Retrieving the Complex Intracavity Pump Field of a Kerr Comb from the   Through Port Data
  A method of retrieving the complex intracavity pump field from the through port is proposed, and verified through characterizing the time-domain waveform of a mode-locked comb related to dark soliton formation in a normal-dispersion microresonator. 
Xiaoxiao Xue, Yi Xuan, Yang Liu, Pei-Hsun Wang, Steven Chen, Jian   Wang, Dan E. Leaird, Minghao Qi, and Andrew M. Weiner
physics.optics