  Frequency comb absorption spectroscopy combined with low-noise, fast homodyne
measurements provide a toolbox for ultra-sensitive absorption measurements.
Integrating these schemes on photonic platforms to bring them closer to
practical applications is challenging. Here, we propose a scheme that can be
readily adapted on a photonic platform. We show that each frequency comb tooth
can independently sampled, the span of the comb can be tailored, and that our
method does not require a careful alignment of the comb centre with any
absorption profiles. This allows an asymmetric absorption profile to be
reconstructed in full without requiring additional components.
