Spectrally Efficient Integrated Silicon Photonic Phase-Diverse DD Receiver with Near-Ideal Phase Response for C-Band DWDM Transmission

In this paper, a spectrally efficient silicon photonics phase-diverse direct-detection receiver based on asymmetric self-coherent detection is proposed. The receiver is hardware efficient and composed of only two photodiodes and two analog-to-digital channels to accurately recover complex double-sideband signals by leveraging an optimized integrated silicon racetrack resonator with near-ideal phase responses. Moreover, the periodicity of the resonator response enables the receiver to support multi-channel transmission such as dense wavelength-division multiplexing. The receiver circuit is fabricated and characterized. In 40-km transmission experiments, a record net electrical spectral efficiency of 7.10 bit s-1 Hz-1 per wavelength and per polarization is achieved, where a net 208-Gb s-1 32QAM transmission is demonstrated using 29.3-GHz electrical bandwidth. Furthermore, the receiver achieves net 220-Gb s-1 16QAM transmissions in 14 channels from 1527 to 1550 nm with 205-GHz spacing, and a maximum 240-Gb s-1 net capacity at a single channel. Such a performance is reached with only standard coherent digital signal processing stacks including all-linear equalization. A simple yet highly efficient integrated silicon photonics phase-diverse direct-detection receiver based on asymmetric self-coherent detection is demonstrated. The receiver is shown to support net 208-Gb s-1 32QAM transmission with 29.3 GHz electrical bandwidth, resulting in a record electrical spectral efficiency of 7.10 bit s-1 Hz-1 per wavelength and per polarization.image