Heating unit for MCVD (modified chemical vapor deposition) process
By designing quartz and metal torch heating units for the main and auxiliary heating points, the problem of rare earth ion escape was solved, the laser efficiency and rare earth ion concentration of rare earth doped optical fibers were improved, and the refractive index depression at the center of the fiber core was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-20
AI Technical Summary
During the fabrication of rare-earth-doped optical fibers, the escape of rare-earth ions leads to a low concentration of rare-earth ions in the fiber core and a large refractive index depression, which affects the light output efficiency of the optical fiber. Existing torches have a wide temperature range, and rare-earth ions stay in the high-temperature region for a long time, making the escape phenomenon unavoidable.
Quartz torches and metal torches are used as heating sources. A main heating point and a secondary heating point are designed. The main heating point is a conventional seven-core quartz torch, which is suitable for the deposition and oxidation drying of porous materials. The secondary heating point is a single-core metal torch, which provides concentrated temperature and is suitable for the vitrification of porous materials, thus shortening the escape time of rare earth ions.
By using zoned heating, the escape of rare earth ions is reduced, the laser efficiency of rare earth-doped active optical fibers is improved, the doping concentration of rare earth ions in the fiber core is increased, and the refractive index dip is reduced.
Smart Images
Figure CN224015773U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to prefabricated rod production technical field, especially, relate to a kind of heating unit of MCVD vapor deposition process. BACKGROUND
[0002] For MCVD vapor deposition process, mainly including base pipe pretreatment, deposition inner cladding in base pipe again, deposition loose body layer, loose body soaking, oxidation drying, vitrification and collapse into transparent solid rod and so on, wherein base pipe pretreatment needs to be preheated, deposition inner cladding, deposition loose body layer, oxidation drying, vitrification and collapse step all need to use blowtorch to heat workpiece.
[0003] However, in the preparation process of rare earth doped active optical fiber, rare earth ions (such as ytterbium, erbium, thulium, etc.) may escape, which causes the concentration of rare earth ions in the core center of the optical fiber to be suddenly low, the refractive index to be deeply depressed, and the light output efficiency of the optical fiber to be affected. In the preparation process of rare earth doped optical fiber preform, if the time of rare earth ion escape during the vitrification of the loose body can be shortened and the escape of rare earth elements can be maximally controlled, the rare earth ion doping concentration in the core center of the optical fiber can be improved, the refractive index depression in the core center can be reduced, and the laser efficiency of the rare earth doped active optical fiber can be improved.
[0004] Rare earth ion escape mainly occurs during the vitrification of the loose body. The longer the high temperature time, the longer the rare earth ion escape time, and the greater the ion concentration depression. The currently used blowtorch is a conventional MCVD seven-core quartz blowtorch or a multi-core metal ring blowtorch. The temperature zone of these two blowtorches is relatively wide, the rare earth ions stay in the high temperature zone for a long time, and the phenomenon of rare earth ion escape cannot be avoided.
[0005] Therefore, designing a heating unit with a narrow temperature zone and concentrated temperature can improve the quality of optical fiber products, which is a problem that needs to be solved by workers in the field. SUMMARY
[0006] The utility model discloses a kind of heating unit of MCVD vapor deposition process, by design quartz blowtorch and metal blowtorch as heating source, main heating point is conventional seven-core quartz blowtorch, with high temperature zone wide feature, suitable for loose body deposition, oxidation drying, collapse and so on Process, secondary heating point produces single-core metal blowtorch, with high temperature zone narrow, temperature concentration and so on Characteristics, suitable for loose body vitrification process use, can shorten the time of rare earth ion escape during the vitrification of the loose body, reduce refractive index depression in the core center, improve the laser efficiency of the rare earth doped active optical fiber.
[0007] To solve the above technical problems, the utility model is realized by the following technical schemes:
[0008] The utility model relates to a kind of heating unit of MCVD vapor deposition process, including main burner, auxiliary burner and connecting seat.
[0009] The main burner is quartz burner, the auxiliary burner is metal burner, the auxiliary burner is fixed on the side of main burner by connecting seat inclination;
[0010] Vertical plate is fixed in the middle of connecting seat top surface, the vertical plate is arranged between main burner and auxiliary burner, and the vertical plate top surface extends to the top of main burner and auxiliary burner above;
[0011] Sleeve is fixed in the middle of vertical plate, rotating rod is rotatably connected in sleeve, arc-shaped cover plate is fixed in the top of rotating rod, and rotating cylinder is connected in the bottom of rotating rod and penetrates connecting seat;
[0012] Arc-shaped cover plate, vertical plate and connecting seat are all heat insulation plate bodies.
[0013] Further, it further includes MCVD lathe, and the MCVD lathe is equipped with deposition station, and the main burner and the auxiliary burner are all towards deposition station.
[0014] Further, the number of burner wick of main burner is set to seven, and the number of burner wick of auxiliary burner is set to one.
[0015] Further, fuel interface is equipped on the main burner and the auxiliary burner, and the fuel interface is all located in the position below connecting seat.
[0016] Further, main through hole and auxiliary through hole are on connecting seat, and main burner and auxiliary burner are respectively arranged in main through hole and auxiliary through hole.
[0017] Further, connecting seat is horizontal section and inclined section, main through hole and vertical plate are connected on horizontal section, and auxiliary through hole is arranged on inclined section.
[0018] The utility model has the following beneficial effects:
[0019] 1. The utility model discloses a quartz burner and metal burner are designed as heating source, can be divided into two heating points of main and auxiliary, two heating points bear different roles respectively, main heating point is conventional seven-core quartz burner, has high temperature zone wide feature, is suitable for loose body deposition, oxidation drying, collapse and other processes, auxiliary heating point produces single-core metal burner, has high temperature zone narrow, temperature concentration and other characteristics, is suitable for loose body vitrification process use, can shorten the time of rare earth ion escape in loose body vitrification process, maximum limit control rare earth element escape, can promote the concentration of rare earth ion doping in optical fiber core center, reduce the refractive index depression of core center, improve rare earth doped active optical fiber laser efficiency.
[0020] 2. The utility model discloses a vice burner is made of metal material, need not water cooling, with simple structure and convenient installation connection's characteristics, can block the heat conduction between both through the design of heat -proof riser, arc cover board, reduce the influence that vice burner operating heat transfers to main burner, improve the service life of two burners.
[0021] Of course, it is not necessary to achieve all the advantages described above while implementing any product of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be needed to use the drawing described in the embodiment briefly introduce, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.
[0023] Figure 1 It is the structure diagram of the heating unit of the MCVD vapor deposition process of the utility model;
[0024] In the drawing, the component list represented by each sign is as follows:
[0025] 1-main burner, 2-vice burner, 3-connection seat, 301-riser, 302-sleeve, 303-rotary rod, 304-arc cover plate, 305-rotary cylinder, 306-main through hole, 307-vice through hole. DETAILED DESCRIPTION
[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely in the following in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0027] Please refer to Figure 1 The utility model discloses a heating unit of MCVD vapor deposition process, including main burner 1, vice burner 2 and connection seat 3;
[0028] Main burner 1 is quartz burner, and vice burner 2 is metal burner, and vice burner 2 is fixedly inclined in the side of main burner 1 through connection seat 3;
[0029] The riser 301 is arranged at the position between the main burner 1 and the vice burner 2, and the top surface of the riser 301 extends above the top ends of the main burner 1 and the vice burner 2.
[0030] The middle part of the vertical plate 301 is fixed with a sleeve 302, the sleeve 302 is rotationally connected with a rotating rod 303, the top end of the rotating rod 303 is fixed with an arc-shaped cover plate 304, the bottom end of the rotating rod 303 penetrates the connecting seat 3 and is connected with a rotary air cylinder 305.
[0031] The arc-shaped cover plate 304, the vertical plate 301 and the connecting seat 3 are all heat insulation plate bodies.
[0032] The MCVD lathe is internally provided with a deposition station, and the main torch 1 and the auxiliary torch 2 are both directed to the deposition station.
[0033] As shown in the figure, Figure 1 The number of the wicks of the main torch 1 is set to seven, and the number of the wicks of the auxiliary torch 2 is set to one.
[0034] As shown in the figure, Figure 1 The main torch 1 and the auxiliary torch 2 are both provided with fuel interfaces, and the fuel interfaces are all located below the connecting seat 3.
[0035] As shown in the figure, Figure 1 The main torch 1 and the auxiliary torch 2 are respectively arranged in the main through port 306 and the auxiliary through port 307.
[0036] As shown in the figure, Figure 1 The connecting seat 3 is a horizontal section and an inclined section, the main through port 306 and the vertical plate 301 are connected on the horizontal section, and the auxiliary through port 307 is arranged on the inclined section.
[0037] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0038] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details, nor limit the present application to the specific embodiments described. Obviously, according to the content of the present specification, many modifications and changes can be made. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that the persons skilled in the art can well understand and utilize the present application. The present application is limited by the claims and the entire scope and equivalents thereof.
Claims
1. A heating unit for an MCVD vapor deposition process, characterized in that: Includes main torch (1), auxiliary torch (2) and connecting base (3); The main torch (1) is a quartz torch, and the auxiliary torch (2) is a metal torch. The auxiliary torch (2) is fixed at an angle to one side of the main torch (1) by a connecting seat (3). A vertical plate (301) is fixed in the middle of the top surface of the connecting seat (3). The vertical plate (301) is located between the main torch (1) and the auxiliary torch (2). The top surface of the vertical plate (301) extends to the top of the main torch (1) and the auxiliary torch (2). A sleeve (302) is fixed in the middle of the vertical plate (301), and a rotating rod (303) is rotatably connected inside the sleeve (302). An arc-shaped cover plate (304) is fixed at the top of the rotating rod (303), and a rotating cylinder (305) is connected to the bottom of the rotating rod (303) through the connecting seat (3). The arc-shaped cover plate (304), the vertical plate (301) and the connecting seat (3) are all heat insulation plates.
2. The heating unit for an MCVD vapor deposition process according to claim 1, characterized in that, It also includes an MCVD lathe, which has a deposition station, and the main torch (1) and the auxiliary torch (2) are both facing the deposition station.
3. The heating unit for an MCVD vapor deposition process according to claim 1, characterized in that, The main torch (1) has seven wicks, and the auxiliary torch (2) has one wick.
4. The heating unit for an MCVD vapor deposition process according to claim 1, characterized in that, Both the main torch (1) and the auxiliary torch (2) are equipped with fuel inlets, which are located below the connector (3).
5. The heating unit for an MCVD vapor deposition process according to claim 1, characterized in that, The connector (3) has a main port (306) and a secondary port (307), and the main torch (1) and the secondary torch (2) are respectively installed through the main port (306) and the secondary port (307).
6. The heating unit for an MCVD vapor deposition process according to claim 5, characterized in that, The connecting seat (3) consists of a horizontal section and an inclined section. The main port (306) and the vertical plate (301) are connected on the horizontal section, and the secondary port (307) is located on the inclined section.