A laser with the large optical cavity (LOC) configuration has beed designed and fabricated taking account of the various factors which have an effect on temperature characteristics of the InGaAsP-InP lasers. The experiments show that such a configuration imporves temperature stability of the laser. The devices with lower threshold current (Jth=2.5KA/cm2 for the broad-area contacts), high power (3W in pulsed operation). and high T0 (150K) have been obtained.