts a reverse pumping structure, a 980nm pumping optical signal emitted by a pumping source 1 pumps a section of erbium-doped optical fiber 3 through a wavelength division multiplexer 2, an optical isolator 7 is used for ensuring that a laser signal in a ring resonant cavity runs clockwise, and a reverse spontaneous radiation optical amplification signal (generated by the erbium-doped optical fiber 3) enters a double-refraction optical fiber filter consisting of an optical fiber polarizer 4 and a polarization maintaining optical fiber 5. The birefringent fiber filter effectively selects a single-polarization optical signal, has good polarization maintaining characteristics beneficial to single-polarization output of the fiber laser, and has narrow-band filtering characteristics beneficial to inhibition of multi-longitudinal-mode oscillation of the fiber laser. The wavelength interval of the comb transmission spectrum of the birefringent optical fiber filter is more than or equal to the 3dB bandwidth of the band-pass filter 6, and the central wavelength of the band-pass filter 6 is sequentially tuned to the position of the transmission peak of the comb transmission spectrum of the birefringent optical fiber filter, so that the selection of the lasing wavelength of the optical fiber laser is realized. A spatial mode interference filter is composed of a 3-port single-mode pigtail of a 2 × 2 optical coupler 8, two-mode graded-index optical fibers 9 and a 2-port single-mode pigtail of an optical fiber circulator 10, an optical signal enters the spatial mode interference filter based on the two-mode graded-index optical fibers 9 through a 1-port of the 2 × 2 optical coupler 8, and only two modes LP01 and LP11 interfere with each other in the spatial mode interference filter based on the two-mode graded-index optical fibers 9. The optical fiber circulator 10 and the polarization controller 11 form an optical fiber mirror, and the polarization controller 11 can be adjusted to adjust the polarization state of the optical signal reentering the optical fiber polarizer 4 in the cyclic oscillation process and also to change the coupling ratio between the two modes in the cyclic oscillation process. The optical signal reflected by the optical fiber reflector passes through the spatial mode interference filter based on the two-mode graded index optical fiber 9 again, so that the interference between the two modes LP01 and LP11 is enhanced, a stray side mode caused by multimode interference can be filtered, and the effect of inhibiting the multi-longitudinal mode oscillation of the optical fiber laser is achieved. Optical signals are fed back to a 2 port of a 2 x 2 optical coupler 8 through a 3 port of the 2 x 2 optical coupler 8, the 2 port of the 2 x 2 optical coupler 8 is connected with one end of an erbium-doped fiber 3 to form an annular resonant cavity, the feedback optical signals circularly oscillate in the annular resonant cavity, multi-longitudinal-mode oscillation of the fiber laser is effectively inhibited under the combined action of a birefringent fiber filter and a spatial mode interference filter, and the polarization state of the laser signals is continuously optimized under the combined action of the birefringent fiber filter and a polarization controller, so that the laser output through a 4 port of the 2 x 2 optical coupler 8 has single-frequency and single-polarization characteristics.
Claims (1)
1. A wavelength tunable single-polarization single-frequency ring cavity fiber laser structurally comprises a pumping source (1), a wavelength division multiplexer (2), an erbium-doped fiber (3), a band-pass filter (6), an optical isolator (7), a 2 x 2 optical coupler (8) and a fiber circulator (10), and is characterized in that the fiber laser structurally comprises a fiber polarizer (4), a polarization maintaining fiber (5), a two-mode graded index fiber (9) and a polarization controller (11); wherein said band-pass filter (6) is a tunable band-pass filter;
The output port of the pump source (1) is connected with the 980nm port of the wavelength division multiplexer (2), the 1550nm port of the wavelength division multiplexer (2) is connected with one end of the optical fiber polarizer (4), the other end of the optical fiber polarizer (4) is connected with one end of the polarization maintaining optical fiber (5), the other end of the polarization maintaining optical fiber (5) is connected with the input end of the band-pass filter (6), the output end of the band-pass filter (6) is connected with the input end of the optical isolator (7), the output end of the optical isolator (7) is connected with the 1 port of the 2 x 2 optical coupler (8), the 3 port of the 2 x 2 optical coupler (8) is connected with one end of the two mode graded index optical fibers (9), the other end of the two mode graded index optical fibers (9) is connected with the 2 port of the optical fiber circulator (10), the 3 port of the optical fiber circulator (10) is connected with one end of the polarization controller (11, the other end of the polarization controller (11) is connected with a port 1 of the optical fiber circulator (10), a port 2 of the 2 x 2 optical coupler (8) is connected with one end of the erbium-doped optical fiber (3), the other end of the erbium-doped optical fiber (3) is connected with a common port of the wavelength division multiplexer (2), and a port 4 of the 2 x 2 optical coupler (8) is used as an output port of the wavelength tunable single-polarization single-frequency ring cavity optical fiber laser; the pump source (1) is a 980nm pump source, the wavelength division multiplexer (2) is an 980/1550nm wavelength division multiplexer, and the 2 x 2 optical coupler (8) is a standard single-mode optical fiber coupler with a splitting ratio of 30: 70.
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| CN201710479108.7A CN107026383B (en) | 2017-06-22 | 2017-06-22 | Wavelength-tunable single-polarization single-frequency ring cavity fiber laser |
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| CN108493749B (en) * | 2018-04-24 | 2023-09-08 | 南京邮电大学 | Tunable multi-wavelength fiber laser based on high-birefringence micro-nano fiber |
| CN114498262B (en) * | 2021-12-31 | 2023-11-07 | 北京交通大学 | Multi-wavelength switchable single-longitudinal-mode thulium-doped fiber laser |
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| CN100444480C (en) * | 2007-02-05 | 2008-12-17 | 北京交通大学 | Ring tunable single-frequency single-polarization fiber laser |
| CN100446358C (en) * | 2007-02-05 | 2008-12-24 | 北京交通大学 | Linear tunable single-frequency single-polarization fiber laser |
| CN101132102A (en) * | 2007-08-23 | 2008-02-27 | 上海交通大学 | Single-longitudinal mode optical fiber ring laser based on wave filter with double Sagnac rings |
| US20090225794A1 (en) * | 2008-03-10 | 2009-09-10 | Jian Liu | High Energy All Fiber Mode Locked Fiber Laser |
| CN100588056C (en) * | 2008-08-05 | 2010-02-03 | 北京航空航天大学 | Single-frequency single-polarization liner cavity ytterbium-doping optical fiver laser |
| CN101667710B (en) * | 2009-10-09 | 2011-01-05 | 北京航空航天大学 | Tunable single-frequency single polarization fiber laser based on polarization-preserved fiber grating |
| CN102946041B (en) * | 2012-11-26 | 2014-05-21 | 中国人民解放军国防科学技术大学 | Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth |
| CN104932121A (en) * | 2015-06-25 | 2015-09-23 | 天津理工大学 | Microwave photon filter based on multi-wavelength fiber laser and chirp Bragg gratings |
| CN106848823B (en) * | 2017-03-06 | 2023-09-05 | 南京邮电大学 | 8-shaped cavity mode locking column vector fiber laser based on mode selection coupler |
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