High-birefringence optical fiber and preparation method thereof

Abstract

The invention discloses a high-birefringence optical fiber and a preparation method thereof. The high-birefringence optical fiber comprises an optical fiber main body, wherein a fiber core is arrangedin the center of the optical fiber main body, the optical fiber main body is provided with a plane part, an open type vent hole is formed in the side, which is located on the plane part, of the optical fiber main body, and an air hole is formed in the optical fiber main body. According to the invention, the open type vent hole not only can accelerate the filling rate and response time of fluid, but also can avoid high-energy scattering in a grating writing process; due to the removal of part of an outer cladding, the open structure has a focusing effect on incident laser, so that more scattering is avoided, the fiber core is enabled to gather energy of more light beams, and the writing efficiency of the grating is improved; and in the open photonic crystal fiber structure, the fluid can quickly enter through the side surface, and real-time distributed sensing can be formed on the basis of the structure.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a high birefringence optical fiber and a preparation method thereof. Background technique [0002] In the past, the research on photonic crystal fluid sensing was mainly devoted to optimizing the structure of optical fiber and demodulation technology to improve the sensitivity. However, in practical applications, since the air holes are very small and the fiber length is long, it takes a long time for the fluid to fill the air holes in the cladding even under the conditions of vacuum / pressure and fluid diffusion. For example, it takes more than 4 hours to fill half a meter of photonic crystal fiber with isopropanol (liquid), and it takes about 200 minutes to fill one meter of photonic crystal fiber with acetylene (gas). Therefore, the traditional photonic crystal fiber structure cannot realize real-time sensing, such as Figure 6 It is a schematic diagram of the scatterin...

AI Technical Summary

Problems solved by technology

Therefore, the traditional photonic crystal fiber structure cannot realize real-time sensing, such as Image 6 Schematic diagram of beam scattering for laser writing process of traditional closed photonic crystal grating

At the same time, during the UV laser writing process of photonic crystal gratings, the air holes in the fiber cladding will inhibit the writing efficiency of the gratings

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