CN209640528U - Spindle-shaped gain optical fiber with fiber core cladding size being longitudinally and continuously gradually changed - Google Patents
Spindle-shaped gain optical fiber with fiber core cladding size being longitudinally and continuously gradually changed Download PDFInfo
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Abstract
A fusiform gain fiber with a fiber core cladding size being continuously and gradually changed in the longitudinal direction sequentially comprises a fiber core (1-1), an inner cladding (1-2) and an outer cladding (1-3) with refractive indexes being reduced in a gradient manner from inside to outside; the peripheral sizes of the cross sections of the fiber core and the inner cladding are synchronously increased and then decreased along the length direction of the optical fiber, and the peripheral size of the cross section of the outer cladding is constant along the length direction of the optical fiber; the fiber core comprises a fiber core first small-size area (1-4), a fiber core size continuous gradient area (1-5) and a fiber core second small-size area (1-6) which are connected in sequence; the inner cladding comprises a first small-size region (1-7) of the inner cladding, a continuous inner cladding size gradual change region (1-8) and a first small-size region (1-9) of the inner cladding which are sequentially connected, and the gain optical fiber is formed by increasing the cross section peripheral sizes of the fiber core (1-1) and the inner cladding (1-2) along the length direction of the optical fiber and then reducing the cross section peripheral sizes of the fiber core and the inner cladding.
Description
Technical field
The utility model relates generally to technical field of optical fiber, is longitudinally continuous gradually more particularly to a kind of fibre core cladding size
The spindle gain fibre of change.
Background technique
In fields such as optical-fiber laser, Fibre Optical Sensors, gain fibre used at present is generally core size along fiber lengths
Direction uniformly and its cladding size gain fibre invariable along fiber length, such fiber making processes is simple,
Easily batch production, is widely used in related fields.
Currently, the optical fiber that core size that there are two main classes changes along fiber length, one kind are fibre core diameters
Along the optical fiber of fiber length monocycle gradual change, one kind be fibre core diameter along the fiber length multicycle gradually
The optical fiber of change.
Patent " a kind of humidity sensor based on tapered fiber " (CN201320141604), a kind of " bending resistance Qula cone light
Fine and its manufacturing method " (CN201310641596), " a method of in tapered fiber side high effective deposition tungsten sulfide "
(CN201410810484), " a kind of preparation method of chalcogenide glass tapered fiber " (CN201510021302), " one kind drawing
Bore the method that two-dimensional material is deposited on optical fiber " (CN201610423416), " a kind of tapered fiber multi-parameter identification system and its
Method " (CN201611103462), " phase-shifted grating based on tapered fiber and preparation method thereof " (CN201710334994)
Deng, propose the optical fiber of a kind of monocycle gradual change, in the type optical fiber core diameter along fiber length monotonic increase/successively decrease,
Or increase again along monocyclic first reduce of fiber length.
In high power all -fiber oscillator, in order to which suppression mode is unstable, generally require using core diameter and mould field
Area is smaller, the lower gain fibre of normalized frequency inhibits the generation of higher order mode, to improve laser output power；
But the threshold value in order to inhibit nonlinear effect, promote stimulated Raman scattering, it needs larger using core diameter and mode field area
Gain fibre reduce the power density in optical fiber.Therefore, the optical fiber that above-mentioned fibre core covering is monotonically changed is difficult to balance simultaneously
Mode is unstable and the influence of stimulated Raman scattering, and fibre core covering, which first reduces the gain fibre increased afterwards, can make core center
Excessively high power density, easily causes stimulated Raman scattering.The gain fibre of fibre core covering first increases and then decreases can effectively drop
The small diameter area of optical power density in low fibre core, both ends can be good at the generation of control model, be conducive to inhibit simultaneously
Mode is unstable and stimulated Raman scattering.
In view of the above problems, patent CN201810801515) a kind of core size is proposed along fiber length elder generation
Reduce after increase, inner cladding and the surrounding layer size gain fibre invariable along fiber length can reach while press down
The unstable effect with stimulated Raman scattering of molding formula.But the gain fibre in the patent is in the region of Diameter Gradual Change and big straight
Diameter region core packet ratio significantly increases, because of square directly proportional, the core packet of variation of pump absorption coefficient and fiber cores packet ratio
Than so that absorption coefficient measurability, the exploitativeness of gain fibre are poor.Meanwhile core packet can not be with often than the gain fibre of change
The preform of rule comes out, and production process needs make a change in the production of prefabricated rods, and production difficulty is big.
Summary of the invention
It is poor for absorption coefficient measurability, the exploitativeness of above-mentioned gain fibre in the prior art, and produce and make
The high deficiency of technology difficulty, the utility model provide the spindle gain light that a kind of fibre core cladding size is longitudinally continuous gradual change
Fibre has constant core packet ratio along optical fiber direction, and can either realize longitudinally has invariable pumping along gain fibre
Absorption coefficient, while can use common uniform prefabricated rods and being drawn by control drawing speed, it can reduce optical fiber fabrication
Difficulty.
The technical solution of the utility model is that a kind of fibre core cladding size is longitudinally continuous the spindle gain fibre of gradual change,
It includes fibre core, inner cladding and surrounding layer, and the inner cladding wraps fibre core, surrounding layer packet outside inner cladding, the fibre core and
Synchronously first increases and then decreases, the outsourcing in a manner of continuous gradation along fiber length of the Outside Dimensions of inner cladding cross-sectional
The Outside Dimensions of layer cross section are invariable along fiber length；The refractive index of the fibre core is greater than the refractive index of inner cladding,
The refractive index of the inner cladding is greater than the refractive index of surrounding layer, only meets fiber core refractive index greater than inner cladding refractive index, interior packet
Layer refractive index is greater than cladding refractive index, can reach total reflection condition, light could transmit in a fiber.
Further, the peripheral ruler of above-mentioned fibre core and the inner cladding cross section of corresponding position in entire fiber length
It is very little than constant.It can guarantee along the longitudinally constant absorption coefficient of optical fiber and reduce the difficulty of optical fiber fabrication in this way.
Further, the cross section of above-mentioned fibre core is one of circle, regular polygon, ellipse, semicircle but not
It is limited to the shape；The cross section of the inner cladding and the cross section of surrounding layer are round frame, regular polygon frame, oval frame, half
One of circular frame but it is not limited to the shape；The geometric center of fibre core, inner cladding and surrounding layer three cross section is overlapped.It is interior
Covering using polygon can be avoided pump light in communication process there is spiral light and cause absorb weaken.
Also further, above-mentioned fibre core includes sequentially connected the first small size of fibre core region, core size continuous gradation
Region and the second small size of fibre core region；The inner cladding includes sequentially connected the first small size of inner cladding region, inner cladding
Size continuously-graded region and the second small size of inner cladding region；The core size continuously-graded region and inner cladding of the fibre core
Synchronous first become larger along fiber length of cross section Outside Dimensions of inner cladding dimensions continuously-graded region become smaller afterwards.
Further, the cross section of the fibre core is circle, and the cross section of the inner cladding is round frame；The fibre core
Fibre core the first small size region is identical with the diameter of fibre core the second small size zone cross-sectional, invariable along fiber length
And it is not more than 20 microns, the numerical aperture of the two is invariable along fiber length and between 0.03-0.08；In described
Inner cladding the first small size region of covering is identical with the overall diameter of inner cladding the second small size zone cross-sectional, overall diameter edge
Fiber length is invariable and no more than 400 microns, and the numerical aperture of the two is invariable along fiber length to be
0.46。
Also further, the diameter of the core size continuously-graded region of above-mentioned fibre core gradually becomes along fiber length
Change, both ends are at the minimum value of diameter, and central location is at the maximum value of diameter；And the minimum diameter value at both ends be not less than with
The first small size of fibre core region of connection, the second small size of fibre core region diameter value, the maximum of central location is straight
Diameter is not less than 30 microns；The numerical aperture of the core size continuously-graded region it is invariable along fiber length and
Between 0.03-0.08；The cross-sectional outer diameter of the inner cladding dimensions continuously-graded region of the inner cladding is along fiber length
It continuously gradually changes, and the ratio between the inner cladding overall diameter and core diameter keep constant value along fiber length；Interior packet
Layer size continuously-graded region both ends are at overall diameter minimum value, and central location is and the minimum at both ends at overall diameter maximum value
Overall diameter value is not less than the overall diameter in the first small size of the inner cladding region, the second small size of inner cladding region that are attached thereto
The largest outer diameter of value, central location is not less than 600 microns.The size and suitable numerical aperture at the lesser both ends of optical fiber
The zlasing mode that can be excited in optical fiber can be limited less than 2, unstable for mode have good inhibiting effect；In fibre core
The larger diameter in portion can reduce the power density in fibre core, be able to suppress stimulated Raman scattering.
Also further, the diameter of above-mentioned core size continuously-graded region is to connect along the variation pattern of fiber length
It is continuous, it can be convex functionb, spill function, the combination between line shape function three, be no longer the form of piecewise function.
At the same time, in the utility model the variation function of core size continuously-graded region can according to need carry out it is excellent
Change the threshold value that design improves stimulated Raman scattering.According to stimulated Raman scattering typical threshold power budget formula:Wherein AeffFor gain fibre effective area, gRIt is Raman gain, LeffIt is effective length of optical fiber
Degree.LeffThe area being equivalent to below gain fibre internal power genesis analysis curve can be made by the change of parameter
Obtain corresponding variation function when this area minimum.By carrying out numerical simulation, the running parameter of optical fiber along longitudinal direction is set as one
A variable calculates the Raman optical power in the output laser under constant input condition, the result obtained to different running parameters
It is compared, the smallest parameter of the Raman pump power selected can be realized to be set for the optical fiber for improving stimulated Raman scattering threshold value
Meter.
Further, above-mentioned fibre core use Doped ions quartz material, Doped ions be ytterbium ion, thulium ion,
One of erbium ion, holmium ion or a variety of combinations；The inner cladding uses the quartz material of Doped ions；It is described outer
Covering is made of Polyacrylate materials.
The spindle gain fibre that the fibre core cladding size of the utility model is longitudinally continuous gradual change is applied to full optical fiber laser
When in oscillator, fibre core described in preferred design is that cross section is round, fibre core the first small size region and the small ruler of fibre core second
The length 1-10m in very little region, diameter is less than 20 microns, and numerical aperture is between 0.03-0.08；Fibre core large scale region
Length 1-12m, diameter be greater than 30 microns, numerical aperture is between 0.03-0.8；The inner cladding changes with fibre core is synchronous,
The cross section Outside Dimensions ratio of inner cladding and fibre core is kept constant in entire fiber length.Each suitable length energy in region
The practicability of gain fibre is enough greatly increased, often to determine the fiber lengths of needs in practical application according to pumping wavelength,
If large scale region is too long, it is likely to require in application and cuts small size region, if large scale region is shorter, what is needed is small
Size area is too long, is unfavorable for inhibiting stimulated Raman scattering, therefore the length in each region is suitable, can be according to the pumping of application
The conditions such as wavelength determine the length in each region.
The inner cladding dimensions of the gain fibre of the utility model are synchronous with fibre core holding on along fiber length to be become
Change, overall dimensions first increases and then decreases, core packet ratio remains constant.Constant doping concentration, constant core packet ratio, so that increasing
The absorption coefficient of beneficial optical fiber is a steady state value, has preferable parameter measurability and exploitativeness；Meanwhile it can use common equal
Even prefabricated rods are drawn by changing drawing speed, and manufacturing for optical fiber is relatively easy to；Core packet constant simultaneously
Than ensure that the pump absorption coefficient constant along optical fiber axial direction, ensure that preferable parameter measurability and exploitativeness.
Detailed description of the invention
From the detailed description with reference to the accompanying drawing to the utility model embodiment, the utility model these and/or its
Its aspect and advantage will become clearer and be easier to understand, in which:
Fig. 1 is that the fibre core cladding size of the utility model embodiment is longitudinally continuous the spindle gain fibre of gradual change along light
Fine length direction structural schematic diagram；
Fig. 2 is that the fibre core cladding size of the utility model embodiment is longitudinally continuous the spindle gain fibre of gradual change for complete
The structural schematic diagram of fibre laser oscillator.
Specific embodiment
It is right with reference to the accompanying drawings and detailed description in order to make those skilled in the art more fully understand the utility model
The utility model is described in further detail.
Embodiment 1
A kind of spindle gain fibre of fibre core cladding size vertical partition domain gradual change, structural schematic diagram such as Fig. 1 institute
Show, including fibre core 1-1, inner cladding 1-2 and surrounding layer 1-3, inner cladding 1-2 wraps fibre core 1-1, and surrounding layer 1-3 packet wraps inside
Outside layer 1-2, it is integrally formed gain fibre.The cross-sectional shape of fibre core 1-1 be circle, regular polygon, ellipse, it is semicircle in
It is a kind of but be not limited to the shape；The cross-sectional shape of the inner cladding 1-2 and surrounding layer 1-3 is round frame, regular polygon frame, ellipse
One of circular frame, semicircle frame but it is not limited to the shape.Fibre core 1-1, inner cladding 1-2 and surrounding layer 1-3 three are transversal
The geometric center of face shape is overlapped.The fibre core 1-1 and the cross section Outside Dimensions of inner cladding 1-2 are synchronous along fiber length
The cross section Outside Dimensions of first increases and then decreases, the surrounding layer 1-3 are invariable along fiber length；The fibre core 1-1
Refractive index be greater than the refractive index of inner cladding 1-2, the refractive index of the inner cladding 1-2 is greater than the refractive index of surrounding layer 1-3.Its
In, fibre core 1-1 includes that sequentially connected the first small size of fibre core region 1-4, core size transitional region 1-5, fibre core second are small
Size area 1-6, these regions form cross section Outside Dimensions and gradually first become larger along fiber length the fibre core to become smaller afterwards
1-1；Inner cladding 1-2 includes sequentially connected the first small size of inner cladding region 1-7, inner cladding dimensions transitional region 1-8 and interior
Covering the second small size region 1-9, these regions form the inner cladding 1- to become smaller afterwards that gradually first becomes larger along fiber length
2.Inner cladding 1-2 wraps fibre core 1-1, and surrounding layer 1-3 packet forms the ruler of fibre core 1-1 and inner cladding 1-2 outside inner cladding 1-2
It is very little first become larger along fiber length become smaller afterwards and gain fibre.
In the design according to practical application, the cross section of preferred design fibre core 1-1 is that round, inner cladding cross section is
Circle framework, the first small size of fibre core region 1-4 of fibre core 1-1 is identical with the diameter of the second small size of fibre core region 1-6, along light
Fine length direction is constant and no more than 20 microns, and numerical aperture is invariable along fiber length and in 0.03-0.08
Between；The first small size of inner cladding region 1-7 of inner cladding 1-2 is identical with the overall diameter of the second small size of inner cladding region 1-9,
It is invariable along fiber length and be not more than 400 microns, numerical aperture is invariable along fiber length to be
0.46.The diameter of the core size continuously-graded region 1-5 of fibre core 1-1 is gradually changed along fiber length, and both ends are straight
At the minimum value of diameter, central location is at the maximum value of diameter；And the minimum diameter value at both ends is described not less than being attached thereto
The diameter value of the first small size of fibre core region 1-4, the second small size of fibre core region 1-6, the maximum gauge of central location be not small
In 30 microns；The numerical aperture of the core size continuously-graded region 1-5 is invariable along fiber length and in 0.03-
Between 0.08；The cross-sectional outer diameter of the inner cladding dimensions continuously-graded region 1-8 of the inner cladding 1-2 is along fiber length
It continuously gradually changes, and the ratio between the inner cladding overall diameter and core diameter keep constant value along fiber length；Interior packet
The layer size both ends continuously-graded region 1-8 are at overall diameter minimum value, and center is at overall diameter maximum value, and the minimum at both ends is outer
Diameter value is not less than the outer of the first small size of the inner cladding region 1-7, the second small size of inner cladding region 1-9 being attached thereto
The largest outer diameter of diameter value, central location is not less than 600 microns.Fibre core is made of the material of Doped ions, the doping
Ion is one of ytterbium ion, thulium ion, erbium ion, holmium ion or a variety of；The each individual region for including in fibre core 1-1
Numerical aperture is identical, i.e., the numerical aperture phase of everywhere in the first small size of fibre core region and the second small size of fibre core region
It is identical with the numerical aperture of everywhere in, core size transitional region；Certainly, in the first small size of fibre core region and fibre core the
Two small size regions, core size transitional region numerical aperture according to application demand, can also be different.
Wherein the diameter of core size transitional region is continuous along the variation pattern of fiber length, is convex letter
Number, spill function, the combination between line shape function three, are no longer the forms of piecewise function.
The manufacture of optical fiber can use existing optical fiber fabrication technology, first produce the doping prefabricated rods of conventional uniform, In
Drawing speed is controlled in pulling process to control the size of optical fiber everywhere, realizes the optical fiber of size gradation.Drawing gradation zone
When, the change of drawing speed is continuous gradation, and the mode of variation determines the change in size mode of gradation zone.Gain light
Fine absorption coefficient is a steady state value along longitudinal direction, and the measurability of parameter is preferable, and the exploitativeness in practical application is preferable.
Gradation zone, Lai Tigao stimulated Raman scattering threshold value or the unstable threshold value of mode can be optimized before design and manufacture, meet multiplicity
The application demand of change.
Embodiment 2
A kind of spindle gain fibre of fibre core cladding size vertical partition domain gradual change is for full optical fiber laser oscillator
Structural schematic diagram, structure is as shown in Fig. 2, spindle gain fibre including fibre core cladding size vertical partition domain gradual change
1, high reflection fiber grating 2, low light reflectivity fibre grating 3, fiber coupled laser diode 4, pump combiner 5, signal pass energy
Optical fiber 6, pumping energy-transmission optic fibre 7, cladding light stripper 8, end caps 9；Wherein pump combiner 5 includes one or more pumpings
Input arm, a signal output arm；High reflection fiber grating 2, core size longitudinal direction gradual change gain fibre 1, low light reflectivity fibre light
Grid 3 pass sequentially through signal energy-transmission optic fibre 6 and connect and compose optical fiber laser resonant cavity, and fiber coupled laser diode 4 exports laser
The pumping arm of pump combiner 5 is injected by pumping energy-transmission optic fibre 7；The pump light that pump combiner 5 exports passes energy by signal
Optical fiber 6 is injected into optical fiber laser resonant cavity；Resonant cavity exports laser after cladding light stripper 8, is expanded by end caps 9
Output；Core size longitudinal direction gradual change gain fibre 1 therein uses the core diameter longitudinal direction gradual change gain fibre in embodiment 1.
More specifically, fibre core 1-1 is circle, the first small size of fibre core region 1-4, the second small size of the fibre core region 1-6 of fibre core 1-1
Diameter it is identical, it is constant along fiber length and be not more than 20 microns, preferably no greater than 15 microns, numerical aperture is along light
Fine length direction is invariable and between 0.03-0.08, preferably 0.06, length 1-10m；Inner cladding 1-2 is round frame, in
The first small size of covering region 1-7, the overall diameter of the second small size of inner cladding region 1-9 are identical, constant along fiber length
Constant and be not more than 400 microns, it is 0.46 that numerical aperture is invariable along fiber length, length and the small ruler of corresponding fibre core
Very little region is consistent.The diameter of the core size transitional region 1-5 of fibre core 1-1 is gradually changed along fiber length, both ends
Diameter minimum value be not less than the first small size of the fibre core region 1-4 being attached thereto, the second small size of fibre core region 1-6
Diameter value, the diameter maximum value of central location are not less than 30 microns, numerical aperture it is invariable along fiber length and
Between 0.03-0.08, preferably 0.065, length 1-12m；The overall diameter of the inner cladding dimensions transitional region of inner cladding is synchronous
Ground changes with the core size transitional region 1-5, and the overall diameter minimum value at both ends is not less than the interior packet being attached thereto
The overall diameter of the overall diameter value of the first small size region 1-7 of layer, the second small size of inner cladding region 1-9, central location is maximum
Value is greater than 600 microns, and numerical aperture is invariable along fiber length and between 0.03-0.08, and preferably 0.065,
Length is identical as core size transitional region；And the numerical aperture in above-mentioned each individual region is identical, each individual region is adopted
With doping ionic species identical material production, wherein Doped ions are ytterbium ion, thulium ion, erbium ion, one in holmium ion
Kind is a variety of.The first small size of fibre core region 1-4, the second small size of fibre core region 1-6, core size continuous gradation area as a result,
The normalized frequency that the diameter of domain 1-5 and numerical aperture determine is different, wherein the first small size of fibre core region 1-4, fibre core second
For the normalized frequency of small size region 1-6 less than 3.8, the normalized frequency at the both ends core size continuously-graded region 1-5 is not small
In the normalized frequency of the first small size of fibre core region 1-4, the second small size of fibre core region 1-6.
Since the oscillator of the present embodiment has used the core size longitudinal direction gradual change gain fibre in embodiment 1, fibre core
First small size region 1-4, the second small size of fibre core region 1-6 generally support less than 2 fiber modes, are conducive to mode shakiness
Fixed inhibition, core size continuously-graded region diameter and mode field area are larger, the threshold value of stimulated Raman scattering can be improved；It
The inhibition that mode unstable inhibition and stimulated Raman scattering can be combined, it is invariable along fiber lengths to break through core size
Power limit in fibre laser oscillator keeps good light while improving the output power of full optical fiber laser oscillator
Beam quality.
Certainly, in other application, the numerical aperture in each individual region of above-mentioned fibre core 1-1 can be different, are both
The first small size of fibre core region 1-4 in small size region, the diameter of the second small size of fibre core region 1-6 and length can not also
Together, the diameter maximum position of core size continuously-graded region is not necessarily located in region center, generally meets diameter and first becomes larger
Become smaller again.
Optical fiber in this application should guarantee there are enough absorptions to pump light when choosing length, and cannot cause
Excessive resorption generates adverse effect.Fibre core cladding size continuous gradation spindle gain fibre has constant pump absorption system
Number can be easy to choose the length needed as needed.And the manufacture craft of the optical fiber is simple, can reduce oscillator at
This.
Each embodiment of the utility model is described above, above description is exemplary, and non-exclusive, and
And it is also not necessarily limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for
Many modifications and changes are obvious for those skilled in the art.Therefore, the guarantor of the utility model
Shield range should be subject to the protection scope in claims.
Claims (8)
1. a kind of fibre core cladding size is longitudinally continuous the spindle gain fibre of gradual change, it includes fibre core (1-1), inner cladding (1-
2) and surrounding layer (1-3), the inner cladding (1-2) wraps fibre core (1-1), surrounding layer (1-3) packet inner cladding (1-2) outside,
It is characterized in that,
The Outside Dimensions of the fibre core (1-1) and the cross section inner cladding (1-2) are synchronously along fiber length with continuous gradation
The Outside Dimensions of mode first increases and then decreases, surrounding layer (1-3) cross section are invariable along fiber length；The fibre
The refractive index of core (1-1) is greater than the refractive index of inner cladding (1-2), and the refractive index of the inner cladding (1-2) is greater than surrounding layer (1-3)
Refractive index.
2. the spindle gain fibre that fibre core cladding size as described in claim 1 is longitudinally continuous gradual change, which is characterized in that institute
The Outside Dimensions of fibre core (1-1) and inner cladding (1-2) cross section of corresponding position in entire fiber length are stated than constant.
3. the spindle gain fibre that fibre core cladding size as claimed in claim 2 is longitudinally continuous gradual change, which is characterized in that institute
The cross section for stating fibre core (1-1) is one of circle, regular polygon, ellipse, semicircle but is not limited to the shape；It is described
The cross section of inner cladding (1-2) and the cross section of surrounding layer (1-3) be round frame, regular polygon frame, oval frame, in semicircle frame
One kind but be not limited to the shape；The geometric center of fibre core (1-1), inner cladding (1-2) and surrounding layer (1-3) three cross section
It is overlapped.
4. the spindle gain fibre that fibre core cladding size as claimed in claim 3 is longitudinally continuous gradual change, which is characterized in that
The fibre core (1-1) includes sequentially connected the first small size of fibre core region (1-4), core size continuously-graded region
(1-5) and the second small size of fibre core region (1-6)；
The inner cladding (1-2) includes sequentially connected the first small size of inner cladding region (1-7), inner cladding dimensions continuous gradation
Region (1-8) and the second small size of inner cladding region (1-9)；
The core size continuously-graded region (1-5) of the fibre core (1-1) and the inner cladding dimensions continuous gradation of inner cladding (1-2)
The cross section Outside Dimensions in region (1-8) synchronously first become larger along fiber length to become smaller afterwards.
5. the spindle gain fibre that fibre core cladding size as claimed in claim 4 is longitudinally continuous gradual change, which is characterized in that
The cross section of the fibre core (1-1) is circle, and the cross section of the inner cladding (1-2) is round frame；The fibre core (1-1)
The first small size of fibre core region (1-4) is identical with the diameter of the cross section the second small size of fibre core region (1-6), along fiber lengths side
To it is invariable and be not more than 20 microns, the numerical aperture of the two is invariable along fiber length and in 0.03-0.08
Between；
The first small size of the inner cladding region (1-7) and the second small size of inner cladding region (1-9) of the inner cladding (1-2) are transversal
The overall diameter in face is identical, and overall diameter is invariable along fiber length and no more than 400 microns, and the numerical aperture of the two is equal
Invariable along fiber length is 0.46.
6. the spindle gain fibre that fibre core cladding size as claimed in claim 5 is longitudinally continuous gradual change, which is characterized in that
The diameter of the core size continuously-graded region (1-5) of the fibre core (1-1) is gradually changed along fiber length, and two
End is at the minimum value of diameter, and central location is at the maximum value of diameter；And the minimum diameter value at both ends is not less than being attached thereto
The first small size of fibre core region (1-4), the second small size of fibre core region (1-6) diameter value, central location is most
Major diameter is not less than 30 microns；The numerical aperture of the core size continuously-graded region (1-5) is constant along fiber length
It is constant and between 0.03-0.08；
The cross-sectional outer diameter of the inner cladding dimensions continuously-graded region (1-8) of the inner cladding (1-2) is along fiber length
It continuously gradually changes, and the ratio between the inner cladding overall diameter and core diameter keep constant value along fiber length；Interior packet
The layer size continuously-graded region both ends (1-8) are at overall diameter minimum value, and center is and the minimum at both ends at overall diameter maximum value
Overall diameter value is not less than the first small size of the inner cladding region (1-7) being attached thereto, the second small size of inner cladding region (1-
9) largest outer diameter of overall diameter value, central location is not less than 600 microns.
7. the spindle gain fibre that fibre core cladding size as claimed in claim 6 is longitudinally continuous gradual change, which is characterized in that fine
The diameter of core size continuously-graded region (1-5) is continuous along the variation pattern of fiber length, is convex functionb, spill letter
Combination between number, line shape function three.
8. the spindle gain fibre that fibre core cladding size as described in claim 1 is longitudinally continuous gradual change, which is characterized in that institute
State the quartz material that fibre core (1-1) uses Doped ions, Doped ions be ytterbium ion, thulium ion, erbium ion, in holmium ion
One or more combinations；The inner cladding (1-2) uses the quartz material of Doped ions；The surrounding layer (1-3)
It is made of Polyacrylate materials.
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| CN110007393A (en) * | 2019-05-09 | 2019-07-12 | 中国人民解放军国防科技大学 | Spindle-shaped gain optical fiber with fiber core cladding size being longitudinally and continuously gradually changed |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007393A (en) * | 2019-05-09 | 2019-07-12 | 中国人民解放军国防科技大学 | Spindle-shaped gain optical fiber with fiber core cladding size being longitudinally and continuously gradually changed |
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