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Microstructure optical fiber with large mode area

A technology of micro-structured optical fiber and large mode field, which is applied in the direction of cladding optical fiber, multi-layer core/clad optical fiber, optical waveguide and light guide, etc., which can solve the problems of increased manufacturing difficulty, low bending loss, and complex structure, and achieve structural Effects of simplicity, low bending loss, and low binding loss

Inactive Publication Date: 2012-12-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two holes with different periods and different sizes are used to achieve single-mode transmission with large mode field area and low bending loss, but the structure is more complicated, which increases the difficulty of production

Method used

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  • Microstructure optical fiber with large mode area
  • Microstructure optical fiber with large mode area
  • Microstructure optical fiber with large mode area

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The cross-sectional structure of the optical fiber is as figure 1 shown. The matrix material is pure quartz, and the hole material is doped quartz material. The pore period Λ of the cladding is 46 μm, and the pore diameter d of the first type of pore 2 2 is 42 μm. Hole diameter d of the second type of hole 3 and the third type of hole 4 3 and d 3 Both are 23 μm. The first type of hole 2, the second type of hole 3 and the third type of hole 4 have the same refractive index, which is 0.004 lower than that of the matrix material. When the transmission wavelength is 1064 nm, the fundamental mode field area in the straight fiber is greater than 1800 μm 2 , when the bending radius is 20 cm, the mode field area of ​​the fundamental mode reaches 1000 μm 2 -- above. When the bending radius of the optical fiber reaches 5 cm, the fundamental mode loss is still less than 0.01 dB / m. When the fiber is straight, its fundamental mode leakage loss is less than 0.01 dB / m, and i...

Embodiment 2

[0052] The cross-sectional structure of the optical fiber is as figure 2 shown. The matrix material is pure quartz, and the hole material is doped quartz material. The period Λ of the cladding pores is 46 μm, and the pore diameter d of the first type of pores 2 2 is 42 μm. Hole diameter d of the second type of hole 3 and the third type of hole 4 3 and d 4 Both are 23 μm, and the refractive index of the first type of hole 2, the second type of hole 3 and the third type of hole 4 is the same, which is 0.004 lower than that of the matrix material. Period Λ of the fourth type of hole 5 5 6 μm, hole diameter d 5 At 2 μm, the refractive index of the hole is 0.001 lower than that of the matrix material. When the transmission wavelength is 1064 nm, the fundamental mode field area of ​​the straight fiber can reach 1600 μm 2 above; when the fiber bending radius is 50 cm, the mode field area of ​​the fundamental mode is greater than 1500 μm 2 ; When the fiber bending radius is ...

Embodiment 3

[0054] The cross-sectional structure of the optical fiber is as figure 2 shown. The matrix material is pure quartz, and the hole material is doped quartz material. The period Λ of the cladding pores is 46 μm, and the pore diameter d of the first type of pores 2 2 is 42 μm. Hole diameter d of the second type of hole 3 and the third type of hole 4 3 and d 4 They are 28 μm and 23 μm respectively, and the refractive index of the first type of hole 2 , the second type of hole 3 and the third type of hole 4 is the same, which is 0.004 lower than that of the matrix material 1 . Period Λ of the fourth type of hole 5 5 6 μm, hole diameter d 5 At 2 μm, the refractive index of the hole is 0.002 lower than that of the matrix material. When the transmission wavelength is 1064 nm, the fundamental mode field area in straight fiber can reach 1200 μm 2 above. When the fiber bending radius is 15 cm, the mode field area of ​​the fundamental mode is still 1200 μm 2 above. When the fib...

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Abstract

The invention discloses a large mode field microstructure optical fiber, the optical fiber cladding consists of a matrix material (1) and two layers of holes, the fiber core is the area surrounded by the two layers of holes; the outer layer of the two layers of holes is a hole Composed of 12 third-type holes (4) whose centers are regular hexagons, the inner layer is 3 adjacent first-type holes (2) and 3 adjacent second-type holes whose centers are regular hexagons holes (3), the hole period Λ of the two layers of holes is equal, and satisfies d2>d3, d2>d4. The fiber uses holes of different diameters to bind the core mode, and uses larger holes to prevent light leakage when the fiber is bent, and uses smaller holes to effectively bind the fundamental mode of the fiber and remove high-order modes at the same time. The purpose of single mode, large mode field and low bending loss transmission is achieved.

Description

technical field [0001] The invention relates to the field of microstructured optical fibers, in particular to microstructured optical fibers with large mode field, low bending loss and single-mode operating characteristics. Background technique [0002] In the design of high-power fiber lasers and amplifiers, the mode field area of ​​the fiber is an important parameter. Increasing the mode field area of ​​the fiber can effectively reduce the nonlinear coefficient of the fiber, thereby increasing its output optical power. Generally, the basic requirements for large mode field fibers are: 1. Single-mode operation, which is a basic condition for high-performance lasers; 2. Large mode field area; 3. Low bending loss, that is, the fiber can allow a certain degree of bending, and Has low bending loss. Due to the manufacturing and performance reasons of traditional optical fibers, it is difficult to obtain single-mode optical fibers that work near 1064nm and have a core diameter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036G02B6/02
Inventor 陈明阳李裕蓉张永康
Owner JIANGSU UNIV
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