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CN-121386078-B - Hollow fiber body end face sealing structure, sealing device and sealing method

CN121386078BCN 121386078 BCN121386078 BCN 121386078BCN-121386078-B

Abstract

The application belongs to the field of optical fiber manufacturing, and particularly discloses an end face sealing structure, a sealing device and a sealing method of an air-core optical fiber body, wherein the sealing structure is arranged on the end face of the air-core optical fiber body and comprises a connecting layer and a sealing layer which are sequentially arranged, the connecting layer is a silane coupling agent molecular layer, one side surface of the connecting layer is in covalent bonding with a silicon hydroxyl group of the end face through a siloxane bond, the other side surface of the connecting layer is provided with an active functional group, the sealing layer is an organic sealing adhesive layer, the organic sealing adhesive layer is provided with an active functional group, and the active functional group of the organic sealing adhesive layer and the active functional group of the other side surface of the connecting layer form chemical bonding. Through the structural design of the application, the sealant can enter the hollow fiber body to a certain depth under the action of pressure and form a flat sealing layer on the end face to be sealed, so that the compactness and the adhesive strength of the sealing layer on the end face of the hollow fiber body are effectively improved, and the sealing quality is improved.

Inventors

  • HU HAIFENG
  • TANG SIYI
  • RUAN YUNFANG
  • HU YULONG
  • YANG XIANGRONG
  • QI LIN
  • ZHANG LEI
  • LI PENG
  • ZHAN HAO

Assignees

  • 长飞光纤光缆股份有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (7)

  1. 1. The hollow fiber body end face sealing structure is arranged on the end face of the hollow fiber body (5) and is characterized by comprising a connecting layer (61) and a sealing layer (62) which are sequentially arranged; The connecting layer (61) is a silane coupling agent molecular layer, one side surface of the connecting layer (61) is in covalent bonding with a silicon hydroxyl group of the end surface through a siloxane bond, and the other side surface of the connecting layer (61) is provided with an active functional group; The sealing layer (62) is an organic sealing adhesive layer, the organic sealing adhesive layer is provided with a reactive functional group, and the reactive functional group of the organic sealing adhesive layer and the reactive functional group on the other side surface of the connecting layer (61) form chemical bonding; The hollow fiber body (5) is hollow, and the sealing layer (62) extends to the inside of the hollow fiber body (5) and has an extending depth of at least 5mm.
  2. 2. A sealing device for an end face of a hollow fiber body for preparing the sealing structure according to claim 1, comprising: the clamping module (1) is used for fixing the hollow fiber body (5) and the end face (51) to be sealed; the pressurizing module (2) is detachably connected and matched with the clamping module (1), and when the clamping module (1) and the pressurizing module (2) are connected and matched, a sealed pressurizing cavity (3) is formed between the clamping module (1) and the pressurizing module (2), and the end face (51) to be sealed is exposed in the pressurizing cavity (3); the pressurizing module (2) is provided with a pressurizing interface (21) communicated with the pressurizing cavity (3), and pressurizing medium is led into the pressurizing cavity (3) through the pressurizing interface (21) so as to pressurize the sealant coated on the end face (51) to be sealed; the clamping module (1) comprises: a clamping part (11) for fixing the hollow fiber body (5); And the molding part (12) is connected to the clamping part (11) and is provided with a flat reference surface (121), the reference surface (121) is coated with an anti-sticking coating, and when the hollow fiber body (5) is fixed, the end surface (51) to be sealed is kept flush with the reference surface (121) so that the sealant coated on the end surface (51) to be sealed can be molded by taking the reference surface (121) as a boundary.
  3. 3. A sealing device for an end face of a hollow fiber body according to claim 2, wherein the holding portion (11) is provided with a plurality of fiber positioning grooves (111) for holding a plurality of hollow fiber bodies (5) at the same time.
  4. 4. A sealing device for an end face of a hollow fiber body according to claim 2, wherein the pressurizing module (2) is provided with a pressurizing groove (22), and the forming part (12) is in threaded connection with the pressurizing groove (22) to form the pressurizing chamber (3).
  5. 5. A method for sealing an end face of a hollow fiber body using the sealing device according to any one of claims 2 to 4, comprising the steps of: S1, after pretreatment of an end face (51) to be sealed of an hollow optical fiber body (5), fixing the hollow optical fiber body (5) by adopting a clamping module (1), coating liquid sealant on the end face (51) to be sealed, and then scraping the liquid sealant; S2, butt-jointing the pressurizing module (2) and the clamping module (1) to form a pressurizing cavity (3), and exposing the end face (51) to be sealed, coated with the liquid sealant, into the pressurizing cavity (3); And S3, introducing a pressurizing medium into the pressurizing cavity (3) through the pressurizing interface (21), and pressurizing the liquid sealant on the end face (51) to be sealed, so that a sealing layer is formed inside the end face (51) to be sealed and the hollow fiber body (5).
  6. 6. A method for sealing an end face of a hollow fiber body according to claim 5, wherein the pretreatment in step S1 comprises the steps of flattening and plasma cleaning the end face (51) to be sealed of the hollow fiber body (5), coating a silane coupling agent on the end face (51) to be sealed and heating, wherein the heating treatment is performed at a temperature of 100 ℃ to 120 ℃ for a time of 10min to 30min.
  7. 7. A method for sealing an end face of a hollow fiber body as set forth in claim 5, further comprising performing steps S1 to S3 a plurality of times, and then curing the sealing layer to seal the end face (51) to be sealed.

Description

Hollow fiber body end face sealing structure, sealing device and sealing method Technical Field The application belongs to the field of optical fiber manufacturing, and particularly relates to a hollow optical fiber body end face sealing structure, a sealing device and a sealing method. Background Hollow core optical fibers are an advanced optical waveguide technology whose core feature is that the optical signal is transmitted mainly in the core, which is made of air, instead of in a conventional solid glass material. Hollow core fibers no longer rely on the principle of "total internal reflection" but instead transmit light confined within an air channel by a precise microstructure in the cladding. Typical implementations include photonic band gap fibers that utilize the photonic band gap effect, as well as anti-resonant microstructured fibers based on the principle of anti-resonant reflection. The hollow fiber can significantly reduce the signal transmission delay by about 30% and reduce the signal attenuation due to faster propagation speed and lower loss of light in air. Therefore, hollow fiber is regarded as a key technical direction for solving the bottleneck problems in the fields of high-speed communication, high-power laser transmission and the like in the future. However, the end face of the hollow fiber is vulnerable to environmental pollution, and is a main way for water vapor and impurities to enter the hollow channel inside the fiber, once the water vapor and impurities enter the hollow channel inside, the transmission of optical signals can be seriously disturbed, the water vapor and impurities can lead to the rapid increase of the attenuation of the optical signals through strong absorption and scattering, and the stability of the transmission and the quality of the light beams are seriously deteriorated by introducing time-varying loss and wave front distortion. Thus, it is desirable to seal the end face of the hollow core optical fiber with a reliable closure. But often challenges are faced in the actual sealing of the end faces of hollow core fibers because the hollow core fibers are only on the order of microns in diameter. For example, when the end face of the hollow optical fiber is plugged by using a sealant, air bubbles are easily generated in the coating process, the coating is incomplete or adhesion cannot be realized, and the defects are difficult to directly observe by naked eyes. In addition, the thermal bonding strength between the sealant and the glass material is insufficient, the thermal expansion coefficients of the sealant and the glass material are not matched, gaps are easily generated due to inconsistent shrinkage when the temperature is changed, and finally the end face seal is invalid. Disclosure of Invention Aiming at the defects of the prior art, the application provides a sealing structure, a sealing device and a sealing method for the end face of a hollow optical fiber body, and aims to solve the problems that the end face of the hollow optical fiber is sealed by sealant in the prior art, such as bubbles, incomplete coating, insufficient adhesive force and the like, so that the quality of the sealing structure is poor, and the sealing effect of the end face is affected. The application provides an end face sealing structure of a hollow fiber body, which is arranged on the end face of the hollow fiber body and comprises a connecting layer and a sealing layer which are sequentially arranged; The connecting layer is a silane coupling agent molecular layer, one side surface of the connecting layer is in covalent bonding with the silicon hydroxyl of the end face through siloxane bonds, and the other side surface of the connecting layer is provided with an active functional group; The sealing layer is an organic sealing adhesive layer, the organic sealing adhesive layer is provided with an active functional group, and the active functional group of the organic sealing adhesive layer and the active functional group on the other side surface of the connecting layer form chemical bonding. As a further preferred aspect, the hollow fiber body is hollow inside, and the sealing layer extends into the hollow fiber body to a depth of at least 5mm. The application provides a sealing device for an end face of a hollow fiber body, which is used for preparing the sealing structure and specifically comprises the following steps: the clamping module is used for fixing the hollow fiber body and the end face to be sealed; the pressurizing module is detachably connected and matched with the clamping module, and when the clamping module and the pressurizing module are connected and matched, a sealed pressurizing cavity is formed between the clamping module and the pressurizing module, and the end face to be sealed is exposed in the pressurizing cavity; the pressurizing module is provided with a pressurizing interface communicated with the pressurizing cavity, and pressurizing medium is l