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Stress-induced high birefringence ultra-large mode field photonic crystal fiber

A technology of photonic crystal fiber and high birefringence, which is applied in polarizing fiber, cladding fiber, optical waveguide and light guide, etc. It can solve the problem that photonic crystal fiber is difficult to achieve fiber single-mode transmission and high birefringence polarization-maintaining photonic crystal fiber and other problems, to achieve the effect of easy operation and increasing the limit loss ratio

Active Publication Date: 2022-08-05
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the technical problem that photonic crystal fiber is difficult to realize the single-mode transmission of ultra-large mode field area fiber, and it is difficult to realize the polarization-maintaining photonic crystal fiber with high birefringence value under the condition of large mode field area transmission. Realization of high birefringence ultra-large mode field photonic crystal fiber

Method used

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  • Stress-induced high birefringence ultra-large mode field photonic crystal fiber
  • Stress-induced high birefringence ultra-large mode field photonic crystal fiber
  • Stress-induced high birefringence ultra-large mode field photonic crystal fiber

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Embodiment 1

[0088] The 19 air holes are replaced by the fiber core 1, the high-order mode filtering structure 5 is added, and the stress material introduced in the stress zone 6 is a boron rod. The photonic crystal fiber structure is as follows figure 1 shown.

[0089] 1) PCF fiber structure parameters:

[0090] Air hole diameter d=1~5μm, hole spacing Λ=14.5~25μm, d / Λ=0.04~0.5; fiber core 1 replaces three layers of air holes, that is, silica with 19 air holes; Edge shape, no gaps in the fiber arrangement when the fiber is drawn, the edge is equal to 5 / 2Λ, and the core diameter is 5.5Λ;

[0091] The air hole cladding around the fiber core 1 has five layers of air holes 2, the cladding substrate 3 is silicon dioxide, and the air holes 2 are in a triangular lattice structure; the air hole cladding is added with a high-order mode filtering structure 5, and the high-order mode filtering structure The filter structure 5 is composed of a plurality of annular structures 51 outside the air holes...

Embodiment 2

[0111] The 19 air holes are replaced by the fiber core 1, and the stress material introduced in the stress region 6 is a boron rod. The photonic crystal fiber structure is as follows Image 6 shown.

[0112] 1) PCF fiber structure parameters:

[0113] Air hole diameter d=1~5μm, hole spacing Λ=14.5~25μm, d / Λ=0.04~0.5; fiber core 1 replaces three layers of air holes, that is, silica with 19 air holes; Edge shape, the fiber is arranged without gaps when the fiber is drawn, the edge is equal to 5 / 2Λ, and the core diameter is 5.5Λ;

[0114] The air hole cladding around the fiber core 1 has five layers of air holes 2, the cladding substrate 3 is silicon dioxide, and the air holes 2 are in a triangular lattice structure;

[0115] The boron rod introduced into the stress zone 6 in the air hole cladding includes a boron rod core and a quartz outer layer. The diameter of the boron rod core is D=12-15 μm. The larger the number of boron rods, the better the polarization-maintaining effe...

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Abstract

The invention relates to a photonic crystal fiber, in particular to a stress-induced high birefringence ultra-large mode field photonic crystal fiber to solve the problem that the photonic crystal fiber is difficult to achieve single-mode transmission of an ultra-large mode field area fiber, and under the condition of large mode field area transmission Difficult technical problems in realizing polarization-maintaining photonic crystal fibers with high birefringence values. Including fiber core, air hole cladding, perfect matching layer, and high-order mode filtering structure and stress area set in the air hole cladding; the fiber core replaces 19 air hole positions in the structure; air holes in the air hole cladding Satisfy between: d / Λ=0.04~0.5; the high-order mode filtering structure includes a plurality of annular structures arranged outside the corresponding air holes; two stress zones distributed symmetrically with respect to the fiber core are provided, and each stress zone is composed of It consists of m boron rods. The photonic crystal fiber of the present invention can realize single-mode transmission in an ultra-large mode field area with a mode field diameter ≥ 60 μm, and realize a birefringence value > 10 ‑4 order of magnitude performance.

Description

technical field [0001] The invention relates to a photonic crystal fiber, in particular to a stress-induced high birefringence ultra-large mode field photonic crystal fiber. Background technique [0002] Conventional circularly symmetric fibers do not maintain the polarization state of the guided modes along their length. Although nominally isotropic, small twists, bends, and other stresses impose unknown and uncontrollable birefringence on the fiber, so the polarization of the fiber output is unpredictable. In the fiber manufacturing process, strong birefringence is deliberately introduced to achieve high birefringence values, making the fiber more controllable to these environmental factors. For traditional polarization maintaining fiber, although its birefringence value can reach higher than 10 -4 The order of magnitude, but its single-mode mode field diameter is too small to meet the requirements of high-power fiber lasers. [0003] Compared with traditional optical f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/024G02B1/00
CPCG02B6/02014G02B6/02009G02B6/02342G02B6/02357G02B6/024G02B1/005
Inventor 马园王鹏飞彭波
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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