LARGE-SIGNAL AND SMALL-SIGNAL DYNAMIC BEHAVIOR OF HIGH-SPEED DUAL-POLARIZATION QUANTUM-WELL SEMICONDUCTOR-LASERS

In this paper, the transmission-line laser model is modified to model both transverse-electric (TE) and transverse-magnetic (TM) modes so th at it is applicable to quantum-well (QW) dual-polarization lasers and polarization-insensitive semiconductor optical amplifiers (SOA's), The effects of carrier transport are also included in the model, The resu lting dual-polarization transmission-line laser model is used to study large- and small-signal dynamic behavior of dual-polarization lasers, We find from large-signal simulations that the polarization asymmetry (ratio of the transverse-modal powers) varies on a nanosecond time sc ale in dual-polarization single-quantum-well (SQW) devices, We show th at unequal transverse-modal differential gains and gain nonlinearities are responsible for this temporal polarization asymmetry, In addition , our numerical simulations show that the steady-state polarization as ymmetry is a strong function of the gain nonlinearity, Small-signal dy namic simulations show that the modulation response of the polarizatio n-unresolved output of dual-polarization SQW lasers follows that of th e transverse mode with the lowest gain nonlinearity coefficient, regar dless of the transverse-modal differential gains.