Patent ID: 9459406
Filing Date: 2016-10-04
CPC Classification: G01J,G02B

Claim Text:
1. A polarization beam splitter comprising: a demultiplexer that is formed of a rib waveguide and demultiplexes input light into first input light and second input light; a multiplexer that is formed of a rib waveguide and multiplexes the first input light and the second input light, the first input light and the second input light being obtained by demultiplexing the input light by the demultiplexer; a first arm waveguide that guides the first input light to the multiplexer, at least a part of the first arm waveguide being formed of a channel waveguide; and a second arm waveguide that generates a phase difference in the second input light with respect to the first input light propagating through the first arm waveguide, and guides the second input light to the multiplexer, at least a part of the second arm waveguide being formed of a channel waveguide, wherein the channel waveguide and the channel waveguide are silicon waveguides each including a core layer formed by a silicon film, and wherein a part of the first arm waveguide that is formed of the channel waveguide and a part of the second arm waveguide that is formed of the channel waveguide have a linear shape.