Gaussian-shaped Optical Frequency Comb Generation for Microwave Photonic   Filtering
  Using only electro-optic modulators, we generate a 41-line 10-GHz Gaussian-shaped optical frequency comb. We use this comb to demonstrate apodized microwave photonic filters with greater than 43-dB sidelobe suppression without the need for a pulse shaper. 
Rui Wu, Christopher M. Long, Ehsan Hamidi, V. R. Supradeepa, Min Hyup   Song, Daniel E. Leaird, and Andrew M. Weiner
physics.optics