Originally developed for metrology, optical frequency combs are becoming increasingly pervasive in a wider range of research topics including optical communications, spectroscopy, and radio or microwave signal processing. However, application demands in these ﬁelds can be more challenging as they require compact sources with a high tolerance to temperature variations that are capable of delivering ﬂat comb spectra, high power per tone, narrow linewidth and high optical signal-to-noise ratio (OSNR). To date, there has not been a frequency comb technology that is able to simultaneously achieve all these requirements. This work reports the generation of a ﬂat, high power frequency comb in the telecom band using a 17-mm fully-integrated silicon core ﬁbre (SCF) as a parametric mixer. Our all-ﬁbre, cavity-free source combines the materials beneﬁts of planar waveguide structures with the advantageous properties of ﬁbre platforms to achieve a 30 nm bandwidth comb source containing 143 tones with <3 kHz linewidth, 12 dB ﬂatness, and >30 dB OSNR over the entire spectral region. The unique combination of technical features oﬀered by this SCF-based source opens a path towards a new class of high-performance frequency comb generators for communications and signal processing applications.