A production method of panda-type erbium-doped optical fiber

Abstract

The invention discloses a production method of a panda-type erbium-doped optical fiber, and relates to the technical field of erbium-doped optical fiber. The invention comprises the following steps: SS01 making of an erbium-doped core rod, SS02 slotting of an erbium-doped core rod, SS03 making of a casing layer, SS04 slotting of a casing layer, SS05 making a stress mother rod through an MCVD process, SS06 assembling of a preform rod, SS07 fiber forming, and the first hole-opening machine tool comprises a first drill rod body, and the end of the first drill rod body is provided with a first drill bit body. The invention divides the optical fiber preform rod into three parts, namely, an erbium-doped core rod, a casing layer and a stress mother rod, and processes them separately and finally assembles and inlays them, and the side hole for installing the stress mother rod is divided into two parts and is respectively arranged on the erbium-doped core rod and the casing layer, which is conducive to the hole-opening and slotting operation, and there is no need to open a hole for the single-mode mother rod subsequently, and the slotting accuracy can be controlled, which is convenient for production and processing, thereby improving the production of the optical fiber preform rod, and improving the production efficiency and accuracy of the subsequent optical fiber.

Description

Technical Field

[0001] The invention belongs to the technical field of erbium-doped optical fibers, and particularly relates to a production method of panda-type erbium-doped optical fibers. Background Art

[0002] For the processing of erbium-doped optical fiber, a single-mode mother rod is produced through MCVD deposition process, offline liquid phase doping, dehydration vitrification, rod shrinking process and casing process. Two symmetrical side holes are opened in the single-mode mother rod, and stress mother rods are embedded and installed in the side holes to finally form a preform rod. Subsequently, the optical fiber is produced through the coating equipment of the drawing equipment.

[0003] However, since the single-mode mother rod is long after shrinking, it is not conducive to subsequent stable and accurate drilling, which will affect the drilling efficiency and quality, and thus affect the subsequent optical fiber quality. Therefore, designing an optical fiber preform that is easy to produce, has high precision and strong stability is a problem that needs to be solved by the staff in this field. Summary of the invention

[0004] The object of the present invention is to provide a method for producing a panda-type erbium-doped optical fiber, wherein an optical fiber preform is divided into three parts, namely, an erbium-doped core rod, a sleeve layer and a stress mother rod, which are processed separately and finally assembled and inlaid, and a side hole for installing the stress mother rod is divided into two parts and respectively arranged on the erbium-doped core rod and the sleeve layer, which is conducive to the hole-making and groove-making operations, and there is no need to subsequently make holes in the single-mode mother rod, and the groove-making accuracy can be controlled, which is convenient for production and processing, thereby improving the production of optical fiber preforms and improving the subsequent production efficiency and accuracy of optical fibers.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a method for producing a panda-type erbium-doped optical fiber, comprising the following steps:

[0007] SS01 Preparation of Erbium-doped Core Rod: Erbium-doped core rod is produced through MCVD deposition process, offline liquid phase doping, dehydration vitrification and rod shrinking process;

[0008] SS02 Slotting of erbium-doped core rod: Two symmetrical inner arc grooves are formed on the erbium-doped core rod by the first hole-opening machine;

[0009] Production of SS03 casing layer: Select a casing of suitable size, and produce an outer pure silicon layer inside the casing through the MCVD process. Two symmetrical crescent grooves are directionally etched on the inner wall of the outer pure silicon layer by inputting corrosive gas;

[0010] SS04 Slotting of casing layer: two outer arc grooves are opened at the positions of two crescent grooves by the second hole opening machine;

[0011] SS05 uses MCVD process to produce stress master bar;

[0012] Assembly of SS06 preform: Arrange the stress mother rod relative to the inner arc groove and the outer arc groove, and embed and fix the stress mother rod and the erbium-doped core rod in the outer pure silicon layer to make the preform;

[0013] SS07 fiber forming: The preform rod is drawn into optical fiber through a drawing furnace;

[0014] The first drilling machine tool comprises a first drill rod body, a first drill bit body is provided at the end of the first drill rod body, a first rotating sleeve is sleeved on the first drill rod body near the first drill bit body, arcuate edges are provided on both sides of the first rotating sleeve, a plurality of first balls are provided on the inner side of the arcuate edges, a guide column is provided on the first drilling machine tool, a sliding sleeve is fixed on the first rotating sleeve through a connecting rod, and the sliding sleeve slides along the guide column;

[0015] The second drilling machine tool includes a second drill rod body, a second drill bit body is provided at the end of the second drill rod body, a second rotating sleeve is sleeved on the second drill rod body near the second drill bit body, a guide sleeve body is fixed on the inner side of the second rotating sleeve, and a plurality of second balls are provided on the peripheral side of the guide sleeve body.

[0016] Furthermore, the grooving of the erbium-doped core rod in the SS02 specifically includes the following steps: the first drill rod body rotates to drive the first drill bit body to rotate and groove, during which the first drill rod body moves in steps along the length direction of the erbium-doped core rod, and the guide sleeve body slides along the guide column, and a plurality of first balls roll along the outer surface of the erbium-doped core rod.

[0017] Furthermore, the grooving of the casing layer in the SS04 specifically includes the following steps: the second drill rod body rotates to drive the second drill bit body to rotate to groove at the position of the crescent groove, during which the second drill rod body moves stepwise along the outer pure silicon layer, and the second ball on the outer surface of the sleeve rolls along the inner wall of the outer pure silicon layer.

[0018] Furthermore, the inner arc groove and the outer arc groove are arranged relative to each other and form a cylindrical through-opening, and the stress mother rod is embedded and fixed in the through-opening.

[0019] Furthermore, the preparation of the erbium-doped core rod in the SS01 specifically includes the following steps: producing an inner pure silicon layer and a loose core layer in a substrate tube, immersing the deposited erbium-doped core rod in a prepared mixed solution of ErCl3 and YbCl3 at room temperature to uniformly adsorb Er and Yb on the loose core layer, introducing a mixed gas of high-purity chlorine and oxygen at a suitable temperature, performing drying and dehydration treatment, vitrifying the core rod at a high temperature after dehydration and drying, and sintering the erbium-doped core rod into a solid rod under high temperature conditions.

[0020] Furthermore, before the SS06 preform rods are assembled and inlaid, the stress mother rod, the erbium-doped core rod and the sleeve layer are ground, polished and cleaned.

[0021] Furthermore, after the SS06 preform is manufactured, a preformed cone head is processed at the end of the preform.

[0022] Furthermore, during the optical fiber drawing process of the SS07, a low-refractive-index ultraviolet-curable coating is coated online on the outer surface of the optical fiber as the outer cladding of the optical fiber.

[0023] Furthermore, after the outer cladding of the optical fiber in the SS07 is manufactured, parameter tests are performed on the manufactured optical fiber to ultimately meet the index requirements.

[0024] The present invention has the following beneficial effects:

[0025] 1. The present invention divides the optical fiber preform into three parts, namely, an erbium-doped core rod, a sleeve layer and a stress mother rod, and processes them separately and finally assembles and inlays them. The side hole for installing the stress mother rod is divided into two parts and is respectively arranged on the erbium-doped core rod and the sleeve layer, which is conducive to the hole-making and groove-making operations. There is no need to make holes in the single-mode mother rod subsequently, and the groove-making accuracy can be controlled, which is convenient for production and processing, thereby improving the production of optical fiber preforms and improving the subsequent production efficiency and accuracy of optical fibers.

[0026] 2. The erbium-doped core rod and casing layer designed in the utility model both facilitate the guiding of the drill rod. Together with the new guiding mechanism, they can guide and support the drill bit end of the drill rod, ensuring the straightness and stability of the drill bit movement of the drill rod, and avoiding the problem of insufficient stability of the drill bit end caused by the excessive length of the drill rod.

[0027] 3. The utility model provides a crescent groove in the outer pure silicon layer of the casing layer, thereby reducing the portion of the outer pure silicon layer that needs to be cut and reducing the material layer that needs to be drilled by the drill rod, thereby reducing the load on the drill rod and greatly improving the grooving speed.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 It is a flow chart of a method for producing a panda-type erbium-doped optical fiber of the present invention;

[0031] Figure 2 is a structural cross-sectional view of a preform rod of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the erbium-doped core rod, the first drill rod body and the guide column;

[0033] Figure 4 is a schematic structural diagram of a first drill rod body and a guide column;

[0034] Figure 5 It is a schematic diagram of the structure of the casing layer and the second drill pipe body;

[0035] Figure 6 is a structural schematic diagram of a second drill pipe body;

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1- erbium-doped core rod, 2- casing layer, 3- stress mother rod, 4- first drill rod body, 5- first rotating sleeve, 6- guide column, 7- second drill rod body, 101- inner arc groove, 102- inner pure silicon layer, 201- casing, 202- outer pure silicon layer, 203- outer arc groove, 401- first drill bit body, 501- arc edge, 502- first ball, 503- sliding sleeve, 504- connecting rod, 701- second drill bit body, 702- second rotating sleeve, 703- guide sleeve body, 704- second ball. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-6 As shown, the present invention is a method for producing a panda-type erbium-doped optical fiber, comprising the following steps:

[0040] SS01 Preparation of Erbium-doped Core Rod 1: Erbium-doped core rod 1 is prepared by MCVD deposition process, offline liquid phase doping, dehydration vitrification and rod shrinking process;

[0041] SS02 Slotting of the erbium-doped core rod 1: two symmetrical inner arc grooves 101 are formed on the erbium-doped core rod 1 by a first hole-making machine tool;

[0042] SS03 Fabrication of casing layer 2: Select a casing 201 of suitable size, and fabricate an outer pure silicon layer 202 in the casing 201 by MCVD process, and directionally etch two symmetrical crescent grooves on the inner wall of the outer pure silicon layer 202 by inputting corrosive gas;

[0043] SS04 Slotting of casing layer 2: two outer arc grooves 203 are opened at the positions of two crescent grooves by a second hole opening machine;

[0044] SS05 stress master bar 3 is produced by MCVD process;

[0045] Assembly of SS06 preform: Arrange the stress mother rod 3, the inner arc groove 101 and the outer arc groove 203 relative to each other, and embed and fix the stress mother rod 3 and the erbium-doped core rod 1 in the outer pure silicon layer 202 to make a preform;

[0046] SS07 fiber forming: The preform rod is drawn into optical fiber through a drawing furnace;

[0047] The first drilling machine tool comprises a first drilling rod body 4, a first drill head body 401 is provided at the end of the first drilling rod body 4, a first rotating sleeve 5 is sleeved on the first drilling rod body 4 near the first drill head body 401, arcuate edges 501 are provided on both sides of the first rotating sleeve 5, a plurality of first balls 502 are provided on the inner side of the arcuate edges 501, a guide column 6 is provided on the first drilling machine tool, a sliding sleeve 503 is fixed on the first rotating sleeve 5 through a connecting rod 504, and the sliding sleeve 503 slides along the guide column 6;

[0048] The second drilling machine tool includes a second drill rod body 7, a second drill bit body 701 is provided at the end of the second drill rod body 7, a second rotating sleeve 702 is sleeved on the second drill rod body 7 near the second drill bit body 701, a guide sleeve body 703 is fixed inside the second rotating sleeve 702, and a plurality of second balls 704 are provided on the peripheral side of the guide sleeve body 703.

[0049] Among them Figure 3-4 As shown, the grooving of the erbium-doped core rod 1 in SS02 specifically includes the following steps: the first drill rod body 4 rotates to drive the first drill bit body 401 to rotate and groove, during which the first drill rod body 4 moves stepwise along the length direction of the erbium-doped core rod 1, and the guide sleeve body 703 slides along the guide column 6, and a plurality of first balls 502 roll along the outer surface of the erbium-doped core rod 1.

[0050] Among them Figure 5-6 As shown, the grooving of the casing layer 2 in SS04 specifically includes the following steps: the second drill rod body 7 rotates to drive the second drill bit body 701 to rotate and groove at the position of the crescent groove. During this period, the second drill rod body 7 moves stepwise along the outer pure silicon layer 202, and the second ball 704 on the outer surface of the sliding sleeve 503 rolls along the inner wall of the outer pure silicon layer 202.

[0051] Among them Figure 1-2 As shown, the inner arc groove 101 and the outer arc groove 203 are arranged opposite to each other and form a cylindrical through-opening, and the stress mother rod 3 is embedded and fixed in the through-opening.

[0052] Among them, the preparation of the erbium-doped core rod 1 in SS01 specifically includes the following steps: making an inner pure silicon layer 102 and a loose core layer in a substrate tube, immersing the deposited erbium-doped core rod 1 in a prepared mixed solution of ErCl3 and YbCl3 at room temperature to make Er and Yb uniformly adsorbed on the loose core layer, introducing a mixed gas of high-purity chlorine and oxygen at a suitable temperature, performing drying and dehydration treatment, vitrifying at high temperature after dehydration and drying, and sintering the erbium-doped core rod 1 into a solid rod under high temperature conditions.

[0053] Before the SS06 preform rods are assembled and inlaid, the stress mother rod 3, the erbium-doped core rod 1 and the sleeve layer 2 are ground, polished and cleaned.

[0054] Among them, after the SS06 preform rod is manufactured, a prefabricated cone head is processed at the end of the preform rod.

[0055] Among them, during the optical fiber drawing process of SS07, a low-refractive-index ultraviolet-cured coating is coated online on the outer surface of the optical fiber as the outer cladding of the optical fiber.

[0056] Among them, after the outer cladding of the optical fiber in SS07 is completed, the parameters of the manufactured optical fiber are tested and finally meet the index requirements.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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.

[0058] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for producing a panda-type erbium-doped optical fiber, characterized in that: The following steps are involved: SS01 Preparation of Erbium-doped Core Rod (1): The Erbium-doped core rod (1) is prepared by MCVD deposition process, offline liquid phase doping, dehydration vitrification and rod shrinking process; SS02 Slotting of the erbium-doped core rod (1): two symmetrical inner arc-shaped grooves (101) are formed on the erbium-doped core rod (1) by a first hole-making machine tool; Preparation of SS03 sleeve layer (2): Select a sleeve (201) of suitable size, and use MCVD process to produce an outer pure silicon layer (202) in the sleeve (201), and directionally etch two symmetrical crescent grooves on the inner wall of the outer pure silicon layer (202) by inputting corrosive gas; Grooving of the SS04 casing layer (2): two outer arc grooves (203) are opened at the positions of the two crescent grooves by a second drilling machine tool; SS05 stress master bar (3) is produced by MCVD process; Assembly of the SS06 preform: the stress mother rod (3) is arranged relative to the inner arc groove (101) and the outer arc groove (203), and the stress mother rod (3) and the erbium-doped core rod (1) are integrally embedded and fixed in the outer pure silicon layer (202) to produce the preform; SS07 fiber forming: The preform rod is drawn into optical fiber through a drawing furnace; The first drilling machine tool comprises a first drilling rod body (4), a first drill bit body (401) is provided at the end of the first drilling rod body (4), a first rotating sleeve (5) is sleeved on the first drilling rod body (4) near the first drill bit body (401), arcuate edges (501) are provided on both sides of the first rotating sleeve (5), a plurality of first balls (502) are provided inside the arcuate edges (501), the first drilling machine tool is provided with a guide column (6), a sliding sleeve (503) is fixed to the first rotating sleeve (5) via a connecting rod (504), and the sliding sleeve (503) slides along the guide column (6); The second drilling machine tool comprises a second drill rod body (7), a second drill head body (701) is provided at the end of the second drill rod body (7), a second rotating sleeve (702) is sleeved on the second drill rod body (7) near the second drill head body (701), a guide sleeve body (703) is fixed inside the second rotating sleeve (702), and a plurality of second rolling balls (704) are provided on the peripheral side of the guide sleeve body (703); The inner arc-shaped groove (101) and the outer arc-shaped groove (203) are arranged relative to each other and form a cylindrical through-opening, and the stress mother rod (3) is embedded and fixed in the through-opening.

2. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: The slotting of the erbium-doped core rod (1) in the SS02 specifically comprises the following steps: the first drill rod body (4) rotates to drive the first drill bit body (401) to rotate and slot, during which the first drill rod body (4) moves stepwise along the length direction of the erbium-doped core rod (1), and the guide sleeve body (703) slides along the guide column (6), and a plurality of first balls (502) roll along the outer surface of the erbium-doped core rod (1).

3. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: The grooving of the casing layer (2) in the SS04 specifically comprises the following steps: the second drill rod body (7) rotates to drive the second drill bit body (701) to rotate to groove at the position of the crescent groove, during which the second drill rod body (7) moves stepwise along the outer pure silicon layer (202), and at this time, the second ball (704) on the outer surface of the sliding sleeve (503) rolls along the inner wall of the outer pure silicon layer (202).

4. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: The preparation of the erbium-doped core rod (1) in the SS01 specifically comprises the following steps: forming an inner pure silicon layer (102) and a loose core layer in a substrate tube, immersing the deposited erbium-doped core rod (1) in a prepared mixed solution of ErCl3 and YbCl3 at room temperature to allow Er and Yb to be uniformly adsorbed on the loose core layer, introducing a mixed gas of high-purity chlorine and oxygen at a suitable temperature to perform drying and dehydration treatment, vitrifying the erbium-doped core rod (1) at a high temperature after dehydration and drying, and sintering the erbium-doped core rod (1) into a solid rod body under high temperature conditions.

5. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: Before the SS06 preform rods are assembled and inlaid, the stress mother rod (3), the erbium-doped core rod (1) and the sleeve layer (2) are ground, polished and cleaned.

6. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: After the SS06 preform is manufactured, a prefabricated cone head is processed at the end of the preform.

7. The method for producing a panda-type erbium-doped optical fiber according to claim 1, characterized in that: During the optical fiber drawing process of the SS07, a low-refractive-index ultraviolet-cured coating is coated online on the outer surface of the optical fiber as the outer cladding of the optical fiber.

8. The method for producing a panda-type erbium-doped optical fiber according to claim 7, characterized in that: After the outer cladding of the optical fiber in the SS07 is manufactured, parameter tests are performed on the manufactured optical fiber to finally meet the index requirements.

Images