Phase mask automatic switching device

Abstract

An automatic phase mask plate switching device used for writing a grating through a phase mask plate writing method is composed of a phase mask plate rotary switching clamp, a stepping motor, a drive circuit and a control system. By means of the automatic phase mask plate switching device, the operation of writing the fiber grating is greatly simplified, the fiber grating can be automatically written, and the quality and repeatability of grating writing can be improved.

Description

technical field [0001] The invention relates to an optical fiber grating, in particular to an automatic switching device for a phase mask for writing a grating by a phase mask writing method. Background technique [0002] With the wide application of fiber Bragg grating in the fields of coherent optical communication, sensing and fiber laser, the demand for fiber Bragg grating is also increasing. Therefore, the automatic control of fiber Bragg grating writing is conducive to the mass production of fiber Bragg grating. Current methods of writing fiber gratings include the following: [0003] Standing wave interferometry was used in the early days. Its device is relatively simple, requiring a high content of germanium, a small core diameter, and the reflection wavelength of the grating is only determined by the wavelength of the writing light. The conditions for forming the grating are harsh, and the yield is low. It meets the practical requirements and is rarely used. [00...

AI Technical Summary

Problems solved by technology

[0008] Usually, when writing a grating, every time the phase mask is changed, the phase mask must be manually placed on a fixed fixture. It should be noted that the grooved surface of the phase mask is close to the side of the optical fiber, and the relative position of the phase plate and the optical fiber is difficult to control. Accurate, if the distance from the optical fiber is too close, the phase plate may be damaged, if it is too far, the speed of writing the grating is too slow, and it must be positioned accurately

Moreover, when writing a fiber grating, the optical fiber must be perpendicular to the reticle of the phase mask, otherwise it will affect the quality of the written grating

Images