CONNECTION STRUCTURE FOR LENS-ATTACHED OPTICAL FIBERS AND METHOD FOR SETTING RADIUS OF CURVATURE OF END SURFACE OF LENS-ATTACHED OPTICAL FIBER

摘要

According to the present invention, provided is a connection structure for lensed optical fibers, which is configured to establish PC connection of lensed optical fibers (1) each including an optical fiber (2) and a GRIN lens (3) that has a rod-like shape and is coaxially fused to a tip of the optical fiber, wherein each of the lensed optical fibers (1) includes an end surface (31) subjected to spherical polishing, and wherein the end surface (31) has a curvature radius (R) satisfying conditions expressed by the following relations (1) and (2): and where W represents a beam diameter, "a" represents a radius of a contact surface, F represents a pressing force at the time of PC connection, "v" represents a Poisson's ratio of the GRIN lens, and E represents a Young's modulus of the GRIN lens.