Fiber core auto-tracing method, system, and storage medium for fabricating fiber grating

A fiber core auto-tracing system for laser fabrication of fiber gratings, comprising:

• an image sensor, a three-dimensional translation stage, and a controller;
• wherein:
• the image sensor is configured for real-time acquisition of an image of an optical fiber to be processed on the three-dimensional translation stage;
• the three-dimensional translation stage being parallel to an X axis and a Y axis, and perpendicular to a Z axis, the X-axis, the Y-axis and the Z-axis forming a three-dimensional coordinates system, wherein the optical fiber includes a fiber core and cladding and is to be processed using a laser with a laser focus at an XY coordinate;
• the three-dimensional translation stage is configured for adjusting the three-dimensional coordinate position of the optical fiber in the three-dimensional coordinate system according to a control command from the controller;
• the controller is configured for:
• controlling the three-dimensional translation stage to adjust the relative position of the optical fiber and the microscope objective in the Z-axis direction until two boundary lines between the fiber core and the cladding are identified in the acquired image;
• calculating the position of the center point between the two boundary lines on the three-dimensional translation stage;
• and controlling the three-dimensional translation stage to adjust the position of the optical fiber on the three-dimensional translation stage, according to the position of the center point, until an XY coordinate of the center point coincides with the XY coordinate of the laser focus.