Patent ID: 6826212
Filing Date: 2004-11-30
Classification: B82Y,H01S

Abstract:
A module for optical communication having a modulator integrated laser includes a semiconductor laser active region and an optical modulation region for modulating the light from the semiconductor laser active region; and a temperature control region for controlling temperature of at least the optical modulation region, said semiconductor laser active region having a multiple-quantum well structure having at least two quaternary mixed compound crystal layers in which a band offset of a conduction band is larger than a band offset of a valence electron band, said at least two quaternary mixed compound crystal layers being selected from the group consisting of quaternary mixed compounds of In, Ga, Al and As and of quaternary mixed compounds of In, Ga, N and As, wherein a temperature of a semiconductor laser active region or a temperature of a component in thermal contact with the semiconductor laser active region for holding the temperature of the semiconductor laser active region is set to 35Â° C. or higher during operation of the semiconductor laser active region and the optical modulation region.