Design and simulation of laser diode with sampled grating structure by the split-step traveling wave approach

The traveling wave model is commonly used in the simulation of semiconductor laser diodes and photonic integrated circuits. When the laser diode is cascaded with other passive elements of relatively large optical dimension such as a sampled grating DBR section, the conventional approach by tracing the forward and the backward traveling waveform along the entire passive section in the time domain becomes extremely time consuming or even becomes impossible to be implemented. To overcome this difficulty, based on the split step approach proposed, the improved traveling wave model is applied to simulate the wavelength-tunable lasers with sampled grating DBR structures and some design issues are discussed.