A low nonlinear coefficient few-mode fiber with a depressed index cladding

A nonlinear coefficient, few-mode fiber technology, applied in the direction of multi-layer core/clad fiber, clad fiber, optical waveguide light guide, etc., to achieve large effective mode field area, low nonlinear coefficient, high mode field density. Effect

Active Publication Date: 2020-09-25
LIAOCHENG UNIV
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Problems solved by technology

A supermode fiber with multiple solid cores and strong coupling has also attracted everyone's attention; the multi-solid core supermode fiber essentially has a larger effective mode field area, high mode field density, low mode-dependent loss, low mode coupling and Few-mode fibers with low differential mode group delay[Cen Xia, Neng Bai, Ibrahim Ozdur, et al., Supermodes for opticaltransmission, Optics Express, 2011, 19(17):16653-16664; Cen Xia, Neng Bai, Rodrigo Amezcua -Correa, et al., Supermodes in strongly-coupled multi-corefibers, OFC 2013, OTh3K.5]; in summary, in order to reduce the nonlinear coefficient of the fiber, increasing the effective mode field area of ​​the fiber is also the method An effective solution for optical fiber; one of the research challenges of few-mode fiber is to achieve a large effective mode field area with a wide bandwidth and few-mode operation with low nonlinear coefficient

Method used

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  • A low nonlinear coefficient few-mode fiber with a depressed index cladding
  • A low nonlinear coefficient few-mode fiber with a depressed index cladding
  • A low nonlinear coefficient few-mode fiber with a depressed index cladding

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Embodiment 1

[0019] Example 1 figure 1It is a cross-sectional schematic diagram of a low nonlinear coefficient few-mode optical fiber with a depressed refractive index cladding of the present invention; the optical fiber is composed of a pure silica matrix and three annular cores with a slightly larger refractive index; the three annular The cores have the same size, and the adjacent intervals are very small; the inner circle radius of the three ring cores is R1=R3=R5=5.25E-6 m, and the outer circle radius is R2=R4=R6=1.05E-5 m; R7=3E -5 m, R8=5E-5 m, R9=1.1E-4 m; the center coordinate of the left ring core is (-9.31E-6 m, 0), and the center coordinate of the upper right ring core is (9.31E- 6 m, 1.075E-5 m), the coordinates of the center of the lower right ring core are (9.31E-6m, -1.075E-5 m); the refractive index of the three ring cores is =1.445468, the refractive index cladding of pure silica =1.444024; between R7 and R8 is a depressed refractive index cladding, whose refractive i...

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Abstract

The present invention proposes a low nonlinear coefficient few-mode optical fiber with a depressed refractive index cladding, which realizes supermode operation with large effective mode field area, low nonlinear coefficient, high mode field density, and low differential mode group delay; and The nonlinear coefficient and differential mode group delay are flat in the C-band range; the mode field characteristics of the supermode in the fiber can be changed by changing the size, position and refractive index distribution of the ring; it can be applied to fiber optics, fiber optic communications, fiber optics Wireless access, optical information processing and new generation information technology and other fields.

Description

technical field [0001] The invention relates to a low nonlinear coefficient few-mode optical fiber with a depressed refractive index cladding, which can be applied to fields such as optical fiber optics, optical fiber communication, optical fiber wireless access, optical information processing, and new generation information technology. Background technique [0002] In recent years, the traffic of various communication services has increased exponentially, and single-mode optical fiber communication has encountered unprecedented challenges. The optical fiber communication industry has achieved breakthroughs in the transmission capacity of communication networks around the physical dimension of space division multiplexing (including core multiplexing and mode division multiplexing and their combination); research on multi-core optical fibers and few-mode optical fibers in space division multiplexing Become a frontier research hotspot [Guifang Li, Neng Bai, and Ningbo Zhao and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036
Inventor 于如愿郑宏军黎昕白成林胡卫生
Owner LIAOCHENG UNIV
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