SIMULATION OF PASSIVELY MODE-LOCKED LASERS, USING NATURAL BOUNDARY-CONDITIONS - MULTI PULSE EVOLUTION AND ORDERING

We present a method for simulating a passively mode locked laser. By s electing the simulation time step as the cavity round trip time, we ac hieved a proper tracking of the temporal evolution of the individual c avity modes of the laser. Employing the split step Fourier algorithm u sing this natural modes base, an efficient simulation method was obtai ned, while retaining at each propagation step the direct physical rela tions between the calculated phase terms in the time and frequency dom ains to the actual optical field and individual cavity modes, respecti vely. Using this method, we tracked the formation of multiple pulses i n a passively mode locked fiber laser cavity, and explored the effect of delayed optical feedback as a means for pulse ordering in fiber las ers.