The invention discloses an SOI-based
broadband adjustable
beam splitting ratio polarization rotary
beam splitter, which comprises a
waveguide layer, a thermode, a buffer layer, an input end and an output end, wherein the
waveguide layer comprises three sections of tapering
ridge waveguides, an S-shaped bent
ridge waveguide, a straight waveguide, an Archimedes spiral bent
ridge waveguide, a straight ridge waveguide and an output ridge waveguide, the waveguide layer is prepared from an SOI material, the thermode and the buffer layer are sequentially arranged above the waveguide layer, the thermode is prepared from a
TiN material, and the temperature of the thermode can be changed by applying a
voltage across the thermode. According to the invention, polarization rotation,
beam splitting andbeam splitting ratio adjustment of an input optical
signal can be realized, and the
beam splitter can be applied to a polarization
multiplexing system, a coherent light communication
system,
optical logic gate design and the like, and has the advantages of low
insertion loss, simple process, strong
reconfigurability, wide working bandwidth and the like.