CN201985422U - L-band fiber laser with tunable wavelength - Google Patents
L-band fiber laser with tunable wavelength Download PDFInfo
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- CN201985422U CN201985422U CN2011200742291U CN201120074229U CN201985422U CN 201985422 U CN201985422 U CN 201985422U CN 2011200742291 U CN2011200742291 U CN 2011200742291U CN 201120074229 U CN201120074229 U CN 201120074229U CN 201985422 U CN201985422 U CN 201985422U
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Abstract
The utility model relates to an L-band fiber laser with a tunable wavelength based on a fiber grating filter with a mechanically sensitive growth cycle. Due to the adoption of a long-period fiber grating filter fabricated by a stress photoelastic effect in an annular cavity of the fiber laser, the designed laser has the advantages of wide tunning range, simple structure, narrow output laser linewidth, high reliability and the like. The L-band fiber laser with the tunable wavelength comprises a light source, wherein the light source is connected with the annular cavity of the fiber laser, a coupler is arranged in the annular cavity. The coupler outputs partial lasers and sends another part of lasers back to the fiber grating filter with the mechanically sensitive growth cycle serially connected in the annular cavity. The fiber grating filter with the mechanically sensitive growth cycle comprises a pressure tank template with a period of P, and the lower part of the fiber grating filter with the mechanically sensitive growth cycle corresponds to a pair of smooth base plates between which a long-period fiber to be fabricated and a balance fiber are arranged.
Description
Technical field
The utility model relates to a kind of Wavelength tunable laser, particularly, belong to optical fiber communication, sensory field of optic fibre based on the tunable wave length L-band fiber laser of mechanical inducted long period optical fiber grating filter.
Background technology
Fiber laser is one of research topic of forefront in the current information epoch technical research field, progress along with laser diode-pumped technology and fiber optic materials and technical study, various types of fiber lasers can be suitable for different application scenarios, its application also from optical-fibre communications field before promptly to other more wide fields such as laser application, Fibre Optical Sensor and optic fiber gyroscope expansion.
Tunable optical fiber laser is owing to available bandwidth broad, power height, line width, obtained to use widely with characteristics such as the natural compatibility of fiber optic component.Tunable optical fiber laser not only becomes the ideal signal carrier of high-speed high capacity dense wave division multipurpose optical fiber telecommunications system, and becomes sensing detection light source desirable in the optical fiber sensing system.Though tunable optical fiber laser has obtained widely to use at present, also exist many problems to remain further to be solved, particularly to the problems such as realization of the effective tuning and wavelength locking function of output wavelength.In numerous tunable technology methods, seeking the tuned filter that tuning range is wide, stability is high, accurate nothing is warbled and durability is good is the key that further improves fiber laser output wavelength tuning performance.Filter is a kind of wavelength selector spare, directly the quality of influence output laser.Tunable optic filter mainly contains fiber grating, fiber loop mirror, fiber F-P filter, Polarization Controller (chamber includes the polarization related device) etc. at present.The domestic fiber grating tuning scheme that adopts more, main because have natural compatibility between fiber grating and the optical fiber, the full fiber type tunable laser be can realize with it, and mechanical tuning scheme, thermal tuning and the electromagnetic force tuning of fiber grating proposed.Though wherein mechanical tuning, electromagnetic force tuning are simple, but by the restriction that is subjected to the emergent property of fiber grating own, be difficult to obtain big tuning range, in the tuning process of fiber grating reflection wavelength, obtaining bigger wavelength tuning range is the target that people pursue, but also to consider the degree of warbling of tuning process and the factors such as stability of centre wavelength, because they have determined the quality and stability of output laser.Present research mainly be by select different structure wait strain beam realize the wavelength tuning range of broad and tuning process accurate do not have warble, yet the creep of fiber grating, factor such as aging are restricted its application, especially ambient temperature is the emphasis problem that people endeavour to solve to the influence of wavelength tuning.Except that electromagnetic force tuning, thermal tuning, it is tuning to utilize methods such as pressure, sound wave, chemistry to carry out in addition, but these methods that all is that all right is ripe and tuning range is very little.
It is little that long period fiber grating has supplementary load loss, without male offspring to characteristics such as reflections, extensively is used as gainequalizer, and optical noise filter etc. are a kind of good mode transmission band stop filters.Therefore, it is sealed in the annular chamber,, adjust annular chamber gain peak, can realize the tunable wave length of erbium doped fiber laser by changing the resonance sideband position of LPFG.But be based on ultraviolet light or CO
2The LPFG equipment cost height of laser write system, and large-scale tuning need to introduce high temperature instrument or complicated stress structure.
The utility model content
Main purpose of the present utility model provides a kind of tunable wave length L-band fiber laser based on mechanical inducted long period optical fiber grating filter exactly for addressing the above problem.It is wide, simple in structure that the use of long period optical fiber grating filter in the fiber laser annular chamber that it utilizes the stress photoelastic effect to write system makes that the laser of design has tuning range, output laser rays width, stable advantages of higher.
For achieving the above object, the utility model adopts following technical scheme:
A kind of tunable wave length L-band fiber laser, it comprises light source, light source is connected with the annular chamber of fiber laser, is provided with coupler in annular chamber, and coupler output laser is sent another part laser back to the mechanical inducted long period optical fiber grating filter that is serially connected in annular chamber simultaneously; Described mechanical inducted long period optical fiber grating filter comprises that the cycle is the head tank template of P, and its below is corresponding with a pair of level and smooth base plate, is provided with system long period optical fiber to be written and balance optical fiber between two level and smooth base plates.
Also be provided with wavelength division multiplexer in the described annular chamber, its input is connected with light source, output is connected with fibre optic isolater, fibre optic isolater is connected successively with Er-doped fiber, coupler, mechanical inducted long period optical fiber grating filter, Polarization Controller, and Polarization Controller is connected with wavelength division multiplexer.
The free end of described coupler adopts the very small diameter coiling, and the coating optic fibre matching fluid.
Described Er-doped fiber adopts the Er-doped fiber of concentration 500ppm.
Described light source is the 980nm pump light source, and its centre wavelength is 975.650nm, and drive current is 120mA.
Described fibre optic isolater is 1550 fibre optic isolaters, and wavelength band is 1550
+40nm covers C and L-band.
The described cycle is that the duty ratio of the head tank template of P is 50%, precision＜5 μ m.
The utility model utilizes mechanical wires process technology fabrication cycle head tank, by spiral micrometric displacement structure compressing standard spring optical fiber is applied radial stress, writes and has made resonance wavelength, all tunable long period fiber grating of peak value.By adjusting the angle between system optical fiber to be written and the head tank, change the resonance wavelength of MLPFG, and then influence the gain peak in the laser ring cavity, realized the L-band tunable doped erbium optical fiber laser.
The utility model advantage compared with the prior art is:
(1) utilize long period optical fiber grating filter that the stress photoelastic effect writes system by the periodic pressure slot template that adopts the mechanical wires process technology the to make making of on system optical fiber to be written, exerting pressure, the resonance wavelength of long period optical fiber grating filter can be by changing the template cycle or changing system optical fiber to be written and head tank plate holder angle adjustment realization effective period, and the variation of long period optical fiber grating filter resonance wavelength and pressure frid are good linear relationship effective period, have simple in structure, the characteristics that wavelength tuning range is wide;
(2) when writing the system long period optical fiber grating filter, use balance optical fiber, make itself and the parallel placement of system optical fiber to be written, guarantee uniformity and stability when long period optical fiber grating filter is write system, be reduced in long period optical fiber grating filter and write the even polarization phenomena that causes of unbalanced stress in the system process, improve the quality of long period optical fiber grating filter, finally realize good laser output;
(3) the utility model utilizes the variation of long period optical fiber grating filter centre wavelength to regulate the interior gain peak of fiber laser annular chamber, and then realizes the change of output laser wavelength.This method has effectively suppressed the gain of fiber laser annular chamber long period optical fiber grating filter wave band of living in, and the high point of gain is appeared in the wave band that does not suppress.The influence that is not subjected to extraneous factor is adjusted in the ring cavity gain, has improved the continuity and the stability of fiber laser wavelength tuning;
(4) pumping 980 light sources of the utility model use detect and self-correcting function in real time with temperature control, power output, have guaranteed the power stability of fiber laser output;
(5) Polarization Controller in the utility model has reduced the dependence that long period optical fiber grating filter is write optical fiber polarisation attitude counter stress in the system process, by the adjustment of Polarization Controller, can realize the polarization characteristic that laser output is consistent;
(6) the utility model adopts the very small diameter coiling to 90: 10 coupler free ends, and the coating optic fibre matching fluid, has reduced free-ended light reflection, suppresses the incident of ambient light noise, improves the signal to noise ratio of fiber laser output.
Description of drawings:
Fig. 1 Wavelength tunable laser system diagram;
Fig. 1 a is mechanical inducted long period optical fiber grating filter structure chart;
Fig. 2 pumping source output spectra;
Angle adjustment between Fig. 3 system optical fiber to be written and the head tank;
Long period fiber grating transmission spectrum under Fig. 4 different cycles;
The relation of Fig. 5 template effective period and LPFG resonance wavelength;
Fig. 6 does not have the machinery laser output spectra under the long period optical fiber grating filter effect of inducting;
The different gratings of Fig. 7 fiber laser output spectra under effective period;
Fig. 8 laser resonance wavelength and the relation of grating between effective period.
Wherein, 1.980 pump lasers, 2.980/1550 wavelength division multiplexer, 3.1550 fibre optic isolater, 4. Er-doped fiber, 5. coupler, 6. mechanical inducted long period optical fiber grating filter, 7. head tank template, 8. level and smooth base plate, 9. Polarization Controller, 10. free end, 11. system optical fiber to be written, 12. balance optical fiber.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
The utility model tunable wave length L-band fiber laser its essence is by the resonance wavelength of mechanical inducted long period optical fiber grating filter and regulates, and changes the high point of gain in the fiber laser annular chamber, realizes the tunable of fiber laser output wavelength.
The Wavelength tunable laser system as shown in Figure 1.The light that 980 pump lasers 1 send enters the laser annular chamber behind 980/1550 wavelength division multiplexer 2, by 1550 fibre optic isolaters 3, inhibitory reflex light is to the influence of 980 pump lasers 1.By Er-doped fiber 4, Er-doped fiber 4 is the gain fibre in the annular chamber then, and the optical transition that 980 pump lasers 1 can be sent is to 1550 wave bands.Behind Er-doped fiber 4, enter 90: 10 couplers 5, this coupler inputs to most light in the laser annular chamber on the one hand, makes laser vibrate in annular chamber, and another part is exported as laser.The light that then enters in the annular chamber passes through mechanical inducted long period optical fiber grating filter 6, suppress the light intensity gain in mechanical inducted long period optical fiber grating filter 6 stopbands, acting as of Polarization Controller 9 reduces the dependence that mechanical inducted long period optical fiber grating filter 6 is write polarization state counter stress in the system process.The free end 10 of 90: 10 couplers is handled, and mainly is the noise that enters in the laser ring cavity in order to reduce.Through the repeatedly concussion of signal in the laser ring cavity, realize the stable output of laser of narrowband.Er-doped fiber 4 adopts the Er-doped fiber of high concentration 500ppm, and chooses suitable length, utilizes the side mode suppression ratio and the wave-length coverage of its gain characteristic control laser.980nm pump laser 1 centre wavelength is 975.650nm, and drive current is 120mA, and has Output optical power monitoring and temperature controlled function.The wavelength band of 1550 fibre optic isolaters 3 is 1550
+40nm covers C and L-band.
Among Fig. 1 b, mechanical inducted long period optical fiber grating filter 6 is that the system of writing structure employing mechanical sense that the head tank template 7 of P, level and smooth base plate 8, system optical fiber 11 to be written, balance optical fiber 12 are formed is thought of a way and write system by the cycle, the wavelength regulation of mechanical inducted long period optical fiber grating filter 6 is keeping under the certain pressure condition, can be 7 cycles of the head tank template realization of P by the change cycle.
Cycle is that the head tank template 7 of P adopts the mechanical wires processing method to write system, and by the cycle of Digit Control Machine Tool control processing frid, duty ratio is 50%, precision＜5 μ m.
Mechanical inducted long period optical fiber grating filter 6 is sealed in the fiber laser annular chamber, by regulating mechanical inducted long period optical fiber grating filter 6 resonance wavelengths, regulate and suppress wave band in the annular chamber, change ring cavity gain peak, realize Wavelength tunable laser.Mechanical inducted long period optical fiber grating filter 6 as band stop filter, utilizes its resonance wavelength tunability in the fiber laser ring cavity, realize the tuning of laser ring cavity gain peak.The wavelength regulation of mechanical inducted long period optical fiber grating filter 6 both can be passed through different head tank template of replacement cycle, also can be with the angle of writing between system optical fiber and the head tank template to realize by changing.In the system of the writing structure of mechanical inducted long period optical fiber grating filter 6, balance optical fiber 12 is the poised states that are used for keeping the optical fiber 11 of system long period fiber grating to be written, guarantees that the nothing when mechanical inducted long period optical fiber grating filter 6 is warbled and stability.
Be illustrated in figure 2 as the output spectrum figure of 980 pump lasers 1.The laser output source of fiber laser comes from the pump energy of pump laser 1, therefore the stability of 980 pump lasers 1 is the prerequisite of output laser power stability, 980 pump lasers 1 adopt the close-loop feedback control circuit, and are provided with power output detection and automatic temperature-adjusting controlled function.Angle adjustment schematic diagram between Fig. 3 system optical fiber 11 to be written and the head tank template 7, in the utility model, the resonance wavelength adjustment of mechanical inducted long period optical fiber grating filter 6 is to realize by the angle that changes between system optical fiber 11 to be written and the head tank template 7, can realize writing the continuous adjustment of 6 effective periods of system long period optical fiber grating filter so on the one hand, can reduce on the one hand in addition and write pallet quantity.Write the adjustment of pallet cycle the relation between the variation of long period optical fiber grating filter 6 resonance wavelengths depended on following principle:
In the long period fiber grating, in different resonance wavelength
mThe place, fibre core basic mode LP
01Be coupled with m rank fl transmission cladding mode.Coupled wavelength is decided by the fiber phase matching equation
Wherein
With
Be respectively at λ
mThe LP at place
01Mould and m cladding mode LP
0mEffective refractive index, Λ is the cycle of long period fiber grating.Therefore effective period Λ change, will inevitably cause long period optical fiber grating filter 6 resonance wavelength
mVariation.
Fig. 4, Fig. 5 are respectively difference and write the long period fiber grating transmission spectrum of pallet under the cycle and the relation of template effective period and LPFG resonance wavelength, the variation of mechanical inducted as can be seen long period optical fiber grating filter 6 resonance wavelengths has good linear relationship with writing the pallet cycle, and this has determined regularity and controllability that mechanical inducted long period optical fiber grating filter 6 resonance wavelengths are regulated.Fig. 6 does not have the machinery laser output spectra under the long period optical fiber grating filter effect of inducting, the condition that obtains this laser output spectra is the bandreject filtering effect of mechanical inducted long period optical fiber grating filter device 6 in the laser annular chamber, and its output laser wavelength depends on factors such as selected device parameters and chamber length.Fig. 7, Fig. 8 are respectively different gratings fiber laser output spectra and laser resonance wavelength and grating relation between effective period under effective period, as can be seen, under the bandreject filtering effect of mechanical inducted long period optical fiber grating filter 6, obtain the tunable output of laser, and found out the output laser wavelength and mechanical inducted long period optical fiber grating filter 6 is write the relation of molding version between effective period.
The utility model is by adjusting the angle between system optical fiber to be written and the periodic pressure groove, change the system of the writing cycle of long period optical fiber grating filter, tuning long period optical fiber grating filter transmission spectrum, and then influence annular chamber gain peak, fiber laser tunable wave length scope can reach 42nm (1562.465nm～1604.280nm), laser spectroscopy 3dR bandwidth is less than 0.02nm, and the 20dR bandwidth is all less than 0.06nm, and side mode suppression ratio is greater than 35dB.Long-time observation, laser power stability is better than 0.02dBm.The result shows that this fiber laser has easily tuning, and cost is low, broader bandwidth, characteristics such as line width and stable performance.
The content that is not described in detail in the utility model specification belongs to those skilled in the art's known technology.
Claims (7)
1. tunable wave length L-band fiber laser, it is characterized in that, it comprises light source, light source is connected with the annular chamber of fiber laser, be provided with coupler in annular chamber, coupler output laser is sent another part laser back to the mechanical inducted long period optical fiber grating filter that is serially connected in annular chamber simultaneously; Described mechanical inducted long period optical fiber grating filter comprises that the cycle is the head tank template of P, and its below is corresponding with a pair of level and smooth base plate, is provided with system long period optical fiber to be written and balance optical fiber between two level and smooth base plates.
2. tunable wave length L-band fiber laser as claimed in claim 1, it is characterized in that, also be provided with wavelength division multiplexer in the described annular chamber, its input is connected with light source, output is connected with fibre optic isolater, fibre optic isolater is connected successively with Er-doped fiber, coupler, mechanical inducted long period optical fiber grating filter, Polarization Controller, and Polarization Controller is connected with wavelength division multiplexer.
3. tunable wave length L-band fiber laser as claimed in claim 1 or 2 is characterized in that, the free end of described coupler adopts the very small diameter coiling, and the coating optic fibre matching fluid.
4. tunable wave length L-band fiber laser as claimed in claim 2 is characterized in that, described Er-doped fiber adopts the Er-doped fiber of concentration 500ppm.
5. tunable wave length L-band fiber laser as claimed in claim 2 is characterized in that described light source is the 980nm pump light source, and its centre wavelength is 975.650nm, and drive current is 120mA.
6. tunable wave length L-band fiber laser as claimed in claim 2 is characterized in that described fibre optic isolater is 1550 fibre optic isolaters, and wavelength band is 1550
+40nm covers C and L-band.
7. tunable wave length L-band fiber laser as claimed in claim 1 is characterized in that, the described cycle is that the duty ratio of the head tank template of P is 50%, precision＜5 μ m.
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| CN2011200742291U CN201985422U (en) | 2011-03-21 | 2011-03-21 | L-band fiber laser with tunable wavelength |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200742291U CN201985422U (en) | 2011-03-21 | 2011-03-21 | L-band fiber laser with tunable wavelength |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259169A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Difference frequency terahertz wave optical optical fiber laser |
| CN103259170A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Ultrasound induction long-periodic fiber bragg grating Q-switched pulse continuous dual-purpose optical fiber laser |
| CN103259168A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | All-fiber annular tunable fiber laser |
| CN103326219A (en) * | 2013-04-22 | 2013-09-25 | 西北大学 | Tunable small wavelength interval equipower dual-wavelength optical fiber laser |
-
2011
- 2011-03-21 CN CN2011200742291U patent/CN201985422U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259169A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Difference frequency terahertz wave optical optical fiber laser |
| CN103259170A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Ultrasound induction long-periodic fiber bragg grating Q-switched pulse continuous dual-purpose optical fiber laser |
| CN103259168A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | All-fiber annular tunable fiber laser |
| CN103326219A (en) * | 2013-04-22 | 2013-09-25 | 西北大学 | Tunable small wavelength interval equipower dual-wavelength optical fiber laser |
| CN103259169B (en) * | 2013-04-22 | 2015-03-25 | 西北大学 | Difference frequency terahertz wave optical fiber laser |
| CN103326219B (en) * | 2013-04-22 | 2015-10-28 | 西北大学 | Tunable small wavelength interval equipower dual-wavelength optical fiber laser |
| CN103259168B (en) * | 2013-04-22 | 2015-10-28 | 西北大学 | All-fiber annular tunable fiber laser |
| CN103259170B (en) * | 2013-04-22 | 2016-05-11 | 西北大学 | Supersonic induced LPFG Q impulse and continuous dual-purpose optical fiber laser |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20120321 |