INFLUENCE OF ASYMMETRIC NONLINEAR GAIN ON THE TRANSIENT INTENSITIES OF LONGITUDINAL MODES IN LONG-WAVELENGTH FABRY-PEROT LASER-DIODES

The intensity transients of the longitudinal modes in a modulated 1.3- mu m Fabry-Perot laser diode are analyzed theoretically and experiment ally. A simulation of the transient spectra, based on a 21-mode rate-e quation model, shows that nonlinear gain strongly affects the intensit ies of longitudinal modes during transients. The simulation results ar e confirmed by time-resolved spectrum measurements, From a comparison of measurements and the simulations, the self- and cross-saturation co efficients are estimated, Our simulations also show that the transient spectrum strongly depends on the bit interval during digital modulati on.