Patent ID: 8837869

Claim:
An SOA-PLC hybrid integrated polarization diversity circuit comprising a PLC-PBS chip and a semiconductor optical amplifier-chip on submount (SOA-COS) whose respective waveguides are coupled to each other, wherein the PLC-PBS chip comprises: a first optical waveguide and a second optical waveguide; a Mach-Zehnder interferometer circuit configured to divide inputted light into TM mode light and TE mode light and to output the divided TM mode light to the first optical waveguide and the divided TE mode light to the second optical waveguide; and a polarization rotation mechanism built in the first optical waveguide by which the TM mode light is converted to the TE mode light and the TE mode light is converted to the TM mode light, the SOA-COS comprises: a third optical waveguide connected to the first optical waveguide; a fourth optical waveguide connected to the second optical waveguide; and an SOA formed in at least one of the third and fourth optical waveguides, and one end of the third optical waveguide and one end of the fourth optical waveguide are connected to a U-turn optical waveguide, the one ends being not connected to the first optical waveguide and the second optical waveguide, respectively.