Photonic integrated circuit chip

A photonic integrated circuit chip, having an empty area, wherein the photonic integrated circuit chip comprises:

• a grating coupler array, configured to receive a light beam;
• an optical modulator module, coupled to the grating coupler array, and configured to modulate the light beam from the grating coupler array such that light of a specific wavelength in the light beam is output from the grating coupler array;
• a plurality of optical waveguides, wherein the optical modulator module is coupled to the grating coupler array through the optical waveguides;
• a plurality of heaters, electrically connected to the optical modulator module;
• and
• a plurality of bonding pads, electrically connected to the optical modulator module and the heaters,
• wherein the grating coupler array, the optical modulator module, the optical waveguides, the heaters, and the bonding pads are disposed around the empty area,
• wherein the optical modulator module comprises a first photodetector array, an optical modulator array, and a second photodetector array,
• wherein the light beam comprises a first light beam and a second light beam, the first light beam is transmitted to the first photodetector array, the second light beam is transmitted to the optical modulator array, the optical modulator array receives and modulates the second light beam to generate a third light beam, the third light beam comprises a fourth light beam and a fifth light beam, the fourth light beam is transmitted to the second photodetector array, and the fifth light beam is transmitted to the grating coupler array,
• wherein the heaters are disposed in the optical modulator array,
• wherein the bonding pads are configured to be electrically connected to a controller such that the controller obtains a light intensity of the first light beam and a light intensity of the fourth light beam, and the controller controls a temperature of the optical modulator array through the heaters according to a ratio between the light intensity of the fourth light beam and the light intensity of the first light beam to adjust a light intensity of the third light beam.