Abstract
To minimize coupling losses when low-cost connectors are used to mate optical fibers, manufacturers need to maintain tight control of fiber dimensions. The video-microscope, or gray-scale, method is the most frequently used technique on the manufacturing floor for measuring the geometric parameters of the cleaved end of a telecommunications fiber. We present a method for performing optical-fiber dimensional quality control that allows for end face damage and accounts for the special structure of measurement errors in fiber edge points calculated from gray-scale images. The new approach adheres to the industrial standard test procedure by fitting an ellipse to the edge table to obtain geometric measurements. But, to create high-breakdown resistance to outliers, a data filter based on the least median of squares criterion is used.
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