Single-mode mother rod reaction tube based on Er-doped optical fiber preform

Abstract

The utility model discloses a single-mode mother rod reaction tube based on an erbium-doped optical fiber preform, and relates to the technical field of erbium-doped optical fiber production. The feeding pipe comprises a base pipe body and two feeding end pipes, a blocking layer and a loose core layer are sequentially arranged in the base pipe body, clamping grooves are formed in the circumferential side faces of the two ends of the base pipe body, one end of each feeding end pipe is provided with a connector end, the other end of each feeding end pipe is connected with a positioning end sleeve, a positioning backing ring is arranged in the positioning end sleeve and close to the end pipe, and the positioning backing ring is a soft sealing backing ring. The feeding end pipes are designed to be mounted at the two ends of the reaction pipes, sealing, liquid input and output and gas input and output can be performed on the reaction pipes, so that mixed liquid can be input into the reaction pipes for off-line liquid phase doping, the Er content and the Yb content in the mixed liquid in each reaction pipe are consistent, the adsorption efficiency and the adsorption quantity are ensured, and the service life of the reaction pipes is prolonged. And meanwhile, the use of mixed liquid can be saved, and the resource waste is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of erbium-doped optical fiber production, in particular to a single-mode mother rod reaction tube based on an erbium-doped optical fiber preform rod. Background Art

[0002] For the production of erbium-doped optical fiber, a barrier layer and a loose core layer are first deposited inside the base tube body, and then the base tube with the barrier layer and the loose core layer deposited is immersed in a prepared mixed solution of ErCl3 and YbCl3. The immersion is carried out at room temperature so that Er and Yb are uniformly adsorbed on the loose core layer. A mixed gas of high-purity chlorine and oxygen is introduced at a suitable temperature, and the immersed reaction tube is dried and dehydrated. The dehydrated and dried reaction tube is vitrified at high temperature to form a reaction tube, and then the erbium-doped optical fiber preform is produced through the subsequent processes of shrinking, casing, punching and assembly.

[0003] For the preparation of existing reaction tubes, the deposited substrate tube needs to be directly immersed in the solution. However, since Er and Yb in the solution will be adsorbed in the reaction tube, the Er and Yb content in the solution will be reduced, which is not conducive to subsequent reuse and affects the adsorption efficiency and adsorption amount. In addition, the entire tube needs to be immersed each time, which will cause waste of the mixed solution.

[0004] Therefore, designing a reaction tube that can save mixed solution and achieve stable adsorption is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The utility model aims to provide a single-mode mother rod reaction tube based on erbium-doped optical fiber preform, which can seal the reaction tube, input and output liquid and gas by designing feed end tubes installed at both ends of the reaction tube, so that the mixed liquid can be input into the reaction tube for offline liquid phase doping, and the Er and Yb contents in the mixed liquid in each reaction tube are consistent, thereby ensuring the adsorption efficiency and adsorption amount, improving the quality of subsequent preforms, and saving the use of mixed liquid and reducing resource waste.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model is a single-mode mother rod reaction tube based on an erbium-doped optical fiber preform, comprising a base tube body and two feed end tubes, wherein a barrier layer and a loose core layer are sequentially arranged in the base tube body;

[0008] The sides of both ends of the base tube are provided with clamping grooves;

[0009] One end of the feed end pipe is provided with a joint end, and the other end of the feed end pipe is connected with a positioning end sleeve, and a positioning gasket is provided in the positioning end sleeve near the end pipe, and the positioning gasket is a soft sealing gasket, and a clamping ring is fixed on the inner wall of the positioning end sleeve;

[0010] The end of the base tube body is coaxially arranged in the positioning end sleeve, the end of the base tube body is connected with the positioning end sleeve by a clamping groove and a clamping ring body, and the end of the base tube body is pressed on the positioning gasket ring;

[0011] The side surface of the positioning end sleeve is annularly provided with a plurality of dividing grooves, and a movable end is formed between two adjacent dividing grooves. The clamping ring body is divided into a plurality of parts and is respectively arranged on the inner walls of the plurality of movable ends.

[0012] Furthermore, the two feed end tubes are divided into a feed end and a discharge end connected to the two ends of the base tube body, and the feed end tubes of the feed end are input with doped mixed liquid or dehydrated mixed gas.

[0013] Furthermore, a conical sleeve is fixed inside the positioning end sleeve, the small-mouth end of the conical sleeve is concentrically connected to the feed end pipe, and the positioning gasket is fixed at a position between the conical sleeve and the positioning end sleeve.

[0014] Furthermore, the thickness of the clamping ring body is smaller than the thickness of the base tube body, and the clamping ring body is clearance-matched with the clamping groove.

[0015] Furthermore, the inner wall of the positioning end sleeve is consistent with the outer diameter of the base tube body, and an inner guide slope is provided on the inner side of one end of the positioning end sleeve away from the feed end tube.

[0016] Furthermore, a valve body is provided on the feed end pipe.

[0017] The utility model has the following beneficial effects:

[0018] The utility model is designed to install the feed end tubes at both ends of the reaction tube, so as to seal the reaction tube, input and output liquid and gas, so that the mixed liquid can be input into the reaction tube for offline liquid phase doping, and the Er and Yb contents in the mixed liquid in each reaction tube are consistent, thereby ensuring the adsorption efficiency and adsorption amount, improving the quality of subsequent preformed rods, and saving the use of the mixed liquid and reducing resource waste.

[0019] 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

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1This is a schematic structural diagram of a single-mode mother rod reaction tube based on an erbium-doped optical fiber preform of the utility model;

[0022] Figure 2 It is a structural cross-sectional view of the end portion of the utility model;

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1-base tube body, 2-barrier layer, 3-loose core layer, 4-feeding end tube, 101-card slot, 401-valve body, 402-positioning end sleeve, 403-positioning gasket, 404-card ring body, 405-dividing groove, 406-conical sleeve, 407-inner guide slope. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-2 As shown, the utility model is a single-mode mother rod reaction tube based on an erbium-doped optical fiber preform, comprising a base tube body 1 and two feed end tubes 4, wherein a barrier layer 2 and a loose core layer 3 are sequentially arranged in the base tube body 1;

[0027] The base tube body 1 is provided with a clamping groove 101 on both ends of the peripheral side surface;

[0028] A joint end is provided at one end of the feed end pipe 4, and a positioning end sleeve 402 is connected to the other end of the feed end pipe 4. A positioning gasket 403 is provided in the positioning end sleeve 402 near the end pipe. The positioning gasket 403 is a soft sealing gasket. A clamping ring 404 is fixed to the inner wall of the positioning end sleeve 402.

[0029] The end of the base tube body 1 is concentrically arranged in the positioning end sleeve 402, and the end of the base tube body 1 is connected with the positioning end sleeve 402 by the clamping groove 101 and the clamping ring body 404, and the end of the base tube body 1 is pressed on the positioning gasket 403;

[0030] The positioning end sleeve 402 is provided with a plurality of dividing grooves 405 in an annular shape on its side surface, and a movable end is formed between two adjacent dividing grooves 405 . The clamping ring body 404 is divided into a plurality of parts and is respectively arranged on the inner walls of the plurality of movable ends.

[0031] The two feed end tubes 4 are divided into a feed end and a discharge end connected to the two ends of the base tube body 1 , and the feed end tube 4 at the feed end is input with a doped mixed liquid or a dehydrated mixed gas.

[0032] Among them Figure 2 As shown, a conical sleeve 406 is fixed inside the positioning end sleeve 402 , the small end of the conical sleeve 406 is concentrically connected to the feed end pipe 4 , and the positioning gasket 403 is fixed between the conical sleeve 406 and the positioning end sleeve 402 .

[0033] Among them Figure 1-2 As shown, the thickness of the clamping ring body 404 is smaller than the thickness of the base tube body 1 , and the clamping ring body 404 and the clamping groove 101 are clearance-matched.

[0034] Among them Figure 1-2 As shown, the inner wall of the positioning end sleeve 402 is consistent with the outer diameter of the base tube body 1, and an inner guide slope 407 is provided on the inner side of the end of the positioning end sleeve 402 away from the feeding end tube 4.

[0035] Among them Figure 1-2 As shown, a valve body 401 is provided on the feed end pipe 4.

[0036] The working principle of the utility model is as follows: after the barrier layer 2 and the loose core layer 3 are deposited in the base tube body 1, the feed end tubes 4 are installed at both ends, and a mixed solution of ErCl3 and YbCl3 is input through one feed end tube 4, and the valve body 401 of the other feed end tube 4 is in an open state for exhaust. When the internal liquid is full, the valve bodies 401 of the two feed end tubes 4 are closed, and Er and Yb are uniformly adsorbed on the loose core layer 3 by immersion at room temperature. After the adsorption is completed, the liquid is discharged through one feed end tube 4 and transferred to the drying and dehydration station. The two feed end tubes 4 are one for gas supply and the other for exhaust (the gas is high-purity chlorine and oxygen). After dehydration and drying, the feed end tubes 4 are removed and reused.

[0037] 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 utility model. 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.

[0038] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model 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 utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A single-mode mother rod reaction tube based on an erbium-doped optical fiber preform, comprising a base tube body (1), wherein a barrier layer (2) and a loose core layer (3) are sequentially arranged in the base tube body (1), characterized in that: Also includes two feed end pipes (4); The base tube body (1) is provided with clamping grooves (101) on the circumferential side surfaces at both ends; One end of the feed end pipe (4) is provided with a joint end, and the other end of the feed end pipe (4) is connected to a positioning end sleeve (402). A positioning gasket (403) is provided inside the positioning end sleeve (402) near the end pipe. The positioning gasket (403) is a soft sealing gasket. A clamping ring (404) is fixed to the inner wall of the positioning end sleeve (402); The end of the base tube body (1) is coaxially arranged in the positioning end sleeve (402), the end of the base tube body (1) is clamped and connected with the positioning end sleeve (402) through the clamping groove (101) and the clamping ring body (404), and the end of the base tube body (1) is pressed on the positioning gasket (403); The circumferential side surface of the positioning end sleeve (402) is provided with a plurality of dividing grooves (405) in an annular shape, and a movable end is formed between two adjacent dividing grooves (405). The clamping ring body (404) is divided into a plurality of parts and is respectively arranged on the inner walls of the plurality of movable ends.

2. The single-mode mother rod reaction tube based on erbium-doped optical fiber preform according to claim 1, characterized in that: The two feed end tubes (4) are divided into a feed end and a discharge end and are connected to the two ends of the base tube body (1); the feed end tubes (4) at the feed end are input with a doping mixed liquid or a dehydrated mixed gas.

3. The single-mode mother rod reaction tube based on erbium-doped optical fiber preform according to claim 1, characterized in that: A conical sleeve (406) is fixed inside the positioning end sleeve (402), the small-mouth end of the conical sleeve (406) is coaxially connected to the feed end pipe (4), and the positioning gasket (403) is fixed between the conical sleeve (406) and the positioning end sleeve (402).

4. The single-mode mother rod reaction tube based on erbium-doped optical fiber preform according to claim 1, characterized in that: The thickness of the clamping ring body (404) is smaller than the thickness of the base tube body (1), and the clamping ring body (404) is clearance-matched with the clamping groove (101).

5. The single-mode mother rod reaction tube based on erbium-doped optical fiber preform according to claim 1, characterized in that: The inner wall of the positioning end sleeve (402) is consistent with the outer diameter of the base tube body (1), and an inner guide slope (407) is provided on the inner side of one end of the positioning end sleeve (402) away from the feed end tube (4).

6. The single-mode mother rod reaction tube based on erbium-doped optical fiber preform according to claim 1, characterized in that: The feed end pipe (4) is provided with a valve body (401).

Images