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Design method and application of equal group velocity differential few-mode fiber

A technology of few-mode optical fiber and design method, which is applied in cladding optical fiber, graded index core/cladding optical fiber, optics, etc., can solve problems such as inability to achieve time delay, and achieve the effect of uniform time delay

Inactive Publication Date: 2020-07-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary few-mode fibers cannot achieve uniform delay due to the difference in group velocity difference between modes.

Method used

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  • Design method and application of equal group velocity differential few-mode fiber
  • Design method and application of equal group velocity differential few-mode fiber
  • Design method and application of equal group velocity differential few-mode fiber

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Embodiment Construction

[0031] The design method of the equal-group-velocity-difference few-mode optical fiber of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0032] The design method of the equal group velocity difference few-mode optical fiber of the present invention, by designing the structure of the few-mode optical fiber with a parabolic refractive index distribution with ravines, by optimizing the structural parameters of the optical fiber, and controlling the group delay between modes, so as to achieve equal Design of few-mode fiber with group velocity difference.

[0033] The design method of the equal group velocity difference few-mode optical fiber of the present invention, such as figure 1 As shown, the structure of the equal group velocity difference few-mode fiber includes: a core 1 made of silicon dioxide doped with germanium dioxide, an inner cladding 2 made of silicon dioxide, and a fluoride-doped A ravi...

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Abstract

The invention discloses a design method and application of an equal-group velocity difference few-mode fiber. The structure of the equal-group velocity difference few-mode fiber comprises a core composed of silicon dioxide doped with germanium dioxide, an inner cladding layer composed of silicon dioxide, a gully layer composed of fluoride-doped silicon dioxide, and an outer cladding layer composedof silicon dioxide, which are arranged in sequence from inside out. The invention applies the equal-group velocity difference few-mode fiber to a microwave photon filter, and realizes that the groupvelocity differences between adjacent modes are equal, thereby realizing uniform time delay of the optical signal when applied in the microwave photon filter.

Description

technical field [0001] The invention relates to a design method of an optical fiber. In particular, it relates to a design method and application of a few-mode optical fiber with equal group velocity difference. Background technique [0002] Existing few-mode optical fibers used in long-distance mode-division multiplexing multiple-input multiple-output transmission systems require strong coupling between modes, so that the group delay between modes is required to be as small as possible, and ravines and air are introduced at the core-clad interface. Holes can effectively constrain the guided mode energy to exist in the fiber core, so the graded-index fiber structure with grooves[1] and the air-hole-assisted graded-index fiber structure[2] can reduce the group delay between modes. At the same time, the parabolic refractive index distribution can also realize the refractive index differential distribution of each mode in the fiber, so that the phase velocity difference of adj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B6/028
CPCG02B6/028G02B27/0012
Inventor 张欢赵健
Owner TIANJIN UNIV