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Micro-combs [1 - 4], optical frequency combs generated by integratedmicro-cavity resonators, offer the full potential of their bulk counterparts[5,6], but in an integrated footprint. The discovery of temporal soliton states(DKS dissipative Kerr solitons) [4,7-11] as a means of modelocking microcombshas enabled breakthroughs in many fields including spectroscopy [12,13],microwave photonics [14], frequency synthesis [15], optical ranging [16,17],quantum sources [18,19], metrology [20,21] and more. One of their mostpromising applications has been optical fibre communications where they haveenabled massively parallel ultrahigh capacity multiplexed data transmission[22,23]. Here, by using a new and powerful class of microcomb called solitoncrystals [11], we achieve unprecedented data transmission over standard opticalfibre using a single integrated chip source. We demonstrate a line rate of 44.2Terabits per second using the telecommunications C band at 1550nm with aspectral efficiency, a critically important performance metric, of 10.4bits/s/Hz. Soliton crystals exhibit robust and stable generation and operationas well as a high intrinsic efficiency that, together with a low solitonmicrocomb spacing of 48.9 GHz enable the use of a very high coherent datamodulation format of 64 QAM (quadrature amplitude modulated). We demonstrateerror free transmission over 75 km of standard optical fibre in the laboratoryas well as in a field trial over an installed metropolitan optical fibrenetwork. These experiments were greatly aided by the ability of the solitoncrystals to operate without stabilization or feedback control. This workdemonstrates the capability of optical soliton crystal microcombs to perform indemanding and practical optical communications networks.

Optical data transmission at 44Tb/s and 10 bits/s/Hz over the C-band with standard fibre and a single micro-comb source