Lumen Intellectual Property Services
Optical circulator
 An improved optical circulator device transfers light from a first optical fiber to a second optical fiber, and from the second fiber to a third optical fiber. The device comprises reciprocal and non-reciprocal polarization rotators, birefringent beam splitters and combiners, and a birefringent walk-off element. The invention also contains a polarization-dependent light bending device comprising two tapered birefringent plates. The light bending device compensates for an angle between a first light beam emanating from the first fiber and a second light beam exiting through the third fiber. The existence of this angle allows the first and third fibers to be coupled to the light beams using a single lens. 
U.S.A Kaifa Technology, Inc.
G G G G
G02F G02B G02B G02F
inventional inventional inventional inventional
Vincent Qing-Dong Wei-Zhong
Au-Yeung Guo Li