The single and coupled photonic crystal nanocavity lasers are fabricated in the InGaAsP material system and their static and dynamic features are compared.The coupled-cavity lasers show a larger lasing efficiency and generate an output power higher than the single-cavity lasers,results that are consistent with the theoretical results obtained by rate equations.In dynamic regime,the single-cavity lasers produce pulses as short as 113ps,while the coupled-cavity lasers show a significantly longer lasing duration.These results indicate that the photonic crystal laser is a promising candidate for the light source in high-speed photonic integrated circuit.