Nonlinear pulse shaping-assisted ultrashort optical pulse generation

An ultrashort optical pulse generator based on nonlinear pulse shaping is proposed and demonstrated. With a spatial light modulator placed prior to a high nonlinearity fiber, \((\mu +\lambda )\)-evolution strategy is introduced to dynamically adjust the transfer function of spatial light modulator both in phase and in amplitude. Nearly chirp-free 2.2-ps optical Gaussian pulse and 0.73-ps optical Nyquist pulse with a repetition rate of 25 GHz are both achieved in simulation. The scheme also has a certain tolerance to phase quantization error of the spatial light modulator and power fluctuation.