OPTICAL FIBER COLLIMATOR USING GRADIENT INDEX ROD LENS

摘要

An optical fiber collimator using a gradient index rod lens for securing a required long opposing distance and easy handling. The collimator includes a single made fiber and a gradient index rod lens for receiving an incident light from the single mode fiber and converting the incident light into a collimated light, or condensing an incident light and coupling the condensed incident light to the single mode fiber. A meandering period (pitch) of a ray determined by a refractive index distribution of the rod lens is decided. The gradient index rod lens has a lens length larger by 0.5 meandering periods than a minimum lens length required to obtain a predetermined opposing distance between a pair of the rod lenses.