Based on the tapering theory of moving flame,we analyze the parameters of a commercial taper machine and fabricate some tapered fiber samples with different shapes.To test the coherence of the shape of fabricated tapered fibers and the theoretical analysis,we establish a Fourier diffraction testing system and measure the shapes of these tapered fiber samples.The testing results prove the rationality of this theoretical analytic method.A method is proposed to obtain tapering fibers with special-designed shap...