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Using a ceramic thermoelectric heater, we show highly reproduciblefabrication of single-mode sub-wavelength silica tapers with ultra-low losslevel. The reproducibility of the process is studied statistically, leading toan average taper transmission of 94%. The best tapers have a transmissionsuperior to 99%, above common level reached by other fabrication methods. Thetaper profile is inspected along its length and closely follows the exponentialprofile predicted by the model of Birks and Li. This high degree of controlover the taper shape allows a detailed analysis of the transition to thesingle-mode regime during tapering. As an application of this fabricationmethod, we present a micro-looped taper probe for evanescent couplingexperiments requiring fine spatial selectivity.

Ultra-low loss single-mode silica tapers manufactured by a microheater