CN105390911A - All-fiber 2mum-waveband dual wavelength gap-adjustable thulium-doped fiber laser - Google Patents
All-fiber 2mum-waveband dual wavelength gap-adjustable thulium-doped fiber laser Download PDFInfo
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Abstract
The invention discloses an all-fiber 2mum-waveband dual-wavelength gap-adjustable thulium-doped fiber laser, which belongs to the technical field of laser manufacturing. In order to solve defects that the dual wavelength gap is short and external interference is likely to exist in the 2mum-waveband dual wavelength fiber laser, a laser diode pumping source of the laser is connected with a fiber amplifier; the output end of the fiber amplifier is connected with a wavelength division multiplexer; the wavelength division multiplexer is connected with the thulium-doped fiber; the thulium-doped fiber is connected with a 50:50 broadband coupler; the 50:50 broadband coupler is connected with a multimode interference filter, thereby enabling a Sagnac ring to be cascaded with the multimode interference filter to form a composite filter structure; the 50:50 broadband coupler is connected with the input end of an isolator; the output end of the isolator is connected with a 90:10 broadband coupler, and the wavelength division multiplexer and the 90:10 broadband coupler are connected to form a ring-shaped cavity, and the 90:10 broadband coupler carries out 2mum dual-wavelength output.
Description
Technical field
The present invention relates to a kind of all optical fibre structure 2 mu m waveband dual wavelength interval tunable laser based on compound multiple-mode interfence filter, belong to laser manufacturing technology field, this laser can be applicable to the numerous areas such as Microwave photonics, remote sensing, laser radar.
Background technology
2 mu m waveband fiber lasers are one of laser technologies of current most prospect, and at laser medicine, gas detect, the aspects such as free space optical communication have a wide range of applications.Operate in the dual wavelength fibre laser of 2 mu m wavebands more because it has unique advantage in Microwave photonics, optical device context of detection and pay close attention to by people gradually.
Chinese patent " dual-wavelength tunable thulium-doped fiber laser ", publication number is CN101859975, and as shown in Figure 1, this apparatus structure is as follows:
Dual-wavelength tunable mixes rust fiber laser, is made up of the first pumping source 1, second pumping source 2, first pump light condenser lens 3, second pump light condenser lens 4, first dichronic mirror 5, second dichronic mirror 6, thulium doped fiber 7, output laser collimator lens 8, the reflective Volume Bragg grating VBGl10 of feedback end laser collimator lens 9, first, the second reflective Volume Bragg grating VBG211 and broadband medium film high reflection mirror 12.The horizontal optical path of the first pumping source 1 placed successively the first pump light condenser lens 3, first dichronic mirror 5, mix rust optical fiber 7, second dichronic mirror 6, second pump light condenser lens 4 and the second pumping source 2; Output laser collimator lens 8 is placed on the vertical optical path of the first dichronic mirror 5; Reflection end laser collimator lens 9, reflective Volume Bragg grating 10, reflective Volume Bragg grating 11 and broadband medium film high reflection mirror 12 is placed with on the vertical optical path of the second dichronic mirror 6.Two Volume Bragg grating VBG110 and VBG211 are as resonator surface reflecting element, and deielectric-coating speculum 12 wherein helps as auxiliary element the angle tuning realizing VBG.This technical scheme adopts bidirectional pumping structure, by regulating two Volume Bragg grating VBG110 and VBG211, finally obtains the adjustable 50nm in dual wavelength interval.
But, because 2 mu m waveband dual wavelength fibre lasers adopt Volume Bragg grating structure, the performance of Volume Bragg grating limit by preparing grating technique, thus limits dual wavelength interval tuning range, and grating cost is higher, be unfavorable for the development of dual wavelength fibre laser.Meanwhile, the design of non-all optical fibre structure, makes optical fiber need the free space coupling with various function element, and this just needs the lens and the light path aligning governor motion that increase some, so it is subject to external environmental interference, poor practicability.
Summary of the invention
The present invention is shorter in order to solve dual wavelength interval in prior art 2 mu m waveband dual wavelength fibre laser, be subject to the defect of external interference, propose a kind of all optical fibre structure 2 μm of dual wavelength interval tunable laser based on compound multiple-mode interfence filter, the twin wavelength laser output minimum interval 3nm that it obtains, largest interval 80nm, and Side mode suppressing is higher, about 60dB, wavelength stable output, tuning easy, low cost of manufacture.
The present invention takes following technical scheme:
The adjustable thulium-doped fiber laser in all-fiber 2 mu m waveband dual wavelength interval, it is characterized in that, this laser is made up of laser diode pumping source, fiber amplifier, wavelength division multiplexer, thulium doped fiber, 50:50 wide-band coupler, multiple-mode interfence filter, isolator and 90:10 wide-band coupler; Laser diode pumping source connects with fiber amplifier, fiber amplifier output is held with a of wavelength division multiplexer and is connected, the c end of wavelength division multiplexer is connected with thulium doped fiber one end, the thulium doped fiber other end is held with the d of 50:50 wide-band coupler and is connected, the f end of 50:50 wide-band coupler is connected with multiple-mode interfence filter one end, the g end of 50:50 wide-band coupler is connected with the multiple-mode interfence filter other end, thus makes Sagnac ring and the cascade of multiple-mode interfence filter, forms compound filter structure; The e end of 50:50 wide-band coupler is connected with the input of isolator; The output of isolator is held with the k of 90:10 wide-band coupler and is connected, and the b end of wavelength division multiplexer holds with the h of 90:10 wide-band coupler the looping chamber that is connected, and the i end of 90:10 wide-band coupler carries out 2 μm of twin wavelength laser output.
First output i of described 90:10 wide-band coupler is 10% output, and the second output h is 90% output.
The invention has the beneficial effects as follows:
The tunable 2 mu m waveband thulium-doped fiber lasers in output dual wavelength interval of the present invention, it can obtain dual wavelength minimum interval 3nm, and the stabilized lasers of largest interval 80nm exports.Tuning range (80nm) is 1.6 times of the best result (dual wavelength interval tuning range 50nm) found at present.Overcome the non-all-fiber of existing 2 mu m waveband dual wavelength fibre laser, be subject to external environmental interference, tuning range is narrow, the feature that cost is higher.First, the tunable twin wavelength laser output of 2 mu m waveband can have application prospect comparatively widely in fields such as Microwave photonics and optical device detections.Secondly, the present invention adopts Sagnac ring and the cascade of multiple-mode interfence filter, and the composite filter obtained produces dual wavelength interval tunable laser and exports, and dual wavelength interval tuning range is large, and side mode suppression ratio is high.Finally, the present invention adopts all optical fibre structure, and loss is low, stable performance, is easy to integrated with fibre system.And cost is lower, there is higher cost performance.
Accompanying drawing explanation
Fig. 1 is prior art dual wavelength thulium-doped fiber laser schematic diagram.
Fig. 2 dual wavelength of the present invention interval is adjustable thulium-doped fiber laser structural representation.
Fig. 3 is that stress of the present invention is correlated with multiple-mode interfence filter construction schematic diagram.
Fig. 4-7 is dual wavelength interval of the present invention tunable optical spectrogram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 2, the 2 adjustable thulium-doped fiber lasers in mu m waveband dual wavelength interval, its by wavelength be the laser diode pumping source 13 of 1565nm, erbium-doped fiber amplifier 14,1560/2000nm wavelength division multiplexer 15 ("/" represents " with "), the 50:50 wide-band coupler 17 of single covering thulium doped fiber 16,2 mu m waveband, isolator 19,2 mu m waveband of stress relevant multiple-mode interfence filter 18,2 mu m waveband 90:10 wide-band coupler 20 to be formed by connecting loop laser resonance cavity.
Laser diode pumping source 13 connects with erbium-doped fiber amplifier 14, and pump power is set to 30dBm.The output of erbium-doped fiber amplifier 14 is held with a of wavelength division multiplexer 15 and is connected, and is injected in annular chamber by pump light.The c end of wavelength division multiplexer 15 is connected with thulium doped fiber 16 one end, produces 2 μm of gain signals therefrom.The other end of thulium doped fiber 16 is held with the d of 50:50 wide-band coupler 17 and is connected, the f end of 50:50 wide-band coupler 17 is connected with multiple-mode interfence filter 18 one end, the g end of 50:50 wide-band coupler 17 is connected with multiple-mode interfence filter 18 other end, thus make Sagnac ring and multiple-mode interfence filter 18 cascade, form compound filter structure, by realizing the control that dual wavelength interval 3nm-80nm exports to the torsion of multiple-mode interfence filter 18 in compound filter structure and pressing.The e end of 50:50 wide-band coupler 17 is connected with the input of isolator 19, thus ensure that the individual event running of light signal in resonant cavity.The output of isolator 19 is held with the k of 90:10 wide-band coupler 20 and is connected.The b end of wavelength division multiplexer 15 is held with the h of 90:10 wide-band coupler 20 and is connected, and the i end of 90:10 wide-band coupler 20 is 10% end, carries out Laser output, and h end is 90% end, provides light to feed back.Form ring cavity structure fiber laser thus, each device connection all adopts fused fiber splice.
As shown in Figure 3, the structure of multiple-mode interfence filter 18 is: multimode fiber 18-1 directly embeds in the V-type groove of optical fibre rotator 18-3, optical fiber locker 18-4 is arranged on optical fibre rotator 18-3 both sides and is locked by multimode fiber 18-1, rotary screw 18-2 is arranged on above optical fibre rotator 18-3 multimode fiber 18-1 stress application, and rotatable optical fibre rotator 18-3 carrys out distortion multimode fiber 18-1, change multimode fiber 18-1 effective length, thus change interference peak, realize tunable filtering;
As shown in figs. 4-7, when pump power is set to 30dBm, by torsion and the control of pressing realization to polarization state of multiple-mode interfence filter 18 in compound filter structure, thus realize the control to dual wavelength interval 3nm-80nm output.The i of 90:10 wide-band coupler 20 holds laser to adopt 2 mu m waveband fibre optic spectral analyzers and 2 mu m waveband light power meters to measure.
Claims (2)
1. the adjustable thulium-doped fiber laser in all-fiber 2 mu m waveband dual wavelength interval, it is characterized in that, this laser is made up of laser diode pumping source (13), fiber amplifier (14), wavelength division multiplexer (15), thulium doped fiber (16), 50:50 wide-band coupler (17), multiple-mode interfence filter (18), isolator (19) and 90:10 wide-band coupler (20), laser diode pumping source (13) connects with fiber amplifier (14), fiber amplifier (14) output is held with a of wavelength division multiplexer (15) and is connected, the c end of wavelength division multiplexer (15) is connected with thulium doped fiber (16) one end, thulium doped fiber (16) other end is held with the d of 50:50 wide-band coupler (17) and is connected, the f end of 50:50 wide-band coupler (17) is connected with multiple-mode interfence filter (18) one end, the g end of 50:50 wide-band coupler (17) is connected with multiple-mode interfence filter (18) other end, thus make Sagnac ring and multiple-mode interfence filter (18) cascade, form compound filter structure, the e end of 50:50 wide-band coupler (17) is connected with the input of isolator (19), the output of isolator (19) is held with the k of 90:10 wide-band coupler (20) and is connected, the b end of wavelength division multiplexer (15) holds with the h of 90:10 wide-band coupler (20) the looping chamber that is connected, and the i end of 90:10 wide-band coupler (20) carries out 2 μm of twin wavelength laser output.
2. the adjustable thulium-doped fiber laser in all-fiber 2 mu m waveband dual wavelength interval according to claim 1, is characterized in that: the first output i of described 90:10 wide-band coupler (20) is 10% output, and the second output h is 90% output.
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Cited By (7)
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| CN105866069A (en) * | 2016-04-20 | 2016-08-17 | 北京信息科技大学 | Gas composition test system based on tunable fiber laser |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN109103737A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
| CN109597090A (en) * | 2018-12-13 | 2019-04-09 | 武汉万集信息技术有限公司 | Multi-wavelength laser radar range unit and method |
| CN110212398A (en) * | 2019-06-05 | 2019-09-06 | 华南理工大学 | A kind of single frequency optical fiber laser of the wide tunable based on multimode interference effect |
| CN110459937A (en) * | 2018-05-08 | 2019-11-15 | 华为技术有限公司 | Laser |
| CN110907400A (en) * | 2019-05-28 | 2020-03-24 | 天津工业大学 | Gas detection device based on micro-channel polarization-maintaining optical fiber Sagnac interference structure |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866069B (en) * | 2016-04-20 | 2018-11-27 | 北京信息科技大学 | A kind of gas componant test macro based on tunable optical fiber laser |
| CN105866069A (en) * | 2016-04-20 | 2016-08-17 | 北京信息科技大学 | Gas composition test system based on tunable fiber laser |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN107248692B (en) * | 2017-05-19 | 2020-01-14 | 武汉理工大学 | Ultra-narrow linewidth wavelength-adjustable composite cavity optical fiber laser |
| CN110459937A (en) * | 2018-05-08 | 2019-11-15 | 华为技术有限公司 | Laser |
| CN110459937B (en) * | 2018-05-08 | 2021-03-23 | 华为技术有限公司 | Laser device |
| CN109103737A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
| CN109597090A (en) * | 2018-12-13 | 2019-04-09 | 武汉万集信息技术有限公司 | Multi-wavelength laser radar range unit and method |
| CN109597090B (en) * | 2018-12-13 | 2023-10-03 | 武汉万集信息技术有限公司 | Multi-wavelength laser radar ranging device and method |
| CN110907400A (en) * | 2019-05-28 | 2020-03-24 | 天津工业大学 | Gas detection device based on micro-channel polarization-maintaining optical fiber Sagnac interference structure |
| CN110212398A (en) * | 2019-06-05 | 2019-09-06 | 华南理工大学 | A kind of single frequency optical fiber laser of the wide tunable based on multimode interference effect |
| WO2020244130A1 (en) * | 2019-06-05 | 2020-12-10 | 华南理工大学 | Multimode interference effect-based widely tunable single-frequency fiber laser |
| US20220216666A1 (en) * | 2019-06-05 | 2022-07-07 | South China University Of Technology | Multimode interference effect-based wide tunable single-frequency optical fiber laser |
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