CN104617472A - Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth - Google Patents
Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth Download PDFInfo
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Abstract
The invention discloses a Brillouin multi-wavelength erbium-doped fiber laser with ultra-narrow linewidth and belongs to the technical field of a fiber laser. The laser is composed of N Brillouin pumped laser sources with different-wavelength outputs, N*1 couplers, circulators, wavelength division multiplexers, erbium-doped fibers, erbium-doped fiber pump light sources, optical filters and optical fiber couplers, wherein N is no less than two. The Brillouin multi-wavelength erbium-doped fiber laser has the simple structure and ultra-narrow linewidth, thus the laser plays an important role in cost reduction and performance improvement of a large-scale wavelength division multiplexing system.
Description
Technical field
The present invention relates to a kind of fiber laser, particularly relate to a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser (BEFL).
Background technology
Multi-wavelength super-narrow line width fiber laser, be widely used in wavelength division multiplexing interference-type optical fiber sensor-based system, its super-narrow line width characteristic is an important development direction of current fiber laser, for reduction system noise, improves systems axiol-ogy sensitivity and has vital effect.Current multi-wavelength optical fiber laser is mainly erbium doped fiber laser and nonlinear optical fibre laser.
The output that comb filter or interferometer filter can obtain multi-wavelength is inserted in erbium doped fiber laser.But the even deployment characteristics of erbium fibre limits it and is difficult to realize the output of stable multi-wavelength.Solved by methods such as cooled with liquid nitrogen Er-doped fibers, this adds increased the complexity of laser.Brillouin optical fiber laser can export the multiwavelength laser with equifrequent interval by cascade stimulated Brillouin scattering (SBS).Patent " a kind of multi-wavelength random fiber laser based on hybrid gain " (patent No.: ZL201320749678.0) discloses the multi-wavelength BEFL that a kind of output wavelength is many, wavelength interval is about 10GHz, patent application " multi-wavelength optical fiber laser of double Brillouin frequency shift interval " (publication number: CN 103337773A, publication date: 2013.10.02) reports the multi-wavelength Brillouin laser that a kind of output wavelength interval is about 20GHz.But when the multiwavelength laser of wavelength interval 10GHz and 20GHz is as Wavelength division multiplexed light source, Demodulation Systems complexity increases, and interchannel easily crosstalk occurs, and actual application value reduces.And this laser needs long monomode fiber as gain media, export and be easy to mode hopping, phase noise and live width worsen.
In recent years the stable output in order to suppress mode hopping to realize Brillouin erbium-doped fiber laser, patent " a kind of single-frequency super-narrow line width Brillouin erbium-doped fiber laser " (patent No.: ZL201110286976.6) and patent " tunable single polarization super-narrow line width Brillouin erbium-doped fiber laser " (patent No.: ZL201210487520.0) provides two kinds of single-frequency, Ultrashort cavity BEFL: a kind of based on Brillouin's pumping phase-shifting technique, another kind of based on Er-doped fiber simultaneously as linear gain and brillouin gain medium, both all overcome the contradiction of short gain media and enough brillouin gains, realize Ultrashort cavity structure, ensure only there is a pattern in gain spectral, thus ensure that super-narrow line width exports.But have not yet to see the report of the multi-wavelength super-narrow line width BEFL based on Ultrashort cavity structure.
Summary of the invention
Current multi-wavelength BEFL many employings passive fiber is as brillouin gain medium, realize multiwavelength laser by the cascade SBS effect on brillouin gain medium to export, the shortcoming of this type of multi-wavelength BEFL is interposed between 10GHz to 20GHz between not compact, the easy mode hopping of structure and output frequency, be unfavorable for the use of existing wavelength-division multiplex system, the present invention provides on the Ultrashort cavity BEFL basis of brillouin gain and linear gain at use one section of Er-doped fiber simultaneously and proposes a kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser.
The technical solution used in the present invention is:
A kind of multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, it is characterized in that, described laser by having Brillouin's pump laser source that N number of different wave length exports, N × 1 coupler, circulator, wavelength division multiplexer, Er-doped fiber, Er-doped fiber pump light source, optical filter and fiber coupler form, N >=2, the Laser output of N number of different wave length of described Brillouin's pump laser source is connected to the first port of circulator through N × 1 coupler by N root optical fiber, second port of described circulator by Fiber connection to the reflector port of wavelength division multiplexer, described Er-doped fiber pump light source by Fiber connection to the passband port of wavelength division multiplexer, the second port of fiber coupler is connected to again after the public port connection Er-doped fiber of described wavelength division multiplexer, 3rd port of described circulator is connected to the first port of fiber coupler by optical filter, 3rd port of described fiber coupler is used for Output of laser, described optical filter is the gain flattening filter that bandwidth covers N number of Brillouin's pump wavelength, and ensures that N number of Brillouin's Stokes (Stokes) light is all in the passband of filter, the wavelength interval of N number of laser that described Brillouin's pump laser source exports is not less than 50GHz.
Preferably, the described optical filter comb filter with N number of passband substitutes, and all corresponding Brillouin's Stokes optical wavelength of each passband of described comb filter, each passband width is all less than 0.5nm.
Preferably, described Brillouin's pump laser source is the separate unit Brillouin pump laser with N number of different output wavelength, or N platform has Brillouin's pump laser of different output wavelength.
Preferably, the pump mode of described Er-doped fiber is single forward pumping, single backward pump or two directional pump.
Preferably, described Er-doped fiber pump light source is the semiconductor laser of 980nm or the semiconductor laser of 1480nm.
Preferably, described Er-doped fiber erbium-ytterbium co-doped fiber or the bismuth co-doped optical fiber of erbium substitute.
Described Er-doped fiber in the present invention, its characteristic parameter, as refractive index, length, doping content etc., can be actual selected according to application, such as refractive index is 1.45, and length is 4m, and doping content is 1.45 × 10
25/ m
3.
Described fiber coupler in the present invention is the coupled modes of 1 × 2 or 2 × 2, and its splitting ratio should be determined according to practical application, such as 1 × 2 coupled modes, splitting ratio 1:1.
Advantageous Effects of the present invention is:
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 is not less than 50GHz) optical pumping one section of Er-doped fiber and excite stimulated Brillouin scattering, each Brillouin's pump light produces a brillouin gain at its Brillouin shift place respectively, Brillouin's stokes light is produced respectively in each brillouin gain spectrum, adjacent Brillouin's stokes light wavelength interval is not less than 50GHz, each stokes light utilizes independently brillouin gain, therefore achieve frequency interval and surpass 50GHz, be suitable for the multi-wavelength BEFL that wavelength-division multiplex system uses.
2. because one section of Er-doped fiber provides brillouin gain and linear gain as hybrid gain medium simultaneously, make the compact conformation of Brillouin erbium-doped fiber laser provided by the invention, short cavity can be realized long, thus ensure only there is a pattern in the brillouin gain spectrum that each Brillouin's pumping is corresponding, achieve the multi-wavelength BEFL of frequency stabilization.
3. because multi wavelength pumping light source can provide with multiple semiconductor laser, semiconductor laser is easy to obtain, cheap, although live width wider (>MHz), but because Brillouin erbium-doped fiber laser has strong linewidth compression effect, Broadband pump laser converts the live width after Brillouin Stokes light to can be narrow to being less than 1kHz, thus realize super-narrow line width BEFL.
In a word, the present invention can realize the effect that wider by live width or that noise is higher lasing light emitter (Brillouin's pump light) obtains multi-wavelength super-narrow line width high-quality laser (Brillouin's Stokes laser), and this cost reduction for extensive wavelength division multiplexing communications or sensor-based system is of great significance with performance boost tool.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein: 1 for having Brillouin's pump laser source of N number of different wave length Laser output, 2 is N × 1 coupler, 3 is circulator, 4 is wavelength division multiplexer, 5 is Er-doped fiber pump light source, 6 is Er-doped fiber, 7 is optical filter, 8 is fiber coupler, 11 to 1N is that the 1st to the N number of Brillouin's pumping laser exports, 21 to 2N is first of N × 1 coupler to N port, 31 is circulator first port, 32 is circulator second port, 33 is circulator the 3rd port, 41 is the reflector port of wavelength division multiplexer, 42 is the passband port of wavelength division multiplexer, 43 is the public port of wavelength division multiplexer, 81 is fiber coupler first port, 82 is fiber coupler second port, 83 is fiber coupler the 3rd port.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further, should be appreciated that specific embodiment described herein only in order to explain the present invention, be 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 the pump laser 1 of N number of different wave length Laser output by one, N × 1 coupler 2, circulator 3, a wavelength division multiplexer 4, an Er-doped fiber pump light source 5, one section of Er-doped fiber 6, an optical filter 7 and a fiber coupler 8 form, and the coupled modes of described fiber coupler 8 are 1 × 2, and described N × 1 coupler 2 has N number of input port and an output port, and its N number of input port is respectively port 21, port 22, port 2N, N number of Laser output 11 of described pump laser 1, 12, 1N respectively by N root Fiber connection to the port 21 of described N × 1 coupler 2, port 22, port 2N, described circulator 3 is three-port circulator, is respectively the first port 31, second port 32 and the 3rd port 33, the output port of N × 1 coupler 2 connects the first port 31 of described circulator 3, the other end of described Er-doped fiber 6, by the reflector port 41 of Fiber connection wavelength division multiplexer 4, is connected to the second port 82 of fiber coupler 8 by the second port 32 of described circulator 3 again after the public port 43 of described wavelength division multiplexer 4 connects one end of Er-doped fiber 6, 3rd port 33 of described circulator 3 is connected to the first port 81 of described fiber coupler 8 by optical filter 7,3rd port 83 of described fiber coupler 8 is for Output of laser, wherein the second port 32, the 3rd port 33 of circulator 3, the reflector port 41 of wavelength division multiplexer 4, public port 43, Er-doped fiber 6, the loop that second port 82, first port 81 of fiber coupler 8 and optical filter 7 form constitutes the resonant cavity of laser of the present invention, and the passband port 42 of described wavelength division multiplexer 4 is by Fiber connection Er-doped fiber pump light source 5.
Operation principle of the present invention is as follows: N number of different wave length pumping laser of pump laser 1 exports the first port 31 injecting circulator 3 after the 2-in-1 bundle of N × 1 coupler, again through the second port 32, the public port 43 being entered wavelength division multiplexer 4 by the reflector port 41 of wavelength division multiplexer 4 injects Er-doped fiber 6, in Er-doped fiber 6, excite brillouin effect and brillouin gain is provided, produce the scattered light of clockwise direction transmission, the scattering envelope of described clockwise direction transmission is containing Rayleigh scattered light frequently same with N number of Brillouin's pump light, and N number of stokes light that on the Brillouin scattering medium frequency that shift frequency occurs, N number of anti-Stokes light of moving and frequency move down, the frequency of each stokes light/anti-Stokes light is compared its Brillouin's pump light and is moved down/above move a Brillouin shift, the size of this Brillouin shift is about 11GHz.The Er-doped fiber pump light that Er-doped fiber pump light source 5 exports enters again by the public port 43 output injection Er-doped fiber 6 of wavelength division multiplexer 4 after wavelength division multiplexer 4 by the passband port 42 of wavelength division multiplexer 4, provides linear gain for giving the light of transmission in Er-doped fiber 6.The public port 43 of scattered light from wavelength division multiplexer 4 after Er-doped fiber 6 of clockwise transmission inputs, the second port 32 entering circulator 3 is exported from its passband port 42, export from the 3rd port 33 of circulator 3 again and enter optical filter 7, described optical filter 7 is for the spontaneous emission noise outside filtering filter bandwidht, then the second port 82 and the 3rd port 83 of described fiber coupler 8 is entered respectively from the first port 81 of fiber coupler 8, right-hand circular in the resonant cavity that the light wherein entering fiber coupler 8 second port 82 enters laser of the present invention again: the Linear Amplifer of N number of stokes light experience Er-doped fiber 6 and Brillouin amplification, laser generation is formed under two kinds of amplifications, finally export from the 3rd port 83 of fiber coupler 8, the Linear Amplifer resonant cavity loss of N number of Rayleigh scattered light experience Er-doped fiber 6, gain is suitable with loss, and final result is that Rayleigh scattered light remains unchanged substantially, the loss of N number of anti-Stokes light experience Brillouin loss resonant cavity, although also experience the Linear Amplifer of Er-doped fiber 6, gain is less than loss, is finally totally constrained.The part of N number of Brillouin's pump light remnants after Er-doped fiber 6 enters fiber coupler 8 from the second port 82 of fiber coupler 8, then exports from the first port 81 of fiber coupler 8, is intercepted by the 3rd port 33 of circulator.
The gain flattening filter of described optical filter 7 N number of Brillouin's pump wavelength for bandwidth covers, and ensure that N number of Brillouin's stokes light is all in the passband of filter; Described optical filter 7 is for having the comb filter of N number of passband, and all corresponding Brillouin's Stokes optical wavelength of each passband, each passband width is all less than 0.5nm.Described optical filter 7 is Primary Components of the present invention, ensure that laser works of the present invention is in brillouin gain and linear gain coefficient multi-wavelength super-narrow line width BEFL pattern, concrete reason is as follows: the brillouin gain of laser of the present invention and linear gain provide by described Er-doped fiber 6, and the brillouin gain of wherein said Er-doped fiber 6 has narrow bandwidth (about 20MHz), feature that amplitude is little; And its linear gain has band roomy (about 40nm), feature that amplitude is large; But the linear gain of described Er-doped fiber 6 is not uniformity in the bandwidth range of 40nm, and has gain peak at 1530nm place; If without optical filter 7 in laser of the present invention, the then linear gain that provides at N number of Stokes optical wavelength place of described Er-doped fiber 6 and the brillouin gain sum linear gain that will still be less than described Er-doped fiber 6 and provide at 1530nm wavelength place, according to Principles of Laser, laser is by starting of oscillation under the linear gain effect of 1530nm, work in the Erbium doped fiber laser pattern of only linear gain effect, instead of expection brillouin gain and linear gain coefficient multi-wavelength super-narrow line width BEFL pattern; In the resonant cavity of laser of the present invention, introduce optical filter 7, described optical filter 7 ensures the linear gain of described Er-doped fiber 6 uniformity in the free transmission range of described optical filter 7, and the light be in outside described optical filter 7 bandwidth is all by filtering; N number of stokes light is positioned at described optical filter 7 passband, is jointly amplified by the linear gain of described Er-doped fiber 6 and brillouin gain; Non-stokes light in described optical filter 7 passband is only amplified by the linear gain of described Er-doped fiber 6; Light outside described optical filter 7 passband is all by filtering; According to Principles of Laser, only N number of stokes light meets condition of resonance, can form laser generation.Therefore say that described optical filter 7 is Primary Components of laser of the present invention.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.This invention is intended to the various modification contained in the spirit and scope of appended claims.
Claims (6)
1. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser, it is characterized in that: described laser by having Brillouin's pump laser source (1) that N number of different wave length exports, N × 1 coupler (2), circulator (3), wavelength division multiplexer (4), Er-doped fiber (5), Er-doped fiber pump light source (6), optical filter (7) and fiber coupler (8) form, N >=2, the Laser output of N number of different wave length of described Brillouin's pump laser source (1) is connected to first port (31) of circulator (3) through N × 1 coupler (2) by N root optical fiber, second port (32) of described circulator (31) by Fiber connection to the reflector port of wavelength division multiplexer (4), described Er-doped fiber pump light source (6) by Fiber connection to the passband port of wavelength division multiplexer (4), second port (82) of fiber coupler (8) is connected to again after public port connection Er-doped fiber (5) of described wavelength division multiplexer (4), 3rd port (33) of described circulator (3) is connected to first port (81) of fiber coupler (8) by optical filter (7), 3rd port (83) of described fiber coupler (8) is for Output of laser, the gain flattening filter of described optical filter (7) N number of Brillouin's pump wavelength for bandwidth covers, and ensure that N number of Brillouin's stokes light is all in the passband of filter, the wavelength interval of N number of laser that described Brillouin's pump laser source (1) exports is not less than 50GHz.
2. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterized in that: described optical filter (7) comb filter with N number of passband substitutes, the all corresponding Brillouin's Stokes optical wavelength of each passband of described comb filter, the width of each passband is all less than 0.5nm.
3. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, it is characterized in that: described Brillouin's pump laser source (1) is for having the separate unit Brillouin pump laser of N number of different output wavelength, or N platform has Brillouin's pump laser of different output wavelength.
4. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, is characterized in that: the pump mode of described Er-doped fiber (5) is single forward pumping, single backward pump or two directional pump.
5. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as claimed in claim 1, is characterized in that: the semiconductor laser that described Er-doped fiber pump light source (6) is 980nm or the semiconductor laser of 1480nm.
6. a multi-wavelength super-narrow line width Brillouin erbium-doped fiber laser as described in claim 1 to 5 arbitrary, is characterized in that: described Er-doped fiber (5) erbium-ytterbium co-doped fiber or the bismuth co-doped optical fiber of erbium substitute.
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| CN106410599A (en) * | 2016-10-31 | 2017-02-15 | 华南理工大学 | Brillouin single-longitudinal-mode frequency-shift fiber laser |
| 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 |
| CN109698460A (en) * | 2019-02-28 | 2019-04-30 | 南京邮电大学 | A kind of multi-wavelength Brillouin-Er-doped fiber accidental laser of partly beginning to speak |
| WO2019120270A1 (en) * | 2017-12-22 | 2019-06-27 | Huawei Technologies Co., Ltd. | Narrow linewidth multi-wavelength light sources |
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Cited By (6)
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| CN106410599A (en) * | 2016-10-31 | 2017-02-15 | 华南理工大学 | Brillouin single-longitudinal-mode frequency-shift fiber laser |
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| CN109698460A (en) * | 2019-02-28 | 2019-04-30 | 南京邮电大学 | A kind of multi-wavelength Brillouin-Er-doped fiber accidental laser of partly beginning to speak |
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