CN103441414A - Dual-wavelength fiber laser based on phase-shift sampling gratings - Google Patents
Dual-wavelength fiber laser based on phase-shift sampling gratings Download PDFInfo
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Abstract
The invention relates to a dual-wavelength fiber laser based on phase-shift sampling gratings. Parameters of the phase-shift sampling gratings are designed to achieve the effect of dual-crest filtering, according to the laser, the phase-shift sampling gratings are inscribed in doped fibers which are used as incentive material of the laser, the phase-shift sampling gratings are used for forming a resonant cavity of the laser to perform the dual-crest filtering and mode selection, and finally dual-wavelength laser output is obtained. The dual-wavelength fiber laser is characterized in that changes of insertion phase shift magnitude and an insertion phase shift position can affect the output wavelength and the threshold value of the laser. If the phase shift position is fixed and the phase shift magnitude is changed, the wavelength can shift toward a short wavelength or a long wavelength along with decrease or increase of the insertion phase shift magnitude; if the phase shift position is changed, and the phase shift magnitude is fixed, the threshold value of the laser can change along with the deviating extent of the phase shift position from the grating centers.
Description
Technical field
The invention belongs to fiber grating and fiber laser field, be specifically related to the dual wavelength fibre laser of phase shift sampled-grating.
Background technology
In recent years, along with further developing of Fibre Optical Communication Technology and fiber laser, except high-capacity optical fiber laser is the large focus of international research one, research for dual wavelength fibre laser is also more and more noticeable, as its name suggests, dual wavelength fibre laser is the laser that take of forming of the full optical device output wavelength number of channels that optical fiber is main transmission medium is two passages, because of the superior function that the fields such as its generation at light sensing, wavelength division multiplexing, microwave and millimeter wave, spectral measurement demonstrate, paid close attention to widely.The dual laser that application phase-shifted grating or sampled-grating form at present, its advantage is that wavelength interval is stable, compact conformation, be easy to carry etc.What in the present invention, utilize is the phase shift sampled-grating, and it can realize the filtering of arrowband more than phase-shifted grating and sampled-grating structure, more is conducive to the selection of zlasing mode.
Summary of the invention
The purpose of this invention is to provide a kind of device and implementation method that produces dual wavelength fibre laser.
This laser is scribed at the phase shift sampled-grating on doped fiber, utilizes the excitation material of doped fiber as laser, utilizes the phase shift sampled-grating to form the resonant cavity of fiber laser, carries out bimodal filtering and model selection, finally obtains dual-wavelength laser output.
Dual wavelength fibre laser (see figure 1) based on the phase shift sampled-grating provided by the invention, comprise the laser resonant cavity (3) that pumping source (1), isolator (2), phase shift sampled-grating form, the output of pumping source is connected with the input port of isolator (2-1); The output port of isolator (2-2) is connected with an end of the laser resonant cavity (3) that the phase shift sampled-grating forms, the output that the other end of the laser resonant cavity (3) that the phase shift sampled-grating forms is this laser.
Described phase shift sampled-grating is to insert phase shift P to form on a sampled-grating, and this sampled-grating is L by a length
1uniform fiber grating and a length be L
2no-raster optical fiber be alternately distributed formation, L wherein
2the equivalent phase shift of no-raster optical fiber is π, and the Nei，Qie insertion position, grid region that above-mentioned phase shift P is positioned at sampled-grating makes grid region, the left and right 0.5L of being respectively equal in length
1, its concrete structure is: ... L
1l
2l
1l
20.5 L
1p 0.5L
1l
2l
1l
2l
1, see Fig. 2.
In described phase shift sampled-grating, no-raster optical fiber equivalence π phase shift refers to the odd-multiple that phase-shift phase is π, and its phase-shift phase is by formula 4 π n
effl
2/ λ determines, n
effeffective refractive index, L
2be the length of no-raster optical fiber, λ is oscillation wavelength in laser.
The implementation method of the above-described dual wavelength fibre laser based on the phase shift sampled-grating comprises the following steps:
(1) the phase shift sampled-grating is scribed on high-concentration dopant optical fiber; as resonant cavity, be linked in the structure of laser; the pump light of pumping source output is in being input to the laser resonant cavity structure consisted of the phase shift sampled-grating after isolator, the effect of isolator is the impact of the laser do not exported in Stimulated Light device resonant cavity of protection pumping source.
(2) doped fiber is as gain media, realize population inversion under the pump light effect of pumping source output, the Main Function of the phase shift sampled-grating on doped fiber is that bimodal filtering and zlasing mode are selected, it can carry out frequency-selecting to the light wave existed in laser resonant cavity, thereby obtains the output of dual-wavelength laser.
(3) when the gain in laser resonant cavity is greater than loss, the laser starting of oscillation; When pump light is greater than laser threshold, outputting dual wavelength laser.
In above-mentioned steps (1) and (2), said phase shift sampled-grating inserts the invariant position of phase shift P, while change inserting phase shift P big or small, can affect the position of transmission peaks in the phase shift sampled-grating, and then the output wavelength of the dual laser of impact output.When the phase-shift phase inserted is π, transmission peaks is positioned at the central authorities of reflection bandwidth, and when phase-shift phase reduces, transmission peaks can move to short wavelength's direction; When phase-shift phase increases, transmission peaks can move to long wavelength's direction.The wavelength of laser output can change along with the size of phase shift P, but wavelength interval is constant.
The size that in above-mentioned steps (1) and (2), said phase shift sampled-grating inserts phase shift P is constant, changes the position of inserting phase shift P, can affect the transmission peaks transmissivity size of phase shift sampled-grating, and then the threshold value of the dual laser of impact output.When phase shift P position is positioned at the grating mid point, the transmissivity maximum of phase shift sampled-grating, the threshold value of laser is minimum, when phase shift P position deviation grating mid point changes hour, transmission change is less, and the threshold value of laser is lower, when phase shift P position deviation grating mid point changes greatly, its transmissivity meeting severe attrition, the threshold value of laser is larger.
In above-mentioned steps (2), the bimodal filtering characteristic of said phase shift sampled-grating and zlasing mode select implementation procedure to be: the multicycle sampled-grating that equivalent phase shift is π has two reflection windows that reflectivity is higher, insert again phase shift on this sampled-grating, can be in original dual wavelength reflectance spectrum, open the transmission window of arrowband, realize the dual wavelength filtering of arrowband more, more be conducive to the selection of zlasing mode.
principle of the present invention:
From the laser principle, the output of laser is to be determined by the reflectance spectrum of resonant cavity, the gain spectral of excitation material and the pattern of the light wave that can exist in resonant cavity.In the present invention, the gain spectral that the gain spectral of doped fiber is the excitation material and the spectrum of phase shift sampled-grating have determined the pattern that can vibrate in resonant cavity.Because the gain spectral of doped fiber is very wide, so the output of the dual wavelength fibre laser in the present invention is determined jointly by reflectance spectrum and the phase shift sampled-grating transmission spectrum of sampled-grating.
advantage of the present invention and beneficial effect:
(1) the phase shift sampled-grating laser chamber that the present invention inscribes on high-concentration dopant optical fiber is short, and volume is little; (2) project organization of the present invention is simple and easy flexible, and external influence factor is few, and insertion loss is low; (3) the present invention can pass through the parameter of adjusted design phase shift sampled-grating, realizes different dual-wavelength laser output; (4) the present invention is owing to inserting phase shift point in sampled-grating, thereby can obtain the dual wavelength filtering of arrowband more, thereby can more be conducive to the realization of single-longitudinal-mode fiber laser.
The accompanying drawing explanation
The structural representation that Fig. 1 is fiber laser of the present invention, 1-pumping source wherein, 2-isolator, the laser resonant cavity that 3-phase shift sampled-grating forms, the input port that 2-1 is isolator, the output port that 2-2 is isolator.
Fig. 2 is phase shift sampled-grating structural representation in Fig. 1.The phase-shift phase that the P representative is inserted in grating; T wherein
1for the sampling period; L
1for uniform grating length in sampled-grating; L
2for no-raster fiber lengths in sampled-grating, its equivalent phase shift is the π phase shift.
The structure I schematic diagram that Fig. 3 is fiber laser phase shift sampled-grating of the present invention, wherein P
1the left and right sampled-grating in some grid region, place is equal and be 7 times of sampling periods, and the phase-shift phase size is π; T wherein
1for the sampling period; L
1for uniform grating in sampled-grating; L
2for no-raster optical fiber in sampled-grating, its equivalent phase shift is the π phase shift.
The structure I I schematic diagram that Fig. 4 is fiber laser phase shift sampled-grating of the present invention, wherein P
2the left and right sampled-grating in some grid region, place is equal and be 7 times of sampling periods, and the phase-shift phase size is 0.8 π; T wherein
1for the sampling period; L
1for uniform grating in sampled-grating; L
2for no-raster optical fiber in sampled-grating, its equivalent phase shift is the π phase shift.
The structure III schematic diagram that Fig. 5 is fiber laser phase shift sampled-grating of the present invention, wherein P
3the left and right sampled-grating in some grid region, place is equal and be 7 times of sampling periods, and the phase-shift phase size is 1.2 π; T wherein
1for the sampling period; L
1for uniform grating in sampled-grating; L
2for no-raster optical fiber in sampled-grating, its equivalent phase shift is the π phase shift.
The structure I I schematic diagram that Fig. 6 is fiber laser phase shift sampled-grating of the present invention, wherein the left and right sampled-grating in grid region, P point place is respectively 6 times and 8 times of sampling periods, and the phase-shift phase size is π; T wherein
1for the sampling period; L
1for uniform grating in sampled-grating; L
2for no-raster optical fiber in sampled-grating, its equivalent phase shift is the π phase shift.
The structure I I schematic diagram that Fig. 7 is fiber laser phase shift sampled-grating of the present invention, wherein the left and right sampled-grating in grid region, P point place is respectively 7 times and 9 times of sampling periods, and the phase-shift phase size is π; T wherein
1for the sampling period; L
1for uniform grating in sampled-grating; L
2for no-raster optical fiber in sampled-grating, its equivalent phase shift is the π phase shift.
Fig. 8, for being 7 times of sampling periods, inserts laser output spectrum figure when phase-shift phase is big or small is π.
Fig. 9 is for being 7 times of sampling periods, the laser output spectrum figure when inserting the phase-shift phase size and being 0.8 π.
Figure 10 is for being 7 times of sampling periods, the laser output spectrum figure when inserting the phase-shift phase size and being 1.2 π.
Figure 11 is 6 times and 8 times of sampling periods, inserts laser output spectrum figure when phase-shift phase is big or small is π.
Figure 12 is 7 times and 9 times of sampling periods, inserts laser output spectrum figure when phase-shift phase is big or small is π.
Embodiment
As shown in Figure 1, dual wavelength fibre laser based on the phase shift sampled-grating, comprise the laser resonant cavity (3) that pumping source (1), isolator (2), phase shift sampled-grating form, the output of pumping source is connected with the input port of isolator (2-1); The output port of isolator (2-2) is connected with an end of the laser resonant cavity (3) that the phase shift sampled-grating forms, the output that the other end of the laser resonant cavity (3) that the phase shift sampled-grating forms is this laser.
Pumping source in the present invention (1) is the 980nm pumping source, and isolator (2) is 980nm/C band of light wavelength division multiplexer (being WDM), the laser resonant cavity structure of the laser resonant cavity (3) that the phase shift sampled-grating forms for forming on erbium-ytterbium co-doped fiber.
In figure, pumping source (1) provides the continuous pump light of 980nm; WDM(2) play the light wave coupling of 1550nm and 980nm and the effect of beam splitting, and the laser produced is played to buffer action; The phase shift sampled-grating is inscribed on erbium-ytterbium co-doped fiber, not only as resonant cavity but also play the frequency-selecting effect.
As shown in Figure 2, the phase shift sampled-grating is first sampled and then is inserted in sampled-grating a phase shift and formed in one section optical fiber, each sampled-grating is the uniform sampling grating, and each sampling period is comprised of uniform grating part and no-raster fiber section, and its duty ratio is 0.75.
?
embodiment 1,
The continuous pump light of 980nm (1) is from WDM(2) 980nm port input, pump light (1) passes through WDM(2) be transferred to the 980nm/1550nm port and export and enter on the erbium-ytterbium co-doped fiber of having inscribed the phase shift sampled-grating.
Phase shift sampled-grating structure I (see figure 3), the phase shift sampled-grating parameter wherein be scribed on erbium-ytterbium co-doped fiber is: the grating cycle is 530.47nm, effective refractive index 1.46, sampling period is 4000 grating cycles, and sample length is 3000.425 grating cycles, 14 sampling periods, the sampled-grating of both sides, grid region, place, phase shift insertion point is equal in length and be all 7 times of sampling period, the phase-shift phase size is π, and duty ratio is 75%, and the laser output spectra of this structure is shown in accompanying drawing 8.
?
The continuous pump light of 980nm (1) is from WDM(2) 980nm port input, pump light (1) passes through WDM(2) be transferred to the 980nm/1550nm port and export and enter on the erbium-ytterbium co-doped fiber of having inscribed the phase shift sampled-grating.
Phase shift sampled-grating structure I I(is shown in Fig. 4), the phase shift sampled-grating parameter wherein be scribed on erbium-ytterbium co-doped fiber is: the grating cycle is 530.47nm, effective refractive index 1.46, sampling period is 4000 grating cycles, and sample length is 3000.425 grating cycles, 14 sampling periods, the sampled-grating of both sides, grid region, place, phase shift insertion point is equal in length and be all 7 times of sampling period, the phase-shift phase size is 0.8 π, and duty ratio is 75%, and the laser output spectra of this structure is shown in accompanying drawing 9.
The continuous pump light of 980nm (1) is from WDM(2) 980nm port input, pump light (1) passes through WDM(2) be transferred to the 980nm/1550nm port and export and enter on the erbium-ytterbium co-doped fiber of having inscribed the phase shift sampled-grating.
Phase shift sampled-grating structure III (see figure 5), the phase shift sampled-grating parameter wherein be scribed on erbium-ytterbium co-doped fiber is: the grating cycle is 530.47nm, effective refractive index 1.46, sampling period is 4000 grating cycles, and sample length is 3000.425 grating cycles, 14 sampling periods, the sampled-grating of both sides, grid region, place, phase shift insertion point is equal in length and be all 7 times of sampling period, the phase-shift phase size is 1.2 π, and duty ratio is 75%, and the laser output spectra of this structure is shown in accompanying drawing 10.
embodiment 4,
The continuous pump light of 980nm (1) is from WDM(2) 980nm port input, pump light (1) passes through WDM(2) be transferred to the 980nm/1550nm port and export and enter on the erbium-ytterbium co-doped fiber of having inscribed the phase shift sampled-grating.
Phase shift sampled-grating structure I V(is shown in Fig. 6), the phase shift sampled-grating parameter that wherein is scribed at erbium-ytterbium co-doped fiber is: the grating cycle is 530.47nm, effective refractive index 1.46, sampling period is 4000 grating cycles, sample length is 3000.425 grating cycles, and 14 sampling periods, the sampled-grating length of both sides, grid region, place, phase shift insertion point is respectively 6 times and 8 times of sampling period, inserting the phase-shift phase size is π, and the laser output spectra of this structure is shown in Figure 11.
embodiment 5,
The continuous pump light of 980nm (1) is from WDM(2) 980nm port input, pump light (1) passes through WDM(2) be transferred to the 980nm/1550nm port and export and enter on the erbium-ytterbium co-doped fiber of having inscribed the phase shift sampled-grating.
Phase shift sampled-grating structure V(is shown in Fig. 7), the phase shift sampled-grating parameter wherein be scribed on erbium-ytterbium co-doped fiber is: the grating cycle is 530.47nm, effective refractive index 1.46, sampling period is 4000 grating cycles, sample length is 3000.425 grating cycles, and 16 sampling periods, the sampled-grating length of both sides, grid region, place, phase shift insertion point is respectively 7 times and 9 times of sampling period, inserting the phase-shift phase size is π, and the laser output spectra of this structure is shown in Figure 12.
Claims (7)
1. the dual wavelength fibre laser based on the phase shift sampled-grating, comprise the laser resonant cavity structure (3) that pumping source (1), isolator (2), phase shift sampled-grating form, the output of pumping source is connected with the input port of isolator (2-1); The output port of isolator (2-2) is connected with an end of the laser resonant cavity structure (3) that the phase shift sampled-grating forms; The output that the other end of the laser resonant cavity structure (3) that the phase shift sampled-grating forms is this laser.
?
2. the dual wavelength fibre laser based on the phase shift sampled-grating according to claim 1, is characterized in that above-mentioned phase shift sampled-grating is to insert phase shift P to form on a sampled-grating, and this sampled-grating is L by a length
1uniform fiber grating and a length be L
2no-raster optical fiber be alternately distributed formation, L wherein
2the equivalent phase shift of no-raster optical fiber is π, and the Nei，Qie insertion position, grid region that above-mentioned phase shift P is positioned at sampled-grating makes grid region, the left and right 0.5L of being respectively equal in length
1, its concrete structure is: ... L
1l
2l
1l
20.5 L
1p 0.5L
1l
2l
1l
2l
1
3. the dual wavelength fibre laser based on the phase shift sampled-grating according to claim 2, is characterized in that in described phase shift sampled-grating, no-raster optical fiber equivalence π phase shift refers to the odd-multiple that phase-shift phase is π, and its phase-shift phase is by formula 4 π n
effl
2/ λ determines, n
effeffective refractive index, L
2be the length of no-raster optical fiber, λ is oscillation wavelength in laser.
4. the implementation method of the described dual wavelength fibre laser of any one in a claims 1 to 3 is characterized in that the method comprises the following steps:
(1) the phase shift sampled-grating is scribed on high-concentration dopant optical fiber, as resonant cavity, be linked in the structure of laser, the pump light of pumping source output is in being input to the laser resonant cavity structure consisted of the phase shift sampled-grating after isolator, the effect of isolator is the impact of the laser do not exported in Stimulated Light device resonant cavity of protection pumping source;
(2) above-mentioned doped fiber is as gain media, realize population inversion under the pump light effect of pumping source output, the Main Function of the phase shift sampled-grating on doped fiber is bimodal filtering, it can carry out frequency-selecting to the light wave existed in laser resonant cavity, thereby obtains the output of dual-wavelength laser;
(3) when the gain in laser resonant cavity is greater than loss, the laser starting of oscillation; When pump light is greater than laser threshold, outputting dual wavelength laser.
5. method according to claim 4, it is characterized in that, phase shift sampled-grating described in step (1) and (2) inserts the invariant position of phase shift P, while change inserting phase shift P big or small, can change the position of transmission peaks in the phase shift sampled-grating, and then the output wavelength of the dual laser of impact output; When the phase-shift phase inserted is π, transmission peaks is positioned at the central authorities of reflection bandwidth, and when phase-shift phase reduces or increase, transmission peaks can move to long wavelength or short wavelength's direction; The wavelength of laser output can change along with the size of phase shift P, but wavelength interval is constant.
6. method according to claim 4, it is characterized in that, it is constant that phase shift sampled-grating described in step (1) and (2) inserts the size of phase shift P, while changing the position of inserting phase shift P, can affect the transmission peaks transmissivity size of phase shift sampled-grating, and then the threshold value of the dual laser of impact output; When phase shift P position is positioned at the grating mid point, the transmissivity maximum of phase shift sampled-grating, the threshold value of laser is minimum, when phase shift P position deviation grating mid point changes hour, transmission change is less, and the threshold value of laser is lower, when phase shift P position deviation grating mid point changes greatly, its transmissivity meeting severe attrition, the threshold value of laser is larger.
7. method according to claim 4, it is characterized in that, the bimodal filtering characteristic of the phase shift sampled-grating described in step (2) and zlasing mode select implementation procedure to be: the multicycle sampled-grating that equivalent phase shift is π has two reflection windows that reflectivity is higher, insert again phase shift on this sampled-grating, can be in original dual wavelength reflectance spectrum, open the transmission window of arrowband, realize the dual wavelength filtering of arrowband more, more be conducive to the selection of zlasing mode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
| CN111884027A (en) * | 2020-07-28 | 2020-11-03 | 中国人民解放军国防科技大学 | Multi-wavelength fiber laser based on two-dimensional active pi phase shift fiber grating |
| CN113922195A (en) * | 2021-09-30 | 2022-01-11 | 上海频准激光科技有限公司 | Narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser and system |
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| CN101777722A (en) * | 2010-01-26 | 2010-07-14 | 天津理工大学 | Double-wavelength single-longitudinal-mode fiber laser and operating method thereof |
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| CN101777722A (en) * | 2010-01-26 | 2010-07-14 | 天津理工大学 | Double-wavelength single-longitudinal-mode fiber laser and operating method thereof |
Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
| CN109991699B (en) * | 2017-12-29 | 2024-04-16 | 北京交通大学 | 2 mu m wave band phase shift sampling optical fiber grating and manufacturing system and method |
| CN111884027A (en) * | 2020-07-28 | 2020-11-03 | 中国人民解放军国防科技大学 | Multi-wavelength fiber laser based on two-dimensional active pi phase shift fiber grating |
| CN113922195A (en) * | 2021-09-30 | 2022-01-11 | 上海频准激光科技有限公司 | Narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser and system |
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Application publication date: 20131211 |