High birefringence large non-linear photonic crystal fiber

A photonic crystal fiber, high birefringence technology, applied in cladding fiber, optical waveguide light guide, light guide, etc., can solve the problems of limitations, small nonlinear coefficient of quartz materials, and difficulty in miniaturization and integration of high nonlinear devices

Active Publication Date: 2018-03-27
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the working wavelength (less than 3 μm) of the traditional photonic crystal fiber made of quartz material limits its application in the mid-infrared and fa

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  • High birefringence large non-linear photonic crystal fiber
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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Here, the exemplary embodiments and description of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0023] Reference figure 1 To Figure 6, the present invention discloses a photonic crystal fiber with high birefringence and large nonlinearity. The optical fiber is composed of a first elliptical air hole 8 and a second elliptical air hole 5 with a hexagonal lattice elliptical air hole array structure that works at 3 μm. ~5μm high birefringence and large nonlinear photonic crystal fiber in the mid-infrared range, including a core 2 and a cladding on the fiber background material 1. The cladding is composed of two first ellipses with the same long axis and different short axis The six-layer hexagonal lattice elliptical air hole array composed of air holes 8 and second elliptical air ...

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Abstract

The invention provides a high birefringence large non-linear photonic crystal fiber. The high birefringence large non-linear photonic crystal fiber having a hexagonal crystal lattice oval air hole array structure composed of first oval air holes and second oval air holes and working in an intermediate infrared range from 3 [mu]m to 5 [mu]m includes a fiber core and a cladding disposed on an optical fiber background material. The cladding has six-layer hexagonal crystal lattice oval air hole arrays composed of first oval air holes and second oval air holes having identical long axis and different short axes. The second oval air holes are distributed along the y axis while the first oval air holes are distributed along the x axis. The fiber core is arranged in the solid area of the center position of the optical fiber background material. High birefringence of the optical fiber as high as 0.1177 is acquired in a wavelength range from 3 [mu]m to 5 [mu]m and the corresponding beat-length is 42.4 [mu]m. The nonlinear coefficient of the optical fiber in the x polarization direction and the y polarization direction is 38390w-1km-1 and 49760w-1km-1.

Description

Technical field [0001] The present invention relates to the technical field of mid-infrared optical fiber communication and optical fiber sensing, in particular to a high birefringence and large nonlinear photonic crystal fiber operating in the mid-infrared range of 3 μm to 5 μm. Background technique [0002] The fundamental mode transmitted in a single-mode fiber is composed of two degenerate orthogonal polarization modes. Under ideal conditions (the fiber is cylindrically symmetric and unstressed), these two orthogonal polarization modes are completely coupled . For actual optical fibers, due to the influence of gravity and internal residual stress during the drawing process, the shape of the core changes randomly along the length of the optical fiber, and the optical fiber no longer exhibits ideal cylindrical symmetry. As a result, the degenerate mode is destroyed. The two orthogonal polarization states have different propagation constants, which in turn causes the effective ...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02347
Inventor 惠战强张友坤
Owner XIAN UNIV OF POSTS & TELECOMM
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