Integrated coherent optical transceiver

An integrated circuit comprising:

• a silicon photonics substrate comprising a silicon-based material and comprising silicon photonics components formed in the silicon photonics substrate, the silicon photonics components configured to receive and transmit optical signals, the silicon photonics substrate comprising electrical connections;
• a transimpedance amplifier chip arranged on the silicon photonics substrate, the transimpedance amplifier chip comprising a silicon-germanium material that is different from the silicon-based material of the silicon photonics substrate, the transimpedance amplifier chip connected via the electrical connections in the silicon photonics substrate to at least one of the silicon photonics components configured to receive an optical signal, the transimpedance amplifier chip configured to process a received optical signal and output a processed signal to a digital signal processor;
• and
• a driver chip arranged on the silicon photonics substrate, the driver chip comprising CMOS material that is different from the silicon-germanium material of the transimpedance amplifier chip and from the silicon-based material of the silicon photonics substrate, the driver chip connected via the electrical connections in the silicon photonics substrate to drive at least one of the silicon photonics components configured to generate a coherent optical signal for transmission;
• a laser device arranged on the silicon photonics substrate wherein the laser device is configured to output light;
• a splitter configured to split the light from the laser device into a first portion and a second portion;
• a polarization beam splitter rotator configured to split TE-mode and TM-mode of the received optical signal and rotate the TM-mode to TE-mode;
• a receiver configured to receive outputs of the polarization beam splitter rotator, receive the first portion of the light from the laser device, and detect TE-mode and TM-mode signals of the received optical signal, wherein the detected TE-mode and TM-mode signals of the received optical signal are output to the transimpedance amplifier chip;
• and
• a transmitter configured to receive the second portion of the light from the laser device and to generate the coherent optical signal for transmission.