CN104617472B - Multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser - Google Patents
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- CN104617472B CN104617472B CN201510053287.9A CN201510053287A CN104617472B CN 104617472 B CN104617472 B CN 104617472B CN 201510053287 A CN201510053287 A CN 201510053287A CN 104617472 B CN104617472 B CN 104617472B
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Abstract
The invention discloses a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, belong to Fiber laser technology field, the laser is made up of Brillouin's pump laser source, the coupler of N × 1, circulator, wavelength division multiplexer, Er-doped fiber, Er-doped fiber pump light source, optical filter and the fiber coupler exported with N number of different wave length, N >=2.The present invention realizes the multi-wavelength Brillouin erbium-doped fiber laser of line width ultra-narrow simple in construction, is reduced for the cost of extensive wavelength-division multiplex system and performance boost plays an important roll.
Description
Technical field
The present invention relates to a kind of optical fiber laser, more particularly to a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser
Device (BEFL).
Background technology
Multi-wavelength super-narrow line width optical fiber laser, it is widely used in wavelength-division multiplex interference-type optical fiber sensor-based system, it is super
Narrow linewidth characteristic is an important development direction of current optical fiber laser, for reducing system noise, improves system detectio spirit
Sensitivity has vital effect.Current multi-wavelength optical fiber laser is mainly erbium doped fiber laser and nonlinear optical fiber
Laser.
Comb filter or interferometer filter are inserted in erbium doped fiber laser can obtain the output of multi-wavelength.But
It is that the fine uniform deployment characteristics of erbium limit it and are difficult to stablize multi-wavelength output.The side such as Er-doped fiber is cooled down by liquid nitrogen
Method solves, and this adds increased the complexity of laser.Brillouin optical fiber laser is by cascading stimulated Brillouin scattering (SBS)
Can export has the multiwavelength laser for waiting frequency interval.A kind of patent " the random optical-fiber laser of multi-wavelength based on hybrid gain
The device " (patent No.：ZL201320749678.0) disclose that a kind of output wavelength is more, wavelength interval about 10GHz multi-wavelength BEFL,
Patent application " multi-wavelength optical fiber laser of double Brillouin frequency shift interval " (publication number：CN 103337773A, publication date：
2013.10.02 a kind of output wavelength interval about 20GHz multi-wavelength Brillouin laser) is reported.But wavelength interval
When 10GHz and 20GHz multiwavelength laser is as Wavelength division multiplexed light source, Demodulation Systems complexity increase, interchannel is easily gone here and there
Disturb, actual application value reduces.And the laser needs long single-mode fiber to be easy to mode hopping, phase as gain media, output
Noise and line width deteriorate.
In recent years realize that the stable of Brillouin erbium-doped fiber laser exports to suppress mode hopping, a kind of patent " single-frequency ultra-narrow
Line width the Brillouin erbium-doped fiber laser " (patent No.：) and patent " tunable single polarization super-narrow line width ZL201110286976.6
The Brillouin erbium-doped fiber laser " (patent No.：ZL201210487520.0) two kinds of single-frequency, Ultrashort cavity BEFL are provided：A kind of base
In Brillouin's pumping phase-shifting technique, another kind is based on Er-doped fiber while is used as linear gain and brillouin gain medium, and two
Person overcomes the contradiction of short gain media and enough brillouin gains, realizes ultrashort cavity configuration, ensures to only exist in gain spectral
One pattern, so as to ensure that super-narrow line width exports.But have not yet to see the multi-wavelength super-narrow line width based on ultrashort cavity configuration
BEFL report.
The content of the invention
Current multi-wavelength BEFL uses passive fiber as brillouin gain medium more, by brillouin gain medium
Cascade SBS effects realize that multiwavelength laser exports, be the shortcomings that such multi-wavelength BEFL not compact structure, easy mode hopping, with
It is of the invention to use one and output frequency is spaced in 10GHz to the use between 20GHz, being unfavorable for existing wavelength-division multiplex system
Section Er-doped fiber proposes a kind of multi-wavelength ultra-narrow line on the basis of providing brillouin gain and the Ultrashort cavity BEFL of linear gain simultaneously
Wide Brillouin erbium-doped fiber laser.
The technical solution adopted by the present invention is：
A kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, it is characterised in that the laser is by with N number of
Brillouin's pump laser source of different wave length output, the coupler of N × 1, circulator, wavelength division multiplexer, Er-doped fiber, Er-doped fiber
Pump light source, optical filter and fiber coupler composition, N >=2；N number of different wave length of Brillouin's pump laser source swashs
Light output by N roots optical fiber through N × 1 coupler be connected to the first port of circulator, the second port of the circulator passes through
Optical fiber is connected to the reflector port of wavelength division multiplexer, and the Er-doped fiber pump light source is connected to wavelength division multiplexer by optical fiber
Passband port, the second port of fiber coupler is then connected to after the public port connection Er-doped fiber of the wavelength division multiplexer,
3rd port of the circulator is connected to the first port of fiber coupler by optical filter, and the of the fiber coupler
Three ports are used to export laser；The optical filter is the GFF that bandwidth covers N number of Brillouin's pump wavelength,
And ensure N number of Brillouin's Stokes (Stokes) light in the passband of wave filter；Brillouin's pump laser source output
The wavelength interval of N number of laser be not less than 50GHz.
Preferably, the optical filter use with N number of passband comb filter substitute, the comb filter it is each
Passband corresponds to Brillouin's Stokes optical wavelength, and each passband width is respectively less than 0.5nm.
Preferably, Brillouin's pump laser source is separate unit Brillouin's pumping laser with N number of different output wavelengths
Device, or N platforms have Brillouin's pump laser of different output wavelengths.
Preferably, the pump mode of described Er-doped fiber is single forward pumping, single backward pump or double
To pumping.
Preferably, described Er-doped fiber pump light source is that 980nm semiconductor laser or 1480nm semiconductor swash
Light device.
Preferably, described Er-doped fiber erbium-ytterbium co-doped fiber or the bismuth co-doped optical fiber of erbium substitute.
The Er-doped fiber in the present invention, its characteristic parameter, such as refractive index, length, doping concentration can be according to applications
It is actual selected, such as refractive index is 1.45, length 4m, doping concentration is 1.45 × 1025/m3。
The coupled modes that the fiber coupler in the present invention is 1 × 2 or 2 × 2, its splitting ratio should be according to practical application
It is determined that such as 1 × 2 coupled modes, splitting ratio 1:1.
The method have the benefit that：
1. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser provided by the invention, due to N number of different wave length (frequency
Interval be not less than 50GHz) one section of Er-doped fiber of optical pumping and excite stimulated Brillouin scattering, each Brillouin's pump light is distinguished
A brillouin gain is produced at its Brillouin shift, Brillouin's stoke is produced respectively in each brillouin gain spectrum
This light, adjacent Brillouin's stokes light wavelength interval are not less than 50GHz, and each stokes light is increased using independent Brillouin
Benefit, it is achieved that the super 50GHz of frequency interval, the multi-wavelength BEFL used suitable for wavelength-division multiplex system.
2. because one section of Er-doped fiber as hybrid gain medium while provides brillouin gain and linear gain so that this
The compact-sized of the Brillouin erbium-doped fiber laser of offer is provided, can realize that short cavity is grown, so as to ensure each Brillouin's pump
A pattern is only existed corresponding to Pu in brillouin gain spectrum, realizes the multi-wavelength BEFL of frequency stabilization.
3. because multi wavelength pumping light source can be provided with multiple semiconductor lasers, semiconductor laser is easily obtained,
It is cheap, although line width it is wider (>MHz), but because Brillouin erbium-doped fiber laser has strong linewidth compression effect,
Broadband pump laser is converted into the line width after Brillouin's Stokes light can be narrow to be less than 1kHz, so as to realize super-narrow line width BEFL.
In a word, the present invention can realization lasing light emitter (Brillouin's pump light) the acquisition multi-wavelength that line width is wider or noise is higher
The effect of super-narrow line width high quality laser (Brillouin's Stokes laser), this is for extensive wavelength division multiplexing communications or sensing
The cost of system reduces to be of great significance with performance boost tool.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Wherein：1 is Brillouin's pump laser source with the output of N number of different wave length laser, and 2 be the coupler of N × 1, and 3 be ring
Row device, 4 be wavelength division multiplexer, and 5 be Er-doped fiber pump light source, and 6 be Er-doped fiber, and 7 be optical filter, and 8 be fiber coupler,
11 to 1N be the 1st to export to n-th Brillouin pumping laser, 21 to 2N be the coupler of N × 1 first to N-port, 31 be ring
Row device first port, 32 be circulator second port, and 33 be the port of circulator the 3rd, and 41 be the reflector port of wavelength division multiplexer,
42 be the passband port of wavelength division multiplexer, and 43 be the public port of wavelength division multiplexer, and 81 be fiber coupler first port, and 82 are
Fiber coupler second port, 83 be the port of fiber coupler the 3rd.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings, it will be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, and it has N number of difference by one
The coupler 2 of 1, N of pump laser × 1 of wavelength laser output, a wavelength division multiplexer 4, one of circulator 3, one are mixed
5, one sections of the erbium pumped fiber light source optical filter 7 of Er-doped fiber 6, one and a fiber coupler 8 form, the fiber coupling
The coupled modes of device 8 are 1 × 2, and the coupler 2 of the N × 1 has N number of input port and an output port, its N number of input
Mouthful be respectively port 21, port 22 ..., port 2N, N number of laser output 11 of the pump laser 1,12 ..., 1N point
Not by N root optical fiber be connected to the port 21 of the coupler 2 of the N × 1, port 22 ..., port 2N, the circulator 3 is three
Port circulator, respectively first port 31, the port 33 of second port 32 and the 3rd, the output port connection of the coupler 2 of N × 1
The first port 31 of the circulator 3, the second port 32 of the circulator 3 connect the reflection of wavelength division multiplexer 4 by optical fiber
Port 41, the public port 43 of the wavelength division multiplexer 4 are connected behind one end of Er-doped fiber 6 again by the another of the Er-doped fiber 6
One end is connected to the second port 82 of fiber coupler 8；3rd port 33 of the circulator 3 is connected to by optical filter 7
The first port 81 of the fiber coupler 8, the 3rd port 83 of the fiber coupler 8 is used to export laser, wherein going in ring
The second port 32 of device 3, the 3rd port 33, reflector port 41, the public port 43 of wavelength division multiplexer 4, Er-doped fiber 6, optical fiber
The loop that second port 82, first port 81 and the optical filter 7 of coupler 8 form constitutes the humorous of laser of the present invention
Shake chamber, and the passband port 42 of the wavelength division multiplexer 4 connects Er-doped fiber pump light source 5 by optical fiber.
The operation principle of the present invention is as follows：N number of different wave length pumping laser of pump laser 1 exports through N × 1 coupler
The first port 31 of circulator 3 is injected after 2-in-1 beam, then through second port 32, ripple is entered by the reflector port 41 of wavelength division multiplexer 4
The public port 43 of division multiplexer 4 injects Er-doped fiber 6, and brillouin effect is excited in Er-doped fiber 6 and provides Brillouin's increasing
Benefit, produces the scattering light of transmission clockwise, and the scattering envelope of the clockwise direction transmission contains and N number of Brillouin's pump light
With frequency Rayleigh scatter light, and occur shift frequency Brillouin scattering in frequency upper shift N number of anti-Stokes light and
N number of stokes light that frequency moves down, the frequency of each stokes light/anti-Stokes light are compared under its Brillouin's pump light
A Brillouin shift is moved/moves up, the size of the Brillouin shift is about 11GHz.The er-doped that Er-doped fiber pump light source 5 exports
Pumped fiber light is entered after wavelength division multiplexer 4 again by the public port of wavelength division multiplexer 4 by the passband port 42 of wavelength division multiplexer 4
43 output injection Er-doped fibers 6, for providing linear gain to the light transmitted in Er-doped fiber 6.The scattering light of clockwise transmission
Inputted after Er-doped fiber 6 from the public port 43 of wavelength division multiplexer 4, from the output of its passband port 42 into the of circulator 3
Two-port netwerk 32, then enter optical filter 7 from the output of the 3rd port 33 of circulator 3, the optical filter 7 is used to filter out wave filter
Spontaneous emission noise outside bandwidth, then respectively enter the of the fiber coupler 8 from the first port 81 of fiber coupler 8
The port 83 of Two-port netwerk 82 and the 3rd, wherein the light into the second port 82 of fiber coupler 8 is again introduced into laser of the present invention
Right-hand circular in the resonator of device：The Linear Amplifer and Brillouin amplification of N number of stokes light experience Er-doped fiber 6, two
Laser generation is formed under kind amplification, is finally exported from the 3rd port 83 of fiber coupler 8；N number of Rayleigh scatters light
The Linear Amplifer resonant cavity loss of Er-doped fiber 6 is undergone, gain is suitable with loss, and final result is Rayleigh scattering light bases
This holding is constant；Resonant cavity loss is lost in N number of anti-Stokes light experience Brillouin, although also undergoing the line of Er-doped fiber 6
Property amplification, but gain be less than loss, be finally totally constrained.N number of Brillouin's pump light part remaining after Er-doped fiber 6
Enter fiber coupler 8 from the second port 82 of fiber coupler 8, then exported from the first port 81 of fiber coupler 8, quilt
3rd port 33 of circulator obstructs.
The optical filter 7 is the GFF that bandwidth covers N number of Brillouin's pump wavelength, and is ensured N number of
Brillouin's stokes light is in the passband of wave filter；The optical filter 7 is the comb filter with N number of passband, often
Individual passband corresponds to Brillouin's Stokes optical wavelength, and each passband width is respectively less than 0.5nm.The optical filter 7 is
The Primary Component of the present invention, ensures laser works of the present invention in brillouin gain and the coefficient more ripples of linear gain
Long super-narrow line width BEFL patterns, concrete reason are as follows：The brillouin gain of laser of the present invention and linear gain are by institute
State Er-doped fiber 6 to provide, wherein the brillouin gain of the Er-doped fiber 6 has the small spy of narrow bandwidth (about 20MHz), amplitude
Point；And its linear gain have with roomy (about 40nm), amplitude is big the characteristics of；But the linear gain of the Er-doped fiber 6 exists
Not uniformity, and there is gain peak at 1530nm in 40nm bandwidth range；If in laser of the present invention
Without optical filter 7, then the Er-doped fiber 6 provides at N number of Stokes optical wavelength linear gain and brillouin gain it
With the linear gain that will be provided still less than the Er-doped fiber 6 at 1530nm wavelength, according to Principles of Laser, laser will be
The 1530nm lower starting of oscillation of linear gain effect, the Erbium doped fiber laser pattern of only linear gain effect is worked in, rather than it is expected
Brillouin gain and the coefficient multi-wavelength super-narrow line width BEFL patterns of linear gain；It is humorous when laser of the present invention
Intracavitary of shaking introduces optical filter 7, and the optical filter 7 ensures the linear gain of the Er-doped fiber 6 in the optical filter 7
Uniformity in free transmission range, and the light outside the bandwidth of optical filter 7 is filtered out；N number of stokes light is located at
In the passband of optical filter 7, amplified jointly by the linear gain of the Er-doped fiber 6 and brillouin gain；The light filtering
Non- stokes light in the passband of device 7 is only amplified by the linear gain of the Er-doped fiber 6；Outside the passband of optical filter 7
Light is all filtered out；According to Principles of Laser, only N number of stokes light meets condition of resonance, can form laser generation.Therefore say
The optical filter 7 is the Primary Component of laser of the present invention.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, every utilization
The equivalent structure transformation that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.This invention is intended to cover the spirit and model of appended claims
Enclose interior various modifications.
Claims (6)
- A kind of 1. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, it is characterised in that：The laser by with it is N number of not Brillouin's pump laser source (1) of co-wavelength output, the coupler (2) of N × 1, circulator (3), wavelength division multiplexer (4), er-doped light Fine pump light source (5), Er-doped fiber (6), optical filter (7) and fiber coupler (8) composition, N >=2；Brillouin's pumping The laser output of N number of different wave length of lasing light emitter (1) by N roots optical fiber through N × 1 coupler (2) be connected to the of circulator (3) Single port (31), the second port (32) of the circulator (3) are connected to the reflector port of wavelength division multiplexer (4) by optical fiber, The Er-doped fiber pump light source (5) is connected to the passband port of wavelength division multiplexer (4), the wavelength division multiplexer by optical fiber (4) second port (82) of fiber coupler (8), the circulator are then connected to after public port connection Er-doped fiber (6) (3) the 3rd port (33) is connected to the first port (81) of fiber coupler (8), the optical fiber coupling by optical filter (7) 3rd port (83) of clutch (8) is used to export laser；The optical filter (7) is that bandwidth covers N number of Brillouin's pumping light wave Long GFF, and ensure N number of Brillouin's stokes light in the passband of wave filter；Brillouin's pumping The wavelength interval of N number of laser of lasing light emitter (1) output is not less than 50GHz.
- A kind of 2. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterised in that：The light Wave filter (7) is substituted with the comb filter with N number of passband, and each passband of the comb filter is corresponded in a cloth Deep Stokes optical wavelength, the width of each passband are respectively less than 0.5nm.
- A kind of 3. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterised in that：The cloth In deep pump laser source (1) be separate unit Brillouin's pump laser with N number of different output wavelengths, or N platforms have not With Brillouin's pump laser of output wavelength.
- A kind of 4. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterised in that：It is described to mix The pump mode of erbium optical fiber (6) is single forward pumping, single backward pump or two directional pump.
- A kind of 5. multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterised in that：It is described to mix Erbium pumped fiber light source (5) is 980nm semiconductor laser or 1480nm semiconductor laser.
- 6. a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, its feature as described in claim 1 to 5 any bar exists In：The Er-doped fiber (6) is substituted with erbium-ytterbium co-doped fiber or the bismuth co-doped optical fiber of erbium.
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| CN106410599B (en) * | 2016-10-31 | 2023-05-23 | 华南理工大学 | Brillouin single longitudinal mode frequency shift optical fiber laser |
| US10522968B2 (en) * | 2017-12-22 | 2019-12-31 | Futurewei Technologies, Inc. | Narrow linewidth multi-wavelength light sources |
| CN109029515A (en) * | 2018-07-24 | 2018-12-18 | 太原理工大学 | High-precision distributed optical fiber sensing system based on narrow linewidth high-order Brillouin's stokes wave |
| CN109698460B (en) * | 2019-02-28 | 2020-12-04 | 南京邮电大学 | Semi-open cavity multi-wavelength Brillouin-erbium-doped optical fiber random laser |
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| US8824513B2 (en) * | 2011-06-14 | 2014-09-02 | Bae Systems Information And Electronic Systems Integration Inc. | Method for beam combination by seeding stimulated brillouin scattering in optical fiber |
| 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 |
| CN103682977B (en) * | 2012-12-21 | 2016-04-06 | 聊城大学 | A kind of tunable Brillouin laser production method based on Dispersion Flattened Fiber and device |
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