Optical fiber and method for manufacturing the same

摘要

In an optical fiber comprising a core, and a clad which has a smaller refractive index than that of the core and with which the core is covered, an tip portion of the core has the most pointed portion which is in a conical form and has the top of an acute angle of theta 1. Furthermore, the tip portion of the core has a core tip peripheral portion which is contiguous to the most pointed portion and has a slant of a gentler incline than the acute angle theta 1. The optical fiber is used for, e.g., a probe.