CN100514772C - Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser - Google Patents
Novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser Download PDFInfo
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- CN100514772C CN100514772C CNB2007103038180A CN200710303818A CN100514772C CN 100514772 C CN100514772 C CN 100514772C CN B2007103038180 A CNB2007103038180 A CN B2007103038180A CN 200710303818 A CN200710303818 A CN 200710303818A CN 100514772 C CN100514772 C CN 100514772C
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Abstract
The present invention discloses a novel single-polarization multi-wavelength polarization-maintaining sampled fiber grating laser. A polarization-maintaining sampled fiber grating laser (10) is switched into a 1xN coupler transverse-line arm (50); a first segment of active fiber (21) to an Nth segment of active fiber (2N) are respectively connected to a first bifurcation arm (51) to an Nth bifurcation arm (5N) of a coupler, wherein N is continuous natural number starting from 1; a first broadband fiber grating (11) to an Nth broadband fiber grating (1N) are respectively switched into one end of the first segment of active fiber (21) to the Nth segment of active fiber (2N); on the coupler transverse-line arm and behind the broadband fiber gratings, a pump coupler is used to couple pump light (30) or/and first to Nth pump light into the active fiber; arbitrary N reflection peaks of the polarization-maintaining sampled fiber grating and the first broadband fiber grating (11) to the Nth broadband fiber grating (1N) respectively form the laser resonant cavities with different wavelengths; single-polarization N-wavelength laser is output at a coupler transverse-line end (40).
Description
Technical field
The present invention relates to a kind of fiber laser, be applicable to optical fiber communication, microwave photon, technical field of optical fiber sensing.
Background technology
Adopt phase place sampling or intensive sampling, add a bulk strength mask or phase mask method making sampling optical-fiber grating every one section exposure with a phase place sampling mask or phase mask.The ordinary optic fibre grating has only a reflection peak, and sampling optical-fiber grating has the individual reflection peak of N (N 〉=2) " Shen Kuangyi " based on the wideband WDM channel model design of superstructure fiber grating " BeiJing, China university of communications master thesis 2006 ".Because the effective refractive index difference of polarization maintaining optical fibre fast and slow axis, 2 independently polarization states are arranged, the non-sampling grating of making on polarization maintaining optical fibre has 2 reflection peaks, and these 2 reflection peak correspondences independently 2 polarization states " peaceful outline etc. " are utilized grating research polarization maintaining optical fibre temperature characterisitic " Chinese laser 33 (8) 2006p.1078～1080 "; Make sampled-grating on polarization maintaining optical fibre, under the situation identical with Writing condition on the ordinary optic fibre, polarization-preserving sampling optical fiber optical grating has the individual reflection peak of 2N (N 〉=2), and this 2N reflection peak all is single polarization.
Fiber laser is a kind of up-and-coming light source in optical fiber communication, microwave photon, Fibre Optical Sensor and the laser system, its advantage is mainly reflected in: difficult WDM (wavelength division multiplexing) standard of wavelength that meets the ITU-T suggestion of the wavelength of (1) semiconductor laser, and cost is very high, and rare-earth doped optical fibre laser utilizes fiber grating etc. can determine wavelength very exactly, and cost is very low.(2) as the rare-earth doped optical fibre manufacture craft comparative maturity of gain, rare earth ion doped process is simple, and fibre loss is little.(3) adopt the high pumping of dexterous compact efficient to become possibility.(4) optical-fiber laser has the waveguide type optical fiber structure, can produce higher power density at fiber core layer.Optical fiber structure has higher area-volume ratio, thereby radiating effect is better.Compatible good with standard traffic optical fiber can be adopted multiple optical fiber components such as fiber grating, coupler, reduces the demand of block optical element and the trouble of light path mechanical adjustment, greatly simplifies the design and the making of optical-fiber laser.(5) broadband is one of main development trend of optical fiber communication, and optical-fiber laser can be realized laser output by mixing different rare earth ions in the broadband range of 380～3900nm, and it is easy and tunable that wavelength is selected.(6) little, the anti-electromagnetic interference of the frequency chirp effect under the high frequency modulated, temperature expansion coefficient are little etc. than semiconductor laser.
And common non-polarization maintaining optical fibre, because manufacturing process causes core cross sections that certain ovality is arranged, or, cause the anisotropy of optical fibre refractivity because optical fiber component material coefficient of thermal expansion coefficient inhomogeneities causes anisotropic stress or applied stress on the optical fiber cross section easily.In a word, when the symmetry in optical fiber cross section is destroyed, can produce between the orthogonal polarization modes of two different transmissions that formed by birefringence and intercouple, because the transmission of two polarization modes differs very little, thereby Mode Coupling is very strong.The birefringence that optical fiber structure itself exists and the effect of outer bound pair optical fiber all are at random, thereby the coupling between the polarization mode is at random, therefore generally speaking, the laser of fiber laser output is the polarization confusion, can't reach the degree of polarization of semiconductor laser output laser, perhaps the random polarization coupling causes the wavelength instability; Such laser output all can't be used under many circumstances.Existing multi-wavelength optical fiber laser is because mode competition is difficult to realize stable simultaneously sharp the penetrating of multi-wavelength under the normal temperature.If realization multi-wavelength optical fiber laser, the Active Optical Fiber that needs is inclined to one side for protecting, coupler also will be protected inclined to one side, and add the output that Polarization Control, Polarization Detection guarantee multi-wavelength optical fiber laser, perhaps need in the liquid nitrogen of ultralow temperature, eliminate mode competition, produce multi-wavelength, reliability is low, the cost height, control is complicated, is difficult to practicality.
Summary of the invention
Purpose of the present invention just provides a kind of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser, and it can overcome the deficiency of existing multi-wavelength optical fiber laser, not needing to realize the single-polarization multi-wavelength fiber laser of Polarization Control.
Technical scheme of the present invention:
A kind of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser constitutes the connection between the parts of this laser:
1) on the in-line arm of 1 * N coupler, inserts polarization-preserving sampling optical fiber optical grating;
2) first section Active Optical Fiber, second section Active Optical Fiber ..., N section Active Optical Fiber be connected respectively to first fen yoke of coupler, second fen yoke ..., N divides on the yoke; N is the consecution natural number from 1;
3) first section Active Optical Fiber, second section Active Optical Fiber ... N section Active Optical Fiber away from the coupler end, insert respectively the first band optical fiber grating, the second band optical fiber grating ... N band optical fiber grating;
4) utilize pumping coupler the pump light on the in-line arm or/and be connected the first band optical fiber grating, the second band optical fiber grating ..., first pump light of N band optical fiber grating back, second pump light ..., the N pump light is coupled into Active Optical Fiber;
5) any N reflection peak of polarization-preserving sampling optical fiber optical grating respectively with the first band optical fiber grating, the second band optical fiber grating ..., N band optical fiber grating forms the different wavelength of laser resonant cavity, produce laser, export single polarization N wavelength laser at a word end of coupler.
Active Optical Fiber or for protecting inclined to one side Active Optical Fiber is all selected er-doped for use or is mixed ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
Select some peaks of band optical fiber grating alignment polarization-preserving sampling optical fiber optical grating reflection peak arbitrarily, therefore the wavelength interval of the single polarization laser that produces is equally spaced, or unequal-interval.The number of wavelengths of output can be selected as required.
Beneficial effect of the present invention is specific as follows:
The Active Optical Fiber that existing multi-wavelength optical fiber laser needs is inclined to one side for protecting, coupler also will be protected inclined to one side, and add the output that Polarization Control, Polarization Detection guarantee multi-wavelength optical fiber laser, perhaps need in the liquid nitrogen of ultralow temperature, eliminate mode competition, produce multi-wavelength, reliability is low, the cost height, control is complicated, is difficult to practicality.
And the present invention adopts than protecting the much lower common Active Optical Fiber of inclined to one side Active Optical Fiber price as gain media, only needs a polarization-preserving sampling optical fiber optical grating, guarantees that each chamber resonance is on a polarization state.The laserresonator of each polarization state is independently, can eliminate conventional active polarization maintaining optical fibre and produce the problem of multi-wavelength mode competition, the stochastic model coupling can not appear, cause the change at random of wavelength or polarization state, do not need Polarization Control, in order to obtain better laser quality, the present invention also can adopt Polarization Control to control polarization state.Because an end of fiber laser resonant cavity has adopted the band optical fiber grating, make it easier to quasi-resonance with the reflection peak of arrowband polarization-preserving sampling optical fiber optical grating, reduced requirement to grating, than the easier realization of common multiple-wavelength laser, export more stable single-polarization laser, have higher cost performance.The present invention has reduced the coherence request to Active Optical Fiber, makes the inconsistent substantial influence that can not cause the single polarization dual-wavelength laser of characteristics such as Active Optical Fiber length.The present invention can choose the different reflection peak of polarization-preserving sampling optical fiber optical grating and constitute resonant cavity, produces single polarization laser, and therefore the wavelength and the wavelength interval of multiwavelength laser of the present invention can be selected as required.The present invention also can adopt existing Active Optical Fiber inclined to one side for protecting, and it is inclined to one side that coupler also will be protected, and the mode that will add Polarization Control, Polarization Detection realizes, but can reduce the requirement to device itself.The present invention also has little, all optical fibre structure affected by environment, compact conformation, characteristics such as easy to implement.
The chamber of the laser resonance of each polarization state of the present invention is independently, and each laser that divides yoke to produce can not be coupled mutually, can not form the polarization state change at random and have only some wavelength output or the problem of several at random wavelength output, does not need Polarization Control; Improve the laser quality if desired more, also can add isolator and polarized controller.Because an end of fiber laser resonant cavity has adopted the band optical fiber grating, makes it easier to quasi-resonance with the reflection peak of arrowband polarization maintaining optical fibre, has reduced the requirement to grating.Realize the laser output under the single-polarization multi-wavelength normal temperature first.
Description of drawings
Fig. 1 is a novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser schematic diagram.
The polarization-preserving sampling optical fiber optical grating schematic diagram that Fig. 2 adopts for the novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser.
Fig. 3 is a N=3 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser schematic diagram.
Fig. 4 is the polarization-preserving sampling optical fiber optical grating schematic diagram that N=3 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser adopts.
Fig. 5 is a N=8 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser schematic diagram.
Fig. 6 is the polarization-preserving sampling optical fiber optical grating schematic diagram that N=8 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser adopts.
Fig. 7 is a N=16 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser schematic diagram.
Fig. 8 is the polarization-preserving sampling optical fiber optical grating schematic diagram that N=16 novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser adopts.
Embodiment
Below in conjunction with drawings and Examples novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser of the present invention is further described.
Embodiment one
Constitute the connection between the parts of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser, as Fig. 3 and Fig. 4:
1. select one 1 * 3 coupler, at the in-line arm 50 access polarization-preserving sampling optical fiber optical gratings 10 of coupler.
2. select suitable length 3 sections: first section er-doped Active Optical Fiber 21, second section er-doped Active Optical Fiber 22 and the 3rd section er-doped Active Optical Fiber 23 are connected respectively to above three sections er-doped Active Optical Fibers on first fen yoke 51 of coupler, second fen yoke 52 and the 3rd fen yoke 53.
3. insert the first band optical fiber grating 11, the second band optical fiber grating 12 and the 3rd band optical fiber grating 13 at first section er-doped Active Optical Fiber 21, second section er-doped Active Optical Fiber 22 and the 3rd section er-doped Active Optical Fiber 23 respectively away from the coupler end, first, second, third band optical fiber grating 11,12 and 13 reflectance spectrum are spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-preserving sampling optical fiber optical grating of lap correspondence hangs down 1dB at least.
4. utilize pumping coupler that the pump light on the in-line arm 30 is coupled in the er-doped Active Optical Fiber.
5. three of polarization-preserving sampling optical fiber optical grating 10 reflection peaks form the different wavelength of laser resonant cavity with first, second, third band optical fiber grating 11,12 and 13 respectively, produce laser, at the single polarization three-wavelength laser of a word end 40 outputs of coupler.
6. the minimum length of the er-doped Active Optical Fiber of described selection suitable length is 1cm, and maximum length is by the decisions such as loss of coupler in pumping light power, absorption coefficient, the laser cavity.The er-doped Active Optical Fiber maximum length that is each chamber is exactly:
Under 30 effects of given pump light, first section chamber that er-doped Active Optical Fiber 21, the first band optical fiber grating 11, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute, can just encourage generation laser, the length of er-doped this moment Active Optical Fiber is exactly the maximum length in first chamber;
Under 30 effects of given pump light, second section chamber that er-doped Active Optical Fiber 22, the second band optical fiber grating 12, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute, can just encourage generation laser, the length of er-doped this moment Active Optical Fiber is exactly the maximum length in second chamber;
Under 30 effects of given pump light, the 3rd section chamber that er-doped Active Optical Fiber 23, the 3rd band optical fiber grating 13, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute, can just encourage generation laser, the length of er-doped this moment Active Optical Fiber is exactly the maximum length in the 3rd chamber;
When producing three wavelength lasers, only need from polarization-preserving sampling optical fiber optical grating, select three single reflection of polarization peaks, as choose three single reflection of polarization peak 101A of polarization-preserving sampling optical fiber optical grating, 101B, 102A, promptly in this case, N=3.101A is single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating among Fig. 4, and 101B is the single reflection of polarization of the another one peak of polarization-preserving sampling optical fiber optical grating, and 102A is the 3rd single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating; 111 is the reflection peak of the first band optical fiber grating 11, and 121 is the reflection peak of the second band optical fiber grating 12, and 131 is the reflection peak of the 3rd band optical fiber grating 13.
The reflection peak 101A of polarization-preserving sampling optical fiber optical grating and the first band optical fiber optical grating reflection peak 111, first section er-doped Active Optical Fiber 21 constitute a resonant cavity; The another one reflection peak 101B of polarization-preserving sampling optical fiber optical grating and the second band optical fiber optical grating reflection peak 121, second section er-doped Active Optical Fiber 22 constitute a resonant cavity; The another one reflection peak 102A of polarization-preserving sampling optical fiber optical grating and the 3rd band optical fiber optical grating reflection peak 131, the 3rd section er-doped Active Optical Fiber 23 constitute a resonant cavity, and this three chambeies resonance under the effect of pump light 30 produces the laser of three single polarization wavelength.At coupler one word end 40 output three-wavelength list polarization lasers.
Embodiment two
Constitute the connection between the parts of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser, as Fig. 5 and Fig. 6:
1. select one 1 * 8 coupler, at the in-line arm 50 access polarization-preserving sampling optical fiber optical gratings 10 of coupler.
2. select suitable length 8 sections: first mix ytterbium Active Optical Fiber 21, second mix ytterbium Active Optical Fiber 22 ..., the 8th mix ytterbium Active Optical Fiber 28.First section mix ytterbium Active Optical Fiber 21, second section mix ytterbium Active Optical Fiber 22 ..., the 8th section mix first fen yoke 51 that ytterbium Active Optical Fiber 28 is connected respectively to coupler, second fen yoke 52 ..., on the 8th fen yoke 58.
First section mix ytterbium Active Optical Fiber 21, second section mix ytterbium Active Optical Fiber 22 ..., the 8th section mix ytterbium Active Optical Fiber 28 away from the coupler end, insert respectively the first band optical fiber grating 11, the second band optical fiber grating 12 ..., the 8th band optical fiber grating 18, first to eight band optical fiber grating reflection spectrum is spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-preserving sampling optical fiber optical grating of lap correspondence hangs down 1dB at least.
4. utilize pumping coupler be connected the first band optical fiber grating 11, the second band optical fiber grating 12 ..., first pump light 31 of the back of the 8th band optical fiber grating 18, second pump light 32 ..., the 8th pump light 38 is coupled into and mixes the ytterbium Active Optical Fiber;
Any 8 reflection peaks of polarization-preserving sampling optical fiber optical grating 10 respectively with the first band optical fiber grating 11, the second band optical fiber grating 12 ..., the 8th band optical fiber grating 18 forms the different wavelength of laser resonant cavitys, produce laser, at single polarization 8 wavelength lasers of a word end 40 outputs of coupler.
6. the length of mixing the ytterbium Active Optical Fiber of described selection, minimum length is 1cm, maximum length is by the decisions such as loss of coupler in pumping light power, absorption coefficient, the laser cavity.Be that maximum length is:
Under given first pump light, 31 effects, mix the chamber that ytterbium Active Optical Fiber 21, the first band optical fiber grating 11, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute for first section, can just encourage generation laser, the length that mix the ytterbium Active Optical Fiber this moment is exactly the maximum length in first chamber;
Under given second pump light, 32 effects, mix the chamber that ytterbium Active Optical Fiber 22, band optical fiber grating 12, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute for second section, can just encourage generation laser, the length that mix the ytterbium Active Optical Fiber this moment is exactly the maximum length in second chamber;
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Under given the 8th pump light 38 effects, the 8th section chamber that Active Optical Fiber 28, the 8th band optical fiber grating 18, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute, can just encourage generation laser, the length that mix the ytterbium Active Optical Fiber this moment is exactly the maximum length in the 8th chamber;
When only producing 8 wavelength lasers, only need from polarization-preserving sampling optical fiber optical grating, select 8 single reflection of polarization peaks, as choose polarization-preserving sampling optical fiber optical grating eight single reflection of polarization peak 101A, 101B......108B, promptly in this case, N=8.101A is single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating among Fig. 8, and 101B is the single reflection of polarization of the another one peak of polarization-preserving sampling optical fiber optical grating ... 108B is the 8th single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating.
111 is the reflection peak of the first band optical fiber grating 11, and 121 is the reflection peak of the second band optical fiber grating 12 ..., 181 is the reflection peak of the 8th band optical fiber grating 18.
Embodiment three
Constitute the connection between the parts of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser, as Fig. 7 and Fig. 8:
1. select one 1 * 16 coupler, at the in-line arm 50 access polarization-preserving sampling optical fiber optical gratings 10 of coupler.
2. select the N=16 section of suitable length: first section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 21, second section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 22 ..., the 16 section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 216.First section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 21, second section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 22 ..., the 16 section protect first fen yoke 51 that inclined to one side erbium and ytterbium codoping Active Optical Fiber 216 is connected to coupler, first fen yoke 52 ..., on the 16 fen yoke 516.
First section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 21, second section protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 22 ..., the 216th section away from the coupler end insert respectively the first band optical fiber grating 11, the second band optical fiber grating 12 ..., the 16 band optical fiber grating 116; The first band optical fiber grating 11, the second band optical fiber grating 12 ..., the reflectance spectrum of the 16 band optical fiber grating 116 is spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-preserving sampling optical fiber optical grating of lap correspondence hangs down 1dB at least.
4. utilize pumping coupler the pump light on the in-line arm 30 and be connected the first band optical fiber grating 11, the second band optical fiber grating 12 ..., first pump light 31 of the 16 band optical fiber grating 116 back, the second pump light 32...... the 16 pump light 316 be coupled into and protect inclined to one side erbium and ytterbium codoping Active Optical Fiber.
Utilize pumping coupler be connected the first band optical fiber grating 11, the second band optical fiber grating 12 ..., the back of the 8th band optical fiber grating 18, first pump light 31, second pump light 32 ..., the 8th pump light 38 is coupled into and mixes the ytterbium Active Optical Fiber;
Any 16 reflection peaks of polarization-preserving sampling optical fiber optical grating 10 respectively with the first to the 16 band optical fiber grating 11,12 ..., 116 form the different wavelength of laser resonant cavitys, produce laser, at single polarization 16 wavelength lasers of a word end 40 outputs of coupler.
6. the first to the 16 section minimum length of protecting inclined to one side erbium and ytterbium codoping Active Optical Fiber is 1cm, and maximum length is by the decisions such as loss of coupler in pumping light power, absorption coefficient, the laser cavity.Be that maximum length is exactly:
Under pump light on the given in- line arm 30 and 31 effects of first pump light, protect the chamber that inclined to one side erbium and ytterbium codoping Active Optical Fiber 21, the first band optical fiber grating 11, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute for first section, can just encourage generation laser, the length that protect inclined to one side erbium and ytterbium codoping Active Optical Fiber this moment is exactly the maximum length in first chamber;
Under pump light on the given in- line arm 30 and 32 effects of second pump light, second protects the chamber that inclined to one side erbium and ytterbium codoping Active Optical Fiber 22, the second band optical fiber grating 12, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute, can just encourage generation laser, the length that protect inclined to one side erbium and ytterbium codoping Active Optical Fiber this moment is exactly the maximum length in second chamber;
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Under pump light on the given in- line arm 30 and 316 effects of the 16 pump light, protect the chamber that inclined to one side erbium and ytterbium codoping Active Optical Fiber the 216, the 16 band optical fiber grating 116, coupler and polarization-preserving sampling optical fiber optical grating 10 constitute for the 16 section, can just encourage generation laser, the length that protect inclined to one side erbium and ytterbium codoping Active Optical Fiber this moment is exactly the maximum length in the 16 chamber;
When only producing 16 wavelength lasers, only need from polarization-preserving sampling optical fiber optical grating, select 16 single reflection of polarization peaks, as choose polarization-preserving sampling optical fiber optical grating 16 single reflection of polarization peak 101A, 101B......1016B, promptly in this case, N=16.Among Fig. 8,101A is single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating, and 101B is the single reflection of polarization of the another one peak of polarization-preserving sampling optical fiber optical grating ... 1016B is the 16 single reflection of polarization peak of polarization-preserving sampling optical fiber optical grating; 111 is the reflection peak of the first band optical fiber grating 11, and 121 is the reflection peak of the second band optical fiber grating 12 ... 1161 is the reflection peak of the 16 band optical fiber grating 1016.First reflection peak 101A of polarization-preserving sampling optical fiber optical grating and the first band optical fiber optical grating reflection peak 111, first are protected inclined to one side erbium and ytterbium codoping Active Optical Fiber 21 and are constituted a resonant cavity; Second the reflection peak 101B of polarization-preserving sampling optical fiber optical grating and the second band optical fiber optical grating reflection peak 121, second are protected inclined to one side erbium and ytterbium codoping Active Optical Fiber 22 and are constituted a resonant cavity; ... the 16th reflection peak 108B of polarization-preserving sampling optical fiber optical grating and band optical fiber optical grating reflection peak 1161, protect inclined to one side erbium and ytterbium codoping Active Optical Fiber 116 and constitute a resonant cavity, this 16 chambeies resonance under the effect of pumping laser 31,32......316, the laser of 16 single polarization wavelength of generation.At coupler one word end 40 outputs 16 wavelength list polarization lasers.
Embodiment four
Constitute the connection between the parts of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser, as Fig. 1 and Fig. 2:
1) on the in-line arm 50 of 1 * N coupler, inserts polarization-preserving sampling optical fiber optical grating 10;
2) select the N section Active Optical Fiber of suitable length: first section Active Optical Fiber 21, second section Active Optical Fiber 22 ..., N section Active Optical Fiber 2N be connected to first fen yoke 51 of coupler, second fen yoke 52 ..., N divides on the yoke 5N; N is the consecution natural number from 1;
3) first section Active Optical Fiber 21, second section Active Optical Fiber 22 ..., N section Active Optical Fiber N away from the coupler end, insert respectively the first band optical fiber grating 11, the second band optical fiber grating 12 ..., N band optical fiber grating 1N;
4) utilize pumping coupler the pump light on the in-line arm 30 or/and be connected the first band optical fiber grating 11, the second band optical fiber grating 12 ..., first pump light 31 of N band optical fiber grating 1N back, the second pump light 32...... N pump light 3N be coupled into Active Optical Fiber.
5) any N reflection peak of polarization-preserving sampling optical fiber optical grating 10 respectively with the first band optical fiber grating 11, the second band optical fiber grating 12 ..., 1N band optical fiber grating 1N forms the different wavelength of laser resonant cavity, produce laser, at the single polarization N wavelength laser of a word end 40 outputs of coupler.
First minimum length of protecting inclined to one side erbium and ytterbium codoping Active Optical Fiber to the N section is 1cm, and maximum length is by the decisions such as loss of coupler in pumping light power, absorption coefficient, the laser cavity.
The maximum length of the Active Optical Fiber in each chamber is selected with above-mentioned embodiment.
It is arbitrarily that the reflection peak of polarization-preserving sampling optical fiber optical grating is chosen, and serial number only for the purpose of simplifying the description.
The employed parts of novel single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser a kind of effective, reliable, that can export with single polarization wavelength more than that the present invention proposes all be the parts of using always.
Claims (2)
1. single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser is characterized in that, constitutes the connection between the parts of this laser:
1) on the in-line arm (50) of 1 * N coupler, inserts polarization-preserving sampling optical fiber optical grating (10);
2) first section Active Optical Fiber (21), second section Active Optical Fiber (22) to N section Active Optical Fiber (2N) be connected respectively to coupler first fen yoke (51), second minute yoke (52) divide on the yoke (5N) to N; N is the consecution natural number from 2;
3) first section Active Optical Fiber (21), second section Active Optical Fiber (22) to N section Active Optical Fiber (2N) away from the coupler end, insert the first band optical fiber grating (11), the second band optical fiber grating (12) respectively to N band optical fiber grating (1N);
4) utilize pumping coupler the pump light on the in-line arm (30) or/and be connected the first band optical fiber grating (11), the second band optical fiber grating (12) to first pump light (31), second pump light (32) to the N pump light (3N) of N band optical fiber grating (1N) back is coupled into Active Optical Fiber;
5) any N reflection peak of polarization-preserving sampling optical fiber optical grating (10) forms the different wavelength of laser resonant cavity with the first band optical fiber grating (11), the second band optical fiber grating (12) to N band optical fiber grating (1N) respectively, produce laser, at the single polarization N wavelength laser of a word end (40) output of coupler.
2. single-polarization multi-wavelength polarization-preserving sampling optical fiber optical grating laser according to claim 1 is characterized in that: Active Optical Fiber is for protecting inclined to one side Active Optical Fiber, all selects er-doped for use or mixes ytterbium or mix holmium or the ytterbium erbium is mixed or mixed thorium altogether or mixes praseodymium or neodymium-doped fiber.
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| CN102253454A (en) * | 2011-04-07 | 2011-11-23 | 杭州山旭光电有限公司 | All-optical fiber light splitting device |
| CN102522681A (en) * | 2011-12-16 | 2012-06-27 | 北京交通大学 | Single longitudinal mode optical fibre laser with multi-cavity structure based on optical fibre coupler |
| CN105953826A (en) * | 2013-11-21 | 2016-09-21 | 充梦霞 | Laser sensor frequency division multiplexing device adopting optical fiber coupler and fiber bragg grating |
| CN113495322B (en) * | 2020-04-01 | 2022-06-10 | 华为技术有限公司 | Optical splitter, optical distribution network and system for determining topology of optical access network |
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