Patent ID: 6870971

Claim:
An optical isolator for preventing a reverse light transmission in a forward light transmission device comprising: a first birefringent means for receiving an incident light projecting in a forward-projection direction for separating said incident light into forward-projecting separate beam components, a second birefringent means for receiving said forward-projecting separate beam components for converging said separate beam components into forward-projecting converging beam components for projecting into a third birefringent means for recombining into an output light; and said third birefringent means further receiving a reverse incident light transmitted in a reverse direction opposite said forward projecting incident light for separating said reverse incident light into reverse-projecting separate beam components to project into said second birefringent means for producing further diverged reverse-projecting beam components to project into said first birefringent means to further diverge said reverse-projecting further-diverged beam components in said first birefringent means; said second birefringent means having a birefringent optical axis for converging said forward-projecting divergent beam components and for further diverging said reverse-projecting separate beam components, and said second birefringent means further having a wedge shape with a first and second incline surfaces for receiving and projecting said forward and reverse projecting divergent beam components.