Patent ID: 7023618

Claim:
An optical isolator comprising: a first stage configured to refract a light ray applied in a forward direction into a first ray and a second ray, the first stage having a first core including a first birefringent wedge with a first optic axis, and the first core also including a second birefringent wedge with a second optic axis that is different from the first optic axis; and a second stage mechanically rotated about 90° with respect to said first stage and configured to refract said first and second rays in a substantially parallel manner, the second stage having a second core including a third birefringent wedge with a third optic axis that is rotated about 45° with respect to the optic axis of the first birefringent wedge, and the second core also including a fourth birefringent wedge with a fourth axis that is rotated about 45° with respect to the optic axis of the second birefringent wedge.