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Optical frequency combs (OFCs), consisting of a set of phase locked equallyspaced laser frequency lines, have enabled a great leap in precisionspectroscopy and metrology since seminal works of H\"ansch et al. . Nowadays,OFCs are cornerstones of a wealth of further applications ranging fromchemistry and biology to astrophysics and including molecular fingerprintingand LIDARs among others. Driven passive optical resonators constitute the idealplatform for OFCs generation in terms of compactness and low energy footprint.We propose here a new technique for generation of OFCs with tuneable repetitionrate in externally driven optical resonators based on thegain-through-filtering process, a simple and elegant method, due to anasymmetric spectral filtering on one side of the pump wave. We demonstrate aproof-of-concept experimental result in a fibre resonator, pioneering a newtechnique that does not require specific engineering of the resonatordispersion to generate frequency agile OFCs.

Gain-through-filtering enables tuneable frequency comb generation in passive optical resonators