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The demand for high-speed and highly efficient optical communicationtechniques has been rapidly growing due to the ever-increasing volume of datatraffic. As well as the digital coherent communication used for core and metronetworks, intensity modulation and direct detection (IM-DD) are still promisingschemes in intra/inter data centers thanks to their low latency, highreliability, and good cost performance. In this work, we study amicroresonator-based frequency comb as a potential light source for futureIM-DD optical systems where applications may include replacing individualstabilized lasers with a continuous laser driven microresonator. Regarding combline powers and spectral intervals, we compare a modulation instability comband a soliton microcomb and provide a quantitative analysis with regard totelecom applications. Our experimental demonstration achieved a forward errorcorrection (FEC) free operation of bit-error rate (BER) <10^(-9) with a 1.45Tbps capacity using a total of 145 lines over the entire C-band and revealedthe possibility of soliton microcomb-based ultra-dense wavelength divisionmultiplexing (WDM) with a simple, cost-effective IM-DD scheme, with a view tofuture practical use in data centers.

Dissipative Kerr soliton microcombs for FEC-free optical communications over 100 channels