Method for automatically forwardly/reversely tapering fiber

Abstract

The invention provides a method for automatically forwardly / reversely tapering a fiber. According to the method, the external envelope of a flame in a fiber heating area in the tapering process is calculated according to the shape of a target fiber, and reciprocating of a flame front is controlled, so that a tapered fiber conforming to a target shape is prepared. Post-treatment of a fiber waveguide is realized by constant-speed reciprocating heating of the dotted flame and simultaneous stretch or compression of two ends of the fiber, and the movement speed of the dotted flame front and the stretch / compression speed of the two ends of the fiber can be optionally adjusted in the forward / reverse tapering process. The linear dispersion characteristic and the nonlinear Kerr characteristic of the tapered fiber can be greatly changed. The tapered fiber can be efficiently and laterally coupled with an external environment. The properties are quite widely applied to fiber optics and a plurality of fields including fiber sensing, optical frequency conversion, super-continuum broadening, quantum optics and the like.

Description

technical field [0001] The invention relates to post-processing of silica optical fiber, in particular to positive / reverse tapering treatment of microstructured silica optical fiber including photonic crystal optical fiber. Background technique [0002] The application of fiber optics technology requires a wide range of controllable adjustments to the linear dispersion properties and nonlinear Kerr properties of optical waveguides, which can be used for long-distance and low-loss transmission. Chromatic dispersion, especially chromatic dispersion, refers to the different effective refractive indices of the same waveguide in different colors of light. In silica fibers, the waveguide dispersion can be greatly tuned by changing the diameter of the fiber. By drawing the fiber diameter from 10 micron to 1 micron, the zero dispersion wavelength of the waveguide is shifted from 1120nm to 540nm. On the other hand, the nonlinear Kerr coefficient of the fiber waveguide is also close...

AI Technical Summary

Problems solved by technology

This approach cannot meet the above-mentioned requirements for precise control of fiber shape over a long distance, which greatly limits the range of options for post-processing of fibers

However, the existing optical fiber tapering technology based on the idea of ​​reverse engineering is only aimed at the positive tapering process, that is, the fiber diameter continues to narrow from both ends to the center. see discussion

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