CN117270201B - Inner cladding adjusting system based on double-cladding optical fiber - Google Patents
Inner cladding adjusting system based on double-cladding optical fiber Download PDFInfo
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- 238000005253 cladding Methods 0.000 title claims abstract description 141
- 239000013307 optical fiber Substances 0.000 title claims abstract description 43
- 239000000835 fiber Substances 0.000 claims abstract description 63
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- 230000001276 controlling effect Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- 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
Abstract
The invention relates to the technical field of optics, in particular to an inner cladding adjusting system based on double-cladding optical fibers, which comprises the following steps when a computer program is executed by a processor: obtaining shape parameters of an inner cladding layer in the double-cladding optical fiber to be adjusted according to the first radius of the outer cladding layer, the second radius of the fiber core and the data table, obtaining a candidate shape parameter set by combining the adjustment times and the parameter adjustment step length, obtaining corresponding first control beam power by combining the simulator, and determining the corresponding candidate shape parameter set as a target shape parameter set when the power loss between the first control beam power and the target control beam power is not greater than a power loss threshold value, so as to obtain the target double-cladding optical fiber. The shape parameters are searched in the data table to complete the selection of the shape of the inner cladding, and the shape parameters are sequentially adjusted to obtain a target shape parameter set, so that the adjustment of the size of the inner cladding is completed, and the optical signal output from the fiber core can meet the requirement of target control of the power of the light beam.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an inner cladding adjusting system based on double-cladding optical fibers.
Background
The optical power output by the fiber core in the double-clad fiber is controlled, so that the application scene of the double-clad fiber can be expanded. The traditional double-clad fiber utilizes proper materials and designs to enable the cladding part of the fiber to have two refractive indexes of a step structure, for the generated laser wavelength, the inner cladding and the fiber core form a single-mode optical waveguide, and the inner cladding and the outer cladding form a multi-mode optical waveguide, so that the inner cladding with larger diameter can better couple and transmit pump light, and the pump light is absorbed through the fiber core for multiple times in the transmission process, thereby improving the absorption efficiency and further controlling the output power of signal light.
However, when the shape of the inner cladding in the double-clad fiber is circular, the overlapping degree between the propagation mode of the inner cladding and the signal fiber core is small, and the power control degree of the pump light on the signal light in the fiber core is limited, so that the optical signal output in the fiber core is difficult to meet the high-power requirement.
Therefore, how to adjust the shape of the inner cladding, so that the optical signal output in the fiber core can meet the high power requirement is a problem to be solved.
Disclosure of Invention
Aiming at the technical problems, the invention adopts the technical scheme that the inner cladding adjusting system based on the double-clad optical fiber comprises an emulator, a first light source, the double-clad optical fiber GX to be adjusted, a processor and a memory storing a computer program, wherein the GX comprises an inner cladding, an outer cladding and a fiber core, the emulator is used for outputting corresponding control beam power according to the outer cladding radius, the fiber core radius and the inner cladding shape parameter corresponding to the double-clad optical fiber, and the memory also stores a first radius R of the outer cladding in the GX 1 Second radius R of core in GX 2 Preset data table y= { Y 1 ，Y 2 ，……，Y i ，……，Y N }；
Wherein, the ith group of data Y in Y i ={R 1 i ，R 2 i ，C i }，R 1 i Refers to an ith preset double-clad optical fiber SX i First radius of middle-outer cladding, R 2 i Refers to SX i Second radius of middle fiber core, SX i Shape parameter C of inner and middle cladding i ={C i1 ，C i2 ，……，C ij ，……，C iE(i) }，C ij Refers to SX i The j-th corresponding shape parameter, i=1, 2, … …, N refers to the total number of preset double-clad fibers, j=1, 2, … …, E (i) refers to SX i The total number of corresponding inner cladding shape parameters;
when the computer program is executed by a processor, the following steps are implemented:
s1, when R 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ "where k is {1,2, … …, N}，C ka A=1, 2, … …, ζ, total number of shape parameters corresponding to the inner cladding in GX, and ζ=e (k).
S2, initializing C k The corresponding number of adjustments p=1.
S3, according to p, C k And a preset parameter adjustment step length step, obtaining a t candidate shape parameter set D of the inner cladding in GX k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t }, wherein D ka t Refers to the a-th shape parameter in the t-th candidate shape parameter set, t=p, D ka t Meets the following conditions:
D ka t =C ka +t×step。
s4, according to D k t 、R 1 And R is 2 D is obtained in the simulator k t Corresponding first control beam power Z 1t 。
S5, according to Z 1t And a preset target control beam power G 0 Obtain D k t Corresponding power loss L t ，L t Meets the following conditions:
L t =|Z 1t -G 0 |。
s6, if L t ＞L 0 Updating p=p+1, returning to execution S3 to S5 until L t ≤L 0 Wherein L is 0 Refers to a preset power loss threshold.
S7, L t The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 。
S8, according to R 1 、R 2 And D 0 And obtaining the adjusted target double-clad optical fiber.
Compared with the prior art, the optical fiber beam combination control system has obvious beneficial effects, can achieve quite technical progress and practicality and has industrial applicability by virtue of the technical schemeThe method has wide application value and at least has the following beneficial effects: when R is 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ Initializing C k The corresponding adjustment times p=1, according to p, C k And a preset parameter adjustment step length step, obtaining a t candidate shape parameter set D of the inner cladding in GX k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t According to D } k t 、R 1 And R is 2 D is obtained in the simulator k t Corresponding first control beam power Z 1t According to Z 1t And a preset target control beam power G 0 Obtain D k t Corresponding power loss L t If L t ＞L 0 Updating p=p+1, returning to execution S3 to S5 until L t ≤L 0 Will L t The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 According to R 1 、R 2 And D 0 And obtaining the adjusted target double-clad optical fiber. The shape parameter C corresponding to the inner cladding in GX is obtained by searching in Y k The selection of the shape of the inner cladding is completed, and the comparison between the first control beam power and the target control beam power is used for C k The gradual adjustment is carried out to obtain a target shape parameter set, so that the acquisition efficiency and accuracy of the target shape parameter are improved, and the optical signals output in the corresponding fiber cores can meet the high-power requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating steps implemented when a processor of an inner cladding adjusting system based on a double-clad fiber executes a computer program according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first embodiment provides an inner cladding adjusting system based on a double-clad optical fiber, the system comprising an emulator, a first light source, a double-clad optical fiber to be adjusted GX, a processor and a memory storing a computer program, wherein the GX comprises an inner cladding, an outer cladding and a fiber core, the emulator is used for outputting corresponding control beam power according to the corresponding outer cladding radius, fiber core radius and inner cladding shape parameters of the double-clad optical fiber, and the memory also stores a first radius R of the outer cladding in the GX 1 Second radius R of core in GX 2 Preset data table y= { Y 1 ，Y 2 ，……，Y i ，……，Y N }；
Wherein, the ith group of data Y in Y i ={R 1 i ，R 2 i ，C i }，R 1 i Refers to an ith preset double-clad optical fiber SX i First radius of middle-outer cladding, R 2 i Refers to SX i Second radius of middle fiber core, SX i Shape parameter C of inner and middle cladding i ={C i1 ，C i2 ，……，C ij ，……，C iE(i) }，C ij Refers to SX i The j-th corresponding shape parameter, i=1, 2, … …, N refers to the total number of preset double-clad fibers, j=1, 2, … …, E (i) refers to SX i The total number of corresponding inner cladding shape parameters;
when the computer program is executed by the processor, the following steps are implemented, as shown in fig. 1:
s1, when R 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ "where k.epsilon. {1,2, … …, N }, C } ka A=1, 2, … …, ζ, total number of shape parameters corresponding to the inner cladding in GX, and ζ=e (k).
The double-clad optical fiber GX to be regulated comprises an inner cladding, an outer cladding and a fiber core, wherein the inner cladding and the fiber core form a single-mode optical waveguide, and the inner cladding and the outer cladding form a multi-mode optical waveguide, so that the inner cladding with larger diameter can better couple and transmit pump light, and the pump light passes through the fiber core for multiple times in the transmission process and is absorbed, thereby controlling the power of signal light output in the fiber core.
When the shape of the inner cladding in the double-clad optical fiber is circular, the overlapping degree between the propagation mode of the inner cladding and the signal optical fiber core is small, and the power control degree of the pumping light on the signal light in the optical fiber core is limited, so that the optical signal output in the optical fiber core is difficult to meet the high-power requirement. Therefore, the embodiment selects the shape of the inner cladding and adjusts the size of the selected shape of the inner cladding, so that the optical signal output in the fiber core can meet the requirement of high power.
Specifically, the outer cladding and the core are both circular in configuration, and therefore the database includes a first radius R of the outer cladding in the double-clad fiber to be tuned 1 And a second radius R of the core 2 As a basis for the dimensions of the double-clad optical fiber to be tuned.
The preset data table Y is a data table concerning the first radius of the outer cladding, the second radius of the core and the shape parameters of the inner cladding of the double-clad optical fiber, in particular, y= { Y 1 ，Y 2 ，……，Y i ，……，Y N I-th group data Y i ={R 1 i ，R 2 i ，C i }，R 1 i Refers to an ith preset double-clad optical fiber SX i First radius of middle-outer cladding, R 2 i Refers to SX i Second radius of middle fiber core, SX i Shape parameter C of inner and middle cladding i ={C i1 ，C i2 ，……，C ij ，……，C iE(i) }，C ij Refers to SX i A corresponding j-th shape parameter.
The shape of the inner cladding may be set by an embodiment according to the actual situation, in this embodiment, the shape of the inner cladding may be D-shape, rectangular shape, regular hexagon, oval shape, triangle shape, etc., correspondingly, the shape parameter corresponding to the D-shape inner cladding may be radius and line segment length, the shape parameter corresponding to the rectangular inner cladding may be length and width, the shape parameter corresponding to the oval inner cladding may be short axis length and long axis length, and the shape parameter corresponding to the triangle inner cladding may be first side length, second side length and third side length.
Specifically, when R 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ And, where k e is {1,2, … …, N }, C k ∈Y，C ka Refers to the a-th shape parameter corresponding to the inner cladding in GX.
The embodiment is based on R 1 And R is 2 Searching in Y to obtain the shape parameter C of the inner cladding in GX k The shape of the inner cladding is selected, and C is obtained k As an object of adjusting the size of the inner cladding shape, a basis is provided for controlling the optical signal output in the fiber core to meet the target control beam power requirement.
In a specific embodiment, the memory further stores a preset radius set r= { R of the double-clad optical fiber 0 1 ，R 0 2 ，……，R 0 i ，……，R 0 N An ith preset double-clad optical fiber SX i Radius list R of (2) 0 i ={R 1 i ，R 2 i When the computer program is executed by a processor, the following steps are also implemented:
s01, obtaining a shape parameter set x= { x according to a preset inner cladding area S 1 ，x 2 ，……，x h ，……，x U X, where x h Refers to the shape parameter of the h-th type inner cladding, h=1, 2, … …, U, U refers to the type number of the inner cladding, x h Meets the following conditions:
x h =F h (S), wherein F h () Refers to a function between the shape parameter of the h-th type inner cladding and the inner cladding area;
s02, obtaining a second control beam power list set Z in the simulator according to x and R 2 ={Z 21 ，Z 22 ，……，Z 2i ，……，Z 2N (wherein R is 0 i Corresponding second control beam power list Z 2i ={Z 2i1 ，Z 2i2 ，……，Z 2ih ，……，Z 2iU }，Z 2ih Refers to R 0 i And x h A corresponding second control beam power;
s03 according to Z 2 And x obtains a shape parameter set c= { C 1 ，C 2 ，……，C i ，……，C N }, wherein C i Refers to max (Z) 2i ) Corresponding shape parameters, C i ∈x；
S04, acquiring a preset data table Y= { Y according to R and C 1 ，Y 2 ，……，Y i ，……，Y N }, wherein the ith group of data Y i ={R 1 i ，R 2 i ，C i }。
Wherein, in order to determine R 1 i And R is 2 i Correspondingly, the optical signal output from the fiber core can meet the optimal inner cladding shape of high power requirement, and the embodiment takes the preset inner cladding area S as a reference to obtain the corresponding shape parameter set x when the h-th inner cladding area is equal to S h Further according to the h-class inner cladding and x h Obtain Z 2ih For characterising the h-th inner cladding at R 1 i And R is 2 i On the basis of which whether the optical signal output by the fiber core can meet the requirement of target control beam power is controlled.
Further traversing h=1, 2, … …, U, R can be obtained i Corresponding second control beam power list set Z 2i ={Z 2i1 ，Z 2i2 ，……，Z 2ih ，……，Z 2iU Max (Z) 2i ) The corresponding shape parameter of the inner cladding is R 1 i And R is 2 i On the basis of which the optical signal output from the core can meet the requirements of the target control beam power, thereby obtaining the ith group data Y i ={R 1 i ，R 2 i ，C i }。
Further traversing i=1, 2, … …, N, a preset data table y= { Y can be obtained 1 ，Y 2 ，……，Y i ，……，Y N And the method is used as a basis for judging the shape parameters corresponding to the inner cladding in GX.
According to the embodiment, the preset inner cladding area S is taken as a reference, the corresponding shape parameter set when the area of each type of inner cladding is equal to S is obtained, the second control beam power corresponding to each group of first radius, second radius and shape parameter set is obtained in the simulator, the control effect of the corresponding inner cladding and the shape parameters thereof on the signal light on the basis of the first radius and the second radius is represented, the shape parameters of the inner cladding which are optimal in high-power requirements can be met by the optical signals output in the fiber core on the basis of the first radius and the second radius are determined, a preset data table Y is obtained by combining the first radius and the second radius, a basis is provided for judging the shape parameters corresponding to the inner cladding in GX, and the optical signals output in the fiber core are further controlled to meet the requirements of target control beam power.
In one embodiment, pi (R 2 ) 2 ＜S＜π(R 1 ) 2 。
Wherein S characterizes the area of the inner cladding, and thus the area S of the inner cladding is greater than the area pi (R 2 ) 2 And is smaller than the area pi (R 1 ) 2 。
In one embodiment, R 2 ＜C ka ＜R 1 。
Wherein C is ka Characterized by shape parameters of the inner cladding, such as radius, length, width, short axis length, long axis length, first side length, second side length, and third side length, and so on, R 2 ＜C ka ＜R 1 。
S2, initializing C k The corresponding number of adjustments p=1.
After the shape parameters of the inner cladding are determined, the shape parameters are further adjusted to obtain the optimal target shape parameters of the optical signals output from the fiber cores, wherein the optimal target shape parameters can meet the high-power requirement.
In this embodiment, the number of times p=1 of adjustment of the shape parameter is set first, and the shape parameter is adjusted for the first time, so as to determine whether to continue adjustment according to a comparison result between the control beam power output after the first adjustment and the target control beam power, and stop adjustment when the control beam power output after the adjustment meets the target control beam power condition, so as to obtain a target shape parameter set, thereby improving the acquisition efficiency of the target shape parameter.
S3, according to p, C k And a preset parameter adjustment step length step, obtaining a t candidate shape parameter set D of the inner cladding in GX k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t }, wherein D ka t Refers to the a-th shape parameter in the t-th candidate shape parameter set, t=p, D ka t Meets the following conditions:
D ka t =C ka +t×step。
the preset step length is used for controlling the degree of adjusting the shape parameters each time, if step is too large, the accuracy and precision of the target shape parameter set are affected, and if step is too small, the calculated amount in the process of obtaining the target shape parameter set is increased, so that the specific value of step can be set by an implementer according to actual conditions.
On a step basis, for C ka The (a) th shape parameter D in the (t) th candidate shape parameter set can be obtained when the (p) th adjustment is performed ka t =C ka +t×step, where t=p, further traversing a=1, 2, … …, ζ, the t-th candidate shape parameter set D can be obtained k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t }。
In one embodiment, R 2 ＜D ka t ＜R 1 。
Wherein D is ka t Characterized by the shape parameters of the inner cladding, therefore, R 2 ＜D ka t ＜R 1 。
S4, according to D k t 、R 1 And R is 2 D is obtained in the simulator k t Corresponding first control beam power Z 1t 。
The simulator can simulate the corresponding double-clad optical fiber according to the input shape parameters of the inner cladding, the first radius of the outer cladding and the second radius of the fiber core, control the power of the signal light according to the signal light transmitted in the fiber core and the signal light input into the inner cladding by the pumping light source, and output the corresponding control light beam power.
Thus, the present embodiment is according to D k t Determining corresponding inner cladding in the simulator, and combining corresponding R 1 Outer cladding of (2) and corresponding R 2 The corresponding double-clad optical fiber is obtained from the fiber core, and then the signal light G transmitted in the corresponding fiber core is used for 1 And the pumping light source transmits the signal light G into the corresponding inner cladding 2 Obtain D k t Corresponding first control beam power Z 1t For characterising D k t At R 1 And R is 2 The optical signal output from the basic fiber core can meet the requirement of target control beam power, and is used as the basis for judging the target shape parameter set.
In one embodiment, S4 specifically includes the following steps:
s41, D k t As the shape parameter of the inner cladding in the double-cladding optical fiber to be simulated;
s42, R is 1 As the first radius of the outer cladding in the double-clad fiber to be simulated;
s43, R is 2 As a second radius of the core in the double-clad fiber to be simulated;
s44, obtaining simulated double-clad optical fibers in the simulator;
s45, presetting a first signal light G 1 As the signal light transmitted by the fiber core in the simulated double-clad fiber;
s46, presetting a second signal light G 2 As the signal light transmitted in the inner cladding of the simulated double-clad fiber;
s47, outputting D from the simulator k t Corresponding first control beam power Z 1t 。
The embodiment is according to D k t Signal light G transmitted in corresponding fiber core 1 And a signal transmitted from the pump light source into the corresponding inner claddingNumber G light 2 Acquiring a first control beam power Z 1t As a basis for determining whether the optical signal output in the core meets the target control beam power requirement.
S5, according to Z 1t And a preset target control beam power G 0 Obtain D k t Corresponding power loss L t ，L t Meets the following conditions:
L t =|Z 1t -G 0 |。
wherein G is 0 Refers to preset target control beam power according to Z 1t And G 0 Obtain D k t Corresponding power loss L t =|Z 1t -G 0 I, can evaluate Z 1t And G 0 The difference between them to characterize D k t At R 1 And R is 2 On the basis of the above, whether the optical signal output from the fiber core can meet the requirement of target control beam power or not is used as a basis for judging the target shape parameter set.
S6, if L t ＞L 0 Updating p=p+1, returning to execution S3 to S5 until L t ≤L 0 Wherein L is 0 Refers to a preset power loss threshold.
Wherein, if L t ＞L 0 Then represent D k t At R 1 And R is 2 The optical signal output in the core on the basis of (1) does not meet the target control beam power requirement, and therefore, p=p+1 is updated, S3 to S5 are performed back, and the shape parameters are adjusted again on the basis of step until L t ≤L 0 So that D k t At R 1 And R is 2 The optical signal output in the fiber core can meet the requirement of target control beam power.
In one embodiment, L 0 =βG 0 Wherein, beta refers to a preset threshold adjustment parameter.
Wherein L is 0 Refers to a preset power loss threshold value for judging D k t At R 1 And R is 2 On the basis of whether the optical signal output from the fiber core can satisfyThe target control beam power requirement provides a basis for obtaining a target shape parameter set.
In one embodiment, β=0.1.
Wherein, β refers to a preset threshold adjustment parameter, if β is too large, it affects the accuracy and precision of the target shape parameter set, and if β is too small, it increases the calculation amount in the process of obtaining the target shape parameter set, so that the specific value of β can be set by the practitioner according to the actual situation.
S7, L t The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 。
Wherein, when L t ≤L 0 At time D k t At R 1 And R is 2 On the basis of the optical signal output from the fiber core meeting the requirement of target control beam power, therefore, L t ≤L 0 The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 So that the optical signal output in the fiber core can meet the requirement of target control beam power.
S8, according to R 1 、R 2 And D 0 And obtaining the adjusted target double-clad optical fiber.
Wherein according to R 1 、R 2 And D 0 And acquiring the adjusted target double-clad optical fiber, and performing power control on the signal light on the basis of the pumping light source to obtain a light beam meeting the power requirement of the target control light beam.
In this embodiment R 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ Initializing C k The corresponding adjustment times p=1, according to p, C k And a preset parameter adjustment step length step, obtaining a t candidate shape parameter set D of the inner cladding in GX k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t According to D } k t 、R 1 And R is 2 D is obtained in the simulator k t Corresponding first control beam power Z 1t According to Z 1t And a preset target control beam power G 0 Obtain D k t Corresponding power loss L t If L t ＞L 0 Updating p=p+1, returning to execution S3 to S5 until L t ≤L 0 Will L t The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 According to R 1 、R 2 And D 0 And obtaining the adjusted target double-clad optical fiber. The shape parameter C corresponding to the inner cladding in GX is obtained by searching in Y k The selection of the shape of the inner cladding is completed, and the comparison between the first control beam power and the target control beam power is used for C k The gradual adjustment is carried out to obtain a target shape parameter set, so that the acquisition efficiency and accuracy of the target shape parameter are improved, and the optical signals output in the corresponding fiber cores can meet the high-power requirement.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will also appreciate that many modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. An inner cladding adjusting system based on double-clad optical fibers is characterized in that the system comprises an emulator, a first light source, the double-clad optical fibers to be adjusted GX, a processor and a memory storing a computer program, wherein the GX comprises an inner cladding, an outer cladding and a fiber core, the emulator is used for outputting corresponding control light beam power according to the outer cladding radius, the fiber core radius and the inner cladding shape parameters corresponding to the double-clad optical fibers, and the memory also stores a first radius R of the outer cladding in the GX 1 Second radius R of core in GX 2 Preset, presetData table y= { Y 1 ，Y 2 ，……，Y i ，……，Y N }；
Wherein, the ith group of data Y in Y i ={R 1 i ，R 2 i ，C i }，R 1 i Refers to an ith preset double-clad optical fiber SX i First radius of middle-outer cladding, R 2 i Refers to SX i Second radius of middle fiber core, SX i Shape parameter C of inner and middle cladding i ={C i1 ，C i2 ，……，C ij ，……，C iE(i) }，C ij Refers to SX i The j-th corresponding shape parameter, i=1, 2, … …, N refers to the total number of preset double-clad fibers, j=1, 2, … …, E (i) refers to SX i The total number of corresponding inner cladding shape parameters;
when the computer program is executed by a processor, the following steps are implemented:
s1, when R 1 =R 1 k And R is 2 =R 2 k In the process, the shape parameter C corresponding to the inner cladding in GX is obtained from Y k ={C k1 ，C k2 ，……，C ka ，……，C kζ "where k.epsilon. {1,2, … …, N }, C } ka A=1, 2, … …, ζ, ζ is the total number of shape parameters corresponding to the inner cladding in GX and ζ=e (k);
s2, initializing C k The corresponding adjustment times p=1;
s3, according to p, C k And a preset parameter adjustment step length step, obtaining a t candidate shape parameter set D of the inner cladding in GX k t ={D k1 t ，D k2 t ，……，D ka t ，……，D kζ t }, wherein D ka t Refers to the a-th shape parameter in the t-th candidate shape parameter set, t=p, D ka t Meets the following conditions:
D ka t =C ka +t×step；
s4, according to D k t 、R 1 And R is 2 D is acquired in the simulator k t Corresponding first control beam power Z 1t ；
S5, according to Z 1t And a preset target control beam power G 0 Obtain D k t Corresponding power loss L t ，L t Meets the following conditions:
L t =|Z 1t -G 0 |；
s6, if L t ＞L 0 Updating p=p+1, returning to execution S3 to S5 until L t ≤L 0 Wherein L is 0 Refers to a preset power loss threshold;
s7, L t The corresponding candidate shape parameter set is determined as the target shape parameter set D of the inner cladding in GX 0 ；
S8, according to R 1 、R 2 And D 0 And obtaining the adjusted target double-clad optical fiber.
2. The system of claim 1, wherein the memory further stores a preset radius set r= { R of the double-clad optical fiber 0 1 ，R 0 2 ，……，R 0 i ，……，R 0 N An ith preset double-clad optical fiber SX i Radius list R of (2) 0 i ={R 1 i ，R 2 i When the computer program is executed by a processor, the following steps are also implemented:
s01, obtaining a shape parameter set x= { x according to a preset inner cladding area S 1 ，x 2 ，……，x h ，……，x U X, where x h Refers to the shape parameter of the h-th type inner cladding, h=1, 2, … …, U, U refers to the type number of the inner cladding, x h Meets the following conditions:
x h =F h (S), wherein F h () Refers to a function between the shape parameter of the h-th type inner cladding and the inner cladding area;
s02, obtaining a second control beam power list set Z in the simulator according to x and R 2 ={Z 21 ，Z 22 ，……，Z 2i ，……，Z 2N (wherein R is 0 i Corresponding second control beam power list Z 2i ={Z 2i1 ，Z 2i2 ，……，Z 2ih ，……，Z 2iU }，Z 2ih Refers to R 0 i And x h A corresponding second control beam power;
s03 according to Z 2 And x obtains a shape parameter set c= { C 1 ，C 2 ，……，C i ，……，C N }, wherein C i Refers to max (Z) 2i ) Corresponding shape parameters, C i ∈x；
S04, acquiring a preset data table Y= { Y according to R and C 1 ，Y 2 ，……，Y i ，……，Y N }, wherein the ith group of data Y i ={R 1 i ，R 2 i ，C i }。
3. The system of claim 2, wherein pi (R 2 ) 2 ＜S＜π(R 1 ) 2 。
4. The system according to claim 1, wherein S4 comprises the steps of:
s41, D k t As the shape parameter of the inner cladding in the double-cladding optical fiber to be simulated;
s42, R is 1 As the first radius of the outer cladding in the double-clad fiber to be simulated;
s43, R is 2 As a second radius of the core in the double-clad fiber to be simulated;
s44, obtaining the simulated double-clad optical fiber in the simulator;
s45, presetting a first signal light G 1 As the signal light transmitted by the fiber core in the simulated double-clad fiber;
s46, presetting a second signal light G 2 As the signal light transmitted in the inner cladding in the simulated double-clad fiber;
s47, outputting D from the simulator k t Corresponding first control beam power Z 1t 。
5. The system of claim 1, wherein R 2 ＜C ka ＜R 1 。
6. The system of claim 1, wherein R 2 ＜D ka t ＜R 1 。
7. The system of claim 1, wherein L 0 =βG 0 Wherein, beta refers to a preset threshold adjustment parameter.
8. The system of claim 7, wherein β = 0.1.
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