CN103513327A - Bent and insensitive multimode optical fiber and manufacturing method thereof - Google Patents
Bent and insensitive multimode optical fiber and manufacturing method thereof Download PDFInfo
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- CN103513327A CN103513327A CN201310411785.7A CN201310411785A CN103513327A CN 103513327 A CN103513327 A CN 103513327A CN 201310411785 A CN201310411785 A CN 201310411785A CN 103513327 A CN103513327 A CN 103513327A
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Abstract
The invention discloses a bent and insensitive multimode optical fiber. A light guiding interface layer is arranged between a core rod and an outer wrapping layer, a conduit interface layer is formed by a fluoride-doped inner wrapping layer tube arranged on the core rod in a sleeved mode, and the outer wrapping layer wraps the fluoride-doped inner wrapping layer tube. The manufacturing method includes the first step of manufacturing the core rod, the second step of manufacturing the fluoride-doped inner wrapping layer tube, the third step of manufacturing the outer wrapping layer, enabling a silica dioxide porous body to be deposited outside a fluoride-doped transparent silicon dioxide glass tube, and obtaining the outer wrapping layer wrapping a fluoride-doped inner wrapping layer, the fourth step of manufacturing an integral fiber rod, heating a pipe body which is subjected to the third step, inserting the core rod which is manufactured in the first step into the pipe body, and sintering the core rod and the pipe body into a whole to form the integral fiber rod, and the fifth step of carrying out optical fiber drawing. Through the method, the conductivity of an original high-order guided mode in an optical fiber core is enhanced greatly and the bending resistance of the optical fiber is improved effectively; the manufacturing method can be used for accurately controlling the refractive index distribution of the optical fiber, eliminating center sag and improving the properties of the optical fiber.
Description
Technical field
The present invention relates to field fiber, particularly relate to a kind of bend-insensitive multimode optical fiber and preparation method thereof.
Background technology
Fast development along with FTTx, a large amount of multimode optical fibers have been come into indoor, the wiring under indoor and narrow environment, and optical fiber stands higher bending stress, particularly in application, long optical fiber is wrapped in the storage box of more and more miniaturization conventionally, and optical fiber will bear very large bending stress.Herewith, the decay of optical cable and mechanical resistance bending property have been proposed to requirements at the higher level.In order to address these problems, bend-insensitive multimode optical fiber has arisen at the historic moment, and adopts the inside cable of bend-insensitive multimode optical fiber can simplify installation to a certain extent, thereby reduces installation cost, and reduced the risk of system break or inefficacy.Because bend-insensitive multimode optical fiber has many advantages, once releasing the favor that has just been subject to market.
As everyone knows, though single mode or multimode optical fiber, the larger person of numerical aperture (NA), and its bending resistance is better.This be because, larger its fibre core of person of numerical aperture (NA) and cladding index are poor also larger, the waveguide ability of optical fiber is also stronger.In multimode optical fiber, the refringence of the optical fiber of fibre core 62.5 μ m is the twice of the optical fiber of fibre core 50 μ m, thereby the latter's bending resistance is poor, because of the basic model design of the optical fiber of fibre core 50 μ m, fix, cannot improve its bending resistance by increasing its refringence.
In conventional multimode optical fiber, guided mode is in leading by force state at a low price, and in the high order guided modes of propagating near fibre core-covering interface, because therefore its effective refractive index approaches cladding index in the weak state of leading, in the weak high order guided modes of leading state at fiber bending radius too hour, its light intensity fibre core of can overflowing, causes signal distortion.
The transmission performance of multimode optical fiber is mainly the DMD phenomenon that is limited to multimode optical fiber.Multimode optical fiber is in transmitting light pulse process, broadening is dispersed in light pulse meeting, when this disperse situation seriously to a certain extent after, stack mutually between the pulse of front and back, make receiving end cannot accurately differentiate each light pulse signal, we are called DMD(Differential Mode Delay this phenomenon).
Its main cause is: what one, fiber core refractive index distributed is imperfect.The DMD of multimode optical fiber is the combined effect in the travel-time of the incident pulse of different radial positions and optical fiber intermode dispersion characteristic, for the multimode optical fiber of parabolic type refractive index profile, can design good DMD characteristic.But the little deviation of DMD refractive index section is very responsive, therefore in the making of multimode optical fiber, must very accurately control, realize the design load that perfect refractive index profile distributes.Two, the central concave of optical fiber.The central concave of optical fiber refers to the obvious phenomenon declining of refractive index at core centre.The manufacture process of this depression and optical fiber is relevant.This central concave will affect the transport property of optical fiber, reduces the performance of optical fiber.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of bend-insensitive multimode optical fiber and preparation method thereof, can utilize a leaded light interface, strengthened widely the conduction of fiber core Central Plains high order guided modes, thereby make the high order guided modes of leading state a little less than being originally be converted into the state of leading by force, the doping of effectively controlling sedimentary deposit requires to obtain with theory the index distribution meeting, in sintering process, by controlling the size of etching extent and center pit, avoid the appearance of fiber optic hub depression simultaneously.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of bend-insensitive multimode optical fiber is provided, comprise: plug and surrounding layer, between described plug and surrounding layer, be provided with a leaded light contact bed, described conduit contact bed is one to be sheathed on and to mix fluorine inner cladding pipe on plug, and described surrounding layer is coated on to be mixed outside fluorine inner cladding pipe;
Described leaded light contact bed makes to have formed a ramp type refractive index bogging down area between plug and surrounding layer, and wherein, plug district refractive index profile distributes and is para-curve, and its distribution formula is
, in formula
for plug refractive index of the centre,
for plug radius,
for radial coordinate; Refringence is
, wherein,
refractive index for surrounding layer basal plane;
In outer cladding region, refractive index bogging down area refringence is
, wherein,
for the sagging refractive index of surrounding layer,
for bogging down area radius.
In a preferred embodiment of the present invention, from inside to outside, gradual change from small to large, forms leaky mode to the refractive index of ramp type refractive index bogging down area.
In a preferred embodiment of the present invention, the effective refractive index n of described leaky mode
effbe less than the refractive index of surrounding layer basal plane
.
In a preferred embodiment of the present invention, described in mix fluorine inner cladding pipe and comprise a hollow body, the porous body of deposition of silica on described hollow body, in described porous body, infiltration has fluoro-gas.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of method for making of bend-insensitive multimode optical fiber is provided, comprises the following steps:
1) make plug,
A, a foundation pipe is kept to rotation status;
B, with oxygen as carrier gas by there being SiCI
4, GeCI
4etc. the bubbling bottle of pure chemistry raw material, oxygen carrier gas is by SiCI
4, GeCI
4saturated vapor deliver into together in base tube;
C, utilize temperature to arrive 1400 ℃-1600
othe flame of C, in the heating of base tube outer wall, makes the gas phase material in base tube that oxidation reaction at high temperature occur, and generates SiO
2, GeO
2on base tube inwall Deng oxide ，Bing high-temperature region airflow downstream, form the sedimentary deposit of fritted glass dust;
D, flame are from left to right mobile once forms corresponding sedimentary deposit uniformly at base tube inwall, then returns to original place, moves and so forth until complete plug making;
2) make and mix fluorine inner cladding pipe,
A, on a hollow body deposition of silica porous body, make porous silica pipe;
B, the porous silica pipe of making is heated, and at body center logical fluoro-gas, make fluoro-gas radial infiltration of mind-set porous silica pipe from body, make and mix fluorodioxy SiClx antipriming pipe;
C, last, sinters the fluorodioxy SiClx antipriming pipe of mixing that completes infiltration into mix fluorine transparent silicon dioxide glass tube;
3) make surrounding layer, mixing the transparent silicon dioxide glass tube external sediment porous silica body of fluorine, make and be coated on the surrounding layer of mixing outside fluorine inner cladding;
4) make integral optical fiber rod, first by completing steps 3) body heat, then the plug that step 1) is completed inserts in body, and both are sintered into one, and forms integral optical fiber rod;
5) drawing optical fibers, is drawn into optical fiber by the optical fibre rod completing, and at optical fiber surface coating protective coating.
In a preferred embodiment of the present invention, the base tube described in step 1) is quartzy base tube, and flame is oxyhydrogen flame.
In a preferred embodiment of the present invention, the chlorine that in step 1), reaction produces and the gas phase material not reacted are discharged from the outlet of base tube, carry out waste gas neutralisation treatment.
In a preferred embodiment of the present invention, step 2) in, be porous silica pipe to be put into heating furnace heat, the logical fluoro-gas at body center simultaneously.
In a preferred embodiment of the present invention, step 2) in, to before mixing fluorodioxy SiClx antipriming pipe sintering, at this body, be common to helium and the chlorine of drying and dehydrating outward.
In a preferred embodiment of the present invention, in step 4) first by completing steps 3) body put into heating furnace and heat, then plug is inserted to body, and this body is common to helium and the chlorine of drying and dehydrating in heating furnace outward.
The invention has the beneficial effects as follows: a kind of bend-insensitive multimode optical fiber of the present invention is at plug and surrounding layer intersection, by mixing fluorine, form sagging ramp type index distribution district, thereby make the high order guided modes of propagating near plug-surrounding layer interface have an effective leaded light interface, strengthened widely the conduction of fiber core Central Plains high order guided modes, thereby make the high order guided modes of leading state a little less than being originally be converted into the state of leading by force, thereby effectively improved the bending resistance of optical fiber; Manufacture craft of the present invention can accurately be controlled the index distribution of optical fiber and eliminate central concave, improves optical fiber property.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also according to these accompanying drawings, obtain other accompanying drawing, wherein:
Fig. 1 is the refractive index profile figure of a kind of bend-insensitive multimode optical fiber one preferred embodiment of the present invention;
Fig. 2 is the structural representation of a kind of bend-insensitive multimode optical fiber one preferred embodiment of the present invention;
Fig. 3 is the structural representation while making plug in the multimode optical fiber of bend-insensitive shown in Fig. 2;
Fig. 4 makes the structural representation while mixing fluorine inner cladding pipe in the multimode optical fiber of bend-insensitive shown in Fig. 2;
Fig. 5 is the structural representation while making surrounding layer in the multimode optical fiber of bend-insensitive shown in Fig. 2;
Fig. 6 is the structural representation while making integral optical fiber rod in the multimode optical fiber of bend-insensitive shown in Fig. 2;
In accompanying drawing, the mark of each parts is as follows: 1, plug, 2, surrounding layer, 3, mix fluorine inner cladding pipe, 4, base tube, 5, oxygen, 6, bubbling bottle, 7, oxyhydrogen flame, 8, sedimentary deposit, 9, hollow body, 10, porous silica body, 11, heating furnace, 12, fluoro-gas, 13, mix fluorodioxy SiClx antipriming pipe.
Embodiment
Below the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1-Fig. 6, the embodiment of the present invention comprises:
A kind of bend-insensitive multimode optical fiber, as shown in Figure 2, comprising: plug 1 and surrounding layer 2, be provided with a leaded light contact bed between described plug 1 and surrounding layer 2, described conduit contact bed is one to be sheathed on and to mix fluorine inner cladding pipe 3 on plug 1, and described surrounding layer 2 is coated on to be mixed outside fluorine inner cladding pipe 3.
Described plug 1 is for mixing the silicon dioxide plug of germanium or phosphorus.The described fluorine inner cladding pipe 3 of mixing comprises a hollow body 9, the porous body of deposition of silica on described hollow body 9, and in described porous body, infiltration has fluoro-gas 12.Described surrounding layer 2 is for being deposited on the porous silica body 10 of mixing outside fluorine inner cladding pipe 3.
As shown in Figure 1, to take 50 μ m multimode optical fibers of standard be example to embodiments of the invention:
Described leaded light contact bed makes to have formed a ramp type refractive index bogging down area between plug 1 and surrounding layer 2, and wherein, plug district refractive index profile distributes and is para-curve, and its distribution formula is
, in formula
for plug refractive index of the centre, plug radius
,
for radial coordinate; Refringence is
, wherein,
refractive index for surrounding layer basal plane;
In outer cladding region, refractive index bogging down area refringence is
, wherein,
for the sagging refractive index of surrounding layer, bogging down area radius
.
At plug 1 and surrounding layer 2 intersections, mix fluorine inner cladding pipe 3, by mixing fluorine, form sagging ramp type index distribution district, thereby make the high order guided modes of propagating near plug 1-surrounding layer 2 interfaces have an effective leaded light interface, strengthened widely the conduction of fiber core Central Plains high order guided modes, thereby made the high order guided modes of leading state a little less than being originally be converted into the state of leading by force.
In the index distribution of ramp type refractive index bogging down area, the obvious refractive power face of neither one, its interfacial refraction rate from inside to outside, from small to large.Thereby the light loss of having avoided light intensity tail field effusion refractive power face to cause.Due to this special refractive index profile structure, in bend-insensitive multimode optical fiber of the present invention, exist conductive leaky mode, the effective refractive index n of leaky mode
effbe less than cladding index n
2.Leaky mode is the solution of eigen[value outside cut-off region, leaky mode is that the parsing of guided mode outside cut-off region is continuous, theirs is identical, but its eigenvalue or propagation constant are the plural number solutions of eigen[value, thereby leaky mode has natural attenuation and cannot normal propagation in the air.The effective refractive index n of leaky mode
effbe less than cladding index n
2.
In conventional multimode optical fiber, leaky mode consumption declines very soon, because do not have refractive index structures can support it to propagate in optical fiber in conventional fiber.And just in bend-insensitive multimode optical fiber of the present invention, the refractive index profile version that this is special, is maintaining the conduction in the high order guided modes of propagating near plug 1-surrounding layer 2 interfaces, thereby has effectively improved the bending resistance of optical fiber surgingly.
A method for making for bend-insensitive multimode optical fiber, comprises the following steps:
1) by MCVD or PCVD technique, make plug 1, the present invention be take MCVD technique as example, as shown in Figure 3,
A, a quartzy base tube 4 is placed on glass work lathe and keeps rotation;
B, with oxygen 5 as carrier gas by there being SiCI
4, GeCI
4etc. the bubbling bottle 6 of pure chemistry raw material, oxygen 5 carrier gas are by SiCI
4, GeCI
4saturated vapor deliver into together in quartzy base tube 4;
C, utilize temperature to arrive 1400 ℃-1600
othe oxyhydrogen flame 7 of C, in base tube 4 outer wall heating, makes the gas phase material in base tube 4 that oxidation reaction at high temperature occur, and reaction equation is:
SiCI
4+O
2→SiO
2+2CI
2↑
GeCI
4+O
2→GeO
2+2CI
2↑
Generate SiO
2, GeO
2on base tube 4 inwalls Deng oxide ，Bing high-temperature region airflow downstream, form the sedimentary deposit 8 of fritted glass dust;
D, when the high-temperature region of oxyhydrogen flame 7 is through herein time, glass dust is sintered into the glassy layer that is deposited on the homogeneous transparent on inwall, oxyhydrogen flame 7 from left to right moves once, at base tube 4 inwalls, form uniformly corresponding sedimentary deposit 8, then return to original place, move and so forth until complete plug 1 making;
The chlorine that reaction produces and the gas phase material not reacted are discharged from the outlet of base tube 4, carry out waste gas neutralisation treatment.Sedimentary deposit 8 is layer by layer deposition from outside to inside, and refractive index profile is by regulating GeO with mass flow controller
2the flow of the carrier gas forming is controlled.
Therefore can obtain, in the matrix of silicon dioxide, doped with Ge O
2and P
2o
5contribute to the increase of refractive index, mix fluorine and make refractive index decline.
2) by OVD method, make and mix fluorine inner cladding pipe 3, as shown in Figure 4,
A, on a hollow body 9 deposition of silica porous body 10, make porous silica pipe;
B, the porous silica pipe of making put into heating furnace 11 heat, and at body center logical fluoro-gas 12, as SiF
4, CF
4, C
2f
6deng, make fluoro-gas 12 radial infiltration of mind-set porous silica pipe from body, make and mix fluorodioxy SiClx antipriming pipe 13; The fluorinated volume of porous silica pipe is reduced from inside to outside gradually, thereby form sagging distribution of ramp type refractive index of inner cladding, at porous silica pipe, be common to helium and the chlorine of drying and dehydrating simultaneously outward.
C, last, sinters the fluorodioxy SiClx antipriming pipe 13 of mixing that completes infiltration into mix fluorine transparent silicon dioxide glass tube, and this pipe can be stretched, and the pipe that cuts off formation required size enters next procedure.
3) make surrounding layer 2, by OVD method, mixing fluorodioxy SiClx antipriming pipe 13 external sediment porous silica bodies 10, make and be coated on the surrounding layer 2 of mixing outside fluorine inner cladding, as shown in Figure 5;
4) make integral optical fiber rod, as shown in Figure 6, first by completing steps 3) body put into heating furnace 11 and heat, the plug 1 again step 1) being completed inserts in body, and at interior helium and the chlorine that this body is common to drying and dehydrating outward of heating furnace 11, and both high temperature sinterings are integral, in the process of sintering, having one radial inside power to be added to mixes on fluorine inner cladding pipe 3, this power further makes inwardly radial being pressed on plug 1 of inner cladding glass tube, thereby makes three be fused into an integral optical fiber rod;
5) drawing optical fibers, it is 125 μ m optical fiber that the optical fibre rod completing is drawn into diameter, and is 245 μ m protective coatings at optical fiber surface coating diameter.
Bend-insensitive multimode optical fiber of the present invention is at plug and surrounding layer intersection, by mixing fluorine, form sagging ramp type index distribution district, thereby make the high order guided modes of propagating near plug-surrounding layer interface have an effective leaded light interface, strengthened widely the conduction of fiber core Central Plains high order guided modes, thereby make the high order guided modes of leading state a little less than being originally be converted into the state of leading by force, thereby effectively improved the bending resistance of optical fiber; Manufacture craft of the present invention can accurately be controlled the index distribution of optical fiber and eliminate central concave, improves optical fiber property.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a bend-insensitive multimode optical fiber, it is characterized in that, comprising: plug and surrounding layer, be provided with a leaded light contact bed between described plug and surrounding layer, described conduit contact bed is one to be sheathed on and to mix fluorine inner cladding pipe on plug, and described surrounding layer is coated on to be mixed outside fluorine inner cladding pipe;
Described leaded light contact bed makes to have formed a ramp type refractive index bogging down area between plug and surrounding layer, and wherein, plug district refractive index profile distributes and is para-curve, and its distribution formula is
, in formula
for plug refractive index of the centre,
for plug radius,
for radial coordinate; Refringence is
, wherein,
refractive index for surrounding layer basal plane;
In outer cladding region, refractive index bogging down area refringence is
, wherein,
for the sagging refractive index of surrounding layer,
for bogging down area radius.
2. bend-insensitive multimode optical fiber according to claim 1, is characterized in that, from inside to outside, gradual change from small to large, forms leaky mode to the refractive index of ramp type refractive index bogging down area.
3. bend-insensitive multimode optical fiber according to claim 2, is characterized in that, the effective refractive index n of described leaky mode
effbe less than the refractive index of surrounding layer basal plane
.
4. bend-insensitive multimode optical fiber according to claim 1, is characterized in that, described in mix fluorine inner cladding pipe and comprise a hollow body, the porous body of deposition of silica on described hollow body, in described porous body, infiltration has fluoro-gas.
5. the method for making of bend-insensitive multimode optical fiber according to claim 1, is characterized in that, comprises the following steps:
1) make plug,
A, a foundation pipe is kept to rotation status;
B, with oxygen as carrier gas by there being SiCI
4, GeCI
4etc. the bubbling bottle of pure chemistry raw material, oxygen carrier gas is by SiCI
4, GeCI
4saturated vapor deliver into together in base tube;
C, utilize temperature to arrive 1400 ℃-1600
othe flame of C, in the heating of base tube outer wall, makes the gas phase material in base tube that oxidation reaction at high temperature occur, and generates SiO
2, GeO
2on base tube inwall Deng oxide ，Bing high-temperature region airflow downstream, form the sedimentary deposit of fritted glass dust;
D, flame are from left to right mobile once forms corresponding sedimentary deposit uniformly at base tube inwall, then returns to original place, moves and so forth until complete plug making;
2) make and mix fluorine inner cladding pipe,
A, on a hollow body deposition of silica porous body, make porous silica pipe;
B, the porous silica pipe of making is heated, and at body center logical fluoro-gas, make fluoro-gas radial infiltration of mind-set porous silica pipe from body, make and mix fluorodioxy SiClx antipriming pipe;
C, last, sinters the fluorodioxy SiClx antipriming pipe of mixing that completes infiltration into mix fluorine transparent silicon dioxide glass tube;
3) make surrounding layer, mixing the transparent silicon dioxide glass tube external sediment porous silica body of fluorine, make and be coated on the surrounding layer of mixing outside fluorine inner cladding;
4) make integral optical fiber rod, first by completing steps 3) body heat, then the plug that step 1) is completed inserts in body, and both are sintered into one, and forms integral optical fiber rod;
5) drawing optical fibers, is drawn into optical fiber by the optical fibre rod completing, and at optical fiber surface coating protective coating.
6. the method for making of bend-insensitive multimode optical fiber according to claim 5, is characterized in that, the base tube described in step 1) is quartzy base tube, and flame is oxyhydrogen flame.
7. the method for making of bend-insensitive multimode optical fiber according to claim 5, is characterized in that, the chlorine that in step 1), reaction produces and the gas phase material not reacted are discharged from the outlet of base tube, carry out waste gas neutralisation treatment.
8. the method for making of bend-insensitive multimode optical fiber according to claim 5, is characterized in that step 2) in be porous silica pipe to be put into heating furnace heat, the logical fluoro-gas at body center simultaneously.
9. the method for making of bend-insensitive multimode optical fiber according to claim 5, is characterized in that step 2) in, to before mixing fluorodioxy SiClx antipriming pipe sintering, at this body, be common to helium and the chlorine of drying and dehydrating outward.
10. the method for making of bend-insensitive multimode optical fiber according to claim 5, it is characterized in that, in step 4) first by completing steps 3) body put into heating furnace and heat, again plug is inserted to body, and this body is common to helium and the chlorine of drying and dehydrating in heating furnace outward.
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| CN104049299A (en) * | 2014-03-31 | 2014-09-17 | 江苏科信光电科技有限公司 | Bending-insensitive single mode fiber and manufacturing method thereof |
| CN103995314A (en) * | 2014-06-13 | 2014-08-20 | 江苏七宝光电集团有限公司 | Bending insensitive single mode fiber and production technology thereof |
| CN111320373A (en) * | 2018-12-15 | 2020-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method of making |
| CN111320373B (en) * | 2018-12-15 | 2023-06-23 | 中天科技精密材料有限公司 | Optical fiber preform and method of making |
| CN110927864A (en) * | 2019-12-11 | 2020-03-27 | 中国电子科技集团公司第四十六研究所 | Metal semiconductor composite microstructure optical fiber for micro optical detector and preparation method thereof |
| CN111781673A (en) * | 2020-07-08 | 2020-10-16 | 普天线缆集团有限公司 | Novel ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112051640A (en) * | 2020-07-08 | 2020-12-08 | 普天线缆集团有限公司 | Ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN111781673B (en) * | 2020-07-08 | 2022-06-28 | 普天线缆集团有限公司 | Novel ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112051640B (en) * | 2020-07-08 | 2022-11-04 | 普天线缆集团有限公司 | Ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112764155A (en) * | 2021-01-12 | 2021-05-07 | 烽火通信科技股份有限公司 | Hard cladding rare earth-doped optical fiber and preparation method thereof |
| CN114779394A (en) * | 2022-06-17 | 2022-07-22 | 武汉华锐超快光纤激光技术有限公司 | Normal dispersion thulium-doped single-mode optical fiber, preparation method thereof and laser |
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