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We design and fabricate ultra-low-loss tapered optical fibers (TOFs) withminimal lengths. We first optimize variations of the torch scan length usingthe flame-brush method for fabricating TOFs with taper angles that satisfy theadiabaticity criteria. We accordingly fabricate TOFs with optimal shapes andcompare their transmission to TOFs with a constant taper angle and TOFs with anexponential shape. The highest transmission measured for TOFs with an optimalshape is in excess of 99.7 % with a total TOF length of only 23 mm, whereasTOFs with a constant taper angle of 2 mrad reach 99.6 % transmission for a 63mm TOF length.

Ultra-low-loss tapered optical fibers with minimal lengths