CN114804617B - Drawing method of photonic crystal fiber and photonic crystal fiber - Google Patents
Drawing method of photonic crystal fiber and photonic crystal fiber Download PDFInfo
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- CN114804617B CN114804617B CN202110128936.2A CN202110128936A CN114804617B CN 114804617 B CN114804617 B CN 114804617B CN 202110128936 A CN202110128936 A CN 202110128936A CN 114804617 B CN114804617 B CN 114804617B
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- 239000000835 fiber Substances 0.000 title claims abstract description 117
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 12
- 239000003365 glass fiber Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/0279—Photonic crystal fibres or microstructured optical fibres other than holey optical fibres
Abstract
The invention provides a drawing method of a photonic crystal fiber and the photonic crystal fiber, wherein the drawing method of the photonic crystal fiber comprises the following steps: preparing a drawing material according to the structure of the photonic crystal fiber; preparing a preform based on the drawing material, and drawing the preform; preparing an air sleeve based on the drawing material, and drawing the air sleeve; sleeving the drawn air sleeve on the drawn preform rod to obtain an initial photonic crystal fiber; and drawing the initial photonic crystal fiber to obtain the photonic crystal fiber. The invention draws the preformed rod and the air sleeve in stages, and then combines and draws the drawn preformed rod and the drawn air sleeve, so that each technological parameter in the drawing process can be accurately controlled, the stability and the replaceability of PCF in the production process are improved, and simultaneously, the radial uniformity of the drawn PCF is better under the conditions of stable temperature, air pressure and drawing speed.
Description
[ field of technology ]
The invention relates to the technical field of optical fiber drawing, in particular to a drawing method of a photonic crystal fiber and the photonic crystal fiber drawn by the drawing method of the photonic crystal fiber.
[ background Art ]
Photonic crystal fibers (Photonic Crystal Fibers, PCF) are also known as microstructured fibers (Micro-Structured Fibers, MSF), the core of which consists of a solid glass rod or hollow glass tube and the cladding of which consists of regularly distributed air holes. PCF has more excellent characteristics than the traditional optical fiber in the gain optical fiber field, specifically, the microporous structure of PCF introduces air, so that the equivalent refractive index of the cladding is smaller than that of the fiber core, and the refractive index difference between the cladding and the fiber core can be accurately controlled by regulating and controlling the aperture and the hole spacing of the microporous structure; PCF can realize the non-cut-off single-mode transmission characteristic based on large-mode field area, has better heat dissipation performance than the traditional optical fiber, and obviously reduces the influence of nonlinear effect in high-power laser transmission. Based on this, PCF has been widely used in fields such as ultrafast lasers.
In the prior art, the PCF is drawn more complicated than the traditional optical fiber, and the most commonly used drawing method at present is a stacking method, namely, after small glass tubes and small glass rods with the same size are stacked into a certain geometric shape (such as a regular hexagon), the PCF is drawn at one time at a high temperature by controlling the gas pressure in the small glass tubes in the prefabricated rod. However, since the cross section of the PCF introduces micro-sized air holes, some air holes are easily collapsed or deformed during the drawing process, so that the microporous structure of the PCF is damaged, which is specifically shown by uneven air hole sizes, insufficient circles in shapes, different d/Λ values or deviations from target values (d is the diameter of the air holes, Λ is the distance between the air holes), so that the stability and replaceability of the PCF during the production process are reduced, and particularly, the difficulty is greater when the diameters of a plurality of air holes with different sizes in the same optical fiber are controlled.
Therefore, there is a need for an improvement in the PCF drawing process.
[ invention ]
The technical problems to be solved by the invention are as follows: the method for drawing the photonic crystal fiber and the photonic crystal fiber are provided, and the problems of insufficient stability and replaceability of PCF in the production process in the prior art are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
an embodiment of the present invention provides a method for drawing a photonic crystal fiber, including:
preparing a drawing material according to the structure of the photonic crystal fiber;
preparing a preform based on the drawing material, and drawing the preform;
preparing an air sleeve based on the drawing material, and drawing the air sleeve;
sleeving the drawn air sleeve on the drawn preform rod to obtain an initial photonic crystal fiber;
and drawing the initial photonic crystal fiber to obtain the photonic crystal fiber.
In some embodiments, the drawn material comprises: glass fiber, capillary, preform core and first outer sleeve.
In some embodiments, the preparing a preform based on the drawn material comprises:
stacking the preform core and the plurality of capillaries based on a stacking method, wherein the preform core is positioned at a middle position, and the plurality of capillaries are arranged around the preform core;
binding the piled preform rod cores and the capillaries by using metal wires to obtain a preform rod bundle;
sleeving the first outer sleeve on the prefabricated rod tube bundle;
and filling gaps between the preform tube bundles and the first outer sleeve by utilizing the glass fibers to obtain the preform.
In some embodiments, the preform tube bundle has a regular hexagon in cross-sectional shape perpendicular to the axial direction of the preform core, and the inner diameter of the first outer jacket tube is at least a predetermined length greater than the length of the diagonal of the regular hexagon.
In some embodiments, the drawing the preform comprises: and performing negative pressure pumping operation on the preform, and simultaneously drawing the preform under the condition of maintaining high temperature and negative pressure.
In some embodiments, the drawn material further comprises an inner sleeve and a second outer sleeve, the preparing an air sleeve based on the drawn material comprising:
surrounding a plurality of capillaries on the outer wall of the inner sleeve;
binding the inner sleeve and a plurality of capillaries arranged on the outer wall of the inner sleeve by using metal wires to obtain a capillary surrounding structure;
and sleeving the second outer sleeve on the capillary surrounding structure, and fixing the capillary surrounding structure and the second outer sleeve by utilizing oxyhydrogen flame to obtain the air sleeve.
In some embodiments, the drawing the air jacket comprises: and (3) carrying out negative pressure pumping operation on the air sleeve, and simultaneously drawing the air sleeve under the condition of maintaining high temperature and negative pressure.
In some embodiments, the sleeving the air sleeve after drawing on the preform after drawing to obtain an initial photonic crystal fiber includes:
sleeving the drawn air sleeve on the drawn preform, and fixing the drawn air sleeve and the drawn preform by utilizing oxyhydrogen flame;
and performing negative pressure pumping operation on the drawn air sleeve and the drawn preform rod fixed by oxyhydrogen flame, and simultaneously maintaining a high temperature condition to obtain the initial photonic crystal fiber.
In some embodiments, the drawing the initial photonic crystal fiber to obtain a photonic crystal fiber includes:
drawing the initial photonic crystal fiber at a preset temperature;
when the drawing speed is greater than or equal to a preset speed, providing a first positive pressure for the capillary tube in the preform rod, and simultaneously providing a second positive pressure for the capillary tube in the air sleeve;
and adjusting the first positive pressure and the second positive pressure to ensure that the size of each capillary accords with the preset size, and obtaining the photonic crystal fiber.
In some embodiments, after the drawing the initial photonic crystal fiber to obtain the photonic crystal fiber, the method further includes:
coating the photonic crystal fiber by using coating glue;
intercepting the photonic crystal fiber subjected to the coating operation, and observing a cross-section structure by using a microscope;
and obtaining whether the photonic crystal fiber after the coating operation meets the preset requirement or not according to the cross-section structure.
A second aspect of the embodiment of the present invention provides a photonic crystal fiber, where the photonic crystal fiber is drawn by the method for drawing a photonic crystal fiber according to the first aspect of the embodiment of the present invention, the photonic crystal fiber includes: the device comprises a prefabricated rod and an air sleeve, wherein the air sleeve is sleeved on the prefabricated rod.
In some embodiments, the air sleeve comprises: the capillary tube surrounding structure and the second outer sleeve are sleeved on the capillary tube surrounding structure;
the capillary loop structure comprises: the inner sleeve and the capillary tubes are arranged around the outer wall of the inner sleeve, and the outer walls of the adjacent capillary tubes are mutually abutted.
In some embodiments, the preform comprises: the glass fiber reinforced plastic composite tube comprises a prefabricated rod tube bundle, a first outer sleeve and glass fiber, wherein the first outer sleeve is sleeved on the prefabricated rod tube bundle, a gap is formed between the first outer sleeve and the prefabricated rod tube bundle, and the glass fiber is filled in the gap;
the preform tube bundle includes: the device comprises a preform rod core and a plurality of capillaries, wherein the preform rod core is positioned at a middle position, and the capillaries are piled around the preform rod core.
In some embodiments, the preform tube bundle has a regular hexagon in cross-sectional shape perpendicular to the axial direction of the preform core, and the difference between the inner diameter of the first outer jacket tube and the length of the diagonal line of the regular hexagon is at least 0.5mm.
From the above description, compared with the prior art, the invention has the following beneficial effects:
preparing drawing materials according to the structure of the photonic crystal fiber, respectively preparing a preform and an air sleeve based on the drawing materials, simultaneously respectively drawing the preform and the air sleeve, sleeving the drawn air sleeve on the drawn preform after drawing the preform and the air sleeve to obtain an initial photonic crystal fiber, and finally drawing the initial photonic crystal fiber to obtain the PCF. Compared with the traditional one-step drawing forming mode, the method of the invention draws the prefabricated rod and the air sleeve in stages, and then combines and draws the drawn prefabricated rod and the drawn air sleeve, so that each technological parameter in the drawing process can be accurately controlled, the stability and the replaceability of PCF in the production process are increased, and simultaneously, the radial uniformity of the drawn PCF is better under the conditions of stable temperature, air pressure and drawing speed.
[ description of the drawings ]
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent that the drawings in the following description are only some, but not all embodiments of the invention. Other figures may be obtained from the figures provided without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic flow chart of a method for drawing a photonic crystal fiber according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of step S12 in fig. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic view of a preform according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of step S13 in fig. 1 according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of an air sleeve according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of step S14 in fig. 1 according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of step S15 in fig. 1 according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a photonic crystal fiber according to an embodiment of the present invention;
fig. 9 is an additional flowchart after step S15 in fig. 1 according to an embodiment of the present invention.
[ detailed description ] of the invention
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, fig. 1 is a schematic flow chart of a drawing method of a photonic crystal fiber according to an embodiment of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for drawing a photonic crystal fiber, including the following steps S11 to S15.
S11, preparing a drawing material according to the structure of the photonic crystal fiber;
since photonic crystal fibers have different structures, dimensions and specifications, it is necessary to prepare a corresponding drawing material according to the structure of the photonic crystal fiber to be drawn before drawing the photonic crystal fiber. In particular, these drawing materials may include, but are not limited to, glass filaments, capillaries, preform cores, and first outer jackets. It should be understood that the specifications and dimensions of the drawn materials correspond to those of the photonic crystal fiber to be drawn, and the specifications and dimensions of the drawn materials may include various specifications and dimensions, and the number of the drawn materials is determined according to the photonic crystal fiber to be drawn and the actual drawing process, which is not limited in the embodiment of the present invention.
Preferably, when preparing the drawn material, the diameter error between the capillaries with the same size should be controlled within 0.5% so as to avoid that the photonic crystal fiber finished by the subsequent drawing does not meet the requirements.
S12, preparing a prefabricated rod based on a drawing material, and drawing the prefabricated rod;
after preparation of the drawing materials, the embodiment of the invention firstly needs to use the drawing materials to prepare one of the necessary structures for forming the photonic crystal fiber, namely the preform, and after the preparation of the preform is completed, the drawing work of the preform can be started.
As a possible implementation manner, as shown in fig. 2, a schematic flow chart of step S12 in fig. 1 is provided for an embodiment of the present invention, and as can be seen from fig. 2, step S12 may include the following steps S121 to S124.
S121, stacking a preform rod core and a plurality of capillaries based on a stacking method, wherein the preform rod core is positioned at the middle position, and the capillaries are arranged around the preform rod core;
as is well known in the art, since the stacking method is a common method for drawing photonic crystal fibers, the principles of the stacking method, the stacking process, and the like are not described herein.
It should be noted that when stacking the preform core and the plurality of capillaries, it is necessary to ensure the cleaning of the preform core and each capillary, and further to avoid damage due to excessive extrusion between the preform core and each capillary.
S122, binding the piled preform cores and the capillaries by using metal wires to obtain a preform bundle;
specifically, the cross-sectional shape of the preform tube bundle along the axial direction perpendicular to the preform core may be a regular hexagon. It should be understood that the cross-sectional shape of the preform tube bundle along the axial direction of the vertical preform core is not limited thereto, and in other embodiments, the cross-sectional shape of the preform tube bundle along the axial direction of the vertical preform core may be a regular octagon or the like, and simply, the cross-sectional shape of the preform tube bundle along the axial direction of the vertical preform core is determined according to the photonic crystal fiber to be drawn and the actual application scenario, which is not limited to the embodiment of the present invention.
S123, sleeving the first outer sleeve on the prefabricated rod tube bundle, and filling gaps between the prefabricated rod tube bundle and the first outer sleeve by utilizing glass fibers to obtain prefabricated rods;
after the preform tube bundle is obtained, the first outer jacket tube needs to be sleeved on the preform tube bundle, and since the relationship between the first outer jacket tube and the preform tube bundle is a relationship of being sleeved with each other, the inner diameter of the first outer jacket tube should satisfy the condition that the first outer jacket tube can be sleeved on the preform tube bundle. Taking the shape of the cross section of the preform tube bundle in the direction perpendicular to the axis of the preform core as an example, the inner diameter of the first outer jacket tube should be at least about a predetermined length, such as about 0.5mm, greater than the length of the diagonal of the regular hexagon. It should be understood that the value of the preset length is determined according to the photonic crystal fiber to be drawn and the actual drawing process, and the embodiment of the present invention is not limited thereto.
S124, performing negative pressure pumping operation on the preform, and simultaneously drawing the preform under the condition of maintaining high temperature and negative pressure.
Although the preform has been prepared through steps S121 to S123, the gap between the capillaries in the prepared preform is large, so that in order to obtain a preform having a similar structure to an optical fiber, it is necessary to eliminate the gap between the capillaries during the drawing of the preform, that is, to perform a negative pressure pumping operation on the preform while maintaining a high temperature and a negative pressure.
Further, for a clear understanding of steps S121 to S124, reference may be made to fig. 3, which is a schematic structural diagram of a preform according to an embodiment of the present invention, that is, a schematic structural diagram of a preform prepared by steps S121 to S124, and in fig. 3, structures represented by respective reference numerals are respectively: preform core 103, glass filaments 101, 102 and 104, capillary 105 and first outer jacket tube 106.
S13, preparing an air sleeve based on a drawing material, and drawing the air sleeve;
after the preparation and drawing of the preform are completed, the embodiment of the present invention also needs to prepare an air sleeve, which is another necessary structure for forming the photonic crystal fiber, by using the drawing material prepared in step S11, and after the preparation of the air sleeve is completed, the drawing operation for the air sleeve can be started.
As a possible implementation, as shown in fig. 4, a schematic flow chart of step S13 in fig. 1 is provided for an embodiment of the present invention, it can be seen from fig. 4 that step S13 may include the following steps S131 to S133, and the drawing material prepared in step S11 may further include an inner jacket tube and a second outer jacket tube in order to prepare the air jacket tube. It should be understood that the specifications and dimensions of the inner sleeve and the second outer sleeve correspond to those of the photonic crystal fiber to be drawn, and the specifications and dimensions of the inner sleeve and the second outer sleeve may include various specifications and dimensions, and the number of the inner sleeve and the second outer sleeve is determined according to the photonic crystal fiber to be drawn and the actual drawing process, which is not limited in the embodiment of the present invention.
S131, surrounding the plurality of capillaries on the outer wall of the inner sleeve, binding the inner sleeve and the plurality of capillaries on the outer wall of the inner sleeve by utilizing metal wires, and obtaining a capillary surrounding structure;
in step S131, the capillaries disposed on the outer wall of the inner tube need to be closely arranged, and each capillary needs to be closely attached to the outer wall of the inner tube.
S132, sleeving the second outer sleeve on the capillary surrounding structure, and fixing the capillary surrounding structure and the second outer sleeve by utilizing oxyhydrogen flame to obtain an air sleeve;
s133, performing negative pressure pumping operation on the air sleeve, and simultaneously drawing the air sleeve under the condition of maintaining high temperature and negative pressure.
Though the air jacket has been prepared through steps S131 to S132, the gap between the capillaries in the prepared air jacket is large, so in order to eliminate the gap between the capillaries during the drawing of the air jacket, it is necessary to perform a negative pressure pumping operation on the air jacket during the drawing while the air jacket is drawn under the condition of maintaining a high temperature and a negative pressure.
Further, for a clear understanding of steps S131 to S133, reference may be made to fig. 5, which is a schematic structural diagram of an air sleeve according to an embodiment of the present invention, that is, a schematic structural diagram of an air sleeve prepared by steps S131 to S133, and in fig. 5, structures represented by reference numerals are respectively: an inner sleeve 201, a capillary 203 and a second outer sleeve 202.
S14, sleeving the drawn air sleeve on the drawn preform rod to obtain an initial photonic crystal fiber;
after the prepared air sleeve and the prepared preform rod are respectively drawn, the drawn air sleeve is sleeved on the drawn preform rod to obtain an initial photonic crystal fiber, and at the moment, the initial photonic crystal fiber is drawn to obtain the final photonic crystal fiber.
As a possible implementation manner, as shown in fig. 6, a schematic flow chart of step S14 in fig. 1 provided as an embodiment of the present invention, it can be seen from fig. 6 that step S14 may include the following steps S141 to S142.
S141, sleeving the drawn air sleeve on the drawn preform, and fixing the drawn air sleeve and the drawn preform by utilizing oxyhydrogen flame;
s142, performing negative pressure pumping operation on the drawn air sleeve and the drawn preform rod fixed by oxyhydrogen flame, and simultaneously maintaining a high temperature condition to obtain the initial photonic crystal fiber.
After the drawn air sleeve is sleeved on the drawn preform and fixed by oxyhydrogen flame, negative pressure pumping operation is required to be carried out on the drawn air sleeve fixed by oxyhydrogen flame and the drawn preform, and meanwhile, high temperature conditions are maintained so as to eliminate gaps between the drawn air sleeve and the drawn preform.
And S15, drawing the initial photonic crystal fiber to obtain the photonic crystal fiber.
It is also mentioned above that after the initial photonic crystal fiber is obtained, the initial photonic crystal fiber needs to be drawn to obtain a final photonic crystal fiber.
As a possible implementation manner, as shown in fig. 7, a schematic flow chart of step S15 in fig. 1 provided as an embodiment of the present invention, it can be seen from fig. 7 that step S15 may include the following steps S151 to S153.
S151, drawing the initial photonic crystal fiber at a preset temperature;
when the initial photonic crystal fiber is drawn, it is required to be maintained at a predetermined temperature, for example, 1950 ℃. It should be understood that the preset temperature is determined according to the photonic crystal fiber to be drawn and the actual drawing process, and the embodiment of the present invention is not limited thereto.
S152, when the drawing speed is greater than or equal to a preset speed, providing a first positive pressure for the capillary tube in the preform rod, and simultaneously providing a second positive pressure for the capillary tube in the air sleeve;
in the process of drawing the initial photonic crystal fiber, when the drawing speed is greater than or equal to a preset speed, such as 10m/min, a first positive pressure is required to be provided for the capillary tube in the preform, and a second positive pressure is provided for the capillary tube in the air sleeve, so that the size of each capillary tube is adjusted according to the magnitudes of the first positive pressure and the second positive pressure.
And S153, adjusting the first positive pressure and the second positive pressure to ensure that the size of each capillary accords with the preset size, and obtaining the photonic crystal fiber.
By precisely adjusting the first positive pressure and the second positive pressure, the drawing can be finished after the size of each capillary accords with the preset size, and the drawing of the photonic crystal fiber is finished.
Further, for a clear understanding of steps S151 to S153, reference may be made to fig. 8, which is a schematic structural diagram of a photonic crystal fiber according to an embodiment of the present invention, that is, a schematic structural diagram of a photonic crystal fiber drawn through steps S151 to S153, where in fig. 8, structures represented by respective reference numerals are respectively: a preform core 301, a capillary 302 in the preform, and a capillary 303 in the air sleeve.
Compared with the traditional one-step drawing forming mode, the drawing method of the photonic crystal fiber provided by the embodiment of the invention draws the prefabricated rod and the air sleeve in stages, and then combines and draws the drawn prefabricated rod and the drawn air sleeve, so that each technological parameter in the drawing process can be accurately controlled, the stability and the replaceability of the photonic crystal fiber in the production process are improved, and meanwhile, the radial uniformity of the drawn photonic crystal fiber is better under the conditions of stable temperature, air pressure and drawing speed.
In addition, by the method of drawing the photonic crystal fiber in stages, the stability in the drawing process can be greatly improved, the drawing complexity is reduced, and the method is more advantageous particularly in the case of using gas pressure. As is known in the art, in order to eliminate the gap between the structures (the gap between the capillaries in the air jacket as shown above) during the drawing process, negative pressure is usually required, positive pressure is often required to be applied to control the size of each capillary, and the required sizes of the capillaries of different types are generally different, so that the required sizes of the positive pressure are also different, at this time, multiple positive and negative gas pressures are simultaneously applied to seal and isolate different pressing objects, which is very difficult to operate.
Referring to fig. 9, fig. 9 is an additional flow chart after step S15 in fig. 1 according to an embodiment of the invention.
As shown in fig. 9, in order to perform qualification inspection on the drawn photonic crystal fiber, the following steps S21 to S23 may be further included after step S15.
S21, coating the photonic crystal fiber by using a coating adhesive;
s22, intercepting the photonic crystal fiber subjected to the coating operation, and observing a cross-section structure by using a microscope;
s23, according to the cross-section structure, whether the photonic crystal fiber after the coating operation meets the preset requirement or not is obtained.
When the photonic crystal fiber subjected to the coating operation meets the preset requirement, the drawn photonic crystal fiber is characterized as a qualified product; and when the photonic crystal fiber subjected to the coating operation does not meet the preset requirement, the drawn photonic crystal fiber is characterized as a defective product.
It should be noted that, in the present disclosure, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should also be noted that in the present disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method of drawing a photonic crystal fiber, comprising:
preparing a drawing material according to the structure of the photonic crystal fiber; the drawn material comprises: glass fiber, capillary, preformed rod core and the first outer sleeve;
preparing a preform based on the drawing material, and drawing the preform; the drawing the preform comprises: performing negative pressure pumping operation on the preform rod, and simultaneously drawing the preform rod under the condition of maintaining high temperature and negative pressure;
preparing an air sleeve based on the drawing material, and drawing the air sleeve; the drawing the air jacket includes: performing negative pressure pumping operation on the air sleeve, and simultaneously drawing the air sleeve under the condition of maintaining high temperature and negative pressure;
sleeving the drawn air sleeve on the drawn preform rod to obtain an initial photonic crystal fiber;
drawing the initial photonic crystal fiber to obtain a photonic crystal fiber, including: drawing the initial photonic crystal fiber at a preset temperature; when the drawing speed is greater than or equal to a preset speed, providing a first positive pressure for the capillary tube in the preform rod, and simultaneously providing a second positive pressure for the capillary tube in the air sleeve; and adjusting the first positive pressure and the second positive pressure to ensure that the size of each capillary accords with the preset size, and obtaining the photonic crystal fiber.
2. The method of drawing a photonic crystal fiber according to claim 1, wherein said preparing a preform based on said drawn material comprises:
stacking the preform core and the plurality of capillaries based on a stacking method, wherein the preform core is positioned at a middle position, and the plurality of capillaries are arranged around the preform core;
binding the piled preform rod cores and the capillaries by using metal wires to obtain a preform rod bundle;
sleeving the first outer sleeve on the prefabricated rod tube bundle;
and filling gaps between the preform tube bundles and the first outer sleeve by utilizing the glass fibers to obtain the preform.
3. The method of drawing a photonic crystal fiber according to claim 2, wherein the preform tube bundle has a regular hexagon in a cross-sectional shape perpendicular to the axial direction of the preform core, and the inner diameter of the first outer jacket tube is larger than at least a length of a diagonal line of the regular hexagon by a predetermined length.
4. The method of drawing a photonic crystal fiber according to claim 1, wherein the drawn material further comprises an inner jacket tube and a second outer jacket tube, the preparing an air jacket tube based on the drawn material comprising:
surrounding a plurality of capillaries on the outer wall of the inner sleeve;
binding the inner sleeve and a plurality of capillaries arranged on the outer wall of the inner sleeve by using metal wires to obtain a capillary surrounding structure;
and sleeving the second outer sleeve on the capillary surrounding structure, and fixing the capillary surrounding structure and the second outer sleeve by utilizing oxyhydrogen flame to obtain the air sleeve.
5. The method for drawing a photonic crystal fiber according to claim 1, wherein the sleeving the air jacket after drawing on the preform after drawing to obtain an initial photonic crystal fiber comprises:
sleeving the drawn air sleeve on the drawn preform, and fixing the drawn air sleeve and the drawn preform by utilizing oxyhydrogen flame;
and performing negative pressure pumping operation on the drawn air sleeve and the drawn preform rod fixed by oxyhydrogen flame, and simultaneously maintaining a high temperature condition to obtain the initial photonic crystal fiber.
6. The method of drawing a photonic crystal fiber according to claim 1, wherein after the drawing the initial photonic crystal fiber to obtain a photonic crystal fiber, further comprising:
coating the photonic crystal fiber by using coating glue;
intercepting the photonic crystal fiber subjected to the coating operation, and observing a cross-section structure by using a microscope;
and obtaining whether the photonic crystal fiber after the coating operation meets the preset requirement or not according to the cross-section structure.
7. A photonic crystal fiber drawn by the drawing method of the photonic crystal fiber according to any one of claims 1 to 6, the photonic crystal fiber comprising: the device comprises a prefabricated rod and an air sleeve, wherein the air sleeve is sleeved on the prefabricated rod; the preform includes: the glass fiber reinforced plastic composite tube comprises a prefabricated rod tube bundle, a first outer sleeve and glass fiber, wherein the first outer sleeve is sleeved on the prefabricated rod tube bundle, a gap is formed between the first outer sleeve and the prefabricated rod tube bundle, and the glass fiber is filled in the gap;
the preform tube bundle includes: the device comprises a preform rod core and a plurality of capillaries, wherein the preform rod core is positioned at a middle position, and the capillaries are piled around the preform rod core.
8. The photonic crystal fiber according to claim 7, wherein said air jacket comprises: the capillary tube surrounding structure and the second outer sleeve are sleeved on the capillary tube surrounding structure;
the capillary loop structure comprises: the inner sleeve and the capillary tubes are arranged around the outer wall of the inner sleeve, and the outer walls of the adjacent capillary tubes are mutually abutted.
9. The photonic crystal fiber according to claim 7, wherein the preform tube bundle has a regular hexagon in a cross-sectional shape perpendicular to the axial direction of the preform core, and the difference between the inner diameter of the first outer jacket tube and the length of the diagonal line of the regular hexagon is at least 0.5mm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009116193A (en) * | 2007-11-08 | 2009-05-28 | Mitsubishi Cable Ind Ltd | Double clad fiber |
| CN108333670A (en) * | 2018-05-04 | 2018-07-27 | 中国电子科技集团公司第四十六研究所 | A kind of active microstructured optical fibers of aperiodicity coarse pitch single mode |
| CN207760229U (en) * | 2017-12-25 | 2018-08-24 | 北京玻璃研究院 | A kind of photon crystal optical fiber preformed rod structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7280730B2 (en) * | 2004-01-16 | 2007-10-09 | Imra America, Inc. | Large core holey fibers |
| DK1770417T3 (en) * | 2005-09-29 | 2008-07-28 | Trumpf Laser Gmbh & Co Kg | Optical fiber and its method of manufacture |
| SG11201803838TA (en) * | 2015-11-10 | 2018-06-28 | Nkt Photonics As | An element for a preform, a fiber production method and an optical fiber drawn from the preform |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009116193A (en) * | 2007-11-08 | 2009-05-28 | Mitsubishi Cable Ind Ltd | Double clad fiber |
| CN207760229U (en) * | 2017-12-25 | 2018-08-24 | 北京玻璃研究院 | A kind of photon crystal optical fiber preformed rod structure |
| CN108333670A (en) * | 2018-05-04 | 2018-07-27 | 中国电子科技集团公司第四十六研究所 | A kind of active microstructured optical fibers of aperiodicity coarse pitch single mode |
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