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Photonic crystal fiber and design method for generating multiple orbital angular momentum modes

A technology of photonic crystal fiber and orbital angular momentum, which is applied in the direction of multi-layer core/cladding fiber, cladding fiber, optical waveguide light guide, etc., can solve the problem of small number of transmissions, avoid mutual coupling and control transmission characteristics Effect

Active Publication Date: 2020-11-17
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a photonic crystal fiber that produces multiple orbital angular momentum modes, so as to solve the problem that the existing optical fiber supports a small number of OAM mode transmissions

Method used

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  • Photonic crystal fiber and design method for generating multiple orbital angular momentum modes
  • Photonic crystal fiber and design method for generating multiple orbital angular momentum modes
  • Photonic crystal fiber and design method for generating multiple orbital angular momentum modes

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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] The present invention produces a kind of photonic crystal fiber of various orbital angular momentum modes, such as figure 1 As shown, the cross section of the photonic crystal fiber is circular, including the core layer 1 and the annular cladding arranged outwards from the center of the circle, the core layer 1 is a circular air hole, and the annular cladding has four layers and is concentric A circle, from the center of the circle to the outside is cladding one 2, cladding two 3, cladding three 4 and cladding four 5; said cladding one 2 and cladding two 3 are all made up of rectangular air holes, and said cladding Three 4 and cladding four 5 both consist of circular air holes.

[0061] The radius of the circular air holes of the core layer 1 is 7.5 μm.

[0062] The number of rectangular air holes in cladding one 2 is 40, the length ...

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Abstract

The invention discloses a photonic crystal fiber producing multiple orbital angular momentum modes. The photonic crystal fiber comprises fiber core layers and annular claddings which are successivelyarranged from the center of a circle to the outside world. The fiber core layers are circular air holes, and the annular claddings are four layers and are concentric circles, and comprise a cladding 1, a cladding 2, a cladding 3 and a cladding 4 from the center of the circle to the outside world. The cladding 1 and the cladding 2 are formed by rectangular air holes. The cladding 3 and the cladding4 are formed by circular air holes. The photonic crystal fiber is used to generate a vortex light beam so as to produce a plurality of OAM modes, mutual coupling and degeneracy between vector eigenmodes in the photonic crystal fiber are avoided, and a transmission characteristic of vortex light is effectively controlled. An existing fiber supports the OAM modes and a transmission number is small.By using the photonic crystal fiber of the invention, the above problems are solved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a photonic crystal fiber that generates multiple orbital angular momentum modes, and also relates to a design method of the photonic crystal fiber. Background technique [0002] The vortex beam is a new type of beam with a helical phase wavefront, and its intensity distribution is circular. There is a helical phase term exp(ilθ) in the complex amplitude expression of the light field, and each photon carries The orbital angular momentum (Orbital AngularMomentum, OAM). Theoretically, the vortex beam has an infinite number of eigenstates, and they are all orthogonal to each other. It can be used as an independent channel. Based on this characteristic, the different orthogonal modes of the vortex light can carry independent data streams and realize multi-channel information. transmission. Two or more vortex beams carrying different OAMs are combined into one mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036G02B27/00
CPCG02B6/02328G02B6/02347G02B6/036G02B27/0012
Inventor 柯熙政王沙沙
Owner XIAN UNIV OF TECH
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