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cladding structure of an optical fiber

A technology of cladding and optical fiber, which is applied in the field of optical fiber, can solve the problems of limited shape control ability, cumbersome process, and inability to guarantee the quality and accuracy of light guide mode spot quality, etc., and achieve strong shape control ability, improve beam quality and power, and improve The effect of the degree of mode field constraint

Active Publication Date: 2021-03-19
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects in the manufacturing process of the existing optical fiber cladding in the background technology, such as cumbersome process, limited shape control ability, light guide mode and spot quality accuracy cannot be guaranteed, the present invention provides a cladding structure of optical fiber

Method used

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Embodiment 1

[0038] Such as figure 1 and 2 As shown, a cladding structure of an optical fiber includes a cylindrical matrix 1 (fiber core); the outer surface of the cylindrical matrix 1 is etched with a microstructure by laser direct writing (in this embodiment, femtosecond laser direct writing is used) mode); in this embodiment, the microstructure includes N micro-shaped hole groups arranged along the axial direction (light transmission direction), and each micro-shaped hole group includes M micro-shaped blind holes 2 arranged along the circumferential direction, wherein N > 1; M > 3; such as figure 1 Shown, in the present embodiment, micro-shaped blind hole 2 is cylindrical (namely from figure 1 Looking at the A direction, it is a circle), the pore diameter ranges from 2-5um, and the value range of the ratio of the pore depth to the pore diameter is 1:10-50:1.

Embodiment 2

[0040] Such as image 3 and Figure 4 As shown, a cladding structure of an optical fiber includes a cylindrical matrix 1 (fiber core); the outer surface of the cylindrical matrix 1 is etched with a microstructure by laser direct writing (in this embodiment, femtosecond laser direct writing is used) mode); in the present embodiment, the microstructure includes N micro-shaped hole groups arranged in the axial direction (light transmission direction), and each micro-shaped hole group includes M micro-shaped blind holes 2 arranged in the circumferential direction, wherein N > 1; M > 3; In the present embodiment, the micro-shaped blind hole 2 is an inverted truncated cone (that is, from image 3 Looking at the direction B, it is two concentric circles), the value range of the small end hole is 1-2um, the value range of the large end hole diameter is 2-10um, and the maximum hole depth is 100um.

Embodiment 3

[0042] Such as Figure 5 and Figure 6 As shown, a cladding structure of an optical fiber comprises a cylindrical matrix 1 (core); ); in this embodiment, the microstructure includes N micro-shaped hole groups arranged in the axial direction (light transmission direction), and each micro-shaped hole group includes M micro-shaped blind holes 2 arranged in the circumferential direction, where N> 1; M>3; In the present embodiment, the micro-shaped blind hole 2 is inverted conical (that is, from Figure 5 Looking at the C direction, it is round), and the diameter of the large end (that is, the opening) ranges from 1-10um; the maximum hole depth is 100um.

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Abstract

The invention discloses a cladding structure of an optical fiber. The cladding structure comprises a cylindrical base body. A microstructure is etched on the outer surface of the cylindrical base bodyin a laser direct writing mode. The microstructure comprises N micro-hole groups arranged in the axial direction. Each micro-hole group comprises M micro-blind holes arranged in the circumferential direction, and N>1 and m>3. According to the constructed cladding structure, the shape control capability is relatively high, the number of modes can be reduced, the mode field constraint degree of light is improved and the beam quality and power of laser are improved.

Description

technical field [0001] The invention relates to an optical fiber, in particular to a cladding structure of an optical fiber. Background technique [0002] The optical fiber cladding is one of the three major components of the optical fiber. The core and the cladding form the most basic optical fiber structure. The transmission principle of the optical fiber is to form total reflection between the core and the cladding. The design of the optical fiber cladding directly determines the loss of light energy transmission and the control of the spot mode, so the design of the optical fiber cladding is the most critical step in the optical fiber. [0003] At present, the following methods are mainly used for the manufacture of optical fiber cladding: [0004] Including MCVD (improved chemical vapor deposition), PCVD (plasma introduced chemical vapor deposition), OVD external vapor deposition method and VAD vapor phase axial deposition method; the above four methods are to deposit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02
CPCG02B6/02295
Inventor 李珣李明刘红军谭羽
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI