Optical fiber collimator and manufacturing method thereof

摘要

An optical fiber collimator is provided in which the optical axis of a beam of light incident upon and emergent from the end face of the optical fiber collimator utilizing graded index (GI) optical fiber is made to perfectly agree with the axial direction of the optical fiber and further the optical fiber collimator is capable of obtaining a return loss characteristic. The optical fiber collimator comprises: a single mode (SM) optical fiber and GI optical fiber fused to an end face of SM optical fiber so that an optical axis of SM optical fiber is coincide with an optical axis of GI optical fiber to effect an optical transmission between these fibers; and GI optical fiber having a second end face provided with a bulge portion defining a smooth outer surface symmetrical with respect to the common optical axis of SM and GI optical fibers.