CN113900174A - Rare earth doped optical fiber with Lelo triangular fiber core - Google Patents
Rare earth doped optical fiber with Lelo triangular fiber core Download PDFInfo
- Publication number
- CN113900174A CN113900174A CN202111072141.0A CN202111072141A CN113900174A CN 113900174 A CN113900174 A CN 113900174A CN 202111072141 A CN202111072141 A CN 202111072141A CN 113900174 A CN113900174 A CN 113900174A
- Authority
- CN
- China
- Prior art keywords
- core
- triangular
- fiber
- optical fiber
- inner cladding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 57
- 239000013307 optical fiber Substances 0.000 title claims abstract description 55
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 30
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 18
- 238000005253 cladding Methods 0.000 claims abstract description 81
- 229920000433 Lyocell Polymers 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 5
- 230000002535 lyotropic effect Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 10
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000013459 approach Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009022 nonlinear effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 235000009581 Balanites aegyptiaca Nutrition 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02357—Property of longitudinal structures or background material varies radially and/or azimuthally in the cladding, e.g. size, spacing, periodicity, shape, refractive index, graded index, quasiperiodic, quasicrystals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02361—Longitudinal structures forming multiple layers around the core, e.g. arranged in multiple rings with each ring having longitudinal elements at substantially the same radial distance from the core, having rotational symmetry about the fibre axis
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a rare earth doped optical fiber with a Lelo triangular fiber core, which comprises the following structural components in part by weight: a lyocell triangular core, a lyocell triangular inner cladding, and a circular outer cladding. Wherein, the round outer cladding layer part adopts pure silicon dioxide which is not doped with rare earth elements; the Leluo triangular fiber core part adopts silicon dioxide doped with rare earth elements, so that the optical refractive index of the fiber core part is higher than that of the outer cladding layer; the Lelo triangular inner cladding portion dopes the silica with different types and concentrations of rare earth elements so that the optical refractive index of the inner cladding is lower than that of the outer cladding and the longitudinal acoustic velocity is lower than that of the core. The optical fiber has a simple structure, and has a larger effective area of an optical fundamental mode compared with a common optical fiber with a circular fiber core within a specific parameter range, so that the effect of inhibiting the stimulated Brillouin scattering effect in the optical fiber is achieved.
Description
Technical Field
The invention belongs to the technical field of optical fiber manufacturing, and particularly relates to a rare earth doped optical fiber with a Lelo triangular fiber core.
Background
Under the action of strong light, the medium can generate nonlinear effects including optical harmonic, frequency doubling, stimulated Raman scattering, stimulated Brillouin scattering, two-photon absorption, self-focusing effect and self-defocusing effect. The generation of nonlinear effects in the optical fiber often limits the power of the optical fiber laser and affects the output characteristics. The method has practical significance for inhibiting and even eliminating partial nonlinear effects in the optical fiber, such as stimulated Brillouin scattering effect, and further improving the output power of the optical fiber laser and the optical amplifier.
The main technical solutions at present for suppressing the stimulated brillouin scattering effect in an optical fiber, in other words, for increasing the threshold power of the stimulated brillouin scattering effect, are: the method is characterized in that the line width of seed laser is widened by phase modulation, short-pulse-width pulse seed laser is adopted, highly-doped or large-mode-field optical fiber is utilized to reduce the effective length of the optical fiber, a temperature gradient or a stress gradient is applied to widen the Brillouin gain spectrum of the optical fiber, the effective mode field area of the optical fiber is increased, and the like. The increase of the effective mode field area of the optical fiber can be realized by optimizing the geometric parameters and the optical refractive index of each position of the section of the optical fiber.
In mathematics, a simple strictly convex closed curve (oval curve) on a plane can make two tangent lines parallel to each other in each direction, namely the highest line and the lowest line in the direction, and the two tangent points are called as corresponding to each other. We refer to this kind of ovoid as an equal-width curve, which is a graph of equal-width curves if the distance between the highest and lowest lines in each direction is constant. Circular, is a typical constant width curve pattern. A lyocell polygon, also a pattern of equal width curves. Specific implementation of the Lelo polygon: firstly, a regular 2n + 1-sided polygon A is constructed1A2A3……A2n+1Respectively taking 2n +1 vertexes as the center of circle, A1To An+1The distance of (a) is 2n +1 circles with a radius, and the common part of the circles is the Lelo (2n +1) polygon. The case of the lelo triangle is when n is 1.
The mathematician babbie discovered a theorem in 1860: all the equal-width curves of width b have the same circumference π b, i.e., the circumference of a circle of diameter b. In addition, the area enclosed by the circumference is the largest in all simple closed curves with fixed length on the plane. For the optical fiber, under the condition that other parameters are kept unchanged, the larger the geometric area of the fiber core is, the larger the effective mode field area of the optical fiber is relatively.
Today's optical fibers are often based on a circular core, and the optical fiber parameters are further designed and adjusted to optimize the transmission performance of the optical fiber.
Disclosure of Invention
The present invention is directed to solve the above problems of the prior art, and an object of the present invention is to provide a rare-earth doped optical fiber with a lyocell triangular core.
The technical solution for realizing the purpose of the invention is as follows: the rare earth doped optical fiber comprises a Lelo triangular fiber core, a Lelo triangular inner cladding and a circular outer cladding which are sequentially arranged from inside to outside.
Further, the optical refractive index n of the Lelo triangular corecoreWidth b of core, optical refractive index n of the circular outer claddingcladAnd the laser wavelength λ satisfy the relation:
further, the width of the Lelo triangular fiber core is the distance from any vertex of the triangle to the arc of the opposite side.
Further, the circular outer cladding layer is made of pure silica material which is not doped with any other rare earth element.
Furthermore, the Lelo triangular fiber core is made of a silica material doped with rare earth elements, so that the optical refractive index of the Lelo triangular fiber core is higher than that of the circular outer cladding.
Furthermore, the Lelo triangular inner cladding is made of silica materials doped with rare earth elements of different types and different concentrations, so that the optical refractive index of the Lelo triangular inner cladding is lower than that of the circular outer cladding, and the longitudinal sound velocity in the Lelo triangular inner cladding is lower than that in the Lelo triangular fiber core.
Compared with the prior art, the invention has the following remarkable advantages: 1) for any single-mode optical fiber meeting the conditions, the refractive index and the width of the inner cladding are adjusted, so that the effective mode field area of the optical fiber can be increased; 2) the values of the refractive index and the width of the inner cladding of the optical fiber are not unique, and appropriate parameters can be selected according to production level and design requirements, so that the optical fiber has stronger adaptability; 3) the optical fiber has a simple structure, and has a larger effective area of an optical fundamental mode compared with a common optical fiber with a circular fiber core in a specific parameter range, thereby playing a role in inhibiting the stimulated Brillouin scattering effect in the optical fiber.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a schematic diagram of a rare earth doped fiber with a Lelo triangular core according to one embodiment.
FIG. 2 is a schematic diagram of the structure of a rare earth doped fiber with a circular core for comparison in one embodiment.
Fig. 3 is a diagram illustrating the correspondence between the area ratio of the equal-width reuleaux polygon to the circle and the number of polygon edges in one embodiment.
FIG. 4 shows the relationship between the effective mode field area of the round-core fiber and the width and refractive index of the inner cladding in one embodiment.
FIG. 5 shows the relationship between the effective mode field area of the fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the index of refraction of the Lelo polygon inner cladding is 1.455.
FIG. 6 shows the relationship between the effective mode field area of the optical fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the refractive index of the Lelo polygon inner cladding is 1.420.
FIG. 7 shows the fundamental mode shape of a Lelo triangular core fiber with a Lelo triangular inner cladding index of 1.420 and a width of 0.5um in one example.
Fig. 8 shows the correspondence between the effective mode field area of the optical fiber, the number of edges of the lyocell polygon, and the width of the inner cladding when the refractive index of the lyocell polygon inner cladding is 1.400 in the second embodiment.
Fig. 9 shows the correspondence between the effective mode field area of the optical fiber, the number of edges of the lyocell polygon, and the width of the inner cladding when the refractive index of the lyocell polygon inner cladding is 1.340 in the second embodiment.
FIG. 10 shows the fundamental mode shape of the Lelo triangular core fiber in example two with a Lelo triangular inner cladding index of 1.340 and a width of 1 um.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, in conjunction with fig. 1, a lyocell triangular core rare-earth doped optical fiber is provided, which includes a lyocell triangular core 1, a lyocell triangular inner cladding 2 and a circular outer cladding 3 arranged in sequence from inside to outside.
Further, in one embodiment, the optical refractive index n of the lyocell triangular core 1coreWidth b of the core, optical refractive index n of the circular outer cladding 2cladAnd the laser wavelength λ satisfy the relation:
further, in one embodiment, the width of the lyocell triangular core 1 is the distance from any vertex of the triangle to the arc of the opposite side.
Further, in one embodiment, the circular outer cladding layer 3 is a pure silica material that is not doped with any other rare earth elements.
Further, in one embodiment, the lyotropic triangular core 1 is made of a silica material doped with a rare earth element such as Ge, Yb, and the like, so that the optical refractive index of the lyotropic triangular core 1 is higher than that of the circular outer cladding 3.
Further, in one embodiment, the lyotropic triangular inner cladding 2 is made of silica material doped with different kinds and concentrations of rare earth elements such as fluorine F, boron B, etc. so that the optical refractive index of the lyotropic triangular inner cladding 2 is lower than that of the circular outer cladding 3, and the longitudinal sound velocity in the lyotropic triangular inner cladding 2 is lower than that in the lyotropic triangular core 1.
Illustratively, in one embodiment, the rare earth doped fiber of the lyocell triangular core of the present invention is further described. In this example, it will be verified by comparing the optical fiber proposed by the present invention with a rare earth doped fiber with a circular core. With reference to fig. 2, a rare earth doped fiber for comparative round core, the structure comprises: a circular core 21, a circular inner cladding 22 and a circular outer cladding 23. The diameter of the circular core is equal to the width of the lyocell triangular core 11, and the optical refractive index is equal. The width of the circular inner cladding is equal to the width of the Lelo triangular inner cladding 12, and the optical refractive index is equal.
With reference to fig. 3, the correspondence between the equal-width reuleaux polygon and the circular area ratio and the number of polygon sides is shown. The circle can be regarded as the case when the number of edges of the lyocell polygon approaches infinity. Circular area of diameter b is π b2And/4, and the area of the Lalo (2n +1) polygon of width b can be expressed as:
as n approaches infinity, the area ratio approaches 1, i.e., the rillo polygon is closer and closer to a circle, but the area is always smaller than the circle area.
Specifically, verification:
example 1
The present embodiment performs simulation calculations in conjunction with parameters of the HI1060 fiber: the core diameter was 5.3 μm, the refractive index was 1.4644; the cladding diameter was 125 μm and the refractive index was 1.458. The laser wavelength was 1.064 μm and the normalized frequency V was 2.1401< 2.405.
FIG. 4 shows the relationship between the effective mode field area of the circular-core fiber and the width and refractive index of the inner cladding. When the inner cladding width is greater than 1 μm, the main factor affecting the effective mode field area of the fiber is the refractive index of the inner cladding. When the inner cladding width is less than 1 μm, the effective mode field area of the fiber decreases rapidly with increasing inner cladding width.
FIG. 5 shows the relationship between the effective mode field area of the fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the index of refraction of the Lelo polygon inner cladding is 1.455. Wherein, the condition that the number of the sides is 3 corresponds to a Lelo triangular fiber core optical fiber; the infinite number of sides corresponds to a circular core fiber. At this time, for an inner cladding with any width, the effective mode field area of the lyocell polygonal core fiber is increased along with the increase of the number of sides, the effective mode field area of the circular core fiber is the largest, and the effective mode field area of the lyocell triangular core fiber is the smallest. Table one is the specific numerical values corresponding to fig. 5.
TABLE 1 correspondence of effective mode field area, shape and inner cladding width for an optical fiber having an inner cladding index of 1.455
FIG. 6 shows the relationship between the effective mode field area of the optical fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the refractive index of the Lelo polygon inner cladding is 1.420. Wherein, the condition that the number of the sides is 3 corresponds to a Lelo triangular fiber core optical fiber; the infinite number of sides corresponds to a circular core fiber. At this time, for the inner cladding with any width, the effective mode field area of the lyocell polygonal (the number of sides is more than or equal to 5) core fiber is still increased along with the increase of the number of sides, the effective mode field area of the circular core fiber is the maximum value, but the effective mode field area of the lyocell triangular core fiber is the maximum at this time. Table two is the specific values corresponding to fig. 6.
When the refractive index of the inner cladding is 1.420, the corresponding relation between the effective mode field area of the optical fiber and the shape and the width of the inner cladding
| Ring width/um | Aeff(3)/um2 | Aeff(5)/um2 | Aeff(7)/um2 | Aeff(9)/um2 | Aeff(11)/um2 | Aeff(○)/um2 |
| 0.1 | 26.2882 | 26.0492 | 26.0985 | 26.1280 | 26.1448 | 26.1819 |
| 0.15 | 24.8868 | 24.4467 | 24.4729 | 24.4951 | 24.5086 | 24.5395 |
| 0.2 | 23.6441 | 23.0408 | 23.0539 | 23.0722 | 23.0839 | 23.1119 |
| 0.25 | 22.5606 | 21.8189 | 21.8261 | 21.8432 | 21.8544 | 21.8814 |
| 0.3 | 21.6287 | 20.7619 | 20.7686 | 20.7864 | 20.7980 | 20.8262 |
| 0.35 | 20.8376 | 19.8490 | 19.8599 | 19.8800 | 19.8925 | 19.9232 |
| 0.4 | 20.1793 | 19.0611 | 19.0798 | 19.1032 | 19.1174 | 19.1512 |
| 0.45 | 19.6478 | 18.3812 | 18.4109 | 18.4381 | 18.4543 | 18.4921 |
| 0.5 | 19.2459 | 17.7950 | 17.8372 | 17.8695 | 17.8879 | 17.9294 |
| 0.55 | 18.9859 | 17.2897 | 17.3465 | 17.3838 | 17.4046 | 17.4517 |
| 0.6 | 18.9225 | 16.8547 | 16.9271 | 16.9701 | 16.9932 | 17.0434 |
FIG. 7 shows the fundamental mode shape of a Lelo triangular core fiber with a Lelo triangular inner cladding index of 1.420 and a width of 0.5um, in accordance with an embodiment of the present invention.
Example 2
The present embodiment performs simulation calculations in conjunction with parameters of the SMF28e fiber: the core diameter is 8.3 μm, and the refractive index is 1.4682; the cladding diameter was 125 μm and the refractive index was 1.4615. The laser wavelength is 1.55 μm and the normalized frequency V is 2.3569< 2.405.
FIG. 8 shows the relationship between the effective mode field area of the optical fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the refractive index of the Lelo polygon inner cladding is 1.400. Wherein, the condition that the number of the sides is 3 corresponds to a Lelo triangular fiber core optical fiber; the infinite number of sides corresponds to a circular core fiber. At this time, for an inner cladding with any width, the effective mode field area of the lyocell polygonal core fiber is increased along with the increase of the number of sides, the effective mode field area of the circular core fiber is the largest, and the effective mode field area of the lyocell triangular core fiber is the smallest. Table three is the specific numerical values corresponding to fig. 8.
When the refractive index of the inner cladding of the third layer is 1.400, the corresponding relation between the effective mode field area of the optical fiber and the shape and the width of the inner cladding
| Ring width/um | Aeff(3)/um2 | Aeff(5)/um2 | Aeff(7)/um2 | Aeff(9)/um2 | Aeff(○)/um2 |
| 0.1 | 53.48652 | 54.22108 | 54.56085 | 54.7101 | 54.94526 |
| 0.2 | 46.63694 | 47.27235 | 47.61473 | 47.7658 | 48.00294 |
| 0.3 | 41.86057 | 42.63173 | 43.00822 | 43.17118 | 43.42192 |
| 0.4 | 38.50758 | 39.50005 | 39.91717 | 40.09298 | 40.3587 |
| 0.5 | 36.11643 | 37.35253 | 37.80696 | 37.9949 | 38.27451 |
| 0.6 | 34.38807 | 35.85802 | 36.34569 | 36.54329 | 36.83466 |
| 0.7 | 33.12581 | 34.80784 | 35.32254 | 35.52805 | 35.82748 |
| 0.8 | 32.20822 | 34.06612 | 34.60064 | 34.81226 | 35.11568 |
| 0.9 | 31.53181 | 33.53791 | 34.08996 | 34.30532 | 34.61658 |
| 1 | 31.04052 | 33.16346 | 33.72561 | 33.94487 | 34.25556 |
FIG. 9 shows the relationship between the effective mode field area of the optical fiber and the number of edges of the Lelo polygon and the width of the inner cladding when the refractive index of the Lelo polygon inner cladding is 1.340. Wherein, the condition that the number of the sides is 3 corresponds to a Lelo triangular fiber core optical fiber; the infinite number of sides corresponds to a circular core fiber. At this time, for the inner cladding with any width, the effective mode field area of the lyocell polygonal core fiber (the number of sides is more than or equal to 5) is still increased along with the increase of the number of sides, and the effective mode field area of the circular core fiber is the maximum value. However, the effective mode field area of the lyocell triangular-core fiber is maximized when the inner cladding width is increased above 0.9 μm. Table four shows specific values corresponding to fig. 9.
TABLE IV when the refractive index of the inner cladding is 1.340, the corresponding relationship between the effective mode field area of the fiber, the shape and the width of the inner cladding
| Ring width/um | Aeff(3)/um2 | Aeff(5)/um2 | Aeff(7)/um2 | Aeff(9)/um2 | Aeff(○)/um2 |
| 0.1 | 46.74894 | 47.20136 | 47.51814 | 47.66067 | 47.88642 |
| 0.2 | 38.8383 | 39.29131 | 39.64952 | 39.80638 | 40.04789 |
| 0.3 | 34.77714 | 35.33948 | 35.75188 | 35.92592 | 36.18705 |
| 0.4 | 32.49933 | 33.1656 | 33.62512 | 33.81441 | 34.09217 |
| 0.5 | 31.15034 | 31.89293 | 32.39241 | 32.59292 | 32.88392 |
| 0.6 | 30.3556 | 31.12157 | 31.6521 | 31.86125 | 32.15954 |
| 0.7 | 29.99062 | 30.64772 | 31.1995 | 31.41444 | 31.71983 |
| 0.8 | 30.16146 | 30.35682 | 30.91949 | 31.13889 | 31.44323 |
| 0.9 | 31.50408 | 30.17076 | 30.74666 | 30.96776 | 31.27734 |
| 1 | 38.34894 | 30.05434 | 30.63861 | 30.86026 | 31.16708 |
FIG. 10 shows the fundamental mode shape of a Lelo triangular core fiber with a Lelo triangular inner cladding index of 1.340 and a width of 1um, in accordance with an embodiment of the present invention.
Therefore, the optical fiber has a simple structure, and has a larger effective area of an optical fundamental mode compared with a common optical fiber with a circular fiber core within a specific parameter range, so that the effect of inhibiting the stimulated Brillouin scattering effect in the optical fiber is achieved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The rare earth doped optical fiber with the Lelo triangular fiber core is characterized by comprising the Lelo triangular fiber core (1), a Lelo triangular inner cladding (2) and a circular outer cladding (3) which are sequentially arranged from inside to outside.
2. Rare earth doped fiber with a lyocell triangular core according to claim 1, characterized in that the optical refractive index n of said lyocell triangular core (1)coreWidth b of the core, optical refractive index n of the circular outer cladding (2)cladAnd the laser wavelength λ satisfy the relation:
3. the rare-earth doped lyotropic core fiber as claimed in claim 2, wherein said lyotropic core (1) has a width that is the distance from any vertex of the triangle to the arc of the opposite side.
4. Lyocell triangular core rare-earth doped optical fiber according to claim 1, characterized in that said circular outer cladding (3) is made of pure silica material not doped with any other rare-earth element.
5. The lyotropic triangular-core rare-earth doped optical fiber according to claim 1, wherein said lyotropic triangular-core (1) is made of a silica material doped with rare-earth elements such that the optical refractive index of the lyotropic triangular-core (1) is higher than the optical refractive index of the circular outer cladding (3).
6. The lyotropic triangular-core rare-earth doped optical fiber according to claim 1, wherein said lyotropic triangular inner cladding (2) is made of silica material doped with different types and concentrations of rare-earth elements, such that the optical refractive index of the lyotropic triangular inner cladding (2) is lower than the optical refractive index of the circular outer cladding (3), and the longitudinal acoustic velocity in the lyotropic triangular inner cladding (2) is lower than the longitudinal acoustic velocity in the lyotropic triangular core (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111072141.0A CN113900174A (en) | 2021-09-14 | 2021-09-14 | Rare earth doped optical fiber with Lelo triangular fiber core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111072141.0A CN113900174A (en) | 2021-09-14 | 2021-09-14 | Rare earth doped optical fiber with Lelo triangular fiber core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113900174A true CN113900174A (en) | 2022-01-07 |
Family
ID=79028172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111072141.0A Pending CN113900174A (en) | 2021-09-14 | 2021-09-14 | Rare earth doped optical fiber with Lelo triangular fiber core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113900174A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003227944A (en) * | 2002-02-04 | 2003-08-15 | Mitsubishi Cable Ind Ltd | Doubly clad fiber and method of manufacturing the same |
| CN1584644A (en) * | 2004-06-02 | 2005-02-23 | 中国科学院上海光学精密机械研究所 | beam shaping optical fiber |
| US7130514B1 (en) * | 2005-06-15 | 2006-10-31 | Corning Incorporated | High SBS threshold optical fiber |
| US20070104438A1 (en) * | 2003-06-25 | 2007-05-10 | Spi Lasers Uk Limited | Apparatus for providing optical radiation |
| US20100079854A1 (en) * | 2007-08-28 | 2010-04-01 | Fujikura Ltd. | Rare-earth doped core multi-clad fiber, fiber amplifier, and fiber laser |
| US20150301278A1 (en) * | 2014-04-16 | 2015-10-22 | J-Plasma Gmbh | Preform for an Optical Waveguide and A Fiber with Non-Circular Core |
| CN111751925A (en) * | 2019-03-27 | 2020-10-09 | 华为技术有限公司 | Optical fiber, preparation method thereof, optical fiber amplifier and optical fiber laser |
| CN112368615A (en) * | 2018-07-02 | 2021-02-12 | 住友电气工业株式会社 | Optical fiber |
-
2021
- 2021-09-14 CN CN202111072141.0A patent/CN113900174A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003227944A (en) * | 2002-02-04 | 2003-08-15 | Mitsubishi Cable Ind Ltd | Doubly clad fiber and method of manufacturing the same |
| US20070104438A1 (en) * | 2003-06-25 | 2007-05-10 | Spi Lasers Uk Limited | Apparatus for providing optical radiation |
| CN1584644A (en) * | 2004-06-02 | 2005-02-23 | 中国科学院上海光学精密机械研究所 | beam shaping optical fiber |
| US7130514B1 (en) * | 2005-06-15 | 2006-10-31 | Corning Incorporated | High SBS threshold optical fiber |
| US20100079854A1 (en) * | 2007-08-28 | 2010-04-01 | Fujikura Ltd. | Rare-earth doped core multi-clad fiber, fiber amplifier, and fiber laser |
| US20150301278A1 (en) * | 2014-04-16 | 2015-10-22 | J-Plasma Gmbh | Preform for an Optical Waveguide and A Fiber with Non-Circular Core |
| CN112368615A (en) * | 2018-07-02 | 2021-02-12 | 住友电气工业株式会社 | Optical fiber |
| CN111751925A (en) * | 2019-03-27 | 2020-10-09 | 华为技术有限公司 | Optical fiber, preparation method thereof, optical fiber amplifier and optical fiber laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2003262469B2 (en) | Microstructured optical fiber and optical module | |
| CN106575012A (en) | Hollow-core optical fibers | |
| JP5611328B2 (en) | Filter fiber for use in Raman lasing applications and techniques for manufacturing the same | |
| US8189977B2 (en) | Optical fibers and optical fiber devices with total dispersion greater than material dispersion | |
| CN108181684B (en) | Microstructure hollow optical fiber | |
| JP5643855B2 (en) | High SBS threshold optical fiber | |
| US20100195194A1 (en) | Large Mode Area Optical Fiber | |
| US11493685B2 (en) | Polarization-maintaining hollow-core antiresonant fiber | |
| CN113296186B (en) | Polarization maintaining hollow anti-resonance optical fiber | |
| US20060222307A1 (en) | Optical systems utilizing optical fibers transmitting high power signal and a method of operating such systems | |
| CN113311533B (en) | Anti-resonance hollow optical fiber | |
| CN108761635B (en) | Double-clad ytterbium-doped optical fiber | |
| JP2011513768A (en) | All-solid photonic bandgap fiber | |
| CN104635296A (en) | Long-distance laser energy transmission optical fiber | |
| CN107272110B (en) | A kind of ZBLAN fluoride photonic crystal fiber of super large positive dispersion | |
| CN109994920B (en) | Laser oscillator based on spindle gain fiber with fiber core cladding size continuously gradually changed | |
| CN113031147B (en) | Homogenization optical fiber with multilayer square structure | |
| US20080008432A1 (en) | Waveguide configuration | |
| CN110989072A (en) | Large-mode-field single-mode fiber with multi-cladding spiral structure | |
| CN113900174A (en) | Rare earth doped optical fiber with Lelo triangular fiber core | |
| US9225142B2 (en) | Fiber amplifier with multi section core | |
| CN1971323A (en) | Large mode field double-cladding single-mode optical fiber | |
| CN209961946U (en) | Gain optical fiber with fiber core size longitudinally and continuously graded | |
| CN114035263B (en) | Photonic band gap optical fiber of Lailo triangle low refractive index rod | |
| CN110011171B (en) | Laser oscillator based on fiber core cladding size piecewise graded spindle gain fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |