CN100418276C - Distributed feedback light waveguide laser - Google Patents
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- CN100418276C CN100418276C CNB2004100427893A CN200410042789A CN100418276C CN 100418276 C CN100418276 C CN 100418276C CN B2004100427893 A CNB2004100427893 A CN B2004100427893A CN 200410042789 A CN200410042789 A CN 200410042789A CN 100418276 C CN100418276 C CN 100418276C
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Abstract
The present invention relates to a distributed feedback light waveguide laser which belongs to the technical field of an optical waveguide laser. The present invention is characterized in that a sampling period is in an abrupt transition in the area which is positioned within (+/-) 15% of the center of a sampling Bragg grating engraved on optical waveguide; other sampling periods are constant; the sampling period after the abrupt transition is from 1.4 to 1.6 or from 0.4 to 0.6 time than the prime period; the equivalent phase-shift sampling Bragg grating makes slit generated from all levels of respective reflection peaks of the grating similar to that of a common phase-shift grating; the grating period of the grating has a linear chirping. When the period after the abrupt transition is 1.5 or 0.5 time than the prime period, the used equivalent chirping technology compensates for a-1 level reflection peak of the equivalent phase-shift Bragg grating, which makes the chirping of the-1 level reflection peak approach to zero. Based on a DFB fiber laser of the equivalent phase-shift sampling optical fiber grating, the present invention has the advantages of simple grating manufacturing and high reliability, and the laser which is made according to the present invention has the advantages of good performance and stability.
Description
Technical field
The invention belongs to the photoelectron technology field, relevant with distributed feed-back formula optical waveguide laser, relate in particular to the design and fabrication of the DFB fiber laser of single longitudinal mode, single polarization.
Technical background
The kind of laser is a lot, but its manufacturing principle is basic identical, is made up of excitation system, laser material and optical resonator three parts mostly.Because the development of semiconductor laser technology and optical communication, the semiconductor pumped optical waveguide laser of mixing gain substance is because its good performance development in recent years is rapid.Optical waveguide laser mainly contains fiber laser and plane optical waveguide laser.(Distributed Feedback, DFB) optical waveguide laser is wherein very important a kind of to the distributed feed-back formula.The DFB optical waveguide laser has many good characteristics: narrow linewidth, high-output power accurately obtain necessary wavelength etc. easily.Special because progress, the ultraviolet light of optic fibre manufacture process write the increasingly mature of technology such as Fiber Bragg Grating FBG, the DFB fiber laser makes it have a wide range of applications in fields such as optical communication, sensing, spectroscopy owing to the characteristic of its stable single mode operation, super narrow live width, very long coherence length, short length, stable structure.
The grating of DFB optical waveguide laser is distributed in the whole resonant cavity, promptly write the phase shift Bragg grating on the active optical waveguide of gain substance containing, as long as a grating can be realized light feedback and wavelength selection, thereby makes it that better frequency stability be arranged, can realize stable single mode output.The structure of DFB optical waveguide laser is as shown in Figure 1: the 1-1 pump light source is generally semiconductor laser, the pump light that it produces is by 1-2 WDM (also being called coupler), enter into the active optical waveguide of 1-3 with phase-shifted grating, the signal laser of Chan Shenging just can be exported at 1-4 by WDM like this.The resonant cavity of high performance DFB optical waveguide laser is exactly the Bragg grating that writes band π phase shift in the middle of active optical waveguide.The reflectance spectrum of phase shift Bragg grating is seen accompanying drawing 2.The central wavelength of this structure can be proved by electromagnetic coupled mode theory, the sharp condition of penetrating of laser can be satisfied at grating.Present DFB optical waveguide laser comparative maturity aspect theoretical, but aspect making, because the making of phase-shifted grating more complicated comparatively speaking, and rate of finished products neither be very high, this just makes the suitable difficulty of making of high-quality DFB optical waveguide laser.
For the DFB optical waveguide laser, the quality of the gain of fiber waveguide and Bragg grating phase shift is very crucial, these two parameters have directly influenced the quality of DFB optical waveguide laser, and especially the quality of phase shift Bragg grating has determined the quality of DFB optical waveguide laser.The phase-shifting technique of realizing in optical waveguide laser at present has direct introducing phase shift [W.H.Loh and R.I.Laming, " 1.55um phase-shift distributed feedback fibre laser ", Electron.Lett., 1995,31 (17), pp.1440-1442], also have by after exposure and realize [J.Canning and M.G.Sceats in the intermediate regulations mean refractive index of grating, " π-phase-shifted periodic distributed structures in optical fibres by UV post-processing ", Electron.Lett., 1994,30 (16), pp.1344-1345].These phase-shifting techniques need very high control precision and manufacture craft, could realize high performance DFB optical waveguide laser.
On the other hand, people such as Feng Jia, Chen Xiangfei in 2002 Chinese invention patent " the Bragg grating that is used for compensation of dispersion and polarization mode disperse " with new sampling structure (application number: 02103383.8, publication number: proposed 1434583) by the sampling period of introducing the sampling Bragg grating the warble method of (CGP) of grating cycle that (CSP) obtain needed equivalence of warbling.The characteristics of this equivalent chirp technology are to use common even phase mask or linear chrip template and just can make the Bragg grating with needed equivalent chirp based on sub-micrometer precision, therefore can simplify the making of special Bragg grating greatly, have very big cost advantage and technical characteristic, can design grating easily with this, and not change template with different delay curve.Simultaneously, this technology can realize the equivalent chirped grating of various complexity on the submicron order precision that is easy to realize, and this equivalent chirped grating is the same with the complicated chirped grating role that has inferior nano-precision really.Equivalent chirp technology guarantees can separately to obtain as single order equivalent chirp, second order equivalence chirped grating, high-order equivalence chirped grating etc. fully.
Summary of the invention
The object of the present invention is to provide a kind of distributed feed-back formula optical waveguide laser based on the high equivalent phase shift sampling Bragg grating of the rate of finished products of using common even phase mask or linear chrip template and sub-micrometer precision to make.
The present invention proposes the notion of equivalent phase shift sampling Bragg grating, its concrete structure is: the sampling period of a certain position takes place to change suddenly in the sampling Bragg grating, and other sampling period remains unchanged, just can make the sampling Bragg grating some reflection peak reach the effect similar to phase-shifted grating.This and Bragg grating phase shift corresponding characteristic is called equivalent phase shift.Widely, if the sampling period of a plurality of positions of sampling Bragg grating takes place to change suddenly, some reflection peak of this sampling Bragg grating will produce the equivalent phase shift similar to the uniform grating that has these a plurality of phase shift point so.If particularly a sampling period at sampling Bragg grating center is changed into 1.5 times or 0.5 times of raw footage of its raw footage, and other sampling period remains unchanged, and just can make the odd level reflection peak of sampled-grating that equivalent π-phase shift takes place.Similar with equivalent chirp, this technology can realize the equivalent phase shift of various complexity on the submicron order precision that is easy to realize, and this equivalent grating phase shift is the same with the true phase shift role with nanometer, inferior nano-precision.In addition, the present invention also utilizes this special equivalent phase shift grating to produce the DFB fiber laser, its structure is seen accompanying drawing 3, the effect of each several part structure is consistent with Fig. 1, be that the pump light that the 3-1 pump light source produces passes through 3-2 WDM, enter into the active optical waveguide of 3-3 with the equivalent phase shift sampled-grating, the signal laser of Chan Shenging just can be exported at 3-4 by WDM like this.The equivalent phase shift sampling optical-fiber grating can avoid making the complicated technology of phase-shifted grating, make manufacture craft that extraordinary repeatability, stability be arranged, can obtain very high rate of finished products, thereby make cost of manufacture reduce greatly, the laser performance that uses it to produce is good, stable, and very big practical potentiality are arranged.
The sampling Bragg grating has a plurality of reflection peaks, and each reflection peak can be used as a channel light filter and uses in optical communication and other optoelectronic areas.According to Fourier analysis, the corresponding corresponding fourier series m of each reflection peak of sampling Bragg grating.The cycle of sampling Bragg grating is P, as shown in Figure 4, be designated as 4-1, if the sampling period of a certain position takes place to change suddenly in the sampling Bragg grating, become P+ Δ P, be designated as 4-2, the cycle of Δ P for increasing, in the channel of so corresponding m reflection peak, in this position the effect similar to phase shift takes place, its phase shift is
θ is the equivalent phase shift size in the m channel.Change into especially 1.5 times or 0.5 times of primitive period of its primitive period, promptly during Δ P=± 0.5P, equivalent grating phase shift takes place at the center of this grating when a sampling period of sampling Bragg grating center, big or small θ=± m π.This equivalent grating phase shift is the same with true phase shift role in the m channel, make the center of the odd level reflection peak 6-1 of corresponding odd number m produce the slit 6-2 similar to phase-shifted grating on reflectance spectrum, promptly this grating has the character similar to common phase-shifted grating in the certain wavelengths scope.The sampling period of sampled-grating generally all is the length of submillimeter magnitude, therefore when making, can guarantee very high precision, avoid making the complicated technology of phase-shifted grating, make manufacture craft that extraordinary repeatability, stability be arranged, can obtain very high rate of finished products, thereby make cost of manufacture reduce greatly.On the active optical waveguide of erbium-doped optical waveguide or various doped with rare-earth elements, write the sampled-grating of equivalent phase shift, fiber waveguide can be optical fiber or planar optical waveguide, the phase-shifted grating (also writing on the active optical waveguide) that uses this Bragg grating to substitute in the common DFB optical waveguide laser then just can be produced a kind of novel DFB optical waveguide laser, structure such as accompanying drawing 3.This DFB optical waveguide laser based on the equivalent phase shift sampled-grating, because the manufacturing process of grating is fairly simple, reliable, the laser performance that uses it to produce is good, stable, and very big practical potentiality are arranged.
Sampled-grating shown in the accompanying drawing 4, if get Δ P=± 0.5P, the reflectance spectrum of the equivalent phase shift sampling optical-fiber grating that obtains so is shown in accompanying drawing 5 (a), 5 (b).Its-1 (5-1) ,+reflectance spectrum of 1 odd level secondary peaks such as (5-2), have a very dark slit 5-3 at the center of reflection bandwidth, closely similar with the reflectance spectrum (accompanying drawing 2) of common phase-shifted grating, promptly the characteristic of flashlight in these zones of reflections is consistent with characteristic at true phase-shifted grating.This just characteristic consistent in correlation bandwidth has determined the sampled-grating of equivalent phase shift can make the DFB optical waveguide laser of equivalence.Fig. 5 (b) is the figure that-1 reflection peak amplifies among Fig. 5 (a), its reflection characteristic and the reflection characteristic basically identical that is caused by true phase shift shown in Figure 2.
For a certain reflection peak, if there is the phase shift that is approximately equal to π in heart position annex therein, effective loss gain enough little or fiber waveguide of this reflection peak is enough big simultaneously, total actual gain is greater than 0 in the channel of corresponding this reflection peak to make fiber waveguide, and so corresponding this channel can produce laser.Therefore for as shown in Figure 3 structure, can there be the laser of a plurality of wavelength to swash simultaneously in theory and penetrates.A little less than considering that sampling optical-fiber grating high order reflection peak relatively ,-1 of grating grade and place ,+1 grade of peak just might swash simultaneously to penetrate and send laser like this.Because grating shows tangible cladding mode loss (being also referred to as the shortwave loss) on the shortwave direction, therefore the reflection peak of the actual equivalent phase shift that uses is-1 grade of peak, makes optical fiber only send-restraint single longitudinal mode laser but under normal conditions.And the gain of normal light waveguide is not very big, like this because there is mode competition in laser, under actual conditions, only can produce the laser of single longitudinal mode usually-1 grade of spike strong point.For the DFB optical waveguide laser, the reflectivity of resonance wavelength both sides wavelength is strong more good more, therefore preferably adopts the template of warbling in specific design, making equivalent phase shift sampled-grating.This is because if adopted the template of warbling, in order to compensate-1 grade of reflection peak because template is warbled the warbling of grating cycle of introducing, just the grating cycle that must bring template by the sampling period that changes grating warbles and compensates, and this will make-1 grade of reflection peak of grating the strongest simultaneously, and other main reflection peaks are weakened greatly, thereby help the making of the high-quality DFB optical waveguide laser of non-mode competition.
Adopt the linear chrip template to carry out the design of equivalent phase shift sampled-grating, the chirp coefficient of establishing the linear chrip template is c, therefore requires the change sampling period to compensate warbling of template introducing, and its computing formula is as follows:
The ordinal number of the n representative sampling in the formula, Z
0The expression reference length, its general and sampling period order of magnitude, z
nThe position of representing each sampling period, the length Z of each sampling period
n=z
n-z
N-1, Λ
1The initial value of representing one 1 grades of reflection peak place grating cycles.Like this along with the change of n just can be in the hope of the sampling period length Z of a series of grating
n, adopt this a series of Z
nMake sampled-grating and just can compensate warbling of template introducing.If at this a series of Z
nChange into original 1.5 times for a certain of mid portion, promptly be equivalent to half sampling period of sampling period translation in the middle of the grating, so just can introduce phase shift in the odd level reflection, its reflectance spectrum is shown in accompanying drawing 6 (a), 6 (b).The grating that designs so just has the characteristic the same with common phase-shifted grating in the wave-length coverage of its-1 grade of reflection peak.
On the fiber waveguide that gain is arranged of erbium-doped optical waveguide or various doped with rare-earth elements, write the equivalent phase shift sampled-grating, use the phase shift Bragg grating (also writing on the active optical waveguide) in the alternative common DFB optical waveguide laser of this grating then, its concrete structure is so just produced a kind of novel DFB optical waveguide laser as shown in Figure 3.This based on equivalent phase shift sampled-grating DFB optical waveguide laser, because the manufacturing process of Bragg grating is fairly simple, reliable, the laser performance that uses it to produce is good, stable, and very big practical potentiality are arranged.
Here need to prove that usually the fiber waveguide based on the DFB optical waveguide laser of Fig. 1 structure is the doped with rare-earth elements monomode fiber, claim also that therefore active optical waveguide is that this type of laser of optical fiber is the DFB fiber laser.On the other hand, active optical waveguide also can be a planar optical waveguide, and active optical waveguide is that the Distributed Feedback Laser of planar optical waveguide is called DFB planar optical waveguide laser.At present, Distributed Feedback Laser as Fig. 1 structure mostly is the DFB fiber laser greatly, DFB planar optical waveguide laser development in recent years also relatively rapidly, similar [the J.Albert etc. " Polarisation-independent strong Bragg gratings in planar lightwave circuits " of the technology that on the technology of writing Bragg grating on the planar optical waveguide coexists optical fiber, writes, Electronics Letters, 1998,34 (5), pp.485-486].Following example is a gain fibre with used active optical waveguide, but the corresponding techniques feature is applicable to the gain planar optical waveguide fully.
The invention is characterized in that it contains:
One section fiber waveguide that is mixed with the rare earth gain substance;
Be engraved in the equivalent phase shift Bragg grating on the described fiber waveguide, from this grating center ± 15% zone in, it is to take place to change suddenly that a sampling period is arranged, the cycle after the variation is 1.4 to 1.6 times of primitive period, and that other sampling period keeps is constant;
Swash the pump light source of penetrating above-mentioned distributed feed-back formula optical waveguide laser.
The grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 reflection peak.
The above-mentioned cycle of described equivalent phase shift Bragg grating changes the center that occurs in this grating suddenly.
On described equivalent phase shift Bragg grating, the sampling period behind the described flip-flop is 1.5 times of its primitive period, and the maintenance of other sampling period is constant.
On described equivalent phase shift Bragg grating, the cycle changes suddenly the center that occurs in this grating, and the sampling period after the sudden change be 1.5 times of its primitive period, and that other sampling period keeps is constant.
The grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the warbling of-1 grade of reflection peak of equivalent chirp technology compensation equivalent phase shift Bragg grating.And on described equivalent phase shift Bragg grating, the cycle changes suddenly the center that occurs in this grating, and the sampling period after the sudden change be 1.5 times of its primitive period, and that other sampling period keeps is constant.
Described rare earth gain substance is any in following erbium, ytterbium, neodymium, praseodymium and the erbium and ytterbium codoping material.
Described fiber waveguide is a monomode fiber.
Feature of the present invention is that also it contains:
One section fiber waveguide that is mixed with the rare earth gain substance;
Be engraved in the equivalent phase shift Bragg grating on the described fiber waveguide, from this grating center ± 15% zone in, it is to take place to change suddenly that a sampling period is arranged, and the sampling period after the variation is 0.4 to 0.6 times of former sampling period, and the maintenance of other sampling period is constant;
Swash the pump light source of penetrating above-mentioned distributed feed-back formula optical waveguide laser.
The grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 reflection peak.
The above-mentioned cycle of described equivalent phase shift Bragg grating changes the center that occurs in this grating suddenly.
On described equivalent phase shift Bragg grating, the sampling period behind the described flip-flop is 0.5 times of its primitive period, and the maintenance of other sampling period is constant.
On described equivalent phase shift Bragg grating, the cycle changes suddenly the center that occurs in this grating, and the sampling period after the sudden change be 0.5 times of its primitive period, and that other sampling period keeps is constant.
The grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the warbling of-1 grade of reflection peak of equivalent chirp technology compensation equivalent phase shift Bragg grating.And on described equivalent phase shift Bragg grating, the cycle changes suddenly the center that occurs in this grating, and the sampling period after the sudden change be 0.5 times of its primitive period, and that other sampling period keeps is constant.
Described rare earth gain substance is any in following erbium, ytterbium, neodymium, praseodymium and the erbium and ytterbium codoping material.
Described fiber waveguide is a monomode fiber.
Evidence: compare with the laser that present other universal method makes, the present invention can design high-quality equivalent phase shift sampling optical-fiber grating, the manufacturing process of grating is also fairly simple, reliable, use equivalent DFB fiber laser function admirable that it produces, stable, power output is bigger, side mode suppression ratio is very high, and live width is very narrow.In sum, what the present invention had all has very big advantage technically with on the manufacture craft, and therefore very big practical potentiality are arranged.
Description of drawings
Fig. 1 DFB optical waveguide laser structural representation.1-1 pump light source wherein, 1-2 WDM, 1-3 be with the active optical waveguide of phase-shifted grating, the output of 1-4 laser.
The reflectance spectrum of Fig. 2 phase shift Bragg grating.
Fig. 3 is of the present invention based on equivalent phase shift sampling Bragg grating DFB Bragg laser structural representation.Wherein: the 3-1 pump light source, 3-2 WDM, 3-3 are with the active optical waveguide of equivalent phase shift sampled-grating, and 3-4 laser is exported.
Fig. 4 is the structural representation of the equivalent phase shift sampling Bragg grating of the present invention's proposition
Fig. 5 for the equivalent phase shift Bragg grating that uses even template construct 0, ± 1 grade of peak reflectance spectrum (a) and-1 grade of peak reflectance spectrum (b).
Fig. 6 for the equivalent phase shift Bragg grating that uses the linear chrip template construct 0, ± 1 grade of peak reflectance spectrum (a) and-1 grade of peak reflectance spectrum (b).
Fig. 7 makes the device schematic diagram of Fiber Bragg Grating FBG for the present invention.
Fig. 8 is the actual measurement reflectance spectrum of the equivalent phase shift sampling Fiber Bragg Grating FBG of the present invention's making.
Fig. 9 is the sharp spectrum of penetrating of the DFB fiber laser of the present invention's making.
Embodiment
The manufacture method that the present invention is based on the DFB fiber laser of equivalent phase shift sampling optical-fiber grating is divided into the two large divisions: the one, and the design and fabrication of equivalent phase shift sampling optical-fiber grating, the 2nd, the making of DFB fiber laser.Concrete embodiment is described with reference to the accompanying drawings as follows:
One, the design and fabrication of equivalent phase shift sampling optical-fiber grating
This experiment adopts the template of warbling to make, and according to document, compensate-1 grade of peak because the warbling of the grating cycle that template is introduced, and the grating cycle that will bring template by the sampling period that changes grating warbles and compensates, and specifically is to adopt formula
Calculate the length of each sampling period successively.Here Z
0=0.5mm, c=0.048nm/mm, Λ
1=1543.8nm, n=1,2,3 ... 280.Try to achieve the position z of each sampling period successively along with the change of n
n, calculate the sampling period length Z of grating again
n, make Z then
140=1.5Z
140, and other sampling period remains unchanged.
The device of present embodiment preparing grating as shown in Figure 7.Wherein, light source adopts continuous 244nm frequency multiplication argon ion laser 71 (production of U.S. coherent company).Scanning reflection mirror 72 is fixed on the PI scanning mobile platform (German PI company produce) 73, and scanning mobile platform kinematic accuracy is 0.1um.Speculum 72 has the function of scanner uni folded light beam, and the ultraviolet light that laser 71 is exported reflexes on the linear chrip phase mask 74, this phase mask length is 120mm, and ultraviolet light is radiated at carrying on the Er-doped fiber 75 of processing through hydrogen under it through phase mask.PI scanning mobile platform links to each other with the serial port (not shown) of microcomputer.By the drive software that operation on microcomputer designs in advance, change the motion state (run duration, move distance) of mobile platform, it is moved according to a certain characteristics of motion, just can obtain the fiber grating that needs.
Length Z according to each sampling period of trying to achieve above
1, Z
2, Z
3Z
280, on Er-doped fiber, make sampled-grating, concrete step is as follows:
(1) one section long Er-doped fiber of 15cm is carried hydrogen and handle and peel off one section coat;
(2) above-mentioned optical fiber is fixed on the linear chrip template that chirp coefficient is c after, make it;
(3) adjust the luminous power that laser is output as 50mw;
(4) adjust light path, the hot spot through the scanning reflection mirroring is radiated on the fibre core of optical fiber;
(5) open the translation stage Control Software of microcomputer, import the length Z of each sampling period
nWith every time for exposure;
(6) start scanning platform, make it move to the original position of grating exposure;
(7) under the control of translation stage Control Software, finish the making of grating;
Make the equivalent phase shift sampling optical-fiber grating of designing requirement of the present invention according to above step, use spectrometer to record its reflectance spectrum as shown in Figure 8, the wavelength at-1 grade of peak is 1543.8nm, + 1 ,-3 all there is tangible pit in the center at grade peak, 0 ,-2 a grade peak does not then exist, and this analysis in advance with design is consistent.Simultaneously, because the grating cycle at place ,-1 grade of peak warbles and has obtained compensation, so its bandwidth is the narrowest, and reflectivity is the highest, as for phase shift that can't see the center is that spectrometer can't be differentiated (resolution of spectrum has only 0.01nm) because slit is narrow especially.
Two, based on the DFB fiber laser of equivalent phase shift sampling optical-fiber grating
According to accompanying drawing 3 structure fabrication DFB fiber lasers.The pump laser that uses is that power is 160mW, and wavelength is the semiconductor laser of 980nm, and pump light enters into the equivalent phase shift sampling optical-fiber grating of making above by behind the coupler (WDM).Obtain laser output at the coupler other end like this, its power is about 0.20mW, resonance wavelength is 1543.8nm, and side mode suppression ratio is 67dB, sees accompanying drawing 9.
Claims (16)
1. distributed feed-back formula optical waveguide laser is characterized in that, it contains:
One section fiber waveguide that is mixed with the rare earth gain substance;
Be engraved in the equivalent phase shift Bragg grating on the described fiber waveguide, and, from this grating center ± 15% zone in, it is to take place to change suddenly that a sampling period is arranged, sampling period after the variation is 1.4 to 1.6 times of former sampling period, and the maintenance of other sampling period is constant;
Excite the pump light source of above-mentioned distributed feed-back formula optical waveguide laser.
2. distributed feed-back formula optical waveguide laser according to claim 1 is characterized in that: the above-mentioned sampling period of described equivalent phase shift Bragg grating changes the center that occurs in this grating suddenly.
3. distributed feed-back formula optical waveguide laser according to claim 1 is characterized in that: on described equivalent phase shift Bragg grating, the sampling period after the described unexpected variation is 1.5 times of this former sampling period, and the maintenance of other sampling period is constant.
4. distributed feed-back formula optical waveguide laser according to claim 2 is characterized in that: on described equivalent phase shift Bragg grating, the sampling period after the described unexpected variation is 1.5 times of this former sampling period, and the maintenance of other sampling period is constant.
5. distributed feed-back formula optical waveguide laser according to claim 1, it is characterized in that: the grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 reflection peak.
6. distributed feed-back formula optical waveguide laser according to claim 4, it is characterized in that: the grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 grade of reflection peak.
7. distributed feed-back formula optical waveguide laser according to claim 1 is characterized in that: described rare earth gain substance is any in following erbium, ytterbium, neodymium, praseodymium and the erbium and ytterbium codoping material.
8. according to the described distributed feed-back formula of any one claim optical waveguide laser in the claim 1,4,6, it is characterized in that: described fiber waveguide is a monomode fiber.
9. distributed feed-back formula optical waveguide laser is characterized in that, it contains:
One section fiber waveguide that is mixed with the rare earth gain substance;
Be engraved in the equivalent phase shift Bragg grating on the described fiber waveguide, from this grating center ± 15% zone in, it is to take place to change suddenly that a sampling period is arranged, and the sampling period after the variation is 0.4 to 0.6 times of former sampling period, and the maintenance of other sampling period is constant;
Swash the pump light source of penetrating above-mentioned distributed feed-back formula optical waveguide laser.
10. distributed feed-back formula optical waveguide laser according to claim 9 is characterized in that: the above-mentioned sampling period of described equivalent phase shift Bragg grating changes the center that occurs in this grating suddenly.
11. distributed feed-back formula optical waveguide laser according to claim 9 is characterized in that: on described equivalent phase shift Bragg grating, the sampling period after the described unexpected variation is 0.5 times of this former sampling period, and the maintenance of other sampling period is constant.
12. distributed feed-back formula optical waveguide laser according to claim 10 is characterized in that: on described equivalent phase shift Bragg grating, the sampling period after the described unexpected variation is 0.5 times of this former sampling period, and the maintenance of other sampling period is constant.
13. distributed feed-back formula optical waveguide laser according to claim 9, it is characterized in that: the grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 reflection peak.
14. distributed feed-back formula optical waveguide laser according to claim 12, it is characterized in that: the grating cycle of described equivalent phase shift Bragg grating has linear chrip, uses the Fourier ordinal number of equivalent chirp technology compensation equivalent phase shift Bragg grating to equal warbling of-1 reflection peak.
15. distributed feed-back formula optical waveguide laser according to claim 9 is characterized in that: described rare earth gain substance is any in following erbium, ytterbium, neodymium, praseodymium and the erbium and ytterbium codoping material.
16. according to the described distributed feed-back formula of any one claim optical waveguide laser in the claim 9,12,14, it is characterized in that: described fiber waveguide is a monomode fiber.
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| CN101826697B (en) * | 2010-05-26 | 2011-09-14 | 华中科技大学 | Method for manufacturing distributed Bragg reflection optical fiber laser |
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| CN113131325B (en) * | 2021-04-16 | 2022-07-01 | 山东省科学院激光研究所 | Active Q-switching distributed feedback fiber laser |
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| CN1410785A (en) * | 2002-10-11 | 2003-04-16 | 东南大学 | Manufacturing method of apodization Bragg optical fibre grating having no selfcausing twitter effect |
| CN1428960A (en) * | 2001-12-23 | 2003-07-09 | 华为技术有限公司 | On-line dispersion compensation device of wavelength division high-speed optical transmission system |
| CN1434583A (en) * | 2002-01-25 | 2003-08-06 | 清华大学 | Bragg grating with new sampling structure for compensating dispersion and polarization mode dispersion |
| US20030161581A1 (en) * | 2002-02-27 | 2003-08-28 | Akihiko Nishiki | Method and apparatus for generating carrier suppressed optical pulse train and grating device |
| CN1458539A (en) * | 2002-05-17 | 2003-11-26 | 清华大学 | Variable duty cycle sampling optical fiber grating and its apodization |
| US6665472B2 (en) * | 2000-12-01 | 2003-12-16 | Sumitomo Electric Industries, Ltd. | Optical filter having cascaded long-period gratings |
-
2004
- 2004-05-28 CN CNB2004100427893A patent/CN100418276C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11174245A (en) * | 1997-08-12 | 1999-07-02 | Photonics Res Ontario | Optical waveguide filter and production thereof |
| US6665472B2 (en) * | 2000-12-01 | 2003-12-16 | Sumitomo Electric Industries, Ltd. | Optical filter having cascaded long-period gratings |
| CN1428960A (en) * | 2001-12-23 | 2003-07-09 | 华为技术有限公司 | On-line dispersion compensation device of wavelength division high-speed optical transmission system |
| CN1434583A (en) * | 2002-01-25 | 2003-08-06 | 清华大学 | Bragg grating with new sampling structure for compensating dispersion and polarization mode dispersion |
| US20030161581A1 (en) * | 2002-02-27 | 2003-08-28 | Akihiko Nishiki | Method and apparatus for generating carrier suppressed optical pulse train and grating device |
| CN1458539A (en) * | 2002-05-17 | 2003-11-26 | 清华大学 | Variable duty cycle sampling optical fiber grating and its apodization |
| CN1410785A (en) * | 2002-10-11 | 2003-04-16 | 东南大学 | Manufacturing method of apodization Bragg optical fibre grating having no selfcausing twitter effect |
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| CN1585213A (en) | 2005-02-23 |
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