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Layered doping-based orbital angular momentum mode gain flat ring core optical fiber

A technology with orbital angular momentum and gain flatness, which can be applied to multi-layer core/clad fibers, clad fibers, multi-core fibers, etc., to solve the problem of difficulty in controlling the gain difference and achieve the effect of consistent gain

Active Publication Date: 2021-12-28
SUN YAT SEN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problem that the gain difference of different order modes in the above-mentioned prior art is difficult to control, the present invention provides a flat ring-core optical fiber with orbital angular momentum mode gain based on layered doping, so that the gain of each order mode tends to be consistent

Method used

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  • Layered doping-based orbital angular momentum mode gain flat ring core optical fiber
  • Layered doping-based orbital angular momentum mode gain flat ring core optical fiber
  • Layered doping-based orbital angular momentum mode gain flat ring core optical fiber

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Embodiment 1

[0025] Such as Figure 1-2 Shown is an embodiment of an orbital angular momentum mode gain flat ring-core fiber based on layered doping, including an inner core layer 1, a ring core layer 2, and a cladding layer 3 wrapped in sequence from the inside to the outside; the ring core layer 2 Doping with erbium ions, the ring core layer 2 is divided into at least two layers and the doping concentration of erbium ions in each layer is not consistent.

[0026] In this embodiment, the ring core layer 2 is divided into two layers, which are the first doped ring layer 201 and the second doped ring layer 202 from the inside to the outside; the first doped ring layer 201 and the second doped ring layer The erbium ion doping concentration ratio of layer 202 is (0.683 ± 0.02): 1; the inner ring radius r5 of the first doped ring layer 201, the outer ring radius r6 of the first doped ring layer 201 and the second doped ring layer The ratio of the outer ring radius r7 of 202 is (0.2642±0.02):(...

Embodiment 2

[0034] Embodiment 2 of a flat ring-core fiber based on layered doping OAM mode gain, such as Figure 4 As shown, the difference from Embodiment 1 is that the ring core layer 2 can also be divided into three layers, which are the first doped ring layer 201, the second doped ring layer 202 and the third doped ring layer from the inside to the outside. ; The erbium ion doping concentration ratio of the first doped ring layer 201, the second doped ring layer 202 and the third doped ring layer 203 is (0.315±0.02):(0.1518±0.02):(0.5357±0.02); The inner ring radius r5 of the first doped ring layer 201, the outer ring radius r6 of the first doped ring layer 201, the outer ring radius r7 of the second doped ring layer 202, and the outer ring radius of the third doped ring layer 203 The ratio between r8 is (0.194±0.02):(0.239±0.02):(0.269±0.02):(0.299±0.02), and the outer ring radius of the third doped ring layer 203 is 9 μm-11 μm.

[0035] Specifically, in this embodiment, r1=r5=6.5 μ...

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Abstract

The invention relates to a layered doping-based orbital angular momentum mode gain flat ring core fiber. The orbital angular momentum mode gain flat ring core fiber comprises an inner core layer, a ring core layer and a wrapping layer which are sequentially wrapped from inside to outside. Erbium ions are doped in the ring core layer, the ring core layer is divided into at least two layers, and the doping concentration of the erbium ions in each layer is different. The ring core layer is provided with at least two layers of erbium-doped ion areas with different concentrations, and by adjusting the ring core layer and the erbium ion doping concentration, the step ring core erbium-doped optical fiber can carry out balanced gain on the OAM modes with more orders in the optical fiber communication C wave band in the simultaneous amplification process. Meanwhile, the ring core layer is provided with erbium ion layers with different concentrations, so that the mode field distribution is further concentrated, the amplified mode is improved, erbium ions are utilized and excited more efficiently, and the mode gains of all orders tend to be consistent.

Description

technical field [0001] The invention relates to the field of optical fiber amplifiers, in particular to a flat ring-core optical fiber with orbital angular momentum mode gain based on layered doping. Background technique [0002] After decades of development, the existing single-mode optical fiber communication technology has a capacity of about 100 Tbit / s due to the limitation of nonlinear effects. How to further improve the communication capacity to meet the current rapidly growing demand for information interconnection has become a core issue in the research of optical fiber communication technology. Time division, wavelength division, polarization division multiplexing technology and multi-level orthogonal modulation technology make the capacity of single-mode fiber in large-capacity transmission systems quickly approach the Shannon theoretical limit. Space Division Multiplexing (SDM) can provide a new multiplexing dimension for future optical fiber capacity growth. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02042G02B6/02G02B6/03622G02B6/03638
Inventor 李朝晖温添金高社成涂佳静张斌
Owner SUN YAT SEN UNIV
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