US 12,411,370 B2
High extinction-ratio optical rotator
Denglian Lu, Fuzhou (CN); Xingduan Huang, Fuzhou (CN); Shi Chen, Fuzhou (CN); Guanglei Ding, Fuzhou (CN); and Shaofeng Zhang, Fuzhou (CN)
Assigned to Fujian Hitronics Technologies, Inc., Fuzhou (CN)
Filed by Fujian Hitronics Technologies, Inc., Fuzhou (CN)
Filed on Mar. 30, 2023, as Appl. No. 18/192,962.
Prior Publication US 2023/0359071 A1, Nov. 9, 2023
Int. Cl. G02F 1/01 (2006.01); G02F 1/09 (2006.01)
CPC G02F 1/093 (2013.01) [G02F 1/0136 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A high extinction-ratio optical rotator, comprising:
a collimator configured to collimate a signal light from an optical fiber;
a pair of polarizing splitting prisms, comprising:
a first birefringent crystal wedge; and
a second birefringent crystal wedge,
wherein the first birefringent crystal wedge has a first optical axis parallel to a vertical plane, wherein the second birefringent crystal wedge has a second optical axis perpendicular to the vertical plane,
wherein the signal light output from the collimator passes through the pair of polarizing splitting prisms, wherein the polarizing splitting prism is configured to separate two orthogonal polarization components of the signal light into a vertically polarized light and a horizontally polarized light;
a non-reciprocal 45-degree polarization rotator,
wherein the vertically polarized light and the horizontally polarized light exiting the pair of polarizing splitting prisms pass through the non-reciprocal 45-degree polarization rotator in a forward transmission direction; and
a reflector,
wherein the vertically polarized light and the horizontally polarized light exiting the non-reciprocal 45-degree polarization rotator intersect on a surface of the reflector, wherein the reflector is configured to reflect the signal light exiting the non-reciprocal 45-degree polarization rotator back into the non-reciprocal 45-degree polarization rotator in a backward transmission direction.