FIBER EQUIPPED WITH LENS

摘要

The object is to provide a lensed-fiber which ensures the improvement of the efficiency of coupling with an optical semiconductor device. In the lensed-fiber (10), one end of a single-mode fiber (11), which includes a core (11a) and a cladding (11b), and the other end of a coreless fiber (12), which has a coreless isotropic refractive index and one end thereof worked into a convex surface, are connected by a square-law index fiber (13) having a square-law index profile. <IMAGE>