  Quantum cascade lasers are compact sources capable of generating frequency
combs. Yet key characteristics - such as optical bandwidth and power-per-mode
distribution - have to be improved for better addressing spectroscopy
applications. Group delay dispersion plays an important role in the comb
formation. In this work, we demonstrate that a dispersion compensation scheme
based on a Gires-Tournois Interferometer integrated into the QCL-comb
dramatically improves the comb operation regime, preventing the formation of
high-phase noise regimes previously observed. The continuous-wave output power
of these combs is typically $>$ 100 mW with optical spectra centered at 1330
cm$^{-1}$ (7.52 $\mu$m) with $\sim$ 70 cm$^{-1}$ of optical bandwidth. Our
findings demonstrate that QCL-combs are ideal sources for chip-based frequency
comb spectroscopy systems.
