Abstract

Tapering of single-mode optical fibers has attracted much attention, since high-quality and low-cost fiber devices can be made in this manner. Optical fiber coaxial couplers¹ have the waveguides, I.e., the core and secondary cladding coupled coaxially. Due to dissimilar geometry, phase matching does not always naturally occur, but it can be achieved with tapering. The coupling effects observed¹ can be used for fabricating narrow passband filters.²

© 1987 Optical Society of America