Silicon-photonics-based coherent optical subassembly (COSA) for ultra-compact coherent transceiver

We actualized a silicon photonics (SiPh)-based coherent optical subassembly (COSA) with a compact and low-height package for the next-generation transceiver form factors. We integrated optical functions required for transmitting and receiving digital coherent optical signals into a single SiPh chip. The COSA is applicable to 100-Gbps dual-polarization quadrature phase shift keying and 200Gbps dual polarization 16-quadrature amplitude modulation transmissions.