This paper explores the potential of dissipative Kerr solitons (DKS) generated in integrated silicon nitride microresonators for massively parallel coherent optical communications. DKS are formed through four-photon interactions mediated by Kerr nonlinearity, resulting in low-noise, spectrally smooth, and broadband optical frequency combs. The authors demonstrate that these combs can be used as multi-wavelength light sources at the transmitter and as local oscillators (LOs) at the receiver, enabling high data rates and spectral efficiency in wavelength-division multiplexing (WDM) systems. Key experiments include transmitting a data stream of over 50 Tbit/s using 179 individual optical carriers across the telecommunication C and L bands, and achieving coherent detection using a pair of microresonator Kerr soliton combs. The results show that DKS combs can replace arrays of continuous-wave lasers in high-speed communications, offering significant advantages in terms of scalability, power efficiency, and signal quality. The work highlights the potential of DKS combs for chip-scale petabit/s transceivers, combining advanced spatial multiplexing schemes and highly integrated silicon photonic circuits.This paper explores the potential of dissipative Kerr solitons (DKS) generated in integrated silicon nitride microresonators for massively parallel coherent optical communications. DKS are formed through four-photon interactions mediated by Kerr nonlinearity, resulting in low-noise, spectrally smooth, and broadband optical frequency combs. The authors demonstrate that these combs can be used as multi-wavelength light sources at the transmitter and as local oscillators (LOs) at the receiver, enabling high data rates and spectral efficiency in wavelength-division multiplexing (WDM) systems. Key experiments include transmitting a data stream of over 50 Tbit/s using 179 individual optical carriers across the telecommunication C and L bands, and achieving coherent detection using a pair of microresonator Kerr soliton combs. The results show that DKS combs can replace arrays of continuous-wave lasers in high-speed communications, offering significant advantages in terms of scalability, power efficiency, and signal quality. The work highlights the potential of DKS combs for chip-scale petabit/s transceivers, combining advanced spatial multiplexing schemes and highly integrated silicon photonic circuits.