CN103956640A - Wavelength switchable fiber laser based on graphene and core shift structure - Google Patents
Wavelength switchable fiber laser based on graphene and core shift structure Download PDFInfo
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- CN103956640A CN103956640A CN201410212880.9A CN201410212880A CN103956640A CN 103956640 A CN103956640 A CN 103956640A CN 201410212880 A CN201410212880 A CN 201410212880A CN 103956640 A CN103956640 A CN 103956640A
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Abstract
A wavelength switchable fiber laser based on graphene and a core shift structure is formed by a pump source, a wavelength division multiplexer, an Er-doped fiber, a capillary tube, the graphene, a circulator, a fiber bragg grating, the standard single mode fiber core shift structure, a variable optical attenuator and an optical coupler which are connected in series through standard single mode fibers to form a loop resonant cavity. The capillary tube is filled with the standard single mode fibers with graphene solution coated on the end faces, an output end e of the circulator is sequentially connected with the fiber bragg grating and the standard single mode fiber core shift structure in series, and an output end j of the optical coupler serves as the output end of the fiber laser. The wavelength switchable fiber laser has the advantages that the graphene is connected with the loop resonant cavity so that mode competition effect generated by the Er-doped fiber can be inhibited effectively, and one or double wave lengths switchable stable output can be achieved by taking the standard single mode fiber core shift structure and the fiber bragg grating as comb filters and utilizing tuning of the variable optical attenuator. Furthermore, the wavelength switchable fiber laser is simple in structure, low in cost and remarkable in technological economy effect.
Description
Technical field
The invention belongs to high speed optical fiber communication and laser technology field, particularly a kind of wavelength based on Graphene and core shift structure can switch fiber laser.
Background technology
Laser is the focus of current speed fiber optic communication systems area research.Fiber laser develop forward multifunction, practical future development.Due to mode competition effect stronger in laser, be difficult at room temperature obtain stable Laser output.Had at present a lot of methods to overcome this difficult problem: cooling such as Er-doped fiber is put into liquid nitrogen, utilize the four-wave mixing effect of highly nonlinear optical fiber, strengthen polarisation hole-burning effect etc.With respect to traditional laser, novel substance Graphene, with its exclusive optical characteristics, can be used as nonlinear dielectric and puts into the mode competition that loop resonant cavity suppresses erbium fibre, realizes the stable output of laser, has the simple feature with low cost of technique.
Wavelength can switch fiber laser in all many-sides, have a wide range of applications.The for example computing of wavelength-division multiplex system, optical fiber telecommunications system, optical fiber sensing system, light signal and the measurement of optics, is particularly applied in the light source of current high speed WDM network wavelength route.Realizing the means that wavelength can switch fiber laser has a lot, mainly contains at present: the Fiber Bragg Grating FBG of cascade, multistage birefringence Sagnac fiber loop mirror, be carved with Prague highly nonlinear optical fiber, be carved with the multimode fiber in Prague etc.
Summary of the invention
The wavelength that the object of the invention is to realize a kind of low cost, high stability can switch fiber laser.
Technical scheme of the present invention:
A kind of wavelength based on Graphene and core shift structure can switch fiber laser, by 980nm/1480nm pumping source, wavelength division multiplexer, Er-doped fiber, capillary, Graphene, circulator, bragg grating, standard single-mode fiber core shift structure, variable optical attenuator with 10:90 optical coupler forms and be connected in series and formed loop resonant cavity by standard single-mode fiber, three ports of wavelength division multiplexer are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source; Length capillaceous is that 3cm, diameter are 126 μ m, and the standard single-mode fiber that one section of end face is coated with graphene solution is housed in capillary, and this standard single-mode fiber diameter mates with capillary diameter; Three ports of circulator are respectively input d and output e, Ausgang, wherein input d is connected with insertion standard single-mode fiber capillaceous, output e is connected in series by standard single-mode fiber with bragg grating and standard single-mode fiber core shift structure successively, and Ausgang is connected with variable optical attenuator; Four ports of optical coupler are respectively input g, input h, output i and output j, wherein input g is connected with the output of variable optical attenuator, input h is connected with the output of standard single-mode fiber core shift structure, output i is connected with the input c of wavelength division multiplexer, the output that output j is whole fiber laser.
The preparation method of described standard single-mode fiber core shift structure, step is as follows:
1) a segment standard monomode fiber and interlude standard single-mode fiber are carried out to core shift welding, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine;
2) intercepting interlude standard single-mode fiber length is 3-5cm;
3) the 3rd segment standard monomode fiber and the interlude standard single-mode fiber after intercepting are carried out to core shift welding again, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine, can make standard single-mode fiber core shift structure.
Working mechanism of the present invention:
Graphene is a kind of novel substance material, has unique nonlinear optical properties, and manufacture craft is simple; Compare with other nonlinear dielectrics as lower in costs such as photonic crystal fiber, dispersion shifted optical fibers; Be applied to its unique character in fiber laser and can greatly reduce cavity loss.Therefore, Graphene is that a kind of mode competition that can suppress Er-doped fiber produces the novel medium of stabilized lasers output.Realizing on the basis of laser stabilization output, the core shift structure consisting of standard single-mode fiber in loop resonant cavity, according to principle of interference, can be used as the generation that a kind of comb filter can realize laser.By the first paragraph standard single-mode fiber of core shift structure and Bragg grating cascade, the comb spectrum forming for standard single-mode fiber core shift structure, can produce a transmission peaks due to the impact of Bragg grating, thereby can realize the output of single wavelength.Variable optical attenuator is linked in loop resonant cavity, originally arranges and decay to zero, due to the existence of core shift structure insertion loss, can only be in the centre wavelength position of grating
observe the generation of single laser; Regulate variable attenuator, when loss is greater than the insertion loss of core shift structure generation, can only in the passband of core shift structure, observe single laser
; In addition, when the loss of variable attenuator generation equates with the insertion loss of core shift structure, can exist, simultaneously
with
place observes the output of dual-wavelength laser.Therefore by changing variable optical attenuator control chamber internal loss, can realize single-double wave long can switch.
Advantage of the present invention and beneficial effect are:
Graphene is linked in loop resonant cavity as a kind of novel non-linearity medium, can effectively suppress the mode competition effect that Er-doped fiber produces, and matching standard monomode fiber core shift structure produces single wavelength laser as comb filter, the introducing of Bragg grating can realize the output of single wavelength equally, and by variable optical attenuator, the adjusting of cavity loss is realized to the stable output that single-double wave length can switch; This optical fiber laser structure is simple, cost is low easy to implement, and techno-economic effect is remarkable, is suitable for applying.
Accompanying drawing explanation
Fig. 1 for this wavelength can switch optical fiber laser structure schematic diagram.
Fig. 2 is standard single-mode fiber core shift structure enlarged diagram.
In figure: 1.980nm/1480nm pumping source 2. wavelength division multiplexer 3. Er-doped fiber 4. capillary 5. Graphene 6. circulator 7. bragg grating 8. standard single-mode fiber core shift structure 9. variable optical attenuator 10.10:90 optical coupler 11. standard single-mode fibers.
Fig. 3 is the transfer function analogous diagram of standard single-mode fiber core shift structure and bragg grating cascade.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Embodiment:
A kind of wavelength based on Graphene and core shift structure can switch fiber laser, as shown in Figure 1, by 980nm/1480nm pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, capillary 4, Graphene 5, circulator 6, bragg grating 7, standard single-mode fiber core shift structure 8, variable optical attenuator 9 with 10:90 optical coupler 10 forms and be connected in series and formed loop resonant cavity by standard single-mode fiber, three ports of wavelength division multiplexer 2 are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source 1; The length of capillary 4 is that 3cm, diameter are 126 μ m, and the standard single-mode fiber that one section of end face is coated with Graphene 5 solution is housed in capillary 4, and this standard single-mode fiber diameter mates with capillary 4 diameters; Three ports of circulator 6 are respectively input d and output e, Ausgang, wherein input d is connected with the standard single-mode fiber that inserts capillary 4, output e is connected in series by standard single-mode fiber with bragg grating 7 and standard single-mode fiber core shift structure 8 successively, and Ausgang is connected with variable optical attenuator 9; Four ports of optical coupler 10 are respectively input g, input h, output i and output j, wherein input g is connected with the output of variable optical attenuator 9, input h is connected with the output of standard single-mode fiber core shift structure 8, output i is connected with the input c of wavelength division multiplexer 2, the output that output j is whole fiber laser.
The preparation method of described standard single-mode fiber core shift structure, step is as follows:
1) a segment standard monomode fiber and interlude standard single-mode fiber are carried out to core shift welding, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine;
2) intercepting interlude standard single-mode fiber length is 3-5cm;
3) the 3rd segment standard monomode fiber and the interlude standard single-mode fiber after intercepting are carried out to core shift welding again, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine, can make standard single-mode fiber core shift structure, as shown in Figure 2.
Fig. 3 is the transfer function analogous diagram of standard single-mode fiber core shift structure and bragg grating cascade, in figure, show: the transmission spectrum of standard single-mode fiber core shift structure becomes to have periodic passband, after Bragg grating cascade, there is the transmission paddy that a grating forms in passband.While is due to the reflex in Prague, at another loop shape resonant cavity by circulator, there will be a reflection peak and transmission paddy to offset, so the filter that standard single-mode fiber core shift structure forms there will be a single wavelength laser at the maximum gain place of Er-doped fiber.
The job analysis of this embodiment: pump light has obtained gain through the port b of wavelength division multiplexer 2 input Er-doped fiber 3, after by Bragg grating 7 and standard single-mode fiber core shift structure 8 and the process adjusting of variable optical attenuator 9, can realize the output of single wavelength, dual-wavelength laser and the conversion between wavelength.Light, by being coated with after the standard single-mode fiber of Graphene 5, has played certain frequency stabilization effect, has and utilizes the stable of dual wavelength.These light are got back to wavelength division multiplexer 2 through the output i of 10:90 coupler 10, through output j Output of laser.The introducing of Bragg grating 7 produces the output of single wavelength laser, the standard single-mode fiber core shift structure that standard single-mode fiber 11 is fused into plays certain comb filtering effect, can realize the output of single wavelength, being used in conjunction with of variable optical attenuator, has realized the output that wavelength can switch laser.
Claims (2)
1. the wavelength based on Graphene and core shift structure can switch fiber laser, it is characterized in that: by 980nm/1480nm pumping source, wavelength division multiplexer, Er-doped fiber, capillary, Graphene, circulator, bragg grating, standard single-mode fiber core shift structure, variable optical attenuator with 10:90 optical coupler forms and be connected in series and formed loop resonant cavity by standard single-mode fiber, three ports of wavelength division multiplexer are respectively input a, output b and input c, and wherein input a is connected with 980nm/1480nm pumping source; Length capillaceous is that 3cm, diameter are 126 μ m, and the standard single-mode fiber that one section of end face is coated with graphene solution is housed in capillary, and this standard single-mode fiber diameter mates with capillary diameter; Three ports of circulator are respectively input d and output e, Ausgang, wherein input d is connected with insertion standard single-mode fiber capillaceous, output e is connected in series by standard single-mode fiber with bragg grating and standard single-mode fiber core shift structure successively, and Ausgang is connected with variable optical attenuator; Four ports of optical coupler are respectively input g, input h, output i and output j, wherein input g is connected with the output of variable optical attenuator, input h is connected with the output of standard single-mode fiber core shift structure, output i is connected with the input c of wavelength division multiplexer, the output that output j is whole fiber laser.
2. the wavelength based on Graphene and core shift structure can switch fiber laser according to claim 1, it is characterized in that: the preparation method of described standard single-mode fiber core shift structure, and step is as follows:
1) a segment standard monomode fiber and interlude standard single-mode fiber are carried out to core shift welding, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine;
2) intercepting interlude standard single-mode fiber length is 3-5cm;
3) the 3rd segment standard monomode fiber and the interlude standard single-mode fiber after intercepting are carried out to core shift welding again, discharge capacity 200 bit, core shift amount is less than 9 μ m and controls core shift distance by controlling the stepping motor of heat sealing machine, can make standard single-mode fiber core shift structure.
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Cited By (6)
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| CN104390655A (en) * | 2014-09-19 | 2015-03-04 | 天津理工大学 | High-sensitivity fiber laser sensor based on core raised structure |
| CN105140767A (en) * | 2015-09-18 | 2015-12-09 | 华中科技大学 | Dual-wavelength single-longitudinal-mode fiber laser |
| CN105807373A (en) * | 2016-04-28 | 2016-07-27 | 北京信息科技大学 | Wavelength on-off control method based on electrode discharge and graphene coated fiber bragg gratings |
| CN105974521A (en) * | 2016-04-28 | 2016-09-28 | 北京信息科技大学 | Electrode discharge and graphene coated optical fiber grating-based wavelength switching device |
| CN106054316A (en) * | 2016-08-12 | 2016-10-26 | 重庆大学 | Integrated all-fiber interference-type light modulator based on graphene and manufacturing method thereof |
| CN113131317A (en) * | 2021-03-03 | 2021-07-16 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104390655A (en) * | 2014-09-19 | 2015-03-04 | 天津理工大学 | High-sensitivity fiber laser sensor based on core raised structure |
| CN105140767A (en) * | 2015-09-18 | 2015-12-09 | 华中科技大学 | Dual-wavelength single-longitudinal-mode fiber laser |
| CN105807373A (en) * | 2016-04-28 | 2016-07-27 | 北京信息科技大学 | Wavelength on-off control method based on electrode discharge and graphene coated fiber bragg gratings |
| CN105974521A (en) * | 2016-04-28 | 2016-09-28 | 北京信息科技大学 | Electrode discharge and graphene coated optical fiber grating-based wavelength switching device |
| CN105807373B (en) * | 2016-04-28 | 2018-08-17 | 北京信息科技大学 | Lambda switch control method based on electrode discharge and graphene coated fiber grating |
| CN105974521B (en) * | 2016-04-28 | 2018-11-27 | 北京信息科技大学 | A kind of wavelength switch device based on electrode discharge and graphene coated fiber grating |
| CN108919427A (en) * | 2016-04-28 | 2018-11-30 | 北京信息科技大学 | Lambda switch system based on electrode discharge and graphene coated fiber grating |
| CN108919427B (en) * | 2016-04-28 | 2020-09-11 | 北京信息科技大学 | Wavelength switch system based on electrode discharge and graphene coated fiber grating |
| CN106054316A (en) * | 2016-08-12 | 2016-10-26 | 重庆大学 | Integrated all-fiber interference-type light modulator based on graphene and manufacturing method thereof |
| CN113131317A (en) * | 2021-03-03 | 2021-07-16 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
| CN113131317B (en) * | 2021-03-03 | 2022-05-10 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
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