Abstract: A polarization control device and a polarization control method, wherein the polarization control device includes a polarization beam splitting apparatus, a first phase shifter, a beam combiner, a first waveguide, a second waveguide, and a third waveguide, where the polarization beam splitting apparatus is configured to split input light into two beams of transverse electric (TE) mode light or two beams of transverse magnetic (TM) mode light, where the first phase shifter is configured to adjust a phase of light that is input to the first phase shifter, and the beam combiner is configured to adjust a split ratio of the beam combiner, and combine the two beams of TE mode light or the two beams of TM mode light that is input from a first input port and a second input port of the beam combiner, into one beam of TE mode light or one beam of TM mode light.

Abstract: The present disclosure discloses an on-chip optical network system, which includes a light source, an optical waveguide, a controller, an optical power divider, and a modulator; a lightwave emitted from the light source is transmitted to the optical power divider using the optical waveguide; the optical power divider is configured to obtain a lightwave, and transmit the obtained lightwave to the modulator; the controller is configured to calculate first optical power, and control the optical power divider to obtain a lightwave whose optical power is the first optical power; and the first optical power is a sum of optical power required by the modulator and a first optical power loss generated during lightwave transmission between the optical power divider and the modulator. The system implements allocation of optical power on demand; therefore, cases of excessive optical power obtained by the modulator are reduced.