  Experiments and theoretical modeling yielded significant progress towards
understanding of Kerr-effect induced optical frequency comb generation in
microresonators. However, the simultaneous interaction of hundreds or thousands
of optical comb frequencies with the same number of resonator modes leads to
complicated nonlinear dynamics that are far from fully understood. An important
prerequisite for modeling the comb formation process is the knowledge of phase
and amplitude of the comb modes as well as the detuning from their respective
microresonator modes. Here, we present comprehensive measurements that fully
characterize optical microcomb states. We introduce a way of measuring
resonator dispersion and detuning of comb modes in a hot resonator while
generating an optical frequency comb. The presented phase measurements show
unpredicted comb states with discrete {\pi} and {\pi}/2 steps in the comb
phases that are not observed in conventional optical frequency combs.
