Carbon dioxide laser fabrication of fused-fiber couplers and tapers

Abstract

We report the development of a fiber taper and fused-fiber coupler fabrication rig that uses a scanning, focused, CO₂ laser beam as the heat source. As a result of the pointlike heat source and the versatility associated with scanning, tapers of any transition shape and uniform taper waist can be produced. Tapers with both a linear shape and an exponential transition shape were measured. The taper waist uniformity was measured and shown to be better than ±1.2%. The rig was also used to make fused-fiber couplers. Couplers with excess loss below -0.1 dB were routinely produced.

© 1999 Optical Society of America

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