GRIN LENSED OPTICAL DEVICE

摘要

An optical device is disclosed wherein a first GRIN lens and a second GRIN l ens having their optical axes offset. The first GRIN lens has one or more input ports a t an input end. The second GRIN lens is disposed to receive light from the first GRIN lens. A reflecting surface is coated onto a second end face of the second GRIN lens or alternat ively is disposed adjacent to the second end face and positioned to reflect an input beam of l ight launched into the input end face of the first GRIN lens. The reflective surface is at a lo cation where light incident upon it to be returned to the first GRIN lens is collimated. By pl acing a filter and third GRIN lens between the first and second lenses double filtering may be achieved at the pass band or pass wavelength of the filter. Furthermore, the more simple arr angement including only first and second lenses provides a means of directing light i nto and out of the device at different angles or directions with respect to the optical axis of the first lens.