OPTICAL TRANSMISSION LINE

摘要

PROBLEM TO BE SOLVED: To provide a low-cost optical transmission line having a simple and compact structure for connecting optical transmission lines with different core cross sections to each other with a low loss and without needing accurate alignment. SOLUTION: In this optical transmission line 4 having a core 1 being an optical transmission medium for propagating light and a clad 2 arranged around the core 1 along the light propagation direction of the core 1 and being a low refractive index medium having a refractive index lower than that of the core 1 and making end faces with different cross sections of the core 1 to be an input terminal and an output terminal, the cross section of the core of a face perpendicular to the propagation direction of the light is continuously and moderately reduced or increased. COPYRIGHT: (C)2003,JPO