Patent ID: 7702188
Filing Date: 2010-04-20
Classification: G02B

Abstract:
1. An optical structure, comprising: a polarization beam splitter comprising a first splitter waveguide having an input end and an output end, and a second splitter waveguide having an output end; a polarization rotator system comprising a first polarization rotator having an input end and an output end and a second polarization rotator having an input end and an output end; a polarization beam combiner comprising a first combiner waveguide having an input end and an output end, and a second combiner waveguide having an input end and an output end; a first optical path including the output end of the first splitter waveguide, the input end of the first polarization rotator, the output end of the first polarization rotator, and the input end of the first combiner waveguide, the first optical path being configured such that first light propagates along the first optical path from the output of the first splitter waveguide to the input end of the first combiner waveguide through the first polarization rotator; and a second optical path including the output end of the second splitter waveguide, the input end of the second polarization rotator, the output end of the second polarization rotator, and the input end of the second combiner waveguide, the second optical path being configured such that second light propagates along the second optical path from the output of the first splitter waveguide to the input end of the second combiner waveguide through the second polarization rotator, wherein the first polarization rotator is spaced from the second optical path and the second polarization rotator is spaced from the first optical path.