Experimental approbation of technique for writing of cascaded precision microstructured defects in silica graded index multimode optical fibers

This work presents some results of experimental approbation of method for writing of cascaded precision microstructured defects, like "tapers" and "up-tapers", in various configurations and sequences in silica multimode graded index optical fibers by commercially available field fusion splicer with modified software settings. Here we utilized earlier on developed technique for micro-defect geometry parameters estimation via analysis of photo-image, performed after defect writing and displayed on fusion splicer screen, to estimate the least available distance between couples of the "up-tapers" and "tapers" without optical fiber structure deformation. Also, some results of insertion loss measurements for various configuration of 3-element cascaded microstrucured defects are presented.