Microstructure optical fiber with large mode area

A technology of microstructured fiber and large mode field, applied in cladding fiber, multi-layer core/cladding fiber, optical waveguide light guide, etc. The effect of binding loss, simple structure, and low bending loss

Inactive Publication Date: 2012-03-07
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 fiber is as figure 1 Shown. The matrix material is pure quartz, and the hole material is doped quartz material. The hole period Λ of the cladding layer is 46μm, and the hole diameter d of the first type hole 2 2 It is 42 μm. Diameter d of the second type hole 3 and the third type hole 4 3 And d 3 Both are 23 μm. The refractive index of the first type hole 2, the second type hole 3 and the third type hole 4 are the same, which is 0.004 lower than that of the matrix material. When the transmission wavelength is 1064 nm, the fundamental mode field area in 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 -- the above. When the bending radius of the optical fiber reaches 5 cm, the fundamental mode loss is still less than 0.01 dB / m. In the case of straight fiber, the fundamental mode leakage loss is less than 0.01 dB / m, and the higher-order mode l...

Embodiment 2

[0052] The cross-sectional structure of the fiber is as figure 2 Shown. The matrix material is pure quartz, and the hole material is doped quartz material. The cladding hole period Λ is 46 μm, and the hole diameter d of the first type hole 2 2 It is 42 μm. Diameter d of the second type hole 3 and the third type hole 4 3 And d 4 Both are 23 μm. The refractive index of the first type hole 2, the second type hole 3 and the third type hole 4 are the same, which is 0.004 lower than 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 ​​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 30 cm, the mode field area of ​​the fundamental mode still ex...

Embodiment 3

[0054] The cross-sectional structure of the fiber is as figure 2 Shown. The matrix material is pure quartz, and the hole material is doped quartz material. The cladding hole period Λ is 46 μm, and the hole diameter d of the first type hole 2 2 It is 42 μm. Diameter d of the second type hole 3 and the third type hole 4 3 And d 4 Respectively 28 μm and 23 μm, the refractive index of the first type hole 2, the second type hole 3 and the third type hole 4 are 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 the above. When the fiber bending radius is 15 cm, the mode field area of ​​the fundamental mode is still 1200 μm 2 the above. In the case of straight fiber, the fundamental mode binding loss...

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Abstract

The invention discloses a microstructure optical fiber with a large mode area. An optical fiber cladding comprises a host material (1) and a two-layer hole; and a fiber core is an area that is surrounded by the two-layer hole. An external layer of the two-layer hole is composed of 12 third type holes (4), wherein centers of the holes are connected into a regular hexagon shape; and an inner layer of the two-layer hole is formed by three adjacent first type holes (2) and three adjacent second type holes (3), wherein the centers of the holes are connected into a regular hexagon shape. Besides, hole cycle lambdas of the two-layer hole are equal and simultaneously, the following relations are satisfied: d2 is larger than d3; and the d2 is larger than d4. According to the invention, holes with different diameters are employed by the optical fiber, so that a constraint is formed on a fiber core mode; and holes with large sizes are utilized to prevent light leakage during bending of the fiber; moreover, holes with small sizes are utilized to form an effective constraint on an optical fiber ground mode; and meanwhile, a high order mode is removed; therefore, an objective of realization of loss transmission with a single mode, a large mode field and low bending 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 Applications(China)
IPC IPC(8): G02B6/036G02B6/02
Inventor 陈明阳李裕蓉张永康
Owner JIANGSU UNIV
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