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Heterogeneous segmented cladding large-mode field single-mode optical fiber

A technology of single-mode fiber and segmented package, which is applied in the direction of cladding fiber, multi-layer core/cladding fiber, etc. It can solve the problems of high optical power loss coefficient, difficult to exceed 50 microns, difficult to prepare, etc., and achieve fiber parameters Flexible design, flexible adjustment of fiber core diameter, and controllable leakage loss

Inactive Publication Date: 2018-07-27
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Large-mode field single-mode fiber has always been a research hotspot in the field of optical fiber. At present, the core diameter of commercial large-mode field single-mode fiber does not exceed 30 microns, and the large-mode field single-mode fiber with a core diameter greater than 100 microns generally has a complex structure. , it is difficult to prepare, the price is very expensive, and it is difficult to use on a large scale; although the gain-guiding-refractive index anti-guiding fiber has a large mode field diameter, the optical power loss coefficient is too high due to the leakage loss
Although it is simple to design a large mode field fiber by the V square parameter of the fiber, due to the limitation of the physical limit of the fiber material, the maximum core diameter is difficult to exceed 50 microns, which is far from meeting the development needs of the current fiber laser technology.

Method used

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  • Heterogeneous segmented cladding large-mode field single-mode optical fiber
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the fiber core 1, the first cladding layer 2 and the second cladding layer 3 are all made of phosphate glass material, the fiber core is doped with Yb3+, the wavelength of the emitted laser light is 1.064 μm, the fiber core 1, the first cladding layer 2 and the refractive index of the second cladding layer 3 are n 1 , n 2 and n 3 , and satisfy the relation: n 3 ≤n 1 2 , the diameter of the core 1 is 50 microns, the ratio of the radius of the first cladding 2 and the second cladding 3 to the core 1 is 2:1, and the number of the first cladding 2 and the second cladding 3 is 3 respectively , and the proportion of the circumference around the core 1 is the same, and the phases are symmetrically distributed. The leakage loss coefficient of the high-order mode is large, the higher the mode order is, the larger the leakage loss coefficient is, and the leakage loss coefficient of the fundamental mode is the smallest. When the gain coefficient of the core 1 is ...

Embodiment 2

[0021] Example 2, the core 1, the first cladding 2 and the second cladding 3 are all made of germanate glass material, the core is doped with Tm3+, the wavelength of the emitted laser light is 2.0 μm, and the first cladding 2 is made of photonic crystal The principle of optical fiber design is that a series of air holes are regularly arranged in the first cladding 2, but the air holes are filled with a high refractive index glass material, so that the effective refractive index of the first cladding 2 is higher than that of the core. The second cladding 3 also adopts the principle of photonic crystal fiber design, and a series of air holes are regularly arranged in the second cladding 3, so that the effective refractive index of the second cladding 3 is lower than that of the fiber core. The diameter of the core 1 is 100 microns, the ratio of the radius of the first cladding 2 and the second cladding 3 to the core 1 is 3:1, and the number of the first cladding 2 and the second ...

Embodiment 3

[0022] Embodiment 3, the fiber core 1, the first cladding layer 2 and the second cladding layer 3 are all made of quartz material, the fiber core is not doped, has no optical power gain characteristics, the fiber core 1, the first cladding layer 2 and the second cladding layer The refractive index of the cladding layer 3 is n 1 , n 2 and n 3 , and satisfy the relation: n 3 ≤n 1 2, the diameter of the core 1 is 50 microns, the ratio of the radius of the first cladding 2 and the second cladding 3 to the core 1 is 4:1, and the numbers of the first cladding 2 and the second cladding 3 are 3 respectively , and the proportion of the circumference around the core 1 is the same, and the phases are symmetrically distributed. The leakage loss coefficient of the high-order mode is large, the higher the order of the mode is, the larger the leakage loss coefficient is, and the leakage loss coefficient of the fundamental mode is the smallest. When the light is coupled from one end of th...

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Abstract

The invention relates to a heterogeneous segmented cladding large-mode field single-mode optical fiber, and provides a brand-new large-mode-field single-mode optical fiber. The cladding of the opticalfiber is composed of two materials. The refractive index of one material of the cladding is smaller than that of the material of a fiber core, and the light in the fiber core is totally reflected onthe interface of the fiber core and the cladding. In this way, the leakage of optical signals is avoided. The refractive index of the other material of the cladding is larger than that of the materialof the fiber core, and the light in the fiber core cannot be totally reflected on the interface of the fiber core and the cladding. In this way, optical signals in the fiber core can leak into the cladding. According to the invention, the technical scheme of the invention is applicable to optical fibers different in material and different in light-emitting wavelength. Meanwhile, the parameters ofoptical fibers are flexibly designed, and the leakage loss of optical fibers is controllable. The diameter of the fiber core can be flexibly adjusted and the preparation method is relatively simple.As a result, the invention provides a better solution for the large-mode field single-mode optical fiber.

Description

technical field [0001] The invention relates to a heterogeneous segmented cladding large-mode-field single-mode optical fiber, which belongs to the technical field of special optical fibers. Background technique [0002] Large-mode field single-mode fiber has always been a research hotspot in the field of optical fiber. At present, the core diameter of commercial large-mode field single-mode fiber does not exceed 30 microns, and the large-mode field single-mode fiber with a core diameter greater than 100 microns generally has a complex structure. , is difficult to prepare, the price is very expensive, and it is difficult to use on a large scale; although the gain-guiding-refractive index anti-guiding fiber has a large mode field diameter, the optical power loss coefficient is too high due to the leakage loss. Although it is simple to design a large mode field fiber by the V square parameter of the fiber, due to the limitation of the physical limit of the fiber material, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036
CPCG02B6/036
Inventor 沈骁韦玮
Owner NANJING UNIV OF POSTS & TELECOMM