Biconical Optical Fiber Fabrication

A biconical fiber was obtained by locally heating by using a butane burner a single-mode optical fiber to the melting point (~ 1700 °) and followed by mechanical pulling. Photos of the biconical fiber were obtained using a scanning electron microscope. A diameter of fiber is about 3 microns in the constriction, which makes it possible to excite whispering gallery modes high quality resonators.