Long wavelength lasers with very fine structures and their applications to photonic integrated circuits

With aiming at realization of extremely low power consumption active devices for optical interconnections and photonic integrated circuits (PICs), we have been exploring GaInAsP/InP long wavelength lasers consisting of high index-contrast gratings by low-damage fabrication processes. Moreover, active photonic devices based on high index-contrast waveguides, so called ‘Semiconductor Membrane Lasers,’ have been investigated from their advantage of an enhancement of the optical confinement factor of the active region.