Silicon photonic integrated carrier-extracted self-coherent receiver

To overcome the fiber chromatic dispersion (CD)-induced power fading in intensity modulation direct detection (IM/DD), self-coherent detection is an advanced DD solution enabling optical field recovery without local oscillators (LOs) for CD compensation. For cost-efficient and high-performance short-reach links, we propose carrier-extracted self-coherent (CESC) detection, which derives the LO from the incoming signal by employing a narrowband coupled-resonator optical waveguide (CROW) filter. Thus, the signal-to-signal beat interference (SSBI) could be effectively suppressed, enabling complex-valued double-sideband signal retrieval with linear equalization only. In this work, we demonstrate, to our knowledge, the first silicon photonic integrated CESC receiver, achieving 303.8-Gb/s data rate over 50-km standard single-mode fiber using a 62-Gbaud PCS-64QAM signal at a low carrier-to-signal power ratio (CSPR) of 0 dB with only linear equalizers, which is promising for short-reach links in datacenters and access networks.