Patent ID: 9703124
Date: 2017-07-11
CPC Classifications: G02B,G02F

Claim:
1. An apparatus comprising: a birefringent crystal configured to separate an incoming light beam input at a first port into component light beams having orthogonal polarization directions and directing the component light beams on respective paths to exit locations on the birefringent crystal; and a Faraday rotator positioned between the birefringent crystal and a beam folding optic assembly, wherein the Faraday rotator is positioned such that light beams exiting the birefringent crystal along a first path from a first exit location pass through the Faraday rotator before being incident on the beam folding optic assembly and that light beams exiting the birefringent crystal along a second path from a second exit location pass directly to the beam folding optic assembly without being incident on the Faraday rotator, wherein the beam folding optic assembly folds light beams incident along the first path to the reverse of the second path and wherein the beam folding optic assembly folds light beams incident along the second path to the reverse of the first path.