Ultra-low-loss tapered optical fibers with minimal lengths

Abstract

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

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• Ultra-low-loss nanofiber Fabry-Pérot cavities optimized for cavity quantum electrodynamics
• Non-destructive profilometry of optical nanofibres
• Hybrid device for quantum nanophotonics
• High-performance, adiabatically nanotapered fibre-chip couplers in silicon at 2 microns wavelength