A method for forming an optical fiber assembly includes splicing a first fiber and a second fiber together. The first fiber is one of a single mode optical fiber or a multi-mode optical fiber and the second fiber is a coreless silica fiber. The method further includes heating the second fiber, and applying a tensile force to the second fiber during heating of the second fiber. The method further includes discontinuing application of the tensile force when a minimum neck thickness of the second fiber is below a neck thickness threshold. The method further includes discontinuing heating after discontinuing application of the tensile force and after the second fiber has separated into a tip portion and a detached portion, the tip portion connected to the first fiber.