| 摘要 |
A compact non-reciprocal optical waveguide-circulating device is disclosed. Three optical waveguides (8a,b,c) are disposed along side one another at an input end adjacent a thin birefringent crystal (10) to which they are optically coupled. The circulating device also includes at a distal end, a mirror (20) for reflecting light backwards and providing a folded configuration. The device is capable of accepting a non-collimated beam of light that is launched from the input end through the birefringent crystal (10) and rotating elements (12a,b,c,d,14). By providing end faces at one end of the waveguides that are mode field expanded, light is effectively coupled between the waveguides and the adjacent crystal. A grin lens (18) is disposed between a Faraday rotator (14) ane the mirror (20). |
