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Dynamic characteristics of directly modulated laser are investigated by simulating the single mode laser rate equations, emphasized on the effect of the gain compression for the two laser models: one adiabatic chirp dominated and another with a combination of adiabatic and transient chirp-dominated laser. The influence of laser adiabatic and transient chirp on system performance in normal and anomalous propagation regime is investigated by simulation. It is shown that in the anomalous propagation regime, the presence of fiber nonlinearity can be beneficial, improving the system performance by opening the eye diagram at system output. Contrarily, in the normal propagation regime, presence of high gain compression coefficient (ε &gt; 4 × 10 –17  cm 3 ) can strongly degrade the system performance by closing the eye diagram at system output. Finally, it is shown that the laser model with a combination of adiabatic and transient chirp with anomalous dispersion coefficient shows much better result in the saturated regime. This can be used to extend the transmission distance in optical communication.

Investigation on Chirping induced performance degradation in Single Mode Directly modulated 1.55um DFB laser