Optical spectral pulse shaping by combining two oppositely chirped fiber   Bragg grating
  In this letter we present a new technique for pulse shaping. The desired pulse is shaped by two apodized chirped fiber Bragg gratings which dispersions are adjusted to be cancelled. This technique exploits the well-known property of linearly-chirped gratings, in which the apodization (amplitude) grating profile maps its spectral response. This technique presents inherent advantages of chirped fiber Bragg gratings and direct design in frequency domain. 
Miguel A. Preciado, Victor Garcia-Munoz, Miguel A. Muriel