ANALYTICAL AND NUMERICAL EVALUATION OF TRANSMISSION CHARACTERISTICS OF CHIRPED DFB LASERS IN DISPERSIVE OPTICAL FIBERS

Analytical and numerical results are presented for the propagation of optical pubes of 1.5 mu m DFB lasers in the presence of fiber dispersi on. An approximate analytical model for the evolution of the pulse is given and shown to provide reasonable agreement with the numerical res ults obtained for digital transmission at 3.0 Gb/s, Comparison with pu lse broadening and compression of Gaussian pulses is given, showing th at our model, which fits the initial pulse to an asymmetrical function , describes the numerical results better. The utility of the model is for fiber dispersion compensation. Although the examples analyzed are not of practical interest, they show the benefit of the theory with re spect to the Gaussian model, since it is able to predict numerical res ults.