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We analyse the superluminal propagation of narrow-band pulses at resonancesin dissipative media. The output waveform is an attenuated, undistorted,time-advanced version of the input which can be interpreted as the result ofthe interference of two scaled replicas of the input having a positive relativedelay. The proposed analysis applies both to the propagation in a passive bulkmedium at an electronic resonance and in a dielectric waveguide coupled to alossy micro-ring resonator. This latter case provides a clear insight of theunderlying physical phenomena.

A common model for superluminal propagation in absorbing atomic media and lossy metastructures