Method for making optical fiber spherical-surface micro lens in three steps of corrosion, cutting and hot melting

Abstract

The invention relates to a method for making an optical fiber spherical-surface micro lens in three steps of corrosion, cutting and hot melting, which comprises the following steps of: (1) corrosion: corroding the end parts of an optical fiber by using acid liquor to diminish the diameters of outer layers on the end parts of the optical fiber and forming a conical surface transition shape at a non-corrosion part; (2) flat end surface cutting: cutting off small-diameter parts formed on the end parts of the optical fiber so that the ends of the optical fiber is of a regular circular truncated cone shape after the cutting; and (3) formation of the optical fiber spherical-surface micro lens by utilizing electrodes for hot melting on the ends of the optical fiber, wherein the corrosion time in the step (1) is the ratio of the difference of the radius b of the covered outer side of the non-corroded optical fiber and the curvature radius of the optical fiber spherical-surface micro lens formed in the step (3) to the corroding speed v of the optical fiber. Compared with the prior art, the method has the advantages of convenience, accurate size and artificial control on the curvature radius of the spherical-surface micro lens.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber spherical lens, in particular to a method for manufacturing an optical fiber spherical micro lens in three steps of etching, cutting and heat melting. Background technique [0002] The efficient coupling of semiconductor laser (LD) to single-mode fiber has always been an important research content in the field of optical fiber communication. Using ordinary flat-end fiber to directly couple with LD, the loss reaches 7dB, there are two ways to improve the fiber coupling efficiency, one is to add discrete optical components between the LD and the fiber, the other is to use fiber micro-lens coupling, because the fiber micro Lens-coupled systems are characterized by small size, simple structure, easy processing and integration, and low cost, and have been extensively studied in recent years. [0003] The processing methods of fiber optic microlenses mainly include grinding and polishing, ...

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Problems solved by technology

[0004] At present, the processing of optical fiber spherical microlenses by corrosion melting method mostly depends on experiments, and there is no quantitative calculation model. Therefore, the radius of curvature of the manufactured optical fiber spherical microlenses cannot be controlled, and the size error is large, which also affects the coupling effect.

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